KR101896011B1 - Anti-corrision varnish composition and forming method for anti-corrision coating layer using the same - Google Patents

Abstract

An anti-corrosive coating composition and a method for forming a rust-preventive coating layer using the same are disclosed. In one embodiment, the anti-corrosive coating composition comprises from 30 to 60% by weight of a soluble silicate polymer prepared by polymerizing at least one of sodium silicate, potassium silicate, lithium silicate and colloidal silica; More than 0 to 5% by weight of alcohol; 5 to 35% by weight of a metal mixture comprising aluminum, zinc and germanium oxide; 5 to 25% by weight of silane condensate; 0.1-10 wt% rare earth oxide; And residual water.

Description

TECHNICAL FIELD [0001] The present invention relates to a rust-preventive coating composition and a method for forming a rust-preventive coating layer using the same.

The present invention relates to a rust preventive coating composition and a method for forming a rust preventive coating layer using the same. More particularly, the present invention relates to a one-pack type anticorrosive coating composition which is eco-friendly, can be dried at room temperature, and is excellent in anti-corrosive properties, adhesiveness and mechanical strength of a rust-preventive coating layer and a method for forming a rust-

Metal materials used in various structures such as automobiles, electronic products, industrial machinery, plants, and electric power facilities require corrosion treatment because they easily corrode under corrosive substances (such as SOx, NOx, and salt) and atmospheric conditions.

Generally, in order to suppress corrosion of such a metal material, the surface of the metal material has been painted with a rust-preventive coating composition. Chromate rust prevention treatment is mainly used. Chromate The anti-rust treatment refers to a method of applying a thin film by supporting a metal in a composition containing chromic acid or dichromate as a main component. The chromate anticorrosive treatment is the most commonly used method of treating the dark, but it contains a hexavalent chromium which is classified as a heavy metal, and thus has a fatal problem that it is harmful to the human body. Hexavalent chromium is known to be a primary carcinogen causing cancer of the larynx and its use is regulated internationally. Countries around the world, including the European Union, regulate the use of chromium in conjunction with lead, cadmium and mercury. Previously, manufacturing and process emissions were regulated, but recently, the final products that were treated with chromate were also regulated. Therefore, development of a rust-preventive coating composition that does not contain hexavalent chromium is required.

On the other hand, the rust-proofing process of a steel structure using a conventional rust-preventive coating composition is problematic in that it requires a heat drying process, which causes a lot of economic loss and adversely affects the environment such as energy consumption and greenhouse gas emission due to the heating and drying process.

BACKGROUND ART [0002] The background art relating to the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2016-0100761 (published on Aug. 26, 2014, entitled Quick-drying transparent ceramic anti-corrosive coating material and its production method, coating method using this coating material, Coated steel material).

It is an object of the present invention to provide a rust-preventive coating composition which is excellent in rust-inhibiting properties and adhesion to a substrate.

Another object of the present invention is to provide a rust-preventive coating composition excellent in environmental friendliness, storage stability at room temperature and workability.

Another object of the present invention is to provide a rust-preventive coating composition which is excellent in mechanical properties such as water resistance, chemical resistance, heat resistance and rigidity when forming a rust-preventive coating layer.

It is still another object of the present invention to provide a method for forming a rust-preventive coating layer using the above-mentioned rust-preventive coating composition.

One aspect of the present invention relates to an anti-corrosive coating composition. In one embodiment, the anti-corrosive coating composition comprises from 30 to 60% by weight of a soluble silicate polymer prepared by polymerizing at least one of sodium silicate, potassium silicate, lithium silicate and colloidal silica; More than 0 to 5% by weight of alcohol; 5 to 35% by weight of a metal mixture comprising aluminum, zinc and germanium oxide; 5 to 25% by weight of silane condensate; 0.1-10 wt% rare earth oxide; And residual water.

In one embodiment, the soluble silicate polymer comprises heating the silicate composition comprising at least one of the sodium silicate, potassium silicate, lithium silicate, and colloidal silica, water and a polymerization initiator to 50 to 250 ° C. .

