WO2018181241A1 - 鉄含有ルチル型酸化チタン微粒子分散液の製造方法、鉄含有ルチル型酸化チタン微粒子およびその用途 - Google Patents
鉄含有ルチル型酸化チタン微粒子分散液の製造方法、鉄含有ルチル型酸化チタン微粒子およびその用途 Download PDFInfo
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Definitions
- the present invention relates to a method for producing a titanium oxide fine particle dispersion, and more particularly to a method for producing a titanium oxide fine particle dispersion that is preferably used as a material for a coating liquid for forming a coating film on a plastic substrate.
- titanium oxide fine particles have a high refractive index, they are suitably used as a material for a coating solution for forming a coating film on an optical substrate such as a plastic lens.
- rutile-type crystalline titanium oxide particles have lower photocatalytic activity than anatase-type fine particles, so the adhesion between the substrate and the coating film is degraded by decomposing the organic silicon compound or resin component of the film-forming component. Can be suppressed.
- Patent Document 2 in order to provide a coating liquid for forming a hard coat film having a high refractive index and excellent transparency, weather resistance, and adhesion to a substrate, a titanium oxide component is added to the coating liquid for film formation.
- an iron oxide component contains composite oxide fine particles having a Fe 2 O 3 / TiO 2 (weight ratio) in the range of 0.0005 or more and less than 0.005. Obtained by using anatase-type titanium oxide and iron oxide composite oxide particles obtained by preparing composite oxide particles of titanium oxide and iron oxide by the production method disclosed in Patent Document 2 as a coating liquid for coating film formation.
- the resulting film is excellent in weather resistance because the photocatalytic activity of the composite oxide fine particles is suppressed.
- Patent Document 3 discloses core-shell type fine particles in which rutile-type titanium oxide fine particles are used as cores and are coated with a composite oxide composed of oxides of silicon and zirconium and / or aluminum. Since the photocatalytic activity of the rutile-type titanium oxide fine particles is suppressed by adopting such a configuration, a film obtained using the core-shell fine particles as a coating liquid for forming a coating film is excellent in weather resistance.
- an object of the present invention is to provide titanium oxide-based fine particles having excellent transparency, a dispersion thereof, a production method thereof, and the like while maintaining a high refractive index.
- the present inventors have intensively studied and found that the above-mentioned problems can be solved by making the titanium oxide fine particles into rutile-type titanium oxide fine particles slightly containing iron, thereby completing the present invention.
- the gist of the present invention is as follows.
- step (3) is oxidized with Si and at least one metal element (M) selected from the group consisting of Al, Zr, Sb, Zn, Ni, Ba, Mg, and V.
- M metal element
- Silica-based fine particle sol containing the mass of SiO 2 / MO x / 2 (x is the valence of M) 99.9 / 0.1 to 80/20 in terms of the mass of the product
- a method for producing an iron-containing rutile type titanium oxide fine particle dispersion comprising a step of hydrothermally treating the solution obtained in step (4) to obtain an iron-containing rutile type titanium oxide fine particle dispersion.
- (B) The ratio of Fe and Ti is the mass of Fe 2 O 3 / (total mass of TiO 2 and Fe 2 O 3 ) 0.001 to 0.010 in terms of the mass of the oxide.
- (C) The ratio of Ti and Sn is TiO 2 mass / SnO 2 mass 6 to 18 in terms of oxide mass.
- the average particle size is 4 to 25 nm.
- the iron-containing rutile-type titanium oxide fine particles of [3] are coated with a layer made of an oxide and / or a composite oxide containing Si and containing at least one metal element selected from the group consisting of Al, Zr and Sb. Core-shell type iron-containing rutile type titanium oxide fine particles.
- a coating composition comprising the core-shell type iron-containing rutile type titanium oxide fine particles of [4] and a matrix component.
- titanium oxide fine particles of the present invention compared to conventional titanium oxide fine particles, photocatalytic activity is suppressed while maintaining a high refractive index, and the titanium oxide fine particles have excellent transparency, and the fine particles are used as core particles.
- Core-shell type fine particles and dispersions thereof, a coating composition containing the fine particles, a production method thereof, and the like can be provided.
- a substrate with a coating film provided with a hard coat layer having a high refractive index and a suppressed photocatalytic activity or an ultraviolet shielding coating layer from the coating composition.
- FIG. 1 is an SEM image of the titanium oxide fine particles 1A obtained in Example 1.
- FIG. 2 is an SEM image of the titanium oxide fine particles 21A obtained in Comparative Example 11.
- the method for producing an iron-containing rutile-type titanium oxide fine particle dispersion according to the present invention includes the following steps (1) to (5).
- Step (1) is an aqueous solution of a metal mineral salt, and Ti and Fe as the metal are converted into the mass of the oxide by the mass of Fe 2 O 3 / (total of TiO 2 and Fe 2 O 3 . Mass) (hereinafter also referred to as “Fe 2 O 3 / (TiO 2 + Fe 2 O 3 )”) Neutralizing an aqueous solution containing 0.001 to 0.010 to obtain iron-containing hydrous titanic acid It is a process.
- the aqueous solution is, for example, a method of mixing a titanium mineral salt, an iron mineral salt and water, a method of mixing a titanium mineral salt and an iron mineral salt (however, one of the mineral salts) Or both may be in the form of an aqueous solution).
- the mineral salt of titanium is not particularly limited, and examples thereof include titanium sulfate, titanium nitrate, titanium tetrachloride, titanyl sulfate, and titanyl chloride.
- the iron mineral acid salt is not particularly limited, and examples thereof include ferric chloride, ferrous sulfate, and ferric nitrate.
- Fe 2 O 3 / (TiO 2 + Fe 2 O 3 ) is 0.001 to 0.010 (ie 0.1 to 1.0% by mass), more preferably 0.003 to 0.0085 (ie 0. 3 to 0.85 mass%).
- this ratio (Fe 2 O 3 / (TiO 2 + Fe 2 O 3 )) is less than 0.001, the photocatalytic activity of the iron-containing rutile titanium oxide fine particles cannot be sufficiently suppressed, and this ratio (Fe 2 When O 3 / (TiO 2 + Fe 2 O 3 )) is greater than 0.01, the iron-containing rutile titanium oxide fine particles are yellowish, and the film containing the iron-containing rutile titanium oxide fine particles is also yellowish. End up.
- Examples of the method for neutralizing the aqueous solution of the metal mineral salt include a method of bringing the aqueous solution of the metal mineral salt into contact with a basic substance.
- An example of the basic substance is ammonia.
- the basic substance may be used in the form of an aqueous solution (for example, aqueous ammonia).
- a slurry of iron-containing hydrous titanic acid is obtained.
- An example of a method for separating the iron-containing hydrous titanic acid from the iron-containing hydrous titanic acid slurry is a method of filtering the iron-containing hydrous titanic acid slurry.
- the iron-containing hydrated titanic acid is a hydrated solid content obtained by neutralizing an aqueous solution of the metal mineral salt, and is a component containing hydrated titanic acid as a main component and a small amount of iron.
- the iron-containing hydrous titanic acid is preferably washed with pure water or the like.
- Step (2) is a step of adding aqueous hydrogen peroxide to the iron-containing hydrous titanic acid obtained in step (1) to obtain an aqueous solution of iron-containing peroxytitanic acid having an average particle size of 15 to 50 nm. .
- step (2) after adding hydrogen peroxide water to the iron-containing hydrous titanic acid, stirring is preferably performed at a temperature of 70 to 90 ° C.
- the stirring time is preferably 0.5 to 5 hours.
- the iron-containing hydrous titanic acid is peptized and the average particle size of the iron-containing titanate in the iron-containing titanate aqueous solution can be controlled in the range of 15 to 50 nm. it can.
- grains of iron-containing titanic acid acid are disperse
- iron-containing titanate is a component that contains titanate as a main component and contains a small amount of iron, and it is estimated that a part of the titanium that constitutes titanate is replaced with iron.
- heating to 70 to 90 ° C. is started immediately after adding the hydrogen peroxide solution to the iron-containing hydrous titanic acid, that is, within 2 hours, preferably within 1 hour. If the heating to 70 to 90 ° C. is immediately performed in this manner, the particle diameter of the iron-containing titanic acid titanate can be reduced.
- the average particle diameter of the defatted iron-containing peroxytitanic acid measured by the method employed in the examples described later or a method equivalent thereto is 15 to 50 nm, preferably 30 to 45 nm.
- the iron-containing rutile titanium oxide fine particles finally obtained by controlling the average particle size of the peptized iron-containing titanate within the above range particles having an average particle size of 4 to 25 nm can be produced.
- the fine particle dispersion having high transparency can be obtained stably.
- the average particle diameter of the iron-containing titanate is less than 15 nm, the dispersion stability of the iron-containing titanate in an aqueous solution is low, so that the finally obtained iron-containing rutile titanium oxide fine particles are coarse. Particles may be present and thus the transparency of the dispersion may be reduced.
- the average particle size is larger than 50 nm, the particle size of the iron-containing rutile titanium oxide fine particles is increased, so that the transparency of the dispersion may be lowered.
- the iron-containing peroxytitanic acid aqueous solution is prepared so that the titanium concentration is preferably 5% by mass or less, more preferably 2% by mass or less in terms of TiO 2 .
- the titanium concentration concentration in terms of TiO 2
- the iron-containing titanic acid peroxide particles are difficult to aggregate, and as a result, the average particle size of the iron-containing rutile titanium oxide fine particles can be reduced.
- Step (3) is a tin compound to iron-containing aqueous solution of peroxide titanate obtained in step (2), the ratio of Ti in said the Sn aqueous solution, of the TiO 2 in terms of mass of oxide
- the tin compound is not particularly limited, and examples thereof include potassium stannate, tin nitrate, and tin chloride.
- the method for removing contaminating ions is not particularly limited, and examples thereof include a method using an ion exchange resin or an outer membrane.
- Step (4) at least one metal element (M) selected from the group consisting of Si and Al, Zr, Sb, Zn, Ni, Ba, Mg, and V is added to the solution obtained in step (3).
- M metal element
- preparative where x is the valence of M.
- the silica-based fine particle sol can be produced by a known method, for example, a method described in JP-A No. 63-123807 or JP-A No. 2009-197078.
- the finally obtained iron-containing rutile-type titanium oxide fine particle dispersion has excellent dispersion stability without precipitation or precipitation. Thus, aggregation of fine particles and generation of coarse particles can be prevented, and the particle size and particle size distribution of the fine particles in the dispersion can be controlled.
- the silica-based fine particle sol is not added, the final particle size of the iron-containing rutile-type titanium oxide fine particle dispersion cannot be controlled, and the dispersion stability is poor. Further, when a sol of silica fine particles not containing the metal element M is added in place of the silica-based fine particle sol, coarse particles and aggregated particles are generated in the finally obtained iron-containing rutile titanium oxide fine particle dispersion. There is a case.
