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A method for preparing polymer dispersed liquid crystal film based on vinyl ether-thiol ultraviolet light curing system

A vinyl ether, disperse liquid crystal technology, applied in chemical instruments and methods, liquid crystal materials and other directions, can solve the problems of difficult environmental pollution, strong irritation, high toxicity, etc., to improve electro-optic performance, low volatility, low toxicity Effect

Active Publication Date: 2022-01-07
深圳御光新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acrylate monomers in these systems have the disadvantages of being volatile, highly toxic, and highly irritating, so the environmental pollution problems caused by use are difficult to overcome, and their use has been restricted in some countries. Toxic and low-irritant diluent monomers become urgent issues

Method used

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  • A method for preparing polymer dispersed liquid crystal film based on vinyl ether-thiol ultraviolet light curing system
  • A method for preparing polymer dispersed liquid crystal film based on vinyl ether-thiol ultraviolet light curing system
  • A method for preparing polymer dispersed liquid crystal film based on vinyl ether-thiol ultraviolet light curing system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The polymerizable monomer and liquid crystal are mixed according to the mass ratio of 3:7, wherein the polymerizable monomer is triethylene glycol divinyl ether and tetrakis (3-mercaptopropionate) pentaerythritol ester, and the molar ratio of double bond and mercapto group is controlled 1:1, and add UV photoinitiator 1173 accounting for 5.0% of the mass of the polymerizable monomer, the liquid crystal material used is nematic liquid crystal SLC 1717 matching the refractive index of the selected polymerizable monomer; stir evenly Finally, pour the mixed system into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide (ITO), and control the thickness between the two pieces of ITO conductive glass of the liquid crystal cell to be about 20 μm; at a temperature of 273K , put the filled liquid crystal cell at a wavelength of 365nm and a light intensity of 10mW / cm 2 Under the ultraviolet light, irradiate 10min, promptly obtain the PDLC thin...

Embodiment 2

[0037] The polymerizable monomer and liquid crystal are mixed according to the mass ratio of 6:4, wherein the polymerizable monomer is triethylene glycol divinyl ether and tetrakis (3-mercaptopropionate) pentaerythritol ester, and the molar ratio of double bond and mercapto group is controlled 1:1, and add UV photoinitiator 1173 accounting for 5.0% of the mass of the polymerizable monomer, the liquid crystal material used is nematic liquid crystal SLC 1717 matching the refractive index of the selected polymerizable monomer; stir evenly Finally, pour the mixed system into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide (ITO), and control the thickness between the two pieces of ITO conductive glass of the liquid crystal cell to be about 20 μm; at a temperature of 273K , put the filled liquid crystal cell at a wavelength of 365nm and a light intensity of 10mW / cm 2 Under the ultraviolet light, irradiate 10min, promptly obtain the PDLC thin...

Embodiment 3

[0041] The polymerizable monomer and liquid crystal are mixed according to the mass ratio of 3:7, wherein triethylene glycol divinyl ether is selected as the vinyl ether polymerizable monomer, and monomers with different functionalities are selected as the thiol monomer, respectively. For 3,6-dioxa-1,8-octanedithiol, trimethylolpropane tris(3-mercaptopropionate) and inositol hexa(mercaptopropionate), controlled moles of double bonds and mercapto groups The ratio is 1:1, and the ultraviolet photoinitiator 1173 accounting for 5.0% of the mass of the polymerizable monomer is added, and the liquid crystal material used is nematic liquid crystal SLC 1717 matched with the refractive index of the selected polymerizable monomer; stirring After uniformity, pour the mixed system into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide (ITO), and control the thickness between the two pieces of ITO conductive glass of the liquid crystal cell to be abou...

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Abstract

The invention discloses a method for preparing a polymer-dispersed liquid crystal film based on a vinyl ether-thiol ultraviolet light curing system. The method comprises the following steps: combining a polymerizable monomer and The liquid crystal is mixed according to the mass ratio of 3:7-6:4, and an ultraviolet photoinitiator is added, wherein the polymerizable monomers are vinyl ether monomers and thiol monomers, and the molar ratio of double bonds and mercapto groups is controlled to be 0.8:1 ‑1.2:1, the amount of ultraviolet photoinitiator added is 3.0%‑5.0% of the total mass of polymerizable monomers; after stirring evenly, pour the mixed system into a liquid crystal made of two pieces of conductive glass coated with indium tin oxide In the box; irradiate the filled liquid crystal box under ultraviolet light for 3-20 minutes, and prepare a polymer dispersed liquid crystal film after ultraviolet polymerization. The polymerized monomer used in the invention is not volatile, has low toxicity and little irritation; it has lower driving voltage, faster response speed and higher contrast.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal application, and provides a method for preparing a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, PDLC) film material based on a vinyl ether-thiol ultraviolet light curing system. The prepared film material can be widely used in liquid crystal In the research of display, smart glass and related fields. Background technique [0002] Polymer Dispersed Liquid Crystal (hereinafter referred to as PDLC) is a composite material formed by uniformly dispersing liquid crystal droplets in a polymer matrix. Because of its special electro-optic response performance, it has become a research hotspot in the field of flat panel display. PDLC has the advantages of high contrast, simple preparation, and no need for polarizers. Therefore, PDLC film materials have broad application prospects in smart glass, tunable filters, scattering polarizers, switchable holographic recording materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F116/12C08F2/44C08F2/48C09K19/54
CPCC09K19/542C08F2/44C08F2/48C08F116/12C09K2019/546
Inventor 杨槐张翠红黄建华郭姝萌周乐胡威陈梅梁霄房华张逸杨捷
Owner 深圳御光新材料有限公司
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