Aqueous topcoat composition
A water-based topcoat and composition technology, applied in the fields of automotive coatings and auto body topcoats, can solve the problems of short development time of low-VOC technology, insufficient supporting technical means, and decreased matching between automotive coatings and sealants.
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Embodiment 1
[0067] Use the ingredients and content listed in the following table 1 to prepare the water-based topcoat composition Ex-1 provided by the present invention, the specific steps are: (1) acrylic resin, polyester resin, polyurethane are added in the reactor under stirring conditions successively (2) adjust the pH value of the mixture described in step (1) to 8.2-8.7, and add appropriate deionized water to adjust the viscosity of the system; (3) in the mixture described in step (2), stir and add defoamer , substrate wetting agent, melamine formaldehyde resin (a), melamine formaldehyde resin (b) and color paste; (4) adjust the pH of the system to 8.2-8.7.
[0068] Table 1. Aqueous topcoat composition Ex-1 according to the present invention
[0069]
[0070]
[0071] a Prepared according to the method described in Example A of US2015 / 0210883, the average particle size is 200nm, and the solid content is 20-30wt%;
[0072] b Prepared according to the method described in Exam...
Embodiment 2
[0077] Use the ingredients and content listed in the following table 2 to prepare the water-based topcoat composition Ex-2 provided by the present invention, the specific steps are: (1) acrylic resin, polyester resin, polyurethane are added in the reactor successively under stirring conditions (2) adjust the pH value of the mixture described in step (1) to 8.2-8.7, and add appropriate deionized water to adjust the viscosity of the system; (3) in the mixture described in step (2), stir and add defoamer , substrate wetting agent, melamine formaldehyde resin (a), melamine formaldehyde resin (b) and a part of rheology additive; (4) in another stirring tank, put the aluminum powder in the effect pigment and passivator, solvent Mix and stir to make the aluminum powder evenly disperse; (5) take part of the mixture in step (3), mix it with the pearlescent powder in the effect pigment according to a certain ratio (greater than about 4:1), and disperse the pearlescent powder; (6) mix the...
Embodiment 3
[0086] Use the ingredients and content listed in the following table 3 to prepare the water-based topcoat composition Ex-3 provided by the present invention, the specific steps are: (1) acrylic resin, polyester resin, polyurethane are added in the reactor under stirring conditions successively (2) adjust the pH value of the mixture described in step (1) to 8.2-8.7, and add appropriate deionized water to adjust the viscosity of the system; (3) in the mixture described in step (2), stir and add defoamer , substrate wetting agent, melamine formaldehyde resin (a), melamine formaldehyde resin (b), color paste and a part of rheology additive; (4) in another stirring tank, put the aluminum powder and passivation in the effect pigment (5) take part of the mixture in step (3), mix it with the pearlescent powder in the effect pigment according to a certain ratio (greater than about 4:1), and disperse the pearlescent powder; ( 6) Add the mixture in steps (4) and (5) to the mixture prepar...
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