WO2008004368A1

WO2008004368A1 - Prefilter

Info

Publication number: WO2008004368A1
Application number: PCT/JP2007/058074
Authority: WO
Inventors: Taro Kuroda; Yoshio Okamoto; Masaru Nagato; Masahiko Maeda
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-07-05
Filing date: 2007-04-12
Publication date: 2008-01-10
Also published as: JP2008012418A

Abstract

A prefilter for air conditioners which comprises a prefilter net and, formed on the surface thereof, a specific fluoropolymer coating film rich in durability and excellent in cleanability. It is a prefilter for use in air conditioners which comprises a net made of a synthetic resin and has, on the surface of the net, a coating film obtained by applying a coating composition containing a fluoropolymer to the surface of the net and curing it. The coating composition is a cold-setting coating composition comprising a fluoropolymer having a functional group (X), an antifouling ingredient, and a curing agent, wherein the antifouling ingredient is a liquid polydialkylsiloxane having a functional group reactive with the functional group (X) or with the curing agent or is a liquid fluoropolyether having a functional group reactive with the functional group (X) or with the curing agent.

Description

Specification

Pre-filter technology

[0001] The present invention relates to a prefilter used for an air conditioner such as an air conditioner or an air purifier.

Background art

[0002] Pre-filters that have net power are provided at the air suction locations of air conditioners such as air conditioners and air purifiers so that dust and dirt in the air are not taken into the air conditioner. Yes. This prefilter is usually composed of a synthetic resin net and a support frame.

[0003] Indoor dust and dirt include insoluble dust such as cotton dust, sand dust, mud and cigarette smoke, water-soluble dirt such as cigarette char, oil-soluble dirt such as oil smoke and soot. There is a wide variety, and the deposits attached to the prefilter are in a composite form. Such attached dirt changes due to light and oxygen in the air, and it becomes more difficult to remove.

[0004] In addition, the pre-filter captures what does not pass through the hole due to the size of the mesh (mesh), but there are fine dirt (such as cigarette smoke, soot and dust) in the air. In order to collect the dust, the net is charged and captured electrically. As one of the methods, it has been proposed that the outer surface of the fiber constituting the net is coated with fluorine resin having a high chargeability, and it is described that it can be washed with water (Japanese Patent Laid-Open No. 08-22). 4413, JP 08-224414).

[0005] Furthermore, Japanese Patent Laid-Open No. 2006-122871 proposes coating with fluorine resin using a noinder or the like to prevent adhesion of oil-containing dust! RU

[0006] In Japanese Patent Application Laid-Open No. 08-224413 and Japanese Patent Application Laid-Open No. 08-224414, there is only a description of coating with fluorine resin, and a specific solution is shown. It has not been.

[0007] For example, in order to form a film of fluorine resin, a force that usually requires firing at a high temperature The ability to form a fluororesin film on a prefilter made of a synthetic resin that has less heat resistance than fluororesin. Instructions required for implementation, such as what type of fluororesin is used. There is no.

[0008] Furthermore, in general, fluorine resin does not adhere well to other synthetic resins. Simply attaching fluorine resin does not cause frequent detachment, brushing or wiping, and peeling. There is a problem with durability.

[0009] Also, in Japanese Patent Application Laid-Open No. 2006-122871, only the word “fluorine resin” is described, and since a binder is separately required, the resin particles are bonded to the synthetic resin of the prefilter mesh. It is assumed that a film is formed by dispersing in a binder!

[0010] However, it is difficult to effectively utilize the effect of fluorine resin in such a dispersion film of fluorine resin particles, and fluorine resin does not have good adhesion to a binder, so that the particles of fluorine resin particles fall off. Will also occur, and the durability will remain a problem.

Disclosure of the invention

[0011] The subject of the present invention is a coating film of a specific fluorine-containing polymer which is rich in durability on the surface of the mesh and excellent in decontamination even if it is a prefilter made of the same material as a conventional prefilter. An object of the present invention is to provide a prefilter for an air conditioner in which is formed.

