JPH11140380A - Two-package water-based coating composition having visualized pot life - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-package water-based coating composition having a visualized pot life, used for cold setting and forming a coating film excellent in weathering resistance, durability, adhesion and staining resistance without detriment to crosslinkability. SOLUTION: This composition is prepared by mixing, just prior to use, a base coating material (I) containing at least 10 wt.% (in terms of the solids content based on the vehicle) water-dispersed copolymer containing isocyanate- reactive functional groups and at least 0.2 wt.% (in terms of the solids content based on the vehicle) water-soluble polymer having isocyanate reactive functional groups with a crosslinking agent (II) containing at least two isocyanate groups in the molecule and used in such an amount that 0.2-3.0 mol of the isocyanate groups contained in II are present per mol of the isocyanate groups contained in I.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-part aqueous coating composition, and more particularly, to a two-part aqueous coating composition without lowering crosslinkability.
The present invention relates to a two-pack aqueous coating composition that can form a coating film having excellent weather resistance, durability, adhesion, and stain resistance, and has a visualized pot life for room temperature drying. The composition of the present invention comprises:
It is applicable to painting of interior and exterior of buildings, bridges, ships, automobiles, vehicles, and the like.

[0002]

BACKGROUND OF THE INVENTION The present applicant has applied a base paint containing a specific acrylic copolymer emulsion and a plasticizer and / or an organic solvent as a two-pack type isocyanate-cured paint, thereby making it possible to obtain low-temperature and high-humidity paints. It has been found that an aqueous paint which can be dried at room temperature and has excellent stain resistance, durability, water resistance and the like can be obtained without lowering the crosslinkability in an environment (Japanese Patent Application No. 8-195836).

[0003] In general, solvent-based two-pack isocyanate-cured paints have not been applied because the paints gel after the pot life (pot life). However, the two-pack type isocyanate-cured aqueous paint does not gel even after the pot life, so that if the paint beyond the pot life is erroneously applied, the performance of the coating film deteriorates. Was.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a water-dispersible copolymer containing an isocyanate-reactive functional group and an isocyanate-reactive functional group The inventors have found that it is possible to gel a paint that has passed the pot life by using a water-soluble polymer containing a group in combination, and have completed the present invention.

That is, the present invention relates to a water-soluble copolymer containing an isocyanate-reactive functional group, which contains a water-dispersible copolymer (A) having a solid content of 10% by weight or more in a vehicle component. Crosslinking agent (II) containing a compound containing at least two or more isocyanate groups in one molecule in base paint (I) containing polymer (B) in a vehicle component at a solid content of 0.2% by weight or more. The amount of the isocyanate group contained in the crosslinking agent (II) is in the range of 0.2 to 3.0 mol per 1 mol of the isocyanate-reactive functional group contained in the base paint (I). It is intended to provide a two-pack water-based paint composition in which the pot life is visualized, which is characterized by mixing immediately before use.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the two-pack type aqueous coating composition of the present invention will be described in more detail.

Base paint (I): The base paint (I) used in the present invention is a water-dispersible copolymer (A) containing an isocyanate-reactive functional group and a water-soluble polymer containing an isocyanate-reactive functional group. The base paint contains (B) as an essential vehicle component.

Water containing isocyanate-reactive functional groups
Dispersion-type copolymer (A): The water-dispersion-type copolymer (A) used in the base coating material (I) in the present invention is preferably an acid value of 5 to 200 mgKOH / g, preferably a hydroxyl value of 5 to 150 mgKOH. / G, preferably a glass transition temperature of -10 to 80 ° C, preferably a weight average molecular weight of 1,000.
A polyol resin such as an acrylic resin, a polyester resin, a polyurethane resin, a silicone resin, or a fluorine resin, preferably a monomer containing a hydroxyl group-containing monomer and another unsaturated monomer copolymerizable therewith. An acrylic emulsion obtained by emulsion polymerizing the mixture in the presence of an emulsifier.

The copolymer (A) has a hydroxyl value of 5 mg KO
If it is less than H / g, the crosslinking point is poor and the physical properties of the coating film are insufficient. On the other hand, if it exceeds 150 mgKOH / g, the initial water resistance is lowered and the viscosity of the coating is increased, so that the coating workability is undesirably reduced. The acid value of the copolymer (A) is 2
If it exceeds 00 mgKOH / g, the water resistance of the coating film is undesirably reduced. If the glass transition temperature of the copolymer (A) is less than -10 ° C, the formed film is inferior in water resistance and stain resistance,
On the other hand, when the temperature exceeds 80 ° C., an excessive amount of a plasticizer or an organic solvent for forming a film is required, so that initial drying property is deteriorated and cracks and the like are easily generated in a formed film with the lapse of time.