In one embodiment, the soluble silicate polymer may include the colloidal silica and at least one of the sodium silicate, potassium silicate, and lithium silicate in a weight ratio of 1: 1.5 to 1: 5.

In one embodiment, the rare earth oxide may comprise at least one of cerium oxide, europium oxide, yttrium oxide, lanthanum oxide, neodymium oxide, praseodymium oxide and gadolinium oxide.

In one embodiment, the rare earth oxide may include yttrium oxide and europium oxide in a weight ratio of 1: 2 to 1: 5.

In one embodiment, the silane condensate is prepared using a first mixture comprising a silane coupling agent, a condensation initiator, and water (deionized water), wherein the silane coupling agent is selected from the group consisting of 3-aminopropyltriethoxysilane, (Meth) acrylate, 3-methacryloxypropyltrimethoxysilane, beta- (3, < RTI ID = 0.0 & 4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, and N-propyltrimethoxysilane. .

In one embodiment, the metal mixture may include aluminum, zinc, and germanium oxide in a weight ratio of 1: 5 to 10: 2 to 5.

In one embodiment, the additive is further added in an amount of 0.01 to 15% by weight based on the total weight of the anti-corrosive coating composition, and the additive is selected from the group consisting of a dispersant, a thixotropic agent, a plasticizer, a defoaming agent, a thickener, a sedimentation inhibitor, an antioxidant, And a pigment.

Another aspect of the present invention relates to a method for forming a rust-preventive coating layer using the rust-preventive coating composition. In one embodiment, the method for forming a rust-preventive coating layer comprises: applying the rust-preventive coating composition to a substrate surface; And curing the applied anti-corrosive coating composition to form a rust-preventive coating layer.

In one embodiment, the thickness of the rust-preventive coating layer may be between 0.01 and 5 mm.

The anticorrosive coating composition of the present invention is excellent in anticorrosive properties and adhesion to substrates and is excellent in environmental friendliness because it does not contain components such as chromium (Cr), mercury (Hg) and lead (Pb) And excellent mechanical properties such as chemical resistance, water resistance, heat resistance, and rigidity can be obtained when a rust-preventive coating layer is formed.

Fig. 1 is a photograph comparing the results of the rust prevention test of the test piece according to the present invention and the test piece according to the present invention.
Fig. 2 is a product recommendation document relating to an anticorrosive coating composition according to an embodiment of the present invention.
Fig. 3 is a product recommendation document relating to an anticorrosive coating composition according to an embodiment of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be exemplary, self-explanatory, allowing for equivalent explanations of the present invention.

Anti-corrosive coating composition

One aspect of the present invention relates to an anti-corrosive coating composition. In one embodiment, the anti-corrosive coating composition comprises from 30 to 60% by weight of a soluble silicate polymer prepared by polymerizing at least one of sodium silicate, potassium silicate, lithium silicate and colloidal silica; More than 0 to 5% by weight of alcohol; 5 to 35% by weight of a metal mixture comprising aluminum, zinc and germanium oxide; 5 to 25% by weight of silane condensate; 0.1-10 wt% rare earth oxide; And residual water.

Hereinafter, the components of the anti-corrosive coating composition will be described in more detail.

Soluble silicate polymer

The soluble silicate polymer improves the storage stability of the composition of the present invention, realizes the adherence and mechanical strength of the present invention, and can serve as a binding component of the composition such as the metal component of the present invention.

The soluble silicate polymer is prepared by polymerizing at least one of sodium silicate, potassium silicate, lithium silicate, and colloidal silica.

In one embodiment, the molar ratio of SiO ₂ and Na ₂ O of the sodium silicate may be 1: 1 to 4.1: 1. The molar ratio of SiO _{2 to} K ₂ O of the potassium silicate may be 1: 1 to 4.8: 1. For example, from 3.2: 1 to 4.8: 1. SiO ₂ and the molar ratio of Li ₂ O of the lithium silicate is 1: 1 ~ 8: 1. For example from 4.1: 1 to 8: 1. When the molar ratio of the above conditions is applied, it is excellent in water resistance and stability, and the rust-preventive coating composition can have excellent rust-preventive properties, water resistance and mechanical properties.