[0012] The present invention is a prefilter for an air conditioner having a synthetic resin mesh, wherein a coating composition containing a fluorine-containing polymer on a part or all of the surface of the mesh is applied to the surface of the mesh. A coating composition comprising a film obtained by curing, comprising the fluorine-containing polymer, comprises (A) a fluorine-containing polymer containing a functional group X, (B) an antifouling component, and (C) a curing agent. a combination formed thereof, antifouling component (B) is (B1) the functional group X and Z, or a liquid polydialkylsiloxane having functional group Y ¹ that obtained reacts with a curing agent (C) or (B2) functional, The present invention relates to a prefilter which is a room temperature curable coating composition, which is a liquid fluoropolyether having a functional group Y ² capable of reacting with groups X and Z or a curing agent (C).

Brief Description of Drawings

FIG. 1 is a schematic perspective view of a prefilter for an air conditioner according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION [0014] The prefilter for an air conditioner having a synthetic resin net of the present invention is coated with a coating composition containing a specific fluorine-containing polymer on a part or all of the surface of the net and cured. It is characterized by the fact that it has a coating obtained by heating.

[0015] The coating composition containing the fluorine-containing polymer is a composition comprising (A) a fluorine-containing polymer containing a functional group X, (B) an antifouling component, and (C) a curing agent. Component (B) is a liquid polyalkylsiloxane having a functional group Y ¹ that can react with (B1) functional groups X and Z or a curing agent (C), or (B2) functional groups X and Z or a curing agent (C) Is a cold-curing coating composition which is a liquid fluoropolyether having a functional group Y ² capable of reacting with

[0016] In this coating composition, the deviation of the fluorine-containing polymer (A) and the antifouling component (B) is water and oil repellency, and the formed film is also water and oil repellency.

[0017] By making the surface of the prefilter water and oil repellent, both water-soluble dirt and oily dirt are attached to the dust side, and relatively large dust is removed, so that not only dust but water-soluble dirt and oil are removed. Even sexual stains can be removed. The reason for this is not clear, but in general the main components of dust are cotton dust composed of various fibers and sand dust composed mainly of silicic acid, iron oxide, aluminum oxide, etc. From the viewpoint of water repellency and oil repellency. Both are intermediate properties. At that time, if the surface of the prefilter is made to be water repellency and oil repellency, even if it is in a very high state (water and oil repels), water-soluble dirt will be more dusty than the surface of the prefilter because of its water repellency. Adheres to the side and adheres to dust. The same oily soil adheres to the dust side of the prefilter surface and adheres to the dust because of the oil repellency of the prefilter surface.

[0018] In the present invention, the water / oil repellency of the coating refers to the property that both the water contact angle and the oil contact angle of the coating surface are high. Specifically, a film having a water contact angle of 80 degrees or more and an oil contact angle of 35 degrees or more means that both water-soluble dirt and oil-soluble dirt have an affinity for the film. Poor (without adhering to the coating), therefore point power absorbed by cotton dust and sand dust is preferable. The method for measuring the water contact angle and the oil contact angle will be described later.

[0019] A more preferable contact angle with water is 90 ° or more, particularly 100 ° or more, because the aqueous soil adhesion preventing property is further excellent. [0020] A more preferable oil contact angle is 45 ° or more because oil stain adhesion prevention is further excellent.

In the coating film of the present invention, the antifouling component (B) is firmly bonded to the fluoropolymer (A) via the curing agent (C) by the function (reaction) of the functional group. Therefore, the antifouling component (B) does not fall off from the coating film, and it is rich in durability.

[0022] Examples of the coating composition containing a strong fluorine-containing polymer include International Publication No. 2004/0.

The paint composition described in the 67658 pamphlet can be illustrated with specific examples and preferred ranges.

[0023] Among them, a prefilter for a resin product such as an air conditioner for adjusting indoor air has a hydroxyl group, a force as the functional group X of the fluoropolymer (A) of the coating composition. A ruboxyl group and Z or epoxy group are preferable in terms of curability and adhesion to a prefilter net.

[0024] Further, as the antifouling component (B), the functional group Y ¹ polydialkylsiloxane (B1) is included in the force preferred instrument polydialkylsiloxane repellency good point (B1), a hydroxyl group, § Mino Group and Z or epoxy base force are preferable from the viewpoint of good curability and adhesion to a prefilter net.

[0025] As the curing agent (C), isocyanate compounds, amino compounds and Z or epoxy compounds are preferable in terms of curability and good adhesion to the prefilter net.

