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Preparation method of low-melting-point regenerated copolyester

A technology of copolyester and low melting point, applied in the field of preparation of low melting point regenerated copolyester, can solve problems such as low catalytic efficiency of catalyst, and achieve the effect of good economic value

Active Publication Date: 2015-02-04
JIANGSU HENGZE COMPOSITE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method of low-melting point regenerated copolyester, aims to solve the problem that the disclosed alcoholysis catalyst used in the current polyester alcoholysis method functionalized chemical regeneration process remains in the alcoholysis product and has a negative impact on re-copolymerization. Unfavorable effects in the process, and the problem of low catalytic efficiency due to the heterogeneity of the catalyst in the depolymerization solution

Method used

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  • Preparation method of low-melting-point regenerated copolyester
  • Preparation method of low-melting-point regenerated copolyester

Examples

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Effect test

Embodiment 1

[0050] First, the preparation of lithium glycol titanate includes the following steps:

[0051] a) Mix tetraethyl titanate uniformly with ethylene glycol at 50°C under nitrogen protection, and the molar ratio of tetraethyl titanate to ethylene glycol is 1:100;

[0052] b) Add lithium hydroxide, the molar ratio of lithium hydroxide to tetraethyl titanate is 2.05:1, continue stirring until the reaction system is a uniform and transparent liquid, and then increase the reaction temperature to 180°C;

[0053] c) During the reaction process, reflux the ethylene glycol and remove the low-boiling ethanol and water produced by the reaction. The reaction time is 3 hours. After the reaction, the temperature is 190℃, the pressure of the reaction system is 0.5atm, and within 0.5min. Evaporate the ethylene glycol in the system completely, and evaporate the glycol in the system completely to obtain a white solid. This solid is recrystallized three times with ethanol-chloroform to obtain colorless c...

Embodiment 2

[0066] Firstly, the preparation of sodium glycol titanate includes the following steps:

[0067] a) Mix tetra-n-butyl titanate with ethylene glycol uniformly at 150°C under nitrogen protection, and the molar ratio of tetra-n-butyl titanate to ethylene glycol is 1:50;

[0068] b) Add sodium hydroxide, the molar ratio of sodium hydroxide to tetra-n-butyl titanate is 2.03:1, continue to stir until the reaction system is a uniform and transparent liquid, then raise the reaction temperature to 210°C;

[0069] c) During the reaction, reflux the ethylene glycol and remove the low-boiling n-butanol and water generated by the reaction. The reaction time is 2 hours. After the reaction is completed, the temperature is 210°C and the pressure of the reaction system is 0.8atm within 1min. Evaporate the ethylene glycol in the system completely, and evaporate the glycol in the system completely to obtain a white solid. This solid is recrystallized three times with ethanol-chloroform to obtain colorl...

Embodiment 3

[0082] Firstly, the preparation of potassium propylene glycol titanate includes the following steps:

[0083] a) Mix tetraisopropyl titanate with 1,2-propanediol uniformly at 100°C under nitrogen protection, and the molar ratio of tetraisopropyl titanate to 1,2-propanediol is 1:80;

[0084] b) Add potassium hydroxide, the molar ratio of potassium hydroxide to tetraisopropyl titanate is 2.02:1, continue to stir until the reaction system is a uniform and transparent liquid, then raise the reaction temperature to 200°C;

[0085] c) During the reaction, reflux 1,2-propanediol and remove the low-boiling isopropanol and water produced by the reaction. The reaction time is 4 hours. After the reaction, the temperature is 200°C and the reaction system pressure is 0.7atm for 1min. In the middle, the ethylene glycol in the system is completely evaporated, and the diol in the system is completely evaporated to obtain a light yellow solid. This solid is recrystallized three times with ethanol-chl...

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Abstract

The invention relates to a preparation method of low-melting-point regenerated copolyester, which is used in the fields of chemical regeneration of waste polyester and functional development of polyester. In the method, a dibasic alcohol titanium alkali metal coordination compound which can be dissolved in ethylene glycol is used as a catalyst to catalyze the ethylene glycol depolymerization of a waste polyester material and the copolycondensation process of a depolymerization product and aliphatic dibasic acid small-molecule polyester ether, and crystalline low-melting-point regenerated copolyester is obtained, wherein the scope of the melting point is 110-210 DEG C, the melting range is less than 40 DEG C, and the copolyester is favorable in color. The catalyst used in the method has high catalytic activity for the ethylene glycol depolymerization of the polyester and the copolymerization process of the depolymerization product, and further copolymerization can be performed without removing the catalyst from the depolymerization product, thus greatly saving the separation and purification cost of the depolymerization product, improving the production efficiency, and providing the possibility for continuous functional chemical regeneration of the waste polyester material.

Description

Technical field [0001] The present invention belongs to the technical field of polyester chemical regeneration, and relates to a preparation method of low melting point regenerated copolyester, and in particular to a method that uses an alkali metal coordination compound of titanium diolate soluble in ethylene glycol as a catalyst for A method for catalyzing ethylene glycol depolymerization of polyester and copolymerization of depolymerized products to prepare low-melting point regenerated copolyester. Background technique [0002] Polyethylene terephthalate (PET, polyester for short) is a semi-crystalline thermoplastic polymer material with excellent performance, which is widely used in chemical fiber, packaging, medicine, electronic machinery and other fields. In 2010 , The total global production of polyester reached 56.1 million tons. With the rapid development of the polyester industry, the single performance of polyester products and the disposal of waste polyester product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/85C08G63/83
CPCY02P20/584
Inventor 王华平王少博王朝生李建武陈向玲王赛博黄璐徐秋舒
Owner JIANGSU HENGZE COMPOSITE MATERIALS TECH
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