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Hydroxyl-containing crylic acid polyurethane aqueous dispersion body and application

A technology of acrylic polyurethane and hydroxyacrylic acid, which is applied in the direction of coating, etc., can solve the problems of product performance such as gloss, weather resistance, corrosion resistance defects, practical application limitations, immature preparation process of water-based automotive varnish, etc., and achieve construction Improved adaptability, improved scratch resistance and water resistance, reduced haze

Active Publication Date: 2010-08-04
清远明宇材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the immature preparation process of water-based automotive finish varnish, the performance of the prepared product, such as gloss, weather resistance, corrosion resistance, etc., still has defects, which limits its practical application.
And about the preparation that can realize the general-purpose water-based automobile finishing varnish of repairing in the original factory, there is no report yet

Method used

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  • Hydroxyl-containing crylic acid polyurethane aqueous dispersion body and application
  • Hydroxyl-containing crylic acid polyurethane aqueous dispersion body and application
  • Hydroxyl-containing crylic acid polyurethane aqueous dispersion body and application

Examples

Experimental program
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Effect test

Embodiment 1

[0088] The preparation embodiment of embodiment 1-product

[0089] Under nitrogen protection, with 30g of methyl methacrylate as a solvent, 120g of PPG-220 (produced by Shanghai Gaoqiao Chemical Company, number average molecular weight 2000, average hydroxyl functionality 2), 20g of hexamethylene diisocyanate, 6g Add dimethylolpropionic acid and 1g dibutyltin dilaurate into the reaction kettle, heat up to 80°C under stirring, and react for 1.5h to obtain a carboxyl-containing isocyanate-terminated polyurethane prepolymer; Add 10g of hydroxyethyl methacrylate and react at 85°C for 1 hour to obtain a polyurethane prepolymer containing carboxyl groups and terminal vinyl groups in the molecular chain; add triethylamine to the prepolymer to make the pH = 7, so that the carboxyl groups and salt formation, then add 250g distilled water under stirring to disperse the prepolymer to obtain a water-dispersible polyurethane prepolymer; add 15g butyl acrylate, 5g n-butyl methacrylate, 10g ...

Embodiment 2

[0091] Under nitrogen protection, with the methyl methacrylate of 30g as solvent, 120g PPG-220 (produced by Takahashi Chemical Industry, number average molecular weight 2000,), 25g isophorone diisocyanate, 8g dimethylol propionic acid and Add 1g of dibutyltin dilaurate into the reaction kettle, raise the temperature to 80°C under stirring, and react for 1.5h; add 10g of hydroxyethyl acrylate, and react at 85°C for 1h to obtain a carboxyl group-containing molecular chain and a terminal vinyl group. Polyurethane prepolymer; add triethylamine to make the pH = 7, so that the carboxyl group is neutralized into a salt, and then add 250g of distilled water under stirring to disperse the prepolymer; add 10g of butyl acrylate, 20g of n-butyl methacrylate, 10g Hydroxyethyl acrylate, 0.5g of dodecanethiol and 30g of distilled water were emulsified with high-speed stirring, and the temperature was raised to 85°C, and a solution consisting of 0.5g of initiator ammonium persulfate and 30g of...

Embodiment 3

[0093] Under nitrogen protection, with 30g of methyl methacrylate as a solvent, 120g of PPG-220 (produced by Takahashi Chemical Industry, number average molecular weight 2000), 25g of isophorone diisocyanate, 9g of dimethylol propionic acid and 1g of dimethicone Add butyltin dilaurate to the reaction kettle, raise the temperature to 80°C under stirring, and react for 1.5h; add 15g of hydroxypropyl acrylate, and react at 85°C for 1h to obtain a polyurethane preprepared with carboxyl group and terminal vinyl group in the molecular chain. polymer; add 10g triethylamine to make pH = 7, so that the carboxyl group is neutralized to form a salt, and then add 250g distilled water under stirring to disperse the prepolymer; add 20g butyl acrylate, 10g n-butyl methacrylate, 10g acrylic acid Hydroxyethyl ester and 20g of distilled water are emulsified with high-speed stirring, and the temperature is raised to 85°C. A solution consisting of 0.5g of initiator potassium persulfate and 40g of ...

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Abstract

The invention provides a preparation method of hydroxyl-containing crylic acid polyurethane aqueous dispersion body, comprising the following steps: (1) hydroxyl-containing terminal isocyanate group polyurethane prepolymer is obtained by reaction; (2) hydroxyl acrylic ester monomer is added in the obtained polyurethane prepolymer in the step (1) for further reaction, so as to obtain a molecular chain hydroxyl-containing terminal ethenyl containing polyurethane prepolymer; (3) neutralizer is added in the polyurethane prepolymer obtained in the step (2), the pH of the system reaches 7-8, and then distilled water is added to disperse the prepolymer, so as to obtain the dispersion-type polyurethane prepolymer; and (4) vinyl monomers and chain transfer agent are added in the step (3), and then the solution formed by radical initiators and distilled water is dropwise added, so as to obtain the hydroxyl-containing crylic acid polyurethane aqueous dispersion body by reaction; the invention further provides aqueous finish varnish for vehicle, which is formed by aqueous dispersion body and polyisocyanate curing agent.

Description

technical field [0001] The invention relates to a car finish varnish, in particular to a water-based car finish varnish prepared from a hydroxyl-containing acrylic polyurethane water dispersion and used for repairing by the original factory. Background technique [0002] Automotive varnish is the outermost layer of coating on the car. It is applied on top of the metallic flash paint and plays an important role in improving the durability, scratch resistance, and corrosion resistance of the paint film. [0003] At present, the varnish products on the market are mainly solvent-based. For example, Japan mainly uses solvent-based acrylic amino resins, while Europe and North America use both acrylic amino resins and acrylic polyurethane resins. Such products are harmful to the human body and have high VOC emissions, which are not conducive to environmental protection. [0004] In order to meet the requirements of environmental protection, the current research on automotive varni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/08C08F290/06C08G18/67C09D151/08C09D7/12
Inventor 汤汉良罗晖刘育红朱斌井新利马晓阳陈耀容司晶晶
Owner 清远明宇材料科技有限公司
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