▎ 摘　　要

NOVELTY - Flame retardant sheath material comprises 90-94 pts. wt. styrene ethylene butadiene styrene block copolymer, 65-68 pts. wt. stearic acid, 29-31 pts. wt. polypropylene, 21-23 pts. wt. polypropylene grafted maleic anhydride, 3-4 pts. wt. antioxidant B215, 81-83 pts. wt. magnesium hydroxide, 4.3-5 pts. wt. graphene, 1.6-1.7 pts. wt. silane coupling agent A-171, 8-9 pts. wt. absolute ethyl alcohol, 6-7 pts. wt. molybdenum disulfide, 2-3 pts. wt. erucic acid amide, 7-9 pts. wt. aluminum hydroxide, 13-14.5 pts. wt. carborundum, 2-3 pts. wt. silicate and 2-3 pts. wt. emulsified asphalt. USE - Flame retardant sheath material. ADVANTAGE - The flame retardant sheath material is safe and eco-friendly, has scientific and reasonable proportion, high tensile strength, good thermal stability, flexible and durable, good compatibility with the substrate, and good flame retardant effect, and reduces the production cost and time. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing flame retardant sheath material, which involves: (A) drying magnesium hydroxide in a blast drying box at 110 degrees C for 4 hours, adding silane coupling agent A-171 into absolute ethyl alcohol, stirring with 500 revolution for 30 minutes into high speed mixer, adding graphene, stirring with 2000 revolution per minute for 30 minutes at normal temperature, raising the temperature to 60 degrees C, and drying at 110 degrees C for 3 hours to obtain compound flame retardant; (B) mixing styrene ethylene butadiene styrene block copolymer, polypropylene, polypropylene grafted maleic anhydride, placing in blast drying box at 80 degrees C for 4 hours, mixing styrene ethylene butadiene styrene block copolymer and stearic acid, placing into high speed mixer with 1000 revolution per minute for 20 minutes, standing for 12 hours, swelling styrene ethylene butadiene styrene block copolymer in stearic acid to obtain oily styrene ethylene butadiene styrene block copolymer polypropylene, placing polypropylene grafted maleic anhydride into double-roller temperature at 170 degrees C, plasticating for 10 minutes, adding oily styrene ethylene butadiene styrene block copolymer polypropylene and antioxidant B215, mixing for 20 minutes, crushing and drying in blast drying box for 2 hours to obtain mixed material; (C) drying carborundum in the oven at 80 degrees C for 1 hour, spraying emulsified asphalt on dried silicon carbide surface, placing into stirring kettle for stirring with 600 revolution per minute for 30 minutes, pouring into double-screw extruder for extruding with 200 revolution per minute for 10 minutes, adding silicate and molybdenum disulfide, stirring for 15 minutes, extruding and pelletizing to obtain mixed material; and (D) mixing complex flame retardant, base material, mixture and other remaining component into high-speed mixer at 170 degrees C for 20 minutes with 500 revolution per minute, discharging material into flat vulcanizing machine, pressing at 180 degrees C, cooling at room temperature, crushing into particles, extruding into double screw extruder, and drying at 80 degrees C for 4 hours to obtain product.