This invention, entitled "A High-
Transmittance Polyimide Film Main Material,
Film Coating,
Composite Film Material, and Their Preparation and Application," belongs to the field of materials technology. Addressing the problems of easy surface
cracking and significant degradation of optical performance after
radiation in existing transparent anti-ionic
oxygen polyimide films, this invention provides a
polyimide film with high
optical transparency and strong anti-ionic
oxygen erosion resistance. The key technical point is a high-
transmittance polyimide film main material, comprising an aromatic
phosphorus-containing
diamine, an alicyclic dianhydride
monomer, and an
organic solvent; the aromatic
phosphorus-containing
diamine is 2,5-bis[(4-aminophenoxy)phenyl]diphenyloxyphosphine; the alicyclic dianhydride
monomer is selected from at least one of 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dimethyl-
cyclobutane-1,2,3,4-tetracarboxylic dianhydride, and 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride.