JP2883275B2 - Composition for coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION This invention relates to coating compositions and more particularly to iron, stainless steel, aluminum and other metals, ceramics, cement, concrete, glass, plastics, paper, fiber, wood and other products. Of the surface of, or organic, inorganic coatings and cured at room temperature or under heating, weather resistance, heat resistance, alkali resistance, organic solvent resistance, chemical resistance, corrosion resistance,
Stain resistance, abrasion resistance, impact resistance, flexibility, antistatic properties,
The present invention relates to a coating composition for forming a high-hardness coating film having excellent adhesion and excellent workability and repairability.

[0002]

2. Description of the Related Art Conventionally, hardness, chemical resistance,
Various coating compositions for forming a cured coating film on a substrate surface for the purpose of improving heat resistance and the like have been proposed.

For example, the following (a) and (b) are known as organoalkoxysilane-based coating compositions. (A) an organoalkoxysilane represented by RSi (OR ′) ₃ (wherein R and R ′ represent an alkyl group or an aryl group) or a hydrolyzate thereof, and Si (OR ″) ₄
(Wherein, R ″ represents an alkyl group) and a composition with a tetraalkoxysilane or a hydrolyzate thereof (JP-B-55-4148, JP-B-55-40631, JP-B-55-41273). (B) Composition comprising an organoalkoxysilane represented by RSi (OR ') ₃ (wherein R and R' represent an alkyl group or an aryl group) or a hydrolyzate thereof and colloidal silica. (JP-A-55-94971, JP-A-5-94971)
No. 9-68377).

However, with these coating compositions, although a transparent coating film having relatively good adhesion can be obtained on the surface of a glass substrate or an inorganic substrate, it can be applied to the surface of another organic substrate or the like. Is insufficient, and the resulting coating film has insufficient alkali resistance, corrosion resistance, impact resistance, flexibility and the like.

On the other hand, as a thermosetting resin-based coating composition, a composition containing a thermosetting resin which is liquid at room temperature as a main component or a thermosetting resin in an organic solvent can be used without mentioning the references. Melted varnishes are widely known.

[0006] Although cured films of these thermosetting resins have excellent adhesion to the surface of an organic base material, they do not have sufficient adhesion to the surface of a metal or inorganic base material. Are insufficient in weather resistance, stain resistance, antistatic property, heat resistance, hardness and the like.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to an alkali-alkoxysilane-based coating composition and a thermosetting resin-based coating composition, each of which has the problems of alkali resistance, corrosion resistance, impact resistance, and bending. Provide a coating composition capable of forming a cured coating film with excellent adhesion to a wide range of substrate surfaces, which solves the properties, weather resistance, stain resistance, antistatic property, heat resistance, hardness, etc. The purpose is to:

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, by combining an organoalkoxysilane and a thermosetting resin varnish, and further combining alumina, an inorganic system was obtained. Ability to form a cured coating film with excellent adhesion on various substrate surfaces regardless of organic system
The present inventors have found that the surface hardness and antistatic property of a cured coating film can be improved, and have completed the present invention.

The present invention comprises the following components (a) to (e) and optional additives, and comprises the following components (a) to (e):
Sum of (e) [= (a) + (b) + (c) + (d) +
(E)], wherein the liquid composition contains 100 parts by weight, and the liquid composition has a nonvolatile content of 8 to 55 parts by weight in an acidic region having a pH of 7 or less. is there. (A) R ¹ Si (OR ² ) ₃ (wherein R ¹ has 1 to ¹ carbon atoms)
8 organic groups, R ² is an alkyl group having 1 to 5 carbon atoms and / or
Or an acyl group having 1 to 4 carbon atoms) 10 to 45 parts by weight of an organoalkoxysilane represented by the following formula (b): an epoxy resin soluble in the following hydrophilic organic solvent (d), a thermosetting acrylic resin, and an epoxy-modified resin. 2 to 20 parts by weight of a thermosetting resin which is at least one selected from the group consisting of a polyamide resin, a polyurethane resin and an unsaturated polyester resin (c) colloidal and / or ultrafine alumina (in terms of alumina) 14 parts by weight (d) 1 to 70 parts by weight of a hydrophilic organic solvent (e) 3 to 60 parts by weight of water

