▎ 摘　　要

NOVELTY - Material comprises 100 pts. wt. ethylene-vinyl acetate copolymer, 20-50 pts. wt. maleic anhydride grafted polypropylene, 20-50 pts. wt. tung oil, 10-20 pts. wt. graphene nanofibers, 5-10 pts. wt. azo-dimethylamide AC, 10-20 pts. wt. flame retardant, 5-9 pts. wt. initiator, 8-12 pts. wt. stearic acid, and 8-12 pts. wt. octyl epoxide oleate. USE - Material for fire-retardant sealing of cable incoming lines in substation or in electric field packaging. ADVANTAGE - The material has high closed cell ratio, good temperature resistance resistance, small compressive deformation, excellent flame retardancy and antistatic property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a material suitable for fire-retardant sealing of cable entry in a substation, which involves: (A) adding graphene nanofibers to concentrated sulfuric acid and stirring at 60 degrees C for 1-3 hours to obtain acidified graphene nanofibers; (B) ading ethylene-vinyl acetate (EVA), maleic anhydride grafted polypropylene, tung oil, acidified graphene nanofibers, epoxidized soybean octyl ester, stearic acid are to an internal mixer and kneading at 100-150 degrees C for 10 minutes, and uniformly mixing; (C) further adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide, after 5 minutes; (D) pouring material and then opening at 80-90 degrees C to prepare a rubber mixture; and (E) laminating and compounding rubber compound, and putting into a mold for foam vulcanization, and foaming at 160-190 degrees C for 20 minutes to obtain the material.