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Color-changing reflective coating as well as preparation method and application thereof

A reflective paint and color-changing technology, which is applied in the direction of reflective/signal paint, heat-sensitive paint, epoxy resin paint, etc., can solve the problem of direct coating of non-polymer cholesteric liquid crystal materials, difficult maintenance of cholesteric phase structure, Limit application and other issues, to achieve the effect of protecting the surface of the sample, protecting the beautiful decoration and prolonging the service life

Active Publication Date: 2020-11-10
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the cholesteric phase structure in non-polymer cholesteric liquid crystal systems is difficult to maintain, non-polymer cholesteric liquid crystal materials are usually not suitable for direct coating on the surface of substrates, which limits their application in reflective coatings.

Method used

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  • Color-changing reflective coating as well as preparation method and application thereof
  • Color-changing reflective coating as well as preparation method and application thereof
  • Color-changing reflective coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A variable color reflective paint, its preparation method comprises the following steps:

[0047] S1. Preparation of cholesteric liquid crystal

[0048] Get the raw materials according to the following ratio: 79wt% nematic liquid crystal (mixed liquid crystal E7) and 21wt% chiral dopant (S811), under yellow light conditions, the above raw materials are dissolved in the solvent methylene chloride, and Stir at ℃ until the solvent therein evaporates completely, then slowly lower to room temperature to obtain cholesteric liquid crystal. The reflection characteristics of the prepared cholesteric liquid crystals were studied, and the reflection curves of the cholesteric liquid crystals at different temperatures were obtained as follows: figure 1 shown by figure 1 It can be seen that the reflection band of the cholesteric liquid crystal can change with the change of temperature.

[0049] S2, preparation of cellulose nanocrystal solution

[0050] The raw materials were weig...

Embodiment 2

[0064] A variable color reflective paint, its preparation method comprises the following steps:

[0065] S1. Preparation of cholesteric liquid crystal

[0066] Take the raw materials according to the following ratio: 79wt% nematic liquid crystal (mixed liquid crystal E7), 20wt% chiral dopant (S811) and 1wt% chiral dopant (S5011), under yellow light conditions, the above raw materials Dissolve in the solvent dichloromethane, and stir at 50°C until the solvent therein evaporates completely, then slowly lower to room temperature to obtain cholesteric liquid crystal.

[0067] S2, preparation of cellulose nanocrystal solution

[0068] The raw materials were weighed according to the following ratio: 0.05wt% cellulose nanocrystals, 0.05wt% sodium chloride and 99.9wt% deionized water, and after mixing, they were sonicated with a cell pulverizer until no precipitate was present to prepare a cellulose nanocrystal solution.

[0069] S3, preparation of Pickering emulsion

[0070] Weigh...

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Abstract

The invention discloses a color-changing reflective coating and a preparation method and application thereof. The color-changing reflective coating comprises a liquid crystal microcapsule and an adhesive, wherein the liquid crystal microcapsule comprises a core material and a shell material wrapping the surface of the core material, the core material is liquid crystal microdroplets formed by wrapping cholesteric liquid crystals with cellulose nanocrystallines, and the shell material is made of melamine resin; the refractive index of the adhesive matches the refractive index of the liquid crystal microcapsule. By means of the mode, the cholesteric phase structure in the color-changeable reflective coating is stable, the reflection waveband can be adjusted through temperature response, the liquid crystal orientation in the liquid crystal microcapsules is in central symmetry; the reflection wavelength is independent of the angle, so that the coating can change along with change of the environment temperature, and color-changeable adjustment of temperature response is achieved; according to the invention, the color changing range can be in a near-infrared band area and a visible lightband area, so that the coating is suitable for the fields of walls, intelligent windows, furniture, ornaments, automobiles and the like.

Description

technical field [0001] The invention relates to the technical field of liquid crystal reflective coatings, in particular to a color-changing reflective coating and its preparation method and application. Background technique [0002] Cholesteric liquid crystal materials have selective Bragg reflection characteristics due to their special helical structure. This special optical property makes cholesteric liquid crystals widely used in the fields of sensors, liquid crystal displays and smart infrared reflectors. [0003] The non-polymer cholesteric liquid crystal material in the cholesteric liquid crystal material is usually prepared from a nematic liquid crystal composition and a chiral dopant, and the addition of the chiral dopant distorts the structure of the nematic liquid crystal Rotate to obtain cholesteric liquid crystal. [0004] In a monodomain, the cholesteric liquid crystal molecules are arranged perpendicular to the helical axis, and in the plane perpendicular to ...

Claims

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Application Information

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IPC IPC(8): C09D5/26C09D5/33C09D163/10
CPCC09D5/26C09D5/004C09D163/10C08K9/10
Inventor 袁冬杨婷姣张振常天梁智森周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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