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Method for preparing sodium diethylene glycol isophthalate-5-sulfonate modified polyester

A technology of diethylene glycol isophthalate and diethylene glycol phthalate is applied in the field of preparing diethylene glycol isophthalate-5-sodium sulfonate modified polyester, which can solve difficult Accurately determine the dosage ratio, increase the complexity of the process, etc., to achieve high coloring rate, good color fastness, and improve the effect of transesterification rate

Active Publication Date: 2019-03-26
SHANGHAI LIANSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that part of ethylene glycol needs to be added to cool the reaction system to about 230 ° C, and then the ethylene glycol used for cooling is removed by vacuum extraction, which not only increases the complexity of the process, but also makes it difficult to accurately determine the polycondensation process. Raw material ratio between terephthalic acid, ethylene glycol and diethylene glycol isophthalate-5-sodium sulfonate

Method used

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  • Method for preparing sodium diethylene glycol isophthalate-5-sulfonate modified polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 500kg of dimethyl isophthalate and 1250kg of ethylene glycol into the reaction kettle, start the agitator, add 0.25kg of sodium acetate and 0.75kg of calcium acetate, close the feeding port, pass in nitrogen protection, and start the heater , the material was heated from room temperature to 185° C. within 2 hours. After reacting for about 4-6 hours, stop the reaction to obtain a reaction product containing diethylene glycol isophthalate. The reaction product was cooled to below 130°C, and its physical and chemical properties were characterized. See Table 1 below for the results.

Embodiment 2

[0031] Put 500kg of dimethyl isophthalate and 1250kg of ethylene glycol into the reaction kettle, start the agitator, add 0.5kg of sodium acetate and 1.5kg of calcium acetate, close the feeding port, pass in nitrogen protection, and start the heater , the material was heated from room temperature to 185° C. within 2 hours. After reacting for about 4-6 hours, stop the reaction to obtain a reaction product containing diethylene glycol isophthalate. The reaction product was cooled to below 130°C, and its physical and chemical properties were characterized. See Table 1 below for the results.

Embodiment 3

[0033] Put 500kg of dimethyl isophthalate and 1250kg of ethylene glycol into the reactor, start the agitator, add 0.25kg of sodium acetate, 0.75kg of calcium acetate and 0.6kg of nickel acetate, close the feeding port, and feed Under nitrogen protection, start the heater, and heat the material from room temperature to 185° C. within 2 hours. After reacting for about 4-6 hours, stop the reaction to obtain a reaction product containing diethylene glycol isophthalate. The reaction product was cooled to below 130°C, and its physical and chemical properties were characterized. See Table 1 below for the results.

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Abstract

The invention relates to a method for preparing sodium diethylene glycol isophthalate-5-sulfonate modified polyester. The method comprises the following steps: S1: taking sodium diethylene glycol isophthalate 5-sulfonate and excessive ethylene glycol to react under an inert atmosphere in the presence of a catalyst composition, so as to obtain an ethylene glycol solution of sodium diethylene glycolphthalate-5-sulfonate; and S2: taking p-phthalic acid, the ethylene glycol and the ethylene glycol solution of the sodium diethylene glycol phthalate-5-sulfonate to obtain the sodium diethylene glycol isophthalate-5-sulfonate modified polyester. The catalyst composition comprises sodium acetate and calcium acetate; and based on the mass, the dosage of the sodium acetate is 0.05 to 0.1 percent ofthe dosage of the sodium diethylene glycol isophthalate-5-sulfonate and the dosage of the calcium acetate is 0.15 to 0.3 percent of the dosage of the sodium diethylene glycol isophthalate-5-sulfonate.By adopting the method, the sodium diethylene glycol isophthalate-5-sulfonate modified polyester, which has a high coloring rate and good color fastness and can be used for dyeing by utilizing a cationic dyestuff, can be prepared.

Description

technical field [0001] This application relates to the field of polyester technology. Specifically, the application relates to a method for preparing diethylene glycol isophthalate-5-sodium sulfonate modified polyester. Background technique [0002] Polyester fiber is a common chemical fiber fabric fiber, which is a synthetic fiber obtained by spinning polyester of organic dibasic ester and diol polycondensation glycol. Ordinary polyester fibers have the advantages of high breaking strength and high elastic modulus, but due to the tight structure of polyester fibers and the lack of groups for adsorbing ionic dyes in the molecules, it is difficult to dye. In the case of using cationic dyes and disperse dyes, it is difficult for polyester fibers to obtain good color uptake and color fastness. [0003] Sodium Diethylene Glycol Isophthalate-5-sulfonate (also known as 1,3-Diethylene Glycol Phthalate-5-Sodium Sulfonate, hereinafter referred to as SIPE) is a very important chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688C08G63/78C08G63/82C08G63/83D01F6/84D06P1/16D06P3/36
CPCC08G63/6886C08G63/78C08G63/82C08G63/83D01F6/84D06P1/16D06P3/36
Inventor 董绍华
Owner SHANGHAI LIANSHENG CHEM
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