Water tree-resistant polyethylene insulated cable material and preparation method thereof

Abstract

The invention discloses a water tree-resistant polyethylene insulated cable material and a preparation method thereof. The cable material is prepared by the following raw materials in parts by weight: 70-80 parts of low-density polyethylene, 10-15 parts of maleic anhydride grafted EVA (ethylene vinyl acetute), 5-10 parts of maleic anhydride grafted POE (polyolefin elastomer), 0.5-1.5 parts of sorbitol, 2-3 parts of polyethylene glycol, 2-3 parts of dicumyl peroxide, 0.4-0.6 parts of antioxidant DLTP (dilauryl thiodipropionate), 3-4 parts of triallyl isocyanurate, 2-3 parts of polydimethylsiloxane and the like. According to the cable material and the method, maleic anhydride grafted EVA and maleic anhydride grafted POE with good compatibility with low-density polyethylene are added to improve a polyethene structure, and sorbitol, polyethylene glycol, polydimethylsiloxane and the like are added to inhibit water tree formation, so that the water tree aging resistance and physical and mechanical properties of the polyethylene cable material are improved obviously; a technical bottle neck of water tree growth of the cable insulation layer is solved; the service life of a cable is prolonged; and the cable safety during use is improved.

Description

technical field [0001] The invention relates to a cable material and a preparation method thereof, in particular to a water tree-resistant polyethylene insulated cable material and a preparation method thereof. Background technique [0002] Polyethylene cables have become the mainstream of power cables due to their excellent electrical properties, large transmission capacity, good heat resistance, easy bending, simple accessory joints, and convenient installation and laying. The effect of chemical and other factors will cause aging, especially the phenomenon of water tree aging, which greatly affects the reliability of polyethylene cables for long-term use, and makes the cables enter the aging period ahead of time, thus laying a major hidden danger for the safe operation of the power grid. Contents of the invention [0003] The object of the present invention is to provide a water-tree-resistant polyethylene insulating cable material and a preparation method thereof, impro...

AI Technical Summary

Problems solved by technology

[0002] Polyethylene cables have become the mainstream of power cables due to their excellent electrical properties, large transmission capacity, good heat resistance, easy bending, simple accessory joints, and convenient installation and laying. The effect of chemical and other factors will cause aging, especially the phenomenon of water tree aging, which greatly affects the long-term reliability of polyethylene cables and makes the cables enter the aging period ahead of time, thus laying a major hidden danger for the safe operation of the power grid.

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