With respect to the coating composition of the present invention,
Hereinafter, each component will be described. Component (a) R ¹ Si (O
R ²⁾ organo alkoxide silane used in organoalkoxysilane present invention represented by _3, which high molecular weight hydrolysis and polycondensation in the presence or absence of an acid or alkali in the presence of water The coating film cures under heating or at room temperature. Further, in the coating composition of the present invention, a coupling agent for improving the affinity between the organic component (b) the thermosetting resin and the inorganic component (c) colloidal and / or ultrafine alumina particles; It acts as a dispersant to uniformly disperse alumina in the composition.

The organoalkoxysilane is preferably an organic group wherein R ¹ in the above formula has 1 to 8 carbon atoms, for example, a methyl group,
An alkyl group such as an ethyl group or an n-propyl group, a γ-chloropropyl group, a vinyl group, a 3,3,3-trifluoropropyl group, a γ-glycidoxypropyl group, a γ-methacryloxypropyl group, a γ- A mercaptopropyl group, a phenyl group, a 3,4-epoxycyclohexylethyl group, a γ-aminopropyl group and the like;
² is an alkyl group having 1 to 5 carbon atoms and / or an acyl group having 1 to 4 carbon atoms, for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a sec-butyl group; An organic silane compound such as a t-butyl group and an acetyl group.

Specific examples of these organoalkoxysilanes include methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, and n-propyltrimethoxysilane.
Propyltriethoxysilane, i-propyltrimethoxysilane, i-propyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 3,3,3 -Trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-
Mercaptopropyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3,4
-Epoxycyclohexylethylmethoxysilane, 3,
4-epoxycyclohexylethylethoxysilane, γ
-Aminopropylmethoxysilane and γ-aminopropylethoxysilane.

[0013] These organoalkoxysilanes include 1
The species may be used alone or in combination of two or more. Preferably, methyltrimethoxysilane or methyltriethoxysilane is used. Further, a hydrolyzate obtained by hydrolyzing such an organoalkoxysilane in the presence or absence of an acid or an alkali in advance, and a partial condensate obtained by further aging and hydrocondensing the hydrolyzate can also be used.

The proportion of the component (a) in the total of 100 parts by weight of the coating compositions (a) to (e) is 10 to 45 parts by weight, preferably 15 to 40 parts by weight, in terms of organoalkoxysilane. . If the blending ratio of the component (a) is less than 10 parts by weight, the hardness of the cured coating film is insufficient.
If the amount exceeds 5 parts by weight, the hardness of the coating film increases, but the impact resistance, the bending resistance and the like are significantly reduced, which is not preferable.

Thermosetting resin of component (b) The thermosetting resin of component (b) has at least 2
It has three functional groups and is cross-linked and polymerized three-dimensionally by heating and cured, and the cured product does not show thermoplasticity. By heating or leaving at room temperature in the presence or absence of a curing agent, It is a hardening resin. In the present invention,
It copolymerizes with the organopolysiloxane formed by the polycondensation of the organoalkoxysilane of the component (a) to form a cured film having high hardness and flexibility, and adheres the cured film to the organic base surface. Improve the performance.

Examples of the thermosetting resin (b) include epoxy resins such as bisphenol A type epoxy resin and bisphenol F type epoxy resin, such as alkyd resins and unsaturated polyester resins such as maleic unsaturated polyester and diallyl phthalate. Examples thereof include a thermosetting acrylic resin, an epoxy-modified polyamide resin, and a polyurethane resin such as unsaturated polyester. In the present invention, those which are soluble in the hydrophilic organic solvent of the component (d) are dissolved in the solvent. Used as varnish.

