Self-assembled cast polypropylene (cpp) base film of aluminum-plastic film for new energy pouch batteries and preparation method thereof

A self-assembled cast polypropylene (CPP) base film of an aluminum-plastic film for new energy pouch batteries, comprising a self-assembled heat sealing layer, a support layer and a composite layer arranged in sequence;

• wherein a thickness of the CPP base film is 20 μm to 90 μm, and a thickness ratio of the self-assembled heat sealing layer, the support layer and the composite layer is (1-3):
• (4-8):
• (1-3);
• wherein the self-assembled heat sealing layer comprises, by weight percentage, 69% to 96% of ternary random copolymer polypropylene, 0% to 20% of binary random copolymer polypropylene, 3% to 6% of opening slipping agent and 1% to 5% of organic hybrid micro-nano thermal conductive material;
• wherein the organic hybrid micro-nano thermal conductive material is prepared by a sol-gel method using one or more of silicon dioxide, calcium carbonate, calcium silicate, and barium sulfate and an organic surface modifier, and a method for preparing the organic hybrid micro-nano thermal conductive material comprises:
• mixing the organic surface modifier with an inorganic nanomaterial at a mass ratio of 1:99 to 5:95, and then preparing by a sol-gel method, wherein a temperature is controlled at −10° C. to 120° C., a pressure is 1.0 MPa to 3.0 MPa, and a reaction time is 1 h to 10 h;
• and the organic surface modifier is one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent, and borate coupling agent;
• wherein the support layer comprises, by weight percentage, 50% to 90% of block copolymer polypropylene, 0% to 10% of binary random copolymer polypropylene, 0% to 10% of ternary random copolymer polypropylene, 5% to 10% of polyolefin elastomer, and 5% to 20% of acidified polypropylene;
• wherein the composite layer comprises, by weight percentage, 50% to 89% of binary random copolymer polypropylene, 5% to 15% of block copolymer polypropylene, 5% to 30% of acidified polypropylene, and 1% to 5% of vinyl acetate;
• and
• wherein the acidified polypropylene is maleic anhydride grafted modified polypropylene, with a grafting rate of ≥2%, and a melt index of 3-12 g/10 min.