▎ 摘　　要

NOVELTY - A high flame-retardant polypropylene polymer comprises 100 pts. wt. polypropylene, 3-5 pts. wt. flax fiber, 10-15 pts. wt. toughener, 3-6 pts. wt. hexagonal boron nitride, 2-3 pts. wt. graphene, 1-3 pts. wt. glass fiber, and 5-10 pts. wt. flame retardant comprising tricresyl phosphate and melamine at mass ratio of 1:2-4. USE - High flame-retardant polypropylene polymer. ADVANTAGE - The polymer has improved flame retardant property and strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of polymer comprising sending flax fibers to a shearing machine for shearing to form flax short fibers and grinding glass fibers into powder-like glass fiber powder; sending polypropylene, toughener, hexagonal boron nitride, grangphene, flame retardant, flax short fiber, and glass fiber powder into a high-speed mixer, fully stirring, and mixing; melting, extruding, cooling, pelletizing by a twin-screw extruder and injection molding.