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Preparation of polybutane diacid butanediol ester

A technology of polybutylene succinate and succinic acid, which is applied in the field of preparing polybutylene succinate, can solve the problems of low molecular weight, performance that cannot meet the actual use requirements, and small equilibrium constants.

Inactive Publication Date: 2003-06-18
中科启程新材料科技(海南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But there are a series of difficulties in the synthesis method of polybutylene succinate at present, for example, because the esterification reaction is a reversible reaction, the equilibrium constant is small, and the existence of low molecular by-products has a great influence on the molecular weight; Side reactions such as decarboxylation, cyclization, and thermal degradation are prone to occur, so the obtained polybutylene succinate often has a low molecular weight, and the general weight-average molecular weight is several thousand to ten thousand. The performance cannot meet the actual use requirements and must be further improved. its molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A total of 416 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid to butanediol is 1: 1, and the esterification reaction is carried out at a temperature of about 160° C., and then The polybutylene succinate was obtained by polycondensation at a temperature of 205° C. and reduced pressure to 30 Pa in the presence of p-toluenesulfonic acid for 7 hours; wherein, the amount of p-toluenesulfonic acid was 0.42 g. The weight average molecular weight M of the obtained polybutylene succinate w 48,000, molecular weight distribution M w / M n is 1.7.

Embodiment 2

[0017] A total of 506 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid and butanediol is 1.5: 1, and the normal pressure esterification reaction is carried out at a temperature of 150 ° C, and then The temperature is 235°C, and antimony trioxide and titanate are added successively, the pressure is reduced to 30Pa for polycondensation, and the reaction is 6 hours to obtain polybutylene succinate; among them, the total amount of antimony trioxide and titanate is 0.26 grams. The weight average molecular weight M of the obtained polybutylene succinate w 91,000, molecular weight distribution M w / M n is 2.1.

Embodiment 3

[0019] A total of 390 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid to butanediol is 3: 1, and the esterification reaction is carried out at a temperature of about 160° C., and then At a temperature of 270°C, organotin and cadmium acetate were added successively, reduced pressure to 30Pa for polycondensation, and reacted for 9 hours to obtain polybutylene succinate; wherein, the total amount of organotin and cadmium acetate used was 0.40 grams. The weight average molecular weight M of the obtained polybutylene succinate w 137,000, molecular weight distribution M w / M n is 1.9. The mechanical properties are shown in Table 1.

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Abstract

A process for preparing butanediol polysuccinate able to be fully biodegradated includes such steps as adding butanediol and butanedioic acid to reactor, esterifying reacting at 150-200 deg.C, and vacuum polycondensating at 200-280 deg.C under the existance of catalyst. It is a thermoplastic resin with 100,000 of mass average molecular weight and better mechanical performance.

Description

technical field [0001] The invention belongs to the field of methods for preparing polyester by condensation polymerization, in particular to polybutylene succinate prepared from butanediol and succinic acid as monomers, which are fully biodegradable polyesters prepared by condensation polymerization Alcohol ester method. Background technique [0002] "White pollution" is a worldwide issue. In today's deteriorating environment, how to solve the contradiction between the use of plastic products and environmental damage (such as the pollution of waste plastic film, waste foam packaging, plastic bags, etc. to the environment) is becoming more and more important. Therefore, the research and application of various "environmentally friendly materials" has received extensive attention, and the development and application of fully biodegradable plastics has become a research hotspot worldwide. [0003] Polybutylene succinate is a fully biodegradable polyme...

Claims

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Application Information

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IPC IPC(8): C08G63/672
Inventor 王晓青张伟严庆
Owner 中科启程新材料科技(海南)有限公司
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