Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for separating recycled polyester from waste polyester raw material

A technology of recycled polyester and waste polyester, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of depolymerization rate reduction, foam particle size, etc., to achieve increased yield, high specific surface area, reduced energy consumption and The effect of production costs

Active Publication Date: 2020-01-31
宁波大发新材料有限公司
View PDF8 Cites 8 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for separating recycled polyester from waste polyester raw material

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of waste polyester recycling, and particularly relates to a method for separating and acquiring recycled polyester from a waste polyester raw material. The method for separating and acquiring recycled polyester from the waste polyester raw material comprises the following steps: 1) preparing a foam material from recycled and classified polyester; 2) carrying outmelt granulation in a double-screw extruder, introducing a physical or chemical foaming agent in a granulation process, and forming micro holes in the surfaces and the interiors of the waste polyesterparticles after the waste polyester particles pass through a cooling water tank so as to obtain waste polyester particles containing micropores; 3) separating easily-soluble impurities including spandex and chinlon from the waste polyester particles containing the micropores by using a dissolving agent; 4) subjecting the waste polyester particles and ethylene glycol in proportion to depolymerization under the action of a catalyst, and carrying out filtering to obtain a high-purity waste polyester depolymerization solution; and 5) sending a prepared depolymerization product to a polycondensation kettle for pre-polycondensation, and carrying out final polycondensation so as to obtain a finished product. According to the method, the micropore-containing waste polyester prepared through the foaming technology can be efficiently depolymerized, and then the high-quality regenerated polyester is prepared, so high-valued recycling of the waste polyester is realized.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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