Preparation method and application of waterborne automotive coating material with self-repairing function

A moisture and reaction technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of destroying the high decoration and gloss of the surface, shortening the service life of the coating film, and reducing the mechanical strength of the coating film, so as to improve the toughness and mechanical strength of the coating. Performance, extended service life, and improved leveling

Active Publication Date: 2018-05-25
QINGYUAN HAOYU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But no matter how good the quality of the car coating is, in the process of use, the coating is disturbed by external factors, such as mud, stone splashes and mechanical rubbing, adhesions, tree branches, hard scratches and abrasions, etc. Aspects of damage will inevitably produce microcracks and local damage. No abnormalities can be seen on the surface, but the mechanical strength of the coating film has decreased and the integrity has been severely damaged. Due to the limitations of manual repair, if the damaged part cannot be repaired in time , which will not only reduce the performance of the coating film, but also destroy the high decoration and gloss of the surface, greatly shorten the service life of the coating film, and sometimes bring disastrous consequences

Method used

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  • Preparation method and application of waterborne automotive coating material with self-repairing function
  • Preparation method and application of waterborne automotive coating material with self-repairing function
  • Preparation method and application of waterborne automotive coating material with self-repairing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a reactor equipped with a stirring paddle, a thermometer and a condenser, add 70 parts by weight of polyethylene glycol, 9 parts by weight of N-methylpyrrolidone, and 0.3 parts by weight of nano-silicon dioxide, and raise the temperature to 80°C under nitrogen protection. After maintaining the high-speed dispersion state for 0.5h, add 4.5 parts by weight of dimethylolbutyric acid, cool down to 65°C, add 0.03 parts by weight of dibutyltin dilaurate and 20 parts by weight of isophorone diisocyanate, keep the temperature at 80°C, and continue React for 3.5 hours, cool to 55° C., add 3 parts by weight of triethylamine for neutralization, and react for 25 minutes until the pH value is 8-9 to obtain a nano-modified polyurethane aqueous dispersion prepolymer.

[0023] Keep the prepolymer at 70°C, vigorously stir and slowly add it to deionized water at 25°C, and finally add an appropriate amount of ethylenediamine, react for 2 hours, and then discharge, to obtain a silica nan...

Embodiment 2

[0025] Embodiment 2 performance indicator test method is the same as embodiment 1

[0026] In stirring paddle, thermometer, condenser reactor, add 60 parts by weight polyalcohol (polyethylene glycol, polypropylene glycol or polycarbonate glycol, polybutylene adipate glycol), 5 Parts by weight of N-methylpyrrolidone and 0.1 parts by weight of nano-silica, under the protection of nitrogen, the temperature was raised to 80°C, and after maintaining a high-speed dispersion state for 0.5h, 3 parts by weight of dimethylolbutyric acid was added, and the temperature was lowered to 65°C. Add 0.02 parts by weight of organic tin catalyst (dibutyltin dilaurate, stannous octoate) and 15 parts by weight of polyisocyanate (isophorone diisocyanate or diphenylmethane diisocyanate or hexamethylene diisocyanate), keep the temperature at 80 ℃, continue to react for 3 minutes, cool to 55℃, add 2 parts by weight of neutralizing agent (ammonia or triethylamine or dimethylethanolamine) for neutralizat...

Embodiment 3

[0028] Embodiment 3 performance indicator test method is the same as embodiment 1

[0029] In stirring paddle, thermometer, condenser reactor are housed, add 80 parts by weight polyalcohols (polyethylene glycol, polypropylene glycol or polycarbonate glycol, polybutylene adipate glycol), 10 Parts by weight of N-methylpyrrolidone and 0.5 parts by weight of nano-silica, under the protection of nitrogen, the temperature was raised to 80°C, and after maintaining a high-speed dispersion state for 0.5h, 5 parts by weight of dimethylolbutyric acid was added, and the temperature was lowered to 65°C. Add 0.05 parts by weight of organic tin catalyst (dibutyltin dilaurate, stannous octoate) and 25 parts by weight of polyisocyanate (isophorone diisocyanate or diphenylmethane diisocyanate or hexamethylene diisocyanate), keep the temperature at 80 ℃, continue to react for 4 hours, cool to 55 ℃, add 4 parts by weight of neutralizing agent (ammonia or triethylamine or dimethylethanolamine) for...

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Abstract

The invention relates to a preparation method and application of a waterborne automotive coating material with a self-repairing function, and belongs to the series of waterborne automotive coating materials. The invention discloses a preparation method of a silica nano modified polyurethane aqueous dispersion. According to the preparation method, the special physicochemical performance of a nano material and the advantages of polyurethanes are sufficiently combined; the waterborne automotive coating material with the self-repairing function is researched and developed; the microdamage of a surface coating of a car body, particularly the damage which cannot be easily detected in an interior, is enabled to realize self-repairing at a broken position of the coating by means of the coating material in the condition of not using an additional repairing material; the waterborne automotive coating material has significant value. Meanwhile, a nano particle and a framework material interact; aformed paint film is high in luster, good in fullness and excellent in mechanical performance; the comprehensive performance is greatly improved, and the silica nano modified polyurethane aqueous dispersion is environment-friendly and energy-saving, is high in operability, is convenient to popularize and apply, and has a wide market prospect.

Description

technical field [0001] The present invention relates to a kind of preparation method and application of self-healing type waterborne automobile coating, relate in particular to a kind of preparation method of silicon dioxide nano-modified polyurethane aqueous dispersion. Background technique [0002] With the development of industrial economy and urbanization, my country's automobile production and sales have ranked first in the world for seven consecutive years, becoming the world's largest automobile production and sales country. The rapid development of the automobile industry has an obvious pulling effect on the automotive coatings market, making automotive coatings the fastest growing type of coating and the type of coating with the highest performance requirements. Therefore, automotive coatings often represent the highest level of development of the contemporary coatings industry. [0003] Automotive surface coatings play a major decorative and protective role in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/06C09D7/61C08G18/08C08G18/12C08G18/34C08G18/42C08G18/44C08G18/48C08G18/66
CPCC09D175/06C09D175/08C08G18/0823C08G18/12C08G18/348C08G18/4238C08G18/44C08G18/4825C08G18/6659C08G18/6692C08K2201/011C08K3/36C08G18/3228
Inventor 郭逍遥汤汉良赵果李树伟陈之善
Owner QINGYUAN HAOYU CHEM TECH
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