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Method for preparing epoxy-based polymer dispersed liquid crystal film material

A technology for dispersing liquid crystals and thin film materials, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of not being widely used, large equipment, etc., to improve the open-state transmittance, reduce the refractive index, and reduce the viscosity Effect

Inactive Publication Date: 2011-05-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid crystal content in the PDLC film liquid crystal droplets prepared by electron beam curing is generally less than that used by ultraviolet light curing, but the equipment invested in electron beam curing is large, so it cannot be widely used

Method used

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  • Method for preparing epoxy-based polymer dispersed liquid crystal film material
  • Method for preparing epoxy-based polymer dispersed liquid crystal film material
  • Method for preparing epoxy-based polymer dispersed liquid crystal film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The selected thermal polymerization monomer is aliphatic glycidyl ether epoxy resin - bisphenol F epoxy resin DGEBF with rigid groups, liquid crystal SLC1717, curing agent 1,8-diamino-3,6-dioxahexyne Alkane EDBEA (Alfa Aesar), glass microspheres (SP-200, Sekisuichemical Co.LTD.). DGEBF / curing agent / liquid crystal are mixed evenly according to the mass ratio of 35.8 / 14.5 / 50.0. The thermally polymerizable monomer, liquid crystal, and curing agent mixture are evenly sandwiched between two layers of ITO-coated conductive plastic films, and cured in a drying oven at a constant temperature of 100°C for 8 hours to obtain the PDLC film to be prepared. figure 1 It is a scanning electron microscope picture of the PDLC thin film prepared in Example 1.

Embodiment 2

[0025] The selected thermal polymerization monomers are aliphatic glycidyl ether epoxy resin - polyethylene glycol diglycidyl ether EGDE, bisphenol F epoxy resin DGEBF containing rigid groups, liquid crystal SLC1717, curing agent 1,8-di Amino-3,6-dioxaoctane EDBEA (Alfa Aesar), glass microspheres (SP-200, Sekisui chemical Co. LTD.). EGDE / DGEBF / curing agent / liquid crystal are mixed evenly according to the mass ratio of 16.3 / 20.8 / 13.0 / 50.0. The thermally polymerizable monomer, liquid crystal, and curing agent mixture are evenly sandwiched between two layers of ITO-coated conductive plastic films, and cured in a drying oven at a constant temperature of 100°C for 8 hours to obtain the PDLC film to be prepared. figure 2 It is a scanning electron microscope picture of the PDLC thin film prepared in Example 2.

Embodiment 3

[0027]The selected thermal polymerization monomers are aliphatic glycidyl ether epoxy resin - polyethylene glycol diglycidyl ether EGDE, bisphenol F epoxy resin DGEBF containing rigid groups, liquid crystal SLC1717, curing agent 1,8-di Amino-3,6-dioxaoctane EDBEA (Alfa Aesar), glass microspheres (SP-200, Sekisui chemical Co. LTD.). EGDE / DGEBF / curing agent / liquid crystal are mixed evenly according to the mass ratio of 8.4 / 27.7 / 14.0 / 50.0. The thermally polymerizable monomer, liquid crystal, and curing agent mixture were evenly sandwiched between two layers of ITO-coated conductive plastic films, and cured in a drying oven at a constant temperature of 90°C for 7 hours to obtain the PDLC film to be prepared. image 3 It is a scanning electron microscope picture of the PDLC thin film prepared in Example 3.

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PUM

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Abstract

The invention relates to a method for preparing an epoxy-based polymer dispersed liquid crystal film material, belonging to the application field of liquid crystal materials. The method comprises the following steps: evenly mixing liquid crystal, a thermal polymerization monomer, a curing agent and glass microspheres; then clamping the obtained mixture between two conductive films plated with indium tin oxide, and then uniformly pressing with a roll shaft to form a film layer with the thickness of 20 microns-30 microns; and carrying out thermal curing for 6-8 hours at the temperature of 80-100 DEG C, and then preparing the polymer dispersed liquid crystal film. In the method, aliphatic glycidyl ether epoxy resin is used to improve the electric-optical property of the polymer dispersed liquid crystal (PDLC) film, thus by the addiction of the monomer, the viscosity of the mixing system is reduced, the sizes of the meshes of the polymer are regulated and the flexibility of a network and the binding power of the material are improved; and the refractive index of a polymer substrate is reduced because of the molecular structure of the epoxy resin and the fired state transmissivity is improved, thereby improving the contrast ratio and improving the electric-optical property of the PDLC film. In addition, by using the method, the content of the liquid crystal is reduced, and the used substrate materials are cheap so that the preparation cost is greatly reduced.

Description

technical field [0001] The invention belongs to the application field of liquid crystal materials, and relates to a preparation method of a PDLC thin film material, in particular to a preparation method of an epoxy-based polymer dispersed liquid crystal thin film material. Background technique [0002] Polymer Dispersed Liquid Crystal (PDLC) is an electro-optic film material. The PDLC film is a physical and chemical method that precipitates liquid crystals from the mixture mixed with the prepolymer, and distributes them in the solid transparent polymer matrix in the form of micron-sized droplets. Between two substrates plated with an indium-tin oxide (ITO) conductive layer is a PDLC film of a certain thickness, and the liquid crystal droplets are randomly distributed in the polymer network and present a certain self-organized configuration. . Due to the strong optical anisotropy and dielectric anisotropy of liquid crystal molecules, this material has remarkable electro-opt...

Claims

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Application Information

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IPC IPC(8): C09K19/54G02F1/1334
Inventor 杨槐孟庆勇张婷婷曹晖鹿岛美纪
Owner UNIV OF SCI & TECH BEIJING