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Preparation method for high-hardness waterborne polyurethane dispersion

A water-based polyurethane and high hardness technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult dispersion of inorganic materials, slow drying speed, low hardness of paint film, etc., achieve excellent adhesion, improve drying speed, high gloss effect

Active Publication Date: 2014-12-24
江苏日出化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a high-hardness water-based polyurethane dispersion, which can effectively solve the problem of low hardness and easy scratching of the water-based polyurethane dispersion paint film without affecting the water resistance of the paint film. , The problem of slow drying speed
[0004] Another object of the present invention is to solve the problem that inorganic materials are difficult to disperse into water-based resins in the production process of coatings, and improve the storage stability of coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add polyester polyol with a molecular weight of 2000 into a four-necked flask, dehydrate for 2 hours at a temperature of 120°C and a vacuum of 0.02MPa, and cool down to 60°C for use. Add toluene diisocyanate (TDI) and polyester polyol to a four-neck flask for dehydration at a weight ratio of 1:3, protect it with nitrogen, react at 70°C for 2 hours, and add it at a mass ratio of 1: 0.2 dimethylol butyric acid, 1,4 butanediol accounting for 4% of the dispersion mass fraction and 0.05% of the dispersion mass fraction of dibutyltin dilaurate, then reacted at 80°C for 4 hours; cooled to At 60°C, add acetone accounting for 20% of the mass fraction of the dispersion to reduce the viscosity of the system and react for 1 hour. Continue to cool down to 30°C, add KH550 accounting for 1% of the mass fraction of the dispersion, react for 20 minutes, and quickly add triethylamine with a substance ratio of 1:1 to dimethylolbutyric acid under stirring at 500rpm, and then Stirring spee...

Embodiment 2

[0030] Put the sulfonated polyester polyol with a molecular weight of 2000 into a four-necked flask, dehydrate for 2 hours under the conditions of a temperature of 120°C and a vacuum of 0.02MPa, and cool down to 60°C for use. Add diphenylmethane diisocyanate (MDI) and polyester polyol with a molecular weight of 2000 to a four-neck flask for dehydration at a weight ratio of 1:4, protect with nitrogen, react at 70°C for 1 hour, cool down to 60°C and add sulfuric acid The polyester polyol mass ratio is 1:0.1 dimethylol butyric acid, adding diethylene glycol that accounts for 2% of the dispersion mass fraction and 0.02% dibutyltin dilaurate accounting for the dispersion mass fraction, and then React at 80°C for 4 hours; add acetone accounting for 45% of the dispersion mass fraction to react for 30 minutes, cool down to 30°C, add 2.5% of the dispersion mass fraction silane coupling agent KH560, and react for 30 minutes at a stirring speed at 1300rpm, quickly add triethylamine with ...

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Abstract

The invention discloses a preparation method for high-hardness waterborne polyurethane dispersion. An inorganic nano material and waterborne polyurethane are grafted through an in-situ polymerization method, so that the hybridization reaction of inorganic materials and the organic materials is realized and complementary advantages are realized. The preparation method comprises the following operation steps: adding polyisocyanate, macromolecule polyol, a catalyst, a chain extender and a silane coupling agent according to certain weight ratio in a flask for reacting to obtain a polyurethane prepolymer; after the reaction is ended, sequentially adding a neutralizer, inorganic nano material dispersion liquid and deionized water under the condition of low-temperature and high-speed stirring; finally, heating under the vacuum condition for removing the solvent to obtain the high-hardness waterborne polyurethane dispersion. Compared with the traditional inorganic and organic blending process, the preparation method has the characteristics that products prepared through the preparation method have the advantages of good stability, excellent water resistance, long-time aging resistance, excellent and high adhesion, high drying speed, high hardness, good fullness, higher light transmittance and the like, and are wide in application range.

Description

technical field [0001] The invention belongs to the technical field of emulsions for water-based industrial paints, and in particular relates to a preparation method of a high-hardness water-based polyurethane dispersion. Background technique [0002] Since the early 1990s, developed countries in the world have started a "green revolution", driving the paint industry to make great strides towards "green" products. Since the beginning of the 21st century, with the further improvement of environmental regulations, the research on water-based coatings with low VOC emissions for the purpose of reducing the load on the earth is increasingly becoming the focus of research and development. Traditional oil-based industrial paints emit a large amount of organic matter, which directly affects people's health on the one hand; on the other hand, it will chemically react with other chemicals in the air to form PM2.5, causing air pollution. Every year, solvent-based paints in The PM2.5 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/50C08G18/46C08G18/32C08G18/34C08G18/38C08G18/12C08K3/36C08K3/22C08K3/26C09D175/06C09D175/08
CPCC08G18/12C08G18/3203C08G18/3206C08G18/348C08G18/42C08G18/4676C08G18/6633C08G18/664C08G18/6659C08G18/7614C08G18/7671C08K3/22C08K3/36C08K2003/2206C08K2201/011C09D175/06C08G18/3228C08G18/3234
Inventor 卢小松黄道明王海泉
Owner 江苏日出化工有限公司
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