▎ 摘　　要

NOVELTY - Barrier flame-retardant polyolefin plastic packaging material comprises 88-96 pts. wt. polyolefin and 4-12 pts. wt. macromolecule crosslinked network structure capacity graft copolymer, where the graft polymer is obtained by melting and reacting carboxylated polyethylene graft oxide graphene pentaerythritol phosphate under the action of isocyanate catalyst. USE - Barrier flame retardant polyolefin plastic packaging material. ADVANTAGE - The barrier flame-retardant polyolefin plastic packaging material provides more than 38 Mega Pascal tensile strength, more than 30 % limit oxygen index, vertical combustion through UL-94V-0 grade, and has good gas barrier property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method of barrier flame retardant polyolefin plastic packaging material, involving: a. taking the polyolefin, the macromolecule crosslinked network structure capacity graft copolymer, selectively adding the additive after mixing uniformly, directly injection moulding, where injection moulding process parameters are as follows: the temperature of the die head is 220-230℃, the temperature range of the I-VII region is 190-230℃, and the rotating speed of the screw is 110-150 rotations/minute.