Preparation method of high-transmittance high-haze light diffusion film

Abstract

The invention relates to a preparation method of a high-transmittance high-haze light diffusion film, which comprises the steps of grinding two kinds of organic silicon light diffusion agents with the particle diameter being 1.0 micron and 2.5 microns to powder with the particle diameter being less than 0.1 micron, and performing fusing, blending and granulating on the two kinds to organic silicon diffusion agents and transparent polyester according to the a ratio of 1:1:2 in parts by mass so as to prepare a light diffusion master batch with the intrinsic viscosity being 0.60-0.75dL / g; uniformly mixing 5-25% of the prepared light diffusion master batch and 75%-95% of the transparent polyester according to a mass percentage in a high-speed dispersion machine so as to prepare a surface layer raw material; and sending 5-25% of the surface layer raw material and 75-95% of the transparent polyester to a corresponding extrusion system as core layer raw materials so as to perform fusion and extrusion, then casting into a thick sheet, performing longitudinal extension, transverse extension and heat setting on the thick sheet, and then preparing a light diffusion film through cooling, winding and cutting. The light diffusion film can reach high light transmittance and high haze, and has good dimensional stability and ability for resisting ultraviolet light emitted by a light source.

Description

technical field [0001] The invention relates to a preparation method of a high-transparency and high-foggy light diffusion film, which belongs to the technical field of light diffusion films. Background technique [0002] The light diffusion film can provide a uniform surface light source for the liquid crystal display. Generally, the traditional diffusion film is mainly to add chemical particles to the diffusion film base material as scattering particles, while the existing diffusion plate has particles dispersed in it. Between the resin layers, when the light passes through the diffusion layer, it will continue to pass through two media with different refractive indices, so the light will undergo many phenomena of refraction, reflection and scattering, which will result in the effect of optical diffusion. Therefore, the light diffusion film is almost one of the essential materials in the material composition of the LCD backlight source. [0003] The light diffusion film i...

AI Technical Summary

Problems solved by technology

However, the existing light-diffusing films need to add materials such as anti-blocking agents and dispersing resins. When the film reaches a high light transmittance and haze, the performance of the light-diffusing film will be affected, resulting in a decrease in dimensional stability.

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