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Process for preparing high-molecular aliphatic polyester

A technology of aliphatic polyester and high molecular weight, which is applied in the field of preparation of aliphatic polyester, can solve the problems of difficult synthesis and difficult control of feeding ratio, and achieve the effect of fast reaction speed and simple preparation method

Inactive Publication Date: 2007-03-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the feeding ratio is not easy to control, which brings certain difficulties to the synthesis.

Method used

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  • Process for preparing high-molecular aliphatic polyester
  • Process for preparing high-molecular aliphatic polyester
  • Process for preparing high-molecular aliphatic polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: the preparation of polybutylene adipate (PBA): with 50 parts of adipic acid, 37.5 parts of butanediol in parts by weight, 0.22 part of dibutyl tin oxide, 0.17 part of phosphorous acid under nitrogen protection , gradually increase the temperature from 140°C to 170°C for polycondensation, collect 70-80% of the generated water, switch to a decompression device, and gradually reduce the pressure to 1mmHg, and react at a temperature range of 190-220°C for 4-5 hours until the acid value is reduced to 3 or less, a PBA oligomer having a number average molecular weight of 3577 was obtained.

Embodiment 2

[0043] Example 2: 50 parts by weight of PBA oligomer (number average molecular weight is 3577) and 8.9 parts of N, N'-adipyl biscaprolactam prepared in Example 1 were reacted under nitrogen protection at 240°C under normal pressure for 30 Minutes, under reduced pressure (below 50mmHg) for 1.5 hours, the number average molecular weight of the polymer obtained was 26589.

Embodiment 3

[0044] Example 3: With reference to Example 1, the molar ratio of butanediol to adipic acid was changed to 1.17, and other conditions were exactly the same to synthesize PBA with a number average molecular weight of 5752. 50 parts by weight of PBA oligomers, 7.3 parts of N,N'-adipyl biscaprolactam, reacted at 240°C under normal pressure for 30 minutes under nitrogen protection, and reacted under reduced pressure (below 10mmHg) for 1.5 hours, the number of polymers obtained The average molecular weight is 32843.

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PUM

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Abstract

the invention discloses a preparing method of macromolecular aliphatic polyester, which is characterized by the following: proceeding melting polycondensation for diatomic alcohol and diacid; obtaining low-molecular hydroxy polyester prepolymer with even molecule at 2000-7000 or characteristic viscosity under 0.5; adopting aliphatic diacyl dilactone amide or aromatic diacyl dilactone amide to melt to expand chain; obtaining the product.

Description

technical field [0001] The invention relates to a method for preparing aliphatic polyester, in particular to a method for preparing high-molecular-weight aliphatic polyester with a number-average molecular weight of 26,600 to 50,700 by a two-step method of polycondensation and chain extension. Background technique [0002] Aliphatic polyester is a biodegradable material that can be widely used in many aspects such as medical treatment, agriculture, fishery, packaging, etc. It has good mechanical properties and can be degraded by itself without causing damage to the environment. [0003] In recent years, various methods have been used to obtain high molecular weight aliphatic polyesters. The aliphatic polyester is prepared by the usual polycondensation method. Due to the high polymerization temperature and side reactions such as thermal decomposition and thermal oxidation, it is difficult to obtain high molecular weight aliphatic polyester and it is difficult to meet the perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/78
Inventor 赵京波李开勇
Owner BEIJING UNIV OF CHEM TECH
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