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Preparation method of liquid crystal polarizing film with characteristic of ultra-wide wave reflection

A polarizer and liquid crystal technology, applied in polarizing elements, optics, instruments, etc., can solve the problems of complicated process, narrow reflected wave width, and narrow application area, and achieve the effects of simple manufacturing process, easy large-scale production, and good weather resistance

Inactive Publication Date: 2011-11-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing an ultra-broadband reflective liquid crystal polarizer. Through an optimized formula and a simple process, an ultra-broadband reflective liquid crystal polarizer can be prepared to overcome the problems of narrow reflected wave width, complex process, and narrow application. shortcoming

Method used

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  • Preparation method of liquid crystal polarizing film with characteristic of ultra-wide wave reflection
  • Preparation method of liquid crystal polarizing film with characteristic of ultra-wide wave reflection
  • Preparation method of liquid crystal polarizing film with characteristic of ultra-wide wave reflection

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example 1

[0029] Mixed liquid crystal: Polyacryloyl photopolymerizable liquid crystal monomer A1, content of 12.9%, monoacryloyl photopolymerizable liquid crystal monomer A2 content of 38.7%, chiral monoacryloyl photopolymerizable liquid crystal monomer A3 content It is 46.4%, the UV absorber is 1.5%, the initiator is Irgacure 651, the content is 0.5%, and the mixture is uniform; the phase transition behavior of the mixture: C45SmA102Ch151I. Pour the mixture at 120℃ into a liquid crystal cell with a thickness of 60μm and anti-parallel orientation after rubbing. The mixture is arranged in a plane, and the temperature is reduced to 109℃. The wavelength is 365nm and the intensity is 0.065mW / cm. 2 Irradiated under UV light for 30 minutes, cured and cross-linked to obtain a liquid crystal polarizer with reflection wavelength above 550-12000nm (such as figure 1 ). The scanning electron micrograph of the cross-sectional structure of the obtained reflective polarizer is as follows figure 2 Shown...

example 2

[0031] Mixed liquid crystal: Multi-diacrylate photopolymerizable liquid crystal monomer B1 content is 14.8%, monodiacrylate photopolymerizable liquid crystal monomer B2 content is 44.7%, monodiacrylate photopolymerizable liquid crystal monomer B3 content It is 32.7%, the chiral additive is cholesterol, the content is 5.2%, the ultraviolet absorber is phosphine salt, the content is 1.8%, the initiator is Irgacure 651, the content is 0.8%, and the mixture is uniform; the phase transition behavior of the mixture: C38SmA95Ch137I . Pour the mixture into a liquid crystal cell with a thickness of 60μm and a rubbing anti-parallel orientation treatment at 115℃, make the mixture align in a plane, cool to 101℃, at a wavelength of 365nm, and an intensity of 0.3mW / cm 2 After being irradiated with the ultraviolet light for 30 minutes, the liquid crystal polarizer with the reflection band of 500-14000nm is obtained after curing and crosslinking.

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Abstract

The invention provides a preparation method of a liquid crystal polarizing film with the characteristic of ultra-wide wave reflection, belonging to the application of liquid crystal materials and the correlative technical field. The preparation method of mixed liquid crystal comprises the steps of: mixing mono and / or multi optical polymeric group liquid crystal liquid crystal property monomer, ultraviolet absorber and optical initiator; injecting the prepared liquid crystal into a liquid crystal box or a film which performs the process of planar orientation, wherein the liquid crystal is under a transparent plane texture status; polymerizing by means of ultraviolet light irradiation within the temperature which is more than the phase transition point of the cholesteric phase-smectic A phase (Ch-SmA) of the mixed liquid crystal less than 10 DEG C; spreading the multi optical polymeric group liquid crystal liquid crystal property monomer towards one side of an ultraviolet light source, so that the Ch-Sm transition temperature which is far from the ultraviolet light source is heated up to obtain a TGB phase and a Ch phase concomitant film after polymerizing, namely, the film is the macromolecule liquid crystal polarizing film with the characteristic of ultra-wide wave reflection. The preparation method of the polarizing film has simple technology and is easily produced on a largescale.

Description

Technical field [0001] The invention belongs to the field of liquid crystal material application and related technologies, and in particular relates to a method for preparing a liquid crystal polarizer with ultra-wide wave reflection characteristics. Background technique [0002] The polarizer currently widely used in liquid crystal displays is an absorbing polarizer developed in the 1920s. Although this type of polarizer is cheap, it still has many shortcomings and deficiencies, such as large optical loss and limited working environment. The reflective polarizer has broad application prospects due to its excellent performance. This type of polarizer is developed from a cholesteric ordered liquid crystal composite material, and has direct applications, such as light-enhancing films for liquid crystal displays, switchable energy-saving / privacy windows, and energy-saving reflective coatings. [0003] As we all know, cholesteric liquid crystals have many unique optical properties, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
Inventor 杨槐张立培曹晖何万里
Owner UNIV OF SCI & TECH BEIJING
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