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Bio-based copolyester as well as preparation method and application thereof

A copolyester and bio-based technology, which is applied in the field of bio-based copolyester and its preparation, can solve the problems of unfavorable long-term development of the polyester industry, poor UV resistance, and limited application, so as to increase the glass transition temperature and improve Barrier property, effect of reducing crystallinity

Pending Publication Date: 2021-08-24
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its general toughness, poor barrier properties, and poor UV resistance limit its wider application.
[0004] At present, although terephthalic acid-modified PBS copolyester PBST is completely biodegradable, the modified monomer terephthalic acid is a petroleum-based monomer, which is not conducive to the long-term development of the polyester industry.

Method used

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  • Bio-based copolyester as well as preparation method and application thereof
  • Bio-based copolyester as well as preparation method and application thereof
  • Bio-based copolyester as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Under the action of isopropyl titanate, 1,4-dimethyl succinate, 4,4'-biphenyldimethanol and 1,4-butanediol are added to the reaction flask, 4, 4'-biphenyldimethanol and 1,4-butanediol in a molar ratio of 3:1,4,4'-biphenyldimethanol and 1,4-butanediol to dimethyl 1,4-succinate The molar ratio of diol is 0.11:1. The isopropyl titanate accounts for 0.3% of the mass percentage of dimethyl 1,4-succinate, and under the protection of nitrogen, it is stirred and reacted at 190° C. for 4 hours to form a prepolymer.

[0032] (2) Vacuumize the above-mentioned prepolymer to 5Pa, stir and react at 235°C for 5h to obtain copolyester.

[0033] Tensile performance test conditions: test according to ASTM D-638 standard, dumbbell-shaped sample (dimensions of the middle test part: width: 5mm, thickness: 1.6mm), tensile rate: 5mm / min. The tensile properties are shown in Table 1. The glass transition temperature is tested by differential scanning calorimetry (DSC). The test procedure...

Embodiment 2

[0035] (1) Under the action of ethylene glycol antimony, add 1,4-dimethyl succinate, 4,4'-biphenyldimethanol and 1,4-butanediol into the reaction flask, 4,4 '-Biphenyl dimethanol and 1,4-butanediol in a molar ratio of 3:1,4,4'-biphenyl dimethanol and 1,4-butanediol to dimethyl 1,4-succinate The molar ratio of alcohol is 0.2:1. Antimony ethylene glycol accounts for 0.3% by mass of dimethyl 1,4-succinate, and under nitrogen protection, the mixture is stirred and reacted at 190° C. for 4 hours to form a prepolymer.

[0036] (2) Vacuumize the above prepolymer to 5Pa, stir and react at 230°C for 6h to obtain copolyester.

[0037] Performance test conditions: with embodiment 1. The results are shown in Table 1.

Embodiment 3

[0039] (1) Under the action of ethylene glycol antimony, add 1,4-butanedioic acid, 4,4'-biphenyldimethanol and 1,4-butanediol into the reaction flask, 4,4'-biphenyl dimethanol and 1,4-butanediol Benzyldimethanol and 1,4-butanediol, to dimethyl 1,4-succinate in a molar ratio of 3:1,4,4'-biphenyldimethanol and 1,4-butanediol in molar ratio The ratio is 0.26:1. Ethylene glycol antimony accounted for 0.3% of the mass percentage of 1,4-succinic acid, under the protection of nitrogen, stirred and reacted at 190° C. for 4 hours to form a prepolymer.

[0040] (2) Vacuumize the above prepolymer to 5Pa, stir and react at 250°C for 3h to obtain copolyester.

[0041] Performance test conditions: with embodiment 1. The results are shown in Table 1.

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Abstract

The invention provides bio-based copolyester as well as a preparation method and application thereof. The bio-based copolyester comprises structural units represented by a formula (1) and a formula (2); a biphenyl structure is introduced into the structure, and two benzene ring structures of biphenyl not only can improve the glass transition temperature, but also can destroy the regularity of a PBS chain, so that the crystallinity of PBS is reduced, and the toughness is improved. In addition, the biphenyl structure is higher in rigidity and is not beneficial to molecular chain movement, and the barrier property can be improved. A biphenyl structure is introduced by a raw material monomer 4,4'-biphenyl dimethyl carbinol, and the 4,4'-biphenyl dimethyl carbinol is a bio-based monomer and can be obtained by converting 5-hydroxymethyl furfural obtained from a biomass resource.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a bio-based copolyester and its preparation method and application. Background technique [0002] Due to the shortage of petroleum resources and environmental pollution, bio-based polyester has become a research hotspot. Various bio-based polyesters are synthesized in large quantities. For example, polylactic acid, polybutylene succinate, polyhydroxyalkanoate. [0003] Among various bio-based polyesters, polybutylene succinate, referred to as PBS, has a melting point of 110-120, has good biodegradability, and can be completely biodegraded. The main chain is an aliphatic structure, and the chain segment Easy to move, has fast crystallization ability. However, its general toughness, poor barrier properties, and poor UV resistance limit its wider application. [0004] At present, although terephthalic acid-modified PBS copolyester PBST is completely biodegr...

Claims

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Application Information

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IPC IPC(8): C08G63/193C08G63/78
CPCC08G63/193C08G63/78
Inventor 王国强
Owner JILIN JIANZHU UNIVERSITY
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