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Aluminum catalyst for polyester synthesis, preparation method thereof and usage method thereof

A catalyst and polyester technology, applied in the field of catalysis, can solve the problems of inferior hue of polyester, unused industrial production, poisonous tin, etc., and achieve the effects of low toxicity, low cost and guaranteed activity

Active Publication Date: 2011-11-09
CHANGZHOU INST OF CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalytic synthesis of polyester with this kind of catalyst has good catalytic activity, but the hue of the obtained polyester is not as good as that of antimony-based catalysts, and tin is poisonous, so this kind of catalyst has not been used in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of aluminum ethylene glycol: use lithium aluminum hydride, aluminum alcohol, aluminum flakes, and aluminum powder as aluminum sources, and react with ethylene glycol to obtain aluminum ethylene glycol. In each raw material, ethylene glycol is excessive, and ethylene glycol and The molar ratio of aluminum source can reach 4:1~6:1.

[0031] Aluminum glycolate preparation steps:

[0032] 1) Put ethylene glycol into the reaction bottle and heat up to 150°C;

[0033] 2) Slowly add lithium aluminum hydride, pure aluminum powder, aluminum flakes or aluminum alkoxide. After the addition, raise the temperature to 180°C until the end of the reaction. If aluminum alkoxide is used as the raw material, it is necessary to feed Nitrogen; if aluminum is used as a raw material, it is necessary to add 0.5% to 1% mercurous chloride or iodine as a catalyst in ethylene glycol before the reaction;

[0034] 3) refluxing for 50 to 70 minutes;

[0035] 4) After reflux, the soluti...

Embodiment 2

[0039]Aluminum tert-butoxide is used as the aluminum source for the preparation of aluminum ethylene glycol, the mass ratio of aluminum tert-butoxide to ethylene glycol is 1:40, and nitrogen is blown from the beginning of the reaction to the end of reflux, and the aluminum ethylene glycol is prepared according to the method of Example 1. . The conversion rate of aluminum tert-butoxide was calculated to be 80% by detecting the gas phase distillate.

[0040] The method of using the obtained aluminum ethylene glycol in the process of synthesizing polyester by polycondensation reaction of terephthalic acid and ethylene glycol is the same as that in Example 1.

Embodiment 3

[0042] Aluminum ethylene glycol is prepared by using aluminum n-butoxide as the aluminum source, and the mass ratio of aluminum n-butoxide to ethylene glycol is 1:40. The nitrogen gas is passed from the beginning of the reaction to the end of the reflux, and the aluminum ethylene glycol is prepared according to the method of Example 1. . The conversion rate of aluminum n-butoxide was calculated to be 80% by detecting the gas phase distillate.

[0043] The method of using the obtained aluminum ethylene glycol in the process of synthesizing polyester by polycondensation reaction of terephthalic acid and ethylene glycol is the same as that in Example 1.

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PUM

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Abstract

The invention discloses an aluminum catalyst for polyester synthesis, a preparation method thereof and a usage method thereof. The catalyst which is aluminum glycol and is special for a polycondensation reaction in a polyester synthesis process of terephthalic acid and glycol is prepared through reacting aluminum / aluminum alcoholates / lithium aluminum hydride with glycol. The catalyst, which has less toxicity, allows the molecular weight of PET catalyzed by the catalyst to achieve more than 30,000, can coexist with polycondensation products, has no influence on the quality of the PET, allows requirements of environmental protection to be satisfied and requirements of activity to be guaranteed, has a high activity on the PET synthesizing reaction, and has low cost, is a novel catalyst for the condensation polymerization of PET synthesis.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to an aluminum-based catalyst for synthesizing PET polycondensation reaction using ethylene glycol and terephthalic acid as raw materials, a preparation method and a use method thereof. Background technique [0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids. It mainly refers to polyethylene terephthalate (PET), and customarily also includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylate. It is a kind of engineering plastic with excellent performance and wide application. [0003] In the PET production industry, terephthalic acid or dimethyl terephthalate can be esterified or transesterified with ethylene glycol to produce bis(2-hydroxyethyl) terephthalate, and then use a catalyst in vacuum It is polycondensed at high temperature to obtain PET. At present, fiber-grade PET at ho...

Claims

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Application Information

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IPC IPC(8): C08G63/84C08G63/183
Inventor 王公应萧斌梅仁浩杨先贵
Owner CHANGZHOU INST OF CHEM
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