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Preparation and application of waterborne polyurethane emulsion

A water-based polyurethane and emulsion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of restricting the production and market application of water-based polyurethane coatings, unfavorable large-scale commercial promotion and application, poor water resistance and chemical resistance, etc. , to achieve the effect of simple preparation method, low cost and good stability

Inactive Publication Date: 2020-01-10
宜兴市华夏化工材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waterborne polyurethane coatings with excellent safety performance are more and more recognized by consumers, but the existing waterborne polyurethane coatings often use HMDI and PCDL alone, which have poor water resistance and chemical resistance, high production costs, and are not conducive to large-scale commercial use. The popularization and application of water-based polyurethane coatings have seriously restricted the production and market application of waterborne polyurethane coatings.

Method used

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  • Preparation and application of waterborne polyurethane emulsion
  • Preparation and application of waterborne polyurethane emulsion
  • Preparation and application of waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] HMDI and IPDI are mixed in a molar ratio of 2:1 to form a mixture A, PCDL and PCL are mixed in a molar ratio of 2:1 to form a mixture B, and mixture A and mixture B are mixed to form a reaction solution, and -NCO and -OH in the reaction solution The molar ratio is 5:1; add 5.5wt% DMPA to the reaction solution, react at 85°C for 2.5 hours; adjust the temperature to 65°C, add 35wt% acetone to adjust the viscosity, add 2.5wt% TMP, and react for 5 hoursn When -NCO reaches the theoretical value of 1.8%, add DMEA to neutralize -COOH in DMPA to form a waterborne polyurethane prepolymer; the molar ratio of DMEA to DMPA is 1.13:1;

[0028] The prepared water-based polyurethane prepolymer was added to the deionized water accounting for 65wt% of the total mass of the system under 3000 rpm high-speed stirring state and stirred for 0.5 hours, and 1.9wt% ethylenediamine was added at room temperature and stirred for 3 hours to obtain a water-based polyurethane dispersion;

[0029] The...

Embodiment 2

[0038] Mix HMDI and IPDI at a molar ratio of 1:0.01 to form mixture A, mix PCDL and PCL at a molar ratio of 1:1 to form mixture B, mix mixture A and mixture B to form a reaction solution, and -NCO and -OH in the reaction solution The molar ratio is 5:1; add 4.5wt% DMPA to the reaction solution, react at 95°C for 1.5 hours, adjust the temperature to 70°C, add 20wt% acetone and 0.5wt% TMP, react for 5 hours n-NCO When the theoretical value reaches 1.9%, add DMEA to neutralize -COOH in DMPA to form a waterborne polyurethane prepolymer; the molar ratio of DMEA to DMPA is 1.1:1;

[0039] The prepared water-based polyurethane prepolymer was added to the deionized water accounting for 75wt% of the total mass of the system under 1500 rpm high-speed stirring state and stirred for 0.5 hours, and 2.5wt% ethylenediamine was added at room temperature and stirred for 1.5 hours to obtain a water-based polyurethane dispersion;

[0040] The acetone in the aqueous polyurethane dispersion was re...

Embodiment 3

[0042]Mix HMDI and IPDI at a molar ratio of 2:1 to form mixture A, PCDL and PCL are mixed at a molar ratio of 1:0.01 to form mixture B, mix mixture A and mixture B to form a reaction solution, and -NCO and -OH in the reaction solution The molar ratio is 5:1; add 6.5wt% of DMPA to the reaction solution, react at 65°C for 4 hours; keep the temperature at 65°C and add acetone and TMP, acetone and TMP account for 40wt% and 3.5wt of the total mass respectively %, when n-NCO reaches the theoretical value (1.8-2.0%) after 4.5 hours of reaction, add DMEA to neutralize -COOH in DMPA to form a waterborne polyurethane prepolymer; the molar ratio of DMEA to DMPA is 1.15:1;

[0043] The prepared water-based polyurethane prepolymer was added to the deionized water accounting for 70wt% of the total mass of the system under 3500 rpm high-speed stirring state and stirred for 1 hour, and 1.4% ethylenediamine was added at room temperature and stirred for 3.5 hours to obtain a water-based polyuret...

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Abstract

The invention belongs to the field of polymer functional materials and particularly relates to a preparation and application of waterborne polyurethane emulsion. An acetone method is adopted to enablemixed isocyanate to react with mixed polyester, a hydrophilic monomer, namely dimethylolpropionic acid (DMPA) is introduced, and under the combined action of a chain extender, namely trimethylolpropane (TMP), the waterborne polyurethane emulsion released by non-volatile organic compounds is prepared. Through various characterization means, it is verified that the waterborne polyurethane emulsionhas excellent stability and hydrophobic performance, has the characteristics of low production cost and excellent performance, and can be subjected to large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the field of polymer functional materials, and in particular relates to a preparation method and application of an aqueous polyurethane emulsion. Background technique [0002] Organic solvents in wood coatings volatilize into the air, which not only affects the environment, but also causes harm to humans and animals. Traditional polyurethane coatings contain most volatile organic solvents such as toluene and xylene, which are usually released into the air when the coatings are drying and curing, posing a threat to human health. In recent years, the Chinese government has imposed strict restrictions on the release of volatile organic compounds (VOCs) from coatings. Waterborne polyurethane coatings with excellent safety performance are more and more recognized by consumers, but the existing waterborne polyurethane coatings often use HMDI and PCDL alone, which have poor water resistance and chemical resistance, high production co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/12C08G18/32C08G18/34C08G18/42C08G18/44C09D175/06
CPCC08G18/12C08G18/3206C08G18/3271C08G18/348C08G18/4277C08G18/44C08G18/6692C09D175/06C08G18/3228
Inventor 史星照孟令巧张瑞龙周志平燕龙梁钊朋聂仪晶
Owner 宜兴市华夏化工材料有限公司
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