Preparation method of regenerated polyester fibers

A technology for regenerated polyester and fiber, applied in the preparation of ester groups and hydroxyl groups, chemical instruments and methods, single-component polyester artificial filaments, etc., can solve the problem of affecting the quality of repolymerization products, poor quality, low catalytic efficiency, etc. question

Active Publication Date: 2015-02-18
JIANGSU HENGZE COMPOSITE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most well-known alcoholysis catalyst is a metal salt represented by zinc acetate. Although the alcoholysis catalytic efficiency of zinc acetate is high, zinc acetate has serious defects as a depolymerization catalyst. First, its dosage is relatively high, generally 0.5-1.5% of the PET mass, and it is difficult to remove from the product after depolymerization. At the same time, the high content of zinc ions remaining in the depolymerization product will cause thermal degradation during repolymerization due to its catalytic mechanism for carbonyl oxygen coordination. The side reaction is accelerated, which makes the growth of molecular weight limited, the viscosity of recycled polyester is low, the quality is poor, and the spinnability is poor
Invention patent CN 102584594 AC℃l42-/NiCl42-type ionic liquid catalyzed alcoholysis method of polyethylene terephthalate, invention patent CN 102731310 A first transition metal ionic liquid catalyzed alcoholysis of polyethylene terephthalate The method of alcohol ester, and CN200810101969.2 is used in the polyester alcoholysis catalyst announced in the catalyst of alcoholysis polyethylene terephthalate, although have mild reaction conditions,...

Method used

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  • Preparation method of regenerated polyester fibers
  • Preparation method of regenerated polyester fibers
  • Preparation method of regenerated polyester fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] At first carry out the preparation of ethylene glycol lithium titanate, it comprises the following steps:

[0055] a) Uniformly mix tetraethyl titanate with ethylene glycol at 50°C under nitrogen protection, the molar ratio of tetraethyl titanate to ethylene glycol is 1:100;

[0056] b) Add lithium hydroxide, the molar ratio of lithium hydroxide to tetraethyl titanate is 2.05:1, continue to stir until the reaction system is a uniform and transparent liquid, then raise the reaction temperature to 180°C;

[0057] c) During the reaction process, reflux ethylene glycol and exclude the low-boiling ethanol and water generated by the reaction. The reaction time is 3 hours. Completely evaporate the ethylene glycol in the system, and completely evaporate the dihydric alcohol in the system to obtain a white solid, which is recrystallized three times with ethanol-chloroform to obtain a colorless crystal, which is to obtain ethylene glycol lithium titanate;

[0058] The structural...

Embodiment 2

[0069] At first carry out the preparation of ethylene glycol sodium titanate, it may further comprise the steps:

[0070] a) Uniformly mix tetra-n-butyl titanate with ethylene glycol at 150°C under nitrogen protection, the molar ratio of tetra-n-butyl titanate to ethylene glycol is 1:50;

[0071] b) Add sodium hydroxide, the molar ratio of sodium hydroxide to tetra-n-butyl titanate is 2.03:1, and continue to stir until the reaction system becomes a uniform and transparent liquid, then raise the reaction temperature to 210°C;

[0072] c) During the reaction process, reflux ethylene glycol and exclude the low-boiling n-butanol and water generated by the reaction. The reaction time is 2 hours. Completely evaporate the ethylene glycol in the system and completely evaporate the dihydric alcohol in the system to obtain a white solid, which is recrystallized three times with ethanol-chloroform to obtain a colorless crystal, which is to obtain ethylene glycol sodium titanate;

[0073...

Embodiment 3

[0084] At first carry out the preparation of propylene glycol potassium titanate, it may further comprise the steps:

[0085] a) Uniformly mix tetraisopropyl titanate with 1,2-propanediol at 100°C under nitrogen protection conditions, the molar ratio of tetraisopropyl titanate to 1,2-propanediol is 1:80;

[0086] 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;

[0087] c) During the reaction, reflux 1,2-propanediol and exclude the low-boiling isopropanol and water generated by the reaction. The reaction time is 4 hours. After the reaction is completed, the temperature is 200 ° C, and the reaction system pressure is 0.7 atm, 1 min Completely evaporate the ethylene glycol in the system, and completely evaporate the glycol in the system to obtain a light yellow solid, which is recrystallized three ti...

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Abstract

The invention discloses a preparation method of regenerated polyester fibers. The preparation method is used in the field of chemical regeneration of waste polyester. According to the method, a glycol titanium alkali metal coordination compound which can be dissolved in ethylene glycol is used as a catalyst for catalyzing ethylene glycol in a waste polyester product for depolymerization and a repolymerization process of depolymerized products; the catalyst is higher in catalysis activity in ethylene glycol depolymerization of polyester and the repolymerization process of the depolymerized products; therefore, in the preparation method of the regenerated polyester fibers, the catalyst is not required to be removed from the depolymerized products in a regenerated polyester fiber preparation process, and can be used for polycondensation, so that the depolymerized product separation and purification cost is greatly reduced, and the quality of regenerated polyester is guaranteed; the color and the intensity of the regenerated polyester fibers can be obviously improved, and continuous closed-loop recycling of the waste polyester product can be realized.

Description

technical field [0001] The invention belongs to the technical field of chemical regeneration of polyester, and relates to a preparation method of recycled polyester fiber, in particular to a method for using a dihydric alcohol titanium alkali metal coordination compound soluble in ethylene glycol as a catalyst for use in waste polyester fibers. The invention relates to a method for preparing regenerated polyester fibers obtained by depolymerizing ethylene glycol of ester products and recondensing spinning. 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. The number one variety of fiber. In 2010, the total global polyester production reached 56.1 million tons. With the rapid development of the polyester industry, the disposal of waste polyester products has come...

Claims

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Application Information

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IPC IPC(8): D01F6/62D01D5/098C08G63/85C08G63/83C07C69/82C07C67/03B01J31/22
CPCY02P20/584
Inventor 王少博王华平王朝生李建武陈向玲王赛博刘嘉懿江晓婷
Owner JIANGSU HENGZE COMPOSITE MATERIALS TECH
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