The alkali of the colloidal silica may be at least one of Na ₂ O and NH ₂ , and the alkali may be contained in an amount of 0 to 3 wt% based on the total weight of the colloidal silica. Under the above conditions, the waterproofing and stability of the present invention is excellent, and the rust-preventive coating composition can have excellent rust-preventive properties, water resistance, and mechanical properties.

In one embodiment, the soluble silicate polymer may be prepared by polymerizing a silicate composition comprising at least one of sodium silicate, potassium silicate, lithium silicate, and colloidal silica, deionized water, and a polymerization initiator.

In one embodiment, the polymerization initiator may comprise at least one of monoethanolamine, diethanolamine, triethanolamine, monoethylamine, diethylamine, triethylamine, NN-dimethylethanolamine and NN-diethylethanolamine have.

In one embodiment, the soluble silicate polymer comprises heating the silicate composition comprising at least one of the sodium silicate, potassium silicate, lithium silicate, and colloidal silica, water and a polymerization initiator to 50 to 250 ° C. . Under these conditions, a soluble silicate polymer can be easily prepared.

In one embodiment, the silicate composition may be heated while stirring at 0 to 1000 rpm or less during the heating. Polymerization can be easily carried out under the above conditions.

In one embodiment, the heating time may be from 0.3 hours to 48 hours. Polymerization can be facilitated under the above conditions. For example from 0.5 to 24 hours. Other examples may be 1 to 12 hours.

In one embodiment, the viscosity of the soluble silicate polymer may be 10 to 50,000 cPs measured at 25 ° C. Under the above conditions, the composition is excellent in storage stability and workability, and the rheological coating layer can have excellent mechanical properties. For example, 20 to 3,000 cPs.

In one embodiment, the pH of the soluble silicate polymer may be from 7 to 14. Gelation of the polymer under the above conditions is prevented, and the workability can be excellent. For example, 9 to 13 days. Another example is 9 to 12 days.

In one embodiment, the soluble silicate polymer may have a nonvolatile content of 10 to 90% by weight. The storage stability of the composition and the coating film adhesion are excellent under the above conditions, and the rustproofing property and the water resistance can be prevented from deteriorating.

In one embodiment, the soluble silicate polymer is included in an amount of 30 to 60 wt% based on the total weight of the anti-corrosive coating composition. When the soluble silicate polymer is contained in an amount of less than 30% by weight, the storage stability of the composition and the adhesion of the anti-corrosive coating layer are lowered. When the soluble silicate polymer is contained in an amount exceeding 60% by weight, the anti-

In one embodiment, the soluble silicate polymer may include the colloidal silica and at least one of the sodium silicate, potassium silicate, and lithium silicate in a weight ratio of 1: 1.5 to 1: 5. When included in the above weight range, the rust-preventive and water-resistant properties of the present invention are excellent, and the mechanical properties of the rust-preventive coating layer can be simultaneously excellent. For example, colloidal silica and the sodium silicate, potassium silicate and lithium silicate can be contained in a weight ratio of 1: 2 to 1: 3.

Alcohol

The alcohol serves as a solvent. The alcohol may include an alcohol having 1 to 10 carbon atoms. For example, methanol, ethanol, propanol, and butanol. In one embodiment, the alcohol is present in an amount of greater than 0 to 5% by weight based on the total weight of the composition. When the alcohol is contained in an amount exceeding 5% by weight, the workability and mechanical properties of the composition of the present invention may be deteriorated.

Metal mixture

The metal mixture comprises aluminum, zinc and germanium oxide. The aluminum and zinc are anodic action by self-sacrificing, and they act to prevent corrosion of iron and other metal substrates before they are corroded.

In one embodiment, the metal mixture is selected from the group consisting of zinc powder, zinc flakes, zinc alloy flakes, aluminum powder, aluminum flakes, aluminum alloy powder and flakes, magnesium alloy powder, iron oxide, titanium dioxide, aluminum silicate, calcium silicate, Zinc carbonate, zinc phosphate, and the like.

