Self-emulsifying waterborne polyurethane curing agent and preparation method thereof

A water-based polyurethane, self-emulsifying technology, applied in the directions of polyurea/polyurethane adhesive, polyurea/polyurethane coating, sulfonic acid preparation, etc. The effect of high effective functionality, wide application range and low viscosity

Active Publication Date: 2017-08-22
FOSHAN JINGXIN HUIMING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106366291A discloses directly adding isethionic acid or isethionate to react with isocyanate to make a water-based polyurethane curing agent containing sulfonic acid groups, but this patent does not disclose the method of removing moisture in the sulfonic acid group compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] A preparation method of self-emulsifying type water-based polyurethane curing agent, comprising the following steps:

[0043] a) Preparation of small-molecule diols containing sulfonic acid groups: use small-molecule diols and dicarboxysulfonates as raw materials, or use small-molecule dicarboxylic acids, dihydroxysulfonates and small-molecule diols as The raw material is obtained through esterification reaction to obtain a small molecule diol containing sulfonic acid groups with a molecular weight of 350-1000, which is dissolved in an organic solvent to obtain a spare material A;

[0044] b) Preparation of diisocyanate prepolymer containing sulfonic acid groups: use diisocyanate, organic solvent and the spare material A obtained in step a) in the amount of 0wt%~80wt% according to the formula, and react to prepare diisocyanate prepolymer containing sulfonic acid groups. Isocyanate prepolymers;

[0045] c) Preparation of sulfonic acid group-modified polyurethane prepoly...

Embodiment 1

[0073] a. Preparation of small molecular diols containing sulfonic acid groups

[0074] In a four-necked flask equipped with a fractionation device, add 100g of isophthalic acid-5-sodium sulfonate, 92.5g of 1,4-butanediol, 80g of deionized water and 0.161g of tetrabutyl titanate, nitrogen protection, Reflux at 160°C for 2 hours, then raise the temperature by 10°C every 0.5 hours, collect fractions in the water separator until the temperature reaches 210-220°C, keep it warm for 1 hour, vacuumize at 220°C and 1KPa for 2 hours, cool down to 100°C, add 100g of ethyl acetate was stirred evenly, then the temperature was lowered to 60°C, and the material was discharged; 52g of the spare material A of the formula was weighed.

[0075] b. Preparation of sulfonic acid group-modified HDI prepolymer with NCO groups at both ends

[0076] In a three-necked reaction flask, add 140g HDI and 46g ethyl acetate, stir evenly, add 40g spare material A, react at 60-70°C for 1 hour, then rise to 90...

Embodiment 2

[0082] a. Preparation of raw materials A

[0083] The small molecular dihydric alcohol containing sulfonic acid group was prepared according to the method of step a of Example 1.

[0084] In the spare material preparation bottle, add 49.2g of small molecule diols with a molecular weight of 600 containing sulfonic acid groups and 21g of butyl acetate, stir and dissolve evenly, and prepare 70g of spare material A.

[0085] b. Preparation of sulfonic acid group-modified HDI prepolymer with NCO groups at both ends

[0086] In the three-necked reaction flask, add 184g HDI and 64g butyl acetate, stir evenly, add 52g spare material A, react at 60-70°C for 1 hour, then rise to 90-100°C for 4 hours.

[0087] c. Preparation of sulfonic acid group-modified HDI biuret with multifunctional NCO group at the end

[0088] Lower the temperature below 70°C, first add 3g of water, react at 70°C for 0.5 hours, then raise the temperature to 80-90°C for 2 hours, then raise the temperature to 120-...

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Abstract

The invention discloses a self-emulsifying waterborne polyurethane curing agent and a preparation method thereof. The self-emulsifying waterborne polyurethane curing agent takes micromolecule dihydric alcohol containing a sulfonic acid group with a molecular weight of 350 to 1,000 and diisocyanates as raw materials to prepare the sulfonic acid group modifying self-emulsifying waterborne polyurethane curing agent with a multifunctional NCO group on a terminal. The invention also discloses a preparation method of the self-emulsifying waterborne polyurethane curing agent. The self-emulsifying waterborne polyurethane curing agent has the advantages of good water dispersibility, good storage stability, good water resistance of coating film, high strength property and the like, and is suitable for mating with waterborne polyurethane dispersion, waterborne acrylic emulsion and waterborne alkyd resin and the like, prepared two-component polyurethane coatings and adhesives by the self-emulsifying waterborne polyurethane curing agent are especially suitable for some special performance requirements of waterborne products. The self-emulsifying waterborne polyurethane curing agent disclosed by the invention can also be used for mating with hydroxyl components of the solvent-type two-component coatings and the adhesives to produce a two-component solvent type and has a wide range of application.

Description

technical field [0001] The invention relates to a self-emulsifying water-based polyurethane curing agent and a preparation method thereof. Background technique [0002] With the limitation of VOC by the national environmental protection regulations and the continuous enhancement of people's environmental awareness, the development and application of waterborne polyurethane coatings and adhesives have attracted more and more attention. Water-based polyurethane coatings and adhesives can be divided into one-component and two-component. The polymer molecular weight of the one-component water-based polyurethane dispersion is relatively large, and chemical crosslinking between molecules does not occur during the film-forming process. It has the advantages of convenient construction and disadvantages. The strength performance is poor, and the application is limited; the two-component water-based polyurethane coating is composed of a hydroxyl-containing water-based resin and an iso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/10C08J3/03C09D175/14C09J175/06C09D175/04C07C303/04C07C309/08
Inventor 周建明何绍群刘晓鸿罗铭荣
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
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