JP3035978B2 - Paint finishing method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a new and useful paint finishing method. More specifically, the present invention uses a specific curable resin composition as a base coat paint, while using a carboxyl group-containing vinyl polymer as a top clear paint and an epoxy group and a hydrolyzable silyl group in one molecule. The present invention relates to a paint finishing method comprising using a curable resin composition comprising a compound having a group.

[Conventional technology]

In recent years, in automotive topcoating, in addition to the metallic coating finishing method of applying a paint containing a metallic powder, the so-called solid color coating finishing method of applying a paint containing a coloring pigment, the base coat paint is applied after coating. It has been recognized that a so-called two-coat / one-bake finish method in which a top clear paint is applied and baked at a time is applied.

That is, the coating film obtained by the two-coat / one-bake coating finish is excellent in the finished appearance and the feeling of holding the body, and in particular, in the past, a vinyl polymer having a remarkable defect in weather resistance. The solid color paint having as a main component has various advantages such as that a coating film excellent in weather resistance can be obtained by making the two-coat / one-bake finish.

In general, such a two-coat / one-bake finish method involves coating an aminoalkyd resin paint or a thermosetting acrylic resin paint as a base coat paint,
After leaving it for a certain amount of solvent after leaving it for a few minutes, apply the same type of top clear paint directly, then bake it in a hot air drying oven at 140-150 ° C for 20-30 minutes. It is to be cured.

However, an acrylic melamine-based clear coating is often used as a top clear coating in terms of weather resistance, and a disadvantage of this system is poor acid resistance. This is a problem related to acid rain, which is rapidly becoming a problem in recent years. For example, a situation in which a painted surface of a new car significantly deteriorates its appearance due to acid rain occurs.
It was necessary to take measures such as repainting,
It is also associated with a great deal of damage. As described above, in the automotive top coat finishing method, urgent development of a two-coat / one-bake paint excellent in the appearance of the coating film and the acid resistance is keenly desired.

[Problems to be solved by the invention]

In order to meet the above-mentioned various demands in the industry, the present invention aims to provide a two-coat / one-bake coating finishing method capable of obtaining a composite coating film having excellent coating appearance and acid resistance. The object of the present invention is to provide a two-bake finish method, which is the problem to be solved by the present invention.

[Means for solving the problem]

In view of the above-mentioned drawbacks of the prior art and the strong demands demanded by the industry, the present inventor has conducted intensive studies and, as a result, used a specific curable resin composition as a resin for a base coat paint. By using a curable resin having a specific functional group (reactive group) as a resin for clear coating, it has been found that the above-mentioned required performance can be drastically improved, and the present invention has been completed.

That is, the present invention basically uses a curable resin composition obtained by blending an aminoplast with a polyol component as a resin for a base coat paint, and a carboxyl group-containing vinyl resin as a top clear paint and one molecule. A paint finishing method comprising using a curable resin composition comprising a compound having both an epoxy group and a hydrolyzable silyl group, particularly a two-coat / one-bake finish method, and a polyol component as a resin for base coat paint. Using a curable resin composition obtained by blending a polyisocyanate component or aminoplast with a carboxyl group-containing vinyl resin and a compound having both an epoxy group and a hydrolyzable silyl group in one molecule as a top clear coating composition. 3 coats comprising using a curable resin composition comprising Such as bake coating finishing method, it is intended to provide a so-called multilayer coating finishing method.

Specifically, a coating material for base coat (BC-1) containing a curable resin containing a metallic powder and / or a coloring pigment as an essential component for forming a coating film is applied, and then the coated surface thus obtained is applied. Then, a top clear paint (TC-1) comprising the above-mentioned curable resin composition is applied, and thereafter, a two-coat / one-bake finish method comprising curing each coating film at a time is provided. In addition, the base coat paint (BC-1) is applied, and then, the specific top clear paint (TC-1) is applied thereon to cure each coat at a time, Thereafter, in the so-called three-coat / two-bake coating finishing method in which the top clear paint is further applied and cured again, In the two-coat / one-bake finishing method, aminoplasts (D) are blended with polyols such as vinyl polymer polyol (A) and polyester polyol (B) as resin components constituting paint (BC-1). In the three-coat / two-bake finishing method, the resin composition obtained by blending a polyisocyanate (C) or an aminoplast (D) is used, while the clear coating for the top coat is used. (TC
-1) as a carboxyl group-containing vinyl polymer (E)
And a compound (F) having both an epoxy group and a hydrolyzable silyl group in one molecule as essential components, and further, if necessary, hydrolysis to condensation of the above-mentioned hydrolyzable silyl group. (G) and / or carboxyl group of vinyl polymer (E) and compound (F)
The use of a curable resin composition which also contains a reaction catalyst (H) with an epoxy group of (1) to form a composite cured coating film (laminated coating finishing method). is there.

Here, first, the above-mentioned base coat paint (BC-1) is constituted, and the vinyl polymer polyol (A) which is one of the essential components of the base coat paint composition is used.
Is obtained by using a hydroxyl group-containing vinyl monomer (a-1) as an essential monomer component and, if necessary, using another copolymerizable vinyl monomer (a-2).
Among them, the hydroxyl group-containing vinyl monomer (a-1) includes β-hydroxyethyl (meth) acrylate,
Hydroxypropylene (meth) acrylate or β
Hydroxyalkyl (meth) acrylates such as -hydroxybutyl (meth) acrylate, N-methylolated (meth) acrylamide,
FM, FA ”series (products of Daicel Chemical Industries, Ltd.) and“ T
ONE ^™ M-100 ”(product of Union Carbide) and β-hydroxyethyl (meth) acrylate
`` Blemmer PP-1000 '' represented by the general name of caprolactone or polypropylene glycol methacrylate, and `` Blemmer PE '' series represented by polyethylene glycol monomethacrylate (both products are Nippon Oil & Fats) Manufactured by
Furthermore, various unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid, fumaric acid or itaconic acid, "Kajura E" (Glycidyl ester of a branched fatty acid, manufactured by Shell), glycidyl octylate Alternatively, a typical example is an adduct with a monoepoxy compound represented by a monoglycidyl ester of a monovalent carboxylic acid such as glycidyl ester of palm oil fatty acid or a monoglycidyl ether such as butyl glycidyl ether.

Next, typical examples of the copolymerizable vinyl monomer (a-2) other than the hydroxyl group-containing vinyl monomer (a-1) include alkyl (meth) having an alkyl group of C _{1 to} C ₂₂ in the side chain. A) acrylate, styrene, vinyltoluene, t-butylstyrene, α-methylstyrene, glycidyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, (meth) acrylonitrile, cyclohexyl (meth) acrylate, maleic acid or fumaric acid diesters of C ₁ -C ₁₈ comprising monohydric alcohols, N, N-dialkylaminoalkyl (meth) acrylates or including phosphoric acid group-containing (meth) acrylates, Toka vinyl acetate, hexafluoropropylene and tetrafluoroethylene Fluorinated vinyl monomers such as ethylene. And these vinyl monomers (a-2)
May be used alone or in combination of two or more, depending on the desired coating film performance.

The vinyl polymer polyol (A) can be obtained by a known and common method using the above-mentioned monomers, for example, a solution polymerization method using a radical generator.

On the other hand, the polyester polyol (B) includes, as an acid component, isophthalic acid, phthalic anhydride, succinic anhydride,
Using a polybasic acid such as adipic acid or trimellitic anhydride, a monobasic acid such as benzoic acid or p-tert-butylbenzoic acid, etc., and as an alcohol component, neopentyl alcohol, trimethylolethane, trimethylolpropane, 1 It is appropriately synthesized using 1,6-hexanediol, 1,5-pentanediol, pentaerythritol, glycerin, ethylene glycol, or the like. The polyester polyol may be oil-modified, and usually has an oil length of 30% or less, and is a non-drying oil in terms of compatibility with the resin and weather resistance, particularly, coconut oil or its resin acid or octyl acid. Or a monoglycidyl ester of a synthetic resin acid such as "Cajura E".