One of these thermosetting resins (b) may be used alone, or two or more thereof may be used in combination.
Preferably, at least one selected from the group consisting of an epoxy resin, a thermosetting acrylic resin, and an epoxy-modified polyamide resin is used.

The mixing ratio of the component (b) in the total 100 parts by weight of the coating compositions (a) to (e) is 2
To 20 parts by weight, preferably 4 to 15 parts by weight. If the compounding ratio of the component (b) is less than 2 parts by weight, sufficient impact resistance of the coating film cannot be obtained, while if it exceeds 20 parts by weight, the surface hardness of the coating film is significantly reduced, which is not preferable.

Component (c) Colloidal or Ultrafine Alumina Colloidal alumina is an alumina sol having a pH of 2.5 to 6 using water and / or a lower alcohol as a dispersion medium and containing 5 to 25% by weight of alumina. In addition, an acid such as nitric acid, hydrochloric acid, or acetic acid is used as a stabilizer, and the ultrafine alumina is alumina produced by a high-temperature hydrolysis method of a purified aluminum salt (a specific example; manufactured by Degussa Co., Ltd.).

In the present invention, since the alumina has a high positive charge, the antistatic property of the coating film is improved,
As a result, the stain resistance of the coating film is improved. Alumina also improves the thermal emissivity of the coating. Further, occurrence of bumps on the coating film can be prevented.

As the colloidal or ultrafine alumina, the average particle size or average thickness is 5 to 50 mμ.
Or a feather-like material is preferred. The proportion of the component (c) in the total of 100 parts by weight of the coating compositions (a) to (e) is 1 to 14 parts by weight, preferably 3 to 12 parts by weight in terms of alumina. If the blending ratio of the component (c) is less than 1 part by weight, a sufficient antistatic effect cannot be obtained, while if it exceeds 14 parts by weight, the viscosity of the coating composition increases, which is not preferable.

Component (d) Hydrophilic Organic Solvent The hydrophilic organic solvent used in the present invention is an organic solvent which dissolves the thermosetting resin of component (b) and is compatible with water. In addition to dissolving the above, it is used as a regulator of the solid content concentration and viscosity of the coating composition, and as a hydrolysis regulator of the alkylalkoxysilane of the component (a).

The hydrophilic organic solvent used in the present invention includes alcohols, glycols, esters, ethers, ketones and the like. Alcohols have 1 to 1 carbon atoms
Aliphatic alcohols such as methanol, ethanol, n-propanol, i-propanol, n-butanol, sec-butanol, t-butanol, n-pentanol, n-hexanol, 4-methyl-2-pentanol, -Methyl-n-pentanol and the like. The glycol such as ethylene glycol, propylene glycol can be mentioned up. As the esters, formic acid of the alcohols and glycols,
Esters such as acetic acid and propionic acid, specifically, methyl formate, ethyl formate, butyl formate, methyl acetate, ethyl acetate, butyl acetate, and ethyl propionate can be exemplified.

Examples of the ethers include alkyl ethers of the alcohols and glycols, such as dimethyl ether, diethyl ether, dibutyl ether, methyl ethyl ether, ethyl butyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate and propylene. Glycol monoethyl ether and the like. Ketones include acetone, diethyl ketone, methyl ethyl ketone,
Acetophenone and the like can be mentioned.

Such a hydrophilic organic solvent can be used alone or as a mixture of two or more solvents. In the present invention, i-propanol, n-butanol, ethylene glycol monobutyl ether, methyl ethyl ketone, ethyl acetate alone or A mixed solvent of two or more thereof is preferably used.

The proportion of the component (d) in 100 parts by weight of the total of the coating compositions (a) to (e) is 1
The amount is from 70 to 70 parts by weight, preferably from 10 to 50 parts by weight. When the colloidal alumina of the component (c) is alcoholic, the alcohol is also included in the hydrophilic organic solvent. When the blending ratio of the component (d) is less than 1 part by weight, the viscosity of the coating composition is too high, and the storage stability is lowered. On the other hand, when it exceeds 70 parts by weight, the storage composition is improved, Since the solid content in the coating becomes low, the drying rate and hydrolysis rate of the obtained coating film decrease, and it takes a long time for curing, which is not preferable.