- SiO 2 / MO x / 2 is 99.9 / 0.1 to 80/20, preferably 99.9 / 0.1 to 82/18.
- SiO 2 / MO x / 2 in the silica-based fine particles is larger than 99.9 / 0.1, the dispersion stability of the iron-containing titanate particles in an aqueous solution tends to be inferior, and SiO 2 / MO x /
- SiO 2 / MO x / When 2 is less than 80.0 / 20.0, the solubility of the iron-containing titanate particles containing silica-based fine particles in the aqueous solution tends to decrease during hydrothermal treatment.
- Said x is the valence of the metal element M.
- the valences of Al, Zr, Sb, Zn, Ni, Ba, Mg and V are respectively III, IV, III, II, II, II, II. And V.
- SiO 2 / TiO 2 + SnO 2 + Fe 2 O 3 + SiO 2 + MO x / 2
- SiO 2 / exceeds 22% by mass, it is difficult to dissolve silica-based fine particles during hydrothermal treatment, and the effect of adding a sol of silica-based fine particles cannot be obtained sufficiently. There is a tendency.
- the specific surface area of the silica-based fine particles is preferably 100 to 600 m 2 / g, more preferably 200 to 550 m 2 / g, and further preferably 300 to 550 m 2 / g.
- the specific surface area of the silica-based fine particles is within this range, the above-described effect of adding the sol of the silica-based fine particles can be sufficiently obtained.
- Step (5) is a step in which the solution obtained in step (4) is hydrothermally treated to obtain an iron-containing rutile-type titanium oxide fine particle dispersion.
- the conditions for producing a conventional titanium oxide fine particle dispersion by hydrothermal treatment can be appropriately applied, the temperature is preferably 100 to 300 ° C., and the time is preferably 5 to 40 hours.
- the dispersion is obtained in the form of an aqueous dispersion.
- the iron-containing rutile-type titanium oxide fine particle dispersion obtained by the production method of the present invention may be appropriately concentrated and used by a known method such as vacuum distillation or ultrafiltration depending on the application.
- the iron-containing rutile-type titanium oxide fine particle dispersion may be any of an aqueous dispersion, water and an organic solvent, or an organic solvent dispersion.
- a dispersion containing an organic solvent in the dispersion medium can be produced, for example, by replacing part or all of the water contained in the aqueous dispersion with an organic solvent by a rotary evaporator, an ultrafiltration membrane or other known methods. Examples of the organic solvent will be described later.
- the iron-containing rutile-type titanium oxide fine particles according to the present invention are iron-containing rutile-type titanium oxide fine particles that satisfy the following requirements (a) to (f).
- the average particle size measured by the method employed in the examples described later or a method equivalent thereto is 4 to 25 nm, preferably 12 to 25 nm.
- “Iron-containing rutile-type titanium oxide fine particles” contain a metal element other than titanium (iron, tin, the above-mentioned metal element M) and silicon while being confirmed to have a rutile-type titanium oxide crystal structure by XRD measurement or the like It is a fine particle. It is considered that a part of the titanium site of the rutile type titanium oxide is replaced by all or part of the metal element other than titanium and silicon.
- the iron-containing rutile-type titanium oxide fine particles have suppressed photocatalytic activity while maintaining a high refractive index as compared with conventional titanium oxide fine particles.
- the iron-containing rutile type titanium oxide fine particles have high shape uniformity.
- the high uniformity of the shape of the fine particles can be confirmed by observing the fine particles with a scanning electron microscope (SEM). For this reason, the iron-containing rutile titanium oxide fine particles are excellent in transparency.
- Fe 2 O 3 / (TiO 2 + Fe 2 O 3 ) is 0.001 to 0.010 (that is, 0.1 to 1.0 mass%), preferably 0.003 to 0.0085 (that is, 0.3). To 0.85 mass%).
- Fe 2 O 3 / (TiO 2 + Fe 2 O 3 ) is less than 0.001, the photocatalytic activity of the iron-containing rutile titanium oxide fine particles cannot be sufficiently suppressed, and Fe 2 O 3 / (TiO 2 + Fe When 2 O 3 ) is greater than 0.01, the iron-containing rutile titanium oxide fine particles are yellowish, and the film containing the iron-containing rutile titanium oxide fine particles is also yellowish.
- the core-shell type iron-containing rutile type titanium oxide fine particles according to the present invention comprise at least one metal element selected from the group consisting of Al, Zr, and Sb, wherein the iron-containing rutile type titanium oxide fine particles according to the present invention contain Si.
- Core-shell type iron-containing rutile type titanium oxide fine particles coated with a layer (hereinafter also referred to as “coating layer”) composed of an oxide and / or a composite oxide.
- the coating layer can further reduce the photoactivity of the iron-containing rutile titanium oxide fine particles that are the core particles.
- the coating layer can be formed by, for example, a method described in JP2009-15596A.
- the aqueous dispersion of iron-containing rutile-type titanium oxide fine particles according to the present invention contains Si at a temperature of 80 ° C. to 95 ° C., and at least one selected from the group consisting of Al, Zr and Sb.
- the resulting dispersion is further subjected to water.
- an aqueous dispersion of the core-shell type iron-containing rutile type titanium oxide fine particles coated with the coating layer is obtained.
- the amount of the coating layer of the core-shell type iron-containing rutile type titanium oxide fine particles is preferably 0.5 to 50 parts by mass with respect to 100 parts by mass of the iron-containing rutile type titanium oxide fine particles as the core particles. This amount can be adjusted by the amount of raw material for iron-containing rutile type titanium oxide fine particles and coating layer.
- the core shell type iron-containing rutile type titanium oxide fine particle dispersion may be any of an aqueous dispersion, water and an organic solvent, or an organic solvent dispersion.
- the dispersion containing the organic solvent in the dispersion medium for example, part or all of the water contained in the dispersion can be replaced with the organic solvent by a rotary evaporator, an ultrafiltration membrane, or other known methods.
- Examples of the organic solvent that can be used for the iron-containing rutile-type titanium oxide fine particle dispersion and the core-shell type iron-containing rutile-type titanium oxide fine particle dispersion include: Alcohols such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, octanol; Esters such as ethyl acetate, butyl acetate, ethyl lactate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ⁇ -butyrolactone; Ethers such as diethyl ether, ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), ethylene glycol monobutyl ether (butyl cellosolve), diethylene glycol monomethyl ether, diethylene glycol monoethyl ether; Ketones such as acetone
- the step of performing the hydrophobization treatment is a step of adding a surface treatment agent to the dispersion, and further performing heating or hydrothermal treatment as necessary.
- a surface treatment agent to the dispersion
- further performing heating or hydrothermal treatment as necessary.
- solvent replacement operation May be performed before or after the solvent replacement operation.
- a catalyst such as ammonia may be used as necessary.
- the surface treatment agent examples include alkoxide compounds such as tetraethoxysilane and triisopropoxyaluminum, coupling agents such as a silane coupling agent and a titanium coupling agent, and non-molecular or cationic or anionic low-molecular or high-molecular compounds.
- alkoxide compounds such as tetraethoxysilane and triisopropoxyaluminum
- coupling agents such as a silane coupling agent and a titanium coupling agent
- non-molecular or cationic or anionic low-molecular or high-molecular compounds such as surfactants, metal soap salts such as fatty acid metal salts or metal salts of naphthenic acid can be used.
- a conventionally known method is used as appropriate. The method can be used.
- the coating composition according to the present invention is a coating composition including the core-shell type iron-containing rutile titanium oxide fine particles according to the present invention and a matrix component.
- the coating composition may further contain a curing catalyst or additive.
- the coating composition may be a thermosetting coating composition or a photocurable coating composition.
- thermosetting coating composition contains core-shell type iron-containing rutile-type titanium oxide fine particles, a matrix component, and a curing catalyst or additive for thermosetting as necessary, and by mixing these components, for example, it can be produced based on the description in JP-A-2000-204301.
- the photocurable coating composition contains core-shell type iron-containing rutile titanium oxide fine particles, a matrix component, and a photocurable curing catalyst or additive as necessary, and these components are mixed.
- core-shell type iron-containing rutile titanium oxide fine particles a matrix component
- a photocurable curing catalyst or additive as necessary, and these components are mixed.
- it can be manufactured based on the description in JP-A-2009-56387.
- the matrix component examples include methyltrimethoxysilane, ethyltriethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, dimethyldimethoxysilane, phenylmethyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris ( ⁇ -Methoxyethoxy) silane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -glycidoxypropylmethyldimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane, ⁇ - ( 3,4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -methacryloxypropyltrimethoxysilane, N- ⁇ (aminoethyl) ⁇ -aminopropyltrimethoxy
- thermosetting curing catalyst examples include amines such as n-butylamine, triethylamine, guanidine and biguanide, amino acids such as glycine, aluminum acetylacetonate, chromium acetylacetonate, titanylacetylacetonate, cobalt acetylacetonate.
- amines such as n-butylamine, triethylamine, guanidine and biguanide
- amino acids such as glycine, aluminum acetylacetonate, chromium acetylacetonate, titanylacetylacetonate, cobalt acetylacetonate.
- Metal salts of organic acids such as metal acetylacetonate, sodium acetate, zinc naphthenate, cobalt naphthenate, zinc octylate, tin octylate, perchlorates such as perchloric acid, ammonium perchlorate, magnesium perchlorate
- perchlorates such as perchloric acid, ammonium perchlorate, magnesium perchlorate
- acids or salts thereof acids such as hydrochloric acid, phosphoric acid, nitric acid, and paratoluenesulfonic acid, or metal chlorides that are Lewis acids such as SnCl 2 , AlCl 3 , FeCl 3 , TiCl 4 , ZnCl 2 , and SbCl 3. . These may be used alone or in combination of two or more.
- photocuring curing catalyst examples include bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2-hydroxy-methyl-2-methyl-phenyl-propane-1-ketone, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone and 2-methyl-1 -[4- (methylthio) phenyl] -2-morpholinopropan-1-one. These may be used alone or in combination of two or more.
- the additive examples include surfactants, leveling agents, ultraviolet absorbers, light stabilizers, dilution solvents, antiseptics, antifouling agents, antibacterial agents, antifoaming agents, ultraviolet deterioration preventing agents, and dyes. It is done. These may be used alone or in combination of two or more.
- the base material with a coating film according to the present invention is a base material with a coating film having a base material and a coating film formed from the coating composition according to the present invention provided on the surface of the base material.
- the substrate examples include various substrates made of glass, plastic, and the like, and specific examples include a plastic substrate used as an optical lens or the like.
- the film thickness of the coating film is preferably 0.03 to 30 ⁇ m, although it varies depending on the use of the substrate with the coating film.