In one embodiment, the zinc and aluminum may be applied in flake form. Since the zinc flake and the aluminum flake have a higher ionization tendency than iron, they form an electric circuit by anodic action, and corrosion of iron can be suppressed by such electric action.

In one embodiment, the zinc flake and the aluminum flake may be sheet-like. In one embodiment, the zinc flakes have an average thickness of 0.1 to 1.0 μm and an average width of 5 to 18 μm. The aluminum flakes may be used to pass through 100 mesh. In one embodiment, aluminum flakes and zinc flakes may be included in a weight ratio of 1: 5 to 1:10. And the appearance and rustproofing property of the present invention can be excellent in the weight ratio.

In one embodiment, the aspect ratio of the zinc and aluminum flakes may be 1: 10-100.

The metal mixture may contain one or more plate-shaped metal fine powder, and may further include a spherical metal fine powder.

The above-mentioned germanium oxide (GeO ₂ ) is included for the purpose of further improving the adhesion of the rust-preventive coating layer of the present invention to the substrate.

In one embodiment, the metal mixture may include aluminum, zinc, and germanium oxide in a weight ratio of 1: 5 to 10: 2 to 5. The storage stability, workability, rust prevention and adhesion of the present invention can be excellent in the above mixing ratio by weight. For example, from 1: 6 to 8: 2 to 3 by weight.

In one embodiment, the metal mixture is included in an amount of 5 to 35% by weight based on the total weight of the anti-corrosive coating composition. When the metal mixture is contained in an amount of less than 5% by weight, the rust-preventive and adhesive properties of the present invention are lowered. When it exceeds 35% by weight, the mechanical strength of the rust- .

Silane Condensate

The silane condensate may form a plurality of layers together with the metal mixture or the like to protect the surface of the metal substrate to significantly reduce the corrosion rate. In addition, the silane condensate may adsorb to water before the aluminum flake and the zinc flake in the metal mixture to block the reaction between water and the aluminum flake and the zinc flake, so that the storage stability can be excellent.

In one embodiment, the silane condensate may be prepared using a first mixture comprising a silane coupling agent, a condensation initiator, and water (deionized water).

In one embodiment, the silane coupling agent is selected from the group consisting of 3-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl (methyl) 3-methacryloxypropyltrimethoxysilane, beta - (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, methyltrimethoxysilane, ethyltriethoxysilane, Methoxysilane, and N-propyltrimethoxysilane.

In one embodiment, the condensation initiator is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, monoethylamine, diethylamine, triethylamine, N, N-dimethylethanolamine, N- Methyldiethanolamine, and N-methylethanolamine.

In one embodiment, the deionized water may be used in an amount of 30 to 70% by weight based on the total weight of the silane polymer and the reaction initiator. The condensation product can be easily produced under the above conditions.

In one embodiment, the silane condensate is included in an amount of 5 to 25% by weight based on the total weight of the composition. When the silane condensate is contained in an amount of less than 5% by weight, the mechanical strength and storage stability of the composition of the rust-preventive coating layer of the present invention are deteriorated. When the silane condensate is contained in an amount exceeding 25% by weight, the rust-

Rare earth oxide

The rare earth oxides are included for the purpose of further improving the adhesion and mechanical strength of the rust-preventive coating layer of the present invention. The rare earth oxide is cerium oxide (CeO _2), europium oxide (Eu ₂ O _3). In one embodiment, Yttrium oxide (Y ₂ O _3), lanthanum oxide (La ₂ O _3), neodymium (Nd ₂ O ₃₎ oxide , Praseodymium oxide (Pr ₆ O ₁₁ ), and gadolinium oxide (Gd ₂ O ₃ ). For example, yttrium oxide and europium oxide.

In one embodiment, the rare earth oxide may include yttrium oxide and europium oxide in a weight ratio of 1: 2 to 1: 5. When included in the weight ratio, the adhesion of the rust-preventive coating layer to the metal substrate of the present invention and mechanical strength can be excellent.