Next, typical examples of the polyisocyanates (C) which are curing agents of the above-mentioned various polyol components include aromatic diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylene diisocyanate; tetramethylene diisocyanate Aliphatic diisoisocyanates such as hexamethylene diisocyanate or trimethylhexane diisocyanate; isophorone diisocyanate, methylcyclohexane-2,4- (or 2,6-) diisocyanate, 4,4'-methylenebis (cyclohexyl isocyanate) or 1,3 -(Diisocyanatomethyl)
Alicyclic diisocyanates such as cyclohexane, and each of these diisocyanates and polyhydric alcohols such as ethylene glycol, propylene glycol, neopentyl glycol or trimethylolpropane; Low molecular weight polyester resins (including oil-modified type); or isocyanates containing isocyanuric rings (including oligomers) obtained by polymerizing adducts with water, burettes, or the above-mentioned diisocyanates. .)and so on.

Also, isocyanatoethyl (meth) acrylate,
One type of vinyl monomer having at least one polymerizable unsaturated bond and an isocyanate group in one molecule, represented by isocyanate propyl (meth) acrylate, isocyanate butyl (meth) acrylate, methacryloyl isocyanate or isopropenyl isocyanate. Alternatively, a copolymer of two or more kinds and a vinyl monomer excluding the hydroxyl group-containing vinyl monomer as described above can also be used as the polyisocyanate compound. Among these polyisocyanates, a reaction between an aliphatic diisocyanate and a polyhydric alcohol can be used. It is preferable to use a polyisocyanate prepolymer as a product in terms of weather resistance and low toxicity.

The mixing ratio of these polyisocyanates (C) and the vinyl polymer polyol (A) or polyester polyol (B) is such that OH group / NCO group = 1 / 0.5
The range of 1 / to 1/3 (equivalent ratio) is preferable from the viewpoint of coating film performance.

On the other hand, typical examples of aminoplasts (D) which are curing agents of the above-mentioned various polyol components include urea formaldehyde resin and melamine formaldehyde resin.

The carboxyl group-containing vinyl polymer (E), which is one of the essential components of the clear coating for top coat (TC-1) of the present invention, is a carboxyl group-containing vinyl monomer (e-
It can be obtained by using 1) as an essential component and further using another copolymerizable vinyl monomer (e-2) as required. As the vinyl monomer (e-1), carboxyl group-containing monomers such as (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, vinyl benzoate and vinyl p-tert-butyl benzoate are particularly representative. And the other copolymerizable vinyl monomer (e-2) is (a-
The hydroxyl group-containing vinyl monomer of 1) and various momers of (a-2) can be used. The carboxyl group-containing vinyl polymer (E) can be obtained by a known and commonly used method, for example, a radical solution polymerization method. Then, in order to prepare the vinyl polymer (E) using the above-mentioned various vinyl monomers, the vinyl polymer (E-1) having a carboxyl group content of 0.1% is used.
5 to 100% by weight, preferably 1 to 70% by weight, and 99.5 to 0% by weight, preferably 99 to 30% by weight of another vinyl monomer (e-2) copolymerizable therewith are copolymerized. Just do it.

In order to prepare the vinyl polymer (E) from the various monomers listed above, any conventionally known polymerization method can be applied, but the solution radical polymerization method is the simplest.

Typical solvents used in this process include various hydrocarbons such as toluene, xylene, cyclohexane, n-hexane and octane; methanol, ethanol, iso-propanol, n-butanol, iso-butanol and sec. Various alcohols such as butanol, ethylene glycol monomethyl ether; methyl acetate,
There are various ester systems such as ethyl acetate, n-butyl acetate and amyl acetate; and various ketone systems such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, and these can be used alone or in combination.

