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Preparation method of optical diffusion film

A technology of optical diffusion and diffusion film, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc. It can solve the problems of light brightness and low scattering uniformity, so as to improve the light gathering ability and brightness and the effect of scattering uniformity, high brightness and scattering uniformity

Active Publication Date: 2014-05-07
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the defect that the scattering particles with large particle size and small particle size (also known as diffusion particles, diffusion particles) are randomly mixed together in the existing optical diffusion film, so that the brightness and scattering uniformity of light are low, the present invention provides a Optical diffusion film and preparation method thereof, the diffusion film has high brightness and scattering uniformity, and the preparation method is simple in process and easy to operate

Method used

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  • Preparation method of optical diffusion film
  • Preparation method of optical diffusion film
  • Preparation method of optical diffusion film

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preparation example Construction

[0046] The preparation method of the optical diffusion film provided by the invention comprises the following steps:

[0047] Step 1. Preparation of scattering masterbatch

[0048] Mix the calculated amount of small particle scattering particles with polyester chips evenly, so that the weight content of scattering particles in the masterbatch is 4g-8g / kg, preferably 6g / kg (6000ppm), and then melt, extrude, and pelletize. Prepare the scattering masterbatch;

[0049] Step 2, preparation of substrate

[0050] Mix the scattering masterbatch obtained in step 1 with the polyester chip, wherein the weight ratio of the scattering masterbatch to the polyester chip is 30-50:70-50 to make a mixture A, and the obtained mixture A and the base material B Carry out melting and plasticizing separately, and the obtained melt enters the die head of the three-layer co-extruder through the distributor. The two outer layers are the mixture A, and the middle layer is the base material B. Two-way...

Embodiment 1

[0059] The diffusion film was prepared according to the above method, the thickness of the base film was 75 μm; the base film was an ABA three-layer co-extrusion structure, and the ratio of the diffusion masterbatch and the bright slice in the A layer was 42:58. Single-sided coating of large particle scattering particles, the particle size of the large particle scattering particles in the diffusion coating is 40 μm-60 μm, the large particle scattering particles account for 18% of the entire diffusion coating, and the amount of the thinner is 35% of the total weight of the coating solution . The final diffusion film thickness was 135 μm. The measurement results of the optical properties (light transmittance, haze) of the obtained film are shown in Table 1.

Embodiment 2

[0061] The diffusion film was prepared according to the above method, the thickness of the base film was 150 μm; the base film was an ABA three-layer co-extrusion structure, and the ratio of the diffusion masterbatch and the bright slice in the A layer was 40:60. Coating large particle scattering particles on one side, the particle size of the large particle scattering particles in the diffusion coating is 60 μm-80 μm, the large particle scattering particles account for 26% of the entire diffusion coating, and the amount of the thinner is the total weight of the coating solution 50% of. The final diffusion film thickness was 230 μm. The measurement results of the optical properties (light transmittance, haze) of the obtained film are shown in Table 1.

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Abstract

The invention relates to the technical field of optical films, in particular to an optical diffusion film and a preparation method thereof. In order to overcome the defects of low light brightness and low scattering uniformity caused by mixed scattering particles with large particle sizes and small particle sizes in the conventional optical diffusion film, the invention provides the optical diffusion film and the preparation method thereof. The optical diffusion film comprises a base material, wherein the base material comprises small-granule scattering particles with the particle size of 1 to 10 mu m; at least one of two sides of the base material is provided with large-granule scattering particles with the particle size of 40 to 100 mu m; and the large-granule scattering particles are adhered to the surface of the base material through bonding resin. The provided optical diffusion film has high light transmittance and haze; and therefore, the optical diffusion film has high brightness and scattering uniformity. The preparation method has a simple process and is easy to operate.

Description

technical field [0001] The invention relates to the technical field of optical thin films, in particular to an optical diffusion film and a preparation method thereof. Background technique [0002] Optical diffusion film (also known as optical diffusion film, light diffusion film, referred to as diffusion film) is widely used in liquid crystal displays, advertising light boxes, lighting fixtures and other devices that require light sources, especially in liquid crystal display devices, the diffusion film is the backlight module. key components. The main function of the optical diffusion film is to increase the brightness of the light, soften and diffuse the light received by the light guide plate, provide a uniform surface light source for the display, and widen the viewing angle. [0003] As far as liquid crystal displays are concerned, two optical diffusion films are required in the entire optical module, which are called the upper diffusion film and the lower diffusion f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02C08J7/04B32B27/14
Inventor 不公告发明人
Owner NINGBO CHANGYANG TECH
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