Preparation method of polymer dispersed liquid crystal film

A technology for dispersing liquid crystals and polymers. It is applied in liquid crystal materials, chemical instruments and methods, instruments, etc., and can solve the problems of not being widely used and large equipment.

Active Publication Date: 2012-07-18
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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  • Preparation method of polymer dispersed liquid crystal film
  • Preparation method of polymer dispersed liquid crystal film
  • Preparation method of polymer dispersed liquid crystal film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The thermally polymerizable monomer selected is bisphenol A epoxy resin (E-54), which is mixed with aliphatic polyamine curing agent triethylenetetramine (TETA) according to the mass ratio of 1.00:0.13 to form a polymer Monomer system. Then the nematic liquid crystal SLC1717 (T NI =365.2K,n o =1.519,n e =1.720) into the polymerized monomer system, the content of SLC1717 added accounted for 70.0% of the total mass of the system; glass microspheres with a diameter of 15.0 microns were added to the polymerized monomer system, and the content of glass microspheres accounted for the total mass of the system 0.5%. Under heating conditions (about 50.0°C), the system clarifies to the clearing point and forms an isotropic liquid. Use a vortex shaker to mix the system evenly. After the system reaches the clearing point, apply it between two transparent plastic conductive films coated with indium tin oxide (ITO), and press it to about 15.0 microns with a roller. After uniform...

Embodiment 2

[0023] The thermally polymerizable monomers selected are bisphenol A-type epoxy resin (E-54) and aliphatic glycidyl ether epoxy resin 1,6-hexanediol diglycidyl ether (HGDE), and according to the mass ratio (E-54: HGDE=2.0:8.0) Mix the two monomers evenly, and then mix the mixed monomers with aliphatic polyamine curing agent triethylenetetramine (TETA) at a mass ratio of 1.00:0.13 to form Polymerized monomer system. Then the nematic liquid crystal SLC1717 (T NI =365.2K,n o =1.519,n e=1.720) into the polymerized monomer system, the content of SLC1717 added accounted for 75.0% of the total mass of the system; glass microspheres with a diameter of 15.0 microns were added to the polymerized monomer system, and the content of glass microspheres accounted for the total mass of the system 0.5%. Under heating conditions (about 50.0°C), the system reaches the clearing point and forms an isotropic liquid. Use a vortex shaker to mix the system evenly. After the system reaches the cle...

Embodiment 3

[0027] The thermally polymerizable monomers selected are bisphenol A-type epoxy resin E-54 and aliphatic glycidyl ether epoxy resin 1,6-hexanediol diglycidyl ether (HGDE), and according to the mass ratio (E -54:HGDE=1.0:9.0) Mix the two monomers evenly, and then mix the mixed monomers with the aliphatic polyamine curing agent triethylenetetramine (TETA) at a mass ratio of 1.00:0.13 to form a polymeric monomer body system. Then the nematic liquid crystal SLC1717 (T NI =365.2K,n o =1.519,n e =1.720) into the polymerized monomer system, the content of SLC1717 added accounted for 75% of the total mass of the system; glass microspheres with a diameter of 15 microns were added to the polymerized monomer system, and the content of glass microspheres accounted for the total mass of the system 0.5%. Under heating conditions (about 50°C), the system reaches the clearing point and forms an isotropic liquid. Use a vortex shaker to mix the system evenly. After the system reaches the c...

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Abstract

The invention provides a preparation method of a polymer dispersed liquid crystal film, is applied to preparation of electronic control intelligent glass and belongs to the field of liquid crystal material application. The method comprises the steps of: uniformly mixing thermal polymerizable monomers, curing agents, nematic liquid crystal and glass microbeads in certain mass ratio; subsequently clamping the mixture between two conductive films plated with indium tin oxide at the temperature 0.5-20.0 DEG C higher than the clearing temperature of the liquid crystal phase of the thermal polymerizable monomers/curing agents/liquid crystal composite materials; compressing with a roll shaft uniformly so as to form a film layer of 10.0-15.0 microns in thickness; heating for 5.0-7.0 hours at 70.0-90.0 DEG C; and finally curing so as to form the polymer dispersed liquid crystal film. The preparation method provided by the invention has the advantages that the thermal stability of a polymer network is enhanced; the flexibility of a PDLC (Polymer Dispersed Liquid Crystal) film is improved; and the mesh size of a macromolecule network is regulated by selecting the optimal ratio of two monomers, so that the purpose of improving the thermal stability and contrast ratio of polymer dispersed liquid crystal film materials and the binding force between the macromolecule network and an ITO (Indium-Tin Oxide) film is reached.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal application, and in particular relates to a thermal polymerization phase separation method of a polymer dispersed liquid crystal (PDLC) film material, and the prepared film material can be widely used in liquid crystal display and other fields. Background technique [0002] PDLC film is a composite material formed by uniformly dispersing nematic liquid crystal droplets in a polymer matrix. When preparing PDLC film, the mixed solution of liquid crystal and polymerized monomer is under the condition of heat or light, and the polymerized monomer undergoes polymerization reaction, the molecular weight gradually increases, and the compatibility with liquid crystal decreases, resulting in the gradual precipitation of liquid crystal in the system. [0003] Because liquid crystal molecules have optical anisotropy and dielectric anisotropy, PDLC film materials have remarkable electro-optic properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/22C08K13/04C08K7/20C08L63/00C08L63/02C09K19/54G02F1/1334
Inventor 杨槐王静静曹晖宋平刘芳陈杭萍
Owner UNIV OF SCI & TECH BEIJING
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