▎ 摘　　要

NOVELTY - Cast polypropylene film comprises first layer including 79.5-89 pts. wt. random copolymer polypropylene, 5-7 pts. wt. organic boron non-ionic active agent, 0.5-1 pts. wt. toughening agent, 1-3 pts. wt. adhesion promoter, 2-5 pts. wt. light shielding agent, 5-10 pts. wt. graphene powder and 2-5 pts. wt. anti-aging agent; second layer including 100 pts. wt. copolymerized polypropylene; and third layer including 88-93 pts. wt. random copolymer heat-sealing polypropylene, 2-5 pts. wt. adhesion promoter, 5-10 pts. wt. silicon carbide, 5-10 pts. wt. glass fiber and 5-7 pts. wt. anti-aging agent. USE - The cast polypropylene film is useful for aluminum plastic film. ADVANTAGE - The method includes addition of toughener, anti-aging agent, graphene powder and glass fiber to improve the toughness, elongation at break and right-angle tearing load and improve physical properties of CPP film. The produced CPP film increases the service life and practicality of the plastic. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing the cast polypropylene film, comprising (a) adding the first layer raw material, second layer raw material and third layer raw material into a drying container, (b) heating by steam, when the temperature reaches 90 degrees C, opening a vacuum pump to dry for 30 minutes, stopping the vacuum pump, filling nitrogen, and taking the sample for moisture content test, (c) mixing each component of first layer, second layer and third layer, and uniformly dispersing by a high speed mixer, (d) adding the mixed raw materials into three extruders with the same specification, and controlling the heating temperature of the extruder to 230-240 degrees C and the heating pressure at 16-20MPa, (e) injecting the extruded film layer into a composite mold head, compositing and layering the material output by the three extruding machines in the mold head, adjusting the corresponding product thickness by the mold head, and outputting the composite sheet, and (f) cooling and forming the composite sheet by a casting roller, automatically measuring thickness and adjusting, performing corona treatment, using a trimming and rolling device for trimming and rolling, and cutting to obtain cast polypropylene film.