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Preparation method of degradable heat-resistant copolyester

A technology of copolyester and heat resistance, which is applied in the field of preparation of degradable heat-resistant copolyester, can solve the problems of poor heat resistance and low mechanical strength, and achieve improved thermodynamic performance, high mechanical strength and heat resistance Improved effect

Active Publication Date: 2021-01-29
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor heat resistance and low mechanical strength in the preparation of PBSeT in the prior art, the present invention provides a preparation method of degradable heat-resistant copolyester

Method used

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  • Preparation method of degradable heat-resistant copolyester
  • Preparation method of degradable heat-resistant copolyester

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (a) Put 1.5kgBDO, 976gTPA, and 791gSeA into the reaction kettle, mix evenly under the stirring of a low-speed motor, then add a titanium-based catalyst at a temperature of 210 °C, and carry out esterification at normal pressure, and the fraction collected after the reaction reaches the theoretical value or is greater than the theoretical value , can start to enter the polycondensation stage.

[0026] (b) The temperature rises to 240 ° C, and the vacuum pump is turned on to slowly reduce the vacuum degree of the system to about 700 Pa, and the polycondensation catalyst is added to observe the change of the motor torque value. The polycondensation is completed when the torque reaches a maximum value and remains constant. The pure material PBSeT was obtained. Nitrogen protection discharges the material, obtains the sample after water-cooling granulation and drying.

Embodiment 2

[0028] (a) Put 1.5kgBDO, 976gTPA, and 791gSeA into the reaction kettle, mix evenly under the stirring of a low-speed motor, then add a titanium-based catalyst at a temperature of 220°C, and carry out esterification at normal pressure, and the fraction collected after the reaction reaches the theoretical value or is greater than the theoretical value , can start to enter the polycondensation stage.

[0029] (b) The temperature rises to 240°C, and the vacuum pump is turned on to slowly reduce the vacuum degree of the system to about 700Pa, then a polycondensation catalyst is added, and the torque value of the motor is observed. The polycondensation is completed when the torque reaches a maximum value and remains constant. The vacuum of the system was stopped, and nitrogen gas was blown in to cool down. When the temperature drops to 180-200°C, add PLA to melt, and the mass ratio of PLA to PBSeT is 2:8. Then add the chain extender hexamethylene diisocyanate HDI dropwise, n(NCO):...

Embodiment 3

[0031] (a) Put 1.5kgBDO, 976gTPA, and 791gSeA into the reaction kettle, mix evenly under the stirring of a low-speed motor, then add a titanium-based catalyst at a temperature of 220°C, and carry out esterification at normal pressure, and the fraction collected after the reaction reaches the theoretical value or is greater than the theoretical value , can start to enter the polycondensation stage.

[0032] (b) The temperature rises to 250°C, and the vacuum pump is turned on to slowly reduce the vacuum degree of the system to about 700Pa. Add a polycondensation catalyst and observe the change of the motor torque value. The polycondensation is completed when the torque reaches a maximum value and remains constant. The vacuum of the system was stopped, and nitrogen gas was blown in to cool down. When the temperature drops to 180-200°C, add PLA to melt, the mass ratio of PLA to PBSeT is 2:8, and then start to drop the chain extender hexamethylene diisocyanate HDI, n(NCO):n(OH) is...

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Abstract

The invention relates to the field of high polymer material synthesis, in particular to a preparation method of degradable heat-resistant copolyester. The method comprises the following steps: addingterephthalic acid, sebacic acid, 1, 4-butanediol and an esterification catalyst into a reaction kettle for esterification reaction, entering a polycondensation stage after the reaction reaches an esterification end point, adding the polycondensation catalyst, heating while reducing the vacuum degree of a system, reacting until the torque of a motor does not rise to the polycondensation end point,stopping the vacuum of the system, and blowing nitrogen for cooling, then adding polylactic acid, melting, then starting to dropwise add a chain extender hexamethylene diisocyanate, and carrying out chain extension to the maximum value of the motor torque, thus obtaining the block degradable heat-resistant copolyester PBSeT-HDI-PLA. According to the invention, PBSeT is used as a matrix, and the heat resistance of a sample is controllably adjusted by changing the mass ratio of PBSeT to PLA and the content of a chain extender. While the biodegradability is ensured, the thermodynamic property ofthe product is improved, and the mechanical strength of the product is high. The vicat softening point is increased by 16 DEG C compared with the vicat softening point before modification, and the heat resistance is greatly improved.

Description

technical field [0001] The invention relates to the field of polymer material synthesis, in particular to a preparation method of degradable heat-resistant copolyester. Background technique [0002] Polylactic acid (PLA), also known as polylactide, is a thermoplastic aliphatic polyester derived from renewable sources, usually from fermented vegetable starches such as corn, cassava, sugarcane or sugar beet pulp. In 2010, PLA was the second most consumed biomass plastic in the world. [0003] Aliphatic-aromatic copolyester PBSeT is a copolymer of polybutylene sebacate and polybutylene terephthalate, which has the characteristics of both PBSe and PBT, and has good ductility and elongation at break. It also has good heat resistance and impact performance. is the hotspot of current research. And the raw material sebacic acid used can be obtained by cracking castor oil, which is a kind of bio-based material. Butanediol can also be produced biologically. In today's serious whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/91
CPCC08G63/183C08G63/916C08G63/78Y02W90/10
Inventor 李迎春安超王文生畅贝哲李萍董星张艺玮
Owner ZHONGBEI UNIV
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