In one embodiment, the rare earth oxide is included in an amount of 0.1 to 10% by weight based on the total weight of the rust-preventive coating composition. When the rare earth oxide is contained in an amount of less than 0.1% by weight, the adhesion and mechanical strength of the present invention are lowered. When the rare earth oxide is contained in an amount exceeding 10% by weight, the rust resistance of the present invention may be deteriorated.

water

The water is included in the present invention for the purpose of imparting the mixing property and workability of the composition components. The water may be deionized water.

additive

In one embodiment of the invention, the anti-corrosive coating composition may further comprise additives. In one embodiment, the additive may include at least one of a dispersant, a thixotropic agent, a plasticizer, a defoamer, a thickener, an anti-settling agent, an antioxidant, a light stabilizer, a wetting agent, a polymerizer and a pigment.

In one embodiment, the additive may be included in an amount of 0.1 to 15% by weight based on the total weight of the rust-preventive coating composition.

In one embodiment, Dispex CX-4320 (BASF) and SN-DLSPERSANT 5029 (SAN-NOPCO) can be used as the dispersant.

In one embodiment, Foamaster NDW (BASF) and TEGO TWIN-4100 (EVONIK) can be used as the antifoaming agent.

In one embodiment, the thickening agent may include hydroxylethyl cellulose, polyacrylic acid polymer, polyurethane, and the like.

In one embodiment, the sedimentation inhibitor may include bentonite, laponite, xanthan gum, polyethylene wax, modified and unmodified dry silica, and the like.

In one embodiment, FA-4431 (BASF) and TEGO 750W (EVONIK) can be used as the wetting agent.

 The anti-corrosive coating composition according to an embodiment of the present invention is advantageous in that it is water-soluble and has little VOC so that a pleasant working environment can be obtained. The anti-corrosive coating composition according to an embodiment of the present invention may be provided as a one-pack type room temperature storage type.

The anticorrosive coating composition of the present invention is excellent in anticorrosive properties and adhesion to substrates and is excellent in environmental friendliness because it does not contain components such as chromium (Cr), mercury (Hg) and lead (Pb) And excellent mechanical properties such as chemical resistance, water resistance, heat resistance, and rigidity can be obtained when a rust-preventive coating layer is formed.

Method for forming a rust-preventive coating layer using a rust-preventive coating composition

Another aspect of the present invention relates to a method for forming a rust-preventive coating layer using the rust-preventive coating composition. In one embodiment, the method for forming a rust-preventive coating layer comprises: applying a rust-preventive coating composition according to any one of the preceding claims to a substrate surface; And curing the applied anti-corrosive coating composition to form a rust-preventive coating layer. In one embodiment, the curing may be performed at a temperature ranging from 10 to 50 < 0 > C. In one embodiment, the thickness of the rust-preventive coating layer may be between 0.01 and 5 mm. Within the above range, the rust-preventive coating layer of the present invention can be excellent in mechanical strength, adhesion and rust prevention.

In one embodiment, the anti-corrosive coating composition can be applied to the surface of the substrate using processes such as DIP-SPIN, DIP-DRAIN, and SPRAY.

The rust-preventive coating composition according to an embodiment of the present invention can be used for forming a rust-preventive coating layer of a metal structure such as automobile, electric / electronic, construction, ship, and the like. It can be used for the prevention of piping facilities such as automobile body, automobile interior parts, bridges and structures, vessel interior / exterior materials, street lamps, steel houses, steel pipes, cast iron pipes, steel structures,

Hereinafter, the structure and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example  And Comparative Example

The components used in the following examples and comparative examples are as follows.

(A1) Soluble Silicate Polymer: Deionized water and a polymerization initiator (N, N-dimethylethanolamine) were slowly added to the reactor at a weight ratio of 1: 1, stirred, and left standing for 24 hours to prepare a polymerization initiator mixture. 20 g of lithium silicate with a molar ratio of SiO ₂ and Li ₂ O of 4.8: 1 were metered in and metered in and 90 g of sodium silicate with a molar ratio of SiO ₂ and Na ₂ O of 4.1: 1 were metered in and stirred to form SiO ₂ and K ₂ O 90 g of potassium silicate having a molar ratio of 4.1: 1 was gradually added over 1 hour and stirred uniformly. 30 g of the polymerization initiator mixture obtained according to the above method was gradually added to the mixed soluble silicate mixture for 1 hour to prepare a silicate composition and then the silicate composition was polymerized at a temperature of 90 캜 for 6 hours, Lt; / RTI > for a time to obtain a soluble silicate polymer.

