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Method for preparing polymer dispersed liquid crystal film

A technology for dispersing liquid crystals and polymers, applied in liquid crystals and related fields, can solve the problems of slow response speed, hysteresis of transmittance, low contrast of PDLC, etc. The effect of networking

Inactive Publication Date: 2006-07-19
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the slow response speed of PDLC, low contrast, the contradiction between driving voltage and contrast (that is, the high driving voltage caused by increasing the contrast by increasing the film thickness), the transmittance hysteresis and other factors limit its application field.

Method used

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  • Method for preparing polymer dispersed liquid crystal film
  • Method for preparing polymer dispersed liquid crystal film
  • Method for preparing polymer dispersed liquid crystal film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 5wt.% butylene glycol acrylate to hydroxypropyl acrylate containing -OH group (more than 99% in purity), and mix the monomer and liquid crystal (SLC7011-100, produced by Like Company) at a ratio of 20%: 80%. Mass ratio mixing, adding benzoin dimethyl ether and hexyl diisocyanate with 5% of the mass of the mixed monomers, stirring evenly, coating between two indium tin oxide films, and irradiating with 365nm ultraviolet light for 10 Minutes to photopolymerize the double bond in the monomer, and then heat to 120°C for 4 hours to thermally cross-link the -OH to obtain a polymer dispersed liquid crystal film. The film has good stability, good foldability, and good adhesion to the indium tin oxide film. The electro-optical performance curve of the film measured by a liquid crystal comprehensive parameter instrument is as follows: figure 1 . The photo of the monomer polymerization network under the scanning electron microscope is as follows figure 2 . -OH thermal pol...

Embodiment 2

[0024] Add 5wt.% butylene glycol acrylate to hydroxypropyl acrylate containing -OH group (more than 99% in purity), and mix the monomer and liquid crystal (SLC7011-100, produced by Like Company) at a ratio of 10%:90%. Mass ratio mixing, adding benzoin dimethyl ether and hexyl diisocyanate with 5% of the mass of the mixed monomers, stirring evenly, coating between two indium tin oxide films, and irradiating with 365nm ultraviolet light for 10 Minutes to photopolymerize the double bond in the monomer, and then heat to 120°C for 4 hours to thermally cross-link the -OH to obtain a polymer dispersed liquid crystal film. The electro-optical performance curve of the film measured by a liquid crystal comprehensive parameter instrument is as follows: image 3 . The photo of the monomer polymerization network under the scanning electron microscope is as follows Figure 4 .

Embodiment 3

[0026] Add 5wt.% butanediol acrylate to hydroxypropyl acrylate (more than 99% in purity) containing -OH groups, and mix monomers and liquid crystals (SLC7011-100, produced by Like Company) at a ratio of 50%: 50%. Mass ratio mixing, adding benzoin dimethyl ether and hexyl diisocyanate with 5% of the mass of the mixed monomers, stirring evenly, coating between two indium tin oxide films, and irradiating with 365nm ultraviolet light for 10 Minutes to photopolymerize the double bond in the monomer, and then heat to 120°C for 4 hours to thermally cross-link the -OH to obtain a polymer dispersed liquid crystal film. The electro-optical performance curve of the film measured by a liquid crystal comprehensive parameter instrument is as follows: Figure 5 . The photo of the monomer polymerization network under the scanning electron microscope is as follows Image 6 .

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Abstract

The provided preparation method for polymer dispersed liquid crystal film comprises: mixing the organic polymonomer with secondary cross-linking capacity and the liquid crystal by mass ratio as 50%:50%~10%:90%; adding light initiator and thermal initiator to stir and coat between two tin indium oxide conductive films; radiating with UV light for 1-30min at -10~50Deg to promote cross-linking reaction of light cross-linking groups and form macro molecular network; heating to 50-200Deg and holding for cross-linking reaction of thermal cross-linking groups; finally, natural cooling. This invention improves product stability and electric-photo property.

Description

technical field [0001] The invention belongs to the field of liquid crystal and related fields, and in particular provides a preparation method of a polymer dispersed liquid crystal film. Background technique [0002] Polymer Dispersed Liquid Crystal (hereinafter referred to as PDLC) film is a newly developed flat panel display device capable of displaying information. PDLC film is a new type of light control film. It disperses small molecular liquid crystals in the polymer matrix in the form of droplets. Scatter two different optical states. Since the PDLC film does not require polarizers and does not require complex manufacturing processes such as twisting and super twisting, it has the advantages of high display brightness, simple manufacture, and low manufacturing cost, and has broad application prospects. [0003] However, due to the slow response speed of PDLC, low contrast, the contradiction between the driving voltage and the contrast (that is, the high driving vol...

Claims

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Application Information

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IPC IPC(8): C09K19/38G09F9/35
Inventor 杨槐杨海莲王丽萍王立波张卫东耿君马征黄维张立培魏强原小涛
Owner UNIV OF SCI & TECH BEIJING
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