Preparation method of diffusion film coating composition, preparation method of diffusion film, and corresponding diffusion film

Abstract

The invention provides a preparation method of a coating composition for forming a diffusion film on a surface of a transparent base material. The method comprises the following steps: (1) forming a particle nuclear disperse phase A from particle nuclear and a solvent; (2) adding a reactive monomer and an initiator to the particle nuclear disperse phase A in the step (1), forming a particle core-shell structure by in-situ reaction, and preparing a diffusion particle dispersion liquid B; and (3) adding resin, a monomer, an initiator and an adjuvant to the diffusion particle dispersion liquid B in the step (2), and preparing the diffusion film coating composition. In the invention, firstly, particle nucleus is evenly dispersed in the solution to prepare the diffusion particle dispersion liquid, and a hardening agent is added to the diffusion particle dispersion liquid to directly prepare a coating solution. Diffusion particles formed by the particle nucleus by in-situ reaction reach controllable mean density, improvement of the problem of diffusion particle sedimentation is facilitated, the diffused particles are evenly dispersed into a dispersion liquid after in-situ reaction, the viscosity of the dispersion liquid is relatively low, and diffusion of the diffusion particles is facilitated.

Description

technical field [0001] The invention relates to a preparation method of a diffusion film coating composition, a preparation method of a diffusion film, and a corresponding diffusion film. Background technique [0002] In recent years, various liquid crystal flat panel display technologies have developed rapidly. The diffusion film is one of the structures of the backlight module device. Its function is to correct the diffusion angle through the light diffusion effect of the material, so as to increase the light radiation area to provide a uniform surface light source for the flat panel display. [0003] Chinese patent application 201210430200.1 provides an optical diffusion film that can be used in flat panel display backlight modules. In this invention, the ratio of resin and diffusion particles is adjusted in the coating liquid, and a leveling agent is added. After ultraviolet (UV) curing , from the scanning electron microscope test, it can be observed that the appearance...

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Problems solved by technology

[0003] Chinese patent application 201210430200.1 provides an optical diffusion film that can be used in flat panel display backlight modules. In this invention, the ratio of resin and diffusion particles is adjusted in the coating liquid, and a leveling agent is added. After ultraviolet (UV) curing , from the scanning electron microscope test, it can be observed that the appearance of the diffusion film is not uniform, and there is agglomeration of particles. The reason for the above phenomenon is that there are obvious compatibility and dispersion problems between the diffusion particles and the polymer, and in There is a problem of particle settling in the diffusion film preparation process, which reduces the haze of the diffusion film, increases the light transmittance of the film layer, and affects the uniformity and qualification rate of the product.

However, the problem in the preparation method of this invention is that since the compatibility between the silicone particles and the solvent is worse than that of the coating resin, the diffusion particles are more likely to form agglomeration during the process of dispersing the silicone diffusion particles into the solvent, which makes the It fails to get better dispersion, resulting in uneven dispersion of particles in the diffusion film product, affecting the uniformity and stability of its optical properties

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