High-solid-content three-coating and one-baking finish paint for automobile based on waterborne acrylic polyurethane

A technology of acrylic polyurethane and water-based polyurethane, applied in the field of coatings, can solve the problems of unsatisfactory coating level, visual fullness, appearance data indicators, low standards, and high paint consumption per vehicle, and achieve excellent construction application The effect of performance, low VOC content, and excellent appearance

Pending Publication Date: 2022-06-21
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the limitations of the conventional water-based three-coat-one-bake coating system topcoat in the industry are mainly manifested in the following points: First, the solid content of the conventional topcoat is relatively low, so the amount of paint consumed by a single vehicle is relatively high; The VOC content of organic compounds is high, and most of them cannot meet the latest national VOC low standard. Third, there are currently a few topcoats that can achieve high solid content, but their appearance performance, that is, the smoothness and fullness of the coating 1. The appearance data indicators (long wave, short wave, DOI, etc.) cannot reach a satisfactory level; Fourth, the current conventional three-coated and one-baked product cannot achieve better anti-stone due to the low film thickness of the intermediate coating. impact performance, there is a common problem of a large amount of paint falling off in the stone impact test

Method used

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  • High-solid-content three-coating and one-baking finish paint for automobile based on waterborne acrylic polyurethane
  • High-solid-content three-coating and one-baking finish paint for automobile based on waterborne acrylic polyurethane
  • High-solid-content three-coating and one-baking finish paint for automobile based on waterborne acrylic polyurethane

Examples

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preparation example Construction

[0032] The particle size of the dispersion particle of the aqueous acrylic polyurethane emulsion A is 60-150 nm, the solid acid value is 10-20 mgKOH / g, and the hydroxyl value is 20-50 mgKOH / g (exemplarily, the hydroxyl value includes but is not limited to 25 ~50mgKOH / g, 25~45mgKOH / g, 25~40mgKOH / g, 25~35mgKOH / g, 30~50mgKOH / g, 35~50mgKOH / g, 40~50mgKOH / g, etc.). The preparation method of this water-based acrylic polyurethane emulsion A comprises the following steps:

[0033] In a preferred example, the preparation of the water-based acrylic polyurethane emulsion A includes the following steps:

[0034] Under nitrogen protection, mix water-based polyurethane A, emulsifier and water, stir and heat up to 70-90°C to obtain the first mixture;

[0035] Add the acrylic monomers to the water in which the emulsifier is dissolved in turn, and stir to make the acrylic monomers fully pre-emulsified to obtain the monomer pre-emulsion;

[0036] At a temperature of 70-90 °C, part of the monom...

Embodiment 1

[0090] A high-solid three-coat-one-bake intermediate coating for automobiles based on water-based acrylic polyurethane consists of the following components in corresponding parts by mass:

[0091]

[0092] Wherein, the hydroxyl value (based on solid content) of the water-based acrylic emulsion is 5-20 mgKOH / g, the pH value is 6.5-7.8, the particle size is 90-150 nm, and the solid acid value is 10-20 mgKOH / g.

[0093] The water-based polyurethane resin is gradually polycondensed and polymerized by polyester prepolymer and polyisocyanate monomer to obtain a polymer with uniform particle size distribution, its hydroxyl value (based on solid content) is 100-150 mgKOH / g, and the pH value is between 100 and 150 mgKOH / g. 6.5 to 7.8, the resin particle size is 30 to 60 nm, and the solid acid value is 10 to 20 mgKOH / g.

[0094] The water-based amino resin is commercially available Cymel 303 resin.

[0095] The pigment is titanium dioxide CR-97 resin-free color paste, which does not...

Embodiment 2

[0108] A high-solid three-coat-one-bake topcoat for automobiles based on waterborne acrylic polyurethane, consisting of the following components according to the corresponding mass percentages:

[0109]

[0110] The resin in the water-based acrylic polyurethane emulsion is water-based acrylic polyurethane emulsion A and allnex China's DAOTAN VTW 6462 / 36WA, and the mass ratio of the two is 2 / 1. Wherein, the hydroxyl value (based on solid content) of the aqueous acrylic polyurethane emulsion A is 20-50 mgKOH / g, and the pH value is 6.5-9.0. This resin is co-polymerized by acrylic polymer and urethane polymer to form an interpenetrating network structure of acrylic and urethane. The particle diameter of the dispersion particles is 60-150 nm, and the acid value of the solid content is 10-20 mgKOH / g.

[0111] Described waterborne polyurethane resin is waterborne polyurethane A and The mixture of U XP 2755 resin, the mass ratio of the two is 8:7. Among them, the hydroxyl value...

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Abstract

The invention discloses an automobile high-solid three-coating one-baking finish paint based on waterborne acrylic polyurethane, the finish paint is a single-component paint, the finish paint comprises the following components by mass: 10-35 parts of a waterborne acrylic polyurethane emulsion; 10 to 30 parts of waterborne polyurethane; 10 to 20 parts of water-based amino resin; 0.1 to 35 parts of pigment; 5-15 parts of a film forming solvent; 0.3 to 2.5 parts of a rheological additive; and 5-20 parts of water. The finish paint has the advantages of high solid content, low VOC (volatile organic compound) emission, excellent appearance and excellent mechanical properties, especially stone impact resistance.

Description

technical field [0001] The present invention relates to the field of coatings. More specifically, it relates to a high-solid three-coat-one-bake topcoat for automobiles based on waterborne acrylic polyurethane. Background technique [0002] Water-based automotive coatings are multi-component materials with water-emulsifiable, water-dispersible and water-soluble polymers as film-forming substances, water as the main dispersion medium, and organic solvents as co-solvents. As a product system that complies with the government's low volatile organic compound (low VOC) laws and regulations for coatings, and at the same time keeps up with the green and environmental protection trend favored by the public, water-based automotive coatings have been accepted by major auto OEMs in China since 2009. Active use and vigorous promotion. [0003] In the traditional water-based three-coat two-bake automotive coating system, the film thickness of the middle-coat layer is in the range of 30...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D133/00C09D161/20C09D175/04C09D7/47
CPCC09D175/06C09D7/47C08L2205/04C08L2205/035C08L2205/02C08L33/00C08L61/20C08L75/04C08K3/346
Inventor 高欣周常明黄志新周仲一邱子文
Owner NIPPON PAINT CHINA
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