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Catalyst for polyester synthesis and its preparation method and application

A catalyst and polyester technology, applied in the field of polyester synthesis catalyst and its preparation, can solve the problems of affecting the quality uniformity of polyester products, high surface energy of catalyst powder, difficult to achieve ultra-fineness, etc., and achieve excellent humidity and heat resistance. Aging performance, easy industrial application, the effect of inhibiting the formation of cyclic oligomers

Active Publication Date: 2022-05-17
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum-titanium composite catalyst prepared by this invention patent is a precipitate formed by the co-hydrolysis of tetrabutyl titanate and sodium aluminate, which is dried and then ground. Therefore, it is difficult for the titanium-aluminum composite catalyst to be ultra-fine. The surface energy of the catalyst powder is high, and it is easy to agglomerate during the polyester polymerization process, thus affecting the quality uniformity of the polyester product

Method used

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  • Catalyst for polyester synthesis and its preparation method and application
  • Catalyst for polyester synthesis and its preparation method and application
  • Catalyst for polyester synthesis and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Add 40 grams of aluminum isopropoxide into 160 grams of isopropanol and heat to reflux for 1 hour to obtain an isopropanol solution with a concentration of aluminum isopropoxide of 20%.

[0047] (2) The isopropanol solution of aluminum isopropoxide is slowly added to the ultrasonic reactor equipped with polyethylene glycol concentration of 1wt%, potassium dihydrogen phosphate concentration of 0.5% in the ultrasonic reactor of 800 grams of aqueous solution, the molecular weight of polyethylene glycol is 1000, the temperature of the ultrasonic reactor is 90 °C, and the reaction time is 1 h, and a water-based γ-AlOOH suspension is obtained.

[0048] (3) Add 400 grams of ethylene glycol to the water-based γ-AlOOH suspension, then distill under reduced pressure at 90° C. to remove water and low-boiling alcohols to obtain an ethylene glycol-based γ-AlOOH suspension.

[0049] (4) adding 20 grams of lanthanum acetylacetonate into 380 grams of isopropanol and heating to refl...

Embodiment 2

[0053] (1) Add 40 grams of aluminum ethoxide to 360 grams of isopropanol and heat to reflux for 1 hour to obtain an isopropanol solution with a concentration of aluminum ethoxide of 10%.

[0054] (2) The isopropanol solution of aluminum ethylate is slowly added to the ultrasonic reactor equipped with polyethylene glycol concentration of 3 wt%, sodium dihydrogen phosphate concentration of 0.17% in the ultrasonic reactor of 800 grams of aqueous solution, the molecular weight of polyethylene glycol is 400 , the temperature of the ultrasonic reactor was 80 °C, and the reaction time was 1 h to obtain a water-based γ-AlOOH suspension.

[0055] (3) Add 400 grams of ethylene glycol to the water-based γ-AlOOH suspension, then distill under reduced pressure at 80° C. to remove water and low-boiling alcohols to obtain an ethylene glycol-based γ-AlOOH suspension.

[0056] (4) adding 10.8 grams of lanthanum acetylacetonate into 529.2 grams of isopropanol and heating to reflux for 1 h to ob...

Embodiment 3

[0060] (1) Add 24.6 grams of aluminum sec-butoxide into 467.4 grams of isopropanol and heat to reflux for 1 hour to obtain an isopropanol solution with a concentration of aluminum isopropoxide of 5%.

[0061] (2) The isopropanol solution of aluminum sec-butoxide is slowly added to the ultrasonic reactor equipped with polyethylene glycol concentration of 10wt%, sodium hypophosphite concentration of 1.1% in the ultrasonic reactor of 400 grams of aqueous solution, the molecular weight of polyethylene glycol 400, the temperature of the ultrasonic reactor was 100 °C, and the reaction time was 1 h to obtain a water-based γ-AlOOH suspension.

[0062] (3) Add 800 grams of ethylene glycol to the water-based γ-AlOOH suspension, then distill under reduced pressure at 100° C. to remove water and low-boiling alcohols to obtain an ethylene glycol-based γ-AlOOH suspension.

[0063] (4) adding 57.5 grams of hafnium acetylacetonate into 1092.5 grams of isopropanol and heating to reflux for 1 h...

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Abstract

The invention discloses a catalyst for polyester synthesis and its preparation method and application. The catalyst includes aluminum element, rare earth element and phosphorus element, wherein the molar ratio of aluminum element, rare earth element and phosphorus element is 1:0.1~1:0.05~ 0.5; the preparation method comprises: (1) dissolving aluminum alkoxide in alcohol to obtain an alcohol solution of aluminum alkoxide; (2) adding the solution of aluminum alkoxide to hydrogen phosphate aqueous solution to obtain water-based γ-AlOOH suspension; (3) adding ethylene glycol to the water-based γ-AlOOH suspension, and then removing water and low-boiling point alcohol to obtain an ethylene glycol-based γ-AlOOH suspension; (4) adding rare earth acetylacetonate The alcohol solution of the salt is added to the ethylene glycol-based γ-AlOOH suspension, and then the isopropanol is removed to obtain a catalyst for polyester synthesis. The catalyst of the invention has high catalytic activity and can be used to prepare polyester with low cyclic oligomer content and excellent damp heat aging resistance.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a catalyst for polyester synthesis and its preparation method and application. Background technique [0002] At present, the catalysts used in the industrial production of polyester are mainly antimony-based catalysts. Antimony-based catalysts have moderate activity and low price, but antimony has chronic toxicity and carcinogenicity to human body and organisms, which is not conducive to environmental protection requirements. With the gradual enhancement of people's awareness of environmental protection, the heavy metal-free polyester has become a hot and difficult point in the current polyester industry. Titanium-based catalysts have no impact on human health and the ecological environment. They have high catalytic activity, can reduce the temperature of esterification reaction, and help reduce energy consumption. However, they also have high catalytic activi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/84C08G63/183
CPCC08G63/84C08G63/183Y02P20/584
Inventor 邱志成李鑫金剑王颖王雪
Owner CHINESE TEXTILE ACAD
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