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Antimony catalyst-free alkali-soluble copolyester continuously polymerizing method

A polymerization method and an alkali-soluble technology, which is applied in the field of continuous polymerization of alkali-soluble copolyesters, can solve the problems of prolonging the service life of the spinneret assembly, pollution, and short service life of the spinneret assembly, so as to reduce self-polymerization and etherification reactions , easy to dissolve, the effect of solving antimony pollution

Inactive Publication Date: 2019-03-19
ZHEJIANG HENGYI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention provides a continuous polymerization method of alkali-soluble copolyester without antimony catalyst, the present invention does not add antimony catalyst in the preparation process of alkali-soluble copolyester, and solves the technical problem of antimony pollution , more environmentally friendly
Simultaneously, in order to solve the technical problem of the short service life of the spinneret assembly when the existing alkali-soluble polyester is spun into slices, the present invention adds the copolymerization component bishydroxyethyl isophthalate-5-alkali sulfonate during beating Salt, achieve dilution effect, reduce self-polymerization and etherification reaction, good spinnability, can effectively prolong the service life of spinneret components

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] Add 1 part of 5-sodium sulfoisophthalate and 5 parts of ethylene glycol into the reaction kettle, heat and stir with a heat medium, control the temperature at 180°C, and remove the generated water in time through a rectification tower. After reacting for 3 hours, prepare Sodium bishydroxyethyl isophthalate-5-sulfonate.

[0045] The process of producing alkali-soluble polyester on the continuous polymerization device of 750kg / hr melt amount: ethylene glycol, purified terephthalic acid and bishydroxyethyl isophthalate-5-sodium sulfonate are pressed 1.1: 1: The molar ratio of 0.025 is added to the slurry mixing tank to prepare slurry at a flow rate of 949.1kg / hr, and sodium acetate / ethylene glycol solution is added at a ratio of 80ppm Na at the same time. Esterification Second Reactor. In an esterification reactor, the temperature is controlled at 250° C., the pressure is at 60 kPa, and the esterification rate is controlled at 92%. In the second esterification reactor, i...

Embodiment 2

[0047] Change the consumption of the titanium-containing catalyst in embodiment 1 to 2ppm, and other conditions are identical with embodiment 1.

Embodiment 3

[0049] Change the consumption of the titanium-containing catalyst in embodiment 1 into 6ppm, and other conditions are identical with embodiment 1.

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Abstract

The invention relates to the field of polyester synthesis and discloses an antimony catalyst-free alkali-soluble copolyester continuously polymerizing method. The antimony catalyst-free alkali-solublecopolyester continuously polymerizing method is applied to continuous polymerization of raw materials of terephthalic acid, ethylene glycol, alkali metal 5-sulfoisophthalate and polyalkylene glycol with existence of titanium-containing catalysts and stabilizer. The antimony catalyst-free alkali-soluble copolyester continuously polymerizing method involves no antinomy catalyst adding during preparation of alkali-soluble copolyester, thereby solving the technical problem of antimony pollution and being more environmentally friendly; meanwhile, for solving the technical problem of short application cycle of a spinning module during chip spinning of existing alkali-soluble copolyesters, the antimony catalyst-free alkali-soluble copolyester continuously polymerizing method introduces the copolymerization components of bishydroxyethyl isophthalate-5-sulfoisophthalic acid alkali metal salt to a pulping process to achieve dilution effects and reduce auto-polymerization and etherification, thereby being good in spinnability and effectively prolong the application cycle of the spinning module.

Description

technical field [0001] The invention relates to the field of polyester synthesis, in particular to a continuous polymerization method of an alkali-soluble copolyester without an antimony catalyst. Background technique [0002] Polyester is mainly used in the production of polyester fiber (polyester), but also in non-fiber fields, including: film, plastic, packaging, etc. Polyester fiber is the largest variety in synthetic fibers. Alkali-soluble polyester (COPET) refers to a new type of polyester that can be successfully dissolved in lye with a certain concentration and temperature. The alkali-soluble polyester currently produced is mainly used in the production of composite sea-island superfine fibers, and other applications in microporous, dry fibers, improved dyed fibers, and alkali reduction treatment of fabrics. [0003] At present, antimony-based catalysts are mainly used in the industrial production of alkali-soluble polyester. However, the heavy metal antimony will...

Claims

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Application Information

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IPC IPC(8): C08G63/85C08G63/688C08G63/672D01F6/84
CPCC08G63/672C08G63/6886C08G63/85D01F6/84
Inventor 娄佳惠
Owner ZHEJIANG HENGYI PETROCHEM
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