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Method of 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: 2019-03-12
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

[0006] 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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  • Method of improving water resistance or solvent resistance of waterborne polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 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.

[0048] 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

[0053] 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.

[0054] 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.

[0055] 3) Cool the reaction system to 25°C, add 1.04 parts...

Embodiment 3

[0059] 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.

[0060] 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.

[0061] 3) Cool the reaction system to 25°C, add 1.39 ...

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Abstract

Disclosed is a method of improving water resistance or solvent resistance of waterborne polyurethane. The method herein comprises subjecting cyclic carbonates and amine compounds to aminolysis to prepare an alcohol amine chain extender; pre-polymerizing polymer polyols, isocyanate compounds and a carboxyl-containing hydrophilic agent, then adding 1,4-butanediol and a solvent for reaction, and adding a salt-forming agent into the reaction product for reaction to obtain a prepolymer; emulsifying the prepolymer in water, adding the prepared chain extender for chain extension to obtain a waterproof or solvent-resistant polyurethane emulsion, pouring the waterproof or solvent-resistant emulsion into a mold for drying at normal temperature, and evaporating water to obtain waterborne polyurethane. The method herein has the advantages of being simple to perform, low in cost and good in waterproofness 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. technical background [0002] 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 pollutio...

Claims

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Application Information

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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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