The invention relates to a window film with automatically adjustable light
transmittance. The window film is prepared by comprising the steps of adding a photochromic dye, an
ultraviolet absorbent agent, a pressure-sensitive
adhesive and an
organic solvent into a stirrer, unceasingly stirring to raise the temperature to be 50 DEG C, then keeping the temperature, unceasingly stirring for 0.5 hours so as to obtain a photochromic pressure-sensitive
adhesive;
coating the photochromic pressure-sensitive
adhesive on a PET (
polyethylene terephthalate) base film,
drying the PET base film, and
compositing the PET base film coated by the photochromic pressure-sensitive adhesive and the PET base film plated with a thermal-protective layer so as to obtain a
composite film;
coating an anti-scratch
coating on one surface of the
composite film, solidifying the anti-scratch coating through a UV-
irradiation, coating the pressure-sensitive adhesive one the other surface of the
composite film, and
compositing the pressure-sensitive adhesive surface and a release film. The window film provided by the invention has the advantages that the regulation range of the visible light
transmittance is large, the light
transmittance is automatically reduced under the highlight environment and can automatically recover under the low light environment, and the colorless light is changed to be
colored under the highlight environment, so that the whole beautiful effect is improved, the color kind and light transmittance increasing and decreasing range are adjusted according to the need, the manufacturing process is simple, and the production efficiency is high.