JP2003049111A - Stain-resistant mat coating composition and method for forming mat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both a stain-resistant mat coating composition capable of affording a mat film exhibiting excellent stain-resistant properties and a method for forming the mat film. SOLUTION: This stain-resistant mat coating composition comprises a hydroxy group-containing fluorine-containing resin, a polyisocyanate compound and a silicate compound, silica particles and resin particles and the total amount of the silica particles and resin particles is 0.1-200 wt.% based on the coating solids. The method for forming the mat film is characterized by coating a substrate with the stain-resistant mat coating composition and forming the mat film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stain-resistant matte coating composition capable of forming a matte coating film excellent in stain resistance and a method for forming a matte coating film.

[0002]

2. Description of the Related Art A method for forming a coating film having excellent stain resistance by incorporating a silicate compound into a coating material is being developed. These methods are disclosed, for example, in WO94 / 06870, WO96 / 262458, and Kaihei 10-7
It is described in Japanese Patent No. 2569. The stain resistance of such a coating film is exhibited when the silicate compound localized on the surface undergoes a hydrolysis reaction to generate silanol and the coating film surface becomes hydrophilic.

By the way, in order to obtain a calm textured appearance, architectural paints have a matte coating film of 5 to 3 minutes having a 60-degree gloss value of 50 or less, or a completely matte coating such as 10 or less. May be desired. In general, architectural paints for obtaining such a matte appearance are generally used in combination with silica particles and an extender pigment such as calcium carbonate.

However, when such a silica particle and an extender pigment are used for a paint exhibiting stain resistance, the surface roughness of the coating film becomes large, so that the apparent water contact angle becomes large. Therefore, there is a problem that the stain resistance is lowered.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a stain resistant matte coating composition and a method for forming a matte coating film, which enables a matte coating film exhibiting excellent stain resistance to be obtained. .

[0006]

The present invention comprises a hydroxyl group-containing fluorine-containing resin, a polyisocyanate compound and a silicate compound, and silica particles and resin particles, wherein the total amount of the silica particles and resin particles is a coating solid. The stain-resistant matte coating composition is characterized by being 0.1 to 200% by weight based on the amount. here,
The weight ratio of silica particles to resin particles is 1 / 0.1 to 1
It is preferably /3.0.

Further, the silica particles are preferably hydrophobic silica particles. Further, the resin particles are preferably crosslinked resin particles, and more preferably crosslinked acrylic resin particles.

The present invention is a method for forming a matte coating film, which comprises applying the stain resistant matte coating composition to a substrate to form a matte coating film. Further, it is preferable that the 60 degree gloss value of the obtained coating film is 50 or less.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The stain resistant matting coating composition of the present invention contains a hydroxyl group-containing fluorine-containing resin, a polyisocyanate compound and a silicate compound, and silica particles and resin particles. Examples of the hydroxyl group-containing fluororesin include fluoroolefin copolymers. The hydroxyl value of the resin solid content of the fluoroolefin copolymer is not particularly limited, but it is 20 to 20 from the viewpoint of curability and flexibility of the coating film obtained.
It is preferably 0, and more preferably 30 to 150. The number average molecular weight is not particularly limited, but from the viewpoint of curability, weather resistance and coating workability, it is preferably 1,000 to 100,000,
It is more preferably 1500 to 30000. The number average molecular weight is GPC (gel permeation
It can be measured and determined by a method well known to those skilled in the art, such as chromatography).

Commercially available fluoroolefin copolymers such as these are the Zeffle series (manufactured by Daikin Industries, Ltd.), Lumiflon series (manufactured by Asahi Glass Co., Ltd.), Cefral Coat series (manufactured by Central Glass Co., Ltd.) Nate series (manufactured by Dainippon Ink and Chemicals, Inc.), Zaflon series (manufactured by Toagosei Co., Ltd.), and the like.

Specific examples of the polyisocyanate compound include 2,4-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate,
Diisocyanates such as xylylene diisocyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, methylcyclohexyl diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene diisocyanate, n-pentane-1,4-diisocyanate, norbornene diisocyanate, and trimers thereof, for example, Isocyanurates, adducts, burettes, polymers of these polymers having two or more isocyanate groups, triisocyanates such as lysine triisocyanate, and blocking of these isocyanate groups with alcohols or oximes You can list the things that you did.

The content of the polyisocyanate compound in the stain resistant matting coating composition of the present invention is determined from the viewpoint of the curability and performance of the coating film obtained and the hydroxyl groups contained in the hydroxyl group-containing fluororesin and the polyisocyanate compound. Molar ratio with the isocyanate group of (OH / N
CO) is preferably 2.0 to 0.2 and 1.3
It is more preferable that the value is ˜0.7.

The above silicate compound has the general formula (1):

[0014]

[Chemical 1]

A compound and / or condensate represented by: The above n represents the degree of polymerization and is an integer of 1 to 100. From the viewpoint of volatilization and resin handling, 2
It is preferably -100 and more preferably 4-20. When n is 2 or more, examples of the shape of the silicate compound include a straight chain, and shapes other than the above formula include a branched chain, a ring, and
Examples thereof include three-dimensional polymers.

In the formula, R ¹ is the same or different,
Any of which is an organic group having 1 to 9 carbon atoms, which may contain a nitrogen atom, an oxygen atom, a fluorine atom and / or a chlorine atom,
Alternatively, it is a hydrogen atom, and from the viewpoint of dispersion stability and hydrolyzability, an organic group having 1 to 6 carbon atoms is preferable. When the number of carbon atoms is out of the above range, the dispersion stability is lowered, or the stain resistance of the obtained coating film is lowered.

Specifically, as such, Si
(OCH ₃ ) ₄ , Si (OC ₂ H ₅ ) ₄ and condensates and co-condensates thereof, etc. may be mentioned. Commercially available products include MKC silicate MS56 and MKC silicate MS51 (all are manufactured by Mitsubishi Chemical Corporation. Examples thereof include methyl silicate compound manufactured by Mitsui Chemical Co., Ltd.) and ethyl silicate 40 (ethyl silicate compound manufactured by Colcoat Co., Ltd.). Further, the organic group of these alkyl silicates may be partially substituted with the alcohol compound having R ¹ described above.

Specific examples of the alcohol compound include propyl alcohol, isopropyl alcohol, n
Examples thereof include alkyl alcohols such as -butyl alcohol and sec-butyl alcohol, and ether alcohols such as butyl cellosolve, methoxypropanol and ethoxypropanol.

From the viewpoint of the stain resistance of the obtained coating film,
R above¹At least one of which contains a fluorine atom
It is preferable that all R¹Contains a fluorine atom
More preferably, Such a silicate
In compounds, its stability and stain resistance of the resulting coating
From the viewpoint of¹Specifically, CH₂-C
F₂-R or CH₂CH₂-CF₂-R (In the formula, R is a nitrogen source
Child, oxygen atom, fluorine atom and / or chlorine atom
Is an organic group or hydrogen atom which may be present)
And R is preferably 1 to 3 carbon atoms.
preferable. Specifically as such, CH₂C
F₃, CH₂CF₂CF₃, CH₂(CF₂)₂CF ₃, CH₂
CH₂(CF₂)₃CF₃, CH₂(CF₂)₂H, CH₂(C
F₂)₃H, CH ₂(CF₂)_FourH can be mentioned
It

When R ¹ contains a fluorine atom,
The content of fluorine atoms contained in the silicate compound is preferably 15% by weight or more, more preferably 30 to 50% by weight. If the content is less than 15% by weight, the resulting coating film may have insufficient stain resistance.

Examples of the above-mentioned fluorine atom-containing silicate compound include Si (OCH ₂ CF ₂ CF ₃ ) ₄ Si (OCH (CF ₃ ) ₂ ) ₄ Si (OCH ₂ CF ₂ CF ₂ H) ₄ Si (OCH ₂ C _{4 F 8 H) 4 Si (} OCH 2 CF 2 CF 3) 2 (OCH 3) 2 Si (OCH (CF 3) 2) 2 (OCH 3) 2 Si (OCH 2 CF 2 CF 2 H) 2 (OCH 3 ) ₂ Si (OCH ₂ CF ₂ CF ₃ ) ₂ (OH) ₂ and its condensates and co-condensates can be mentioned, and as the commercially available products, there are Zefle GH110 (manufactured by Daikin Industries, Ltd., containing a fluorine atom). Examples thereof include silicate compounds).

