Semi-conductive shielding material for cross-linked polyethylene cables

Abstract

The invention relates to a semi-conductive shielding material for cross-linked polyethylene cables. The semi-conductive shielding material for cross-linked polyethylene cables is characterized by comprising the following components by mass: 45%-60% of an EVA material, 30%-40% of carbon black, 6%-10% of a plasticizer, 1%-2.5% of silane cross-linked POE, 0.1%-1% of an antioxidant, and 0.5%-2% of hydroxybenzenesulfonic acid and 12%-20% of tetraphenyl ethylene. The semi-conductive shielding material for cross-linked polyethylene cables is prepared by: conducting sequential feeding of the components and performing mixing, then conducting extrusion granulation by an extruder, and adding a cross-linking agent. The EVA material is a proportion adjustable copolymer of ethylene and vinyl acetate. The plasticizer comprises one or more of oil, paraffin, stearic acid, zinc stearate and polyethylene wax. The cable strength is improved to adapt to the low temperature working environment and the hightemperature resistance of the cables are improved.

Description

Technical field [0001] The invention relates to cable materials, in particular to a semi-conductive shielding material for cross-linked polyethylene cables. Background technique [0002] In the actual production process of traditional peroxide cross-linked semi-conductive shielding materials, there are many shortcomings: (1) Continuous use is prone to scorching; (2) There are many residues on the insulating surface; (3) When the ambient temperature is reduced When the temperature is below 10°C, the cable sheath is easy to be brittle and damaged; (4) For cables with heavy loads, the electric field around the cable is large during high-voltage transmission, and it will accumulate for a certain period of time to form a high temperature. The high temperature resistance of the existing cable is only 70°C, unable to adapt to the current long-distance high-voltage power transmission. Since semi-conductive shielding material is one of the components that must be used in medium and high-...

AI Technical Summary

Problems solved by technology

[0002] In the actual production process of traditional peroxide cross-linked semi-conductive shielding materials, there are many disadvantages as follows: (1) continuous use is prone to scorch; (2) there are many residues on the insulating surface; (3) when the ambient temperature drops When the temperature is below 10°C, the sheath of the cable is prone to embrittlement and damage; (4) For cables with large loads, the electric field around the cables is large during high-voltage transmission, and the accumulation of a certain period of time will form high working temperatures. The high temperature resistance value of existing cables is only 70°C, unable to adapt to the current long-distance high-voltage transmission