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Method for preparing antibacterial regenerated polyester by waste polyester alcoholysis method

A technology of recycled polyester and polyester alcohol, which is applied in the field of chemical fiber materials, can solve the problems of single performance of recycled polyester, achieve mild antibacterial effect, reduce white pollution, and reduce oil consumption

Pending Publication Date: 2021-04-06
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing antibacterial regenerated polyester by alcoholysis of waste polyester, aiming to solve the problem of single performance of regenerated polyester. The present invention utilizes chemical catalytic alcoholysis for efficient depolymerization, and then refines and purifies the product, Repolymerize to prepare high-quality recycled polyester, add antibacterial agent to realize high-value and functional recycling of waste polyester

Method used

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  • Method for preparing antibacterial regenerated polyester by waste polyester alcoholysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The recovered waste polyester (polyester pulp block, polyester bottle flakes) is dewatered and deoxidized to obtain the waste polyester raw material, which is put into the depolymerization reactor with ethylene glycol in a mass ratio of 1:2. The depolymerization reaction was carried out for 2 hours at 200° C. using zinc acetate catalyzed to prepare a depolymerization product containing ethylene terephthalate. The prepared depolymerization liquid is passed through a 100-mesh filter device, and impurities and insoluble matter in the depolymerization liquid are preliminarily filtered out. A high-purity depolymerization solution is obtained.

[0025] The cuprous oxide antibacterial agent with a particle size range of 200-500 nm is prepared by reducing copper sulfate with ascorbic acid.

[0026] Take the depolymerization solution and antibacterial agent according to Table 1, stir continuously for 1 hour, and then drop into the precondensation kettle together with antioxidan...

Embodiment 2

[0030] The recovered waste polyester (polyester fiber and polyester waste silk) is dewatered and deoxidized to obtain the waste polyester raw material, which is put into the depolymerization reactor with ethylene glycol in a mass ratio of 1:4, and then The depolymerization reaction was carried out for 6 hours at 180° C. under the catalysis of zinc acetate, and the depolymerization product containing ethylene terephthalate was prepared. The prepared depolymerization liquid is passed through a 100-mesh filter device, and impurities and insoluble matter in the depolymerization liquid are preliminarily filtered out. A high-purity depolymerization solution is obtained.

[0031] The nano-silver antibacterial agent with a particle diameter ranging from 10 to 150 nm is prepared by reacting silver salt (silver nitrate) with ammonia water (the concentration of the ammonia water is marked as 5 mol / L).

[0032] Take depolymerization solution and antibacterial agent according to table 1, ...

Embodiment 3

[0036] The recovered waste polyester (polyester pulp block) is dewatered and deoxidized to obtain the waste polyester raw material, which is put into the depolymerization reactor at a mass ratio of 1:3 with ethylene glycol, and used at 195°C Zinc acetate catalyzes the depolymerization reaction for 4 hours to prepare a depolymerized product containing ethylene terephthalate. The prepared depolymerization liquid is passed through a 100-mesh filter device, and impurities and insoluble matter in the depolymerization liquid are preliminarily filtered out. A high-purity depolymerization solution is obtained.

[0037] The cuprous oxide antibacterial agent with a particle size range of 200-500 nm is prepared by reducing copper sulfate with ascorbic acid.

[0038] Take the depolymerization solution and antibacterial agent according to Table 1, stir continuously for 1 hour, and then drop into the precondensation kettle together with antioxidant (1010 antioxidant, BASF) and stabilizer (...

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Abstract

The invention discloses a method for preparing antibacterial regenerated polyester by a waste polyester alcoholysis method, the method is characterized by comprising the following steps: 1) carrying out water removal and oxygen removal treatment on a waste polyester material, and carrying out pretreatment to obtain a waste polyester raw material; 2) depolymerizing the waste polyester and ethylene glycol under the action of an alcoholysis catalyst, and filtering to obtain a high-purity waste polyester depolymerization solution; 3) stirring and mixing the waste polyester depolymerization solution and antibacterial agent powder, adding a stabilizer and an antioxidant, jointly adding the mixture into a polymerization kettle, carrying out pre-condensation polymerization, condensation polymerization and final condensation polymerization to realize in-situ polymerization of the antibacterial regenerated polyester, and then preparing regenerated antibacterial polyester functional master batch by extrusion granulation; and 4) processing the obtained mixture into various products such as fibers, films, injection molding pieces and the like according to a conventional process. According to the invention, the regenerated polyester is endowed with a broad-spectrum antibacterial effect, petroleum consumption and energy consumption are greatly reduced, and the method has obvious green product characteristics, prevents environmental pollution, and has the advantages of energy conservation and emission reduction and strong environmental protection benefits.

Description

technical field [0001] The invention relates to a method for preparing antibacterial regenerated polyester by alcoholysis of waste polyester, which belongs to the field of chemical fiber materials. Background technique [0002] As of November 2019, China's polyester output exceeded 43 million tons, a year-on-year increase of 14.8%. Under the current consumption pattern, the global consumption of textile and clothing products is increasing year by year, which produces a huge amount of waste polyester, resulting in a waste of resources and a great impact on the environment. The recycling and reuse of waste polyester has been one of the focuses of the textile industry in recent years. [0003] Polyester recycling methods include physical regeneration and chemical regeneration. The physical recycling method generally refers to the production of recycled products through physical processes such as crushing, opening, spinning, and heat treatment of waste textiles under the condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J3/22C08L67/02C08K13/02C08K3/22C08K5/134C08K5/523C08K3/08C08K5/526
CPCC08J11/24C08J3/226C08J2367/02C08J2467/02C08K13/02C08K2003/2248C08K5/1345C08K5/523C08K2003/0806C08K2201/011C08K5/526C08K2201/014Y02W30/62
Inventor 张须臻黄飞桥王秀华施强南婧文周锦
Owner ZHEJIANG SCI-TECH UNIV
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