Using such solvents and, further, various known and commonly used radical polymerization initiators such as azo-based or peroxide-based,
Polymerization may be carried out by a conventional method, and in this case, if necessary, lauryl mercaptan as a molecular weight regulator,
Octyl mercaptan, dodecyl mercaptan, 2-mercaptoethanol, octyl thioglycolate, 3-
Chain transfer agents such as mercaptopropionic acid or α-methylstyrene dimer can also be used.

Next, the compound (F) having both an epoxy group and a hydrolyzable silyl group in one molecule described above includes a vinyl polymer having both of these types of reactive groups and a silane cup having an epoxy group. A ring agent and the like are typical.

Here, such a hydrolyzable silyl group has a general formula And a reactive group which is easily hydrolyzed, such as a halosilyl group, an alkoxysilyl group, an acyloxysil group, a phenoxysilyl group, an iminooxysilyl group or an alkenyloxysilyl group.

In order to prepare the vinyl polymer (F) having both the specific amphoteric groups as described above, any of the known methods can be applied, but γ- (meth) acryloyloxypropyltrimethoxysilane, γ- (meth) ) Acryloyloxypropylmethyldimethoxysilane, γ- (meth) acryloyloxypropyltriisopropenyloxysilane,
a hydrolyzable silyl group such as γ- (meth) acryloyloxypropyltriiminooxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl (tris-β-methoxyethoxy) silane, vinyltriacetoxysilane or vinyltrichlorosilane; Vinyl monomers having an epoxy group such as (β-methyl) glycidyl (meth) acrylate, allyl glycidyl ether, di (β-methyl) glycidyl malate or di (β-methyl) glycidyl fumarate. And, if necessary, solution radical copolymerization using various monomers as described above as other vinyl monomers copolymerizable with amino group-containing vinyl monomers. Or γ-mercaptopropyltrimethoxysilane, γ-mercapto B pills triethoxysilane, .gamma.-mercaptopropyl methyl dimethoxy silane,
In the presence of a chain transfer agent such as γ-mercaptopropyltriisopropenyloxysilane or γ-mercaptopropyltriiminooxysilane, a monomer mixture containing an epoxy group-containing vinyl monomer as an essential component as described above is used. A method such as solution radical (co) polymerization is mentioned as a simple method.

In addition, in order to prepare the compound (F) by the above-described method, it is a matter of course that the hydrolyzable silyl group-containing monomers as described above can be used in combination.

Next, typical examples of the epoxy group-containing silane coupling agent described above include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, adducts of glycidol with γ-glycidoxypropyltriisopropenyloxysilane, γ-glycidoxypropyltriiminooxysilane, γ-isocyanatopropyltriisopropenyloxysilane or γ-isocyanatopropyltrimethoxysilane, or Adducts of γ-aminopropyltrimethoxysilane and the like with a diepoxy compound.

The curable resin composition (TC-1) used in the practice of the present invention comprises the above-mentioned catalyst (G) for hydrolysis-condensation of a hydrolyzable silyl group and / or the above-mentioned vinyl polymer (E). In the case where the reaction catalyst (H) between the carboxyl group of the compound (F) and the epoxy group of the compound (F) is converted, better curability can be obtained.

Typical examples of the catalyst (G) include basic compounds such as sodium hydroxide, lithium hydroxide, potassium hydroxide and sodium methylate; tetraisopropyl titanate, tetrabutyl titanate, tin octylate, lead octylate , Cobalt octylate, zinc octylate, calcium octylate, lead naphthenate, cobalt naphthenate, di-n-butyltin diacetate, di-n-butyltin dioctate, di-n-butyltin dilaurate or di-n-butyltin malate Metal-containing compounds such as p-toluenesulfonic acid, trichloroacetic acid, phosphoric acid,
Examples include acidic compounds such as monoalkyl phosphoric acid, dialkyl phosphoric acid, monoalkyl phosphoric acid or dialkyl phosphoric acid, monoalkyl phosphorous acid or dialkyl phosphorous acid.

