90 DEG C thermoplastic halogen-free low-smoke flame-retardant polyolefin sheath material and preparation method thereof

The invention discloses a 90 DEG C thermoplastic halogen-free low-smoke flame-retardant polyolefin sheath material and a preparation method of the sheath material. The material is prepared from the following raw materials in parts by weight: 20-40 parts of ethylene-vinyl acetate copolymer, 20-40 parts of linear low-density polyethylene, 2-10 parts of high-density polyethylene, 20-40 parts of metallocene ethylene-octylene copolymer, 10-15 parts of maleic anhydride grafted metallocene linear low-density polyethylene copolymer, 58-73 parts of aluminum hydroxide, 20-25 parts of modified magnesium hydroxide, 64-84 parts of synergistic flame retardant, 2-3 parts of coupling agent, 1-4 parts of lubricant and 1-1 part of antioxidant. 3 parts of a coloring agent and 2-7 parts of a coloring agent; wherein the synergistic flame retardant comprises lithium oxide. The matrix resin has low temperature, mechanical properties and cracking resistance. In the aspect of flame retardance, a large amount of synergistic flame reta