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Degradable polyester and preparation method and product thereof

A technology for degrading polyester and esterified products, applied in the field of materials, can solve problems such as threats to biological health and survival, human health, slow degradation rate, etc., and achieve the effects of easy implementation, solution to marine plastic pollution, and simple operation

Pending Publication Date: 2021-07-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the research on the degradation of degradable polymers is mostly concentrated in the terrestrial environment, resulting in polyesters that can degrade quickly under soil or compost conditions, such as polylactic acid, polybutylene succinate adipate, polyhexamethylene Lactones, etc., degrade very slowly in rivers, lakes, oceans and other water environments, especially in marine environments, where the degradation time is long
Furthermore, plastic waste existing in water environments such as rivers, lakes, and oceans not only seriously threatens the health and survival of organisms in the water environment, but also microplastics will eventually enter the human body through the food chain, eventually threatening human health

Method used

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  • Degradable polyester and preparation method and product thereof
  • Degradable polyester and preparation method and product thereof

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preparation example Construction

[0041] The present invention also provides a kind of preparation method of described degradable polyester, comprising:

[0042] S1, mixing diglycolic acid, dibasic acid or its esterified product, aliphatic dihydric alcohol and an esterification catalyst, and performing an esterification reaction to obtain an esterification product;

[0043] S2, performing a polycondensation reaction on the esterified product to obtain a degradable polyester.

[0044] The reaction equation of the preparation method is as follows:

[0045]

[0046] Wherein, in order to ensure the carrying out of the esterification reaction, in step S1, the molar ratio of the sum of the molar weights of the diglycolic acid and the dibasic acid or its esterified product to the aliphatic glycol is 1:1.6 -1:1.1, the molar ratio of the diglycolic acid to the dibasic acid or its esterified product is 0.1:1-10:1, more preferably 0.1:1-2:1, more preferably 0.1:1 -1.5:1, so that the obtained degradable polyester has b...

Embodiment 1

[0065] Take respectively 29.1g (0.15mol) of dimethyl terephthalate, 20.1g (0.15mol) of diglycolic acid, 40.6g (0.45mol) of 1,4-butanediol and 0.2% of the total mass of raw materials Antimony glycol, placed in a reactor, and mechanically stirred and blended at 170°C-190°C under the protection of high-purity nitrogen, reacted for 5 hours to obtain an esterified product.

[0066] Add 0.2% antimony trioxide, 0.4% triphenyl phosphate and 0.6% antioxidant 1076 to the above-mentioned esterification product, mechanically stir and blend, and carry out polycondensation reaction. The reaction temperature of polycondensation reaction is 200°C-240°C, the vacuum degree of the reaction system gradually drops below 200Pa, and the reaction ends after 7 hours. Under the protection of high-purity nitrogen, the temperature of the reactor is gradually lowered to room temperature, and a colorless or light yellow solid product is obtained, namely For degradable polyester, the structural formula is a...

Embodiment 2

[0076] Take 34.2g (0.225mol) of 2,5-furandicarboxylic acid, 20.1g (0.15mol) of diglycolic acid, 27.04g (0.3mol) of 1,4-butanediol, 9.31g (0.15mol) of ethylene glycol Diol and dibutyltin oxide with a total mass of 0.2% were placed in a reactor, and mechanically stirred and blended at 180°C-190°C under the protection of high-purity nitrogen, and the esterification product was obtained after 6 hours of reaction.

[0077] Add 0.2% of tetrabutyl titanate, 0.1% of antimony trioxide, 0.5% of diphenyl phosphate and 0.5% of antioxidant 168 into the above esterification product, mechanically stir and blend, and carry out Polycondensation reaction, the reaction temperature of polycondensation reaction is 210°C-240°C, the vacuum degree of the reaction system gradually drops below 200Pa, and the reaction ends after 8 hours. Under the protection of high-purity nitrogen, the temperature of the reactor is gradually lowered to room temperature, and no Color or light yellow solid product is deg...

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Abstract

The invention relates to a degradable polyester and a preparation method thereof, the structural formula of the copolyester is as shown in formula (1), in the formula, R1 is a structural unit of aliphatic dihydric alcohol, R2 is a structural unit of binary acid or ester thereof, x and y are integers, and x: y = 10: 1-1: 10. The invention also relates to a product made of the degradable polyester. The degradable polyester disclosed by the invention can be quickly degraded in both land environment and water environment, so that the product prepared from the degradable polyester can effectively solve the problem of plastic pollution, and particularly can effectively solve the problem of marine plastic pollution.

Description

technical field [0001] The invention relates to the field of material technology, in particular to degradable polyester, its preparation method and products. Background technique [0002] At present, the research on the degradation of degradable polymers is mostly concentrated in the terrestrial environment, resulting in polyesters that can degrade quickly under soil or compost conditions, such as polylactic acid, polybutylene succinate adipate, polyhexamethylene Lactones, etc., degrade very slowly in rivers, lakes, oceans and other water environments, especially in marine environments, where the degradation time is long. Furthermore, plastic waste existing in water environments such as rivers, lakes, and oceans not only seriously threatens the health and survival of organisms in the water environment, but also microplastics will eventually enter the human body through the food chain, eventually threatening human health. Contents of the invention [0003] Based on this, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08J5/18C08L67/02
CPCC08G63/672C08J5/18C08J2367/02
Inventor 田莹张若愚胡晗王静刚朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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