A method for preparing liquid crystal dimming film by thermal-ultraviolet stepwise polymerization

A liquid crystal dimming film, step-by-step polymerization technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of difficult and flexible large-area processing, poor flexibility, low tear strength, etc., to reduce anchoring effect, response High speed and excellent mechanical properties

Active Publication Date: 2020-09-01
苏州英荟虹彩薄膜材料科技有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with PDLC, the polymer matrix content of PSLC is less than 10%, so the tear strength between the two base films is lower, the flexibility is poor, and it is difficult to perform flexible large-area processing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing liquid crystal dimming film by thermal-ultraviolet stepwise polymerization
  • A method for preparing liquid crystal dimming film by thermal-ultraviolet stepwise polymerization
  • A method for preparing liquid crystal dimming film by thermal-ultraviolet stepwise polymerization

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] 2. The preparation method of the liquid crystal dimming film provided by the invention comprises the following steps:

[0048] (1) Mix the liquid crystal material, epoxy monomer, epoxy curing agent, accelerator, liquid crystal UV light polymerizable monomer, initiator and spacer particles uniformly according to the required ratio, and place the formed isotropic liquid material A thin film is formed between a conductive film coated with indium tin oxide (ITO).

[0049] (2) Thermally polymerize the film, initiate the cross-linking reaction of epoxy monomer and epoxy curing agent through thermal polymerization to form a polymer matrix, form a microphase separation with liquid crystal photopolymerizable monomer and liquid crystal, and obtain a conductive film . The specific conditions of the thermal polymerization are as follows: within the range of room temperature to 100° C., the polymerization reaction takes 1 to 24 hours.

[0050] (3) Applying an electric field to the...

Embodiment

[0054] 1. Material description:

[0055] (1) The cholesteric liquid crystal material used in this embodiment is obtained by adding a chiral additive S811 to the nematic liquid crystal E8. Wherein, the mass ratio of E8 and S811 is 97:3; the preparation method is as follows: mix E8 and S811 and stir well. The molecular structure and content of each component of the nematic liquid crystal E8 are shown in Table 1.

[0056] Table 1 Molecular structure and content comparison table of each component of liquid crystal material E8

[0057]

[0058]

[0059] (2) The molecular structures of the materials involved in this embodiment are shown in Table 2.

[0060] Molecular structure comparison table of each material used in Table 2

[0061]

[0062]

[0063] 2. Prepare the liquid crystal dimming films required by the two groups, and set up a control group at the same time. The materials required for each group are shown in Table 3.

[0064] Table 3 formula ratio table of e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of liquid crystal materials, and concretely relates to a method for preparing a liquid crystal dimming film with a low driving voltage by thermal-ultraviolet stepwise polymerization. The method concretely comprises the following steps: uniformly mixing a liquid crystal material, an epoxy monomer, an epoxy curing agent, a promoter, a liquid crystalline ultraviolet-polymerizable monomer, an initiator and spacer particles to obtain an isotropic liquid material; placing the isotropic liquid material in the middle of a conductive film coated with indium tin oxide in order to form a film; thermally polymerizing the film to form a porous polymer matrix in order to obtain a conductive film; and applying an electric field to the conductive film to make liquid crystal molecules in a vertical orientation state, and performing ultraviolet polymerization on the conductive film to construct a vertically oriented polymer network inside meshes in order to obtain the target electrically controlled liquid crystal trimming film. The liquid crystal trimming film obtained in the present invention has an excellent electrooptic characteristic and a good flexibility.

Description

technical field [0001] The invention belongs to the field of liquid crystal materials, and in particular relates to a method for preparing a liquid crystal dimming film with low driving voltage through thermal-ultraviolet stepwise polymerization. Background technique [0002] The anisotropic structure and characteristics of liquid crystals make it of far-reaching research significance in basic theoretical research and application device development. Among them, the research and development of functional liquid crystal materials is a hot topic. Among the new functional liquid crystal materials, polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, referred to as PDLC) and polymer stabilized liquid crystal (Polymer Stabilized Liquid Crystal, referred to as PSLC) both show good application characteristics. [0003] In the PDLC film, the liquid crystal is uniformly dispersed in the polymer matrix in the form of droplets. In the absence of an electric field, the di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L29/10C08K5/10C08K5/315C08J5/18C08G59/22C08G59/66C08F116/12G02F1/1337G02F1/137G02F1/139
CPCC08F116/12C08G59/226C08G59/66C08J5/18C08J2363/00C08J2429/10C08K5/10C08K5/315G02F1/133788G02F1/13718G02F1/139
Inventor 杨槐李春昕陈梅张兰英梁霄王孝
Owner 苏州英荟虹彩薄膜材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap