▎ 摘　　要

NOVELTY - Film comprises 90-98.5 pts. wt. low density polyethylene, 0.1-5 pts. wt. double bond functionalized graphene oxide (I), 0.5-2.5 pts. wt. plasticizer, and 0.5-2.5 pts. wt. antistatic agent. USE - Film used for large-area industrial preparation, food packaging and electronic packaging. ADVANTAGE - The film has high barrier property and great market prospect, and prepared in simple manner. DETAILED DESCRIPTION - Film comprises 90-98.5 pts. wt. low density polyethylene, 0.1-5 pts. wt. double bond functionalized graphene oxide of formula (I), 0.5-2.5 pts. wt. plasticizer, and 0.5-2.5 pts. wt. antistatic agent. R1=Hydrogen, methyl, ethyl; R2=Hydrogen, methyl; R3=methyl, ethyl, methoxy, ethoxy; R4=methoxy, ethoxy; and n=1 and 2. An INDEPENDENT CLAIM is included for a method for preparing film, which involves: (A) adding graphene oxide in 15-30 times ethanol solution, dispersing for 10-15 minutes, adding 0.5-2 times silane coupling agent with double linkage functional group, dispersing for 0.5-1.5 hours, heating at 60-65 degrees C in oil bath, stirring for 6-10 hours, centrifuging, washing, freezing and drying to obtain double bond functionalized graphene oxide; (B) adding 90-98.5 pts. wt. low density polyethylene, 0.1-5 pts. wt. double bond functionalized graphene oxide, 0.5-2.5 pts. wt. plasticizer, and 0.5-2.5 pts. wt. antistatic agent, and drying at 105-120 degrees C to obtain polyethylene functional granules; (C) melting polyethylene functional granules at 170-190 degrees C, extruding into sheet-like fluid, and cooling at 25-35 degrees C to form glassy surface; (D) subjecting glassy surface to longitudinal stretching by pre-heating at 70-90 degrees C, stretching at 85-100 degrees C, and heating at 90-100 degrees C; and (E) subjecting longitudinal stretching product to transverse stretching by pre-heating at 105-125 degrees C, stretching at 95-115 degrees C, heating at 110-130 degrees C, and cooling to obtain film.