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A method for separating and obtaining recycled polyester from waste polyester raw materials

A technology of regenerated polyester and waste polyester, which is applied in the direction of plastic recycling and recycling technology, which can solve the problems of large foam particles and decreased depolymerization rate, achieve high specific surface area, increase yield, and accelerate depolymerization reaction speed effect

Active Publication Date: 2022-03-11
宁波大发新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these patents still do not solve the technical problem that the foam particles are relatively large, resulting in a significant decrease in the depolymerization rate.

Method used

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  • A method for separating and obtaining recycled polyester from waste polyester raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] After cleaning and drying the recycled and sorted polyester (PET) bottle flakes and polyester (PET) pulp blocks, they are melted and granulated in a twin-screw extruder. The heating temperature of each zone of the twin-screw extruder is 250°C, 260°C, 270°C, 280°C, 275°C, 275°C, 270°C, the feeding percentage of the screw is 15%, the rotation speed is 50rpm, the pressure is 3Mpa, micropores are formed The material chooses to add foaming agent AC, the mass ratio of foaming agent to waste polyester is 1:200, and the feeding position is the fourth heating zone of the screw. After the granulation is completed, the micropore formation is stable after passing through the cooling water tank.

[0048] The average cell diameter of the microporous waste polyester granules prepared by the microporous waste polyester granulation step is 85 μm, and the relative density is 0.35. For the average cell diameter test, the average value of 100 average cell diameters was continuously measure...

Embodiment 2

[0055] The recycled and sorted polyester (PET) film and polyester (PET) fiber products (curtains, carpets, clothing, etc.) are densified by thermal friction molding process at a temperature of 220°C, a pressure of 3MPa, and a time of 10 minutes. into foam. The foam is then melt-granulated in a twin-screw extruder. The heating temperature of each zone of the twin-screw extruder is 265°C, 270°C, 275°C, 280°C, 275°C, 270°C, 270°C, the feeding percentage of the screw is 30%, the screw speed is 65rpm, the pressure is 6Mpa, the micropore The foaming agent ABIN is selected as the forming material, and the mass ratio of foaming agent to waste polyester is 1:250, and the feeding method is mixed in the fourth heating zone of the screw.

[0056] The average cell diameter of the microporous waste polyester granules prepared by the microporous waste polyester granulation step is 82 μm, and the relative density is 0.55.

[0057] Put the waste polyester (PET) pellets containing micropores ...

Embodiment 3

[0063] After cleaning and drying the recycled and sorted polyester (PET) bottle flakes and polyester (PET) pulp blocks, they are melted and granulated in a twin-screw extruder. The heating temperature of each zone of the twin-screw extruder is 260°C, 270°C, 280°C, 285°C, 275°C, 270°C, 270°C, the percentage of screw feed is 45%, the speed is 45rpm, the pressure is 75Mpa, the screw feed The percentage is 45%, the screw speed is 65rpm, and the pressure is 8.5Mpa. The foaming agent DPT and foaming agent ADC are selected for the micropore formation, and the ratio is 1:1. The mass ratio of foaming agent to waste polyester is 1:500. The feeding method is mixed in the fourth heating zone of the screw, and the micropore formation is stable after the granulation is completed and passed through the cooling water tank.

[0064] The average cell diameter of the microporous waste polyester granules prepared by the microporous waste polyester granulation step is 75 μm, and the relative densi...

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Abstract

The application belongs to the field of waste polyester recycling, and in particular relates to a method for separating and obtaining recycled polyester from waste polyester raw materials. A method for obtaining regenerated polyester from waste polyester raw materials, the method includes the following steps: 1) foaming material made of recycled and classified polyester; 2) melting and granulating in a twin-screw extruder In the granulation process, a physical or chemical foaming agent is introduced, and after passing through the cooling water tank, micro holes are formed on the surface and inside of the waste polyester particles to obtain waste polyester pellets containing micro holes; 3) the waste polyester particles containing micro holes The waste polyester pellets are firstly separated from the soluble impurities of spandex and nylon with a dissolving agent; 4) Depolymerization is carried out with ethylene glycol in proportion under the action of a catalyst, and high-purity waste polyester depolymerization liquid is obtained by filtration; 5) Finally, the depolymerized product is sent to the polycondensation tank for pre-condensation, and the finished product is formed through final polycondensation. The waste polyester containing micropores prepared by the foaming technology can be efficiently depolymerized, and then high-quality regenerated polyester can be prepared to realize high-value recycling of waste polyester.

Description

technical field [0001] The application belongs to the field of waste polyester recycling, and in particular relates to a method for separating and obtaining recycled polyester from waste polyester raw materials. Background technique [0002] Polyethylene terephthalate (PET) is polymerized from terephthalic acid or dimethyl terephthalate and ethylene glycol. Due to its good physical and chemical stability and processability, it is widely used in textiles, clothing, decoration, food packaging and other fields. However, due to the strong chemical inertness of PET under natural conditions, it is difficult to be biodegraded, and a large amount of waste polyester has caused great pressure on the environment. Therefore, recycling waste polyester products can achieve effective recycling of resources and reduce environmental pollution. Pollution has become an important issue in the polyester industry. [0003] At present, there are mainly physical and chemical methods for recycling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/24B29B9/06B29C48/92C08G63/183C08G63/78C08L67/02
CPCC08J11/24C08G63/183C08G63/78B29B9/06B29C48/92C08J2367/02B29C2948/92704B29C2948/9259B29C2948/92885B29C2948/92971B29C2948/92514B29K2067/00Y02W30/62
Inventor 钱军马哲峰顾君郭学伟杜国强王秀华王勇
Owner 宁波大发新材料有限公司
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