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Preparation method of carbon black doped liquid crystal microcapsules

A microcapsule and liquid crystal technology, applied in the fields of fine chemical industry and material science, can solve the problems of reduced color brightness, insufficient color, poor brightness of liquid crystal microcapsules, etc., and achieves the effects of improved brightness, simple operation and environmental friendliness.

Active Publication Date: 2019-02-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, after microencapsulation, compared with planar cholesteric liquid crystals, the color development of microencapsulated liquid crystals is more complicated, and the color brightness will be reduced. After coating, the displayed color is not obvious enough under naked eye conditions. , so that the brightness of the liquid crystal microcapsules is poor, which restricts the application of this type of helical liquid crystal

Method used

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  • Preparation method of carbon black doped liquid crystal microcapsules
  • Preparation method of carbon black doped liquid crystal microcapsules
  • Preparation method of carbon black doped liquid crystal microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix 3g of cholesteryl nonanoate and 7g of cholesteryl oleyl carbonate and heat until they are completely dissolved and become transparent. After stirring for 2 hours at this temperature, cool down until the mixed liquid crystal appears color or turbid, and then heat up to just Transparent, stirred at a constant temperature for 4 hours, added 0.02 g of carbon black modified with γ-aminopropyltriethoxysilane, and continued to stir at a constant temperature for 4 hours to obtain a liquid crystal mixture;

[0028] (2) Microencapsulation: Keep the liquid crystal mixture at a certain temperature and add it dropwise to the aqueous solution of gum arabic at the same temperature under the action of mechanical stirring, emulsify at a high speed to prepare a liquid crystal dispersion, and then slowly add the aqueous gelatin solution dropwise to obtain a liquid crystal reaction system , wherein the liquid crystal mixture accounts for 5% of the mass fraction of the liquid crystal...

Embodiment 2

[0033] (1) Mix 1g of cholesteryl propionate, 1.5g of cholesteryl oleate, 2g of cholesteryl benzoate, and 0.5g of cholesteryl ethyl carbonate and heat until just completely dissolved. After stirring for 2 hours at this temperature, After the temperature is lowered until the mixed liquid crystal is colored or turbid, the temperature is raised until it is just transparent, and stirred at a constant temperature for 4 hours, and 0.05 g of carbon black modified with γ-glycidyloxypropyltrimethoxysilane is added thereto, and the constant temperature is stirred for 4 hours. Obtain liquid crystal mixture;

[0034] (2) Microencapsulation: Keep the liquid crystal mixture at a certain temperature and add it dropwise to the gum arabic and dispersant aqueous solution at the same temperature under mechanical stirring, emulsify at a high speed, and prepare a liquid crystal dispersion, then slowly add the gelatin aqueous solution dropwise to obtain Liquid crystal reaction system, wherein the li...

Embodiment 3

[0039] (1) Mix 3.8g of CB15 and 6.2g of E7 and heat until they are completely dissolved. After stirring at this temperature for 2 hours, cool down until the mixed liquid crystal appears color or turbid, then heat up to just transparent, stir at constant temperature for 4 hours, and add 0.05 g of carbon black modified with γ-glycidyl etheroxypropyltrimethoxysilane, and continued constant temperature stirring for 4 hours to obtain a liquid crystal mixture;

[0040] (2) Microencapsulation: Keep the liquid crystal mixture at a certain temperature and add it dropwise to the gum arabic and dispersant aqueous solution at the same temperature under mechanical stirring, emulsify at a high speed, and prepare a liquid crystal dispersion, then slowly add the gelatin aqueous solution dropwise to obtain Liquid crystal reaction system, wherein the liquid crystal mixture accounts for 10% of the mass fraction of the liquid crystal reaction system, gum arabic accounts for 5% of the mass fraction...

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Abstract

The invention discloses a preparation method of carbon black doped liquid crystal microcapsules, and belongs to the technical fields of fine chemical engineering and material science. The carbon blackdoped liquid crystal microcapsule is characterized in that a liquid crystal is doped with modified carbon black which exists in the microcapsules for absorbing transmitted visible light, so that thetransmitted light penetrating through the liquid crystal is reduced, human eyes mainly see selectively-reflected light of the liquid crystal, and liquid crystal microcapsules are more remarkable in color. The method is easy to operate, and is environmentally friendly. The liquid crystal microcapsules prepared by the method are remarkably improved in brightness, can present remarkable color under naked eyes, and can be widely applied in the fields of body temperature precise measurement, liquid crystal displays, electronic paper, liquid crystal lasers, anti-counterfeit packages and smart textile.

Description

technical field [0001] The invention belongs to the technical fields of fine chemical industry and material science, and in particular relates to a method for liquid crystal microcapsules doped with carbon black. Background technique [0002] Cholesteric liquid crystal is a temperature-responsive reversible color-changing material, which has the advantages of fast response speed, high color-changing sensitivity, rich color-changing layers, and good light resistance stability. Therefore, it is widely used in body temperature precision measurement, liquid crystal display, electronic paper, Liquid crystal lasers, anti-counterfeiting packaging, smart textiles and other fields. In order to stabilize and protect cholesteric liquid crystals, they are usually microencapsulated. [0003] Cholesteric liquid crystal has no chromophoric group, it has a helical structure in the spatial structure, and the liquid crystal structure obtained by combining nematic liquid crystal and chiral ad...

Claims

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Application Information

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IPC IPC(8): B01J13/02C09K19/50
CPCB01J13/02C09K19/50
Inventor 付少海张丽平关玉李敏王春霞
Owner JIANGNAN UNIV
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