Also, typical catalysts (H) include imidazole, 2-methylimidazole, 2-methylimidazole, and the like.
Imidazoles such as dodecyl imidazole; amines such as triethylamine and tributylamine; quaternary ammonium salts such as tetrabutylammonium chloride and cetyltrimethylammonium bromide; and phosphorus-containing compounds such as triphenylphosphate and triethylphosphate triphenylphosphine. .

From the (E) and (F) components listed above, and further from the (G) and / or (H) components, a so-called multilayer coating finish such as a two-coat one-bake system or a three-coat two-bake system is used. To prepare a curable resin composition of clear paint for top coat (TC-1) for (E)
For one equivalent of the carboxyl group present in the component,
Component (F) may be blended in such a ratio that the epoxy group present in the component is about 0.2 to 5 equivalents. If necessary, component (G) and / or component (H) may be added in an amount of about 0.01 to 10% by weight based on the total amount of both components (E) and (F).

The room-temperature-curable resin composition further includes, if necessary, an organic or inorganic pigment, a flow control agent, an anti-separation agent, an ultraviolet absorber or an antioxidant; Various additives; cellulose derivatives such as nitrocellulose or cellulose acetate butyrate; or various resins such as chlorinated polyethylene, chlorinated polypropylene, petroleum resin or chlorinated rubber can be added and blended. .

In order to carry out the coating finishing method of the present invention using each of the resin compositions obtained as described above, first, a base coat paint (BC-1) is applied as a first layer, and then a semi-dried or dried state is obtained. After that, the second layer was coated with a top coat paint (TC-1), and then 120
What is necessary is just to heat-harden at the temperature of about 160 degreeC for 20 to 40 minutes.

In carrying out such a paint finishing method of the present invention, for the coating of the base coat paint and the top coat paint, respectively, an air spray coating method or an electrostatic spray coating method has a cosmetic effect. It is suitable to be able to sufficiently exert the effect, and the film thickness of the base coat paint (hereinafter referred to as dry film thickness) is preferably in the range of 5 to 50 microns, more preferably in the range of 10 to 20 microns. Is appropriate, while the thickness of the top coat paint is preferably in the range of 10 to 100 μm, and more preferably 1 to 100 μm.
A range of 0-60 microns is appropriate.

Further, the coating interval between the base coat and the top coat is preferably at a temperature of about 20 ° C. within a range of 1 to 45 minutes, and more preferably within a range of 2 to 20 minutes. If you want to force dry the membrane,
It only needs to be heated with warm air of 60 to 80 ° C for 0.5 to 5 minutes.

That is, it is preferable that the top coat is applied after the coating film of the base coat has been brought to a touch-dry or semi-cured dry state under the above-mentioned drying conditions.

On the other hand, in the case of heating and drying the top coat, usually drying for about 20 to 40 minutes with warm air at 120 to 160 ° C.
Although preferred in terms of curability and productivity, of course, depending on the type and properties of the base coat paint (BC-1) and the top coat paint (TC-1),
Changing the drying / curing conditions as appropriate,
No problem.

The coating finishing method of the present invention can be applied to any field and any object to be coated in which such a two-coat one-bake method or a three-coat two-bake method is used. And for products in heavy industry related fields such as elevators, escalators, tractors, bulldozers, etc.

〔Example〕

Next, the present invention will be described more specifically with reference examples and examples. In the following, all parts and percentages are by weight unless otherwise specified.

Reference Example 1 [Preparation Example of Vinyl Polymer Polyol (A)] A reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet tube was charged with 560 parts of toluene and 240 parts of n-butyl acetate. In a nitrogen atmosphere, the temperature was raised to 80 ° C., 450 parts of methyl methacrylate, 390 parts of ethyl acrylate, 150 parts of β-hydroxyethyl methacrylate.
Parts, 10 parts of methacrylic acid, 5 parts of azobisisobutyronitrile (AIBN), 10 parts of tert-butyl peroxyoctoate (TBPO), 140 parts of toluene and 60 parts of n-butyl acetate. The mixture was added dropwise over 4 hours, and after completion of the addition, the polymerization reaction was continued at the same temperature for 8 hours. The nonvolatile content was 50.6%, and the Gardner viscosity at 25 ° C. (hereinafter the same) was VW. And the acid value is 3.3mg KOH /
g of the desired polyol solution was obtained. Hereinafter, this is abbreviated as polyol (A-1).

