Diffusion sheet for preventing particle displacement and preparation method thereof

Abstract

The invention discloses a diffusion sheet capable of preventing particle displacement and a preparation method thereof. The diffusion sheet capable of preventing particle displacement comprises a base material, a diffusion layer and an anti-blocking layer, wherein the upper plane of the base material is coated with the diffusion layer, the back face of the base material is coated with the anti-blocking layer, the diffusion layer comprises particles and a resin for fixing the particles to the upper surface of the base material, the resin is formed by mixing an SK-07 resin and an SK-08 resin according to a ratio of 1:1, the glass transition temperature Tg of the resin is 32.5 DEG C, the particle material is polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA) or polystyrene plastic (PS), the size of the particle material is 1-30 [mu]m, the base material is PET plastic, the material of the anti-blocking layer is soft, and micro-convex particles are arranged on the surface of the anti-blocking layer. Through the mode, the phenomenon of particle displacement in the coating process is prevented by increasing the Tg temperature of the resin, and particle displacement caused by the size of particles is prevented.

Description

technical field [0001] The invention relates to the technical field of diffusion sheets, in particular to a diffusion sheet for preventing particle displacement and a preparation method thereof. Background technique [0002] The diffusion layer of the diffusion sheet is composed of acrylic resin (Acryl resin) and dispersed particles (Bead). The diffusion sheet diffuses the light emitted from the backlight plate. The diffusion layer needs to be coated on the substrate of the diffusion sheet during the preparation process. Firstly, in the coating process, 90% of the resin is hardened when passing through the oven first, and then the secondary hardening is carried out, and the aging is carried out at 60°C for 24 hours, and more than 99% of the resin is hardened. The secondary hardening is aging for all hardening process, the existing technical solutions have the following disadvantages: 1. In the case of general resin, in the coating process, affected by the tension, the partic...

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Problems solved by technology

[0002] The diffusion layer of the diffusion sheet is composed of acrylic resin (Acryl resin) and dispersed particles (Bead). The diffusion sheet diffuses the light emitted from the backlight plate. The diffusion layer needs to be coated on the substrate of the diffusion sheet during the preparation process. Firstly, in the coating process, 90% of the resin is hardened when passing through the oven first, and then the secondary hardening is carried out, and the aging is carried out at 60°C for 24 hours, and more than 99% of the resin is hardened. The secondary hardening is aging for all hardening process, the existing technical solutions have the following disadvantages: 1. In the case of general resin, in the coating process, affected by the tension, the particles will be displaced along the direction of the tension; 2. It is determined by the size of the particles whether Particle displacement, for example, when the particle size combination is 5um+10um, particle displacement does not occur, and when the particle size combination is 5um+20um, particle displacement occurs. The larger the particle, the greater the pressure it receives. Therefore, in one Incomplete hardening during hardening, resulting in particle displacement during secondary hardening

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