When the weight average molecular weight of the copolymer (A) is less than 1,000, the weather resistance and water resistance of the formed film are inferior, and when it exceeds 400,000, the compatibility with other paint components is inferior. It is not preferable because the film properties and curability decrease.

Examples of the hydroxyl-containing monomer used in the copolymer (A) include acrylic acid or methacrylic acid such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate. Hydroxyalkyl esters having 1 to 6 carbon atoms; hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether
Ters; equimolar adducts of polyetherpolyols such as ethylene glycol and the like (polycarbonates having 2 to 20 carbon atoms) and polyethylene glycol and unsaturated carboxylic acids such as (meth) acrylic acid; Monoethers of a polyether polyol such as polyethylene glycol and a hydroxyl group-containing monomer such as 2-hydroxyethyl (meth) acrylate may be used, and one or more of them may be appropriately selected. Can be used.

Other unsaturated monomers used in the copolymer (A) include, for example, methyl (meth) acryl
, Ethyl (meth) acrylate, n-butyl (meth)
Acrylate, i-butyl (meth) acrylate, t-
C1-C24 alkyl esters of acrylic acid or methacrylic acid such as butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate, or Cycloalkyl ester; unsaturated carboxylic acid such as (meth) acrylic acid, sulfoethyl (meth) acrylate and its sodium or ammonium salt; dimethylaminoethyl (meth) acrylate, (meth) acrylamide; styrene, α- Vinyl aromatic compounds such as methylstyrene and vinyltoluene; vinyl acetate, vinyl chloride, vinyl ether, (meth) acrylonitrile; monomers containing alkoxysilyl groups such as vinyltrimethoxysilane and γ- (meth) acryloyloxypropyltrimethoxysilane -; Perfluo Perfluoroalkyl (meth) acrylates such as robutylethyl (meth) acrylate and perfluorooctylethyl (meth) acrylate; fluoroolefins; and one or more of these can be appropriately selected and used.

In the present invention, the water-dispersed copolymer (A) is contained in the vehicle component of the base coating material (I) in a solid content of at least 10% by weight, preferably at least 50% by weight, more preferably at least 80% by weight. % Or more. The content is 10
When the amount is less than the weight%, it is not preferable because the coating properties such as water resistance and durability cannot be sufficiently obtained.

Water containing isocyanate-reactive functional groups
Soluble polymer (B): The water-soluble polymer (B) containing an isocyanate-reactive functional group used in the base paint (I) in the present invention is a water-soluble polymer containing an isocyanate-reactive functional group. Any acid can be used without any particular limitation, but preferably has an acid value of 5 to 200 mgKOH / g, preferably a hydroxyl value of 5 to 150 mgKOH / g, preferably has a glass transition temperature of -10 to 80 ° C, and preferably has a weight average molecular weight of 1,000. ~ 400,000 water-soluble acrylic resins,
A water-soluble polyester resin, a water-soluble polyurethane resin, or the like is used.

In the present invention, the water-soluble polymer (B) containing the isocyanate-reactive functional group is contained in the vehicle component of the base paint (I) in a solid content of 0.2% by weight or more. If the content is less than 0.2% by weight, gelling of the coating does not occur, which is not preferable.

If the amount of the water-soluble polymer (B) in the water-dispersible copolymer (A) is too small, gelling of the paint will not occur, and if it is too large, the gelation time will be shortened. Since the pot life is shortened, the water-soluble polymer (B)
The mixing ratio of the water-dispersed copolymer (A) and the water-dispersed copolymer (A) is preferably in the range of 1:99 to 30:70 in terms of solid content ratio.

The base paint (I) may further contain, if necessary, pigments such as coloring pigments and extender pigments; pigment dispersants, film-forming auxiliaries, curing catalysts, defoamers, thickeners, preservatives. , A paint additive such as an antifreezing agent.

