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Waterborne polyurethane dispersion and preparation method thereof

A technology of water-based polyurethane and polyurethane prepolymer, applied in the direction of coating, etc., can solve problems such as swelling of ribs, achieve the effect of improving drying speed, strengthening strength, and improving water sealing effect

Pending Publication Date: 2020-12-11
珠海展辰新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this application is to provide a water-based polyurethane dispersion and its preparation method, aiming to solve the problem of tendon expansion existing in the existing water-based wood coatings

Method used

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  • Waterborne polyurethane dispersion and preparation method thereof
  • Waterborne polyurethane dispersion and preparation method thereof
  • Waterborne polyurethane dispersion and preparation method thereof

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preparation example Construction

[0040] On the basis of the above-mentioned technical scheme, the embodiment of the present application also provides a kind of preparation method of aqueous polyurethane dispersion, comprises the following steps:

[0041] S01. According to the above-mentioned aqueous polyurethane dispersion, the raw materials for preparation are provided: diisocyanate, polypolyol, castor oil, solvent, chain extender, acrylate monomer, initiator, water, hydrophilic diol, neutralizer and auxiliary agent;

[0042] S02, mixing diisocyanate, polypolyol, castor oil, hydrophilic dibasic alcohol and a solvent to perform a first reaction to obtain a polyurethane prepolymer;

[0043] S03, mixing the polyurethane prepolymer, the acrylate monomer and the neutralizing agent to obtain a mixture;

[0044] S04, dispersing water in the mixture under high-speed stirring, then adding a chain extender and performing a second reaction to obtain an intermediate;

[0045] S05, mixing the intermediate and the initi...

Embodiment 1

[0065] Present embodiment provides a kind of aqueous polyurethane dispersion, and its preparation method comprises the following steps:

[0066](1) A 1000mL four-necked flask equipped with a stirring device and a thermometer was dehydrated and fed with nitrogen, and 46.4g of toluene diisocyanate, 60.6g of BG / AA type polyester diol with a molecular weight of 1000 after dehydration, 7.64g Castor oil, 12.73g dimethylol propionic acid, 30g DMF (polyurethane grade), start stirring, slowly raise the temperature to 60°C, heat up to 75°C for 3-4h, the NCO test value in the system is less than 6.1 of the theoretical value %;

[0067] (2) Cool down to 50°C, add 254g methyl methacrylate and stir for 30 minutes, then add 9.8g triethylamine and carry out neutralization reaction for 15 minutes to obtain the mixture; after that, transfer the mixture to the dispersion bucket, and Quickly add the prepared 640g deionized water under the high-speed stirring state with a speed greater than 1000r...

Embodiment 2

[0070] Present embodiment provides a kind of aqueous polyurethane dispersion, and its preparation method comprises the following steps:

[0071] (1) A 1000mL four-necked flask equipped with a stirring device and a thermometer was dehydrated and fed with nitrogen, and 59.2g of isophorone diisocyanate, 47.7g of dehydrated polycarbonate diol with a molecular weight of 1000, 8.56g Castor oil, 14.27g dimethylolpropionic acid, 25g PMA (polyurethane grade), start stirring, slowly raise the temperature to 70°C, heat up to 85°C for 3-4h, the NCO test value in the system is less than 5.0 of the theoretical value %;

[0072] (2) Cool down to 50°C, add 291g methyl methacrylate and 33g isobornyl methacrylate and stir for 30 minutes, then add 11.4g triethylamine and carry out neutralization reaction for 15 minutes to obtain a mixture; after that, the mixture Transfer to the dispersion bucket, and quickly add the prepared 590g of deionized water under the high-speed stirring state of greate...

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Abstract

The invention provides a waterborne polyurethane dispersion. The waterborne polyurethane dispersion is prepared from 3-10 parts of diisocyanate; 3-15 parts of a polyhydric alcohol; 0.5-5 parts of castor oil; 1-5 parts of a solvent; 0.5-5 parts of a chain extender; 10-35 parts of an acrylate monomer; 0.1-0.3 parts of an initiator; 40-65 parts of water; 0-5 parts of hydrophilic dihydric alcohol; 0-2parts of a neutralizer; and 0-0.5 parts of an auxiliary agent. During preparation, castor oil is introduced into the step of synthesizing a polyurethane prepolymer, so that the castor oil cooperateswith the polyhydric alcohol to react with diisocyanate to synthesize the polyurethane prepolymer; an acrylate monomer is added, and water is added in a high-speed stirring state to form a secondary dispersion; a chain extender is added to form a polyurethane shell layer; and an initiator is added to form a polyacrylate core so as to obtain the waterborne polyurethane dispersion. Castor oil and polyacrylate are used as modifiers, so that the permeability and the drying speed of the waterborne polyurethane dispersion are improved, a paint film has high hydrophobicity, high hardness and high sealing property after being formed, and the problem of rib expansion of waterborne wood coatings is solved.

Description

technical field [0001] The application belongs to the technical field of coatings, and in particular relates to an aqueous polyurethane dispersion and a preparation method thereof. Background technique [0002] Wooden furniture is an indispensable item in life. The painted furniture adds a lot of sense of class to it. The importance of its aesthetics is self-evident. However, the wood is loose and multi-pipe, and the water-based paint contains a lot of water. The latent heat is large and the volatilization is slow. After painting, water enters the conduit and swells when encountering wood fibers to form an arch bridge, that is, the phenomenon of bulging tendons, which seriously affects the aesthetics. With the advancement of environmental protection, the water-based coating market is getting bigger and bigger, and the problem of rib swelling in water-based one-component wood primers is particularly serious. How to solve this problem has become a difficult problem in the wate...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/14C08F220/18C08G18/76C08G18/75C08G18/66C08G18/42C08G18/36C08G18/34C08G18/32C08G18/12C08G18/44C09D151/08
CPCC08F283/008C08G18/7614C08G18/755C08G18/6662C08G18/42C08G18/36C08G18/348C08G18/12C08G18/44C09D151/08C08F220/14C08F220/1811C08G18/3228C08G18/3234
Inventor 黄焕发陈寿生
Owner 珠海展辰新材料股份有限公司
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