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Preparation method of acrylate-modified polyurethane aqueous dispersion body and application thereof

A polyurethane water-dispersed, acrylate technology, used in metal-free paints, coatings, etc., can solve the problems of water resistance, wear resistance, poor mechanical properties, poor solvent resistance, hot sticking and cold brittleness, etc., to achieve transparency Good, excellent comprehensive performance indicators, the effect of reducing total emissions

Inactive Publication Date: 2018-02-23
广东华斓汽车材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of water-based polyurethane is composed of soft segments and hard segments alternately. It has outstanding performance in terms of strength, elasticity and cohesiveness, but its water resistance, abrasion resistance and mechanical properties are relatively poor; while polyacrylate aqueous dispersion has mechanical properties. High performance, good water resistance, good light and weather resistance, aging resistance, good anti-yellowing performance, etc., but its poor solvent resistance, poor flexibility, hot sticky and cold brittle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) First add 200 parts of polycarbonate diol and N-methylpyrrolidone at 80°C, add 15 parts of dimethylol propionic acid, raise the temperature to 105°C and keep it in a dispersed state for 0.5h, then cool down to 60°C, Add 0.15 parts of dibutyltin dilaurate, add 70 parts of aliphatic isophorone diisocyanate within 30 minutes, keep the temperature below 75°C, keep the reaction for 2-3 hours, cool to 55°C, add 9 parts of triethylamine for neutralization , reacted until the pH value reached 8-9; slowly added 520 parts of deionized water under dispersion conditions, kept for 30 minutes to disperse evenly, and finally added 5 parts of ethylenediamine, and kept reacting for 3 hours to obtain a polyurethane aqueous dispersion.

[0026] 2) Add 20 parts of methyl methacrylate, 8 parts of butyl acrylate, and 52 parts of deionized water to step 1. After the dispersion is uniform, the temperature is raised to 85°C, and 0.6 parts of 10% ammonium persulfate is slowly added dropwise fo...

Embodiment 2

[0028] 1) First add 180 parts of polycarbonate diol and N-methylpyrrolidone at 80°C, add 10 parts of dimethylol butyric acid, raise the temperature to 105°C and keep it in a dispersed state for 0.5h, then cool down to 60°C, Add 0.1 part of stannous octoate catalyst, add 60 parts of isophorone diisocyanate within 30 minutes, keep the temperature below 75 ° C, keep the reaction for 2-3 hours, cool to 55 ° C, add 8 parts of triethylamine for neutralization, and react to The pH value reaches 8-9; under the dispersion condition, slowly add 450 parts of deionized water, keep the dispersion uniform for 30 minutes, finally add 4 parts of ethylenediamine, keep the reaction for 2 hours, and obtain the polyurethane aqueous dispersion;

[0029] 2) Add 15 parts of methyl methacrylate, 5 parts of butyl acrylate, and 40 parts of deionized water to step 1. After the dispersion is uniform, the temperature is raised to 85°C, and 0.1 part of 10% ammonium persulfate is slowly added dropwise for 2 ...

Embodiment 3

[0031] 1) First add 230 parts of polybutylene adipate diol and N-methylpyrrolidone at 80°C, add 20 parts of dimethylol butyric acid, heat up to 105°C and keep it in a dispersed state for 0.5h, Cool down to 60°C, add 0.3 parts of stannous octoate catalyst, add 80 parts of hexamethylene diisocyanate within 30 minutes, keep the temperature below 75°C, keep the reaction for 2-3 hours, cool to 55°C, add 12 parts of dimethylethanolamine Neutralize and react until the pH value reaches 8-9; slowly add 650 parts of deionized water under dispersion conditions, keep the dispersion uniform for 30 minutes, and finally add 8 parts of ethylenediamine, keep the reaction for 4 hours, and obtain a polyurethane aqueous dispersion;

[0032] 2) Add 25 parts of methyl methacrylate, 10 parts of butyl acrylate, and 60 parts of deionized water to step 1. After the dispersion is uniform, the temperature is raised to 85°C, and 0.5 parts of potassium sulfate is slowly added dropwise. After 2 hours, keep ...

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PUM

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Abstract

The invention relates to a preparation method of an acrylate-modified polyurethane aqueous dispersion body and application thereof, and belongs to automobile coating series. The invention discloses the polyurethane aqueous dispersion body and the preparation method of the acrylate-modified polyurethane aqueous dispersion body. The acrylate-modified polyurethane aqueous dispersion body fully combines the advantages of acrylics and polyurethanes and has excellent performance on water resistance, solvent resistance, hardness, adhesion and other aspects, the appearance of paint film has metal texture, the color change performance along with angles is high, the total VOC emission can be reduced by 2 / 5, and the acrylate-modified polyurethane aqueous dispersion body is environmentally friendly, capable of saving energy, high in operability, convenient to popularize and apply and broad in market prospect.

Description

technical field [0001] The invention relates to a water-based automotive metallic flash coating, in particular to a preparation method of an acrylate-modified polyurethane aqueous dispersion. Background technique [0002] With the rapid development of the automobile industry, the amount of automotive coatings has increased sharply. However, at present, domestic automotive coatings are mainly solvent-based systems, which contain a large amount of volatile organic compounds. The pollution to the environment is becoming more and more serious. People are increasingly calling for environmentally friendly coatings. From the perspective of environmental protection and sustainable development, it is imperative to research and develop environmentally friendly coatings. Therefore, the development of high-performance water-based automotive coating materials is not only environmentally friendly, but also reduces the harm and safety hazards of harmful organic solvents to the human body d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/14C08F220/18C09D151/08C09D5/38C08G18/75C08G18/73C08G18/66C08G18/42C08G18/44C08G18/34C08G18/32
CPCC08F283/006C08G18/0823C08G18/12C08G18/348C08G18/4238C08G18/44C08G18/6659C08G18/73C08G18/755C08K2003/0812C09D5/38C09D151/08C08F220/14C08G18/3228C08L1/08C08K3/08
Inventor 郭逍遥陈之善赵果汤汉良杨惠娟李树伟刘其平
Owner 广东华斓汽车材料研究院
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