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Optical diffusion film and preparation method thereof

A technology of optical diffusion and diffusion film, which is applied to chemical instruments and methods, flat products, and other household appliances, etc., can solve problems such as poor adhesion and complicated process, and achieve environmental protection, good comprehensive performance, and improved adhesion. The effect of knot strength

Active Publication Date: 2012-07-04
NINGBO CHANGYANG TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the defects of poor adhesion between the diffusion particles in the existing optical diffusion film, the adhesive resin and the base film, and the existing optical diffusion film requires post-coating processing and complicated processes, this paper The invention provides an optical diffusion film and a preparation method thereof. The adhesion force between the diffusion particles and the resin in the optical diffusion film provided by the invention is good, and the surface anti-blocking performance and optical performance are good. The preparation method comprises three layers Co-extrusion and biaxial stretching process, easy to operate

Method used

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  • Optical diffusion film and preparation method thereof
  • Optical diffusion film and preparation method thereof

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preparation example Construction

[0051] The preparation method of the optical diffusion film provided by the invention comprises the following steps:

[0052] (1) Preparation of scattering masterbatch

[0053] Mix the calculated amount of scattering particles and 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 to obtain scattering masterbatch;

[0054] (2) Preparation of diffusion membrane

[0055] Mix the scattering masterbatch obtained in step (1) with the polyester chip, wherein the weight ratio of the scattering masterbatch and the polyester chip is 30-50:70-50 to make a mixture A, and the obtained mixture A is mixed with the substrate Raw material B is melted and plasticized separately, and the resulting melt enters the die head of the three-layer co-extruder through a distributor. The two outer layers are compound A, and the middle layer is base material B. The resulting thick s...

Embodiment 1

[0063] Diffusion film is prepared according to the aforementioned method, the gained film thickness is 75um, single diffusion layer, the weight ratio of scattering masterbatch and bright section in the diffusion layer is 32: 68, PMMA particle size is 2-10um, the weight in masterbatch The content is 6g / kg, the weight ratio of the anti-adhesion masterbatch to the glossy chip in the anti-blocking layer is 35:65, and the middle layer uses the glossy chip entirely. The resulting diffuser membrane is figure 2 As shown, the film surface anti-blocking performance and optical properties (light transmittance, haze) measurement results are shown in Table 1.

Embodiment 2

[0065] Prepare the diffusion film according to the aforementioned method, the obtained film thickness is 125um, single diffusion layer, the proportioning of scattering masterbatch and bright slice in the diffusion layer is 36:64, PMMA particle size is 2-20um, the weight in masterbatch The content is 6g / kg, the weight ratio of the anti-adhesion masterbatch to the glossy chip in the anti-blocking layer is 35:65, and the middle layer uses the glossy chip entirely. The resulting diffuser membrane is figure 2 As shown, the film surface anti-blocking performance and optical properties (light transmittance, haze) measurement results are shown in Table 1.

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Abstract

The invention relates to the technical field of an optical thin film, in particular to an optical diffusion film and a preparation method thereof in order to solve the defects that diffusion particles in the traditional optical diffusion film have poor cohesive force with a bonding resin and a basal membrane, and the traditional the optical diffusion film needs to be processed after being coated and is complex in technology. The optical diffusion film provided by the invention is of a three-layer structure and comprises a base material; and a diffusion layer is arranged at the at least one side of the two sides of the base material and comprises scattering particles with the particle size of 1-60mum. The diffusion particles in the optical diffusion film provided by the invention have better cohesive force with the bonding resin, good surface anti-adhesion performance and optical performance; and the preparation method optical thin film comprises three-layer co-extrusion and two-way stretching technologies and is simple 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 called optical 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 key to the backlight module. parts. 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 film respectively. Amo...

Claims

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Application Information

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IPC IPC(8): G02B5/02B32B27/14B32B27/36B29C55/12B29B7/00B29L7/00
Inventor 不公告发明人
Owner NINGBO CHANGYANG TECH
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