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High-comprehensive property environment-friendly type modified aqueous polyurethane preparation method

A technology of water-based polyurethane with comprehensive performance, applied in the field of polymers, can solve the problems of poor compatibility between organosiloxane and polyurethane, high temperature resistance, poor flexibility, etc., and achieve good mechanical properties, easy control of conditions, and easy scale-up The effect of production

Inactive Publication Date: 2018-01-26
四川方壹特建筑工程有限公司
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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) Preparing prepolymer B" in step "1. Preparation of prepolymer".

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Abstract

The invention provides a high-comprehensive property environment-friendly type modified aqueous polyurethane preparation method. The method comprises the following steps: 1) respectively preparing a polyester performed polymer and a polyalcohol performed polymer; 2) blending the materials to obtain a composite polyurethane performed polymer; 3) using a polysiloxane oligomer to modify the compositepolyurethane performed polymer to obtain organosilicon-modified polyurethane; 4) using a neutralizer for neutralizing the organosilicon-modified polyurethane; 5) dispersing an emulsion with deionizedwater to obtain the high-comprehensive property environment-friendly type modified aqueous polyurethane; and 6) performing vacuum-pumping to remove a solvent to obtain the product, wherein the operation is easy and large-scale production is easy. The method employs different performed polymers, the polyurethane performed polymer is modified through physical blending, the performed polymer and polysiloxane are subjected to addition polymerization and chain extension to prepare the organosilicon-modified polyurethane copolymer, the technical problem of poor compatibility of organosiloxane and polyurethane is overcome, and the comprehensive properties of the product are high.

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 are successfully used in textiles, leather, and wood processing. , construction, paper and other industries. However, since water-based polyurethane uses water as a solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/66C08G18/42C08G18/48C08G18/60C08G18/61C08G18/12C08G18/32C08G18/34
Inventor 张优雨
Owner 四川方壹特建筑工程有限公司
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