Among these, in particular, the functional group X of the fluorine-containing polymer (A) is a hydroxyl group, and the functional group Y ¹ or Y ^{2 of} the antifouling component (B) is a hydroxyl group or an amino group, and the curing agent (C) Strength The coating composition strength which is a S isocyanate compound, in particular, a point strength which is excellent in curability and adhesion of the prefilter to the net is also preferable.

[0027] Specific preferred examples of the fluorine-containing polymer (A) include tetrafluoroethylene (TFE) Z alkyl butyl ether Z hydroxybutyl butyl ether (HBVE) copolymer, TFEZ alkyl butyl ester ZHBVE Copolymers, Black-mouthed Trifluoroethylene (CTFE) Z Alkyl Bulle Ether ZHBVE Copolymer, TFEZ Alkyl Bulle Ether Z Maleic Acid Copolymer, CTFEZ Alkyl Bulle Ether Z Maleic Acid Copolymer But is not limited to these . Of these, TFEZ alkyl butyl ether ZHBVE-based copolymer, TFEZ alkyl vinyl ester ZHBVE-based copolymer strength are also preferred because of their excellent antifouling properties, oil resistance, and curing agent compatibility.

[0028] Among the antifouling components (B), polydialkylsiloxane (B1) is preferred U. Specific examples include, for example, amino-modified polydialkylsiloxane, carbinol-modified polydialkylsiloxane, carboxyl-modified polydialkylsiloxane, Examples thereof include epoxy-modified polydialkylsiloxane, and particularly, amino-modified polydialkylsiloxane power and point power with good curability are also preferable.

[0029] Specific examples of the liquid fluoropolyether (B2) having the functional group X ² and the functional group Y ² capable of reacting with the curing agent (C) among the antifouling component (B) include, for example, a hydroxyl group And fluoropolyethers having amino groups, epoxy groups, carboxyl groups, thiol groups, nitrile groups, iodine atoms and Z or hydrolyzable alkyl silicate residues.

[0030] As described above, polydialkylsiloxane (B1) is preferred as the antifouling component (B).

[0031] The blending amount of the antifouling component (B) is 0.001 part by mass or more, further 0.01 part by mass or more, particularly 0.1 part by mass with respect to 100 parts by mass of the solid content of the fluoropolymer (A). Part by mass or more is preferable. If the amount is too small, the effect of preventing contamination and removal will be insufficient. The upper limit is 30 parts by mass, even 10 parts by mass, especially 3 parts by mass. If the amount is too large, it will be difficult to form a uniform coating film, and it will be necessary to take into account that stickiness will be generated. .

[0032] Specific examples of the curing agent (C) include, for example, isocyanate compounds, amino compounds and epoxy compounds, and the functional group X which the fluorine-containing polymer (A) and the antifouling component (B) have, Select appropriately in relation to Y ¹ and Y ² .

[0033] The isocyanate compound-based curing agent is effective when the functional groups X, Y ¹ and Y ^{2 of the} fluorine-containing polymer (A) and the antifouling component (B) are a hydroxyl group and Z or an amino group. It is. Isocyanate compounds include block isocyanate compounds, such as 2,4-tolylene diisocyanate, diphenylmethane 4,4'-diisocyanate, xylylene diisocyanate. Cyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, methylcyclohexyl diisocyanate, trimethylhexamethylene di Sulfonate, hexamethylene diisocyanate, n-pentane 1,4-diisocyanate, trimers thereof, adducts, biuret, polymers having two or more isocyanate groups, Powers such as lysine triisocyanate (specifically 2-isocyanatoethyl 2,6 diisocyanate hexanoate, etc.) and blocked isocyanates are not limited to these! /.

[0034] Further, an isocyanate compound having a hydrolyzable alkyl silicate residue can also be preferably used. As a specific example, for example, OCNC H Si (OCH)

3 6 3 3, OCNC H Si (OC H

3 6 2

), OCNC H Si (OCOCH), OCNC H Si (CH) (OCH), and the like.

5 3 3 6 3 3 3 6 3 3 3

[0035] The mixing ratio of the isocyanate compound and the fluoropolymer (A) is NCOZOH (molar ratio) of 0.5 to 5.0 force S, more preferably 0.8 to 1.5. When the isocyanate is a moisture-curing type, 1.1 to 1.5 is preferable.

