A kind of flexible sulfonic acid type hydrophilic chain extender and its preparation method and application

A hydrophilic chain extender, sulfonic acid type technology, applied in the field of polyurethane materials, can solve problems such as hindering the industrial application of water-based polyurethane, restricting the practical application of water-based polyurethane, and reducing water resistance of polyurethane films, so as to ensure emulsifying performance and long-term stability. , Conducive to industrial application, the effect of increasing water resistance

Active Publication Date: 2022-06-07
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the dispersibility of polyurethane in water, the amount of chain extender is generally increased. However, such a higher amount of chain extender will cause the proportion of hydrophilic segments in the polyurethane molecular chain to increase, making the formed polyurethane film water resistant. It is greatly reduced, which greatly hinders the industrial application of waterborne polyurethane
In addition, since the chain extender is usually introduced into the polyurethane molecular chain with a hard segment, the proportion of the hard segment content in the polyurethane molecular chain is usually increased when the above-mentioned chain extender is used to synthesize waterborne polyurethane, and it is difficult to obtain a polyurethane material with high toughness. , which greatly restricts the practical application of water-based polyurethane in the field of leather and high-toughness film products

Method used

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  • A kind of flexible sulfonic acid type hydrophilic chain extender and its preparation method and application
  • A kind of flexible sulfonic acid type hydrophilic chain extender and its preparation method and application
  • A kind of flexible sulfonic acid type hydrophilic chain extender and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 8.1 g of ether diamine a-1, 22.9 g of sodium benzaldehyde-2-sulfonate, 0.1 g of p-toluenesulfonic acid, and 50 mL of dimethyl sulfoxide into the reaction flask, and react at room temperature for 5 h under stirring; add 6.1 g of sodium borohydride g, react at room temperature for 5 hours; precipitate the reaction mixture system in acetone twice, wash the obtained solid with a large amount of acetone, and vacuum dry to obtain 26.5 g of chain extender I-1.

[0040] The reaction formula is as follows:

[0041]

Embodiment 2

[0043] Add 11.1 g of ether diamine a-2, 21.8 g of benzaldehyde-4-sodium sulfonate, 0.11 g of p-toluenesulfonic acid, and 50 mL of dimethyl sulfoxide into the reaction flask, and react at room temperature for 5 h under stirring; add 5.9 g of sodium borohydride g, react at room temperature for 5 hours; precipitate the reaction mixture system in acetone twice, wash the obtained solid with a large amount of acetone, and vacuum dry to obtain 29.2 g of chain extender I-2.

[0044] The reaction formula is as follows:

[0045]

Embodiment 3

[0047] 28.0 g of ether diamine a-3, 2.08 g of benzaldehyde-4-sodium sulfonate, 0.56 g of p-toluenesulfonic acid, and 80 mL of dimethyl sulfoxide were added to the reaction flask, and the reaction was carried out at room temperature for 5 h under stirring; cyanoborohydrogenation was added. Sodium 1.0g, reacted at room temperature for 5h; the reaction mixture system was precipitated in acetone twice, the obtained solid was washed with a large amount of acetone, and dried in vacuo to obtain 27.2g of chain extender I-3.

[0048] The reaction formula is as follows:

[0049]

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Abstract

The invention relates to a flexible sulfonic acid type hydrophilic chain extender and its preparation method and application. The molecular structure general formula of this flexible sulfonic acid type hydrophilic chain extender is shown in I: wherein, R=H or CH 3 ; m=1 or 2; n is any integer from 1-20; x=1 or 2. The preparation method comprises the reaction of an aldehyde containing a sulfonic acid ion group and an ether diamine under the action of an acidic catalyst to generate an aldimine intermediate product, and then the aldimine intermediate product is reduced by a reducing agent to obtain the flexible sulfonate Acid type hydrophilic chain extender. The present invention also proposes the application of the above flexible sulfonic acid type hydrophilic chain extender or the flexible sulfonic acid type hydrophilic chain extender prepared by the above preparation method in the synthesis of aqueous polyurethane dispersion. The toughness of the polyurethane is further improved by the chain extender on the basis of improving the emulsification and water resistance of the polyurethane.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a flexible sulfonic acid type hydrophilic chain extender and a preparation method and application thereof. Background technique [0002] With the increasingly stringent global environmental protection requirements, solvent-based materials with high volatile organic compounds (VOCs) have been gradually banned from use. Water-based materials that are environmentally friendly and safe, and have low VOCs emissions have become alternative materials for the development of various industries. Industrialization has become the mainstream direction of global industrial development. [0003] Waterborne polyurethane is based on polyurethane resin and uses water instead of organic solvent as dispersion medium. The dispersion does not contain or contains a very small amount of organic solvent. Because of the combination of the high performance of solvent-based polyurethane and the low VOC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/66C08G18/48C08G18/42C07C303/32C07C309/46
CPCC08G18/3855C08G18/6685C08G18/4833C08G18/48C08G18/6648C08G18/4277C07C303/32C07C309/46
Inventor 穆有炳万晓波
Owner JIANGHAN UNIVERSITY
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