- the substrate with a coating film according to the present invention can be produced, for example, based on the description in JP-A-2000-204301 when the thermosetting coating composition is used, and the photocurable coating composition In the case of using a product, it can be produced, for example, based on the description in JP-A-2009-56387, and a thermosetting coating composition or a photocurable coating composition can be prepared by dipping, spraying, or spinnering. It can be produced by applying to a substrate by a known method such as a roll coating method or a bar coater method, drying, and curing by heat treatment or ultraviolet irradiation.
- the surface of the substrate is treated with an alkali, acid or surfactant in advance for the purpose of improving the adhesion between the substrate, for example, a plastic substrate and the coating film. Polishing treatment with inorganic or organic fine particles, primer treatment or plasma treatment may be performed.
- Measurement method and measurement method Measurement methods and evaluation methods in Examples and the like will be described below.
- Average particle diameter ((iron-containing) titanate peroxide, inorganic oxide fine particles)
- Each particle was diluted with a dispersion medium so that the solid content concentration was 3% by weight, and the particle size distribution was measured using a fine particle size measuring device (ELS-Z, manufactured by Otsuka Electronics Co., Ltd.) by a dynamic light scattering method. .
- the refractive index and viscosity of each dispersion medium were used as the refractive index and viscosity of the solution.
- the average particle size was determined by cumulant analysis.
- the nitrogen adsorption amount was measured by the nitrogen adsorption method (BET method) using a specific surface area measuring device (manufactured by Yuasa Ionics, model number Multisorb 12), and the specific surface area by the BET one-point method was calculated from the adsorption amount. . Specifically, 0.5 g of a sample is taken in a measurement cell, degassed for 20 minutes at 300 ° C. in a mixed gas stream of nitrogen 30 vol% / helium 70 vol%, and then the sample is placed in the mixed gas stream. The liquid nitrogen temperature was maintained, and nitrogen was adsorbed on the sample by equilibrium.
- BET method nitrogen adsorption method
- the sample temperature is gradually raised to room temperature while flowing the above mixed gas, the amount of nitrogen desorbed in the meantime is detected, and the specific surface area (m 2) of silica fine particles or silica-based fine particles is determined using a calibration curve prepared in advance. / G) was calculated.
- [5] Particle composition (titanium, tin and silicon) An aqueous dispersion of inorganic oxide fine particles was collected in zirconia balls, and after removing moisture by infrared irradiation, the resulting dried product was heated with Na 2 O 2 and NaOH and melted. To the obtained melt, hydrochloric acid was further added, and pure water was added for dilution. Using an ICP device (ICPS-8100, manufactured by Shimadzu Corporation), the amounts of titanium, tin and silicon in the obtained solution were measured according to oxide conversion standards (TiO 2 , SnO 2 , SiO 2 ).
- zirconium, aluminum An aqueous dispersion of inorganic oxide fine particles was collected in a platinum dish, hydrofluoric acid and sulfuric acid were added and heated, and hydrochloric acid was added to dissolve the oxide particles. Furthermore, after diluting this with pure water, the amount of zirconium and aluminum was measured with an oxide conversion standard (ZrO 2 , Al 2 O 3 ) using an ICP apparatus (manufactured by Shimadzu Corporation, ICPS-8100). .
- [7] Particle Shape The shape of the inorganic oxide fine particles was observed with a scanning electron microscope (SEM) (S-5500, manufactured by Hitachi High-Technologies Corporation) at an acceleration voltage of 30 kV.
- SEM scanning electron microscope
- the sample for observation was produced as follows. A water-dispersed sol of inorganic oxide fine particles is diluted with water to a solid content concentration of 0.05%, and then applied to a metal grid with collodion film (Oken Shoji Co., Ltd.) and irradiated with a 250 W lamp for 30 minutes to scatter the solvent. A sample for observation was prepared.
- UV lamp manufactured by AS ONE
- a distance of 5.5 cm with respect to the surface of the quartz cell having a width of 1 cm and a height of 5 cm is used. From the distance, ultraviolet rays were irradiated for 3 hours at an intensity of 0.4 mW / cm 2 (converted to a wavelength of 365 nm).
- the sample was measured for absorbance (A 0 ) before ultraviolet irradiation at a wavelength of 490 nm and absorbance (A 3 ) after ultraviolet irradiation with an ultraviolet-visible light spectrophotometer (manufactured by JASCO, V-550).
- thermosetting coating film The surface of the coating film of the base material with the thermosetting coating film was subjected to 100 parallel meshes by making 11 parallel scratches with a knife at intervals of 1 mm in each direction. Next, using a xenon weather meter (manufactured by Suga Test Instruments Co., Ltd., SX-75, UV irradiation intensity 60 W / m 2 , test condition is JIS-K7350-2) for the substrate with thermosetting coating film After performing the acceleration test, the cellophane tape was adhered to the cell, and then the cellophane tape was peeled off to confirm whether the cell was peeled off. If there is no peeling of the cells, repeat the accelerated exposure test, then adhere the cellophane tape to the cells, then peel the cellophane tape repeatedly, and the total UV irradiation time until one or more cells peel Asked.
- a xenon weather meter manufactured by Suga Test Instruments Co., Ltd., SX-75, UV ir
- Adhesiveness ⁇ 100 remaining meshes ⁇ : 99 to 30 remaining cells ⁇ : 29 to 0 remaining cells Appearance of coating film ⁇ : No cracks ⁇ : Cracks The area is less than 30% with respect to the total area of the coating film.
- This aqueous iron-containing titanate solution is transparent yellowish brown with a pH of 8.5, and the particle size of the particles in the aqueous solution (described as “particle size of titanate titanate” in Table 1-1) is 35 nm. there were.
- silica having a specific surface area containing 0.4 wt% of aluminum was 375m 2 / g in terms of Al 2 O 3 fine particles (That is, also referred to as “silica-based sol 1”, hereinafter referred to as “silica-based sol 1”, pH 2.2, solid concentration 16 wt%, manufactured by JGC Catalysts & Chemicals Co., Ltd.) 1.125 kg and pure water 18.0 kg mixed And it heated at the temperature of 165 degreeC for 18 hours in the autoclave (The pressure
- the fine particles contained in the water-dispersed sol thus obtained were iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 1A”) having a rutile crystal structure and containing tin and silicon.
- the content of the metal (including silicon, the same applies hereinafter) component in the inorganic oxide fine particles 1A is 74.4% by weight of TiO 2 , 9.4% by weight of SnO 2 , and SiO 2 in terms of oxide. It was 14.3% by weight, K 2 O was 1.7% by weight, Fe 2 O 3 was 0.2% by weight, and Al 2 O 3 was 0.05% by weight.
- Example 2 The same operation as in Example 1 was performed except that the amount of the titanium tetrachloride aqueous solution was changed to 93.342 kg and the amount of the ferric chloride aqueous solution was changed to 0.36 kg.
- An aqueous dispersion sol containing rutile-type titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 2A”) was obtained.
- Example 3 The same operation as in Example 1 was performed except that the amount of the aqueous solution of titanium tetrachloride was changed to 93.06 kg and the amount of the aqueous solution of ferric chloride was changed to 0.62 kg.
- the iron having a rutile crystal structure and containing tin and silicon An aqueous dispersion sol containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 3A”) was obtained.
- Example 1 The same operation as in Example 1 was performed except that the amount of the titanium tetrachloride aqueous solution was 93.80 kg and the ferric chloride aqueous solution was not added. Titanium oxide fine particles having a rutile crystal structure and containing tin and silicon (hereinafter referred to as “tin oxide fine particles”) An aqueous dispersion sol containing “inorganic oxide fine particles 4A” was obtained.
- Example 2 The same operation as in Example 1 was conducted except that the amount of the titanium tetrachloride aqueous solution was changed to 91.46 kg and the amount of the ferric chloride aqueous solution was changed to 1.82 kg, and the iron having a rutile type crystal structure and containing tin and silicon An aqueous dispersion sol containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 5A”) was obtained.
- inorganic oxide fine particles 5A An aqueous dispersion sol containing titanium oxide fine particles
- Example 3 The same operation as in Example 1 was performed except that the amount of the titanium tetrachloride aqueous solution was 89.116 kg and the amount of the ferric chloride aqueous solution was 3.64 kg. It had a rutile crystal structure and contained iron containing tin and silicon. An aqueous dispersion sol containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 6A”) was obtained.
- a sol (concentration 16) of silica fine particles ie, silica-based fine particles having a specific surface area of 375 m 2 / g and containing 0.4% of aluminum in terms of Al 2 O 3 in 22.5 kg of the aqueous solution of titanic acid peroxide. (% By weight, manufactured by JGC Catalysts & Chemicals Co., Ltd.)) 465.47 g and 29.45 kg of pure water were mixed and heated at 165 ° C. for 18 hours in an autoclave (Pressurized Glass Industry Co., Ltd., 120 L). did.
- the obtained sol is cooled to room temperature, and then concentrated using an ultrafiltration membrane device (ACV-3010, manufactured by Asahi Kasei Co., Ltd.) to obtain a water-dispersed sol having a solid content concentration of 10% by weight. 245 kg was obtained.
- the fine particles contained in the water-dispersed sol thus obtained were titanium oxide fine particles having an anatase type crystal structure and containing silicon (hereinafter referred to as “inorganic oxide fine particles 7A”).
- Comparative Example 5 The same procedure as in Comparative Example 4 was performed except that the amount of the titanium tetrachloride aqueous solution was 99.15 kg, and 170 g of 10% ferric chloride aqueous solution was added to this in terms of Fe 2 O 3. An aqueous dispersion sol containing iron-containing titanium oxide fine particles containing silicon (hereinafter referred to as “inorganic oxide fine particles 8A”) was obtained.
- Example 4 The rutile type was performed in the same manner as in Example 3 except that the amount of silica-based sol 1 (manufactured by JGC Catalysts & Chemicals Co., Ltd.) was changed to 875 g and the amount of pure water mixed with silica-based sol 1 was changed to 14.0 kg.
- Example 5 Except that the amount of the iron-containing titanium peroxide aqueous solution was changed to 75.18 kg, the amount of the cation exchange resin was changed to 3.7 kg, and the amount of the potassium stannate aqueous solution was changed to 6.83 kg, the same operation as in Example 4 was carried out.
- An aqueous dispersion sol containing iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 10A”) having a type crystal structure and containing tin and silicon was obtained.
- Example 6 The same procedure as in Example 3 was performed except that the amount of the iron-containing titanium peroxide aqueous solution was changed to 77.19 kg, the amount of the cation exchange resin to 3.7 kg, and the amount of the potassium stannate aqueous solution to 4.82 kg.
- An aqueous dispersion sol containing iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 11A”) having a type crystal structure and containing tin and silicon was obtained.