Among them, as the curing catalyst, a conventionally known curing catalyst can be used without particular limitation, for example, triethylamine,
Amine catalysts such as tripropylamine, tributylamine, diethanolamine and triethanolamine; dibutyltin dilaurate, dibutyltin oxide, tin octylate, lead naphthenate and cobalt naphthenate can be used; For example, polyethers, copolymers of polysiloxane and polyether, condensates of polysiloxane and silicic acid, and metal soaps can be used.

Crosslinking agent (II): In the present invention, the crosslinking agent (II) contains a compound containing at least two or more isocyanate groups in one molecule, and may be used as it is or together with a surfactant. Base paint (I)
Whatever can be added and stirred and mixed,
Further, from the viewpoint of water dispersibility, it is preferable to use the polyisocyanate compound after modifying it with a surfactant or the like. Such a modified product can be used without any particular limitation as long as it has a hydrophilic chain introduced therein.
Reaction product (i) of an alkoxypolyalkylene glycol with a polyisocyanate compound according to the method described in JP-A-5-7472, polyisocyanate according to the method described in JP-A-7-10950 (Ii) a mixture of an emulsifier obtained by reacting an alkoxypolyalkylene glycol with a dialkanolamine with a polyisocyanate compound and a polyisocyanate compound;
Reaction product or mixture of the above (i) or (ii) with a silane coupling agent having a hydroxyl group or an amino group at one end and an alkoxysilyl group at the other end according to the method described in US Pat. And the like.

Examples of the polyisocyanate compound include aliphatic diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate and isophorone diisocyanate. Alicyclic diisocyanates such as 4.4'-methylenebis (cyclohexyl isocyanate) and isophorone diisocyanate; xylylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate; And aromatic diisocyanates such as polyphenylmethane diisocyanate (hereinafter referred to as polymeric MDI); and similar compounds such as isocyanurates and burettes. These may be used alone or in combination of two or more. Can be used.

The reaction product (i) of the above polyisocyanate compound with an alkoxypolyalkylene glycol is
A water-dispersible polyisocyanate which is reacted so that the residual isocyanate content becomes 20 to 30% by weight. Specifically, the above-mentioned polyisocyanate compound and alkoxypolyalkylene glycol are mixed with isocyanate. −
And the equivalent ratio of g-hydroxyl group is 3 to 30, preferably 10 to 25.
It is appropriate to make the reaction to a degree. The alkoxypolyalkylene glycol has a general formula of R ₁ O—
(R ₂ O) _n -H (where R ₁ is an alkyl group, R ₂ is an alkylene group, and n is 2 to 100), for example, methoxypolymethylene ether terglycol, methoxypolyethylene ether Terglycol, ethoxypolyethylene ether terglycol, ethoxypolybutylene ether terglycol, etc., having a molecular weight of 100 to 4,000.
Those having a range of 0, preferably 400 to 2,000 can be used.

Next, a mixture (ii) of an emulsifier obtained by reacting the above-mentioned polyisocyanate compound with an alkoxypolyalkylene glycol and a dialkanolamine, and a polyisocyanate compound are water-dispersible polyisocyanate. A composition comprising an emulsifier and a polyisocyanate compound having an isocyanate content of 3 to 5;
It is appropriate to mix them so as to be 0% by weight, preferably 5 to 30% by weight, and these may be partially reacted.

The emulsifier comprises a polyisocyanate compound and an alkoxypolyalkylene glycol, which is an isocyanate compound.
And the equivalent ratio of (g) group / hydroxyl group is 3 to 30, preferably 10 to 2
After the reaction, the unreacted polyisocyanate compound is removed, and then the dialkanolamine is converted to an isocyanate group / amino group equivalent ratio of 0.5-2, preferably 0.8-1. It is obtained by reacting to about 0.2. As the alkoxypolyalkylene glycol used in the production of the emulsifier, the same ones as described in the above (i) can be used. As the dialkanolamine, for example, dimethanolamine, diethanolamine, diisopropanolamine, diethanolaniline Etc. can be used.

Next, the reaction product (iii) of the above reaction product (i) or the mixture of the polyisocyanate (ii) and the silane coupling agent having a hydroxyl group or an amino group at one terminal and an alkoxysilyl group at the other terminal is The equivalent ratio of the isocyanate group of the silane coupling agent to the isocyanate group of the water-dispersible hydrophilic polyisocyanate of the above (i) or (ii) isocyanate group / hydroxyl group or amino group. By reacting at 3 to 30, a reaction product or mixture having a residual isocyanate content of 3 to 50% by weight, preferably 5 to 30% by weight can be obtained. If the content is less than 3% by weight, the water resistance of the resulting coating film is poor, while if it exceeds 50% by weight, the water dispersibility of the crosslinking agent deteriorates, which is not desirable.

