The invention discloses an optical
diffusion film and a manufacturing method thereof. According to the optical
diffusion film, a PET film serves as a base material, and a light
diffusion layer is cured on the surface. The light
diffusion layer is prepared from the following raw materials in parts by
mass: 100 parts of
urethane acrylate, 25-35 parts of
tripropylene glycol diacrylate, 10-30 parts ofcore-shell type light diffusion microspheres and 1-3 parts of a
photoinitiator. The preparation method of the core-shell type photodiffusion
microsphere comprises the following steps: adjusting the pH value of the 35-50% (v / v)
ethanol solution to 3.0-5.0; adding APS, VTMS and phenyltriethoxysilane into the mixture; magnetically stirring at 25-40 DEG C to react for 2-6 hours; adjusting the pH value to 9-11, continuously reacting for 3-8 hours, adding Zn(NO3)2.6H2O, Ce(NO3)3.6H2O, Al(NO3)3.9H2O and HTM, magnetically stirring for 0.5-1 hour, refluxing at 80 DEG C for 3-5 hours, cooling to 40-50DEG C, dropwise adding
glutaraldehyde for cross-linking modification for 1-2 hours, centrifugally washing and
drying. The optical diffusion film is uniform, stable, good in
weather resistance and durability, the visible light
transmittance reaches 93% or above, the
haze reaches 85% or above, the
ultraviolet light
transmittance is lower than 12%, and the 400 nm-480 nm short-wave
blue light transmittance is lower than 15%.