- Example 6 The same procedure as in Example 3 was performed except that the amount of the iron-containing titanium peroxide aqueous solution was changed to 65.61 kg, the amount of the cation exchange resin to 3.15 kg, and the amount of the potassium stannate aqueous solution to 16.4 kg.
- An aqueous dispersion sol having an iron-containing titanium oxide fine particle (hereinafter referred to as “inorganic oxide fine particle 12A”) having a type crystal structure and containing tin and silicon was obtained.
- Example 7 The same operation as in Example 3 was carried out except that the amount of the iron-containing titanium peroxide aqueous solution was changed to 78.73 kg, the amount of the cation exchange resin to 3.15 kg, and the amount of the potassium stannate aqueous solution to 3.78 kg.
- An aqueous dispersion sol containing iron-containing titanium oxide fine particles containing silicon and silicon (hereinafter referred to as “inorganic oxide fine particles 13A”) was obtained.
- the crystal form of the inorganic oxide fine particles 13A was a mixed crystal of rutile and anatase.
- Example 8 The same operation as in Example 1 was carried out except that the amount of the silica-based sol 1 was changed to 327 g and the amount of pure water mixed with the silica-based sol 1 was 4.9 kg, having a rutile crystal structure, tin and silicon An aqueous dispersion sol containing iron-containing rutile-type titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 14A”) was obtained.
- Example 9 The same operation as in Example 1 was carried out except that the amount of silica-based sol 1 was changed to 1.709 kg and the amount of pure water mixed with silica-based sol 1 was 27.34 kg.
- An aqueous dispersion sol containing iron-containing titanium oxide fine particles containing silicon and silicon (hereinafter referred to as “inorganic oxide fine particles 15A”) was obtained.
- Example 7 Silica-based sol 1 having a specific surface area of 218 m 2 / g and containing silica in an amount of 0.4% by weight in terms of Al 2 O 3 (that is, silica-based fine particles) sol (pH 2.3, concentration 16% by weight)
- the iron-containing titanium oxide fine particles having the rutile crystal structure and containing tin and silicon hereinafter referred to as “inorganic oxide fine particles 16A”) except for changing to JGC Catalysts & Chemicals Co., Ltd.
- Example 8 Silica-based sol 1 having a specific surface area of 530 m 2 / g and containing silica in an amount of 0.4% by weight in terms of Al 2 O 3 (ie, silica-based fine particles) sol (pH 2.5, concentration 16% by weight)
- the iron-containing titanium oxide fine particles having the rutile crystal structure and containing tin and silicon hereinafter referred to as “inorganic oxide fine particles 17A”) except for changing to JGC Catalysts & Chemicals Co., Ltd.
- Example 9 Silica sol 1 having a specific surface area of 530 m 2 / g and containing 15 wt% of aluminum in terms of Al 2 O 3 (ie, silica-based fine particle) sol (pH 4.0, concentration 16%, JGC catalyst) Except for changing to Kasei Co., Ltd.), the same operation as in Example 1 was performed, and iron-containing titanium oxide fine particles having a rutile crystal structure and containing tin and silicon (hereinafter referred to as “inorganic oxide fine particles 18A”) An aqueous dispersion sol containing was obtained.
- inorganic oxide fine particles 18A iron-containing titanium oxide fine particles having a rutile crystal structure and containing tin and silicon
- the silica-based sol 1 is also referred to as a sol of silica fine particles (that is, silica-based fine particles) having a specific surface area of 263 m 2 / g and containing 0.6% by weight of zirconium in terms of ZrO 2 (hereinafter referred to as “silica-based sol 2”). ) Except for the change to (pH 3.2), the same operation as in Example 1 was performed, and an iron-containing titanium oxide fine particle (hereinafter referred to as “inorganic oxide fine particle 19A”) having a rutile crystal structure and containing tin and silicon. An aqueous dispersion sol containing) was obtained.
- a water-dispersed sol having a solid content concentration of 10% by weight except that the step of obtaining the iron-containing titanate aqueous solution using the iron-containing hydrous titanate cake was changed in this way. 0 kg was obtained.
- the fine particles contained in this water-dispersed sol were iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 20A”) having a rutile crystal structure and containing tin and silicon.
- a water-dispersed sol having a solid content concentration of 10% by weight except that the step of obtaining the iron-containing titanate aqueous solution using the iron-containing hydrous titanate cake was changed as described above. 0 kg was obtained.
- the fine particles contained in the water-dispersed sol were iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 21A”) having a rutile crystal structure and containing tin and silicon.
- an iron-containing titanate aqueous solution using an iron-containing hydrous titanate cake in this manner 10.0 kg of an aqueous dispersion sol having a solid content concentration of 10 wt% was obtained in the same manner as in Example 1. Obtained.
- the fine particles contained in the water-dispersed sol were iron-containing titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 22A”) having a rutile crystal structure and containing tin and silicon.
- silica-based sol 1 was changed to a silica fine particle sol (pH 9.2, concentration 16% by weight, manufactured by JGC Catalysts & Chemicals) with a specific surface area of 530 m 2 / g and no aluminum.
- An aqueous dispersion sol containing iron-containing titanium oxide fine particles containing tin and silicon (hereinafter referred to as “inorganic oxide fine particles 23A”) was obtained.
- the crystal form of the inorganic oxide particles 23A was a mixed crystal of rutile and anatase.
- Example 15 The silica-based sols 2, specific surface area of 530m 2 / g of aluminum 25% by weight comprising silica particles in terms of Al 2 O 3 (i.e., silica-based fine particles) of the sol (pH 4.3, concentration of 16%, JGC Catalysts and Chemicals
- the same operation as in Example 10 was performed except that the product was changed to “made by Co., Ltd.” to obtain an aqueous dispersion sol containing iron-containing titanium oxide fine particles containing tin and silicon (hereinafter referred to as “inorganic oxide fine particles 25A”).
- the crystal form of the inorganic oxide fine particles 25A was a mixed crystal of rutile and anatase.
- Tables 1-1 to 1-3 show the characteristics and evaluation results of the raw materials, inorganic oxide fine particles, and dispersions of Examples 1 to 10 and Comparative Examples 1 to 15 described above.
- the fine particles contained in the water-dispersed sol 1B have a rutile-type crystal structure, and the surface of iron-containing titanium oxide fine particles (core particles) containing tin and silicon is coated with a composite oxide containing zirconium and silicon. It was a core-shell type iron-containing rutile type titanium oxide fine particle (hereinafter referred to as “inorganic oxide fine particle 1B”).
- the appearance of the water-dispersed sol 1B was transparent and slightly yellowish brown.
- the obtained methanol dispersion was concentrated with an ultrafiltration membrane device (SIP-1013, manufactured by Asahi Kasei Co., Ltd.) to obtain a methanol dispersion sol 1Bm containing inorganic oxide fine particles 1B having a solid concentration of 20% by weight. Prepared. The appearance of the methanol-dispersed sol 1Bm was a transparent slightly yellowish brown color.
- Example 12 (1) Preparation process of water-dispersed sol of core-shell type iron-containing rutile titanium oxide fine particles
- the water-dispersed sol obtained in Example 1 was changed to the water-dispersed sol containing the inorganic oxide fine particles 3A obtained in Example 3. Except for the above, the same operation as in Example 11 was performed, and the surface of the iron-containing titanium oxide fine particles (nuclear particles) having a rutile type crystal structure and containing tin and silicon was coated with a composite oxide containing zirconium and silicon.
- An aqueous dispersion sol 3B containing core-shell type iron-containing rutile-type titanium oxide fine particles hereinafter referred to as “inorganic oxide fine particles 3B” was obtained.
- the appearance of the water-dispersed sol 3B was transparent and yellowish brown.
- Step (2) Preparation step of methanol-dispersed sol containing core-shell type iron-containing rutile-type titanium oxide fine particles Except for changing water-dispersed sol 1B to water-dispersed sol 3B, the same operation as in step (2) of Example 11 was performed to obtain a solid A methanol-dispersed sol 3Bm containing inorganic oxide fine particles 3B having a partial concentration of 20% by weight was prepared. The appearance of the methanol-dispersed sol 3Bm was a clear, slightly yellowish brown color.
- Example 13 (1) Preparation process of water-dispersed sol of core-shell type iron-containing rutile-type titanium oxide fine particles To 190 kg of water-dispersed sol containing inorganic oxide fine particles 10A obtained in Example 5, NaOH (manufactured by Asahi Glass Co., Ltd.) After adding 108.2 kg of aqueous NaOH solution dissolved in pure water to a concentration of 3% and adjusting the pH to about 10.5, 283 kg of pure water was added and heated to 90 ° C.
- NaOH manufactured by Asahi Glass Co., Ltd.
- the fine particles contained in the water-dispersed sol 10B have a core-shell type formed by coating the surface of iron-containing titanium oxide fine particles (nuclear particles) having a rutile-type crystal structure and containing tin and silicon with a composite oxide containing silicon and aluminum. It was iron-containing rutile-type titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 10B”). The appearance of the aqueous dispersion sol 10B was slightly yellowish brown.
- Example 16 Except for changing the water-dispersed sol obtained in Example 1 to the water-dispersed sol containing the inorganic oxide fine particles 4A obtained in Comparative Example 1, the same operation as in the step (1) of Example 11 was performed, and the rutile type Core-shell type rutile titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles 4B”) having a crystal structure and having the surface of titanium oxide fine particles (core particles) containing tin and silicon coated with a complex oxide containing zirconium and silicon.
- a methanol-dispersed sol 4Bm containing inorganic oxide fine particles 4B having a solid content concentration of 20% by weight is performed in the same manner as in step (2) of Example 11 except that the water-dispersed sol 1B is changed to the water-dispersed sol 4B.
- the appearance of the methanol-dispersed sol 4Bm was a transparent, slightly bluish color.
- Example 17 The same procedure as in step (1) of Example 11 was performed, except that the water-dispersed sol obtained in Example 1 was changed to a water-dispersed sol containing inorganic oxide fine particles 8A obtained in Comparative Example 5, and anatase-type crystals Core-shell type iron-containing anatase-type titanium oxide fine particles (hereinafter referred to as “inorganic oxide fine particles” formed by coating the surface of iron-containing titanium oxide fine particles (core particles) having a structure and containing silicon with a composite oxide containing zirconium and silicon. 8B ”) was obtained. The appearance of the water-dispersed sol 8B was transparent and slightly milky white.
- a methanol-dispersed sol 8Bm containing inorganic oxide fine particles 8B having a solid content concentration of 20% by weight is performed in the same manner as in step (2) of Example 11 except that the water-dispersed sol 1B is changed to the water-dispersed sol 8B.
- the appearance of the methanol-dispersed sol 8Bm was a light tan color.
- Table 2 shows the characteristics and evaluation results of the inorganic oxide fine particles and dispersions of Examples 11 to 13 and Comparative Examples 16 to 17 described above.
