A kind of synthetic method of polyester resin

A synthesis method and technology of polyester resin, applied in the field of organic polymer material synthesis, can solve the problems of unstable temperature rise rate control, poor stability between batches, and unfavorable separation of alcohol and water, and achieve the target and stable performance, The effect of using performance improvement and unit consumption reduction

Active Publication Date: 2015-10-21
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are that normal pressure is not conducive to the separation of alcohol and water, the production cycle is long, the utilization rate of equipment is low, the control of heating rate is unstable, and the stability of products between batches is very poor.

Method used

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  • A kind of synthetic method of polyester resin

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Effect test

Embodiment 1

[0011] A method for synthesizing polyester resin. The steps include esterification reaction and polycondensation reaction. The esterification reaction is carried out in a primary reaction kettle, and the polycondensation reaction is carried out in a secondary reaction kettle.

[0012] The esterification reaction step is divided into a dehydration polymerization reaction and an end-capping reaction. The dehydration polymerization reaction step is: put the dibasic alcohol and the dibasic acid into the first-stage reactor, and the reaction parameters are: the reaction temperature is 230°C, and the temperature gradient is 200°C. The heating rate is 4°C / min, the heating rate is 1.5°C / 15min at 200-230°C, and the pressure is 0.25MP. Make the pressure reach the set value before reaching the reaction temperature; The target acid value is 9, and the reaction parameters are controlled by a decentralized control system (DCS); the mass ratio of dibasic alcohol and dibasic acid is 1.2:1, the...

Embodiment 2

[0016] A method for synthesizing polyester resin. The steps include esterification reaction and polycondensation reaction. The esterification reaction is carried out in a primary reaction kettle, and the polycondensation reaction is carried out in a secondary reaction kettle.

[0017] The esterification reaction step is divided into dehydration polymerization reaction and end-capping reaction. The dehydration polymerization reaction step is: put dibasic alcohol and dibasic acid into a first-stage reaction kettle, and the reaction parameters are: reaction temperature 220°C, temperature gradient before 200°C The temperature rise rate is 6°C / min, the temperature rise rate is 1.5°C / 15min at 200-220°C, and the pressure is 0.25MP. When the reaction temperature is reached, the pressure reaches the set value at the same time; the reaction is completed to reach the target acid value of the polyester resin, so The target acid value is 12, and the reaction parameters are controlled by a d...

Embodiment 3

[0021] A method for synthesizing polyester resin. The steps include esterification reaction and polycondensation reaction. The esterification reaction is carried out in a primary reaction kettle, and the polycondensation reaction is carried out in a secondary reaction kettle.

[0022] The esterification reaction step is divided into dehydration polymerization reaction and end-capping reaction. The dehydration polymerization reaction step is: put dibasic alcohol and dibasic acid into a first-stage reaction kettle, and the reaction parameters are: reaction temperature 225°C, temperature gradient before 200°C The heating rate is 5°C / min, the heating rate is 1.5°C / 15min at 200-225°C, and the pressure is 0.25MP. Make the pressure reach the set value before reaching the reaction temperature; the reaction is completed when the target acid value of the polyester resin is reached, so The target acid value is 6, and the reaction parameters are controlled by a distributed control system (...

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Abstract

The invention relates to a synthetic method of polyester resin. The synthetic method comprises esterification reaction and condensation polymerization, wherein the esterification reaction is carried out in a first level reaction kettle while the condensation polymerization is carried out in a second level reaction kettle. According to the synthetic method, by carrying out synthesis in the two reaction kettles, the production efficiency is improved and the energy consumption is reduced. The stability of the product and the operational performance of the product in the later stage are greatly enhanced due to reasonable temperature rise, pressurization and vacuum gradient.

Description

technical field [0001] The invention relates to the technical field of synthesis of organic polymer materials, in particular to a synthesis method of polyester resin. Background technique [0002] At present, the known resin production process is: reaction under normal pressure, all reactions are completed in a reactor, and the temperature rise is mostly carried out by manually adjusting the opening of the valve. The disadvantages of this process are that the normal pressure is not conducive to the separation of alcohol and water, the production cycle is long, the utilization rate of equipment is low, the heating rate control is unstable, and the stability of the product between batches is very poor. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a synthetic method of polyester resin. The synthetic method of the present invention improves production efficiency, reduces energy consumption, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 洪毅汪涛李明王伟
Owner ANHUI SHENJIAN NEW MATERIALS
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