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A kind of preparation method of carbon black doped liquid crystal microcapsule

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 achieve the effects of improved brightness, simple operation and environmental friendliness.

Active Publication Date: 2020-07-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of carbon black doped liquid crystal microcapsule
  • A kind of preparation method of carbon black doped liquid crystal microcapsule
  • A kind of preparation method of carbon black doped liquid crystal microcapsule

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix 3g of cholesterol nonanoate and 7g of cholesterol oleyl carbonate and heat it until all is dissolved and become transparent. After stirring at this temperature for 2 hours, the temperature is lowered until the mixed liquid crystal appears color or turbid, and then the temperature is raised to just right Transparent, stirring at constant temperature for 4 hours, adding 0.02 g of carbon black modified with γ-aminopropyltriethoxysilane to it, and stirring at 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 dropwise to the gum arabic aqueous solution at the same temperature under mechanical stirring, emulsify at high speed to prepare a liquid crystal dispersion, and then slowly drop the gelatin aqueous solution to obtain a liquid crystal reaction system , The liquid crystal mixture accounts for 5% of the mass fraction of the liquid crystal reaction syste...

Embodiment 2

[0033] (1) Mix 1g cholesterol propionate, 1.5g cholesteryl oleate, 2g cholesteryl benzoate, and 0.5g cholesteryl ethyl carbonate and heat it until all is dissolved. After stirring at this temperature for 2 hours, After cooling down to the color or turbidity of the mixed liquid crystal, the temperature is raised to just transparent, and the mixture is stirred at constant temperature for 4 hours, and 0.05 g of carbon black modified with γ-glycidoxypropyltrimethoxysilane is added to it, and stirring is continued for 4 hours. Obtain a liquid crystal mixture;

[0034] (2) Microencapsulation: Keep the liquid crystal mixture at a certain temperature and add dropwise to the gum arabic and dispersant aqueous solution at the same temperature under mechanical stirring, emulsify at a high speed to prepare a liquid crystal dispersion, and then slowly drop the gelatin aqueous solution to obtain Liquid crystal reaction system, in which the liquid crystal mixture accounts for 1% of the mass frac...

Embodiment 3

[0039] (1) Mix 3.8g of CB15 and 6.2g of E7 and heat it until all is dissolved. After stirring for 2h at this temperature, the temperature is lowered until the mixed liquid crystal appears color or turbid, and then the temperature is raised to just transparent. Stir at constant temperature for 4h, and add to it 0.05g of carbon black modified with γ-glycidoxypropyltrimethoxysilane, continue to stir at constant temperature for 4 hours to obtain a liquid crystal mixture;

[0040] (2) Microencapsulation: Keep the liquid crystal mixture at a certain temperature and add dropwise to the gum arabic and dispersant aqueous solution at the same temperature under mechanical stirring, emulsify at a high speed to prepare a liquid crystal dispersion, and then slowly drop the gelatin aqueous solution to obtain Liquid crystal reaction system, where 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 field of fine chemicals and materials science, and specifically relates to a method for carbon black doped liquid crystal microcapsules. Background technique [0002] Cholesteric liquid crystal is a temperature-responsive reversible color material. It has the advantages of fast response speed, high color change sensitivity, rich color change levels, and good light resistance stability. Therefore, it is widely used in precision temperature measurement, liquid crystal display, electronic paper, LCD lasers, anti-counterfeiting packaging, smart textiles and other fields. In order to stabilize and protect the cholesteric liquid crystal, it is usually microencapsulated. [0003] Cholesteric liquid crystal has no chromophore group, it has a spiral structure in the spatial structure. The liquid crystal structure obtained by combining nematic liquid crystal and chiral additives is similar to cholesteric liquid crystal, and it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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