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A method for improving water resistance or solvent resistance of waterborne polyurethane

A technology of water-based polyurethane and solvent resistance, which is applied in the field of improving the water resistance or solvent resistance of water-based polyurethane, which can solve the problems of limited water resistance, complicated operation, high cost, etc., and achieves improved water/solvent resistance, simple preparation process, and mechanical properties Good results

Active Publication Date: 2021-06-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned background technology is more complicated to operate when solving the problem of poor water resistance of water-based polyurethane, which increases the difficulty of production; and when preparing water-based polyurethane, more raw materials are required and the cost is higher; in addition, some modification methods are effective for improving water resistance. Limited, and less water resistant

Method used

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  • A method for improving water resistance or solvent resistance of waterborne polyurethane
  • A method for improving water resistance or solvent resistance of waterborne polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 1) Add 100 parts by mass of 1,4-butanediglycidyl ether and 15 parts by mass of the catalyst basic exchange resin D296 into the autoclave, raise the temperature to 140°C and pass in CO 2 , the pressure was kept at 2MPa, and the catalyst was filtered after reacting for 30h to obtain a cyclocarbonate compound. Then weigh 100 parts of the synthesized cyclic carbonate compound, add 82.8 parts of ethylenediamine and heat it to 100°C for 6 hours of heat preservation reaction. After the reaction, vacuum and vacuum distillation at 90°C for 5 hours to remove excess ethylenediamine to obtain alcohol amine expanded chain agent.

[0049] 2) the poly(ethylene adipate propylene glycol) polyol (M n =2000) into the reactor, heated up to 140°C, vacuum dehydrated for 2 hours; then cooled to 50°C, added 1.5 parts of 2,2-hydroxymethyl propionic acid and 4.61 parts of isophorone diisocyanate compound, and then heated React at 75°C for 2 hours; after the reaction, cool down to 50°C and add ...

Embodiment 2

[0054] 1) Add 100 parts by mass of diethylene glycol diglycidyl ether and 5 parts by mass of the catalyst basic exchange resin D296 into the autoclave, heat up to 140°C and feed CO 2 , the pressure was kept at 4MPa, and the catalyst was filtered after reacting for 45h to obtain a cyclocarbonate compound. Then weigh 100 parts of the synthesized cyclic carbonate compound, add 120.1 parts of hexamethylenediamine and heat it to 70°C for 10 hours of heat preservation reaction. chain agent.

[0055] 2) the polycarbonate diol (M n =2000) into the reactor, heated up to 100°C, vacuum dehydrated for 4h; then cooled to 50°C, added 0.75 parts of 2,2-hydroxymethyl propionic acid and 3.04 parts of hexamethylene diisocyanate compound, and then heated React at 90°C for 2 hours; after the reaction, cool down to 60°C and add 0.24 parts of 1,4-butanediol and 10.52 parts of solvent N-methylpyrrolidone for reflux reaction for 2 hours.

[0056] 3) Cool the reaction system to 25°C, add 1.04 parts...

Embodiment 3

[0060] 1) Add 100 parts by mass of ethylene glycol diglycidyl ether and 15 parts by mass of the catalyst basic exchange resin D296 into the autoclave, heat up to 130°C and feed CO 2 , the pressure was kept at 2MPa, and the catalyst was filtered after reacting for 30h to obtain a cyclocarbonate compound. Then weigh 100 parts of the synthesized cyclic carbonate compound, add 52.4 parts of hexamethylenediamine and heat it to 70°C for 10 hours of heat preservation reaction. chain agent.

[0061] 2) the polycarbonate diol (M n =1000) into the reactor, heated up to 120°C, vacuum dehydration for 3h; after cooling down to 50°C, add 1 part of 2,2-hydroxymethylpropionic acid, 2.26 parts of diphenylmethane diisocyanate and 2.01 parts of isocyanate For phorone diisocyanate, heat up to 90°C for 2 hours; after the reaction, cool down to 60°C and add 0.3 parts of 1,4-butanediol and 6.70 parts of solvent acetone to reflux for 2 hours.

[0062] 3) Cool the reaction system to 25°C, add 1.39 ...

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Abstract

A method for preparing water-resistant or solvent-resistant water-based polyurethane is to carry out aminolysis of cyclic carbonate and amine compounds to produce alcohol amine chain extenders; Adding 1,4-butanediol and a solvent to continue the reaction, adding a salt-forming agent to the above reaction product after the reaction to obtain a prepolymer; emulsifying the prepolymer with water, adding the prepared chain extender for post-chain extension, and obtaining Water-resistant or solvent-resistant water-based polyurethane emulsion, poured into a mold to dry at room temperature, and evaporate the solvent to make water-based polyurethane. The invention has the advantages of simple operation, low cost, good water resistance and solvent resistance.

Description

technical field [0001] The invention relates to a method for improving water resistance or solvent resistance of water-based polyurethane, in particular to a method for improving the water resistance or solvent resistance of water-based polyurethane by using a water-based polyurethane chain extender prepared from carbon dioxide. [0002] technical background [0003] As a common polymer material, polyurethane has the characteristics of high strength, good elasticity, and excellent wear resistance. The production process not only consumes a large amount of solvent, but also causes harm to the environment and personal safety. With the enhancement of people's awareness of environmental protection, the use of solvent-based polyurethane is more and more restricted; the corresponding water-based polyurethane products use water as a solvent in the synthesis process to reduce solvent volatilization and pollute the environment, which has the advantages of environmental protection and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/08C08G18/12C08G18/34C08G18/40C08G18/42C08G18/44C08G18/48C08G18/32C08G18/38
CPCC08G18/0823C08G18/12C08G18/348C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4833C08G18/4854C08G18/6655C08G18/6692C08G18/3206C08G18/3271C08G18/3821
Inventor 王军威李晓云亢茂青赵雨花冯月兰李其峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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