[0036] The amino compound-based curing agent is effective when the functional groups X, Y ¹ and Y ^{2 of the} fluorine-containing polymer (A) and the antifouling component (B) are a carboxyl group, an amino group or an epoxy group. is there. Preferable specific examples include melamine resin, urea resin, guanamine resin, amine adduct, polyamide and the like.

[0037] Commercially available products include: Cymel (trade name) manufactured by Mitsui Cytec Co., Ltd .; Ancamine (trade name) manufactured by Air Products, Epilink (trade name); Versamine (trade name) manufactured by Henkenore, Samide (trade name); Tomide (trade name) manufactured by Fuji Kasei Kogyo Co., Ltd., Fuji Cure I (trade name); Versamide (trade name) manufactured by Daiichi General Co., Ltd .; Epicure manufactured by Japan Epoxy Resin Co., Ltd. 1 (trade name); Sanmide (trade name) manufactured by Sanwa Chemical Co., Ltd .; Epomate (trade name) manufactured by Ajinomoto Co., Inc.

[0038] The epoxy compound curing agent is effective when the functional groups X, Y ¹ and Y ^{2 of the} fluorine-containing polymer (A) and the antifouling component (B) are a carboxyl group, an amino group or an epoxy group. It is fruitful. Examples include epoxy resin and epoxy-modified silane coupling agents. Commercially available products include Epoxy Coat (trade name) and Epilec (trade name) manufactured by Japan Epoxy Resin Co., Ltd .; Name); Coat Gil 1770 (trade name), A-187 (trade name), etc., manufactured by Nippon Tunica Co., Ltd.

[0039] The compounding amount of the curing agent (C) depends on the functional groups X, Y ¹ and fluorine-containing polymer (A) and antifouling component (B). Assuming that the total equivalent of ² is 1, it is preferably 0.3 equivalents or more, more preferably 0.5 equivalents or more, and particularly preferably 0.8 equivalents or more. If it is too low, curing will be insufficient. The upper limit is 4 equivalents, even 2 equivalents, especially 1.5 equivalents. If the amount is too large, it will be necessary to consider such points as uniform formation of curing and increased tackiness.

[0040] The coating composition used in the present invention is particularly preferably curable at room temperature (room temperature curable). By making it room temperature curable, an antifouling coating can be formed without degrading the synthetic resin of the prefilter mesh. If it is up to the heat resistance temperature of the synthetic resin that is the prefilter mesh material, it can be heated and cured.

[0041] The coating composition used in the present invention may contain various other additives! / ヽ. Typical additives include antibacterial agents, photocatalysts, antistatic agents, pigments, pigment dispersants, thickeners, repelling agents, antifoaming agents, film-forming aids, UV absorbers, anti-foaming agents, fillers, Colloidal silica, fungicides, silane coupling agents, anti-skinning agents, antioxidants, flame retardants, anti-sagging agents, anti-fungal agents, water-soluble grease (polyvinyl alcohol, polyethylene oxide, etc.), preservatives, anti-freezing Additives for paints such as agents may be mentioned, and they may be combined within a range that does not impair the effects of the present invention.

[0042] As the form of the coating composition, whether it is an aqueous dispersion type coating composition or a solvent type coating composition, a solvent type coating composition is preferred because of its good drying property.

[0043] In the case of a solvent-type coating composition, examples of organic solvents include hydrocarbon solvents such as xylene and toluene; ester solvents such as methyl acetate, ethyl acetate, and butyl acetate; ethylene glycol monomethyl ether acetate, propylene acetate Ether solvents such as glycol monomethyl ether, propylene glycol monobutyl ether, diethylene glycol dibutyl ether and tetrahydrofuran; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone and acetone; Ν, Ν-dimethylacetamide, Ν-methy Amide solvents such as lucacetamide, acetoamide, Ν, Ν-dimethylformamide, Ν, Ν-jetylformamide, Ν-methylformamide; alcoholic solvents such as methanol, ethanol, isopropanol ; Dimethyl sulfoxide can be exemplified. Of these, butyl acetate, propylene glycol monomethyl ether acetate, propylene glycol monobutyl ether acetate, methyl ethyl ketone power Is preferable.

[0044] The solid content concentration of the coating composition is usually 1% by mass or more, preferably 10% by mass or more, and 80% by mass or less, more preferably 50% by mass or less.

