▎ 摘　　要

NOVELTY - Fire-retardant high tenacity carbon fiber composite comprises 50-60 pts. wt. polyacrylonitrile, 20-30 pts. wt. single-layer graphene powder, 8-15 pts. wt. bacterial cellulose, 5-10 pts. wt. methyl methacrylate, 5-10 pts. wt. 1,6-dibromohexane, 30-40 pts. wt. thermosetting resin, 1-5 pts. wt. nano magnesium hydroxide and 3-6 pts. wt. nano aerogel. USE - Fire-retardant high tenacity carbon fiber composite for overhead transmission conductor. ADVANTAGE - The fire-retardant high tenacity carbon fiber composite has high toughness and good flame-retardant property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing fire-retardant high tenacity carbon fiber composite, which involves: (A) carrying out superfine grinding on bacterial cellulose, adding distilled water under stirring; (B) mixing with a single-layer graphene powder solution under stirring for 10-12 hours; (C) carrying out ultrasonic treatment for 30-60 minutes; (D) carrying out sample application on a copper mesh; (E) drying at 40 degrees C; (F) carrying out film coating by using a vacuum film coating system to obtain bacterial cellulose-graphene composite material; (G) dispersing the bacterial cellulose-graphene composite material in methyl methacrylate; (H) mixing the methyl methacrylate with polyacrylonitrile powder and 1,6-dibromohexane; (I) isolating air at 20-25 degrees C; (J) heating and dissolving under a stirring state to obtain a spinning solution; (K) filtering the spinning solution in a metering manner; (L) performing primary fiber formation in a solution containing ethanol; (M) performing drafting, water washing, oiling, drying and winding to obtain protofilaments; (N) carrying out preoxidation and carbonization treatment on the precursor to obtain carbon fiber; (O) mixing thermosetting resin, nano magnesium hydroxide and nano aerogel; (P) adding carbon fiber to obtain a preformed material; and (Q) carrying out stranding, coating, stranding and heat treatment to obtain the carbon fiber composite material.