The invention relates to the technical field of optical functional films, and discloses a high-
haze calcite BOPET composite
diffusion film and a preparation method and application thereof.The gradient micropore-compact layer
composite structure design is adopted, functional composition of all
layers is optimized, on one hand, in a surface compact layer, low-filling nano
calcite is used for constructing a high-compact structure, and on the other hand, the high-
haze calcite BOPET composite
diffusion film is prepared; the surface
light reflection is effectively reduced, the
mechanical strength is improved, and meanwhile, the light
transmittance loss is avoided; on the other hand, double-particle-size calcite nano-particles and micron-particles are introduced into the bottom microporous layer, a multi-scale scattering network is constructed, efficient light
diffusion within the wide spectral range of 380-780 nm is achieved, interface
scattering loss is remarkably reduced, and the light
transmittance and
haze balance of the
optical film are greatly improved; meanwhile, integrated forming is achieved through a co-
extrusion-two-way stretching process, inorganic /
organic interface combination is optimized, the problem of filler agglomeration is effectively solved, and meanwhile the preparation cost is reduced.