Preparation method of high-toughness impact-resistant PET protective film

The invention relates to a preparation method of a high-toughness impact-resistant PET protective film, and belongs to the technical field of protective film preparation of electronic products. According to the preparation method, calcium hydroxide is used as a raw material, sucrose is adopted as a crystal form guiding agent, and carbon dioxide is introduced so as to produce a nano calcium carbonate material; and the nano calcium carbonate is modified by using distearyloxy isopropyl aluminate and octadecylamine, toughening treatment is conducted on the polymer by selecting methyl methacrylate,butadiene and styrene ternary polymer and utilizing the rigidity of the nano calcium carbonate and large quantities of chemical bonds which are formed among molecules of the PET protective film underthe action of the aluminate coupling agent; the obtained copolymer has a core-shell structure, and the shell phase is composed of methyl methacrylate which has large hardness and can be miscible withmethyl methacrylate in the