Waste crosslinked polyethylene recovered material and recovery method thereof

A technology of cross-linked polyethylene and recycling methods, which is applied in the field of waste polymer recycling materials and its preparation, can solve the problems of difficult implementation and high equipment requirements, and achieve increased mechanical properties, excellent comprehensive properties, increased thermoplasticity and melt flow sexual effect

Inactive Publication Date: 2015-03-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they have the disadvantages of high equipment requirements and difficult implementation.

Method used

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  • Waste crosslinked polyethylene recovered material and recovery method thereof
  • Waste crosslinked polyethylene recovered material and recovery method thereof
  • Waste crosslinked polyethylene recovered material and recovery method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The waste peroxide cross-linked polyethylene pipes are mechanically crushed to 0.5-2cm particles, and then placed in a disc-type solid-phase force chemical reactor for grinding. During the grinding process, the cooling circulating water temperature is controlled at 5°C, and the grinding pressure is 50MPa. The grinding speed is 100 rpm, and the grinding is performed 30 times. The particle size of the obtained cross-linked polyethylene ultrafine powder is 500 mesh, and the gel content is 36.4%.

Embodiment 2

[0038] The waste silane cross-linked polyethylene cable material is mechanically crushed to 0.5-2cm particles, and then placed in a disc-type solid-phase force chemical reactor for grinding. During the grinding process, the cooling cycle water temperature is controlled at 30°C, and the grinding pressure is 10MPa. The milling speed is 1000rpm, and milling is performed 13 times. The obtained cross-linked polyethylene fine powder has a particle size of 290 mesh and a gel content of 52.4%.

Embodiment 3

[0040] The waste irradiated cross-linked polyethylene pipes are mechanically crushed to 0.5-2cm particles, and then placed in a disc-type solid-phase force chemical reactor for grinding. During the grinding process, the cooling cycle water temperature is controlled at 10°C, and the grinding pressure is 40MPa. The milling speed is 10 rpm, and milling is done 10 times. The obtained cross-linked polyethylene fine powder has a particle size of 320 mesh and a gel content of 50%.

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Abstract

The invention discloses a waste crosslinked polyethylene recovered material and a recovery method thereof. The waste crosslinked polyethylene recovered material comprises the following steps of crushing waste crosslinked polyethylene to obtain particles with sizes of 0.5-2cm, and grinding the particles by a solid-state mechanochemical reactor to obtain powder of 100-500 meshes, wherein in grinding, a cooling cycle water temperature is controlled in a range of 5-30 DEG C, grinding pressure is controlled in a range of 10-50MPa, a grinding rotation rate is controlled in a range of 10-1000rpm and grinding frequency is 5-30. A Soxhlet extraction device test result shows that the powder has gel content less than 60%. The recovery method can selectively cut out C-O bonds and Si-O bonds in waste crosslinked polyethylene, cut out cross bonds of a three dimensional crosslinking structure, change the original insoluble and non-melting characteristic, improve material thermoplastic and fusion fluidity, and provides thermoplastic processability for the waste crosslinked polyethylene recovered material. The waste crosslinked polyethylene recovered material can be processed to form high-value recovered materials and products with excellent performances by conventional thermoplastic processing processes such as extrusion and rolling.

Description

technical field [0001] The invention belongs to the technical field of waste polymer recycled materials and its preparation, and relates to a waste cross-linked polyethylene recycled material and a recycling method thereof. Background technique [0002] Cross-linked polyethylene (XLPE) is a polyethylene that forms a network-like three-dimensional structure through covalent bonds between polyethylene molecules. Compared with ordinary polyethylene, it has excellent electrical insulation properties, mechanical properties, wear resistance, creep resistance, dimensional stability and stress cracking resistance, etc. It is widely used in chemical industry, construction, automobile, machinery, electric power, packaging , agriculture and other industries, especially for the preparation of pipelines and insulation wire and cable. [0003] Due to the requirements for finished cross-linked polyethylene pipes or finished cross-linked polyethylene wires and cables and the particularity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/04B29B9/06
CPCY02W30/62
Inventor 白时兵王琪孙发森华正坤
Owner SICHUAN UNIV
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