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A kind of preparation method of high flow hydrophilic copolyester

A copolyester, high-flow technology, applied in the field of polyester, can solve the problems of polymerization stability and reduced spinning performance, and achieve the effects of improving melt quality, reducing thermal degradation process, and reducing flow temperature.

Active Publication Date: 2018-07-24
JIANGSU DESAI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, when the copolymerization modifying monomer or component is introduced into the polyester, on the one hand, it will affect the polymerization stability; Degradation factors lead to greatly reduced spinning performance

Method used

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  • A kind of preparation method of high flow hydrophilic copolyester

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Effect test

Embodiment 1

[0059] A method for preparing a high-fluid hydrophilic copolyester, comprising polyester esterification, modified component Tween / glycol beating, transesterification, and polycondensation in sequence, and the specific steps are:

[0060] (1) polyester esterification reaction:

[0061] Prepare terephthalic acid and ethylene glycol into a slurry at a molar ratio of 1:1.1, and add a certain mass fraction of anti-ether agent, thermal stability, and antioxidant. The esterification reaction is completed at a certain temperature and pressure in the esterification reactor, and the water output is used as the technical basis for the reaction conversion rate at the end of the esterification;

[0062] The pressure of the polyester esterification reaction is 0.01 MPa, the reaction temperature is 260° C., and the reaction time is 3 hours; when the water output of the esterification reaction reaches 95% of the theoretical water output, the esterification reaction is completed;

[0063] Bef...

Embodiment 2

[0080] A method for preparing a high-fluid hydrophilic copolyester, comprising polyester esterification, modified component Tween / glycol beating, transesterification, and polycondensation in sequence, and the specific steps are:

[0081] (1) polyester esterification reaction:

[0082] Prepare terephthalic acid and ethylene glycol into a slurry at a molar ratio of 1:1.1, and add a certain mass fraction of anti-ether agent, thermal stability, and antioxidant. The esterification reaction is completed at a certain temperature and pressure in the esterification reactor, and the water output is used as the technical basis for the reaction conversion rate at the end of the esterification;

[0083] The pressure of the polyester esterification reaction is 0.05MPa, the reaction temperature is 260°C, and the reaction time is 2.5h; when the water output of the esterification reaction reaches 95% of the theoretical water output, the esterification reaction is completed;

[0084] Before th...

Embodiment 3

[0101] A method for preparing a high-flow hydrophilic copolyester, comprising polyester esterification, modified component Tween / glycol beating, transesterification, and polycondensation in sequence, and the specific steps are:

[0102] (1) polyester esterification reaction:

[0103] Prepare terephthalic acid and ethylene glycol into a slurry at a molar ratio of 1:1.1, and add a certain mass fraction of anti-ether agent, thermal stability, and antioxidant. The esterification reaction is completed at a certain temperature and pressure in the esterification reactor, and the water output is used as the technical basis for the reaction conversion rate at the end of the esterification;

[0104] The pressure of the polyester esterification reaction is 0.05MPa, the reaction temperature is 260°C, and the reaction time is 2.5h; when the water output of the esterification reaction reaches 95% of the theoretical water output, the esterification reaction is completed;

[0105] Before the...

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Abstract

The invention relates to a method for preparing high-fluidity hydrophilic copolyester. A modified component Tween (or polysorbate, hereinafter referred to as Tween) and diol are mixed and beat in accordance with a certain mass ratio, and are added when polyester completes a esterification stage, and a certain mass of titanium transesterification catalyst is supplemented. The titanium transesterification catalyst has high catalytic activity, which can ensure the rapid and efficient transesterification reaction; the Tween and esters complete a transesterification process at lower temperature. After the transesterification reaction is completed, the high-fluidity hydrophilic copolyester is prepared by a polycondensation reaction. In a Tween molecular structure, an HO- [CH2CH2O] chain segment can be reacted with polyester ester to be connected to a polyester molecular chain; meanwhile, A aromatic ring of the polyester has large steric hindrance, and the HO-[CH2CH2O] cannot achieve all reactions, so that the generation of the side effects of branched cross-linking are avoided. The flexible hydrophilic polyester provided by the invention can be widely used for preparing a moisture absorbing and sweat releasing antistatic fiber as an intimate fabric.

Description

technical field [0001] The invention belongs to the technical field of polyester, and relates to a method for preparing a high-fluidity hydrophilic copolyester, in particular to a method for preparing a polyester with high fluidity, which reduces thermal degradation side reactions and significantly improves the hydrophilicity of the polyester. Background technique [0002] Polyester fiber is currently the most important raw material in the textile field. However, due to the regular arrangement of the molecular structure of polyester itself, high crystallinity, and large modulus, it has the problem of hard hand feeling when used as a fiber in the field of clothing, which affects its comfort; at the same time The polyester molecule lacks polar hydrophilic functional groups, and the hygroscopicity of the fiber is very poor. Under the standard environment, the moisture regain of the fiber is only 0.4%, while the moisture regain of natural fiber cotton reaches 7.5%. The hard hand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672C08G63/183C08G63/78C08G63/85
CPCC08G63/183C08G63/672C08G63/78C08G63/85
Inventor 陈仕艳吉鹏王朝生郑立康冯赛花
Owner JIANGSU DESAI CHEM FIBER
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