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Preparing method of branched biodegradable polyester

A technology for biodegrading polyesters and compounds, applied in the field of polymers, can solve the problems of accelerating the aging speed of polyester materials, generating carboxyl groups, shortening the service life of polyester materials, etc., achieving low content of carboxyl groups and inhibiting the generation of carboxyl groups , Enhance the effect of melt strength

Active Publication Date: 2019-08-09
惠通北工生物科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above method improves the anisotropy of the film, in the synthesis process of polyester materials, it is inevitable to produce terminal carboxyl groups
Too high content of terminal carboxyl groups will accelerate the aging speed of polyester materials and shorten the service life of polyester materials

Method used

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  • Preparing method of branched biodegradable polyester
  • Preparing method of branched biodegradable polyester
  • Preparing method of branched biodegradable polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 18kg of 1,4-butanediol, 149g of triethanolamine, 7.47kg of terephthalic acid, 8.03kg of adipic acid, and 104.5g of germanium-based composite homogeneous catalysts into the reactor in sequence, stir and heat up to 220°C, and react for 1h Finally, add 45.2g of trimethylolpropane-tris[3-(2-methylaziridinyl)]propionate, continue the reaction for 1.5h, then raise the temperature to 240°C, vacuumize to 30-80Pa, polycondensation reaction After 1.5 hours, a branched biodegradable polyester with a b value of 5, a carboxyl-terminal content of 22 mmol / kg and a molecular weight of 145,000 was obtained.

Embodiment 2

[0036] Add 9.9kg of 1,4-butanediol, 14.9g of triethanolamine, 6.64kg of terephthalic acid, 7.08kg of succinic acid, and 9.6g of germanium-based composite homogeneous catalysts to the reactor in sequence, and stir to raise the temperature to 220°C. After reacting for 2 hours, add 427.5g of pentaerythritol tris(3-aziridinyl) propionate, continue the reaction for 1 hour, then raise the temperature to 240°C, vacuumize to 30-80Pa, and polycondense for 2 hours to obtain branched biodegradable polyester , the b value is 6, the carboxyl-terminal content is 11 mmol / kg, and the molecular weight is 139,000.

Embodiment 3

[0040]Add 13.5kg of 1,3-butanediol, 74.5g of triethanolamine, 8.3kg of terephthalic acid, 7.3kg of adipic acid, and 63g of germanium-based composite homogeneous catalysts to the reactor in sequence, and stir to raise the temperature to 220°C. After 2h, add 212.8g of trimethylolpropane-tris(3-aziridinyl)propionate, continue the reaction for 1h, then raise the temperature to 240°C, vacuumize to 30-80Pa, polycondense for 2h, and obtain branched Biodegradable polyester with a b value of 6, a carboxyl-terminal content of 17 mmol / kg, and a molecular weight of 150,000.

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Abstract

The invention belongs to the technical field of macromolecules, and particularly relates to a preparing method of branched biodegradable polyester. The preparing method includes the steps of conducting esterification reaction on dihydric alcohol, a branching aid, aromatic dibasic acid and aliphatic dibasic acid, adding a three-functional-group aziridine group compound after the reaction ends, andfinally conducting condensation polymerization to obtain the branched biodegradable polyester. The branched structure is introduced to polyester molecules sequentially through triethanolamine and thethree-functional-group aziridine group compound; meanwhile, since a tertiary amine structure is formed by triethanolamine and a secondary amine structure is formed by the three-functional-group aziridine group compound, a terminal carboxyl group can be restrained, and the content of the terminal carboxyl group of the material is remarkably reduced. The obtained branched biodegradable polyester ishigh in melt strength and excellent in anti-ageing performance, and the longitudinal and transverse difference between tensile strength and right-angle tearing strength is small.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to a preparation method of branched biodegradable polyester. Background technique [0002] At present, the main cause of "white pollution" is film products, because this product has a wide range of uses and is difficult to recycle. If film products are not biodegradable, they will cause environmental pollution. Aliphatic-aromatic copolyester materials have good toughness and are suitable for making flexible film products. At the same time, the aliphatic-aromatic copolyester material combines the biodegradability of aliphatic polyester and the strength of aromatic polyester, and is one of the most effective materials to solve "white pollution". In recent years, aliphatic-aromatic copolyester materials have received extensive attention and research at home and abroad. [0003] For film products, whether it is blown film or cast film, we all hope that the transver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/86
CPCC08G63/6854C08G63/863C08G2230/00
Inventor 庞买只
Owner 惠通北工生物科技(北京)有限公司
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