The content of the silicate compound in the stain resistant matting coating composition of the present invention is 0.1 with respect to 100 parts by weight of the resin solid content of the hydroxyl group-containing fluororesin.
To 80 parts by weight, preferably 1 to 50 parts by weight. When the content is less than 0.1 part by weight, the resulting coating film may have insufficient stain resistance, and when it exceeds 80 parts by weight, the curability and appearance of the obtained coating film may be deteriorated. There is a fear.

The stain resistant matte coating composition of the present invention comprises:
It contains silica particles and resin particles. The silica particles are not particularly limited, and specific examples thereof include hydrated amorphous silicon dioxide generally called white carbon. The weight average particle diameter of such silica particles is preferably 1.5 to 4.5 μm.
More preferably, it is 7 to 3.5 μm. 1.5μ
If it is less than m, the coating film obtained may not be matte, and if it exceeds 4.5 μm, the stain resistance of the coating film obtained may be reduced. Further, the amount of di-n-butylamine (DBA) adsorbed on the silica particles is 60.
It is preferably below mmol / kg, and 40 mmo
It is more preferably 1 / kg or less. Such silica particles are hydrophobic silica particles having a hydrophobic surface. For example, a method of treating the surface of the silica particle with silicone oil, particularly dimethylpolysiloxane, a method of heat treatment using a methylating agent, etc. It can be obtained by hydrophobizing by a method well known to those skilled in the art. When the amount of DBA adsorbed exceeds 60 mmol / kg, the alkali resistance of the resulting coating film may decrease. Commercially available hydrophobic silica particles include Aerosil R-202, RY200 and RY.
Examples include 300 (all manufactured by Nippon Aerosil Co., Ltd.) and Nipseal SS178B (manufactured by Nippon Silica Industry Co., Ltd.).

The amount of DBA adsorbed can be determined by a measurement method well known to those skilled in the art, such as titration.

The resin particles are not particularly limited, and specific examples thereof include non-crosslinked resin particles and crosslinked resin particles having a weight average particle diameter of 5 to 35 μm. It is preferably 10 to 20 μm. If it is less than 5 μm, the resulting coating film may not be matte, and if it exceeds 35 μm, the stain resistance of the obtained coating film may be reduced. The above resin particles can be obtained by, for example, isolating particles obtained by emulsion polymerization of a polymerizable monomer in water. From the viewpoint of the alkali resistance of the resulting coating film, the crosslinked resin particles are preferably crosslinked inside the particles.
Such a crosslinked resin particle is preferably a crosslinked acrylic resin particle using an acrylic monomer as a polymerizable monomer from the viewpoint of industrial availability, and from a matte appearance, ethylene glycol methacrylate or divinyl as a raw material monomer. An acrylic monomer having a bifunctional or higher polymerizable unsaturated group such as benzene, and methyl methacrylate,
It is more preferable that the crosslinked acrylic resin particles include a methacrylic acid ester monomer such as n-butyl methacrylate and an acrylic monomer. Here, it is preferable that the amount of the acrylic monomer having a bifunctional or higher functional polymerizable unsaturated group is 5% by weight or more in the raw material monomer.

Examples of commercially available crosslinked resin particles include, for example, Techpolymer series (manufactured by Sekisui Plastics Co., Ltd.), Art Pearl series (manufactured by Negami Kogyo Co., Ltd.), Fine Pearl series (Sumitomo Chemical Co., Ltd.). Industrial Co., Ltd.), Labrocor series (manufactured by Dainichiseika Co., Ltd.) and the like.

The content of the silica particles and the resin particles in the stain resistant matte coating composition of the present invention is 0.1 to 200% by weight based on the coating solid content. When the content is less than 0.1% by weight, it is difficult to obtain a good matte coating film, and when it exceeds 200% by weight, the resulting coating film may have insufficient stain resistance. . More preferably, it is 0.1 to 100% by weight.

The weight ratio of the silica particles to the resin particles is preferably 1 / 0.1 to 1 / 3.0. When it is out of the above range, the matte appearance of the obtained coating film may be deteriorated. More preferably, 1/0.
It is 4 to 1/1.

