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Preparation method for environment-friendly modified waterborne polyurethane

A water-based polyurethane, environmentally friendly technology, applied in the polymer field, can solve the problems of poor compatibility between organosiloxane and polyurethane, high temperature resistance, poor flexibility, etc., to achieve good mechanical properties, easy control of conditions, simple process. Effect

Inactive Publication Date: 2018-06-19
何俊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention provides a preparation method of environment-friendly modified water-based polyurethane, which is to use different prepolymers to modify the polyurethane prepolymer through physical blending, so as to overcome the poor water resistance, high temperature resistance and flexibility of a single prepolymer. The disadvantages of polysiloxane and prepolymer with active end groups are used to make silicone-modified polyurethane copolymers through addition polymerization and chain extension reaction, so as to overcome the poor compatibility of organosiloxane and polyurethane problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The present embodiment provides a kind of preparation method of environment-friendly 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 an agitator, after vacuum dehydration of polybutylene adipate (molecular weight M=21), add 1,4-butyl 4.5 grams of diol, 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, when the measured NCO content was less than 5.2%, cooled to 60 ° C, added 9.6 grams of dimethylol 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.

[0032] (2) Prepolymer B: In a three-necked flask equipped with a thermometer, a reflux condenser, and an agitator, after vacuum dehydrating the polyether polyol PPG ...

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 for environment-friendly modified waterborne polyurethane. The preparation method comprises the following steps: (1) separately preparing a polyester prepolymer and a polyalcohol prepolymer; (2) carrying out blending so as to obtain a composite polyurethane prepolymer; (3) modifying the composite polyurethane prepolymer with a polysiloxane oligomer so asto obtain organosilicon-modified polyurethane; (4) neutralizing the organosilicon-modified polyurethane with a neutralizer; (5) dispersing an emulsion with deionized water so as to obtain environment-friendly modified waterborne polyurethane with high comprehensive properties; and (6) removing solvents through vacuum-pumping so as to the product modified waterborne polyurethane. The preparation method is easy to operate and can easily realize large-scale production. According to the invention, different prepolymers are employed, and the polyurethane prepolymer is modified via physical blending and then subjected to addition polymerization and chain extension reaction with polysiloxane, so the technical problem of poor compatibility between organosiloxane and polyurethane is overcome, andthe product has high comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of an environment-friendly modified waterborne 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 solvent, the surface tension of the medium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/48C08G18/34C08G18/12C08G18/32C08G18/60C08G18/61C08G18/66C08G18/75
CPCC08G18/4238C08G18/0823C08G18/12C08G18/3206C08G18/3228C08G18/348C08G18/4018C08G18/48C08G18/603C08G18/61C08G18/6625C08G18/755C08G18/302
Inventor 何俊
Owner 何俊
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