Technology for preparing polyurethane curing agent

A polyurethane curing agent and production process technology, applied in the field of polymer materials, can solve the problems of poor product stability and consistency, poor emulsifying effect, poor water solubility, etc., and achieve the effects of stable reaction, high solid content and stable properties

Inactive Publication Date: 2018-02-09
永嘉县信诚科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the products prepared by existing water-based polyurethane curing agents generally have disadvantages such as poor water solubility, poor emulsification effect, low solid content, poor product stability and consistency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The reactant of polyurethane curing agent production technique of the present invention comprises polyethylene glycol, diisocyanate, polar non-protonated strong solvent, antioxidant, catalyst and neutralizing agent; Mainly adopt following production technique:

[0013] 1) Feed polyethylene glycol with a molecular weight of 400, put 916 parts into a 1500L stock preparation kettle, and raise the temperature to 115 0 C, vacuumize and dehydrate for 0.5 hours, open the reflux condensation valve, and feed nitrogen protection;

[0014] 2) Under medium-speed stirring, feed 230 parts of N,N-dimethylformamide, 91.6 parts of 2,2-dihydroxypropionic acid, 2 parts of catalyst and 4 parts of antioxidant into the above stock preparation kettle, stir for 30 minutes until colorless Liquid, natural cooling for standby;

[0015] 3) In the 3000L reactor, pass nitrogen protection, open the reflux valve, feed 1035 parts of toluene diisocyanate, stir at a medium speed, and raise the temperatu...

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Abstract

The invention relates to a polyurethane curing agent production process, the reactants of which include polyethylene glycol, diisocyanate, polar non-protonated strong solvent, antioxidant, catalyst and neutralizing agent, dihydroxy carboxylic acid hydrophilic chain extender; It mainly adopts the preparation method of dropping reaction, the hydroxyl group and the isocyanate group react stably, and finally form a product with stable properties and stable storage; the product has a solid content of 90% and an isocyanate content of 12.5%; it has high solid content, High isocyanate content, good water solubility and emulsification effect, stable performance and so on.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a water-based polyurethane and a preparation method thereof. Background technique [0002] The application of water-based polyurethane emulsions or dispersions is becoming more and more widespread, and the performance of water-based products reflects the incomparable advantages of solvent-based products in some aspects. However, one-component water-based polyurethane has certain characteristics of hot-melt adhesives. In some applications, it is necessary to use a water-based curing agent to mix it with it, and react with active groups when heated to achieve the purpose of curing its film-forming properties. . Therefore, hydrophilic isocyanate curing agents have also been developed accordingly. The design of hydrophilic isocyanate curing agent is generally to add hydrophilic groups to polyisocyanate to achieve the purpose of emulsification in water. However, the products prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/34
CPCC08G18/7614C08G18/348C08G18/4833C08G18/6692
Inventor 应建忠
Owner 永嘉县信诚科技服务有限公司
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