Reference Example 2 [Preparation Example of Carboxyl Group-Containing Vinyl Polymer (E)] A reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet tube was charged with 200 parts of xylene and 100 parts of n-butanol. Then, the temperature is increased to 125 ° C under a nitrogen atmosphere,
Mixture consisting of 120 parts of styrene, 240 parts of methyl methacrylate, 180 parts of butyl acrylate, 10 parts of methacrylic acid, 6 parts of azobisisobutyronitrile, 9 parts of tertiary butyl peroctoate and 100 parts of xylene Was added dropwise over 6 hours. After the completion of the dropwise addition, the temperature was maintained at the same temperature for 8 hours to continue the polymerization reaction.
%, The viscosity is W to X, and the solution acid value is 39 (mg KOH /
g) A solution of the target polymer (E) was obtained. This is abbreviated as polymer (E-1).

Reference Example 3 (same as above) Non-volatile compound was prepared in exactly the same manner as in Reference Example 2 except that methacrylic acid was completely absent, and instead, 5 parts of acrylic acid and 5 parts of fumaric acid were used in combination. Is 61.2%, the viscosity is Y, and the solution acid value is 38.1 (mg K
OH / g) was obtained. This is abbreviated as polymer (E-2).

Reference Example 4 [Preparation agent for compound (F) having epoxy group and hydrolyzable silyl group] In a reaction vessel similar to Reference Example 2, 300 parts of xylene was charged, and the temperature was raised to 110 ° C under a nitrogen atmosphere. 168 parts of glycidyl methacrylate, 150 parts of γ-methacryloyloxypropyltrimethoxysilane, 282 parts of ethyl acrylate, 3 parts of AIBN, 18 parts of TBPO and 100 parts of xylene
Part of the mixture was added dropwise over 6 hours, and after completion of the addition, the polymerization was continued at the same temperature for 8 hours to continue the polymerization reaction. The non-volatile content was 60.5%, the Gardner viscosity was BC, and the epoxy equivalent was 838. A solution of the desired compound (F) was obtained. This is abbreviated as compound (F-1).

Example 1 and Comparative Example 1 The respective resin solutions obtained in Reference Examples 1 and 2 and various compounds as shown in Table 1 were mixed in a conventional manner according to the formulation shown in Table 1. After preparing a top clear paint with carboxyl group / epoxy group = 1/1 (equivalent ratio) and a paint for base coat, xylene / toluene / ethyl acetate = 30/50/20 (weight ratio) Dilute to spray viscosity with solvent. Next, the base coat paint and the top clear paint are applied by air spray so that the dry film thickness becomes 15 μm and 40 μm, respectively, and the application interval of these two paints becomes 2 minutes. After that, 2 at 140 ° C
Heating was performed for 5 minutes to obtain a cured coating film.

Next, physical properties of the cured coating film thus obtained were evaluated.

 The results are summarized in the same table.

Example 2 Each of the resin solutions obtained in Reference Examples 1, 3 and 4 and various compounds as shown in Table 1 were coated by a conventional method according to the formulation shown in the table. And
After preparing a top clear paint with a carboxyl group / epoxy group = 1/1 (equivalent ratio) and a paint for base coat, spray viscosity with a mixed solvent of xylene / toluene / ethyl acetate = 30/50/20 (weight ratio) Diluted. Next, the base coat paint and the top clear paint are applied by air spray so that the dry film thickness becomes 15 μm and 40 μm, respectively, and the application interval of these two paints becomes 2 minutes. After heating, further apply the same top clear paint on the cured coating film by air spray so that the dry film becomes 40 microns, and then heat and dry at 140 ° C for 20 minutes. Was performed to obtain a cured coating film.