The silane coupling agent used for producing the above reaction product (iii) is, for example, N-β-
(Aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane and the like. The reaction product (iii)
Alkoxypolyalkylene glyco used for the production of
The same thing as the above (i) can be used as the file.

Among the above (i) to (iii), the crosslinking agent (I)
As (I), (iii) having a good balance between hydrophilicity and hydrophobicity is particularly preferable from the viewpoint of stability when dispersed in water.

The two-pack type aqueous coating composition of the present invention comprises the above base coating (I) and a crosslinking agent (II), and contains 1 mol of an isocyanate-reactive functional group contained in the base coating (I). The mixture is used immediately before use so that the isocyanate group contained in the crosslinking agent (II) becomes 0.2 to 3.0 mol, preferably 0.5 to 2.5 mol.

The two-part aqueous coating composition of the present invention can be applied to various materials by a conventionally known method such as spray coating, roller coating, brush coating, and dipping. The amount of coating is not particularly limited, but generally about 50 to 400 g / m ² is appropriate.

[0029]

According to the present invention, when the two-pack type aqueous coating composition of which the pot life is visualized is used, the coating gels after the pot life, so that it is not erroneously applied.

[0030]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. “Parts” and “%” are “parts by weight” respectively.
And "% by weight".

Production Example of Aqueous Acrylic Copolymer Dispersion Production Example 1 309 parts of deionized water was placed in a two-liter four-necked flask equipped with a stirrer, a thermometer, a reflux tube, and a nitrogen introduction tube, and New
1.1 parts of col707SF (manufactured by Nippon Emulsifier Co., anionic surfactant, nonvolatile content: 30%) was added, and the mixture was replaced with nitrogen and kept at 85 ° C with stirring. To this, 21 parts of the pre-emulsion obtained by emulsifying the following composition and 0.32 parts of ammonium persulfate were added, and 20 minutes after the addition, the remaining pre-emulsion was dropped over 4 hours.

Deionized water 325 parts Newcol 707SF 43.3 parts Methyl methacrylate 45.5 parts Styrene 130 parts n-butyl methacrylate 201.5 parts 2-ethylhexyl methacrylate 201.5 parts 2-hydroxy Ethyl methacrylate 65 parts Acrylic acid 6.5 parts Ammonium persulfate 1.3 parts After maintaining at 85 ° C for 2 hours from the end of dropping, the temperature was lowered to 40 ° C. The pH was adjusted to 8.5 with aqueous ammonia, and the solid content was 5
Acrylic copolymer aqueous dispersion (a) having 0%, resin hydroxyl value of 42 mgKOH / g and weight average molecular weight of 150,000 was obtained.

Production Example 2 of Acrylic Aqueous Solution Production Example 2 368.6 parts of ethylene glycol monobutyl ether was added to a 2-liter four-necked flask equipped with a stirrer, a thermometer, a reflux tube, and a nitrogen inlet tube, followed by purging with nitrogen. The mixture was kept at 85 ° C. with stirring. The following mixture was added dropwise thereto over 4 hours.

13. Styrene 130 parts n-butyl methacrylate 195 parts 2-ethylhexyl methacrylate 130 parts 4-hydroxybutyl acrylate 97.5 parts acrylic acid 97.5 parts 2,2'-azobis (2,4-dimethylvaleronitrile) 5 parts After maintaining at 85 ° C. for 1 hour from the end of the dropwise addition, the following mixture was added dropwise over 1 hour.

Ethylene glycol monobutyl ether 65 parts 2,2′-azobis (2,4-dimethylvaleronitrile) 6.5 parts After the temperature was maintained at 85 ° C. for 1 hour from the end of the dropping, the temperature was lowered to 40 ° C. 875.3 parts of ammonia water and deionized water are added and dissolved in water to adjust the pH to 8.5, and the solid content is 35%.
Resin hydroxyl value 58mgKOH / g, weight average molecular weight 4
An acrylic copolymer aqueous solution (b) of 000 was obtained.

