| abstract |
A spiropyran-based photochromic coating and a preparation method thereof, the coating contains polyurethane/spiropyran/zinc sulfide composite multilayer photochromic material, the core of which is zinc sulfide mesoporous nano-microspheres, the middle layer It is a photochromic layer composed of spiropyran compounds, and the outer shell is polyurethane; the outer diameter of the composite microsphere is 50-350nm, wherein the diameter of the zinc sulfide mesoporous nano-microsphere is 30-250nm, and the thickness of the middle layer is 2 to 25 nm, and the thickness of the shell is 5 to 25 nm. The photochromic coating prepared by the method of the present invention can be used as the surface color-changing layer of optical color-changing materials or optical lenses, and the coating can change from colorless to colored under ultraviolet irradiation, and can quickly fade to Colorless, it has the advantages of strong fatigue resistance, good stability, and fast discoloration. |