Preparation method for copolyester containing sodium sulfonate group

A technology containing sodium sulfonate and copolyester, applied in the direction of one-component copolyester rayon, etc., can solve the problems of material entrainment, blockage of vacuum system, poor product structure regularity, and restriction of continuous production, etc. High degree of stability, excellent mechanical properties, beneficial to continuous production

Pending Publication Date: 2020-03-31
CHINESE TEXTILE ACAD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In the production process of cationic dyeable polyester, the concentration of three monomers used is generally 20%-40%, and the remaining components are ethylene glycol. The timing of adding three monomers in production is generally after the completion of esterification ( The esterification rate is more than 90%), before the pre-condensation polymerization. At this time, the addition of three monomers will cause a large amount of ethylene glycol components to enter the polycondensation system. This component is not needed in production, and a large amount of ethylene glycol During the ext

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  • Preparation method for copolyester containing sodium sulfonate group
  • Preparation method for copolyester containing sodium sulfonate group
  • Preparation method for copolyester containing sodium sulfonate group

Examples

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Example Embodiment

[0033] Example 1

[0034] The carboxylic acid to alcohol molar ratio is 1:1.25 terephthalic acid and ethylene glycol, and the catalyst and stabilizer are mixed and added to the esterification reactor for pre-esterification reaction. The catalyst is antimony trioxide and stabilizer. It is triphenyl phosphite, the temperature of pre-esterification reaction is 240-265℃;

[0035] When the esterification rate reaches 50%, add the mixture of diethylene glycol isophthalate-5-sodium sulfonate and ethylene glycol to the reaction system, and the added diethylene glycol isophthalate-5- The amount of sodium sulfonate is 1.5% of the total added terephthalic acid. After mixing uniformly, continue the esterification reaction until the esterification rate reaches 90%, and the excess ethylene glycol in the esterification reaction is extracted through the separation tower;

[0036] Then the temperature is raised to 270°C, and the pre-polycondensation reaction is carried out, and the pressure is 1-4K...

Example Embodiment

[0038] Example 2

[0039] The carboxylic acid to alcohol molar ratio is 1:1.25 terephthalic acid and ethylene glycol, and the catalyst and stabilizer are mixed and added to the esterification reactor for pre-esterification reaction. The catalyst is ethylene glycol antimony and stabilizer. It is trimethyl phosphate, the temperature of pre-esterification reaction is 240-265℃;

[0040] When the esterification rate reaches 50%, the mixture of 5-sodium isophthalate and ethylene glycol is added to the reaction system, and the amount of 5-sodium isophthalate 5-sulfonate added to the total 1.5% of the amount of added phthalic acid substance. After mixing uniformly, continue the esterification reaction until the esterification rate reaches 90%, and the excess ethylene glycol in the esterification reaction is extracted through the separation tower;

[0041] Then the temperature is raised to 270°C to carry out pre-polycondensation reaction, and the pressure is 1-4KPa. After the pre-polyconde...

Example Embodiment

[0043] Example 3

[0044] The carboxylic acid to alcohol molar ratio is 1:1.25 terephthalic acid and ethylene glycol, and the catalyst and stabilizer are mixed and added to the esterification reactor for pre-esterification reaction. The catalyst is antimony trioxide and stabilizer. It is phosphoric acid, the temperature of pre-esterification reaction is 240-265℃;

[0045] When the esterification rate reaches 70%, the mixture of sodium diethylene glycol isophthalate-5-sulfonate and ethylene glycol is added to the reaction system, and the added diethylene glycol isophthalate-5- The amount of sodium sulfonate is 1.5% of the total added terephthalic acid. After mixing uniformly, continue the esterification reaction until the esterification rate reaches 90%, and the excess ethylene glycol in the esterification reaction is extracted through the separation tower;

[0046] Then the temperature is raised to 270°C, and the pre-polycondensation reaction is performed, and the pressure is 1-4KP...

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Abstract

The invention belongs to the field of processing of high polymer materials, and discloses a preparation method for copolyester containing a sodium sulfonate group. The preparation method comprises thefollowing steps: (1) fully mixing dicarboxylic acid, dihydric alcohol and a reaction auxiliary agent, and carrying out a pre-esterification reaction; (2) when the esterification rate of the pre-esterification reaction reaches 50%-85%, adding a mixed solution of a sodium sulfonate group containing monomer and dihydric alcohol, continuously carrying out an esterification reaction, and extracting excessive dihydric alcohol in the esterification reaction through a separation tower until the esterification rate reaches 90% or above; and (3) continuously subjecting an oligomer obtained by the esterification reaction to a condensation polymerization reaction so as to obtain a copolyester chip capable of meeting spinning requirements. The preparation method for the copolyester provided by the invention is stable in process, obtains the copolyester with high melting point and good spinnability, solves the problem of material entrainment of a condensation polymerization vacuum system, and facilitates continuous production.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a preparation method of copolyester containing sodium sulfonate groups. Background technique [0002] The molecular structure of polyethylene terephthalate (PET) is highly symmetrical and regular, its fiber crystallinity and orientation are high, and the dye-friendly polar groups are less, resulting in poor dyeing performance and harsh dyeing conditions. It needs to be dyed with disperse dyes under high temperature and high pressure conditions. When PET fiber is blended with silk, wool and other fibers, if the dyeing process conditions are not properly controlled, it is easy to cause damage to silk and wool fibers, thus limiting its development and application to a certain extent. [0003] In order to improve the dyeing performance of conventional PET, a monomer (third monomer) containing a sodium sulfonate group is usually added in the production of conven...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/78D01F6/84
CPCC08G63/6886C08G63/78D01F6/84
Inventor 李志勇黄庆刘玉来金剑陈伟钟淑芳邱志成甘丽华金小培
Owner CHINESE TEXTILE ACAD
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