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Polyester reclaimed material recycling method

A technology for recycling materials and polyester, applied in recycling technology, plastic recycling and other directions, can solve the problem of high TVOC content in recycled polyester, avoid the production of diethylene glycol, improve depolymerization efficiency, and save production costs.

Active Publication Date: 2017-12-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recycling recycled polyester materials, which aims to effectively improve the quality of recycled polyester while taking into account the production cost and equipment modification cost, and can effectively solve the problem of recycled polyester produced by the current improved physical method. The problem with high TVOC content

Method used

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  • Polyester reclaimed material recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of recycling method of polyester recycled material, such as figure 1 As shown, the steps are as follows:

[0058] 1) Add polyester oligomer melt with a moisture content of 50ppm, a catalyst and a polyester oligomer melt with an average degree of polymerization of 2 into a twin-screw extruder for reactive melt blending, and obtain an average degree of polymerization of The preliminary depolymerization melt of 40, wherein, the mass ratio of polyester reclaimed material and polyester oligomer melt is 1:1, and catalyzer is ethylene glycol titanium, with respect to the polyester oligomer with respect to the metal element quality in the catalyzer Calculated by melt mass, the content of catalyst is 50ppm; the temperature of reactive melt blending is: the temperature of twin-screw feed section is 268°C, the temperature of twin-screw compression section is 288°C, the temperature of homogenization section is 288°C, and the time is 2min. For nitrogen protection;

[0059] ...

Embodiment 2

[0071] A method for recycling recycled polyester, the steps are as follows:

[0072] 1) The polyester oligomer melt with a moisture content of 90ppm, a catalyst and an average degree of polymerization of 1.5 is added to a twin-screw extruder for reactive melt blending, and the average degree of polymerization obtained after the reaction is The preliminary depolymerization melt of 20, wherein, the mass ratio of polyester reclaimed material and polyester oligomer melt is 0.1:1, and catalyst is tetra-n-butyl titanate, and the metal element quality in catalyst is lower than polyester Calculating the mass of the polymer melt, the content of the catalyst is 50ppm; the temperature of the reactive melt blending is: the temperature of the twin-screw feed section is 260°C, the temperature of the twin-screw compression section is 275°C, the temperature of the homogenization section is 275°C, and the time is 5min. The atmosphere is nitrogen;

[0073] 2) The preliminary depolymerization m...

Embodiment 3

[0082] A method for recycling recycled polyester, the steps are as follows:

[0083] 1) Add polyester oligomer melt with a moisture content of 80ppm, a catalyst and an average degree of polymerization of 4 polyester oligomers into a twin-screw extruder for reactive melt blending, and obtain an average degree of polymerization of The preliminary depolymerization melt of 30, wherein, the mass ratio of polyester reclaimed material and polyester oligomer melt is 3:1, and catalyst is tetraisopropyl titanate, and the metal element quality is lower than polyester in the catalyst Calculated by polymer melt mass, the content of catalyst is 10ppm; the temperature of reactive melt blending is: the temperature of twin-screw feed section is 275°C, the temperature of twin-screw compression section is 300°C, the temperature of homogenization section is 295°C, and the time is 1min. The vacuum environment where the gauge pressure inside the screw is 0.1KPa;

[0084] 2) The preliminary depolym...

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Abstract

The invention relates to a polyester reclaimed material recycling method. First a polyester reclaimed material and polyester oligomer melt undergo reaction melt blending to obtain preliminary depolymerization melt, the preliminary depolymerization melt is mixed with ethylene glycol to perform alcoholysis reaction to obtain deep depolymerization melt, the deep depolymerization melt is filtered and then undergoes TVOC desportion and cracking functional group restoration in a vertical reactor to obtain a low TVOC content polyester oligomer melt with the TVOC content smaller than 20 ppm, the low TVOC content polyester oligomer melt undergoes condensation polymerization to obtain low TVOC content regenerative polyester melt, and finally the low TVOC content regenerative polyester melt enters a melt cooling pelleting system to obtain a regenerative polyester chip. The method is moderate in overall process length and process control difficulty and has high efficiency, and the content of TVOC, nonylphenol and an isomeride thereof in the finally obtained regenerative polyester chip is low.

Description

technical field [0001] The invention belongs to the field of regeneration of waste polyester, and relates to a recycling method of recycled polyester. Background technique [0002] Polyethylene Terephthalate (PET, polyester for short) is a widely used synthetic polymer material. In 2015, the global PET output exceeded 40 million tons, second only to polyolefin, and is the most important synthetic fiber. And the leading material used in the field of food packaging (accounting for more than 80%). However, as a non-degradable petroleum-based synthetic polymer material, the social reserves of polyester waste products are also very large, especially waste polyester textiles with complex types of impurities and high content are increasing at a rate of one million tons every year, but currently The recycling rate is less than 3%, and the resulting waste of petrochemical resources and solid waste pollution are becoming increasingly serious. Therefore, the high-efficiency and high-...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08G63/183C08G63/78C08J11/24
CPCC08G63/183C08G63/78C08J11/24C08J2367/02C08L67/02Y02W30/62
Inventor 陈烨王华平王朝生王少博吉鹏张玉梅
Owner DONGHUA UNIV
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