Preparation Example of Polyester Aqueous Solution Preparation Example 3 Neopentyl glycol 426 was placed in a reaction vessel equipped with a stirrer, thermometer, reflux tube, nitrogen inlet tube, rectification tower, and water separator.
Parts, 184.4 parts of trimethylolpropane, 316 parts of adipic acid and 448.8 parts of isophthalic acid, and the temperature was first raised to 160 ° C. using a rectification column, and then 160 ° C.
To 230 ° C. over 3 hours.
After maintaining at 230 ° C. for 1 hour, the operation was switched to a water separator, an appropriate amount of toluene was added, and the reaction was carried out while keeping the temperature at 230 ° C. while separating water under reflux of toluene. The toluene was quickly distilled off through nitrogen. Thereafter, the mixture is cooled to 170 ° C., and 36.8 parts of trimellitic anhydride is added and reacted for 30 minutes.
After diluting with 4.8 parts and cooling to 50 ° C., 55.6 parts of triethylamine and 1,746.4 parts of deionized water were added and dissolved in water, pH 8.0, solid content 35%, resin acid value 2
5 mgKOH / g, resin hydroxyl value 110 mgKOH /
g, a polyester resin aqueous solution (c) having a weight average molecular weight of 10,000 was obtained.

Example of Preparation of Crosslinking Agent A four-necked flask equipped with a stirrer, thermometer, reflux tube and nitrogen inlet tube was charged with 225 parts of methoxypolyethylene ether glycol having a number average molecular weight of 550 and 1,6-hexamethylene. 871 parts of diisocyanate was added and reacted at 70 ° C. for 6 hours after purging with nitrogen. The resulting reaction solution was applied to a thin film distillation apparatus to remove unreacted 1,6-hexamethylene diisocyanate, thereby obtaining a monoisocyanate compound having methoxypolyethylene ether glycol.

Next, 37 parts of diethanolamine was placed in a separate flask, and 250 parts of the methoxypolyethylene ether glycol-containing monoisocyanate compound obtained in the preparation example was cooled to 70 ° C. while air-cooling after purging with nitrogen.
The solution was gradually dropped so as not to exceed. After completion of the dropwise addition, the mixture was stirred at 70 ° C. for about 1 hour, and it was confirmed that the isocyanate group had disappeared. Thus, an emulsifier was obtained.

In a separate flask, 42 parts of the emulsifier obtained above and “Takenate D170HN” (manufactured by Takeda Pharmaceutical Company Limited, 1,
Trimer of 6-hexamethylene diisocyanate) 358
Of N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, and the mixture was stirred at 70 ° C. for 6 hours to obtain a water-dispersible polyisocyanate. The isocyanate content was 17.7% and the viscosity was 800 cps.

EXAMPLES AND COMPARATIVE EXAMPLES Raw materials having the following composition were placed in a 4-liter stainless steel container.
The mixture was stirred with a disperser for 30 minutes to obtain a pigment dispersion paste.

960 parts of tap water “Nopco Santo K” (manufactured by San Nopco, a pigment dispersant) 48 ° “Adecanol VH420” (manufactured by Asahi Denka Co., Ltd., thickener) 16 ”“ SN Deformer-A63 ”(San Nopco 32% Titanium White 3520 {Ethanol 288} Next, in a 1-liter stainless steel container, the above-mentioned pigment paste and the water-dispersed copolymer obtained in the above Production Example were prepared according to the following formulation. Combine with mixing while stirring, and base paint (A) ~
(G) was prepared.

