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Zwitterionic hydrophilic chain extender and preparation method thereof

A technology of hydrophilic chain extender and zwitterion, which is applied in the field of zwitterionic hydrophilic chain extender and its preparation, can solve the problems of high preparation cost and strong toxicity, and achieve simple synthesis method, low toxicity and high solid content Effect

Active Publication Date: 2014-03-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zwitterionic hydrophilic chain extenders combine the characteristics of anionic and cationic chain extenders, but the existing zwitterionic hydrophilic chain extenders are expensive to prepare and highly toxic

Method used

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  • Zwitterionic hydrophilic chain extender and preparation method thereof
  • Zwitterionic hydrophilic chain extender and preparation method thereof
  • Zwitterionic hydrophilic chain extender and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0016] see figure 1 , the preparation method of the present invention comprises the following steps:

[0017] 1) Dissolve N-methyldiethanolamine and 1,3-propane sultone in ethanol with a mass concentration of 95%, heat and reflux for 7-9 hours to obtain a crude product; among them, the 1,3-propane used The molar ratio of sultone to N-methyldiethanolamine is 1: (1.1~1.4); and every 0.1mol of 1,3-propane sultone is dissolved in 20~30mL of ethanol with a mass concentration of 95%;

[0018] 2) Extract the crude product with petroleum ether to remove unreacted N-methyldiethanolamine, then distill petroleum ether and ethanol at 80-85°C to obtain a solid; distill the solid with absolute ethanol at 30-40°C Recrystallize under high temperature, and finally dry to obtain zwitterionic hydrophilic chain extender.

[0019] The synthesis method of the invention is simple, the product has high solid content, low cost and little pollution, and has wide application prospects in the field of ...

Embodiment 1

[0023] 1) Dissolve N-methyldiethanolamine and 1,3-propane sultone in ethanol with a mass concentration of 95%, heat and reflux for 7 hours to obtain a crude product; among them, the used 1,3-propane sultone The molar ratio of ester and N-methyldiethanolamine is 1:1.1; and every 0.1mol of 1,3-propane sultone is dissolved in 20mL of ethanol with a mass concentration of 95%;

[0024] 2) Extract the crude product with petroleum ether to remove unreacted N-methyldiethanolamine, then distill petroleum ether and ethanol at 80°C to obtain a solid; recrystallize the solid with absolute ethanol at 30°C, and finally Dry to obtain zwitterionic hydrophilic chain extender.

Embodiment 2

[0026] 1) Dissolve N-methyldiethanolamine and 1,3-propane sultone in ethanol with a mass concentration of 95%, heat and reflux for 7 hours to obtain a crude product; among them, the used 1,3-propane sultone The molar ratio of ester to N-methyldiethanolamine is 1:1.2; and every 0.1mol of 1,3-propane sultone is dissolved in 20mL of ethanol with a mass concentration of 95%;

[0027] 2) Extract the crude product with petroleum ether to remove unreacted N-methyldiethanolamine, then distill petroleum ether and ethanol at 80°C to obtain a solid; recrystallize the solid with absolute ethanol at 30°C, Finally dry to obtain zwitterionic hydrophilic chain extender.

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Abstract

The invention discloses a zwitterionic hydrophilic chain extender and a preparation method thereof. According to the invention, N-methyldiethanolamine and 1,3-propane suhone are dissolved in ethyl alcohol and heated for reflux reaction for 7-9 h to obtain a crude product, the unreacted N-methyldiethanolamine and the ethyl alcohol in the crude product are removed to obtain a solid, and then the solid is recrystallized at 30-40 DEG C by using absolute ethyl alcohol and finally dried to obtain the zwitterionic hydrophilic chain extender. The zwitterionic hydrophilic chain extender prepared according to the method has the characteristics of both negative ions and positive ions, so that the synthesized polyurethane has excellent surface activity. According to the invention, the ring-opening reaction of dimehtoxy-2-phenylacetophenone is used, so that the N-methyldiethanolamine and the 1,3-propane suhone react in the ethyl alcohol to obtain the zwitterionic hydrophilic chain extender. The synthesis method is simple, the raw materials are nontoxic or low in toxicity, the cost is low, the solid content of the product is high, less pollution is produced in the production and use processes, and the zwitterionic hydrophilic chain extender and the preparation method of the zwitterionic hydrophilic chain extender have a wide application prospect in the industry of polyurethane chain extenders.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a zwitterionic hydrophilic chain extender and a preparation method thereof. Background technique [0002] The relative molecular weight of the chain extender is relatively small, and the reaction is relatively active, so it can effectively adjust the reaction rate and make the reaction system quickly cross-link. The hydrophilic chain extender can make water-based polyurethane have good dispersibility or self-emulsification performance . Zwitterionic hydrophilic chain extenders combine the characteristics of anionic and cationic chain extenders, but the existing zwitterionic hydrophilic chain extenders have high preparation costs and strong toxicity. Contents of the invention [0003] The object of the present invention is to provide a zwitterionic hydrophilic chain extender with simple method, low cost and low toxicity and a preparation method thereof. ...

Claims

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Application Information

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IPC IPC(8): C08G18/32C07C309/14C07C303/32
CPCC07C303/32C07C309/14C08G18/0833C08G18/3857
Inventor 王学川任静强涛涛任龙芳
Owner SHAANXI UNIV OF SCI & TECH