[0027] In the component (e) water present invention, water is an essential component as a hydrolysis agent of the alkyl alkoxy silane component (a). As this water, tap water, distilled water, and ion-exchanged water can be used.
Further, water generated by hydrolysis of the alkylalkoxysilane of the component (a) and water contained as a dispersion medium of the colloidal alumina of the component (c) are also included.

The mixing ratio of the component (e) in 100 parts by weight of the total of the coating compositions (a) to (e) is 3
６０60 parts by weight, preferably 10-40 parts by weight. When the compounding ratio of the component (e) is less than 3 parts by weight, hydrolysis of the alkylalkoxysilane of the component (a) is unlikely to occur sufficiently. On the other hand, when it exceeds 60 parts by weight, the stability of the coating composition decreases, Further, the drying speed of the coating film is decreased, which is not preferable.

The coating composition of the present invention contains, in addition to the components (a) to (e), a surfactant if necessary.
Additives such as acids, aluminum acetylacetonate, pigments, microparticulate silica, and curing agents for thermosetting resins can be included.

The coating composition of the present invention contains the above-mentioned components (a) to (e) and, if necessary, additives, and has a nonvolatile content of 8 to 55 parts by weight in an acidic region of pH 7 or less, preferably 8 to 55 parts by weight. Is a liquid composition of 20 to 45 parts by weight. When the non-volatile content is less than 8 parts by weight, a coating film having a sufficient thickness cannot be obtained by one application and the workability deteriorates. On the other hand, when it exceeds 55 parts by weight, it is difficult to obtain a coating film having a uniform thickness. Not preferred.

The coating composition of the present invention is prepared by dissolving the thermosetting resin of the component (b) in the hydrophilic organic solvent of the component (d) to prepare a varnish. The ultrafine alumina, water of component (e), and additives as needed are added, and the alumina is sufficiently dispersed using a roll mill or a grinder. It can be prepared by adding the organoalkoxysilane of the component (a) to the mixture and sufficiently stirring.

Substrates to be coated with the coating composition of the present invention include metals such as iron, stainless steel and aluminum, inorganic substrates such as cement, concrete, glass and ceramics, plastics, paper and wood. Surface of organic or inorganic coating films in addition to the organic base materials.

For coating the substrate with the coating composition, coating means such as brushing, spraying, dipping, roll coating, spin coating and printing can be used. It is possible to form a coating film having a dry film thickness of 0.1 to 20 μm by one application, and it is also possible to apply two to five more applications. In the case of recoating, a curing treatment may be performed once.

When the coating composition of the present invention is coated on a substrate, the component (a) organoalkoxysilane is hydrolyzed at the temperature of from room temperature to 60 ° C., and at the same time, a polycondensation reaction occurs to form a sol. The reaction further proceeds to form a gel, that is, an organopolysiloxane compound. Leave it at room temperature for 1-10 days or 8
By heating at 0 to 200 ° C. for 3 to 60 minutes, the organopolysiloxane compound and the thermosetting resin of the component (b) are copolymerized with the volatilization of the solvent, and further the component (c)
To form a cured composite film of alumina. However, the reaction temperature and the standing or heating time are not limited to the above, since they vary depending on the type and the mixing ratio of each component used.

[0035]

The cured coating film formed by the coating composition of the present invention is composed of an organopolysiloxane for a metal substrate or an inorganic substrate, and a thermosetting component (b) for an organic substrate. The adhesiveness to various base materials is extremely excellent because the conductive resin leads the adhesiveness.

The surface hardness of the cured coating film is as high as inorganic due to the composite of organopolysiloxane and alumina, and the high hardness reduces the impact resistance and the flexibility. Since the resin is used as a cushioning material for interpolation, mechanical properties such as impact resistance and bending resistance are also extremely excellent.

