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Method for preparing cholesteric liquid crystal functional film by heating-ultraviolet light stepwise polymerization

A cholesteric liquid crystal, step-by-step polymerization technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve problems affecting product economic benefits, reducing product performance and quality, and insufficient adhesion

Active Publication Date: 2019-04-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the preparation process of trans-type and bistable PDLC films, it often occurs that the adhesion between the liquid crystal / polymer composite material and the two layers of indium tin oxide (ITO) plastic films is not tight enough to cause the ITO plastic film to detach. This has brought great difficulties to large-scale process production, which not only reduces the performance and quality of products, but also seriously affects the economic benefits of products.

Method used

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  • Method for preparing cholesteric liquid crystal functional film by heating-ultraviolet light stepwise polymerization
  • Method for preparing cholesteric liquid crystal functional film by heating-ultraviolet light stepwise polymerization
  • Method for preparing cholesteric liquid crystal functional film by heating-ultraviolet light stepwise polymerization

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Experimental program
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Effect test

Embodiment 1

[0061] The liquid crystalline ultraviolet photopolymerization monomer (compound 1) that is 3wt% by weight and the cholesteric phase liquid crystal mixture that is 97wt% by weight (the cholesteric phase liquid crystal mixture that selects in the present invention is the chiral phase that contains 14% by weight Additive S811 is mixed with nematic phase liquid crystal mixture, the composition of nematic phase liquid crystal mixture is shown in Table 1) and photoinitiator Irgacure651 are uniformly mixed, as the ultraviolet polymerizable monomer liquid crystal composite system, the addition amount of photoinitiator is liquid crystal ultraviolet 5% of the total mass of the photopolymerizable monomer and the cholesteric liquid crystal mixture; 50% by weight of polythiol curing agent Capcure 3-800 and 50% by weight of E51 containing conjugated epoxy groups Epoxy resin / glycidyl ester ERL-4221 epoxy resin is mixed evenly as a thermal polymerization composite system; the thermal polymeriz...

Embodiment 2

[0067] The liquid crystalline ultraviolet photopolymerization monomer (compound 2) that is 1wt% by weight and the cholesteric liquid crystal mixture that is 99wt% by weight (the cholesteric liquid crystal mixture that selects in the present invention is the chiral liquid crystal that contains 14% by weight Additive R811 is mixed with nematic phase liquid crystal mixture, the composition of nematic phase liquid crystal mixture is shown in Table 1) and photoinitiator Irgacure651 are evenly mixed, as the ultraviolet polymerizable monomer liquid crystal composite system, the addition amount of photoinitiator is liquid crystalline ultraviolet 0.01% of the total mass of photopolymerizable monomer and cholesteric liquid crystal mixture; 20% by weight of polythiol type curing agent Capcure 3-800 and 80% by weight of E51 containing conjugated epoxy groups Epoxy resin / glycidyl ester ERL-4221 epoxy resin is mixed evenly as a thermal polymerization composite system; the thermal polymerizat...

Embodiment 3

[0070] The liquid crystalline ultraviolet photopolymerizable monomer (compound 3) that is 6wt% by weight and the cholesteric phase liquid crystal mixture that is 94wt% by weight (the cholesteric phase liquid crystal mixture that selects in the present invention is the chiral liquid crystal that contains 14% by weight Additive R1011 is mixed with nematic phase liquid crystal mixture, the composition of nematic phase liquid crystal mixture is shown in Table 1) and photoinitiator Irgacure651 are evenly mixed, as the ultraviolet polymerizable monomer liquid crystal composite system, the addition amount of photoinitiator is liquid crystalline ultraviolet 6% of the total mass of the photopolymerizable monomer and the cholesteric liquid crystal mixture; 40% by weight of polythiol curing agent Capcure 3-800 and 60% by weight of E51 containing conjugated epoxy groups Epoxy resin / glycidyl ester ERL-4221 epoxy resin is mixed evenly as a thermal polymerization composite system; the thermal...

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Abstract

The invention discloses a method for preparing Cholesteric liquid crystal functional film using a heating-ultraviolet light step-by-step polymerization method comprising following steps: cholesteric liquid crystal mixture, liquid crystalline ultraviolet light polymerizable monomer, photoinitiator, thermally polymerized monomer and glass microspheres are mixed evenly and sandwiched between two transparent conductive films coated with tin indium oxide; the mixture is evenly pressed with rollers; heat cure is firstly performed; after the thermal polymerization monomer is completed, the cholesteric liquid crystal is oriented in parallel by the action of the electric field, and then irradiated with ultraviolet light, solidified into a trans or bistable PDLC film. The trans or bistable PDLC film material prepared by the invention can control the polymer network structure through the deployment of the UV polymerized monomer and the thermally polymerizable monomer to improve the electro-optical performance of the PDLC film and enhance the adhesion between liquid crystal / polymer composite material and the two layers of ITO plastic film, and improve the thermal stability of trans and bistable PDLC films.

Description

technical field [0001] The invention belongs to the field of functional materials. Specifically, the invention particularly relates to a method for preparing a cholesteric liquid crystal functional thin film by heating-ultraviolet light stepwise polymerization. Background technique [0002] Smart glass is a kind of glass whose optical properties such as transmittance, reflectance or color can be adjusted by electric field, temperature, magnetic field, etc. The polymer dispersed liquid crystal (Polymer dispersed liquid crystals, PDLC) film used in the present invention is a liquid crystal / polymer composite electro-optical material. PDLC is used in the field of electronically controlled smart glass, and the glass can be switched between transparent and opaque states by adjusting the external electric field. Electronically controlled smart glass has the advantages of energy saving, environmental protection, privacy protection, safety, sound insulation, and convenient regulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1334C09K19/46
CPCC09K19/46G02F1/1334
Inventor 杨槐王慧慧陈梅王茜张翠红郭姝萌粱霄周乐胡威
Owner PEKING UNIV
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