Bio-based copolyester, preparation method and application thereof

A copolyester, bio-based technology, applied in the field of polymer material synthesis, to achieve the effects of enhancing water vapor barrier properties, improving heat resistance, and reducing chain segment mobility

Pending Publication Date: 2022-01-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few reports on aliphatic aromatic copolyesters based on 2,5-thiophenedicarboxylic acid at home and abroad.

Method used

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  • Bio-based copolyester, preparation method and application thereof
  • Bio-based copolyester, preparation method and application thereof
  • Bio-based copolyester, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a kind of bio-based copolyester, and its preparation method comprises:

[0041] (1) Add 2,5-thiophenedicarboxylic acid, dimethyl 1,4-butanedioate and 1,3-propanediol with a molar ratio of 7:3 into a 250mL three-necked flask, the alkyd (ester) ratio 1.2:1, then add zinc acetate with a total molar weight of 5‰ of 2,5-thiophenedicarboxylic acid and 1,4-dimethyl succinate monomer, and connect one end of the three-necked flask to nitrogen gas, and the other end to water separator and condenser , The middle port is connected with a mechanical stirring device, and then the three-necked flask is heated in an oil bath, the reaction temperature is 210° C., and the reaction time is 5 hours.

[0042] (2) After the reaction is completed, lower the temperature, then add zinc acetate with a total molar weight of 5‰ of 2,5-thiophenedicarboxylic acid and dimethyl 1,4-succinate, stir for a period of time, and then heat up to 230°C. The vacuum is below 50Pa, and ...

Embodiment 2

[0048] This embodiment provides a kind of bio-based copolyester, and its preparation method comprises:

[0049] (1) Add 2,5-thiophenedicarboxylic acid, 1,4-butanedioic acid and 1,3-propanediol with a molar ratio of 6:4 into a 250mL three-necked flask with an alkyd ratio of 1.1:1, three-necked One end of the flask is connected with nitrogen gas, the other end is connected with a water separator and a condenser, and the middle port is connected with a mechanical stirring device. Then the three-neck flask was placed in an oil bath and heated, the reaction temperature was 190° C., and the reaction time was 3 hours.

[0050] (2) After the reaction is completed, lower the temperature, and then add tetrabutyl titanate with a total molar weight of 0.5‰ of monomers of 2,5-thiophenedicarboxylic acid and 1,4-succinic acid. After stirring for a period of time, the temperature was raised to 230°C, and the vacuum was evacuated to below 50Pa, and the reaction was terminated after the obviou...

Embodiment 3

[0057] This embodiment provides a kind of bio-based copolyester, and its preparation method comprises:

[0058] (1) dimethyl 2,5-thiophenedicarboxylate, 1,4-butanedioic acid and 1,3-propylene glycol with a molar ratio of 5:5 are added to a 250mL three-necked flask, and the alkyd (ester) ratio is 1.1:1, then add dimethyl 2,5-thiophenedicarboxylate and antimony oxide with a total molar weight of 2‰ of 1,4-butanedioic acid monomers, connect one end of the three-necked flask to nitrogen gas, and the other end to a water separator and condenser, The middle port is connected with a mechanical stirring device. Then the three-necked flask was placed in an oil bath and heated, the reaction temperature was 200° C., and the reaction time was 4 hours.

[0059] (2) After the reaction is completed, the temperature is lowered, and antimony oxide with a total molar weight of 2‰ of monomers of 2,5-thiophenedicarboxylate and 1,4-succinic acid is added. After stirring for a period of time, the...

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Abstract

The invention relates to bio-based copolyester, a preparation method and application thereof. The preparation method comprises the following steps: (1) in the presence of a catalyst, mixing dibasic acid or a corresponding diester compound thereof with 1, 3-propylene glycol or 1, 3-propylene glycol and other diol for esterification or ester exchange reaction to obtain a prepolymer, wherein the dibasic acid comprises 2, 5-thiophenedicarboxylic acid and 1, 4-succinic acid; and (2) carrying out vacuum condensation polymerization reaction on the prepolymer and the catalyst to obtain the bio-based copolyester. According to the present invention, a rigid asymmetric 2, 5-thiophenedicarboxylic acid unit and a short-chain 1, 3-propylene glycol unit are introduced into the main chain of a copolymer molecule in a random copolymerization manner, such that the heat resistance of the copolyester material can be improved while the water vapor barrier property of the copolyester material can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis, in particular, the invention relates to a bio-based copolyester and its preparation method and application. Background technique [0002] Bio-based polymers generally refer to naturally occurring polymers or polymers synthesized by biological or chemical methods using renewable resources as raw materials. The use of bio-based polymers helps to get rid of the dependence on petrochemical resources, and has the characteristics of low carbon and environmental protection. In recent years, it has become a research hotspot in the field of materials. Polyester is a kind of heterochain polymers containing ester groups in the main chain. Aliphatic polybasic acid glycol esters generally have good biodegradability, but their water vapor barrier performance is poor, and their heat resistance performance is still to be determined. improve. For example, the water vapor transmission coeffici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688C08G63/83C08G63/85C08G63/86C08L67/02
CPCC08G63/6886C08G63/83C08G63/85C08G63/866C08G63/863C08L67/02
Inventor 郭宝华田素男徐军
Owner TSINGHUA UNIV
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