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A kind of preparation method of pdlc film based on liquid crystal/polymer composite material system

A technology of composite materials and liquid crystal materials, which is applied in the field of UV curing system of crystal/polymer composite materials, can solve the problems of reducing the brightness and contrast of display devices, so as to reduce the anchoring effect, increase the contrast ratio and reduce the driving voltage Effect

Active Publication Date: 2021-11-23
苏州英荟虹彩薄膜材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Current liquid crystal displays use polarizers to transmit and refract light, but polarizers reduce the brightness and contrast of the display device

Method used

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  • A kind of preparation method of pdlc film based on liquid crystal/polymer composite material system
  • A kind of preparation method of pdlc film based on liquid crystal/polymer composite material system
  • A kind of preparation method of pdlc film based on liquid crystal/polymer composite material system

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Experimental program
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Effect test

Embodiment 1

[0034]The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate). Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 35.0:65.0. The mass ratio of lauryl methacrylate, trimethylolpropane triacrylate, pentaerythritol tetrakis(3-mercaptopropionate) and vinyl ether is 24.0:6.0:2.0:3.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the principle of siphon, and then heated at room temperature with a light intensity of 2mw / cm 2 , irradiate with ultraviolet light with a wavelength of 365nm for 5 minutes, then carry out two-step polymerization at room temperature with an electric field intensity of 100V and an electric field...

Embodiment 2

[0038] The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate, pentaerythritol tetrakis(3-mercaptopropionate), and vinyl ether. Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 35.0:65.0. The mass ratio of lauryl methacrylate, trimethylolpropane triacrylate, pentaerythritol tetrakis(3-mercaptopropionate) and vinyl ether is 20.0:10.0:2.0:3.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the principle of siphon, and then heated at room temperature with a light intensity of 2mw / cm 2 , irradiated with ultraviolet light with a wavelength of 365nm for 8 minutes, and then at room temperature, the electric field intensity is 100V, and the electric field frequency is ...

Embodiment 3

[0042] The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate, pentaerythritol tetrakis(3-mercaptopropionate), and vinyl ether. Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 35.0:65.0. The mass ratio of lauryl methacrylate, trimethylolpropane triacrylate, pentaerythritol tetrakis(3-mercaptopropionate) and vinyl ether is 23.0:5.0:2.0:5.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the principle of siphon, and then heated at room temperature with a light intensity of 2mw / cm 2 , irradiate with ultraviolet light with a wavelength of 365nm for 5 minutes, then carry out two-step polymerization at room temperature with an electric field intensity of 100V and an...

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Abstract

The invention provides a method for preparing a PDLC film based on a liquid crystal / polymer composite material system. The details are as follows: After mixing the liquid crystal, photopolymerizable monomer and photoinitiator uniformly according to a certain mass ratio, the mixture is poured into the liquid crystal cell by using the siphon principle, and the thickness of the liquid crystal cell is controlled at 10-30 μm by a plastic spacer. Then irradiate with ultraviolet light for 1 to 5 minutes at room temperature to form a polymer dispersed liquid crystal film. Then, the formed polymer-dispersed liquid crystal film is subjected to secondary photopolymerization in an electric field. The introduction of thiol monomer and vinyl ether monomer in the present invention greatly improves the photoelectric performance of the prepared PDLC film; by adjusting the mass ratio and polymerization conditions between acrylate, thiol and vinyl ether, the polymer mesh is adjusted The size of the liquid crystal and the size of the liquid crystal droplet have prepared a polymer-dispersed liquid crystal film with a smaller driving voltage, more energy-saving, and stable performance.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal applications, and relates to a preparation method of a PDLC film based on a liquid crystal / polymer composite material system, specifically a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal) prepared by an ultraviolet light curing system based on a liquid crystal / polymer composite material. Liquid Crystal, PDLC) film material method, the film material prepared can be widely used in liquid crystal display, smart glass, energy-saving building materials, automobile decoration and related fields. Background technique [0002] Polymer dispersed liquid crystal material is a composite material formed by uniformly dispersing nematic liquid crystal droplets in a polymer matrix. The optical axis of each liquid crystal droplet is in a preferred orientation, while the optical axes of different droplets are in a random orientation state. A nematic liquid crystal material with a dielect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1334C08F283/04C08F220/18C08F222/14C08J5/18
CPCC08F283/04C08J5/18C08J2351/08G02F1/1334C08F220/1812
Inventor 李克轩张卫东
Owner 苏州英荟虹彩薄膜材料科技有限公司
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