Modified casting polypropylene film and oral liquid medicinal packaging composite film

The invention discloses a modified casting polypropylene film and an oral liquid medicinal packaging composite film, belongs to the technical field of medicine packaging, and solves the technical problems that various properties of an existing casting polypropylene film are greatly reduced after high-temperature cooking, and the high-temperature cooking resistance is poor. The modified casting polypropylene film comprises a graft polymer of polypropylene, maleic anhydride and beta-cyclodextrin, silicon carbide is adsorbed on the interface of the graft polymer, the silicon carbide is also coated in a barrel-shaped cavity structure of beta-cyclodextrin, the oral liquid medicinal packaging composite film comprises a polyester layer, an aluminum foil layer and a heat sealing layer, and the heat sealing layer is coated on the aluminum foil layer. The polyester layer and the aluminum foil layer are bonded through a binder, the aluminum foil layer and the heat sealing layer are bonded through a binder, and the heat