Flexible sulfonic acid type hydrophilic chain extender as well as preparation method and application thereof

A hydrophilic chain extender and sulfonic acid-type technology, which is applied in the field of polyurethane materials, can solve the problems of the water resistance of polyurethane films, hinder the industrial application of water-based polyurethane, and restrict the practical application of water-based polyurethane, so as to increase water resistance and ensure emulsification performance And long-term stability, beneficial to the effect of industrial application

Active Publication Date: 2021-02-02
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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  • Flexible sulfonic acid type hydrophilic chain extender as well as preparation method and application thereof
  • Flexible sulfonic acid type hydrophilic chain extender as well as preparation method and application thereof
  • Flexible sulfonic acid type hydrophilic chain extender as well as preparation method and application thereof

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 with stirring for 5 hours; add sodium borohydride 6.1 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 obtain 26.5 g of chain extender I-1 after vacuum drying.

[0040]The reaction formula is as follows:

[0041]

Embodiment 2

[0043]Add 11.1 g of ether diamine a-2, 21.8 g of sodium benzaldehyde-4-sulfonate, 0.11 g of p-toluenesulfonic acid, and 50 mL of dimethyl sulfoxide into the reaction flask, and react at room temperature with stirring for 5 hours; add sodium borohydride 5.9 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 obtain 29.2 g of chain extender I-2 after vacuum drying.

[0044]The reaction formula is as follows:

[0045]

Embodiment 3

[0047]Add 28.0 g of ether diamine a-3, 2.08 g of sodium benzaldehyde-4-sulfonate, 0.56 g of p-toluenesulfonic acid, and 80 mL of dimethyl sulfoxide into the reaction flask, and react at room temperature with stirring for 5 hours; add cyanoborohydride Sodium 1.0g, reaction 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 after vacuum drying, 27.2g of chain extender I-3 was obtained.

[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 as well as a preparation method and application thereof. The molecular structural general formula of the flexible sulfonic acid type hydrophilic chain extender is shown as I in the description, wherein R is H or CH3; m is equal to 1 or 2; n is any integer of 1-20; and x is equal to 1 or 2. The preparation method comprises the steps of reacting aldehyde containing sulfonic acid ion groups with ether diamine under the action of an acidic catalyst to generate an aldimine intermediate product, and reducing the aldimine intermediate product by using a reducing agent to obtain the flexible sulfonic acid type hydrophilic chain extender. The invention also provides application of the flexible sulfonic acid type hydrophilic chain extender or the flexible sulfonic acid type hydrophilic chain extender prepared by the preparation method in synthesis of a waterborne polyurethane dispersion. Through the chain extender,the toughness of polyurethane is further improved on the basis of improving the emulsifying property and water resistance of 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 requirements for environmental protection in the world, solvent-based materials with high volatile organic compounds (VOCs) have gradually been banned. Environmentally friendly, safe, and water-based materials with low VOCs emissions have become alternative materials for the development of various industries. Globalization has become the mainstream direction of global industrial development.[0003]Waterborne polyurethane is based on polyurethane resin and water instead of organic solvent as the dispersion medium. The dispersion contains no or very small amount of organic solvent, because it combines the high performance of solvent-based polyurethane and the low VOCs content of water-based materials. The advantages can be wid...

Claims

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Application Information

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Patent Type & Authority Applications(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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