Preparation method of PET with light scattering porous micro-foaming structure and diffusion film

A micro-foaming and light-scattering technology, applied in optics, optical components, diffusing components, etc., can solve problems such as unfavorable scattering, complicated manufacturing, friction and warping, etc., and achieve the effect of improving uneven brightness

Active Publication Date: 2021-10-15
博讯光电科技(合肥)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these commonly used functional diffusion particles have ultraviolet absorption and uneven dispersion in the film. When the density of the diffusion particles on the diffusion layer is small, the density of the scattering centers becomes small. When the density of the diffusion particles on the diffusion layer is high When it is large, even particle superposition phenomenon occurs, which means optical congestion, which is not conducive to scattering, and eventually leads to problems such as uneven display brightness, falling off of diffusing particles, serious friction warping, etc., and the design and manufacture of these functional diffusing particles are complicated and costly

Method used

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  • Preparation method of PET with light scattering porous micro-foaming structure and diffusion film
  • Preparation method of PET with light scattering porous micro-foaming structure and diffusion film
  • Preparation method of PET with light scattering porous micro-foaming structure and diffusion film

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preparation example Construction

[0049] The preparation method of the light-scattering porous micro-foam structure PET is realized by a pressure transition method.

[0050] Using CO 2 The supercritical gas dissolves into the PET material, and after a period of saturation, the CO 2Mix evenly with PET to become a homogeneous system, through phase separation technology, realize CO 2 nucleation, followed by decompression to prevent bubble growth

[0051] Specifically, the production of porous and micro-foamed PET is realized by adjusting the foaming pressure, foaming temperature, saturation time and pressure relief.

[0052] The foaming pressure is: 40MPa-50MPa, the foaming temperature is: 60°C-100°C, the saturation time is 0.5min-2min, and the pressure relief method is rapid pressure relief, which is divided into two stages:

[0053] First stage rapid depressurization from initial pressure down to CO 2 Critical pressure, the critical pressure is: 7.38MPa, CO 2 The density of supercritical gas is: 0.448g / cm ...

Embodiment 1

[0057] A method for preparing a warp-controllable and non-scattering particle diffusion film, the preparation method comprising the following steps:

[0058] S1: Light-scattering porous micro-foamed PET is prepared by the following steps: 2 Foaming device preparation, foaming pressure 40MPa, foaming temperature 60°C, foaming time 0.5min, the first stage of pressure relief takes 1s, the second stage of pressure relief takes 5s to obtain a diffusion layer 1, the thickness of which accounts for the total membrane material 10% of the thickness, that is, the foamed microstructure PET diffusion layer 1 .

[0059] S2: Unwind 10 parts of the diffusion layer 1 onto 55 parts of the film core layer 2, the intermediate substrate PET includes the first optical surface and the second optical surface, and after drying, it is rolled to obtain a semi-finished product containing a front coating .

[0060] S3: the back coating of the diffusion film is to unwind the front coating semi-finished ...

Embodiment 2

[0063] A method for preparing a warp-controllable and non-scattering particle diffusion film, the preparation method comprising the following steps:

[0064] S1: Light-scattering porous micro-foamed PET is prepared by the following steps: 2 Foaming device preparation, foaming pressure 50MPa, foaming temperature 80°C, foaming time 1min, the first stage of pressure relief takes 2s, and the second stage of pressure relief takes 10s to obtain a diffusion layer 1, the thickness of which accounts for the total membrane thickness 10%, that is, the foamed microstructure PET diffusion layer 1.

[0065] S2: Unwind 10 parts of the diffusion layer 1 onto 55 parts of the film core layer 2, the intermediate substrate PET includes the first optical surface and the second optical surface, and after drying, it is rolled to obtain a semi-finished product containing a front coating .

[0066] S3: the back coating of the diffusion film is to unwind the front coating semi-finished product prepar...

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Abstract

The invention discloses a preparation method of PET with a light scattering porous micro-foaming structure and a diffusion film. The PET with the light scattering porous micro-foaming structureis realized through a pressure transformation method, the preparation method specifically comprises the following steps: CO2 supercritical gas is dissolved in a PET material, CO2 and PET are uniformly mixed through saturation to form a homogeneous system, CO2 nucleation is achieved through a phase separation technology, and then bubble growth is prevented through a pressure reduction method; compared with a traditional diffusion film diffusion layer surface coated with organic / inorganic diffusion particles to enhance the light diffusion capacity, the porous microstructure is prepared on the diffusion layer surface of the diffusion film, the problems that a traditional diffusion film is uneven in display brightness, diffusion particles fall off, friction is prone to occurring, and warping is serious are solved, meanwhile, and the light transmittance, the haze, the ink adhesive force and the surface impedance are not lower than those of a traditional diffusion film.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a preparation method of light-scattering porous micro-foam structure PET and a diffusion film. Background technique [0002] In recent years, flat panel display technology and products have developed rapidly, and the flat panel display industry and market are growing rapidly around the world. Flat panel displays are widely used in TVs, computer monitors, notebook computers, mobile phones, digital cameras, GPS navigators, etc. As an important part of FPD, the backlight module is mainly composed of backlight, light guide plate, optical diffusion film, prism film and reflective film. The optical diffusion film is located above the light guide plate. After the light passes through the diffusion film, many refraction, reflection and scattering phenomena will occur, thereby forming a uniform surface light source to achieve the effect of optical diffusion. [0003] However, ...

Claims

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Application Information

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IPC IPC(8): G02B5/02G02B1/14
CPCG02B5/0247G02B5/0268G02B1/14Y02P20/54
Inventor 胡建吴蕾陈伟峰张艳
Owner 博讯光电科技(合肥)有限公司
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