- thermosetting coating composition and substrate with thermosetting coating [Example 14]
- thermosetting coating composition 26.9 g of methanol (manufactured by China Essential Oil Co., Ltd.) was added to 166.3 g of ⁇ -glycidoxypropyltrimethoxysilane (Momentive Performance Materials Japan GK).
- 49.0 g of 0.01N hydrochloric acid was added dropwise with stirring.
- the ⁇ -glycidoxypropyltrimethoxysilane was hydrolyzed by stirring for a whole day and night at room temperature.
- thermosetting coating 1BmH a thermosetting coating composition
- plastic lens base material Prepare a necessary number of commercially available plastic lens base materials with a refractive index of 1.67 (“monomer name: MR-7” manufactured by Mitsui Chemicals) and keep it at 40 ° C. Etching was performed by immersing in a 10 wt% KOH aqueous solution for 2 minutes. Further, this was taken out, washed with water, and sufficiently dried.
- thermosetting coating film The hard coat paint 1BmH obtained above was applied to the surface of the plastic lens substrate to form a coating film.
- coating of the coating composition was performed using the dipping method (drawing speed 190mm / min). The coating film was cured by heating at 90 ° C. for 10 minutes and then at 110 ° C. for 2 hours to obtain a base material 1BmHF with a thermosetting coating film.
- thermosetting coating composition (hereinafter referred to as “hard coat coating 3BmH”) was prepared by performing the same operation as in Example 14 except that the methanol dispersion sol 1Bm was changed to the methanol dispersion sol 3Bm. Material 3BmHF was obtained.
- Example 16 Except that the methanol dispersion sol 1Bm was changed to the methanol dispersion sol 10Bm, the same operation as in Example 14 was performed to prepare a thermosetting coating composition (hereinafter referred to as “hard coat coating 10BmH”), and a base with a thermosetting coating film A material 10BmHF was obtained.
- hard coat coating 10BmH a thermosetting coating composition
- thermosetting coating 4BmH a thermosetting coating composition (hereinafter referred to as “hard coat coating 4BmH”). Material 4BmHF was obtained.
- thermosetting coating 8BmH a thermosetting coating composition (hereinafter referred to as “hard coat coating 8BmH”), and a base with a thermosetting coating film Material 8BmHF was obtained.
- Table 3 shows the evaluation results of the coated substrates obtained in Examples 14-16 and Comparative Examples 18-19.
- PGME propylene glycol monomethyl ether
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Abstract
Description
そこで本発明は、高い屈折率を維持したまま光触媒活性が抑制され、透明性に優れた酸化チタン系微粒子およびその分散液、ならびにその製造方法等を提供することを目的とする。
(1)金属鉱酸塩の水溶液であって、前記金属としてTiおよびFeを、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)=0.001~0.010の割合で含有する水溶液を中和して鉄含有含水チタン酸を得る工程、
(2)工程(1)で得られた鉄含有含水チタン酸に過酸化水素水を加えて、平均粒子径が15~50nmである鉄含有過酸化チタン酸の水溶液を得る工程、
(3)工程(2)で得られた鉄含有過酸化チタン酸の水溶液にスズ化合物を、Snと前記水溶液中のTiとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量=6~16の範囲になるように加える工程、
(4)工程(3)で得られた溶液に、SiとAl、Zr、Sb、Zn、Ni、Ba、MgおよびVからなる群から選択される少なくとも1種の金属元素(M)とを酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量=99.9/0.1~80/20の範囲で含むシリカ系微粒子のゾルを、工程(3)で得られた溶液中の金属元素の量と前記ゾル中のケイ素および金属元素の量とが、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2の合計の質量)=0.08~0.22の関係を満たすように加える工程、
(5)工程(4)で得られた溶液を水熱処理して鉄含有ルチル型酸化チタン微粒子分散液を得る工程
を含む鉄含有ルチル型酸化チタン微粒子分散液の製造方法。
前記シリカ系微粒子の比表面積が100~600m2/gである前記[1]の鉄含有ルチル型酸化チタン微粒子分散液の製造方法。
下記要件(a)~(f)を充足する鉄含有ルチル型酸化チタン微粒子。
(a)TiをTiO2の質量に換算して70質量%以上含み、Feを含み、さらにAl、Zr、Sb、Zn、Ni、Ba、Mg及びVからなる群から選択される少なくとも1種の金属元素(M)、SnおよびSiを含む。
(b)FeとTiとの割合が、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)=0.001~0.010である。
(c)TiとSnとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量=6~18である。
(d)SiとMとの割合が、酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量=99.9/0.1~80/20である。
(e)Siと金属元素との割合が、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2(xはMの価数である。)の合計の質量)=0.08~0.22である。
(f)平均粒子径が4~25nmである。
前記[3]の鉄含有ルチル型酸化チタン微粒子が、Siを含みAl、ZrおよびSbからなる群から選択される少なくとも1種の金属元素を含む酸化物および/または複合酸化物からなる層で被覆されてなるコアシェル型鉄含有ルチル型酸化チタン微粒子。
前記[4]のコアシェル型鉄含有ルチル型酸化チタン微粒子とマトリックス成分とを含む塗料組成物。
前記[5]の塗料組成物を硬化させてなる塗膜。
基材と、該基材の表面に設けられた前記[6]の塗膜とを有する塗膜付基材。
本発明に係る鉄含有ルチル型酸化チタン微粒子分散液の製造方法は、以下の工程(1)~(5)を含んでいる。
工程(1)は、金属鉱酸塩の水溶液であって、前記金属としてTiおよびFeを、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)(以下「Fe2O3/(TiO2+Fe2O3)」とも記載する。)=0.001~0.010の割合で含有する水溶液を中和して鉄含有含水チタン酸を得る工程である。
チタンの鉱酸塩としては、特に限定されるものではないが、例えば、硫酸チタン、硝酸チタン、四塩化チタン、硫酸チタニル、塩化チタニル等が挙げられる。
鉄の鉱酸塩としては、特に限定されるものではないが、例えば、塩化第二鉄、硫酸第一鉄、硝酸第二鉄等が挙げられる。
鉄含有含水チタン酸は、好ましくは純水等により洗浄される。
工程(2)は、工程(1)で得られた鉄含有含水チタン酸に過酸化水素水を加えて、平均粒子径が15~50nmである鉄含有過酸化チタン酸の水溶液を得る工程である。
工程(3)は、工程(2)で得られた鉄含有過酸化チタン酸の水溶液にスズ化合物を、Snと前記水溶液中のTiとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量(以下「TiO2/SnO2」とも記載する。)=6~16の範囲になるように加える工程である。
スズ化合物としては、特に限定されるものではないが、例えば、スズ酸カリウム、硝酸スズ、塩化スズが挙げられる。
工程(4)は、工程(3)で得られた溶液に、SiとAl、Zr、Sb、Zn、Ni、Ba、MgおよびVからなる群から選択される少なくとも1種の金属元素(M)とを酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量(以下「SiO2/MOx/2」とも記載する。)=99.9/0.1~80/20の範囲で含むシリカ系微粒子のゾルを、工程(3)で得られた溶液中の金属元素の量と前記ゾル中のケイ素および金属元素の量とが、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2の合計の質量)(以下「SiO2/(TiO2+SnO2+Fe2O3+SiO2+MOx/2)」とも記載する。)=0.08~0.22(すなわち8~22質量%)の関係を満たすように加える工程である。
工程(5)は、工程(4)で得られた溶液を水熱処理して鉄含有ルチル型酸化チタン微粒子分散液を得る工程である。
本発明の製造方法により得られる鉄含有ルチル型酸化チタン微粒子分散液は、用途に応じて、減圧蒸留、限外ろ過など公知の方法で適宜濃縮して用いてもよい。
前記有機溶媒の例は後述する。
本発明に係る鉄含有ルチル型酸化チタン微粒子は、下記要件(a)~(f)を充足する鉄含有ルチル型酸化チタン微粒子である。