Further, the stain resistant matting coating composition of the present invention comprises, in addition to the above-mentioned components, a curing catalyst, a coloring pigment, an extender pigment, a pigment dispersant, a thickener, a surface conditioner, a film-forming aid and an ultraviolet absorbing agent. Various components well known by those skilled in the art such as an agent, an antioxidant, a silane coupling agent, a flame retardant, an antistatic agent, and an anticorrosive agent may be included.

The stain resistant matte coating composition of the present invention comprises:
From the viewpoint of pot life, usually, the hydroxyl group-containing fluororesin, and other components that do not react with the hydroxyl group as a coating liquid, and also the polyisocyanate compound, the silicate compound, and if necessary isocyanate and silicate It is preferable that the other components that do not react are separately stored as a curing agent liquid and mixed immediately before use.

The method for forming a matte coating film of the present invention is to form a coating film by coating the above-mentioned stain-resistant matte coating composition on various substrates. The application is, for example,
Usually, it is applied once or twice by a method such as spraying, brushing, roller, curtain flow, roll, and dip.

Examples of the base material include iron, stainless steel, aluminum and the like, and metal surface-treated products thereof,
Cement-based base materials such as cements, limes and gypsum, polyvinyl chlorides, polyesters, polycarbonates,
Examples include plastic base materials such as acrylics. Note that these base materials may be preliminarily adjusted with a sealer according to the type of the base material, or a coating film may be formed on the surface of the base material with various kinds of paint.

The coating amount in one coating is not particularly limited, and may be, for example, 0.05 to 0.5 kg / m ^2.
And preferably 0.08 to 0.3 kg / m ² .

After coating, a coating film can be formed by drying at room temperature. The drying time can be set appropriately depending on the temperature.

The coating film thus obtained preferably has a 60 ° gloss value of 50 or less in order to obtain a good matte appearance. Further, in order to obtain a completely matte appearance, it is preferably 10 or less.

The coating film obtained by the coating film forming method of the present invention exhibits excellent stain resistance even though it is a matte coating film.

[0037]

Example 1 Zeffle GK510 (manufactured by Daikin Industries, Ltd., hydroxyl group- and carboxyl group-containing tetrafluoroolefin copolymer, solid content 50% by weight) 20.0 parts by weight, Taipaque C
34.0 parts by weight of R-95 (manufactured by Ishihara Sangyo Co., Ltd.), 3.0 parts by weight of butyl acetate and 3.0 parts by weight of xylene were charged into a tin container and stirred for about 30 minutes. The contents were transferred to a vessel for dispersion, glass beads were charged in an appropriate amount, and then beads were dispersed by a sand grind mill at 2000 rpm for about 1 hour. After removing the beads, 60.0 parts by weight of the obtained white dispersion paste was weighed into another tin container, and Zeffle GK500 (manufactured by Daikin Industries, Ltd., hydroxyl group-containing tetrafluoroolefin copolymer, solid content 60)
% By weight) 40.0 parts by weight, nip seal SS178B
(Nippon Silica Industry Co., Ltd. hydrophobic silica particles, weight average particle diameter 3.1 μm, DBA adsorption amount 37 mmol / kg)
0 parts by weight and Art Pearl G400 transparent (manufactured by Negami Kogyo Co., Ltd., crosslinked acrylic resin particles containing methacrylic acid methyl ester as a main acrylic monomer, weight average particle diameter 15
(μm) 2.0 parts by weight was gradually added with stirring,
The mixture was stirred and mixed for about 15 minutes to obtain a white coating liquid 1.

7.17 parts by weight of Coronate HX (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanurate of hexamethylene diisocyanate, solid content 100% by weight), Zeffle GH110 (manufactured by Daikin Industries, Ltd., fluorine atom-containing silicate compound, 100 parts by weight of active ingredient) %) 5.1 parts by weight and 10.0 parts by weight of butyl acetate were placed in a tin container and mixed by stirring with a disper for about 15 minutes to obtain a curing agent liquid 1.

Next, 100.0 parts by weight of the coating liquid 1 and 22.27 parts by weight of the curing agent liquid 1 were mixed by stirring with a disper for about 5 minutes to obtain a stain resistant matting coating composition 1. Furthermore, the paint viscosity of Ford Cup No. 1 was reduced with Duflon thinner (a painter of Nippon Paint Co., Ltd., a normally dry organic solvent-based thinner). It was diluted to 4 at 20 seconds / 20 ° C.

