Light diffusion agent mother material used for light diffusion film, preparation method and application thereof

Abstract

The invention provides a light diffusion agent mother material used for a light diffusion film, a preparation method and application thereof. A light diffusion agent is compounded from organic polymer cross linking microspheres with different refractive indexes and grain diameters, the light diffusion agent mother material is prepared from 100 weight parts of polyester resin, 60 to 100 weight parts of compounded light diffusion agents and 1 to 7 weight parts of diffusion resin through high-speed diffusion and fused extrusion grain cutting by a double-screw extruding machine. The invention also provides a high-transparency heat-resistance light diffusion film prepared by using the light diffusion agent mother materials as additives. The light diffusion layer of the light diffusion film is formed by mixing the light diffusion agent mother materials and polyester slices according to the mixture ratio of 40 to 60 weight percent of polyester slices and 40 to 60 weight percent of the light diffusion agent mother materials. The light diffusion film prepared by the invention has high light transmission rate, high mist degree, excellent heat resistance performance and excellent dimension stability, and is particularly suitable for being used as the light diffusion film in a back light module of a large-dimension liquid crystal display.

Description

technical field [0001] The present invention relates to a light-diffusing agent masterbatch for producing light-diffusing films by a multilayer co-extrusion method and a preparation method thereof, and also relates to a light-diffusing film prepared from the masterbatch, and the light-diffusing film has a balanced light transmittance and light diffusion properties while maintaining excellent heat resistance and dimensional stability. It belongs to the technical field of functional polymer material processing. Background technique [0002] The light diffusion film is an important part of the backlight module of the liquid crystal display (LCD). Its function is to atomize the point light source or line light source emitted from the front of the light guide plate into a uniform surface through the light scattering effect of the light diffusion agent particles dispersed on the surface of the film. Light source, improve the luminance of the LCD panel and control the uniformity o...

AI Technical Summary

Problems solved by technology

However, this method uses thermoplastic polystyrene resin to form a tiny dispersed phase in polyester as light diffusing agent particles. The size and shape of the dispersed phase particles are strongly dependent on extrusion conditions and stretching conditions, so it is impossible to obtain stable light diffusion. performance light diffusing film

[0005] When using a multi-layer co-extrusion method to prepare a light-diffusing film, if the light-diffusing agent and polyester are directly mixed as the raw material for the light-diffusing layer, it is difficult to ensure that the light-diffusing agent particles in the light-diffusing layer are uniformly dispersed after co-extrusion. It affects the light transmittance of the light-diffusing film; on the other hand, it is necessary to set up a large-volume raw material resin silo on the production line, and when producing different grades of light-diffusing film, it is necessary to set up multiple raw material resin silos

Therefore, the utilization rate of production equipment is low and the operation flexibility is poor