A kind of transparent polyimide film and preparation method thereof

The invention discloses a kind of transparent polyimide film and preparation method thereof.Described transparent polyimide film obtains polyamic acid solution by polycondensation by aromatic diamine and dianhydride monomer in polar aprotic solvent, in polyamic acid solution, add organic bases mix, obtain polyamic acid salts solution, then polyamic acid salts solution plastic film mulch is carried out hot imide reaction obtain.The present invention, by the introducing of organic bases, reduces the temperature of hot-imide on the one hand, has saved energy consumption, reduced production cost; On the other hand, the transparent polyimide film obtained has more excellent optical transparence, high heat resistance and good weathering resistance, its second-order transition temperature is 200 DEG C ~ 300 DEG C, and UV cut-off wavelength is 280 ~ 400nm, and the light transmission rate at 450nm place is 80% ~ 98%.