[0045] As a synthetic resin constituting the prefilter net, currently used polypropylene is used.

Polyethylene, polyamide, polyvinyl chloride, polyester (eg polyethylene terephthalate (PET)), polysalt vinylidene, etc.

[0046] Specific examples of combinations of the fluorine-containing polymer (A), the antifouling component (B), the curing agent (C), and the optional component (D) in the coating composition are particularly preferred below. Is not limited to these.

[0047] Coating composition 1

Fluoropolymer (A): Hydroxyl-containing fluoroolefin resin

Antifouling component (B): Polydialkylsiloxane containing amino groups

Curing agent (C): Hydrolyzable alkyl silicate residue-containing isocyanate (or polyisocyanate if necessary)

Additive (D): Dibutyltin dilaurate (DBTDL) (optional)

Paint form: Solvent type (Solvent: Peptyl acetate, Methyl ethyl ketone, Methyl isobutyl ketone, Propylene glycol monobutyl ether acetate, etc.)

Prefilter mesh material: Polyester (especially PET)

[0048] Coating composition 2

Fluorine-containing polymer (A): Blend of fluoroolefin resin and hydroxyl group-containing non-fluorinated resin

Antifouling component (B): Polydialkylsiloxane containing amino groups

Curing agent (C): Polyisocyanate

Additive (D): Dibutyltin dilaurate (DBTDL) (optional)

Prefilter mesh material: Polyester (especially PET)

[0049] Coating composition 3 Fluoropolymer (A): Hydroxyl-containing fluoroolefin resin

Antifouling component (B): Polydialkylsiloxane containing amino groups

Curing agent (C): Amino compound

Additive (D): p-toluenesulfonic acid

Prefilter mesh material: Polyester (especially PET)

[0050] Coating composition 4

Resin (A): Carboxyl group-containing fluororefin resin

Antifouling component (B): Polydialkylsiloxane containing amino groups

Curing agent (C): Amino compound

Additive (D): Dibutyltin dilaurate (DBTDL) (optional)

Prefilter mesh material: Polyamide

[0051] The prefilter of the present invention is a prefilter for an air conditioner. Air conditioners include air conditioners, air purifiers, dehumidifiers, humidifiers, and exhaust fans, regardless of whether they are for home use or business use.The shape and size of each air conditioner depends on the manufacturer and model. However, basically, as shown in a schematic perspective view in FIG. 1, the support frame 1 and the mesh 2 are composed of the synthetic resin fibers 3 which are integrated. Of course, a woven fabric of fibers 3 may be used, but warps and wefts may be displaced, and the fibers are bonded to each other by heat or an adhesive.

[0052] Various prefilter shapes can be employed in consideration of dust collection, pressure loss reduction, cleaning, cleaning frequency, and the like. For example, as a method of weaving a net, a solid weave has relatively fine eyes (easy to remove fine dust), and even if dust is collected, pressure loss does not increase easily (requires less frequent cleaning). In recent years, the plain weaving type has come to be used in recent years.

[0053] The mesh opening (mesh) varies depending on the type, model, application, form, etc. of the air conditioner to be applied. For home air conditioners, it is usually 25-80 mesh (about 250 m to about lmm) ) It is.

[0054] The prefilter used in the present invention can be provided in accordance with a known prefilter which may be plain weave, solid weave, turtle shell weave, spiral weave, or with or without pleats.

[0055] Spray coating, dating coating, roll coating, and the like can be used as a method for applying the prefilter to the net, and an appropriate method may be employed depending on the shape, size, material, and the like of the prefilter. Further, a primer paint may be applied in advance.

[0056] After coating, the coating is dried to promote curing with a curing agent. Curing may be heated, but as described above, leaving at room temperature is preferable from the viewpoint of preventing the deterioration of the net.

[0057] The film thickness to be formed is usually 0.1 μm or more, further 1 μm or more, particularly 2 m or more. 50 m or less, 30 m or less, especially 10 m or less, which is preferable because it is easy to be absorbed by sand dust), to prevent clogging of the filter during painting and to reduce pressure loss In addition to controlling the increase in paint, it also reduces paint costs (does not use paint more than necessary) and paint costs (does not apply more than necessary and does not require drying time) U, preferred to prevent peeling.

