Preparation and Application of Insulating Cross-linked Polyethylene Composition for Magnetic Suspension Feeder Cable

Abstract

The invention discloses a preparation and an application of an insulating cross-linked polyethylene composition applied to a magnetic levitation feeder cable. The composition disclosed by the invention comprises the following ingredients: 100 parts of polyethylene, 5-10 parts polar copolymer, 5-10 parts of POE (Polyolefin Elastomer), 0.02-2.0 parts of antioxidant and 1.5-2.2 parts of peroxidation cross-linking agent. The composition is prepared by feeding the ingredients into a reciprocating type single screw rod extruder and a single screw rod extruder through a weightlessness feeding system, mixing at 100-115 DEG C, shearing, extruding, granulizing in a spraying granule cutting mode, cooling, centrifugal dewatering, boiling and drying. The composition disclosed by the invention maintains the electric property of the cross-linked polyethylene, improves the softness and can meet the requirements on winding and embedding the magnetic levitation feeder cable; the low-temperature resistance of the composition is improved, and the cable does not crack under the low-temperature impact of minus 76 DEG C, so that on-site cable accidents caused by water-tree under double actions of a humid environment and an electric field; and meanwhile the extruding speed is high when the cable is machined, the manufactured cable is smooth and soft in surface and is better in comprehensive performance.

Description

technical field [0001] The invention relates to an insulating material for a magnetic suspension feeder cable, in particular to the preparation and application of an insulating crosslinkable polyethylene composition for a magnetic suspension feeder cable. Background technique [0002] Medium and high voltage maglev feeder cables are required to have a certain degree of flexibility in order to meet the requirements of winding and embedding. Therefore, the insulating layer is basically made of rubber materials such as EPDM, such as the medium voltage cable disclosed in Chinese patent CN1652261. 70-90% EPDM rubber and 10-30% EVA are blended and modified to make the insulating layer. Although the rubber insulating layer has good flexibility, its electrical properties are relatively poor, especially the dielectric loss and dielectric constant are too large, resulting in large transmission power loss. At the same time, general XLPE cable materials have the following defects: The ...

AI Technical Summary

Problems solved by technology

Although the rubber insulating layer has good flexibility, its electrical properties are relatively poor, especially the dielectric loss and dielectric constant are too large, resulting in large transmission power loss. At the same time, general XLPE cable materials have the following defects: The internal lubricity of the material is poor, requiring a higher processing temperature, which increases the hidden danger of pre-crosslinking of the cross-linked material, and causes more defects and cavities inside the material

Laying under the dual effects of southern humid environment and electric field will cause deterioration of the insulation inside, resulting in shortened service life of the cable

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