High-temperature-resistant film and preparation method thereof

The invention discloses a high-temperature-resistant film and a preparation method thereof, and belongs to the technical field of films. The film comprises a base film, wherein the two sides of the base film are each provided with an anti-blocking agent layer; the base film is prepared from, by weight, 100-150 parts of PET, 60-80 parts of polyethylene, 30-40 parts of silicon dioxide, 12-20 parts of nano calcium carbonate, 6-12 parts of glass beads, 1-3 parts of COFs, 1-3 parts of a flatting agent, 5-10 parts of a coupling agent and 1-3 parts of a dispersing agent. By adding the silicon dioxide, the nano calcium carbonate, the glass beads and the COFs, the high-temperature resistance of the PET film can be effectively improved, the PET film can still be kept free of thermal deformation under the condition of 150-180 DEG C; meanwhile, the COFs can improve the stability and strength of the PET film, and therefore, the problem that the strength is reduced due to addition of other auxiliary materials is solved. 本发