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A kind of electrically controlled dimming film and preparation method thereof

A technology of dimming film and electronic control, applied in optics, nonlinear optics, instruments, etc., can solve the problems of poor tear strength, limitation of dimming film, etc., achieve low driving voltage, excellent film formation, and broad market prospects Effect

Active Publication Date: 2021-05-07
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because PDLC requires a higher driving voltage, and PSLC has poor tear strength, the application of dimming film is limited to a certain extent.

Method used

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  • A kind of electrically controlled dimming film and preparation method thereof
  • A kind of electrically controlled dimming film and preparation method thereof
  • A kind of electrically controlled dimming film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Weigh the corresponding LC liquid crystal monomer, HPMA acrylate monomer 1, LMA acrylate monomer 2, PEGDA600 acrylate monomer 3, Bis-EMA15 acrylate monomer according to the ratio in Table 1 4. UV651 photoinitiator 1, UVI-6976 photoinitiator 2, C4V vinyl ether liquid crystal monomer and 20μm glass beads. The total mass of each material is 30g.

[0054] Table 1 Temperature control dimming film material ratio comparison table

[0055] category name Mass proportion / % liquid crystal monomer LC 62.5 Acrylic monomer 1 HPMA 16.8 Acrylate monomer 2 LMA 11.2 Acrylate monomer 3 PEGDA600 4.2 Acrylic monomer 4 Bis-EMA15 2.8 Photoinitiator 1 UV651 0.3 Photoinitiator 2 UVI-6976 0.2 Vinyl ether liquid crystal monomer C4V 1.5 glass beads 20μm glass beads 0.5

[0056] Stir the weighed sample at room temperature (20°C) to form an isotropic liquid. After stirring and mixing evenly, apply the mixed...

Embodiment 2

[0060] The components of the dimming film in this embodiment are the same as those in Embodiment 1. Stir the weighed sample at room temperature (20°C) to form an isotropic liquid. After stirring and mixing evenly, apply the mixed solution between two plastic films coated with indium tin oxide (ITO) transparent conductive film , the size of the plastic film is 0.5×0.5m 2 , and form a thin film evenly with a roller. The film is irradiated by ultraviolet light with a wavelength of 365nm at room temperature (25°C), and the ultraviolet light intensity is 0.3mw / cm 2 , the light time is 80s, then the film is connected to the electrode, 1500Hz, 10V voltage is applied, and 365nm ultraviolet light is irradiated, and the ultraviolet light intensity is 0.3mw / cm 2 , the irradiation time is 10min, and the electronically controlled dimming film is obtained. Its voltage-light transmittance curve is as follows Figure 5 shown. Depend on Figure 5 It can be seen that the light transmittan...

Embodiment 3

[0062] The components of the dimming film in this embodiment are the same as those in Embodiment 1. Stir the weighed sample at room temperature (20°C) to form an isotropic liquid. After stirring and mixing evenly, apply the mixed solution between two plastic films coated with indium tin oxide (ITO) transparent conductive film , the size of the plastic film is 0.5×0.5m 2 , and form a thin film evenly with a roller. The film is irradiated by ultraviolet light with a wavelength of 365nm at room temperature (25°C), and the ultraviolet light intensity is 90mw / cm 2 , the light time is 80s, then the film is connected to the electrode, 10000Hz, 100v voltage is applied, and 365nm ultraviolet light is irradiated, and the ultraviolet light intensity is 90mw / cm 2 , the irradiation time is 10min, and the electronically controlled dimming film is obtained. Its electro-optic side view is as Image 6 shown. The light transmittance of the electronically controlled dimming film prepared by...

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Abstract

The invention belongs to the technical field of liquid crystal materials, and in particular relates to an electronically controlled dimming film. The electronically controlled dimming film components include acrylate monomers, vinyl ether liquid crystal monomers, liquid crystal monomers, photoinitiators and glass microspheres. The preparation method is as follows: after mixing the raw materials to obtain an isotropic solution, the isotropic solution is dispersed in two conductive substrates or conductive films, and pressed into a uniform film; the first step of ultraviolet light is carried out on the obtained film. Irradiation polymerization to form a porous polymer network; apply an electric field to the obtained film, and carry out the second step of ultraviolet light irradiation polymerization to form a vertical fiber network in the formed polymer matrix, and the polymerization reaction is completed. The method provided by the invention is simple and easy to operate, and the prepared electronically controlled dimming film has excellent film-forming property and low driving voltage.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a novel distributed polymerization method and an electronically controlled dimming film prepared by the method. Background technique [0002] Dimming film is the core material for making dimming glass. It can be divided into polymer dispersed liquid crystal film PDLC (Polymer Dispersed Liquid Crystal film) and polymer stabilized liquid crystal film PSLC (Polymer Stabilized Liquid Crystal film). prepared from conductive films. When no electricity is applied, the liquid crystal molecules with dispersed orientation scatter the incident light, and the dimming film is in an opaque state; when an electric field is applied, the liquid crystal molecules are arranged in an orderly manner along the direction of the electric field, so that the incident light is transmitted, and the dimming film is in a transparent state. [0003] As a composite material of poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337G02F1/1334C08F283/06C08F220/18C08F2/48C08F2/50C08F2/44C08K7/20
CPCC08F2/44C08F2/48C08F2/50C08F283/065C08K7/20G02F1/1334G02F1/133788G02F1/13345
Inventor 杨槐王孝高红旗贺泽民汤文江
Owner PEKING UNIV