One-component water-based solid color paint for car and preparation process of the one-component water-based solid color paint

A one-component, water-based technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the physical and mechanical properties of plain paints, water resistance, chemical resistance and weather resistance defects, poor compatibility, and factors affecting Solve the problem of equal color of the paint, achieve the effect of excellent physical and mechanical properties, excellent storage stability, and simple preparation process

Active Publication Date: 2015-05-06
GUANGDONG YATU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there have been many reports on water-based plain paints for automobiles at home and abroad, but most of them have three problems: ①Water-based plain paints using acrylic emulsion as the main resin have poor storage stability, and the color development of acrylic emulsions to colorants is poor , and the blue light of acrylic emulsion often affects the hue of plain paint
②Water-based plain paint using polyurethane water dispersion as the main resin, the compatibility of the polyurethane water dispersion used with various resins, colorants and additives is not ideal, so the prepared plain paint has poor stability ; ③ there are certain defects in the physical and mechanical properties, water resistance, chemical resistance and weather resistance of the plain paint prepared by general polyurethane water dispersion

Method used

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  • One-component water-based solid color paint for car and preparation process of the one-component water-based solid color paint
  • One-component water-based solid color paint for car and preparation process of the one-component water-based solid color paint
  • One-component water-based solid color paint for car and preparation process of the one-component water-based solid color paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0032] Example A Synthesis of prepolymer monomers

[0033] Add equimolar amounts of glycidyl tert-carbonate and (dimethylol butyric acid and / or dimethylol propionic acid) in a three-necked flask equipped with a stirrer, an oil bath, and a thermometer. At different temperatures, the reactions are different. Time, obtain the prepolymer monomer-dimethylol tertiary carbonate. Among them, the epoxy equivalent of glycidyl tert-carbonate is 240g / mol, and the viscosity at 25°C is 80cps; the original acid value of dimethylol butyric acid is 376mgKOH / g, and the hydroxyl value is 758mgKOH / g; The original acid value of propionic acid is 416 mgKOH / g, and the hydroxyl value is 825 mgKOH / g. The list of each embodiment in the embodiment group A is shown in Table 1.

[0034] Table 1 List of Example A

[0035]

[0036] Note: The viscosity of the intermediate is measured at room temperature 25°C, using Brookfield DV-II rotational viscometer, No. 3 spindle, 5 revolutions / min.

[0037] By c...

Embodiment B

[0038] Example B: Synthesis of Anionic Polyurethane Aqueous Dispersion (PUD)

[0039] The synthesis of the anionic polyurethane aqueous dispersion of the present invention will be described below in conjunction with preferred examples. The dimethylol tertiary carbonate in the formula can be synthesized by oneself or purchased, preferably satisfying the acid value≤7mgKOH / g. The dimethylol tertiary carbonate synthesized in preferred embodiment A2 in the following examples. To illustrate here: this is only an illustration, and the dimethylol tertiary carbonate synthesized by other routes in the prior art can also realize the present invention.

Embodiment B1

[0041] Add polycarbonate diol and polyester diol into the reaction kettle, heat up to 110-115°C, vacuumize for 0.5h to remove moisture; then cool down to 50-55°C, add the prepolymer monomer synthesized in Example A2, Chain-extending monomers, cross-linking monomers, diisocyanate monomers, catalysts and co-solvents, wherein the molar ratio of primary hydroxyl groups carried by each component monomer to isocyanate is 1.3:1; the temperature is raised to 65-70 °C for 1 hour, then raised to 85°C-90°C for reaction, and stopped the reaction when the isocyanate group value in the system was 0 to obtain a polyurethane solution.

[0042] Deionized water is added into the polyurethane solution for emulsification to obtain the anionic polyurethane aqueous dispersion.

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Abstract

The invention discloses a one-component water-based solid color paint for a car and a preparation process of the one-component water-based solid color paint. The water-based solid color paint consists of the following components by weight percent: 50 to 70 percent of anion-type polyurethane aqueous dispersion, 20 to 45 percent of mill base, 0.1 to 10 percent of base material wetting agent, 0.2 to 1 percent of defoaming agent and 0.2 to 1 percent of thickening agent. The one-component water-based solid color paint for the car, which is prepared by mixing the anion-type polyurethane aqueous dispersion with corresponding additives, is not only high in drying speed, but also excellent in storage stability and excellent in physical and mechanical properties, water resistance, chemical resistance and weather resistance, the content of VOC of the water-based solid color paint is less than or equal to 420g / L, and the water-based solid color paint belongs to an environment-friendly product. The mono-component water-based solid color paint for the car is simple in preparation process and convenient for quality control.

Description

technical field [0001] The invention relates to a one-component water-based plain paint for automobiles and a preparation process thereof. Background technique [0002] At present, my country's automotive coatings are still mainly solvent-based, and a large number of volatile organic compounds (VOCs) have caused serious pollution to the ecological environment during the coating process, and have also brought great harm to human health. With the improvement of people's awareness of environmental protection, governments of various countries have introduced relevant regulations to limit the emission of VOCs. In order to adapt to the development of the times, automotive coatings are changing to an environment-friendly direction. Environmentally friendly coatings include water-based coatings, powder coatings, UV-curable coatings and high-solid coatings, and water-based coatings are the fastest growing category. [0003] Automotive coatings are mainly divided into primers, interm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/12
CPCC08G18/42C08G18/44C08G18/6644C09D7/40C09D175/06
Inventor 张育波阮伟明李耀昇王炼石秦中海李耀明冯兆华
Owner GUANGDONG YATU CHEM
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