(A2) Soluble Silicate Polymer: A soluble silicate polymer (A2) was prepared in the same manner as in the above (A1) except that 90 g of colloidal silica was added to the soluble silicate mixture and 40 g of the polymerization initiator mixture was added thereto while stirring. Respectively.

(A3) Soluble Silicate Polymer A soluble silicate polymer (A3) was prepared in the same manner as in (A1) except that 10 g of the polymerization initiator mixture was added to 90 g of sodium silicate having a molar ratio of SiO ₂ and Na ₂ O of 4.1: .

(A4) Soluble silicate mixture: 90 g of sodium silicate having a molar ratio of SiO ₂ and Na ₂ O of 4.1: 1, 20 g of lithium silicate having a molar ratio of SiO ₂ and Li ₂ O of 4.8: 1, and 20 g of potassium silicate having a molar ratio of SiO ₂ and K ₂ O of 4.1: Lt; RTI ID = 0.0 > 90g < / RTI > silicate.

(B) alcohol was used.

(C) Metal mixture: (C1) aluminum flake was used. (C2) zinc flakes were used. (C3) germanium oxide were used.

(D) Silane condensate: 90 g of 3-glycidoxypropyltrimethoxysilane was added to the reactor, and 10 g of a condensation initiator (N, N-dimethylethanolamine) was added thereto while stirring, and the mixture was stirred for 0.1 hour. Then, 100 g of deionized water was added and the mixture was stirred for 3 hours for condensation. The mixture was allowed to stand for 48 hours to prepare a silane condensate.

(E) Rare earth oxide: (E1) Yttrium oxide was used. (E2) europium oxide was used.

(F) Water: Deionized water was used.

(G) Additive: (G1) Dispersant was used. (G2) wetting agent was used. (G3) defoamer was used. (G4) leveling agent was used. (G5) anti-settling agent was used. (G6) thickener was used.

Example  1 ~ 3 and Comparative Example  1-5

(G5), a thickener (G6) and an alcohol (B) were added to the reaction vessel while stirring and stirring to disperse and swell the reaction mixture to prepare a paste mixture . Then, the soluble silicate polymer (A) was added and stirred at the content shown in the following Table 1, and then the silane condensate (D) was added thereto. Then, the dispersant (G1), the wetting agent (G2), the defoaming agent The leveling agent (G4) was added and stirred. Then, the metal mixture (C) and the rare earth oxide (E) according to the following Table 1 were charged and stirred for 3 hours to prepare a rust preventive paint composition.

Experimental Example

The anti-corrosive coating compositions of Examples 1 to 3 and Comparative Examples 1 to 5 were applied to a cold-rolled steel sheet and then dried to form a rust-preventive coating layer. Specifically, the cold-rolled steel sheet was subjected to first cleaning with an organic solvent (Xylene), followed by second cleaning with an alkaline degreasing agent, and then to a cold-rolled steel sheet panel for test, to which Examples 1 to 3 and Comparative Examples 1 to 5 (Coating and natural drying in an atmosphere of 10 캜) and room temperature (coating and natural drying in an atmosphere of 25 캜), respectively, and left for 7 days to prepare a test piece having a rust-preventive coating layer And the test pieces were subjected to the following test methods. The results are shown in Table 2 below.

(1) Storage stability test: The compositions of Examples 1 to 3 and Comparative Examples 1 to 5 were left to stand for 180 days, and then their viscosities were measured. The viscosity was measured by measuring the time (sec) required for the composition inside FORD CUP # 4 to flow out from the condition of 20 ° C, and the results are shown in Table 2 below.

(2) Anticorrosion test (saline spray exposure test): The test pieces of Examples 1 to 3 and Comparative Examples 1 to 5 were sprayed with a 5% by weight NaCl aqueous solution at 35 占 폚 according to KS D 9502 , And the state of the coating film after 1,000 hours was examined. The results are shown in Table 3 below.

