Ultraviolet light crosslinking low-smoke zero-halogen flame-retardant cable material and preparation method thereof

Abstract

The invention provides an ultraviolet light crosslinking low-smoke zero-halogen flame-retardant cable material. The cable material comprises polyolefin, a compatilizer, an inorganic flame retardant, an organic phosphorus-nitrogen-containing flame retardant, a flame-retardant synergist, a photoinitiator, an assistant crosslinker, a surfactant, an antioxidant and a lubricant, wherein polyolefin contains low-density polyethylene, an ethylene-octylene copolymer and an ethylene-vinyl acetate copolymer in the weight proportion being (10-25):(20-35):(55-65); the compatilizer is polyethylene for grafting of maleic anhydride; the inorganic flame retardant is selected from magnesium hydroxide and aluminum hydroxide; the organic phosphorus-nitrogen-containing flame retardant contains polyphosphoric acid, pentaerythritol and melamine in the weight proportion being (10-20): (4-8): (15-30); the flame-retardant synergist contains zinc borate and/or polydimethylsiloxane. The cable material has good thermal resistance and anti-aging performance, can be used at the temperature of 125 DEG C for a long time and is excellent in comprehensive mechanical performance and better in flame retardance.

Description

technical field [0001] The invention belongs to the field of low-smoke halogen-free flame-retardant cable material, and particularly relates to an ultraviolet light cross-linked low-smoke halogen-free flame-retardant cable material and a preparation method thereof. Background technique [0002] Polyolefin materials are widely used in the field of wires and cables because of their excellent electrical properties, low temperature resistance and comprehensive mechanical properties. With the increasing requirements for flame retardant wire and cable, the application of halogen-free flame retardant polyolefin materials is gradually becoming the mainstream. In order to make polyolefin materials have more excellent electrical properties, higher long-term use temperature, corrosion resistance, pressure resistance, mechanical strength, etc., cross-linking technology is widely used in polyolefin materials. [0003] At present, there are three general cross-linking methods for the pre...

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Problems solved by technology

Among them, the disadvantages of the peroxide chemical cross-linking method are its low production efficiency, complicated process, high energy consumption, and high product rejection rate; the silane cross-linking method involves hydrolysis reaction, complex process, long cross-linking cycle, and wire Cables have poor stability, low voltage and temperature resistance levels, and are not suitable for highly filled halogen-free flame-retardant wires and cables; high-energy radiation cross-linking method requires large equipment investment, complicated operation and maintenance, and harsh protection conditions, and because of its process characteristics, it is only suitable for Make wires with thinner walls, but the radiation uniformity of thick-walled wires is not good

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