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Lyotropic liquid crystal polarizing film and preparation method thereof

A lyotropic liquid crystal and polarizing film technology is applied in the field of lyotropic liquid crystal solid-state polarizing film and its preparation, which can solve the problems of poor moisture and heat resistance, low heat resistance temperature, and poor optical uniformity, and achieves excellent moisture and heat resistance and heat resistance. The effect of high temperature and simple structure

Inactive Publication Date: 2006-09-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polarization efficiency of the iodine polarizer is high, up to 99%, but its heat-resistant temperature is low, and its resistance to humidity and heat is poor. When it exceeds the glass transition temperature T of PVA g (60 ~ 80 ℃) environment for a period of time, it is easy to fail; the dye polarizer has a high heat resistance temperature, but its optical uniformity is poor, and the polarization efficiency is low, usually only about 50%.
More importantly, with the continuous advancement of science and technology, electronic display devices are developing towards flexibility (such as rollable), miniaturization and integration, which puts forward higher requirements for polarizing materials for liquid crystal displays, especially The thickness of the polarizing material should be small and thin, but the thickness of the current polarizer is as high as 200-240 μm, which can no longer meet the requirements of the thin film of the liquid crystal display.

Method used

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  • Lyotropic liquid crystal polarizing film and preparation method thereof
  • Lyotropic liquid crystal polarizing film and preparation method thereof
  • Lyotropic liquid crystal polarizing film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Mix the reduced dark blue BO with a molar ratio of 1:20 and fuming sulfuric acid (concentration is 20% by mass), heat to 110 ° C, and keep it warm for 36 hours, then cool to room temperature, pour it on ice cubes to precipitate, and then put the ice on the ice. The analyzed solution was vacuum-filtered under reduced pressure, washed with absolute ethanol and deionized water until there were no sulfate ions in the filtrate, and dried to obtain sulfonated reduced dark blue BO.

[0046] Dissolve 2g of sulfonated reduced dark blue BO in 500ml of distilled water, vacuum and filter under reduced pressure with an acid-resistant filter funnel with a filter hole of 3 to 5 microns, then heat and evaporate the solution to a 12.5% ​​solution, cool to room temperature, and obtain a structurally ordered Sulfonated reduction dark blue BO lyotropic liquid crystal phase.

[0047] Before coating, the glass substrate is cleaned with Piranha solution (prepared by mixing concentrated sulfur...

Embodiment 2

[0051] Mix 0.2 mol of Vat Blue RSN with 2 mol of fuming sulfuric acid (concentration is 20% by mass) and 1 mol of chlorosulfonic acid, heat to 95°C, keep warm for more than 72 hours, cool to room temperature, pour it on ice cubes to precipitate, and The ice-out solution was vacuum-filtered under reduced pressure to obtain a blue filter cake.

[0052] Disperse the blue filter cake, add 250ml of concentrated hydrochloric acid (concentration 36-38% by mass), oscillate ultrasonically for 1.5 hours, then heat to 100°C, keep it warm for 2 hours, cool, and filter with an acid-resistant filter with a filter hole of 5-7 microns The funnel was vacuumed and filtered under reduced pressure, washed with concentrated hydrochloric acid until the filtrate was free of sulfate ions, and dried to obtain sulfonated reduced blue RSN powder.

[0053] Add 0.5 g of sulfonated vat blue to 100 ml of distilled water, stir electromagnetically for 2 hours, filter, evaporate and concentrate by heating to o...

Embodiment 3

[0056] Mix 1 mol of reduced scarlet GG with 12 mol of oleum (concentration: 20% by mass), heat to 70° C. and keep it warm for 12 hours, cool to room temperature, pour it on ice cubes to precipitate, vacuum and filter the ice-out solution under reduced pressure, Wash with concentrated hydrochloric acid until the filtrate is free of sulfate ions, and dry to obtain sulfonation-reduced scarlet powder.

[0057] 1 gram of sulfonated reduced scarlet GG and 2 grams of sulfonated reduced blue RSN prepared in Example 2 were added to 450 ml of distilled water, magnetically stirred for 1 hour, filtered, then heated and evaporated to concentrate a solution of 12.5% ​​(mass percentage), Cool to room temperature.

[0058] At a temperature of 25-32°C and a relative humidity of 50-70%, apply the above-mentioned mixed solution with a concentration of 12.5% ​​to a wire rod coater with a winding diameter of 10 microns and a round rod of Φ15mm×150mm to apply shear. The force is 25-30N, and the so...

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Abstract

This invention relates to a lyotropic liquid crystal solid-state polarizing film and preparation method thereof. Wherein, the preparation process comprises: modified processing, preparing the solution, coating film and orientating, and stabilizing to obtain the target. This invention has polarization efficiency more than 95% with thickness only in 0.5-1,2 mum.

Description

technical field [0001] The invention relates to the field of electronic display devices, in particular to a lyotropic liquid crystal solid polarizing film and a preparation method thereof. Background technique [0002] One of the most widely used technologies in electronic display devices such as mobile phones, digital cameras, calculators, notebook computer monitors and various digital display instruments is liquid crystal display technology. Liquid crystal displays are mainly composed of three materials: transparent conductive glass, liquid crystal materials and polarizers. Among them, the polarizer plays the role of polarizing light and analyzing polarized light, and is formed by laminating and pressing multi-layer sheets. The preparation process of the polarizer is generally: substrate preparation→dip dyeing→stretch orientation→stabilization treatment→glue protective film, the total thickness of the polarizer is generally 200-240μm. According t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335
Inventor 张亚辉龚建勋曾德长刘正义闻立时邱万奇
Owner SOUTH CHINA UNIV OF TECH
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