(a)TiをTiO2の質量に換算して70質量%以上含み、Feを含み、さらにAl、Zr、Sb、Zn、Ni、Ba、Mg及びVからなる群から選択される少なくとも1種の金属元素(M)、SnおよびSiを含む。
(b)FeとTiとの割合が、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)=0.001~0.010である。
(c)TiとSnとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量=6~18(上限値は16であってもよい。)である。
(d)SiとMとの割合が、酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量=99.9/0.1~80/20である。
(e)Siと金属元素との割合が、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2(xはMの価数である。)の合計の質量)=0.08~0.22である。
(f)後述する実施例で採用した方法またはこれと同等の方法で測定される平均粒子径が4~25nm、好ましくは12~25nmである。
本発明に係るコアシェル型鉄含有ルチル型酸化チタン微粒子は、本発明に係る鉄含有ルチル型酸化チタン微粒子が、Siを含みAl、ZrおよびSbからなる群から選択される少なくとも1種の金属元素を含む酸化物および/または複合酸化物からなる層(以下「被覆層」ともいう。)で被覆されてなるコアシェル型鉄含有ルチル型酸化チタン微粒子である。
メタノール、エタノール、1-プロパノール、2-プロパノール、1-ブタノール、2-ブタノール、オクタノール等のアルコール類;
酢酸エチル、酢酸ブチル、乳酸エチル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、γ-ブチロラクトン等のエステル類;
ジエチルエーテル、エチレングリコールモノメチルエーテル(メチルセロソルブ)、エチレングリコールモノエチルエーテル(エチルセロソルブ)、エチレングリコールモノブチルエーテル(ブチルセロソルブ)、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル等のエーテル類;
アセトン、メチルエチルケトン、メチルイソブチルケトン、アセチルアセトン、シクロヘキサノン等のケトン類;
ベンゼン、トルエン、キシレン、エチルベンゼン等の芳香族炭化水素;
シクロヘキサン等の環状炭化水素;
ジメチルホルムアミド、N,N-ジメチルアセトアセトアミド、N-メチルピロリドン等のアミド類が挙げられる。これらの有機溶媒は1種単独で用いてもよく、2種以上を併用してもよい。
前記コアシェル型鉄含有ルチル型酸化チタン微粒子を有機溶媒に、または樹脂が分散した溶液に分散させる場合には、分散液中でのコアシェル型鉄含有ルチル型酸化チタン微粒子の凝集を防ぐため、表面処理剤を用いて前記コアシェル型鉄含有ルチル型酸化チタン微粒子の表面に疎水化処理を施してもよい。
本発明に係る塗料組成物は、本発明に係るコアシェル型鉄含有ルチル型酸化チタン微粒子とマトリックス成分とを含む塗料組成物である。この塗料組成物は、さらに硬化触媒または添加剤を含んでいてもよい。
前記塗料組成物は、熱硬化性塗料組成物であってもよく、光硬化性塗料組成物であってもよい。
これらは1種単独で用いてもよく、2種以上を併用してもよい。
本発明に係る塗膜付基材は、基材と、該基材の表面に設けられた本発明に係る塗料組成物から形成された塗膜とを有する塗膜付基材である。
実施例等における測定方法および評価方法を以下に説明する。
各粒子を固形分濃度が3重量%となるように分散媒で希釈し、動的光散乱法による微粒子粒度測定装置(大塚電子社製、ELS-Z)を用いて、粒子径分布を測定した。溶液の屈折率および粘度には、それぞれの分散媒の屈折率および粘度を使用した。平均粒子径はキュムラント解析により求めた。
シリカ微粒子またはシリカ系微粒子のゾル50mlをHNO3でpH3.5に調整し、1-プロパノール40mlを加え、110℃で16時間乾燥させた。得られた残渣を乳鉢で粉砕した後、マッフル炉にて500℃、1時間焼成し、試料を得た。
試料に含まれる溶媒を赤外線照射等により除去した後、残渣を1000℃で1時間焼成して強熱残分(固形分)を得た。試料の重量に対する強熱残分の重量の割合を固形分濃度とした。
固形分重量で0.05gに相当する量の無機酸化物微粒子の水分散液またはメタノール分散液に、水/メタノール=1/1(重量比)、固形分濃度が0.5重量%となるように適宜溶媒を加えた。次いで、得られた分散液とグリセリンとを重量比(分散液重量/グリセリン重量)が1/3となるように混合し、これを奥行き1mm、幅1cm、高さ5cmの石英セルに入れ、色差・濁度測定器(日本電色工業(株)製、COH-400)でYI値を測定した。
(チタニウム、スズおよびケイ素)
無機酸化物微粒子の水分散液をジルコニアボールに採取し、赤外線照射により水分を除去した後、得られた乾燥物を、Na2O2とNaOHを加えて加熱し、溶融させた。得られた溶融物に、さらに、塩酸を加え、希釈のために純水を加えた。
ICP装置(島津製作所(株)製、ICPS-8100)を用いて、得られた溶液中のチタニウム、スズおよびケイ素の量を酸化物換算基準(TiO2、SnO2、SiO2)で測定した。
無機酸化物微粒子の水分散液を白金皿に採取し、フッ化水素酸と硫酸を加えて加熱し、塩酸を加えて、酸化物粒子を溶解させた。さらに、これを純水で希釈した後、ICP装置((株)島津製作所製、ICPS-8100)を用いてジルコニウムおよびアルミニウムの量を酸化物換算基準(ZrO2、Al2O3)で測定した。
無機酸化物微粒子の水分散液を白金皿に採取し、フッ化水素酸と硫酸を加えて加熱し、塩酸を加えて、酸化物粒子を溶解させた。さらに、これを純水で希釈した後、原子吸光装置((株)日立製作所製、Z-5300)を用いてカリウムおよびナトリウムの量を酸化物換算基準(K2O、Na2O)で測定した。
これらの測定結果に基づいて無機酸化物微粒子中の各成分の含有量を算出した。
無機酸化物微粒子(核粒子)の水分散液を、磁製ルツボ(B-2型)に約30ml採取し、110℃で12時間乾燥させた後、残渣をデシケーターに入れて室温まで冷却した。次に、残渣を乳鉢にて15分間粉砕した後、X線回折装置(理学電機(株)製、RINT1400)を用いて結晶形態を測定した。
無機酸化物微粒子の形状を、走査型電子顕微鏡(SEM)((株)日立ハイテクノロジーズ製 S-5500)を用いて、30kVの加速電圧で観察した。観察用の試料は、以下のように作製した。
無機酸化物微粒子の水分散ゾルを水で固形分濃度0.05%に希釈した後、コロジオン膜付金属グリッド(応研商事(株))に塗布し250Wランプにて30分間照射して溶媒を飛散し観察用の試料を作成した。
固形分重量で0.05gに相当する量の無機酸化物微粒子の水分散液またはメタノール分散液に、水/メタノール=1/1(重量比)、固形分濃度0.5重量%となるように適宜溶媒を加えた。次いで、得られた分散液と固形分濃度0.02重量%のサンセットイエロー染料のグリセリン溶液とを重量比(分散液重量/グリセリン溶液重量)が1/3となるように混合して試料を調製し、これを奥行き1mm、幅1cm、高さ5cmの石英セルに入れた。次に、I線(波長365nm)の波長域が選択された紫外線ランプ(AS ONE製SLUV-6)を用いて、前記石英セルの幅1cm×高さ5cmの面に対して距離5.5cmの距離から強度0.4mW/cm2(波長365nm換算)で3時間、紫外線を照射した。
退色変化率(%)=(A3-A0)/A0×100
熱硬化塗膜付基材の塗膜の表面にナイフで縦横それぞれ1mmの間隔で11本の平行な傷を付けて100個の升目を作った。次いで、熱硬化塗膜付基材に対してキセノンウェザーメーター(スガ試験機(株)製、SX-75、UV照射強度60W/m2、試験条件はJIS-K7350-2)を用いて、曝露加速試験を行った後に、升目にセロファンテープを接着し、次いでセロファンテープを剥離し、升目の剥離の有無を確認した。升目の剥離が無い場合には、再び曝露加速試験を行ってから升目にセロファンテープを接着し、次いでセロファンテープを剥離する操作を繰り返し、一つ以上の升目が剥離するまでのUV照射時間の合計を求めた。
光硬化塗膜付フィルムの塗膜の表面にナイフで縦横それぞれ1mmの間隔で11本の平行な傷を付けて100個の升目を作った。次いで、光硬化塗膜付きフィルムに対してキセノンウェザーメーター(スガ試験機(株)製、SX-75、UV照射強度60W/m2)を用いて、曝露加速試験を行った後に、升目にセロファンテープを接着し、次いでセロファンテープを剥離したときに残存している升目を数えた。
表4中の記号の意味は以下のとおりである。
○:残存している升目が100個
△:残存している升目が99~30個
×:残存している升目が29~0個
塗膜外観
○:クラックが見られない
△:クラックの面積が塗膜全面積に対して30%未満
×:クラックの面積が塗膜全面積に対して30%以上
固形分濃度10%の水分散ゾルを光路長33mmのセルに入れ、色差・濁度測定器(日本電色工業(株)製、COH-400)で全光線透過率およびヘーズを測定した。
[実施例1]
四塩化チタンをTiO2換算基準で7.75重量%含む四塩化チタン水溶液(大阪チタニウムテクノロジーズ(株)製)93.665kgと、塩化第二鉄(林純薬(株)製)をFe2O3換算基準で10重量%含む塩化第二鉄水溶液0.218kgとを混合した後、この混合物とアンモニアを15重量%含むアンモニア水(宇部興産(株)製)36.295kgとを混合し、pH9.5の微黄褐色スラリー液を調製した。次いで、このスラリーを濾過した後、濾物を純水で洗浄して、固形分濃度が10重量%の鉄を含む鉄含有含水チタン酸ケーキ72.7kgを得た。
四塩化チタン水溶液の量を93.342kg、塩化第二鉄水溶液の量を0.36kgに変更した以外は実施例1と同じ操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有ルチル型酸化チタン微粒子(以下「無機酸化物微粒子2A」という)を含む水分散ゾルを得た。
四塩化チタン水溶液の量を93.006kg、塩化第二鉄水溶液の量を0.62kgに変更した以外は実施例1と同じ操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子3A」という)を含む水分散ゾルを得た。
四塩化チタン水溶液の量を93.80kgとし、塩化第二鉄水溶液を加えなかった以外は実施例1と同じ操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む酸化チタン微粒子(以下「無機酸化物微粒子4A」という)を含む水分散ゾルを得た。
四塩化チタン水溶液の量を91.46kg、塩化第二鉄水溶液の量を1.82kgに変更した以外は実施例1と同じ操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子5A」という)を含む水分散ゾルを得た。
四塩化チタン水溶液の量を89.116kg、塩化第二鉄水溶液の量を3.64kgとした以外は実施例1と同じ操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子6A」という)を含む水分散ゾルを得た。
四塩化チタンをTiO2換算基準で2.0重量%含む四塩化チタン水溶液(大阪チタニウムテクノロジーズ(株)製)100kgと、アンモニアを15重量%含むアンモニア水(宇部興産(株)製)とを混合して、pH8.5の白色スラリー液を調製した。次いで、このスラリーを濾過した後、純水で洗浄して、固形分濃度が10重量%の含水チタン酸ケーキ20kgを得た。
このようにして得られた水分散ゾル中に含まれる微粒子は、アナターゼ型結晶構造を有し、ケイ素を含む酸化チタン微粒子(以下「無機酸化物微粒子7A」という)であった。
四塩化チタン水溶液の量を99.15kgとし、これにFe2O3基準換算で10%濃度の塩化第二鉄水溶液を170g加えた以外は比較例4と同様の操作を行い、アナターゼ型結晶構造を有し、ケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子8A」という)を含む水分散ゾルを得た。
シリカ系ゾル1(日揮触媒化成(株)製)の量を875g、シリカ系ゾル1と混合する純水の量を14.0kgに変更した以外は実施例3と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子9A」という)を含む水分散ゾルを得た。
