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Continuous preparation method of biodegradable block co-polyester and biodegradable block co-polyester

A block copolyester, biological technology, applied in the field of biodegradable block copolyester, can solve the problem of poor thermal performance and physical processing performance of degradable polymers, difficulty in continuous production, and ethylene glycol recycling rate Bad question

Pending Publication Date: 2021-05-04
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problems of poor thermal performance and physical processing performance of existing degradable polymers, easy generation of tetrahydrofuran during the preparation process, poor recycling rate of ethylene glycol, and difficulty in realizing continuous production. Provide a continuous preparation method of biodegradable block copolyesters and biodegradable block copolyesters, so that the preparation process of degradable polymers is continuous, and no tetrahydrofuran is produced, and the recycling rate of ethylene glycol is high. The prepared polymer has good thermal properties and physical processing properties

Method used

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  • Continuous preparation method of biodegradable block co-polyester and biodegradable block co-polyester

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Prepare terephthalic acid, succinic acid, and ethylene glycol into a slurry, and the molar ratio of terephthalic acid, succinic acid, and ethylene glycol in the slurry is: 1:0.2:1.5.

[0043] (2) The slurry prepared in the step (1) is continuously fed into an esterification tank, and esterified at a temperature of 220° C. to form a polyester prepolymer.

[0044] (3) Inject the polyester prepolymer into the precondensation system, and complete the polycondensation at 250°C to obtain a polyester prepolymer melt with an intrinsic viscosity of 0.3dL / g, which is measured by a melt metering gear pump from the precondensation system. The polycondensation system is delivered to the prepolymer melt pipeline.

[0045] (4) Melt polybutylene succinate with an intrinsic viscosity of 1.0dL / g and lanthanum acetate transesterification catalyst through a screw extruder to form a mixed melt of polybutylene succinate, polybutylene succinate The acid butylene glycol ester mixed melt is ...

Embodiment 2

[0049] (1) Prepare terephthalic acid, oxalic acid, and ethylene glycol into a slurry, and the molar ratio of terephthalic acid, oxalic acid, and ethylene glycol in the slurry is: 1:0.42:2.0.

[0050] (2) The slurry prepared in step (1) is continuously fed into an esterification tank, and esterified at a temperature of 200° C. to form a polyester prepolymer.

[0051] (3) Inject the polyester prepolymer into the precondensation system, and complete the polycondensation at 240°C to obtain a polyester prepolymer melt with an intrinsic viscosity of 0.1dL / g, which is measured by the melt metering gear pump from the precondensation system. The polycondensation system is delivered to the prepolymer melt pipeline.

[0052] (4) Melt the polybutylene succinate with an intrinsic viscosity of 0.5dL / g and the cerium propionate transesterification catalyst through a screw extruder to form a mixed melt of polybutylene succinate, polybutylene succinate The mixed melt of butanediol dioate is m...

Embodiment 3

[0056] (1) Prepare terephthalic acid, sebacic acid, and ethylene glycol into a slurry, and the molar ratio of terephthalic acid, sebacic acid, and ethylene glycol in the slurry is: 1:0.3:1.6.

[0057] (2) The slurry prepared in the step (1) is continuously fed into an esterification tank, and esterified at a temperature of 230° C. to form a polyester prepolymer.

[0058] (3) Inject the polyester prepolymer into the precondensation system, and complete the polycondensation at 260°C to obtain a polyester prepolymer melt with an intrinsic viscosity of 0.4dL / g, which is measured by a melt metering gear pump from the precondensation system. The polycondensation system is delivered to the prepolymer melt pipeline.

[0059] (4) Melt the polybutylene succinate with an intrinsic viscosity of 1.5dL / g and the lanthanum acetate transesterification catalyst through a screw extruder to form a mixed melt of polybutylene succinate, polybutylene succinate The acid butylene glycol ester mixed ...

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Abstract

The invention discloses a continuous preparation method of biodegradable block co-polyester and biodegradable block co-polyester. The preparation method comprises the following steps: preparing terephthalic acid, aliphatic dibasic acid and ethylene glycol into slurry, carrying out esterification and polycondensation to obtain a polyester prepolymer melt, melting poly(butylene succinate) and a transesterification catalyst to obtain a poly(butylene succinate) mixed melt, converging the polyester prepolymer melt and the poly(butylene succinate) mixed melt, conveying to a final polycondensation reaction system, and carrying out final polycondensation reaction to obtain a biodegradable block co-polyester melt; and subjecting the biodegradable block co-polyester melt to forming, crystallization and grain-sized dicing to obtain the biodegradable block co-polyester crystal slice. The preparation method disclosed by the invention can be continuously carried out, tetrahydrofuran is not generated in the preparation process, the recycling rate of ethylene glycol is improved, and the prepared co-polyester is good in thermal property and physical processing properties.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a method for continuously preparing biodegradable block copolyesters and the biodegradable block copolyesters. Background technique [0002] With the increasingly serious problem of environmental pollution, biodegradable polymers have attracted more and more attention. Currently, most biodegradable materials are aliphatic polyesters. The application of aliphatic polyesters in industrial and agricultural fields is greatly limited due to their poor thermal and physical processing properties. [0003] In recent years, some researchers have focused on the synthesis of copolyesters via aliphatic and aromatic units in order to obtain low-cost biodegradable polymers with both satisfactory thermal and physical processing properties and biodegradability. Research. [0004] Among them, polyethylene terephthalate (PET) is a very important thermoplastic with a wide rang...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/199C08G63/84
CPCC08G63/183C08G63/84C08G63/199
Inventor 邱志成刘涛李鑫王颖王雪
Owner CHINESE TEXTILE ACAD
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