Low smoke zero halogen flame retardant material for high voltage cable jacket

Abstract

The invention discloses a low smoke zero halogen flame retardant material for a high voltage cable jacket. The low smoke zero halogen flame retardant material comprises the following components in percent by weight: 10-20 percent of metallocene polyethylene, 2-5 percent of ethylene vinyl acetate copolymer with a melt index of 2-8, 10-15 percent of acrylic acid grafted high density polyethylene, 20-30 percent of magnesium hydrate as an inorganic flame retardant, 30-40 percent of aluminum hydroxide as an inorganic flame retardant, 20-30 percent of organosilicone, 0.5-1 percent of molybdenum disulfide, 0.2-1 percent of 172 silane coupling agent, 0.5-1 percent of an antioxygen and 1-2 percent of a lubricating agent. By adopting effective matching of materials of a compatilizer acrylic acid grafted high density polyethylene, special modified polyethylene metallocene polyethylene, ethylene vinyl acetate copolymer and the like of a halogen-free flame retardant material, the mechanical strength and the hardness of the low smoke zero halogen flame retardant material are improved; through adding a silicon series lubricating agent and a molybdenum series lubricating agent in a material formula system, lower friction coefficient is realized on the surface of the low smoke zero halogen flame retardant material, and the abrasion resistance of the cable jacket can be effectively improved through good mechanical strength and wear-resistant property of the low smoke zero halogen flame retardant material; and the inorganic flame retardants are coupled by adopting the 172 silane coupling agent, so that the caking property of the jacket material and the graphite or conductive polyethylene layer material on the surface of the jacket material is good, the conductive material is prevented from separating, partial discharge current of a cable can not be effectively released, and the high-voltage cable is effectively used.

Description

Technical field [0001] The present invention involves low -pressure cable guards for low smoke and halogen -free flame retardant materials. Background technique [0002] Due to high -voltage electric cables due to high -voltage electric field effects and mechanical protection needs, plastic guards are required on the outer layer of the cable. Usually the shestor material of high -voltage power cables is made of black polyethylene material, and the appearance is coated with conductive graphite or conductive polyethylene to prevent it from preventing the appearance of conductive graphite or conductive polyethylene to preventHigh -voltage sensing voltage breakdown and reduced surface sensing voltage.However, with the underground layout of the urban high -voltage grid line, the cable is required to have a low smoke -free flame retardant function. Its protective cover must be made of low smoke and halogen -free black polyethylene material.The flame retardant cover material usually use...

AI Technical Summary

Problems solved by technology

However, due to the low mechanical strength and hardness of the ethylene vinyl acetate copolymer material, the material has low mechanical strength and poor wear resistance, resulting in damage to the cable surface sheath during the installation and laying of the cable, especially for large cross-section cables. Once the cable sheath is broken, it may cause the instability of the power grid system, and the cable body will be subjected to various damages, which cannot effectively protect the effective operation of the cable; moreover, the existing low-smoke, halogen-free and flame-retardant sheath materials have poor adhesion, resulting in The conductive graphite layer or conductive polyethylene layer on the surface will fall off, so that the partial discharge current of the cable cannot be effectively released, affecting the effective use of high-voltage cables