[0058] The coating may be the entire surface of the mesh (continuous coating) or part (discontinuous coating)! / ヽ. Considering that the prefilter is flexible and deforms when handled, it is preferable to make it a part (discontinuous coating) because it does not cause cracking of the coating. In order to form a discontinuous film, for example, a method that uses a low affinity for synthetic resin for the mesh as a solvent for the coating composition, a method that devises the coating method (spray, gravure coating, etc.), etc. is there.

[0059] Further, in order to improve wiping properties, it is desirable to impart lubricity to the surface of the coated net. Good slipperiness means that the drop angle of water drops measured by the drop angle measurement method is 50 degrees or less, and that of hexadecane oil drops is 10 degrees or less. In order to increase the water slidability, for example, a method of forming appropriate irregularities on the surface of the coated net can be exemplified.

[0060] The sliding angle is measured by forming a coating film on the substrate and measuring the falling angles of water and hexadecane with a contact angle measuring device. [0061] Depending on the coating method, the coating composition may remain in the meshes and the meshes may be crushed. If the clogging is excessive, the filter function is impaired and the pressure loss is increased. The degree of clogging is preferably 1Z3 or less, more preferably 1Z10 or less of the total number of meshes. In addition, good dust collection and suppression of pressure loss, and point power that does not easily damage the filter appearance are preferable.

[0062] The specific fluorine-resin coating formed on the surface of the pre-filter net by force removes oil-smoke such as cigarette jars and oil-soluble dirt such as soot. It is easy to wash with water and can be easily removed regardless of oily water, and it has excellent strength and adhesion to the net. It is durable enough to withstand use.

[0063] As described above, the synthetic resin, which has been difficult to surface-treat with fluorine resin, has been described as a prefilter net material. However, the coating composition used in the present invention is, of course, a metal. It can also be applied to heat-resistant prefilters such as glass fiber and ceramic fiber.

[0064] Metals and ceramics that make up the pre-filter mesh include stainless steel (SUS304, SUS31 6, SUS316L, SUS430, SUS310S, etc.), nickel, monel, brass, red copper, phosphor bronze, copper, iron, zinc-drawn iron wire Examples thereof include metal fibers such as steel, aluminum, titanium, nichrome, hastelloy, and inconel, and ceramics such as acid aluminum, acid zirconium, my strength, silicon nitride, glass, PZT, graphite, and carbon fiber.

Example

[0065] Next, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.

[0066] Example 1

ZEFLEL GK-510 (Hydroxyl-containing tetrafluoroethylene copolymer. Hydroxyl value 60mgKOH, g, Acid value 9mgKOH, g, Number average molecular weight 12000, Fluorine content 36% by mass, 100 parts by weight of refractive index 1.4, butyl acetate solution, solid content 50% by weight, and amino group-containing silicone oil (NUC SILICON E FZ3705 (trade name) as antifouling component (B). Amino-modified silicone oil, viscosity 230 mm ² Zs, amino equivalent 4000) 1 part by weight, coronate HX (trade name) as a hardener (C) 12 parts by mass of this isocyanate (isocyanate-based curing agent) and 2 parts by mass of a 1% butyl acetate solution of dibutyltin dilaurate (DBTDL) as a curing accelerator, and butyl acetate as a diluent. Mass parts and 30 parts by mass of propylene glycol monobutyl ether acetate were blended to prepare a coating composition having a solid concentration of 20% by mass.

[0067] This paint composition is spray-coated on the next prefilter by a conventional method, and after applying compressed air to the filter to eliminate clogging, it is baked at 100 ° C for 10 minutes, dried and cured. A fluororesin film was formed on the surface of the film to prepare Prefilter 1 of the present invention.

[0068] (Prefilter specification)

Support frame: Made of polypropylene

Net: Made of PET

Mesh opening (mesh): vertical 50 mesh, horizontal 35 mesh

Net fiber diameter: 75 denier

Dimensions: Length 355mm, width 400mm

[0069] Clogging of the obtained prefilter 1 was 1% of the whole according to microscopic observation.