Then, about the cured coating film thus obtained,
Various performances were evaluated. The results thus obtained are shown in the table.

[Effects of the Invention] Thus, according to the method of the present invention, a composite cured coating film having excellent coating film performance such as gloss and sharpness and various other coating properties such as acid resistance is formed. can do.

Therefore, according to the method of the present invention, it is more excellent in acid resistance than a case where a conventional paint such as a thermosetting acrylic resin paint or an amino alkyd resin is used, and it is possible to form a product having a good paint finish. it can.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI C09D 133/02 C09D 133/02 (56) References JP-A-62-187749 (JP, A) JP-A-62-253670 (JP) JP-A-62-252478 (JP, A) JP-A-3-250080 (JP, A) JP-A 1-270979 (JP, A) JP-A-2-261569 (JP, A) 60-48172 (JP, A) JP-A-58-138762 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 1 / 36,1 / 38 B05D 5/06 101 B05D 7 / 24 301 B05D 7/24 302 B09D 5/00 B09D 133/02 C08L 33/02

Claims (6)

(57) [Claims] A curable resin composition containing polyols and aminoplasts as essential components is used as a base coat paint, while a carboxyl group-containing vinyl polymer is used as a top clear paint. And a compound having both an epoxy group and a hydrolyzable silyl group as an essential component. 2. A curable resin composition containing a polyol and an aminoplast as essential components as a base coat paint, while a carboxyl group-containing vinyl polymer and a carboxyl group-containing polymer are used as a top clear paint. A compound having both an epoxy group and a hydrolyzable silyl group, and a catalyst for hydrolysis or condensation of the hydrolyzable silyl group, comprising a curable resin composition containing as an essential component, Painting finish method. 3. A base coat paint containing a curable resin containing a metallic powder and / or a coloring pigment as an essential component for forming a coating film, and then the curable resin is applied to the coated surface thus obtained. In a two-coat / one-bake coating finishing method comprising applying a top clear paint containing as an essential component, and then curing, a polyol and an aminoplast are used as essential components as the base coat paint. Resin composition containing a carboxyl group-containing vinyl resin and a compound having both an epoxy group and a hydrolyzable silyl group in one molecule as the top clear coating composition A paint finishing method characterized by using: 4. A base coat paint containing a curable resin containing a metallic powder and / or a color pigment as an essential component for forming a coating film, and then the curable resin is applied to the coated surface thus obtained. In a two-coat / one-bake coating finishing method comprising applying a top clear paint containing as an essential component, and then curing, a polyol and an aminoplast are used as essential components as the base coat paint. A curable resin composition containing a carboxyl group-containing vinyl polymer, a compound having an epoxy group and a hydrolyzable silyl group in one molecule, and a hydrolyzable silyl group Use of a curable resin composition containing a catalyst for hydrolysis or condensation of And I said, paint finishing method. 5. A base coat paint containing a curable resin mixed with a metallic powder and / or a coloring pigment as an essential component for forming a coating film, and then the curable resin is applied to the coated surface thus obtained. Is coated and cured as an essential component for forming a coating film, and thereafter, the top clear coating material is further coated and cured to form a three-coat / two-bake coating finishing method. As a base coat coating, a curable resin composition containing polyols and polyisocyanates or aminoplasts as essential components is used. On the other hand, as the top clear coating, a carboxyl group-containing vinyl polymer and A compound having both an epoxy group and a hydrolyzable silyl group Characterized by using the curable resin composition containing a catalyst for hydrolysis or condensation of groups as an essential component, paint finishing method. 6. The compound having both an epoxy group and a hydrolyzable silyl group in one molecule as described above, wherein the compound having the epoxy group and the hydrolyzable silyl group at the terminal and / or the side chain of the main chain. The coating finishing method according to claim 1.