Base paint (A) 280 parts of the above pigment dispersion paste Aqueous dispersion of acrylic copolymer obtained in Preparation Example 1 (a) 465.5） Aqueous solution of acrylic copolymer obtained in Preparation Example 2 (b) 35 〃 Texanol (film-forming aid) 26.8 〃 “SN Deformer-A63” 4.9 ２５ 25% ammonia water 0.7 〃 “Primal TT-935” (manufactured by Rohm and Haas Company, thickening 4.2) "Sluroff S" (preservative, manufactured by Takeda Pharmaceutical Co., Ltd.) 0.7 {water} 165.7} Base paint (B) 280 parts of the above pigment dispersion paste Acrylic copolymer obtained in Production Example 1 Aqueous dispersion (a) 441 {Aqueous acrylic copolymer aqueous solution (b) obtained in Production Example 2 70} Texanol 25.4 {SN Deformer-A63 "4.9 {25% aqueous ammonia 0.7} Primal TT-935 "4 2〃 obtained in "Suraofu S" 0.7〃 clean water 156.6〃 base coating (C) the pigment dispersion paste 280 parts Preparation Example 1 to obtain acrylic copolymer aqueous dispersion (a) 392 〃 Production Example 2 Acrylic copolymer aqueous solution (b) 140 〃 Texanol 22.5 ＳＮ SN deformer-A63 4.9 〃 25% ammonia water 0.7 〃 Primal TT-935 4.2 〃 Sluoff S 0.7〃 water 138.5〃 base paint (D) 280 parts of the above pigment dispersion paste Acrylic copolymer aqueous dispersion (a) obtained in Production Example 1 465.5〃 Polyester resin aqueous solution obtained in Production Example 3 (C) 35 〃 Texanol 26.8 ＳＮ SN Deformer-A63 4.9 ２５ 25% ammonia water 0.7 〃 Primal TT-935 4.2 〃 Slaoff S 0.7 〃 Water supply 16 .7〃 base paint (E) The pigment dispersion paste 280 parts Preparation Example 1 to obtain acrylic copolymer aqueous dispersion (a) 441 〃 polyester resin solution obtained in Preparation Example 3 (c) 70 〃 Texanol 25.4 〃 “SN Deformer-A63” 4.9〃 25% ammonia water 0.7〃 “Primal TT-935” 4.2〃 “Slaoff S” 0.7〃 Water supply 156.6〃 Base paint (F) Pigment dispersion paste 280 parts Acrylic copolymer aqueous dispersion obtained in Production Example 1 (a) 392 {Polyester resin aqueous solution (C) obtained in Production Example 3 140 {Texanol 22.5} "SN Deformer-A63""4.9〃 of 25% aqueous ammonia 0.7〃" Primal TT-935 "4.2〃" Suraofu S "0.7〃 clean water 138.5〃 base paint (G) (comparative) the pigment Dispersed paste 280 parts Aqueous dispersion of acrylic copolymer (a) obtained in Production Example 1 490 {Texanol 28} "SN Deformer-A63" 4.9% 25% aqueous ammonia 0.7% Primal TT-935 4.2 "Sluroff S" 0.7 Water 175 Examples 1 to 6 and Comparative Example 1 Based on 100 parts by weight of resin solids of base paints (A) to (G) obtained above. The crosslinking agent obtained in the above preparation example was blended as shown in Table 1 and stirred to obtain an aqueous paint. "VP sealer white" on a slate plate (90 x 300 x 6 mm)
(Solvent type sealer manufactured by Kansai Paint Co., Ltd.)
g / m ² , coated and dried with a roller to give a coated plate, on which the coating materials obtained in Examples 1 to 6 and Comparative Example 1 were mixed with a crosslinking agent for 1 hour, 7 hours and 24 hours. later, in the spray so that the coating amount is 150 g / m ² 2
Each test plate was prepared by repeatedly applying the coating and drying at room temperature for 7 days, and various evaluations were made. Table 1 shows the results.

The test method in Table 1 is as follows.

Paint condition: ：: Applicable ×: Gelled Coating surface gloss: 60 ° mirror reflectance was measured.

Adhesion: JIS K-5400 8.5.
100 squares of 1 mm × 1 mm were prepared in accordance with the 2nd square tape method, and the tape was adhered to the surface of the square to evaluate the peeling degree of the square.

◎: No peeling at all △: Slightly peeling off of squares ×: Peeling of 1/3 or more squares

[0047]

[Table 1]

Claims (1)

[Claims] 1. A water-dispersed copolymer (A) containing an isocyanate-reactive functional group is contained in a vehicle component in a solid content of 1%.
The base paint (I) containing 0% by weight or more and a water-soluble polymer (B) containing an isocyanate-reactive functional group at a solid content of 0.2% by weight or more in a vehicle component has at least one molecule per molecule. The crosslinking agent (II) containing a compound containing two or more isocyanate groups is contained in the crosslinking agent (II) with respect to 1 mol of the isocyanate-reactive functional group contained in the base paint (I). 0.2 isocyanate group
A two-pack type water-based paint composition for visualizing pot life, wherein the water-based paint composition is mixed immediately before use so as to be in a range of from about 3.0 mol.