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Low-viscosity polyester and its preparation method

A technology for sticking polyester and polyester, applied in the field of low-viscosity polyester and its preparation, can solve the problem of high oligomer content, achieve uniform molecular chain length, small difference in molecular chain length, and avoid increased oligomer content Effect

Active Publication Date: 2020-09-04
ZHEJIANG UNIFULL IND FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of low-viscosity polyester that can effectively reduce the content of oligomers in the polyester in order to overcome the problem that the oligomer, especially the cyclic oligomer content is higher in the low-viscosity polyester of the prior art. and its preparation method

Method used

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  • Low-viscosity polyester and its preparation method
  • Low-viscosity polyester and its preparation method
  • Low-viscosity polyester and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of low-viscosity polyester, concrete steps are as follows:

[0037] (1) Modulation of ethylene glycol antimony;

[0038] Mix evenly with ethylene glycol in the catalyst preparation tank 1, and circulate nitrogen with a water content of 155ppm during the mixing process; the catalyst configuration system diagram is as follows figure 2 As shown, the catalyst configuration system includes a catalyst preparation tank 1 and a catalyst supply tank 4. The inside of the catalyst preparation tank 1 is provided with an agitator, and the top and bottom are respectively connected with the outlet of the nitrogen treatment generator 2 and the gas circulation pump 3. 2 is used to generate nitrogen and dry nitrogen at the same time. The nitrogen treatment generator 2 is connected to the inlet of the gas circulation pump 3; after the modulation process is completed, ethylene glycol antimony and ethylene glycol enter the catalyst supply tank 4 after passing through...

Embodiment 2

[0051] The preparation method of low-viscosity polyester, concrete steps are as follows:

[0052] (1) Modulation of ethylene glycol antimony;

[0053] Antimony ethylene glycol and ethylene glycol are mixed evenly in the catalyst preparation tank, wherein, in the mixing process, helium with a water content of 190ppm is circulated, and the configuration system of the catalyst is basically the same as that of Example 1, except that The device used to generate gas while drying the gas is a helium gas treatment generator;

[0054] (2) Carry out esterification reaction and polycondensation reaction between terephthalic acid and ethylene glycol with a molar ratio of 1:1.3, and add ethylene glycol antimony when the average degree of polymerization of the intermediate product of the polycondensation reaction reaches 8, and finally obtain low Sticky polyester, wherein the temperature of esterification reaction is 238°C, the time is 2h, and the pressure is 0.MPa; the temperature of poly...

Embodiment 3

[0062] The preparation method of low-viscosity polyester, concrete steps are as follows:

[0063] (1) Modulation of ethylene glycol antimony;

[0064] Ethylene glycol antimony and ethylene glycol are mixed evenly in the catalyst preparation tank, wherein, in the mixing process, the neon gas with a water content of 185ppm is circulated, and the configuration system of the catalyst is basically the same as that of Example 1, the difference is that The device used to generate gas while drying the gas is a neon gas treatment generator;

[0065] (2) Carry out esterification reaction and polycondensation reaction between terephthalic acid and ethylene glycol with a molar ratio of 1:1.4, and add ethylene glycol antimony when the average degree of polymerization of the intermediate product of the polycondensation reaction reaches 13, and finally obtain low Viscose polyester, wherein the temperature of the esterification reaction is 235°C, the time is 3h, and the pressure is 0.2MPa; t...

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Abstract

The invention relates to a low-viscosity polyester and a preparation method thereof. The low-viscosity polyester with an intrinsic viscosity of 0.300 to 0.500 dL / g is prepared by controlling the adding time of a catalyst in a synthesis process, wherein the catalyst is added when the average polymerization degree of an intermediate product of a polycondensation reaction reaches 8 to 17; wherein thepolycondensation reaction temperature is 260 to 273 DEG C; the catalyst is ethylene glycol antimony; the modulation process of ethylene glycol antimony comprises the following steps: uniformly mixingethylene glycol antimony and ethylene glycol; circularly introducing nitrogen or inert gas with water content less than 200ppm in the mixing process, wherein the content of a cyclic oligomer in the prepared low-viscosity polyester is less than 2 percent by weight. According to the low-viscosity polyester and the preparation method thereof disclosed by the invention, the content of the oligomer inthe product is lowered by controlling the adding time of the catalyst in the synthesis process, the polycondensation reaction temperature and the modulation process of ethylene glycol antimony addedin the synthesis process, and the prepared low-viscosity polyester has high quality and excellent popularization value.

Description

technical field [0001] The invention belongs to the field of polyester preparation, and relates to a low-viscosity polyester and a preparation method thereof. Background technique [0002] High-viscosity polyester has good mechanical properties and excellent physical and chemical properties, and is widely used in industrial fields such as industrial yarns, packaging materials, and engineering plastics, especially in industrial fields that require composite reinforcement materials such as automobiles, safety protection, and ropes. In the above-mentioned polyester application field, in order to ensure the high performance of the product, people need to further reduce the oligomer content in the polyester chip, especially when preparing polyester with higher intrinsic viscosity, the oligomer content in the polyester has already been reduced. Become one of the key parameters to measure the quality of products. Cyclic oligomers have the most content in oligomers, so how to effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/86C08G63/78
CPCC08G63/183C08G63/78C08G63/866
Inventor 姬洪宋明根张永久于贺喜张玉梅陈康邹家熊甘宇
Owner ZHEJIANG UNIFULL IND FIBER
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