(3) Adhesiveness and Interlayer Adhesion Test According to the ASTM D 3359 test method, scratches were made on the surface of the specimens of the Examples and Comparative Examples by a knife, the cellophane tape was closely adhered so that the untreated portions were evenly adhered, Was peeled off, and the peeled-off state of the area where the scratches were formed was visually compared and classified into 5B to 0B. The results are shown in Table 4 below. At this time, the 5B shows no peeling at all and 0B shows the completely peeled.

(4) Water resistance test: The specimens of Examples 1 to 3 and Comparative Examples 1 to 5 were immersed in fresh water for 1,000 hours, followed by visual observation of blooming, swelling, peeling and the like. ?: Normal, and X: defective. The results are shown in Table 4 below.

Fig. 1 is a graph showing a surface photograph of a specimen after the rustproofing test and 1000 hours after the rustproofing test, and the surface of the substrate surface from which the rust-preventive coating layer was removed, with respect to the specimens of Example 1, Example 2 and Comparative Example 5 It is a photograph comparing observation result. Referring to FIG. 1, it was found that the anti-corrosive effect of the rust-preventive coating layer of the present invention is much better than that of the comparative example 1.

2 and 3 are product recommendation documents related to the anticorrosive coating composition according to Example 2 of the present invention.

In addition, referring to the results of Tables 2 to 4, it can be seen that Examples 1 to 3 of the present invention are superior in adhesiveness and water resistance as compared with Comparative Examples 1 to 5.

In particular, as shown in the test results, the anti-corrosive coating composition according to the present invention is excellent in storage stability with little change for more than 6 months and can solve the problem of boiling or gelation at a certain time , And brine spray test. The coating composition according to the embodiment of the present invention can be used as a water-soluble anticorrosive paint for preventing rust from metal surface by silver (metallic silver) non-electrolytic thin film coating. And it was found.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

30 to 60% by weight of a soluble silicate polymer prepared by polymerizing at least one of sodium silicate, potassium silicate, lithium silicate, and colloidal silica;
More than 0 to 5% by weight of alcohol;
5 to 35% by weight of a metal mixture comprising aluminum, zinc and germanium oxide;
5 to 25% by weight of silane condensate;
0.1-10 wt% rare earth oxide; And
Water,
Wherein the metal mixture comprises aluminum, zinc and germanium oxide in a weight ratio of 1: 5 to 10: 2 to 5,
Wherein the rare earth oxide comprises yttria and europium in a weight ratio of 1: 2 to 1: 5.
The method of claim 1, wherein the soluble silicate polymer comprises heating the silicate composition comprising at least one of the sodium silicate, potassium silicate, lithium silicate, and colloidal silica, water and a polymerization initiator to 50 to 250 ° C By weight based on the total weight of the composition.
The anti-corrosive coating composition according to claim 1, wherein the soluble silicate polymer comprises the colloidal silica and at least one of the sodium silicate, potassium silicate, and lithium silicate in a weight ratio of 1: 1.5 to 1: 5.
delete delete The method of claim 1, wherein the silane condensate is prepared using a first mixture comprising a silane coupling agent, a condensation initiator and deionized water,
The silane coupling agent may be selected from the group consisting of 3-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl (methyl) 3-methacryloxypropyltrimethoxysilane, beta - (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, And N-propyltrimethoxysilane.
delete The anticorrosive coating composition according to claim 1, further comprising 0.01 to 15% by weight of an additive based on the total weight of the anti-corrosive coating composition,
Wherein the additive comprises at least one of a dispersant, a thixotropic agent, a plasticizer, a defoamer, a thickener, an anti-settling agent, an antioxidant, a light stabilizer, a wetting agent, a polymerizer and a pigment.
Applying an anti-corrosive coating composition according to any one of claims 1, 2, 3, 6 and 8 to a substrate surface; And
And curing the applied anti-corrosive coating composition to form a rust-preventive coating layer.
The method according to claim 9, wherein the thickness of the rust-preventive coating layer is 0.01 to 5 mm.

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