Further, the surface-treated aluminum plate (9
Hypon 20 dechro gray paint (30 × 0.7 cm) (Nippon Paint Co., Ltd., a normal-drying organic solvent based undercoat paint)
To a dry film thickness of 40 μm and dried at room temperature for 24 hours, and then a DUFRON 4F intermediate coating white paint (manufactured by Nippon Paint Co., Ltd., normally dry organic solvent-based intermediate coating paint) is dried to a film thickness of 25
It was applied so as to have a thickness of μm and dried at room temperature for 24 hours to obtain a base material.

On the obtained base material, the diluted stain resistant matting coating composition 1 was dried by air spray to obtain a film thickness of 25 μm.
A test coated plate was prepared by coating so as to have a thickness of m.

Example 2 After obtaining a stain resistant matting coating composition 2 in the same manner as in Example 1 except that the nip seal SS178B was 4.5 parts by weight and the Art Pearl G400 transparent was 3.0 parts by weight. , And was diluted in the same manner, and a test coated plate was prepared.

Example 3 A stain-resistant matting coating composition 3 was prepared in the same manner as in Example 1 except that the nip seal SS178B was 10.0 parts by weight and the Art Pearl G400 transparent was 6.7 parts by weight.
After obtaining the above, it was diluted in the same manner and a test coated plate was prepared.

Comparative Example 1 Art Pearl G400 Nip seal SS without using transparent
A stain resistant matting coating composition 4 was obtained in the same manner as in Example 1 except that only 178B was used in an amount of 10.0 parts by weight, and then diluted in the same manner to prepare a test coated plate.

Comparative Example 2 Art Pearl G400 Imported talc PK instead of transparent PK
(Fuji Talc Co., Ltd., weight average particle size 8 μm) was added in the same manner as in Example 1 except that 20 parts by weight was added, and then a stain resistant matting coating composition 5 was obtained, and then diluted in the same manner, and further, A test coated plate was prepared.

Comparative Example 3 Example 1 except that 3 parts by weight of nip seal SS178B and 12 parts by weight of Art Pearl G400 transparent were used.
In the same manner as described above, a stain resistant matting coating composition 6 was obtained, and then diluted in the same manner to prepare a test coated plate.

Example 4 20.0 parts by weight of Zeffle GK510, Zeffle GK5
00, 40.0 parts by weight, acetic acid butyl ester 20.0 parts by weight and xylene 20.0 parts by weight were charged into a tin container and mixed with stirring. Furthermore, nip seal SS178B
4.5 parts by weight and Art Pearl G400 transparent 3.
After gradually adding 0 part by weight with stirring, the mixture was stirred and mixed for about 15 minutes to obtain a transparent coating liquid 2.

Next, 100.0 parts by weight of the coating liquid 2 and 22.27 parts by weight of the curing agent liquid 1 prepared in Example 1 were mixed by stirring with a disper for about 5 minutes, and a stain resistant matting coating composition was obtained. Got 7. Furthermore, the paint viscosity of Ford Cup No. 1 was reduced with Duflon thinner (a painter of Nippon Paint Co., Ltd., a normally dry organic solvent-based thinner). It was diluted to 4 at 20 seconds / 20 ° C.

Further, the surface-treated aluminum plate (9
Hypon 20 dechro gray paint (30 × 0.7 cm) (Nippon Paint Co., Ltd., a normal-drying organic solvent based undercoat paint)
To a dry film thickness of 40 μm and dried at room temperature for 24 hours, and then a DUFRON 4F intermediate coating white paint (manufactured by Nippon Paint Co., Ltd., normally dry organic solvent-based intermediate coating paint) is dried to a film thickness of 25
It was applied so as to have a thickness of μm and dried at room temperature for 24 hours to obtain a base material.

On the obtained base material, the diluted stain-resistant matting coating composition 7 was dried by air spray to obtain a film thickness of 25 μm.
A test coated plate was prepared by coating so as to have a thickness of m.

Example 5 A stain resistant matting coating composition 8 was prepared in the same manner as in Example 4 except that 10.0 parts by weight of the nip seal SS178B and 6.7 parts by weight of Art Pearl G400 transparent were used.
After obtaining the above, it was diluted in the same manner and a test coated plate was prepared.

Comparative Example 4 A stain resistant matting coating composition 9 was obtained in the same manner as in Example 4 except that 10.0 parts by weight of nip seal SS178B was used and Art Pearl G400 transparent was not used. And diluted to prepare a test coated plate.

<Evaluation Test> Examples 1 to 5 and Comparative Example 1
The following evaluation tests were performed on each test coated plate obtained in ~ 4. The evaluation results are shown in Table 1.

Gloss Value The 60-degree gloss value of each of the test coated plates obtained was measured with GM-26D (Murakami Color Research Laboratory Co., Ltd. gloss meter). A gloss value of 50 or less was matte for 5 to 3 minutes, and 10 or less was completely matte.

Contamination resistance After measuring the chromaticity (L value, a value, b value) of the obtained test coated plate with an SM color computer SM-7 (manufactured by Suga Test Instruments Co., Ltd.), JIS Z 2381 6.2. Contamination exposure according to No. 1 was performed, and the color difference (ΔE) after 6 months was measured. Δ
Those with E of 3.0 or less were accepted.

Alkali resistance The obtained coated test plates were subjected to the Alkali resistance test A method in accordance with JIS A 6909, and the test coated plates after the test were visually evaluated for discoloration and blisters, and they were good.

[0057]

[Table 1]

As is clear from Table 1, it was found that the stain-resistant matte coating composition of the present invention can provide a matte coating film excellent in stain resistance (Examples 1 to 5).
However, when the total amount of silica particles and resin particles is more than a predetermined amount or when silica particles and resin particles are not included and silica particles and extender pigments are included, a good matte coating can be obtained, but stain resistance Was found to be insufficient (Comparative Examples 1 to 4).

[0059]

The stain-resistant matte coating composition of the present invention contains a silicate compound and a specific amount of silica particles and resin particles, so that a matte coating film excellent in stain resistance can be obtained. it can. This is because the extender pigment that has been conventionally used to obtain a matte coating film is filled up to the surface layer to inhibit the hydrophilicity of the surface layer portion of the coating film, and as a result, the stain resistance cannot be sufficiently exhibited. It is thought that it was caused. Therefore, it is considered that a coating film having excellent stain resistance can be formed by using resin particles that are considered to be less affected by such filling, even though the coating film is a matte coating film.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 133/00 C09D 133/00 175/04 175/04 183/02 183/02 (72) Inventor Ryozo Takakawa 19-17 Ikedanaka-cho, Neyagawa-shi, Osaka F-term in Japan Paint Co., Ltd. (reference) 4D075 CA34 CB02 DC01 EB16 EB22 EB38 EB42 EC03 EC54 4J038 CD091 CG142 CH032 CJ052 CJ132 DG191 DG261 DL022 GA03 HA446 KA08 KA20 MA05 PC02 NA05 NA02 NA05 NA02 NA05 NA02 PC08

Claims (7)

[Claims] 1. A fluorine-containing resin containing a hydroxyl group, a polyisocyanate compound and a silicate compound, and silica particles and resin particles, wherein the total amount of the silica particles and the resin particles is 0.1 to the coating solid content. Two
A stain-resistant matting coating composition, characterized in that it is 100% by weight. 2. The stain resistant matting coating composition according to claim 1, wherein the weight ratio of the silica particles to the resin particles is 1 / 0.1 to 1 / 3.0. 3. The stain resistant matting coating composition according to claim 1, wherein the silica particles are hydrophobic silica particles. 4. The stain resistant matting coating composition according to claim 1, wherein the resin particles are crosslinked resin particles. 5. The stain resistant matte coating composition according to claim 4, wherein the crosslinked resin particles are crosslinked acrylic resin particles. 6. A matte coating film, characterized in that the stain resistant matte coating composition according to any one of claims 1 to 5 is applied to a substrate to form a matte coating film. Forming method. 7. The method for forming a matte coating film according to claim 6, wherein the coating film obtained according to claim 6 has a 60-degree gloss value of 50 or less.