Further, by combining alumina, not only the heat radiation property is improved, but also the positive charge of the alumina prevents the charging property of the thermosetting resin of the component (b), and as a result, the contamination prevention property is obtained. Improves heat dissipation,
A cured coating film having excellent antistatic properties and stain resistance is obtained.

In addition to the above, the organopolysiloxane and the thermosetting resin of the component (b) are mutually interpolated to provide weather resistance,
A cured coating film having excellent heat resistance, alkali resistance, organic chemical resistance, corrosion resistance and abrasion resistance can be obtained. The coating composition of the present invention is extremely excellent in workability because various coating means can be adopted, and also excellent in repairability since it can be applied repeatedly.

[0039]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples. In the examples, “parts” and “%” are based on weight unless otherwise specified.

Examples 1-2, Comparative Example 1 (1) Preparation of Coating Composition Using the following components, a component (c) and a component (e) were added to a varnish prepared by dissolving the component (b) in the component (d). ) And with or without additives, using a stirrer for 60 minutes, then add the component (a), stir for another 30 minutes, disperse the mixture with a roll mill, and coat with a coating ratio shown in Table 1. Compositions E and D (Examples 1 and 2) and Coating Composition H (Comparative Example 1) were prepared.

Component (a) organoalkoxysilane (a) -1: methyltrimethoxysilane (a) -2: methyltriethoxysilane Component (b) thermosetting resin (b) -2: amino resin (melamine) ( Nonvolatile content 60
%) (B) -3: epoxy resin (nonvolatile content 40%) (b) -5: acrylic resin (nonvolatile content 50%)

Component (c) Colloidal or ultrafine alumina (c) -1: aqueous colloidal alumina (alumina 20
%, PH 4.0) (c) -2: Ultrafine alumina particles (average particle size: 15 μm) Component (d) Hydrophilic organic solvent (d) -1: i-propanol (d) -2: Butyl carbitol (ethylene (D) -3: methyl ethyl ketone component (e) water

Component (f) (additive ) (f) -1: nonionic surfactant (f) -3: acetic acid (f) -4: pigment titanium oxide (f) -5: pigment iron oxide (f) -6: Ultrafine silica (average particle size 15 mμ)

[0044]

[Table 1] ―――――――――――――――――――――― │Composition name │ D │E │H │ │ │ (Example) │ (Example) ｜ (Comparative Example) ｜ │ ―――――― ｜ ―――――― │ ―――――― ｜ ―――――― ｜ ｜ Formulation (Parts) ｜ ｜ ｜ ｜ (a) -1 ｜-｜ 38 | 25 | | (a) -2 | 25 |-|-| | (b) -2 |-|-| 10 | | (b) -3 | 6 | 5 |-| | (b) -5 | -| 10 |-| | (c) -1 | 15 | 20 |-| | (c) -2 |-| 3 |-| | (d) -1 | 30 |-| 35 | | (d)- 2 | 5 | 12.5 | 5 | | (d) -3 | 14 | 11.5 |-| | (e) | 5 |-| 25 | | subtotal | 100 | 100 | 100 | | ――――― │ ―――――― │ ―――――― ｜ │ (f) -1 │ 0.5 │ 0.5 │ 0.5 │ │ (f) -3 │-│-│ 0.5 │ │ (f) -4 │-│ 10 │-│ │ (f) -5 │-│ 2 │-│ │ (f) -6 │-│-│ 11 │ Nonvolatile content │ 14.7 │ 44.7 │ 27.8 │ ― ―――――――――――――――――――――――

(2) Preparation of Test Piece for Evaluation Test The test composition for evaluation test by applying and curing the coating composition shown in Table 1 prepared in the above section (1) to various substrates shown in Table 2. TP6, 8-9, 13 and 15
Was prepared. In the substrate to be coated, the aluminum plate was subjected to toluene degreasing, and the others were subjected to cleaning treatment as a base treatment before application of the coating composition. An air spray gun was used for applying the coating composition, and an electric oven was used for heating. The coating compositions were all used within 8 hours after preparation. Table 3 shows the number of application times and curing conditions of the coating composition.

