Crosslinked polyethylene carbon black cable material and preparation method thereof

Abstract

The invention discloses a crosslinked polyethylene carbon black cable material and a preparation method thereof. The crosslinked polyethylene carbon black cable material is prepared from the followingcomponents in parts by weight: 3 to 7 parts of montmorillonite, 1 to 2 parts of nanometer magnesia, 1 to 2 parts of nano silicon carbide, 1 to 3 parts of carbon black, 15 to 20 parts of a crosslinking agent, 70 to 80 parts of polyethylene and 10 to 20 parts of an antioxidant. Under the action of a direct current electric field, crosslinked polyethylene generates a large number of negative chargeswhich are from electron injection at a cathode, and the carbon black restrains charge particles in a cable to enable charges in the cable to be not accumulated, so that direct current can be prevented from breaking down the cable during transmission in the cable; moreover, the carbon black can be uniformly distributed in the cable; due to the nature, the carbon black can reflect most ultravioletrays to reduce the amount of the ultraviolet rays directly entering the cable. The nanometer magnesia and the nano silicon carbide can effectively improve the capacity of polyethylene of suppressing space charges, reduce the conductivity of the polyethylene and enhance the direct-current breakdown intensity of the polyethylene.

Description

technical field [0001] The invention relates to cables, in particular to a cross-linked polyethylene carbon black cable material and a preparation method thereof. Background technique [0002] At present, there are many cables exposed to the ground. Under the action of the sun, the polymers in the cables will be cracked and the surface of the cables will become rough or even cracked, eventually causing the cables to be damaged and causing safety hazards. [0003] The Chinese patent with publication number CN104194165A discloses a low-voltage power cable rubber material, which has heat aging resistance. [0004] However, this kind of cable is easy to cause polymer decomposition after ultraviolet radiation, so it needs to be improved. [0005] With the upgrading and transformation of China's urban power grids, the proportion of cable lines in urban distribution networks is increasing year by year, and cable accidents are also showing a trend of frequent occurrence. Cable over...

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Problems solved by technology

[0004] However, this kind of cable is easy to cause polymer decomposition after ultraviolet radiation, so it needs to be improved.

[0005] With the upgrading and transformation of China's urban power grids, the proportion of cable lines in urban distribution networks is increasing year by year, and cable accidents are also showing a trend of frequent occurrence. Cable overload will cause partial premature aging of cables and greatly shorten the service life of cables. , reducing the operational reliability of the cable