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Water-based stone-crash-resistant blocked polyisocyanate curing agent as well as preparation method thereof and water-based coating

A polyisocyanate, isocyanate trimerization technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as environmental pollution, increase production costs, etc., and achieve improved stone chip resistance, low VOC emissions, and simple synthesis process. Effect

Inactive Publication Date: 2019-04-12
湖南湘江关西涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention solves the technical problem that my country's automotive intermediate paint is still mainly solvent-based, and the solvent-based intermediate paint contains a large amount of volatile organic compounds (VOC), which pollutes the environment very seriously. Ionized water is used as a solvent, and the toxic and harmful substances contained in it are significantly reduced, but the thickness of the paint film reaches more than 80 μm, which greatly increases the production cost

Method used

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  • Water-based stone-crash-resistant blocked polyisocyanate curing agent as well as preparation method thereof and water-based coating
  • Water-based stone-crash-resistant blocked polyisocyanate curing agent as well as preparation method thereof and water-based coating
  • Water-based stone-crash-resistant blocked polyisocyanate curing agent as well as preparation method thereof and water-based coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Put the hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG300) in a four-neck round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 750mmHg, temperature is 99°C, time 4h), the endpoint controls the water content of the hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG300) to 0.07%, and cools to 40°C.

[0057] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottom flask. Under stirring, add ethyl acetate and HDI trimer polyisocyanate, and blow in nitrogen at the same time, and disperse for 15 minutes. Then the temperature was raised to 95°C, the blowing of nitrogen gas was stopped, and the reaction was carried out for 2 hours to obtain a urethane prepolymer.

[0058] (3) Alkali metal salts of alcohols (potassium tert-butoxide) and active methylene blocking agents (ethyl acetoaceta...

Embodiment 2

[0062] (1) Put the hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG600) in a four-neck round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 760mmHg, temperature is 105°C, time 3h), the water content of the endpoint control hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG600) is 0.05%, and cooled to 40°C.

[0063] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottom flask. Under stirring, add ethyl acetate and IPDI trimer polyisocyanate, and blow in nitrogen at the same time, and disperse for 15 minutes. Then the temperature was raised to 95° C., the blowing of nitrogen gas was stopped, and the reaction was carried out for 1.5 hours to obtain a urethane prepolymer.

[0064] (3) Alkali metal salts of alcohols (sodium methoxide) and active methylene blocking agents (dimethyl malonate and...

Embodiment 3

[0068] (1) Put the hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG1000) in a four-necked round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 755mmHg, temperature is 100°C, time 3.5h), the water content of the end-point control hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG1000) is 0.06%, and cooled to 40°C.

[0069] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottom flask. Under stirring, add ethyl acetate and HDI trimer polyisocyanate, and blow in nitrogen at the same time, and disperse for 15 minutes. Then the temperature was raised to 95°C, the blowing of nitrogen gas was stopped, and the reaction was carried out for 2.5 hours to obtain a urethane prepolymer.

[0070] (3) Pre-disperse alkali metal salts of alcohols (sodium methoxide in methanol) and active methylene blocking ...

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Abstract

The invention provides a water-based stone-crash-resistant blocked polyisocyanate curing agent as well as a preparation method thereof and a water-based coating. The water-based stone-crash-resistantblocked polyisocyanate curing agent comprises the following raw materials: a polyisocyanate compound, a hydrophilic chain alcohol, a reactive methylene-based sealing agent, a cosolvent, an alkali metal salt of an alcohol and a neutralizing agent, wherein a molar amount of NCO in the polyisocyanate compound is greater than a molar amount of total active hydrogen. The invention also provides the preparation method of the water-based stone-crash-resistant blocked polyisocyanate curing agent and the water-based coating. According to the curing agent provided by the invention, a cross-linking density of a coating film can be improved, and therefore the stone crash resistance of the coating in automobiles under the low-film-thickness conditions can be improved.

Description

technical field [0001] The invention relates to an anti-stone chip polyisocyanate curing agent, in particular to a water-based anti-stone chip blocking polyisocyanate curing agent, a preparation method thereof, and a water-based coating. Background technique [0002] With the advancement of science and technology and the development of basic transportation facilities, cars are becoming more and more popular, and road conditions are becoming more and more complex. This brings great convenience to the public, but also puts forward higher requirements for the surface coating of cars. As an important means of outdoor transportation, automobiles may encounter various types of sand and gravel impacts when running at high speeds. Therefore, it is necessary to improve the stone impact resistance of automotive coatings to reduce the damage caused by sand and gravel impacts on automotive coatings, thereby protecting vehicles. [0003] At present, in the traditional solvent-based coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/79C08G18/48C08G18/32C09D175/06C09D175/04C09D161/32C09D161/20C09D7/61
CPCC08G18/283C08G18/2835C08G18/792C08G18/831C08K2003/2241C08L2205/02C08L2205/025C08L2205/035C09D7/61C09D175/04C09D175/06C08L75/04C08L61/32C08L61/20C08K13/02C08K3/22C08K3/04C08K3/34C08L75/06
Inventor 喻佳杨鹏飞张杰胡启明黄鹂韩祥辉
Owner 湖南湘江关西涂料有限公司
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