鉄含有過酸化チタン水溶液の量を75.18kg、陽イオン交換樹脂の量を3.7kg、スズ酸カリウム水溶液の量を6.83kgに変更した以外は実施例4と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子10A」という)を含む水分散ゾルを得た。
鉄含有過酸化チタン水溶液の量を77.19kg、陽イオン交換樹脂の量を3.7kg、スズ酸カリウム水溶液の量を4.82kgに変更した以外は実施例3と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子11A」という)を含む水分散ゾルを得た。
鉄含有過酸化チタン水溶液の量を65.61kg、陽イオン交換樹脂の量を3.15kg、スズ酸カリウム水溶液の量を16.4kgに変更した以外は実施例3と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子12A」という)を含む水分散ゾルを得た。
鉄含有過酸化チタン水溶液の量を78.73kg、陽イオン交換樹脂の量を3.15kg、スズ酸カリウム水溶液の量を3.78kgに変更した以外は実施例3と同様の操作を行い、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子13A」という)を含む水分散ゾルを得た。無機酸化物微粒子13Aの結晶型はルチルとアナターゼとの混晶であった。
シリカ系ゾル1の量を327g、シリカ系ゾル1と混合する純水の量を4.9kgに変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有ルチル型酸化チタン微粒子(以下「無機酸化物微粒子14A」という)を含む水分散ゾルを得た。
シリカ系ゾル1の量を1.709kg、シリカ系ゾル1と混合する純水の量を27.34kgに変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子15A」という)を含む水分散ゾルを得た。
シリカ系ゾル1を、比表面積が218m2/gでありアルミニウムをAl2O3換算で0.4重量%含有するシリカ微粒子(すなわち、シリカ系微粒子)のゾル(pH2.3、濃度16重量%、日揮触媒化成(株)製)に変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子16A」という)を含む水分散ゾルを得た。
シリカ系ゾル1を、比表面積が530m2/gでありアルミニウムをAl2O3換算で0.4重量%含有するシリカ微粒子(すなわち、シリカ系微粒子)のゾル(pH2.5、濃度16重量%、日揮触媒化成(株)製)に変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子17A」という)を含む水分散ゾルを得た。
シリカ系ゾル1を、比表面積が530m2/gでありアルミニウムをAl2O3換算で15重量%含有するシリカ微粒子(すなわち、シリカ系微粒子)のゾル(pH4.0、濃度16%、日揮触媒化成(株)製)に変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子18A」という)を含む水分散ゾルを得た。
シリカ系ゾル1を、比表面積が263m2/gでありジルコニウムをZrO2換算で0.6重量%含有するシリカ微粒子(すなわち、シリカ系微粒子)のゾル(以下「シリカ系ゾル2」ともいう。)(pH3.2、)に変更した以外は実施例1と同様の操作を行い、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子19A」という)を含む水分散ゾルを得た。
実施例1の鉄含有過酸化チタン酸水溶液を得る段階において、鉄含有含水チタン酸ケーキ72.7kgに、過酸化水素を35%含む過酸化水素水166.0kgおよび純水328.4kgを加えた後、80℃で1時間撹拌し、さらに純水159kg加えて鉄含有過酸化チタン酸をTiO2+Fe2O3換算基準で1重量%含む鉄含有過酸化チタン酸水溶液を726kg得た。この鉄含有過酸化チタン酸水溶液は、透明な若干黄褐色の外観でpHは8.5、水溶液中の粒子の粒子径は12nmであった。
この水分散ゾルに含まれる微粒子は、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子20A」という)であった。
実施例1の鉄含有過酸化チタン酸水溶液を得る段階において、鉄含有含水チタン酸ケーキ72.7kgに、過酸化水素を35%含む過酸化水素水83.0kgおよび純水411.4kgを加えた後、室温で2.5時間撹拌してゆっくりと鉄含有含水チタン酸を解膠し、その後80℃で1時間撹拌し、さらに純水159kg加えて、鉄含有過酸化チタン酸をTiO2+Fe2O3換算基準で1重量%含む鉄含有過酸化チタン酸水溶液を726kg得た。この鉄含有過酸化チタン酸水溶液は、若干白みがかった黄褐色でpHは8.5、水溶液中の粒子の粒子径は90nmであった。
この水分散ゾルに含まれる微粒子は、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子21A」という)であった。
実施例1の鉄含有過酸化チタン酸水溶液を得る段階において、鉄含有含水チタン酸ケーキ72.7kgに、過酸化水素を35%含む過酸化水素水83.0kgおよび純水411.4kgを加えた後、室温で10時間撹拌し、その後80℃で1時間撹拌し、さらに純水159kg加えて、鉄含有過酸化チタン酸をTiO2+Fe2O3換算基準で1重量%含む鉄含有過酸化チタン酸水溶液を726kg得た。この鉄含有過酸化チタン酸水溶液は、白みがかった黄褐色でpHは8.7、水溶液中の粒子の粒子径は110nmであった。
この水分散ゾルに含まれる微粒子は、ルチル型結晶構造を有し、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子22A」という)であった。
シリカ系ゾル1を、比表面積が530m2/gでありアルミニウムを含まないシリカ微粒子のゾル(pH9.2、濃度16重量%、日揮触媒化成(株)製)に変更した以外は同じ手順で、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子23A」という)を含む水分散ゾルを得た。無機酸化物粒子23Aの結晶型はルチルとアナターゼとの混晶であった。
シリカ系ゾル1を、比表面積が218m2/gでありアルミニウムを含まないシリカ微粒子のゾル(pH9.5、濃度16重量%、日揮触媒化成(株)製)に変更した以外は実施例1と同じ操作を行い、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下、「無機酸化物微粒子24A」という)を含む水分散ゾルを得た。無機酸化物粒子24Aの結晶型はルチルとアナターゼとの混晶であった。
シリカ系ゾル2を、比表面積が530m2/gでありアルミニウムをAl2O3換算で25重量%含むシリカ微粒子(すなわち、シリカ系微粒子)のゾル(pH4.3、濃度16%、日揮触媒化成(株)製)に変更した以外は実施例10と同じ操作を行い、スズおよびケイ素を含む鉄含有酸化チタン微粒子(以下「無機酸化物微粒子25A」という)を含む水分散ゾルを得た。無機酸化物微粒子25Aの結晶型はルチルとアナターゼとの混晶であった。
以上の実施例1~10および比較例1~15の原料、無機酸化物微粒子および分散液の特性および評価結果を表1-1~1-3に示す。
[実施例11]
(1)コアシェル型鉄含有ルチル型酸化チタン微粒子の水分散ゾルの調製工程
オキシ塩化ジルコニウム(太陽鉱工(株)製)をZrO2換算基準で2重量%含むオキシ塩化ジルコニウム水溶液26.3kgに、アンモニアを15重量%含むアンモニア水を撹拌下で徐々に添加して、pH8.5のスラリー液を得た。次いで、このスラリーを濾過した後、純水で洗浄して、ジルコニウム成分をZrO2に換算基準で10重量%含むケーキ5.26kgを得た。
次いで、熟成した混合液をオートクレーブ(耐圧硝子工業(株)製、50L)に入れて、165℃の温度で18時間、加熱処理を行った。
水分散ゾル1Bに含まれる微粒子は、ルチル型の結晶構造を有し、スズ及びケイ素を含む鉄含有酸化チタン微粒子(核粒子)の表面を、ジルコニウムおよびケイ素を含む複合酸化物で被覆してなるコアシェル型鉄含有ルチル型酸化チタン微粒子(以下「無機酸化物微粒子1B」という)であった。水分散ゾル1Bの外観は、透明で僅かに黄褐色を帯びた色であった。
前記工程(1)で得られた水分散ゾル1Bを、表面処理剤としてのテトラエトキシシラン(多摩化学工業(株)製)を溶解させたメタノール溶液に撹拌下で添加した。
次に、得られた混合液を50℃の温度に6時間加熱した後、室温まで冷却してから、限外濾過膜装置を用いて混合液中の分散媒を水からメタノール(中国精油(株)製)に置換した。
メタノール分散ゾル1Bmの外観は、透明な僅かに黄褐色を帯びた色であった。
(1)コアシェル型鉄含有ルチル型酸化チタン微粒子の水分散ゾルの調製工程
実施例1で得られた水分散ゾルを実施例3で得られた無機酸化物微粒子3Aを含む水分散ゾルに変更した以外は実施例11と同じ操作を行い、ルチル型の結晶構造を有し、スズおよびケイ素含む鉄含有酸化チタン微粒子(核粒子)の表面を、ジルコニウムおよびケイ素を含む複合酸化物で被覆してなるコアシェル型鉄含有ルチル型酸化チタン微粒子(以下「無機酸化物微粒子3B」という)を含む水分散ゾル3Bを得た。水分散ゾル3Bの外観は、透明で黄褐色を帯びた色であった。
水分散ゾル1Bを水分散ゾル3Bに変更した以外は実施例11の工程(2)と同様の操作を行い、固形分濃度が20重量%の無機酸化物微粒子3Bを含むメタノール分散ゾル3Bmを調製した。
メタノール分散ゾル3Bmの外観は、透明な僅かに黄褐色を帯びた色であった。
(1)コアシェル型鉄含有ルチル型酸化チタン微粒子の水分散ゾルの調製工程
実施例5で得られた無機酸化物微粒子10Aを含む水分散ゾル190kgに、NaOH(旭硝子(株)製)を0.3%濃度になるように純水で溶解したNaOH水溶液108.2kgを加えpHを約10.5に調整した後、純水を283kg加えて90℃まで加熱した。この加熱された水分散ゾルに、実施例11と同様に調製した2重量%珪酸水溶液240kgと、アルミン酸ソーダ(朝日化学工業(株)製)をAl2O3換算基準で0.67%になるように純水で希釈したアルミン酸ソーダ水溶液202kgとを同時に3時間かけて添加した。その後90℃で1時間熟成した後、冷却してから、得られた混合液を限外濾過装置(旭化成(株)製、SIP-1013)を用いて濃縮し、固形分濃度が10重量%の水分散ゾル10Bを得た。
水分散ゾル10Bに陽イオン交換樹脂(三菱化学(株)製)をpHが5になるまで加えた後、メタノールを水分散ゾルと同量加え、限外濾過装置を用いて分散媒を水からメタノールに置換し、濃縮して固形分濃度が20重量%の無機酸化物微粒子10Bを含むメタノール分散ゾル10Bmを調製した。
実施例1で得られた水分散ゾルを比較例1で得られた無機酸化物微粒子4Aを含む水分散ゾルに変更した以外は実施例11の工程(1)と同じ操作を行い、ルチル型の結晶構造を有し、スズおよびケイ素を含む酸化チタン微粒子(核粒子)の表面を、ジルコニウムおよびケイ素を含む複合酸化物で被覆してなるコアシェル型ルチル型酸化チタン微粒子(以下「無機酸化物微粒子4B」という)を含む水分散ゾル4Bを得た。水分散ゾル4Bの外観は、透明で僅かに乳白色を示した。
メタノール分散ゾル4Bmの外観は、透明な僅かに青味を帯びた色であった。
実施例1で得られた水分散ゾルを比較例5で得られた無機酸化物微粒子8Aを含む水分散ゾルに変更した以外は実施例11の工程(1)と同じ操作を行い、アナターゼ型結晶構造を有し、ケイ素を含む鉄含有酸化チタン微粒子(核粒子)の表面を、ジルコニウムおよびケイ素を含む複合酸化物で被覆してなるコアシェル型鉄含有アナターゼ型酸化チタン微粒子(以下「無機酸化物微粒子8B」という)を含む水分散ゾル8Bを得た。水分散ゾル8Bの外観は、透明で僅かに乳白色を示した。
メタノール分散ゾル8Bmの外観は、薄い黄褐色であった。
[実施例14]
(1)熱硬化性塗料組成物の調製
