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Manufacturing method of low-melting-point polyester chip

A technology of low melting point polyester and manufacturing method, applied in the field of polymer synthetic materials, can solve the problems of product spinnability and poor thermal stability, and achieve the effect of breaking through the production bottleneck, good spinnability and stable performance

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still many problems in the industrialized production of low-melting point polyester, and there are shortcomings such as poor spinnability and thermal stability of the product.

Method used

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  • Manufacturing method of low-melting-point polyester chip
  • Manufacturing method of low-melting-point polyester chip
  • Manufacturing method of low-melting-point polyester chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] EXAMPLES Low melting point polyester chips will be prepared by the following steps:

[0061] (1) Stir terephthalic acid (PTA), isophthalic acid (PIA), ethylene glycol (EG), cobalt acetate and titanium-based catalyst ethylene glycol solution evenly, and configure it into a slurry, wherein: PTA and PIA The mass ratio ranges from 15:85 to 85:15; the molar ratio of PTA+PIA to EG ranges from 1: (0.9 to 1.7); the content of cobalt acetate is 2 to 20 ppm; the content of titanium atoms in the titanium catalyst is 0.02 to 0.5 ppm ; The concentration of the titanium-based catalyst in ethylene glycol solution is 1 to 6 wt %;

[0062] (2) Pour the slurry obtained in step (1) into the first esterification reaction kettle, and carry out the first step esterification reaction at a temperature of 250-285°C and a gauge pressure of 0.05-0.11MPa. The first esterification Terminate when the esterification rate of the compound reaches 90% or above;

[0063] (3) Put the first esterified pr...

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Abstract

The invention provides a manufacturing method of a low-melting-point polyester chip. According to the invention, production research is carried out on a five-kettle process flow; a unique process formula and a process package are adopted; the reaction polymerization degree of each reaction kettle is subjected to echelon distribution; the low-melting-point polyester chip production method can solvethe industrial mass production problem of low-melting-point polyester, the produced low-melting-point polyester chip has the advantages of being high in cleanliness, good in spinnability, good in thermal stability and the like, meanwhile, production of low-melting-point polyester chips with different melting points can be conducted on the same production line according to actual production requirements, and production of serialized low-melting-point polyester chips is achieved.

Description

technical field [0001] The invention relates to the field of polymer synthetic materials, and in particular to a method for manufacturing low-melting-point polyester chips. Background technique [0002] The so-called low-melting point polyester refers to a modified polyester with a lower melting point. By adding a variety of modified components in the polymerization process of ordinary polyester, the molecular structure of PET is changed, so as to achieve the purpose of lowering the melting point. It has the same or similar structural performance characteristics and good compatibility with conventional polyester. Low melting point polyester usually refers to a type of modified copolyester with a melting point of 100-210°C. [0003] Low-melting point polyester is widely used in the production of non-woven fabrics for clothing or electrical insulation non-woven fabrics. The fibers made from it are mixed in ordinary polyester fiber nets, and only need to be heated to produce a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/86C08G63/85
CPCC08G63/672C08G63/866C08G63/85
Inventor 熊伟沈伟周向群侯正均林雪梅王培明何慧吴静军任明利
Owner CHINA PETROLEUM & CHEM CORP