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A method of making polyester irregular granules by using polyester waste

A technology of irregular and particulate matter, which is applied in the field of waste plastic recycling, can solve the problems of product performance degradation, achieve the effect of improving intrinsic viscosity, improving mechanical properties, and ensuring the supply of raw materials

Active Publication Date: 2020-03-03
山东滨州波涛化纤制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved in the present invention is the problem that the product performance will be reduced when polyester waste is directly applied to product manufacturing.

Method used

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  • A method of making polyester irregular granules by using polyester waste

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Embodiment 1

[0024] The present embodiment provides a kind of method that utilizes polyester waste to make polyester irregular particle, comprises the following steps:

[0025] (1) Cutting and crushing.

[0026] Cut and crush the recovered polyester waste into fragments with a length of 10-50cm, wash with hot water at 90°C, and dry at 120-140°C for 7-10 hours under a vacuum of -0.95MPa to obtain a moisture content of less than 65 ppm dry fines.

[0027] (2) Screw extrusion.

[0028] The dry crushed material obtained in step (1) is fed into the feeding port of the parallel twin-screw extruder (Zhejiang Jinhu Plastic Machinery Co., Ltd.) through the front conveying device. After shearing, stirring, pressurizing, extruding, tearing and heat treatment, the polyester is extruded at the front of the screw and pelletized. Wherein the heating temperature is controlled at about 270°C. 6 additional high-strength bolts are set at the front end of the screw to facilitate the control of the crushin...

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Abstract

The invention discloses a method for preparing irregular polyester particles by using polyester waste, which is characterized by comprising the following steps: (1) cutting and pulverizing: cutting the polyester waste into polyester scrap and cleaning the polyester scrap; (2) screw extruding: performing screw extruding on the polyester scrap obtained in the step (1) to obtain polyester particles;3) liquid phase viscosity increase: feeding the polyester particles obtained in the step 2) into a liquid phase polymerization system, and performing liquid phase polycondensation under vacuum to increase viscosity to obtain a high viscosity polyester melt; 4) extrusion molding: performing fine filtration on the high-viscosity polyester melt, and then performing extrusion cooling molding in an extruder to obtain the irregular polyester particles. The intrinsic viscosity of the obtained polyester particles can be improved, the mechanical properties of the product produced by the polyester particles can be improved, the source of available polyester waste is wide, and the supply of raw materials can be ensured.

Description

technical field [0001] The invention relates to the technical field of recycling waste plastics, in particular to a method for making irregular polyester particles from polyester waste. Background technique [0002] As the country banned the import of foreign waste plastics on January 1, 2018 and the strengthening of national environmental protection policies led to a sharp increase in the demand for dust-proof nets, domestic waste polyester bottles have been far from meeting the needs of production and have soared all the way. Demand exceeds supply. Polyester mesh used in waste buildings, polyester cloth heads, waste silk produced in polyester spinning, leftovers (waste silk) produced by texturing machines, water jet looms, warp knitting machines, etc., wigs, zipper monofilaments Polyester (PET) waste produced in industrial production and civil production is used as raw material to replace waste plastic bottles imported from abroad. [0003] However, when waste polyester ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00B29B17/04B29B11/10B29C48/40B29C48/92B29C48/505B29C48/25C08J3/12C08L67/00
CPCY02W30/62
Inventor 邢光波李军
Owner 山东滨州波涛化纤制品有限公司
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