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Method for preparing transparent degradable polyurethane

A polyurethane and transparent technology, applied in the field of producing transparent degradable polyurethane and preparing transparent degradable polyurethane

Inactive Publication Date: 2013-03-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic molecules containing dipropylene carbonate can synthesize non-isocyanate polyurethane, but propylene carbonate has not been tried to make non-isocyanate polyurethane

Method used

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  • Method for preparing transparent degradable polyurethane
  • Method for preparing transparent degradable polyurethane
  • Method for preparing transparent degradable polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0013] The three-necked flask and the stirrer were fixed on the iron stand, and the propylene carbonate and 1,2-ethylenediamine were uniformly mixed in a 250mL three-necked flask in a molar ratio of 12:1, and the pH of the mixture was measured to be about 8-8.5, stirred, and put Heat, the color of the mixture becomes darker, the temperature rises rapidly, reaches the maximum value of 35°C and is constant, and the pH of the mixture is measured to be about 7.5~8. When the temperature drops by 3°C-5°C, put on the heating mantle, adjust the heating speed, start heating and continue Stir, and when the temperature measured by the thermometer reaches 130°C, adjust the heating mantle to keep the temperature at about 120°C, and heat at a constant temperature for 4 hours. A 12:1 ring-opening copolymer of ethylenediamine propylene carbonate was prepared. The reaction temperature and time are determined by the product viscosity method, until the product viscosity does not increase as the ...

Embodiment approach 2

[0015] The reaction system is the same as in Embodiment 1, propylene carbonate and 1,2-ethylenediamine are in a ratio of 10:1

Embodiment approach 3

[0017] The reaction system is the same as in Embodiment 1, propylene carbonate and 1,2-ethylenediamine are in a ratio of 8:1

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Abstract

The invention relates to a method for preparing transparent degradable polyurethane and belongs to the field of high polymer material synthesis. The method is characterized in that ring-opening reaction is carried out on propylene carbonate and diamine to generate carbamic acid ester containing dihydric alcohol with low molecular weight, and then reaction is carried out on the dihydric alcohol, polyhydric alcohol and polyisocyanate to generate polyurethane. According to the invention, the ring opening operation of the propylene carbonate is realized, and a new use is provided for the ring-opening product; compared with the conventional polyurethane, the polyurethane obtained by using the method disclosed by the invention is transparent and degradable, and can be used as an environment-friendly transparent degradable packaging, encapsulating and sealing material; the transparent material enables visual sense to be contacted with the articles directly and can achieve high quality with low cost in an evenly dyeing mode, thereby being an attractive means; and the innovation point of the invention is as follows: the ring opening operation is performed on the propylene carbonate and the product of the ring-opening reaction can be used for preparing the transparent degradable polyurethane.

Description

technical field [0001] The invention relates to a method for preparing transparent and degradable polyurethane, which belongs to the field of polymer material synthesis, and specifically relates to a method of using aliphatic diamine and propylene carbonate to induce ring-opening polymerization of propylene carbonate, and using the ring-opening polymer to produce transparent and degradable polyurethane. Method for degrading polyurethane. Background technique [0002] In recent years, due to the sharp increase in industrial carbon dioxide emissions, the global temperature has risen, that is, the "greenhouse effect". The research on the method of comprehensive utilization of carbon dioxide is related to major issues such as human survival and the environment. one. The most important application field of carbon dioxide is in chemical utilization, and it is the real conversion of carbon dioxide. Although some applications consume part of the carbon dioxide, but only changes in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/42C08G18/46C08G64/38C08G64/30
Inventor 朱晶心马彦龙雷红
Owner TAIYUAN UNIV OF TECH
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