Next, the water contact angle and the oil contact angle of the prefilter 1 and the base material (PET) of the prefilter before forming the coating (comparative prefilter) were examined. Since the contact angle of the pre-filter itself cannot be measured, the contact angle between the PET sheet on which the fluororesin film was formed and the PET sheet before the film formation was measured in the same manner as described above. As a result, the water contact angle of the PET sheet (corresponding to prefilter 1) on which the fluorine resin film was formed was 103 degrees, and the oil contact angle was 50 degrees. The PET sheet (corresponding to the prefilter for comparison) before film formation had a contact angle with water of 80 degrees, and the contact angle with oil was 15 degrees.

[0071] (Water contact angle)

Using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd.), measure the contact angle of pure water at a volume of 2 w 1. Measure 1 second after placing the solution.

[0072] (Oil contact angle)

Using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd.) V, measure the contact angle at a liquid volume of 2 µ 1 with a liquid paraffin viscosity of 70 cSt. To stabilize the solution, measure 10 seconds after placing the solution.

[0073] Further, as a result of performing a bending endurance test on the prefilter 1, it was confirmed that the prefilter 1 was bent 10 times. However, the film that had fallen off was almost entirely damaged.

[0074] (Bending durability test method)

Bending the prefilter 180 degrees and then bending it 180 degrees in the opposite direction is one cycle and repeated 10 cycles. Then, the bent part is visually observed to visually check for the presence or absence of sag.

[0075] Next, the pre-filter 1 and the pre-filter (comparative pre-filter) before forming the coating are each attached to an air conditioner installed on the upper part of the wall of a smoking room having a floor area of about 15 m ² .

After running for 1 month, it was removed and subjected to a cleaning test.

[0076] (Cleaning test method)

Apply water to the kitchen sink and wipe it back and forth twice using gauze.

. The evaluation is performed by visually checking the dirt state before and after wiping.

As a result, in the prefilter 1 of the present invention, the tobacco dirt was removed to the same extent as when it was attached, and the dirt became almost unaltered. Dirt was hardly removed.

Industrial applicability

[0078] According to the prefilter for an air conditioner of the present invention, a coating film containing a fluorine-containing polymer having excellent adhesion to a synthetic resin can form a film on the surface of the net, and the prefilter surface is rubbed. In addition, it is possible to provide a pre-filter that is highly durable against removal work and washing with water that does not fall off even if the pre-filter is bent.

Claims

The scope of the claims

[1] A prefilter for an air conditioner having a net made of a synthetic resin, which is obtained by applying a coating composition containing a fluorine-containing polymer to a part or all of the surface of the net and curing it. The coating composition is a composition comprising (A) a fluorine-containing polymer containing a functional group X, (B) an antifouling component, and (C) a curing agent. Component (B) is a liquid polyalkylsiloxane having a functional group Y ¹ that can react with (B1) functional groups X and Z or a curing agent (C), or (B2) functional groups X and Z or a curing agent (C) Prefinoleta, which is a room temperature curable coating composition, which is a liquid fluoropolyether having a functional group Y ² capable of reacting with.

[2] The prefilter according to claim 1, wherein the functional group X of the fluoropolymer (A) is a hydroxyl group, a carboxyl group, Z or an epoxy group.

[3] The functional group Y ^{1 of the} polydialkylsiloxane (B1) has a hydroxyl group, an amino group, and

The prefilter according to claim 1 or 2 which is Z or an epoxy group.

[4] The prefilter according to any one of claims 1 to 3, wherein the curing agent (C) is an isocyanate compound, an amino compound, and Z or an epoxy compound.

[5] The functional group X of the resin (A) is a hydroxyl group, the functional group Y ¹ or Y ^{2 of} the antifouling component (B) is a hydroxyl group or an amino group, and a curing agent (C) is isocyanate. The prefilter as set forth in claim 1, which is a compound.

[6] The first to fifth aspects of the invention wherein the room temperature curable coating composition further contains an antibacterial agent! The prefilter according to any one of the above.

[7] The first to sixth aspects of the invention, wherein the room temperature curable coating composition further contains a photocatalyst! The prefilter according to any one of the above.

[8] The prefilter according to any one of [1] to [7], wherein the synthetic resin constituting the net is polypropylene, polyethylene, polyamide, polysalt bule or polysalt biureidene.

[9] The prefilter according to any one of claims 1 to 8, which is a prefilter for an air conditioner.

[10] The prefilter according to any one of claims 1 to 8, which is a prefilter for an air cleaner. Prefilter,