High refractive index TiO2 nano-composite optical film and production process thereof

A high-refractive-index titanium oxide nano-composite optical film and the preparation process are disclosed. Firstly, sol-gel process via hydrolysis and condensation reaction was employed for preparation of nano-scale titanium oxide particles. Then methacrylic acid, alkyloxysilyl compound etc. were grafted on the particle surface for improving compatibility, raising solid content, decreasing surface roughness, hindering particle growth in the organic resin structure, thus ensuring a stable and operative hybrid sol was obtained. To improve structure, mechanical property and hardness of titanium oxide hybrid optical film, acrylic monomer crosslinking in conjunction with UV cure were conducted on the plastic substrate. The produced film can exhibit the properties of refractive index of 1.75, colorless in visible region, good adherence to substrate and lower than 3.2nm of surface roughness, thus has potential for application to anti-reflection coating of optical devices.