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Method for preparing water-soluble polyester based on aluminum compound as catalyst

A technology of water-soluble polyester and aluminum compound, applied in the field of preparation of water-soluble polyester, can solve the problems of difficult popularization and application, yellowish appearance of the product, insufficient activity of aluminum compound, etc. Effect

Inactive Publication Date: 2012-07-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention also aims to solve the problems that the aluminum compound is used as a catalyst for the preparation of ordinary polyesters, which has insufficient activity and the appearance of the synthesized product is yellowish, making it difficult to popularize and apply it in the polyester industry.

Method used

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  • Method for preparing water-soluble polyester based on aluminum compound as catalyst
  • Method for preparing water-soluble polyester based on aluminum compound as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take by weighing 25 grams of NaOH, dissolve it with deionized water to form an alkali solution with a mass concentration of 35%, put it in a heating container and heat it, and when the solution is close to boiling, add 37 grams of Al(OH) 3 , after stirring evenly, raise the temperature to about 120°C, and react for 2-3 hours to obtain a sodium aluminate solution, continue heating to make the solution boil at normal pressure and self-evaporate. When the temperature of the solution is about 150° C. by evaporation, it is cooled, crystallized and crushed to obtain a product (catalyst A) whose main component is sodium metaaluminate.

[0034] Add 250 grams of terephthalic acid and 121.5 grams of ethylene glycol into the polymerization kettle, and add 0.0375 grams of anhydrous sodium acetate to carry out the esterification reaction. The water generated, after the esterification finishes, is down to normal pressure, adding mass concentration is 86.7 grams of ethylene glycol sol...

Embodiment 2

[0036]Add 250 grams of terephthalic acid and 121.5 grams of ethylene glycol into the polymerization kettle, and add 0.0375 grams of anhydrous sodium acetate to carry out the esterification reaction. The water generated, after the esterification finishes, is down to normal pressure, adding mass concentration is 115.5 grams of ethylene glycol solution of 20% bishydroxyethyl isophthalate-5-sodium sulfonate (SIPE), and the number average molecular weight is 4000 8.7 grams of polyethylene glycol and catalyst A of 0.375 grams of weight (1500ppm relative to the amount of terephthalic acid), vacuumize and decompress until the system pressure is lower than 130Pa, and the reaction temperature is gradually raised to about 280 ° C. When the system After the reaction reaches the desired viscosity, the reaction is stopped, and then the reaction product is continuously extruded from the bottom of the polymerization tank in a strip shape, cooled, and pelletized for performance testing.

Embodiment 3

[0038] Add 250 grams of terephthalic acid and 121.5 grams of ethylene glycol into the polymerization kettle, and add 0.0375 grams of anhydrous sodium acetate to carry out the esterification reaction. The water generated, after the esterification finishes, is down to normal pressure, adding mass concentration is 100.1 grams of ethylene glycol solution of 20% bishydroxyethyl isophthalate-5-sodium sulfonate (SIPE), and the number average molecular weight is 4000 8.7 grams of polyethylene glycol and catalyst A of 0.35 grams of weight (1400ppm relative to the amount of terephthalic acid), vacuumize and depressurize to a system pressure lower than 130Pa, while the reaction temperature gradually rises to about 280 ° C, when the system After the reaction reaches the desired viscosity, the reaction is stopped, and then the reaction product is continuously extruded from the bottom of the polymerization tank in a strip shape, cooled, and pelletized for performance testing.

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Abstract

The invention relates to a method for preparing water-soluble polyester based on an aluminum compound as a catalyst. The method comprises the following steps of: firstly, carrying out esterification reaction on terephthalic acid and glycol in a certain molar ratio; and after the esterification reaction is finished, carrying out condensation reaction by adding an ion type structure unit such as sodium dimethyl isophthalate-5-sulfonate or sodium bis(hydroxyl ethyl) isophthalate-5-sulfonate as a third monomer and polyethylene glycol as a fourth monomer and then adding the aluminum compound as the catalyst so as to finally obtain the water-soluble polyester. In the preparation method provided by the invention, a heavy metal compound such as an antimony compound is not used as the catalyst, so as to reduce the pollution of water quality and be beneficial to environment conservation; and the price of the catalyst is low, and the prepared water-soluble polyester can be used for producing sea-island filaments and the like.

Description

technical field [0001] The invention belongs to the field of preparation of water-soluble polyester, in particular to a method for preparing water-soluble polyester by using an aluminum compound as a catalyst. Background technique [0002] Water-soluble polyester (or alkali-soluble polyester) is a modified polyester, which is an ionic copolyester that introduces ionic structural units into the molecular chain of polyethylene terephthalate (PET). . From domestic and foreign literature reports, its preparation method almost all uses dimethyl isophthalate-5-sodium sulfonate (SIPM) or its product after esterification with ethylene glycol (EG) isophthalic acid bishydroxy Sodium ethyl ester-5-sulfonate (SIPE) is the third monomer, and in order to improve the rheology of the melt and improve the spinnability, add the fourth monomer that can improve the flexibility of macromolecules and further improve the swelling property of the polymer. Mainly use polyethylene glycol (PEG) or d...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/84
Inventor 陈大俊林庆辉
Owner DONGHUA UNIV
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