Strippable semi-conductive shielding material for ethylene propylene rubber cable

Abstract

The invention discloses a strippable semi-conductive shielding material for an ethylene propylene rubber cable. The shielding material is prepared by mixing the following raw materials in part by weight: 70 parts of ethylene vinyl acetate, 30 parts of chlorinated polyethylene, 50 to 70 parts of conductive carbon black, 5 to 15 parts of coarse-particle carbon black, 5 to 10 parts of metal oxide, 20 to 40 parts of mineral filler, 3 to 20 parts of dispersing agent, 2 to 6 parts of cross-linking agent, 4 to 6 parts of cross-linking aid, 2 to 5 parts of anti-ageing agent and 15 to 20 parts of plasticizer. The defects that the shielding material has overhigh volume resistivity, and insufficient adhesion with an ethylene propylene insulation layer, and is difficult to strip, the shielding material and the ethylene propylene insulation layer cannot be synchronously vulcanized, and the like in the prior art are overcome, and the strippable semi-conductive shielding material for the ethylene propylene rubber cable has high semi-conductivity, high extrusion processability, and moderate adhesion with the insulation layer, is easy to strip and has a vulcanization rate equivalent to that of ethylene propylene rubber.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a peelable semiconductive shielding material for ethylene-propylene rubber cables. Background technique [0002] Power cable semi-conductive shielding material prevents partial discharge by uniform electric field distribution in the insulating layer, improves the electric strength of the cable, and improves the service life of the cable. Semi-conductive shielding materials for ethylene-propylene rubber cables are widely used in mining medium-voltage rubber-sheathed cables, marine cables, and medium-voltage rubber-sheathed power cables. [0003] To make the shielding material semi-conductive, a large amount of semi-conductive carbon black should be added to the base material. In the early days, ethylene-propylene rubber, chlorinated polyethylene, and natural styrene-butadiene rubber were used as base materials. The above-mentioned materials have high molecular weigh...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that when EVA is used as the base material, the volume resistance of the shielding material is too high, the adhesion force with the ethylene-propylene insulating layer is not enough, it is not easy to peel off, and the ethylene-propylene insulating layer cannot be vulcanized synchronously, resulting in delamination or blistering. To solve the technical defects of ethylene-propylene rubber cables, provide a peelable semi-conductive shielding material for ethylene-propylene rubber cables with good semi-conductivity, moderate adhesion to the insulating layer, easy peeling, and vulcanization speed equivalent to that of ethylene-propylene rubber.

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