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Preparation method of transfer diffusion film

A technology of diffusion film and transfer printing, which is applied in the field of diffusion film to achieve the effect of improving product yield, low cost and good haze

Active Publication Date: 2017-06-30
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing diffusion film preparation process requires sophisticated coating equipment and uses a large amount of organic solvents, the present invention provides a method for preparing a transfer diffusion film

Method used

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  • Preparation method of transfer diffusion film
  • Preparation method of transfer diffusion film

Examples

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preparation example Construction

[0058] Such as figure 1 , figure 2 and image 3 Shown, the present invention also provides the preparation method of above-mentioned transfer diffusion membrane, described method comprises the following steps:

[0059] (1) Prepare the transfer template: coat the polyurethane layer 2 on the surface of the substrate layer 4, coat the solvent-free UV-curable resin glue on the surface of the polyurethane layer 2, paste the diffusion film and after UV irradiation, peel off the diffusion film , the solvent-free UV-curable resin glue forms a concave structure 5 to obtain a transfer template (also called a primary transfer film);

[0060] (2) Get the substrate layer made by three-layer co-extrusion of the extruder, coat the first polyurethane layer and the second polyurethane layer on the two surfaces of the substrate layer respectively; coat a polyurethane layer on the surface of the second polyurethane layer Layer anti-adhesion layer, drying; Coating solvent-free UV-curable resi...

Embodiment 1

[0063] The invention provides a transfer diffusion film. The preparation method is as follows:

[0064] (1) Preparation of transfer template: Take 100 parts of polyurethane coating liquid, 0.03 parts of polydimethylsiloxane leveling agent, 0.05 parts of SPA-202 defoamer, 200 parts of pure water, and mix them evenly with a stirrer Apply it on the PET base film, place it in an oven and heat and dry at 130°C for 5 minutes to form a polyurethane layer; then take solvent-based polyester glue, curing agent, solvent MEK, and PMMA organic particles, and mix them evenly under a stirrer according to a certain ratio, and coat Put it on the lower surface of the PET base film with the polyurethane layer, and dry it in an oven at 120°C for 1 min to form an anti-blocking layer. Apply a solvent-free acrylic glue with a refractive index of 1.45 on the upper surface of the polyurethane layer without an anti-adhesion layer, attach a diffusion film with an average height of particle protrusions ...

Embodiment 2

[0067] For the transfer diffusion film provided in Example 1, wherein the transfer diffusion layer uses solvent-free acrylic glue with a refractive index of 1.47, and after UV irradiation, the transfer template is peeled off to obtain a transfer diffusion film.

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Abstract

The invention relates to a diffusion film for a backlight in a liquid crystal display, and especially relates to a preparation method of a transfer diffusion film to solve the problems that a conventional preparation process of a diffusion film needs precise coating equipment and a lot of organic solvents. The preparation method comprises the following steps: (1) preparing a transfer template: coating the surface of a substrate layer with a polyurethane layer, coating the surface of the polyurethane layer with solvent-free type UV curing resin glue, sticking a diffusion film and peeling the diffusion film after UV irradiation, wherein the solvent-free type UV curing resin glue forms a recessed-surface structure; and (2) coating two surfaces of the substrate layer with a first polyurethane layer and a second polyurethane layer respectively, coating the surface of the first polyurethane layer with solvent-free type UV curing resin glue, sticking a transfer template obtained in the step (1), peeling the transfer template after UV irradiation, and obtaining a transfer diffusion film. The preparation method is simple, and easy to realize.

Description

technical field [0001] The invention relates to a diffusion film used in a backlight source in a liquid crystal display, in particular to a preparation method of a transfer printing diffusion film. Background technique [0002] Diffusion film is one of the most important optical films used in backlight modules of liquid crystal displays. Its main function is to disperse and homogenize the light emitted by the light source in the backlight. In order to achieve the condition of uniform dispersion of light, it uses the refractive index difference between resin, PET, and organic particles, the filling and diffuse reflection functions of organic particles to disperse the light, and has a certain haze to cover the lamp shadow. [0003] In order to achieve a good light scattering and shielding effect, the following method is generally used to prepare the diffusion film: first, the solvent-based resin glue, organic particles, curing agent, and additives are formulated into a coating...

Claims

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Application Information

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IPC IPC(8): G02B5/02
CPCG02B5/0268
Inventor 金亚东张克然王陈
Owner NINGBO CHANGYANG TECH
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