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Technical method for preparing aliphatic polyester

A process method and technology of aliphatic dibasic acid, applied in the field of condensation polymerization to prepare fully biodegradable polyester, can solve the problems of long reaction time and achieve high reaction rate, good color and good molding processability

Inactive Publication Date: 2008-03-05
李鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the reaction time is too long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a 10L stainless steel reactor with agitator, fractionation tower and condenser, add 3000g of succinic acid and 2500g of 1,4-butanediol. At a temperature of about 160°C, carry out normal pressure esterification; then at a temperature of 200°C, add 3g of titanium glycolate and 1.2g of triphenyl phosphite, reduce the pressure to 3000Pa for pre-condensation, and react for 1 hour; then The reaction mixture was transferred to a 5L horizontal polymerization reactor, 3g of titanium ethylene glycol was added, and at 230°C, the pressure was reduced to 10Pa, and the reaction was carried out for 3 hours to obtain polybutylene succinate. The weight average molecular weight of the product obtained was M w 292,000, molecular weight distribution M w / M n is 1.9. The chroma b value is 0.5.

Embodiment 2

[0030] In a 10L stainless steel reaction kettle with a stirrer, a fractionation tower, and a condenser, 2400 g of succinic acid, 740 g of adipic acid, and 2750 g of 1,4-butanediol were added. At a temperature of about 150°C, the atmospheric pressure esterification reaction is carried out, and then at a temperature of 190°C, TiO 2 / SiO 2 2.5g, 1.0g of triphenyl phosphite, pre-condensed under reduced pressure to 4000Pa, reacted for 1.5 hours; then transferred the reaction mixture to a 5L horizontal polymerization reactor, added TiO 2 / SiO 2 2.5g, at 230°C, reduced pressure to 20Pa, reacted for 2.5 hours to obtain poly(succinic acid-adipate) glycol ester, the weight average molecular weight of the product obtained was M w 285,000, molecular weight distribution M w / M n is 1.7. The chroma b value is 1.5.

Embodiment 3

[0032]In a 10L stainless steel reaction kettle with agitator, fractionation tower and condenser, add 2900g of succinic acid and 1900g of ethylene glycol. At a temperature of about 160°C, carry out normal-pressure esterification; then at a temperature of 200°C, add 3.5 g of ethylene glycol germanium and 1.5 g of triisopropyl phosphite, reduce the pressure to 4000 Pa for pre-condensation, and react for 2 hours Then the reaction mixture was transferred to a 5L horizontal polymerization reactor, 3.5g of titanium ethylene glycol was added, and at 220°C, the pressure was reduced to 20Pa, and the reaction was carried out for 2 hours to obtain polyethylene succinate. The weight of the product obtained was Average molecular weight M w 255,000, molecular weight distribution M w / M n is 2.1. The chroma b value is 1.5.

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Abstract

The technological process of preparing aliphatic polyester adopts aliphatic dibasic acid and dibasic alcohol monomers and one complex catalyst system, and includes three synthesis steps including esterification, pre-polycondensation and final polycondensation. The process has no need of chain expanding reaction and short polyester synthesizing period, and can prepare thermoplastic resin with weight average molecular weight up to 200 KDa, excellent forming performance and no yellowing.

Description

technical field [0001] The invention belongs to the method field of preparing fully biodegradable polyester by condensation polymerization. The invention relates to a method for preparing high-molecular-weight aliphatic dibasic acid diol polyester by using aliphatic dibasic acid and dibasic alcohol as monomers and adopting a three-stage synthesis process of esterification, precondensation and final polycondensation. Background technique [0002] Fully biodegradable polymer materials have been considered as one of the main ways to solve the increasingly serious "white pollution" problem caused by traditional plastic products in the past two decades. Aliphatic polyesters are currently the most studied fully biodegradable polymer materials. The aliphatic dibasic acid diol ester synthesized by condensation polymerization is relatively cheap, and can be molecularly designed to reduce production costs. It is expected to replace traditional plastics in some fields and alleviate en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/78C08G63/85
Inventor 李鹏
Owner 李鹏
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