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Preparation method of environment-friendly type modified waterborne polyurethane with high comprehensive property

A water-based polyurethane, comprehensive performance technology, applied in the polymer field, can solve the problems of high temperature resistance, poor flexibility, poor compatibility between organosiloxane and polyurethane, etc., and achieves easy control of conditions, good mechanical properties, and preparation methods. simple effect

Inactive Publication Date: 2018-05-01
遂宁市明川零贰零科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to use different prepolymers to modify polyurethane prepolymers by physical blending, to overcome the shortcomings of single prepolymers in water resistance, high temperature resistance, and poor flexibility, and to use polysiloxane with active end groups Silicone-modified polyurethane copolymers are prepared through addition polymerization and chain extension reactions with prepolymers to overcome the technical problem of poor compatibility between organosiloxanes and polyurethanes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a kind of preparation method of comprehensive performance high environmental protection type modified waterborne polyurethane, specifically comprises the following steps:

[0030] 1. Preparation of prepolymer

[0031] (1) Preparation of prepolymer A: in a three-necked flask equipped with a thermometer, a reflux condenser, and a stirrer, after vacuum dehydration of polybutylene adipate (molecular weight M=21), add 1,4- 4.5 grams of butanediol, 49.2 grams of isophorone diisocyanate, 12 grams of polyacetamide, 0.15 grams of dibutyltin dilaurate as a catalyst, reacted at 80°C for 3 hours, and when the NCO content was measured to be less than 5.2%, the temperature was lowered to 60°C. Add 9.6 grams of dimethylol propionic acid and 50 grams of acetone, react at 70°C for 3 hours, and obtain prepolymer A when the NCO is determined.

[0032] (2) Prepolymer B: In a three-necked flask equipped with a thermometer, a reflux condenser, and a stirrer, after v...

Embodiment 2

[0042] 1. Preparation of prepolymer

[0043] (1) Preparation of prepolymer A: in a three-necked flask equipped with a thermometer, a reflux condenser, and a stirrer, after vacuum dehydration of polybutylene adipate (molecular weight M=21), add 1,4- 4.5 grams of butanediol, 38.6 grams of toluene diisocyanate, 12 grams of polyacetamide, 0.14 grams of dibutyltin dilaurate as a catalyst, react at 80°C for 3 hours, and when the NCO content is measured to be less than 6.9%, cool down to 60°C and add dimethylol 9.4 grams of propionic acid and 50 grams of acetone were reacted at 70° C. for 3 hours, and prepolymer A was obtained when the NCO was reached.

[0044] (2) Preparation of prepolymer B: in a three-necked flask equipped with a thermometer, a reflux condenser, and a stirrer, after vacuum dehydration of the polyether polyol PPG (molecular weight M=21), add 1,4-butanediol 4.5 grams, 38.6 grams of toluene diisocyanate, 0.15 grams of dibutyltin dilaurate as a catalyst, react at 80°...

Embodiment 3

[0054] This example is basically the same as Example 1, with the difference that polytetrahydrofuran diol (PTMG) is used to replace polyether polyol in "(2) Preparation of prepolymer B" in the step "1. Preparation of prepolymer".

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Abstract

The invention provides a preparation method of an environment-friendly type modified waterborne polyurethane with high comprehensive property. The preparation method comprises the following steps of (1) respectively preparing a polyester prepolymer and a polyalcohol prepolymer; (2) blending, so as to obtain a composite polyurethane prepolymer; (3) using a polysiloxane oligomer to modify the composite polyurethane prepolymer, so as to obtain organosilicone modified polyurethane; (4) using a neutralizing agent to neutralize the organosilicone modified polyurethane; (5) using deionized water to disperse emulsion, so as to obtain the environment-friendly type modified waterborne polyurethane with high comprehensive property; (6) sucking vacuum, and removing a solvent, so as to obtain a product. The preparation method has the advantages that the operation is easy, and the scale production is easy; the different prepolymers are physically blended and modified to obtain the polyurethane prepolymer, and then the polyurethane prepolymer is subject to addition polymerizing and chain-extending reaction with polysiloxane, so as to obtain the organosilicone modified polyurethane copolymer; thetechnical problem of poorer compatibility between the organosiloxane and the polyurethane is solved; the comprehensive property is higher.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a method for adopting comprehensive performance and high environment-friendly modified water-based polyurethane. Background technique [0002] With the enhancement of people's awareness of environmental protection, more and more attention has been paid to the safety of materials, and higher and higher standards and requirements have been put forward for other daily necessities such as packaging lamination adhesives and leather coatings. Water-based polyurethane (WPU) is a polyurethane emulsion that uses water as the dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has the advantages of simple use, non-toxicity, and no environmental pollution. Its products have been successfully used in textiles, leather, and wood processing. , construction, paper and other industries. However, since water-based polyurethane uses water as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/66C08G18/48C08G18/42C08G18/61C08G18/34C08G18/32C08G18/12
CPCC08G18/755C08G18/0823C08G18/12C08G18/3206C08G18/348C08G18/4238C08G18/48C08G18/4854C08G18/61C08G18/7614C08G18/3228
Inventor 张成华吴中阳
Owner 遂宁市明川零贰零科技有限公司