γ-グリシドキシプロピルトリメトキシシラン(モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製)166.3gにメタノール(中国精油(株)製)24.9gを加えて、撹拌しながら0.01N塩酸49.0gを滴下した。更に室温で一昼夜撹拌して前記γ―グリシドキシプロピルトリメトキシシランの加水分解を行った。
次いで、この混合液に、メタノール分散ゾル1Bmを662.6g、プロピレングリコールモノメチルエーテル(ダウケミカル日本製)を50.8g、イタコン酸(キシダ化学製)を28.5g、ジシアンジアミド(キシダ化学製)を10.3g、およびレベリング剤としてシリコーン系界面活性剤(東レ・ダウコーニング(株)製、L-7001)を6.7g加えて、室温で一昼夜撹拌した。これにより、熱硬化性塗料組成物(以下「ハードコート塗料1BmH」という)を調製した。
市販の屈折率1.67のプラスチックレンズ基材(三井化学(株)製の「モノマー名:MR-7」)を必要な枚数準備し、40℃に保った10重量%濃度のKOH水溶液に2分間浸漬してエッチング処理を行った。更にこれを取り出して水洗した後、十分に乾燥させた。
前記プラスチックレンズ基材の表面に、上記で得られたハードコート塗料1BmHを塗布し塗膜を形成した。塗料組成物の塗布は、ディッピング法(引上げ速度190mm/分)を用いて行った。前記塗膜を、90℃で10分、次いで110℃で2時間、加熱処理して硬化させ、熱硬化塗膜付基材1BmHFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル3Bmに変更した以外は実施例14と同様の操作を行い、熱硬化性塗料組成物(以下「ハードコート塗料3BmH」という)を調製し、熱硬化塗膜付基材3BmHFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル10Bmに変更した以外は実施例14と同様の操作を行い、熱硬化性塗料組成物(以下「ハードコート塗料10BmH」という)を調製し、熱硬化塗膜付基材10BmHFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル4Bmに変更した以外は実施例14と同様の操作を行い、熱硬化性塗料組成物(以下「ハードコート塗料4BmH」という)を調製し、熱硬化塗膜付基材4BmHFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル8Bmに変更した以外は実施例14と同様の操作を行い、熱硬化性塗料組成物(以下「ハードコート塗料8BmH」という)を調製し、熱硬化塗膜付基材8BmHFを得た。
[実施例17]
(1)コアシェル型鉄含有ルチル型酸化チタン微粒子のPGME分散ゾルの調製
固形分濃度が20重量%の400gのメタノール分散ゾル1Bmに、アンモニア濃度が200ppmとなるように15%濃度のアンモニア水溶液を添加し、次いで、3-メタクリロキシプロピルトリメトキシシラン(信越製:KBM-503)8gを添加して、50℃で18時間撹拌した。次いで、プロピレングリコールモノメチルエーテル(以下「PGME」と記載する。三京化成(株)製)を320g加えてロータリーエボパレータにて減圧加温下で363gとなるまで溶媒除去した後にPGMEをさらに添加し、固形分濃度が20重量%のPGME分散ゾル1Bpを得た。PGME分散ゾル1Bpの粘度は2.7mPa・sであった。
PGME分散ゾル1Bp7.47gに対して、PGME(三京化成)を0.57g,アセトン(キシダ化学)を1.25g、DPHA(日本化薬製:カヤラットDPHA)を0.60g、1,6-ヘキサンジオールジアクリレート(巴工業製:SR-238F)を0.07gおよび光硬化用硬化触媒(BASF製:イルガキュア184)を0.04g撹拌しながら添加、混合し、光硬化性塗料組成物1BpUを得た。
易接着層付き188μmPETフィルム(東洋紡製:A4300)に光硬化性塗料組成物1BpUをバーコーター(#34)を用いて塗布した後、80℃-5分の熱処理で溶媒を除去し、密閉容器に入れて窒素充填を行った。これに紫外線をヘレウスUV-Hバルブで600mJ/cm2照射し、光硬化塗膜付フィルム1BpUFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル4Bmに変更した以外は実施例17と同様の操作を行い固形分濃度が20重量%のPGME分散ゾル4Bp(粘度2.5mPa・s)、光硬化性塗料組成物4BpU、および光硬化塗膜付フィルム4BpUFを得た。
メタノール分散ゾル1Bmをメタノール分散ゾル8Bmに変更した以外は実施例17と同様の操作を行い固形分濃度が20重量%のPGME分散ゾル8Bp(粘度2.8mPa・s)、光硬化性塗料組成物8BpU、および光硬化塗膜付フィルム8BpUFを得た。
以上の実施例17および比較例20~21の光硬化塗膜付フィルムの評価結果を表4に示す。
Claims (7)
- (1)金属鉱酸塩の水溶液であって、前記金属としてTiおよびFeを、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)=0.001~0.010の割合で含有する水溶液を中和して鉄含有含水チタン酸を得る工程、
(2)工程(1)で得られた鉄含有含水チタン酸に過酸化水素水を加えて、平均粒子径が15~50nmである鉄含有過酸化チタン酸の水溶液を得る工程、
(3)工程(2)で得られた鉄含有過酸化チタン酸の水溶液にスズ化合物を、Snと前記水溶液中のTiとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量=6~16の範囲になるように加える工程、
(4)工程(3)で得られた溶液に、SiとAl、Zr、Sb、Zn、Ni、Ba、MgおよびVからなる群から選択される少なくとも1種の金属元素(M)とを酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量=99.9/0.1~80/20の範囲で含むシリカ系微粒子のゾルを、工程(3)で得られた溶液中の金属元素の量と前記ゾル中のケイ素および金属元素の量とが、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2の合計の質量)=0.08~0.22の関係を満たすように加える工程、
(5)工程(4)で得られた溶液を水熱処理して鉄含有ルチル型酸化チタン微粒子分散液を得る工程
を含む鉄含有ルチル型酸化チタン微粒子分散液の製造方法。 - 前記シリカ系微粒子の比表面積が100~600m2/gである請求項1に記載の鉄含有ルチル型酸化チタン微粒子分散液の製造方法。
- 下記要件(a)~(f)を充足する鉄含有ルチル型酸化チタン微粒子。
(a)TiをTiO2の質量に換算して70質量%以上含み、Feを含み、さらにAl、Zr、Sb、Zn、Ni、Ba、Mg及びVからなる群から選択される少なくとも1種の金属元素(M)、SnおよびSiを含む。
(b)FeとTiとの割合が、酸化物の質量に換算してFe2O3の質量/(TiO2およびFe2O3の合計の質量)=0.001~0.010である。
(c)TiとSnとの割合が、酸化物の質量に換算してTiO2の質量/SnO2の質量=6~18である。
(d)SiとMとの割合が、酸化物の質量に換算してSiO2の質量/MOx/2(xはMの価数である。)の質量=99.9/0.1~80/20である。
(e)Siと金属元素との割合が、酸化物の質量に換算してSiO2の質量/(TiO2、SnO2、Fe2O3、SiO2およびMOx/2(xはMの価数である。)の合計の質量)=0.08~0.22である。
(f)平均粒子径が4~25nmである。 - 請求項3に記載の鉄含有ルチル型酸化チタン微粒子が、Siを含みAl、ZrおよびSbからなる群から選択される少なくとも1種の金属元素を含む酸化物および/または複合酸化物からなる層で被覆されてなるコアシェル型鉄含有ルチル型酸化チタン微粒子。
- 請求項4に記載のコアシェル型鉄含有ルチル型酸化チタン微粒子とマトリックス成分とを含む塗料組成物。
- 請求項5に記載の塗料組成物を硬化させてなる塗膜。
- 基材と、該基材の表面に設けられた請求項6に記載の塗膜とを有する塗膜付基材。
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CN115335329A (zh) * | 2020-03-26 | 2022-11-11 | 帝化株式会社 | 金红石型氧化钛有机溶胶和金红石型氧化钛有机溶胶的制造方法以及使用该金红石型氧化钛有机溶胶的高折射率覆膜形成用组合物和光学元件 |
JP7399599B2 (ja) | 2020-03-26 | 2023-12-18 | テイカ株式会社 | ルチル型酸化チタンオルガノゾルおよびルチル型酸化チタンオルガノゾルの製造方法並びにこのルチル型酸化チタンオルガノゾルを用いた高屈折率被膜形成用組成物および光学素子 |
WO2021193262A1 (ja) * | 2020-03-26 | 2021-09-30 | テイカ株式会社 | ルチル型酸化チタンオルガノゾルおよびルチル型酸化チタンオルガノゾルの製造方法並びにこのルチル型酸化チタンオルガノゾルを用いた高屈折率被膜形成用組成物および光学素子 |
KR102784948B1 (ko) * | 2020-03-26 | 2025-03-25 | 데이까 가부시끼가이샤 | 루틸형 산화티타늄 오르가노졸 및 루틸형 산화티타늄 오르가노졸의 제조 방법 그리고 이 루틸형 산화티타늄 오르가노졸을 사용한 고굴절률 피막 형성용 조성물 및 광학 소자 |
JPWO2021193262A1 (ja) * | 2020-03-26 | 2021-09-30 | ||
KR20220160005A (ko) | 2020-03-31 | 2022-12-05 | 닛키 쇼쿠바이카세이 가부시키가이샤 | 지르코니아 피복 산화티탄 미립자의 제조방법, 지르코니아 피복 산화티탄 미립자 및 그의 용도 |
WO2021200135A1 (ja) | 2020-03-31 | 2021-10-07 | 日揮触媒化成株式会社 | ジルコニア被覆酸化チタン微粒子の製造方法、ジルコニア被覆酸化チタン微粒子およびその用途 |
WO2022210973A1 (ja) | 2021-03-31 | 2022-10-06 | 日揮触媒化成株式会社 | ルチル型の結晶構造を有する粒子およびその製造方法、並びに粒子の分散液、塗布液、膜付基材の製造方法 |
WO2022239788A1 (ja) * | 2021-05-11 | 2022-11-17 | 日揮触媒化成株式会社 | ルチル型酸化チタン粒子、分散液、塗膜形成用塗布液、および塗膜付基材 |
WO2023100947A1 (ja) * | 2021-12-03 | 2023-06-08 | 日産化学株式会社 | 変性金属酸化物コロイド粒子、およびその製造方法 |
WO2024236995A1 (ja) * | 2023-05-16 | 2024-11-21 | 日産化学株式会社 | コアシェル構造を有する金属酸化物粒子及びその製造方法 |
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EP3604226A4 (en) | 2021-01-13 |
JP7060583B2 (ja) | 2022-04-26 |
TW201843108A (zh) | 2018-12-16 |
CN110809561A (zh) | 2020-02-18 |
KR20190135997A (ko) | 2019-12-09 |
EP3604226A1 (en) | 2020-02-05 |
CN110809561B (zh) | 2021-10-29 |
US11679990B2 (en) | 2023-06-20 |
US12122684B2 (en) | 2024-10-22 |
TWI765016B (zh) | 2022-05-21 |
US20230303403A1 (en) | 2023-09-28 |
EP3604226B1 (en) | 2025-04-23 |
US20200087162A1 (en) | 2020-03-19 |
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KR102445099B1 (ko) | 2022-09-19 |
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