▎ 摘　　要

NOVELTY - High temperature resistant and heat-resistant polyethylene co-extrusion film comprises microfibrillated cellulose, graphene and polyethylene, where the microfibrillated cellulose is mutually bridged, and graphite. The vinylene is grafted on the polyethylene matrix and provided uniformly to form a three-dimensional network structure. USE - High temperature resistant and heat-resistant polyethylene co-extrusion film used to pipeline, film, monofilament, container, wire and cable. ADVANTAGE - The high temperature resistant and heat-resistant polyethylene co-extrusion film has excellent heat resistance and easy heat sealing performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a high temperature resistant and heat-resistant polyethylene co-extrusion film, which involves: a. carrying out acyl chloride modification to 3,5-di-tert-butyl-4-hydroxybenzoic acid with thionyl chloride to obtain 3,5-di-tert-butyl-4-hydroxybenzoyl chloride; b. adding microfibrillated cellulose to the deionized water solvent, ultrasonically dispersing evenly, and freeze-drying to obtain modified cellulose; c. adding epichlorohydrin and modified cellulose to the deionized water solvent, ultrasonically dispersing, adding sodium hydroxide to adjust the pH of the solution to 10-12, reacting at 60-90℃ for 6-9 hours, cooling, removing solvent by rotary evaporation, washing and drying to obtain epoxy functionalized cellulose; d. adding epoxy functionalized cellulose and aminated graphene to the deionized water solvent, ultrasonically dispersing, adding sodium hydroxide to adjust the pH of the solution to 9-11, reacting, cooling, centrifuging, washing and drying to obtain cellulose-modified graphene; e. adding cellulose-modified graphene to 1-butyl-3-methylimidazolium chloride ionic liquid with a mass fraction of 3-6%, ultrasonically dispersing, adding acid-binding agent pyridine, 3,5-ditert-butyl-4-hydroxybenzoyl chloride, ultrasonically dispersing uniformly, esterifying, cooling, centrifuging, washing and drying to obtain hindered phenol modified cellulose grafted graphene; and f. adding lubricant fatty acid, toughening agent fluorosilicone rubber, hindered phenol modified cellulose grafted graphene, polyethylene to absolute ethanol solvent, ultrasonically dispersing, removing solvent by rotary evaporation, placing in twin-screw extrusion extruded in the machine, then placing in an extrusion casting machine to cast a film to obtain a product.