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Liquid crystal microcapsule and preparation method thereof

A technology of microcapsules and liquid crystals, applied in the field of liquid crystal microcapsules and its preparation, can solve the problems of strong toxicity of raw materials and unfavorable large-scale production, etc., and achieve the effects of improving compatibility, long storage time of liquid crystals, and good compatibility

Inactive Publication Date: 2015-05-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The liquid crystal microcapsules prepared by Li Kexuan et al. using isophorone diisocyanate (IPDI) as the raw material and the interfacial polymerization method are not conducive to large-scale production due to the strong toxicity of the raw material (Liquid Crystal and Display 2012;27:583)

Method used

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  • Liquid crystal microcapsule and preparation method thereof
  • Liquid crystal microcapsule and preparation method thereof
  • Liquid crystal microcapsule and preparation method thereof

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preparation example Construction

[0036] According to one aspect of the present invention, a kind of preparation method of liquid crystal microcapsule is provided, comprises the steps:

[0037] a) adding an emulsifier to water to obtain a dispersion, using the dispersion as the water phase;

[0038] b) uniformly mixing the liquid crystal, monoolefin monomer, polyolefin crosslinking agent and initiator to obtain a mixture, which is used as the oil phase;

[0039] c) mixing the water phase and the oil phase to obtain an oil-in-water emulsion through emulsification;

[0040] d) forming liquid crystal microcapsules with a core-shell structure by emulsion polymerization of the emulsion; and

[0041] e) centrifuging and spray drying the liquid crystal microcapsules to obtain a dry powder of the liquid crystal microcapsules.

[0042]Wherein, the amount of the olefinic monomer is 20-80 parts by weight based on 100 parts by weight of the liquid crystal; the amount of the polyolefin crosslinking agent is 5-80 parts by...

Embodiment 1

[0062] In this example, sodium salt hydrolyzate of alternating copolymer of styrene and maleic anhydride (purchased from Sartomer) was used as an emulsifier.

[0063] 10g of aqueous solution of 10wt% styrene-maleic anhydride alternating copolymer sodium salt was added to 77g of water, and the pH value was adjusted to 4.5 with hydrochloric acid, and this solution was used as the water phase;

[0064] Mix 10g of liquid crystal, 2g of styrene, 1g of divinylbenzene, and 0.06g of azobisisobutyronitrile as an initiator, heat up to 60°C, stir to make them evenly mixed, and use it as an oil phase;

[0065] Mix the above-mentioned water phase and oil phase, heat up to 70°C, and use a high-speed mixer to shear and emulsify for 2 minutes at a speed of 12,000 rpm to obtain an oil-in-water emulsion;

[0066] The above-mentioned oil-in-water emulsion was transferred to a preheated reaction kettle, and an inert gas-nitrogen was introduced, mechanically stirred at 200 rpm, and emulsion polyme...

Embodiment 2

[0071] In this example, sodium di-isooctyl sulfonate (purchased from Alfa Aesar) was used as an emulsifier.

[0072] Add 0.4 g of sodium dioctyl sulfonate to 82 g of water, and this solution is used as the water phase;

[0073] Mix 10g of liquid crystal, 2g of styrene, 1g of divinylbenzene, and 0.06g of azobisisovaleric acid as an initiator, and stir to make them evenly mixed as an oil phase;

[0074] Use a microporous membrane with an average pore size of 100nm for membrane emulsification to obtain an oil-in-water emulsion;

[0075] The above-mentioned oil-in-water emulsion was transferred to a preheated reaction kettle, and an inert gas-nitrogen was introduced, mechanically stirred at 200 rpm, and emulsion polymerization was carried out at 70°C for about 8 hours.

[0076] As the polymerization reaction proceeds, the monomers polymerize inside the liquid crystal, and migrate to the interface between the liquid crystal and water under the action of phase separation, thereby f...

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Abstract

The invention provides a liquid crystal microcapsule and a preparation method thereof. The liquid crystal microcapsule preparation method comprises the following steps: 1, adding an emulsifier to water in order to obtain a dispersion used as a water phase; 2, uniformly mixing liquid crystal with a monoolefin monomer, a polyene cross-linking agent and an initiator to obtain a mixture used as an oil phase; 3, mixing the water phase with the oil phase, and emulsifying to obtain an oil-in-water emulsion; 4, polymerizing the emulsion to form the liquid crystal microcapsule with a core-shell structure; and 5, centrifuging the liquid crystal microcapsule, and carrying out spray drying to obtain liquid crystal microcapsule dry powder. The liquid crystal microcapsule prepared through the method has the advantages of uniform dimension, high cladding rate, short production period, simple process, no pollution to the liquid crystal, improved fusion with a microcapsule cladding material, long liquid crystal storage time, and improvement of the water resistance and the pollution resistance of the liquid crystal. The invention also provides the liquid crystal microcapsule with the core-shell structure prepared through the preparation method.

Description

technical field [0001] The invention relates to a liquid crystal microcapsule and a preparation method thereof. Background technique [0002] Liquid crystal is a state of matter between the liquid state and the crystalline state. It not only has some properties of liquid and crystal, such as fluidity, anisotropy, etc., but also has special physical, chemical and photoelectric properties, so it has become today's Research hotspot. In recent years, the research has proposed the concept of Polymer Dispersed Liquid Crystal (PDLC), that is, liquid crystal is dispersed in the organic solid polymer matrix in the form of droplets, because the optical axis of the small droplets composed of liquid crystal molecules is in a free orientation , its refractive index does not match that of the matrix, and when light passes through the matrix, it is strongly scattered by the droplets and presents an opaque opalescent state or a translucent state. Applying an electric field can adjust the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
CPCB01J13/025B01J13/14
Inventor 赵华杨振忠梁福鑫张成亮
Owner INST OF CHEM CHINESE ACAD OF SCI
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