[0046]

[Table 2] ――――――――――――――――――――――――――― ｜ TP No. ｜ Material ｜ Dimensions ｜ Production quantity ｜ │ ―――― ― ｜ ―――――――――― ｜ ―――――――――― ｜ ―――― ｜ ｜ 6 ｜ Aluminum plate ｜ 100 × 100 × 2mm ｜ 18 sheets ｜ ｜ 8-9 ｜ Flexible plate ｜ 13 × Polycarbonate board ｜ 100 × 100 × 2mm ｜ 5 pieces ｜｜ 15 ｜ Hinoki board ｜ 200 × 200 × 20mm ｜ 5 pieces ｜ ――――――――――― ――――――――――――――――――

[0047]

[Table 3] ――――――――――――――――――――――――――― ｜ Test piece ｜ Use ｜ Coating ｜ Film thickness ｜ Hardening Case ｜ ｜ No. ｜ Composition ｜ Number of times ｜ (μm) ｜ ｜ ｜ ―――――― ｜ ―――― ｜ ―― ｜ ―――― ｜ ―――――――――― Example) | H | 1 | 5 | 180 ° C x 30 minutes | | 8 (Example) | D | 1 | 4 | 80 ° C x 30 minutes | | 9 (Example) | E | 2 | 18 | │ × 5 minutes, │ │ │ │ │ 2nd normal temperature x 7 days │ │13 (comparative example) │ H │ 1 │ 4 │80 ℃ x 20 minutes │ │15 (Example) 1st 70 ℃ × 30min, | ｜ ｜ ｜ ｜ ｜ 2nd 70 ℃ × 30min | ―――――――――――――――――――――――――――― ―

(3) Evaluation Test The test piece prepared in the above section (2) was kept in a room for 7 days, and the following evaluation test was performed. Adhesion conforms to JIS K-5400-6.15 grid test Hardness conforms to JIS K-5400-6.14 pencil scratch test Impact resistance conforms to JIS K-5400-6.13.2

After holding the test piece in a heat-resistant electric furnace at 250 ° C. for 24 hours,
Cool and allowed to cool after the test piece 8 hours kept in observation boiling water resistance boiling water the appearance of the coating film, which 1
After repeating 0 times, observe the appearance of the coating film After holding the test piece in warm water of 60 ° C. for 20 days, observe the appearance of the coating film

The salt water 4% sodium chloride after water in the test piece 20 days retention, coating film appearance observation solvent resistance acetone / cellosolve / ethyl acetate / industrial aqueous alcohol / toluene = 3/2/2/1/2 After immersing the test piece in the mixed solvent (weight ratio) for 20 days, observe the appearance of the coating film

After holding the test piece in an alkali-resistant 5% aqueous sodium hydroxide solution for 20 days, observe the appearance of the coating film

Antistatic Property The half-life measurement method of Method A of JIS L1094-1980 was used. As a measuring method, a test piece was set on a half-life measuring instrument, an applied voltage of +10 kV was applied for 30 seconds, and a voltage after the applied voltage was cut was measured with time to determine its half-life. The unit is seconds.

[0053] 250 ° C. A test piece in thermal cycle resistance electric furnace for 30 minutes holding After spontaneous cooling, after this operation was repeated 8 times, using a steel wool appearance of the coating film observed wear resistance # 0000 after rubbing strongly test piece, observing the appearance of the coating film, by conforming to the presence or absence of scratches on the determination weatherability JIS K-5701 was sunshine carbon arc燈耐weathering tester, after exposure to the test piece 2000 hours, the coating film Table 4 shows the appearance test results and the retest results after the weather resistance test.

