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Preparation method of polyurethane curing agent

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

Inactive Publication Date: 2018-03-13
永嘉县信诚科技服务有限公司
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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 content, poor product stability and consistency, etc.

Method used

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Embodiment Construction

[0012] The preparation method of polyurethane curing agent of the present invention, its reaction substance comprises polyethylene glycol, diisocyanate, polar non-protonated strong solvent, antioxidant, catalyst and neutralizing agent, dihydroxy carboxylic acid hydrophilic chain extender; mainly Its preparation method is:

[0013] 1) Feed polyethylene glycol with a molecular weight of 400, put 916 parts into the material 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-diethylformamide, 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 reaction kettle, pass nitrogen protection, open the reflux valve, feed 1000 parts of diphenylmeth...

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Abstract

The invention relates to a preparation method of a polyurethane curing agent, the reaction substances of which include polyethylene glycol, diisocyanate, polar non-protonated strong solvent, antioxidant, catalyst and neutralizing agent, dihydroxy carboxylic acid hydrophilic chain extender ;Mainly adopt the preparation method of dropping reaction, the dihydroxy carboxylic acid hydrophilic chain extender is used together with polyethylene glycol after forming a salt, so that it can be polymerized with isocyanate to form a linear molecular structure with excellent hydrophilicity, hydroxyl group and isocyanate The group reacts smoothly, and finally forms 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, and stable performance Features.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a preparation method of water-based polyurethane. 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 prepared by exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34
CPCC08G18/6692C08G18/348C08G18/4825C08G18/4833
Inventor 应建忠
Owner 永嘉县信诚科技服务有限公司
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