UV-responsive dynamic color-changing automotive heat-insulation film and preparation method thereof

Abstract

The invention provides a UV-responsive dynamic color-changing automotive heat insulation film and a preparation method thereof, belonging to the technical field of functional materials for automotive glass. The heat insulation film comprises, in sequence, a UV sensing layer, a dynamic color-changing layer, a weather-resistant protective layer, an electrostatic adhesive layer, and a fail-safe module. The UV sensing layer is composed of a polyester matrix doped with an AgCl-TiO2-ZnO nanocomposite, while the weather-resistant protective layer adopts a high-transmittance polyurethane-nano SiO2 composite coating. The preparation method includes synthesizing nanomaterials via a sol-gel process, layered coating formation, and vacuum hot-pressing. The invention enables intelligent matching between UV intensity and light transmittance, achieving a daytime heat insulation efficiency greater than or equal to 90% and nighttime visibility greater than or equal to 200 m. After 5000 cycles of UV testing, the light transmittance attenuation is less than or equal to 3%, with no delamination or bubbling, making it suitable for various types of automotive windows.