Process for preparing water-soluble copolyester

A copolyester, water-soluble technology, applied in the field of high polymer synthesis, can solve the problems of adverse effects in the production process of sea-island fibers and poor crystallization properties

Active Publication Date: 2005-08-17
SINOPEC YIZHENG CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the water-soluble copolyester prepared by the above method has good hydrolysis performance, the crystallization performance is still poor, which will adversely affect the subsequent production process of sea-island fibers

Method used

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  • Process for preparing water-soluble copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 91.26 kg of PTA (purified terephthalic acid), 10.14 kg of isophthalic acid, 65.3 kg of EG (ethylene glycol), 80 grams of antimony acetate, 50 grams of sodium acetate, and 30 grams of phosphoric acid were successively put into a 300L stainless steel reactor. use N 2 Pressurize after several replacements, use the valve at the top of the fractionation column to adjust the pressure in the kettle to 0.2-0.25MPa (gauge pressure), stir at 65rpm, and raise the temperature to 220°C-260°C for esterification. Release the pressure when the water output reaches 21 kilograms, end the esterification, then drop into 53.7 kilograms of ES-40 (weight percent concentration is the ethylene glycol solution of 40% bishydroxyethyl isophthalate-5-sodium sulfonate) 15 kilograms of polytetrahydrofuran (accounting for 10% of copolyester gross weight) that the number average molecular weight is 5500, heat up and reduce pressure, the stirring speed is adjusted to 40~55rpm, carry out under 280~295 ℃,...

Embodiment 2

[0026]92.35 kg of PTA, 10.25 kg of isophthalic acid, 66 kg of EG, 80 g of antimony acetate, 50 g of sodium acetate, and 30 g of phosphoric acid were successively put into a 300L stainless steel reactor. After replacing with N2 for several times, pressurize, use the valve at the top of the fractionating column to adjust the pressure in the kettle to 0.2-0.25MPa (gauge pressure), stir at 65rpm, and raise the temperature to 220-260°C to carry out the esterification reaction. Release the pressure when the water output reaches 21 kilograms, end the esterification, then drop into 54.2 kilograms of ES-40 (weight percent concentration is the ethylene glycol solution of 40% bishydroxyethyl isophthalate-5-sodium sulfonate) , 13.5 kilograms of polytetrahydrofuran (accounting for 9% of copolyester gross weight) that the number average molecular weight is 5500, heat up and reduce pressure, the stirring speed is adjusted to 40~50rpm, carry out under 282~290 ℃, absolute pressure 30~300Pa cond...

Embodiment 3

[0031] 92.22 kg of PTA, 11.38 kg of isophthalic acid, 66.7 kg of EG, 80 g of antimony acetate, 50 g of sodium acetate, and 30 g of phosphoric acid were successively put into a 300L stainless steel reactor. use N 2 Pressurize after several replacements, use the valve at the top of the fractionation column to adjust the pressure in the kettle to 0.2-0.25MPa (gauge pressure), stir at 65rpm, and raise the temperature to 220°C-260°C for esterification. Release the pressure when the water output reaches 21 kilograms, end the esterification, then drop into 54.9 kilograms of ES-40 (the concentration by weight is the ethylene glycol solution of 40% bishydroxyethyl isophthalate-5-sodium sulfonate) 12 kilograms of polytetrahydrofuran (accounting for 8% of copolyester gross weight) that the number-average molecular weight is 5500, heat up and reduce pressure, the stirring speed is adjusted to 40~50rpm, carry out under 283~291 ℃, absolute pressure 30~300Pa conditions condensation reaction...

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Abstract

The water soluble copolyester is prepared with polytetrahydrofuran in number average molecular weight of 350-20000 as the fourth component, and metaphthalate-5-sodium sulfonate, metaphthalate dihydroxyethyl-5-sodium sulfonate, metaphthalate dimethyl-5-potassium sulfonate, or other metaphthalate type sulfonate as the third component, and through polycondensation in PTA or DMT path. Compared with the copolyester with polyglycol and other aliphatic flexible compound as the fourth component, the present invention is water soluble and has better crystallizing performance. The product produces no adhesion during drying, and may be blended with conventional polyester slice to obtain POY sea island cotton with flexible elastic process to raise the spinnability and processibility of sea island fiber.

Description

technical field [0001] The invention relates to the preparation of polyester, in particular to a method for preparing water-soluble copolyester, and belongs to the technical field of high polymer synthesis. Background technique [0002] Microfiber is the leader in the development and popularity of polyester filament varieties in recent years. Because of its high coverage, the luster of the fabric is soft and elegant, and it has unique softness, drapability, breathability and other advantages, and is well received by the market. The island-in-the-sea composite spinning method is one of the effective methods for preparing ultrafine fibers. The single fiber density of the final fiber product can reach below 0.01dtex, and the product has very high added value. Generally, the sea-island composite spinning method is to blend and spin water-soluble copolyester (COPET) and conventional polyester (PET) in an appropriate proportion, and the obtained fiber has a sea-island structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 魏高富戴志彬常华严建华
Owner SINOPEC YIZHENG CHEM FIBER
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