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A recovery process of cross-linked polyethylene waste

A cross-linked polyethylene, waste technology, applied in the direction of plastic recycling, recycling technology, etc., can solve pollution, low efficiency and other problems, achieve huge economic benefits, protect the environment, and save resources

Active Publication Date: 2018-06-29
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a recovery process of cross-linked polyethylene waste, which can depolymerize cross-linked polyethylene in an environmentally friendly and efficient manner, so that the depolymerized polyethylene has high-temperature fluidity and processability, and can be directly applied to downstream product production , to solve the pollution and low efficiency of traditional treatment methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Crush the XLPE cable material waste into 2-4cm blocks or flakes through a pulverizer, and use a specially configured co-rotating twin-screw extruder. The basic configuration of the extruder is: screw diameter D = 65mm, length-to-diameter ratio L / D=72, motor power P=120KW, screw combination set to 8 cycles of alternating shear force. The processing conditions of the extruder are as follows: the highest temperature is 280° C., the screw speed is 600 rpm, and the die head pressure is 15 MPa. The cross-linked polyethylene can be depolymerized by the extruder to realize granulation. The properties of the material before and after granulation are shown in Table 1.

[0038] Table 1

[0039] performance parameters

Embodiment 2

[0041] The materials, equipment and processing technology are the same as those in Example 1, and the maximum processing temperature is set to 260°C. Cross-linked polyethylene can be granulated by a twin-screw extruder, and the performance parameters of the material are shown in Table 2.

[0042] Table 2

[0043] performance parameters

Embodiment 3

[0045] The materials, equipment and processing technology were the same as in Example 1, and the screw speed was set at 500rpm. Cross-linked polyethylene can be granulated by a twin-screw extruder, and the performance parameters of the material are shown in Table 3.

[0046] table 3

[0047] performance parameters

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PUM

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Abstract

The invention discloses recovery process for crosslinked polyethylene wastes. The process comprises the following steps: crushing the crosslinked polyethylene wastes and then adding the crushed wastes into an extruder, subjecting a molecular chain of the crosslinked polyethylene to depolymerization under the actions of high temperature and alternating shear so as to realize recycling, wherein an extrudision temperature of the extruder is 240 to 300 DEG C, and die pressure is 3 to 20 MPa; a screw of the extruder has a length-diameter ratio of 56 to 80 and a rotating speed of 400 to 1200 rpm, so shear line speed exerted on a material is more than 4 m / s; the alternation cycle of maintaining shear force of a screw combination of the extruder is 2 to 10 cycles; processing time of the material is more than 30s; and the extruder is a single-screw extruder or a double-screw extruder. The recovery process provided by the invention can depolymerize the crosslinked polyethylene with environmental protection and high efficiency and enables the depolymerized crosslinked polyethylene to have high mobility and machinability.

Description

technical field [0001] The invention relates to the field of recovery and regeneration of waste polymer materials, in particular to a recovery process of cross-linked polyethylene waste. Background technique [0002] Cross-linked polyethylene material, also known as XLPE, is prepared by chemical cross-linking (through oxide or silane cross-linking) or radiation cross-linking (irradiation agent plus radiation radiation), which has high mechanical strength, high and low temperature resistance and It has excellent creep resistance and is widely used in communications, power cable sheathing materials, XLPE hot water pipes, automotive and electrical components, and cross-linked foam materials. However, since XLPE is a kind of thermosetting material, its performance is completely different from that of thermoplastic materials. The material does not dissolve or melt, and because it has no processing fluidity, it is difficult to directly form recycled processing, whether it is chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/10C08L23/06
CPCY02W30/62
Inventor 雷华文韵豪李振华鲁阳陈建党
Owner ZHEJIANG UNIV