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A continuous preparing method for polyether modified copolyester

A technology of polyether modification and copolyester, which is applied in the direction of single-component copolyester rayon, etc., can solve the problems of polyether macromolecule decomposition, achieve stable molecular weight, reduce the possibility of decomposition, and speed up the reaction speed Effect

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to overcome the problem of the decomposition of polyether macromolecules during the polyester modification process, the invention provides a continuous preparation method for polyether modified copolyesters to obtain modified polyesters with uniform polyether distribution and stable molecular weight.

Method used

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  • A continuous preparing method for polyether modified copolyester
  • A continuous preparing method for polyether modified copolyester
  • A continuous preparing method for polyether modified copolyester

Examples

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Embodiment

[0043] The raw materials terephthalic acid and ethylene glycol are added into the beating tank according to the proportioning ratio, and are beaten under stirring; after the titanium series catalyst (titanium glycolate) enters the preparation area, ethylene glycol is added to dilute the catalyst concentration to 0.04wt%. After the preparation is completed, it is transported to the slurry preparation tank to participate in the preparation of the slurry.

[0044] The slurry is sent quantitatively and continuously into the horizontal agitated esterification reaction kettle with a gear pump, and is stirred at a gauge pressure of 0.08MPa and a temperature of 260°C for esterification to generate an intermediate bishydroxyethyl terephthalate, which is reacted until esterification The rate is at least 92%. The water generated in the esterification process is distilled out with the ethylene glycol. After the water is separated by the fractionating tower, 99wt% of the ethylene glycol is ...

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Abstract

The invention relates to a continuous preparing method for polyether modified copolyester. The method includes mixing an ethylene glycol solution of a titanium catalyst, terephthalic acid and ethylene glycol to prepare slurry, esterifying, mixing an ethylene glycol solution of an antimony catalyst, an ethylene glycol solution of polyether and an intermediate that is bis(hydroxyethyl) terephthalate, pre-polymerizing, performing condensation polymerization, and the like. Problems that polyether macromolecules are prone to thermal degradation and are degraded into chain segments with low molecular weights at high temperature with long reaction time, and modification effects of the chain segments with low molecular weights on polyesters are weakened are overcome by the preparing method. The polyether that is a modifying agent in the prepared polyether modified copolyester is uniform in distribution and stable in molecular weight. A copolyester product is excellent and stable in performance and good in spinnability.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular, the invention relates to a preparation method of modified polyester. Background technique [0002] Polyester (polyethylene terephthalate, PET) is polymerized from terephthalic acid (PTA) and ethylene glycol (EG), although it has excellent processing properties, mechanical properties, chemical properties, etc., it is used It is constantly expanding, but the polyester molecular chains are closely gathered, the degree of crystallinity and orientation is high, the polarity is small, the lack of hydrophilicity, and the hygroscopicity are poor, which limits its use in fields that require high hygroscopicity or water absorption. in the application. [0003] Take polyester fiber as an example. As the chemical fiber with the largest output at home and abroad, it has easy-to-wash, quick-drying, and crisp wearing properties. However, polyester fiber has poor hygroscopicity. When wearing poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/85C08G63/86D01F6/84
Inventor 沈伟朱刚张晓静任明利周向群董艳金永龙
Owner CHINA PETROLEUM & CHEM CORP
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