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A kind of method adopting rear chain extender to prepare waterborne polyurethane

A water-based polyurethane, post-chain extension technology, applied in the field of polyurethane

Active Publication Date: 2022-06-21
张家港市东方高新聚氨酯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problems in the synthesis and application of water-based polyurethane, the present invention provides a method for preparing water-based polyurethane by using a post-chain extender to achieve the following objectives of the invention:

Method used

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  • A kind of method adopting rear chain extender to prepare waterborne polyurethane
  • A kind of method adopting rear chain extender to prepare waterborne polyurethane
  • A kind of method adopting rear chain extender to prepare waterborne polyurethane

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Effect test

Embodiment 1

[0026] Embodiment 1 A kind of method that adopts post-chain extender to prepare waterborne polyurethane

[0027] Include the following steps:

[0028] (1) Add polyol, isocyanate, catalyst

[0029] Dehydrate 50 parts by mass of polyol under vacuum at 80°C and 0.09Mpa for 2.5 hours, adjust the reaction temperature to 85°C, add 34 parts by mass of isocyanate according to the proportion, add 0.1 part by mass of catalyst after reacting for 1 hour, and continue the reaction for 1 hour;

[0030] Described catalyst is dibutyltin dilaurate;

[0031] Described polyhydric alcohol is polytetrahydrofuran diol;

[0032] The isocyanate is isophorone diisocyanate.

[0033] (2) Add hydrophilic chain extender and solvent

[0034] Add 6.5 parts by mass of hydrophilic chain extender and 5 parts by mass of solvent, and react at 80°C for 2 hours;

[0035] The hydrophilic chain extender is 2,2-dimethylolpropionic acid (DMPA);

[0036] The solvent is N-methylpyrrolidone.

[0037] (3) neutraliz...

Embodiment 2

[0046] On the basis of embodiment 1, only change the kind of rear chain extender, adopt EDA and A50 to test as rear chain extender, test result is as follows:

[0047] Table 1 Appearance and stability of waterborne polyurethane emulsion

[0048]

[0049] When the amount of DMPA is the same, after adding the chain extender, the emulsion changes from transparent to translucent emulsion, and the three emulsions have good stability after stability testing.

[0050] Particle size and viscosity of table 2 aqueous polyurethane emulsion

[0051]

[0052] When the amount of DMPA is the same, adding EDA as a post-chain extender can reduce the viscosity of the emulsion and have a proper effect on increasing the particle size of the emulsion. When A50 is used as a post-chain extender, it can reduce the viscosity of the emulsion and significantly reduce the particle size of the emulsion.

[0053] Table 3 Mechanical properties of waterborne polyurethane

[0054]

[0055] When the...

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Abstract

The invention provides a method for preparing water-based polyurethane by using a post-chain extender. The method includes adding a post-chain extender; the post-chain extender is EDA. The water-based polyurethane prepared by the present invention is light blue translucent emulsion, and the stability is more than 6 months; the water-based polyurethane prepared by the present invention has an emulsion viscosity of 14-15mPa s, and the emulsion particle size is 28-29 nm; prepared by the present invention High-quality water-based polyurethane, the tensile strength is 9-10MPa, the elongation at break is 400-405%; the water absorption rate is 3.3-3.7%.

Description

technical field [0001] The invention relates to the preparation of water-based polyurethane, in particular to a method for preparing water-based polyurethane by using a post-chain extender, and belongs to the technical field of polyurethane. Background technique [0002] Waterborne polyurethane (WPU) is a block polymer composed of soft soft segments and rigid hard segments, and is dispersed in water in the form of latex particles to form an emulsion. After the 1980s, due to the development of synthetic technology, the performance of water-based polyurethane continued to improve, prompting it to enter a stage of rapid development. Water-based polyurethane emulsion is widely used in fabric coating finishing, coatings, adhesives, glass fiber sizing, shoe chemical Use resin and other directions. After entering the 21st century, due to the increasing environmental protection requirements worldwide, the pace of development of the waterborne polyurethane industry has been accelera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/48C08G18/32C08G18/34C08G18/12
CPCC08G18/10C08G18/12C08G18/6659C08G18/4854C08G18/3228C08G18/348
Inventor 曲建波王建勇张志浩张海涛
Owner 张家港市东方高新聚氨酯有限公司