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Optical performance application of thermotropic liquid crystal cholest and precholest polymer

A technology of cholesteric liquid crystals and optical properties, applied in applications, liquid crystal materials, home appliances, etc., to achieve the effect of reasonable technology and wide application prospects

Inactive Publication Date: 2010-07-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There is no report on the use of cholesteric and pre-cholesteric liquid crystal polymers to make light-shielding materials, optical locks or optical switches, color polarizers, camouflage materials, color-changing pigments for painting or advertising

Method used

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  • Optical performance application of thermotropic liquid crystal cholest and precholest polymer
  • Optical performance application of thermotropic liquid crystal cholest and precholest polymer
  • Optical performance application of thermotropic liquid crystal cholest and precholest polymer

Examples

Experimental program
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Effect test

example 1

[0041] Example 1: Use cholesteric liquid crystal polymers or polymers with pre-cholesteric phase properties that selectively reflect different wavelengths (that is, different colors) in the visible light region at room temperature, and dissolve in ethanol, ethyl acetate, acetone, and cyclohexanone. In the mixed solvent, its weight ratio is ethanol: ethyl acetate: acetone: cyclohexanone = 50: 30: 15: 5, based on the raw material polymer, add light stabilizer 2 (2'-hydroxyl-3 ', 5'-di-tert-pentylphenyl) benzotriazole is 0.05% by weight, adding antioxidant 3,3-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate is 0.06% by weight, adjust the viscosity of the solution to make ink; select the bottom layer to be black glass, and use the above ink to screen print on the bottom layer to form a liquid crystal layer. The thickness of the liquid crystal coating is 20 ± 5 μm. After infrared light is irradiated to melt the liquid crystal coating, it is naturally cooled to room tempera...

example 2

[0042] Example 2: If image 3 As shown, select cholesteric liquid crystal polymer or pre-cholesteric liquid crystal polymer powder, based on which, add light stabilizer 2 (2'-hydroxy-3', 5'-di-t-pentylphenyl) benzene Triazole is 0.05% by weight, adding antioxidant 3,3-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate is 0.06% by weight, made powder coating, through spraying or scraping Put it on the bottom layer, then heat or light to make the polymer powder melt and develop color, cool to room temperature, and directly use it as an anti-counterfeiting coating. The thickness of the liquid crystal layer is 30±5μm, and the bottom layer is transparent plastic polymethyl methacrylate.

example 3

[0043] Example 3: Other conditions are the same, on the basis of Example 1, add a protective layer on the liquid crystal layer, such as figure 2 shown.

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Abstract

The present invention relates to the optical performance and application of thermotropic cholest and precholest liquid crystal polymer. The thermotropic cholest or precholest liquid crystal polymer is dissolved in solvent, and optical stabilizer and antioxidant are added to regulate viscosity to prepare ink. Powder of thermotropic cholest or precholest liquid crystal polymer is painted onto product, heated or irradiated with light to melt and develop, and cooled to room temperature. The ink or the powder is used in producing liquid crystal layer in making anti-fake device, optical shield material, optical lock or switch, camouflage paint, color Polaroid or drawing works. The present invention applies the thermotropic cholest or precholest liquid crystal polymer with selective light reflecting and transmitting performance, circular dichroism, optical rotation and other optical performance as well as filming property, etc. in optics, anti-fake, military and other fields.

Description

technical field [0001] The present invention relates to the application method of the optical properties of thermotropic cholesteric and precholesteric liquid crystal polymers, in particular to the application of the optical properties of thermotropic cholesteric and precholesteric liquid crystal polymers to anti-counterfeiting devices, light shielding materials, optical locks or Switches, color polarizers, camouflage materials, color shifting pigments. Background technique [0002] Liquid crystal polymers with cholesteric phase and pre-cholesteric phase (pre-cholesteric liquid crystal phase refers to the phase state of liquid crystals between the cholesteric phase and the isotropic phase, and liquid crystal polymers with this phase state are called pre-cholesteric phases. Steroidal liquid crystal polymer, the pre-cholesteric phase includes blue phase I, blue phase II, blue phase III and the phase state that has not yet been determined. All have selective reflection and sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/38C09D11/02C09D11/50
Inventor 张宝砚孟凡宝贾迎钢胡建设丛越华
Owner NORTHEASTERN UNIV LIAONING