[0054]

[Table 4] ―――――――――――――――――――――――――――― ｜ ｜ Test piece number ｜ ｜ ｜ │ ―――――――― ―――――――――――――― ｜ ｜ Comparative Example ｜ Example ｜ After Weathering Test ｜ ｜ Test Item ｜ ―――――― ｜ ―――――――― ――――― ｜ ｜ ｜ 6 ｜ 13 ｜ 15 ｜ 8 ｜ 9 ｜ 8 │ 9 ｜ │ ―――――― ――― │ ｜ Adhesiveness │ ○ │ ○ │ ○ │ ○ │ ○ │ ○ │ ○ │ │Hardness │7H│5H│6H│7H│7H│ ○ │ ○ │ │ Impact Resistance │ × │ ○ │ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ｜ Heat resistance ｜ ○ ｜ / ｜ / ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ Boiling water resistance ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ Warm water ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ｜ Salt water resistance ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ | ○ ｜ ｜ Solvent resistance ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ ○ ｜ Alkali resistance ｜ / ｜ / ｜ / ｜ ○ ｜ ○ ｜ ○ │ ○ │ 18.5 | 4.2 | / | / | / | / |||| Cooling / heat cycle property |||||||||| Abrasion resistance |||||||||||||| ｜ Weather resistance ｜ / ｜ / ｜ / ｜ ○ ｜ ○ ｜ / ｜ / ｜ ――――――――――――――――――――――――――――――

[0055]

By using the coating composition of the present invention, as shown in the above Examples, a cured coating film of high hardness having excellent chemical properties, mechanical properties and electrical properties and having a good balance can be obtained. It can be formed irrespective of the material of the base material such as a metal base material, an inorganic base material, and an organic base material, and the cured coating film has extremely excellent adhesion to any base material. Further, by adjusting the composition of the coating composition, a cured coating film can be formed according to the material of the base material and the purpose of the coating. Furthermore, in coating, various known coating means can be employed, so that the workability is excellent, and the recoating property is excellent, since the recoating can be performed. The present invention provides a coating composition capable of forming a cured coating film having excellent chemical properties, mechanical properties, and electrical properties and having high hardness and a good balance regardless of the material of the base material. It has significant industrial significance.

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI C09D 177/00 C09D 177/00 // C04B 41/64 C04B 41/64 41/65 41/65 (58) Field surveyed (Int.Cl. ⁶ , DB name) C09D 183/04 C09D 133/06 C09D 163/00 C09D 167/06 C09D 175/04 C09D 177/00

Claims (4)

(57) [Claims] 1. A composition comprising the following components (a) to (e) and optionally added additives, and the total of components (a) to (e) [= (a) + (b) + (c) + ( d) + (a liquid composition containing 100 parts by weight e)], Katsuko
Nonvolatile content 8 pH7 following acidic areas of the liquid composition
The composition for coating characterized by being -55 parts by weight. (A) R ¹ Si (OR ² ) ₃ (wherein R ¹ has 1 to ¹ carbon atoms)
8 organic groups, R ² is an alkyl group having 1 to 5 carbon atoms and / or
10 to 45 parts by weight of an organoalkoxysilane represented by (b) an epoxy resin soluble in the following (d) hydrophilic organic solvent:
Fat, thermosetting acrylic resin, epoxy-modified polyamide tree
Fats, polyurethane resins and unsaturated polyester resins
2 to 20 parts by weight of a thermosetting resin which is at least one selected from the group consisting of (c) 1 to 14 parts by weight of alumina (in terms of alumina) in the form of colloid and / or ultrafine particles (d) hydrophilic organic solvent 1 to 70 parts by weight (e) Water 3 to 60 parts by weight Wherein organo alkoxide silane of component (a), the coating composition according to claim 1 which is methyl trimethoxysilane and / or methyl triethoxy silane. 3. The colloidal or ultrafine alumina of component (c) has an average particle size or average thickness of 5 to 50.
2. The coating composition according to claim 1, which has a particle size of mμ. 4. The coating composition according to claim 1, wherein the hydrophilic organic solvent of the component (d) is at least one selected from the group consisting of alcohols, glycols, esters, ethers and ketones. Composition.