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Copolyester as well as preparation method and product

A technology of copolyester and products, applied in the field of copolyester and its preparation, can solve the problems of high crystallinity, high melting point, large processing method and application limitations, and achieve the effect of good gas barrier performance and good performance

Active Publication Date: 2019-03-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently artificially synthesized degradable polymer materials mainly include polylactic acid, polyglycolic acid, polybutylene terephthalate adipate, polybutylene succinate, etc., which have certain limitations.
For example, polyglycolic acid is a linear aliphatic polyester with high crystallinity and high melting point, insoluble in common organic solvents, and has great limitations in processing methods and applications; moreover, glycolic acid has insufficient thermal stability and is not suitable for polycondensation Highly susceptible to thermo-oxidative degradation under reaction conditions

Method used

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  • Copolyester as well as preparation method and product
  • Copolyester as well as preparation method and product
  • Copolyester as well as preparation method and product

Examples

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preparation example Construction

[0047] The present invention also provides a kind of preparation method of copolyester, described preparation method comprises:

[0048] S1, mixing a dibasic carboxylic acid or its anhydride or its diester with a dibasic alcohol and a catalyst to carry out an esterification reaction to obtain a polyester oligomer;

[0049] S2, mixing the polyester oligomer and the polyglycolic acid oligomer for polycondensation reaction to obtain copolyester.

[0050] In step S1, the molar ratio of the dicarboxylic acid or its anhydride or its diester to the dihydric alcohol is 1:1.1˜1:2.5.

[0051] Considering that the activity of the dibasic carboxylic acid diester is better, it is preferable to carry out the esterification reaction between the dibasic carboxylic acid diester and the dibasic alcohol.

[0052] Specifically, the esterification reaction is carried out under the protection of an inert gas such as nitrogen, and the catalyst used in the esterification reaction is the first catalyst...

Embodiment 1

[0081] The copolyester of this embodiment is defined as PBFGA30, and m:n is 70:30 in PBFGA30, and concrete preparation process is as follows:

[0082] (1) Preparation of polyester oligomers by esterification: first put 0.5 moles of dimethyl 2,5-furandicarboxylate, 1.25 moles of 1,4-butanediol, and 100 mg of tetrabutyl titanate into the reactor , under the protection of high-purity nitrogen, react at 200° C. for 4 h, until the content of methanol produced exceeds 95% of the theoretical value, and obtain a polyester oligomer with a structural formula such as formula (3).

[0083] (2) Dehydration condensation reaction to prepare polyglycolic acid oligomers: put glycolic acid into the reactor, add zinc acetate, the temperature is 150°C, reduce the pressure to 1000Pa, the dehydration condensation reaction time is 2h, and the obtained structural formula is as follows: ) represented by the polyglycolic acid oligomer, the polyglycolic acid oligomer has a melting point of 145°C.

[00...

Embodiment 2

[0091] The copolyester of this embodiment is defined as PBFGA40, m in PBFGA40: n is 60:40, and concrete preparation process is as follows:

[0092] (1) Preparation of polyester oligomers by esterification: first put 0.5 moles of dimethyl 2,5-furandicarboxylate, 0.55 moles of 1,4-butanediol, and 100 mg of tetrabutyl titanate into the reactor , under the protection of high-purity nitrogen, react at 180° C. for 6 h, until the content of methanol produced exceeds 95% of the theoretical value, and obtain a polyester oligomer with the structural formula shown in formula (3).

[0093] (2) Dehydration condensation reaction to prepare polyglycolic acid oligomers: put glycolic acid into the reactor, add zinc acetate, the temperature is 150 ° C, the pressure is reduced to 300Pa, the dehydration condensation reaction time is 1h, and the structural formula is obtained as formula (4 ) represented by the polyglycolic acid oligomer, the polyglycolic acid oligomer has a melting point of 140°C....

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Abstract

The invention relates to copolyester as well as a preparation method and a product. The structural formula of the copolyester is shown as the formula (1), wherein R1 represents a structural unit of dicarboxylic acid or its anhydride or diester, R2 represents a structural unit of dihydric alcohol, m and n represent the degree of polymerization, and the ratio of m to n is equal to (99: 1)-(30: 70).The preparation method of the copolyester comprises the following steps: mixing the dicarboxylic acid or its anhydride or diester, the dihydric alcohol and a catalyst for an esterification reaction, so as to obtain a polyesteroligomer; and mixing the polyesteroligomer and a polyglycolic acidoligomer for a polycondensation reaction, so as to obtain the copolyester. The preparation method of the copolyester is simple and is low in cost; the obtained copolyester is large in molecular weight and excellent in thermal property and mechanical property; and in addition, the copolyester is biodegradable under the catalysis of lipase, and therefore, the copolyester can be used for preparing products such as a thin film and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of degradable materials, in particular to copolyester and its preparation method and products. Background technique [0002] With the development of society, the environmental protection requirements for polymer materials are getting higher and higher. The development of degradable polymer materials can effectively alleviate the problem of white pollution caused by polymer materials. However, the currently artificially synthesized degradable polymer materials mainly include polylactic acid, polyglycolic acid, polybutylene terephthalate adipate, polybutylene succinate, etc., which have certain limitations. For example, polyglycolic acid is a linear aliphatic polyester with high crystallinity and high melting point, insoluble in common organic solvents, and has great limitations in processing methods and applications; moreover, glycolic acid has insufficient thermal stability and is not suitable for polyconden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/66C08G63/60
CPCC08G63/60C08G63/66C08G2310/00C08G2230/00
Inventor 胡晗张若愚王静刚朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI