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A kind of preparation method of liquid crystal microcapsule and liquid crystal microcapsule

A technology of microcapsules and liquid crystals, applied in the field of composite materials, can solve problems such as poor optical properties of liquid crystal microcapsules, and achieve the effects of easy industrialized production, improved encapsulation rate and coating rate, and high liquid crystal coating rate

Inactive Publication Date: 2019-05-21
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of this application has improved the coverage rate of liquid crystal microcapsules, the optical performance of the obtained liquid crystal microcapsules is not good enough

Method used

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  • A kind of preparation method of liquid crystal microcapsule and liquid crystal microcapsule
  • A kind of preparation method of liquid crystal microcapsule and liquid crystal microcapsule
  • A kind of preparation method of liquid crystal microcapsule and liquid crystal microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] In this embodiment, epoxy resin-polyethylene glycol copolymer is used as emulsifier.

[0083] 1) 2g of 3.3wt% epoxy resin-polyethylene glycol copolymer aqueous solution is added to 48g water, and the pH value is adjusted to 3.5 with hydrochloric acid, and this solution is used as the water phase;

[0084] 2) Mix 1g of liquid crystal, 0.15g of γ-glycidyl etheroxypropyl trimethoxysilane and 1g of E-51, and ultrasonically disperse them to make them evenly mixed as the oil phase;

[0085] 3) Mix the above-mentioned water phase and oil phase, and use an ultrasonic cell disruptor to ultrasonically emulsify for 2 minutes at a power of 200w to obtain an oil-in-water emulsion;

[0086] 4) Transfer the above-mentioned oil-in-water emulsion to a preheated reaction kettle, mechanically stir at 300 rpm, and react at 70°C for about 3 hours. As the polymerization reaction progresses, the silane coupling agent slowly dissolves in the oil-water The interface sol-gel forms the initial s...

Embodiment 2

[0091] In this example, sodium salt hydrolyzate of alternating copolymer of styrene and maleic anhydride (purchased from Sartomer) was used as an emulsifier.

[0092] 1) Add 3 g of sodium salt of 10 wt % styrene-maleic anhydride alternating copolymer to 47 g of water, adjust the pH value to 9 with ammonia water, and use this solution as the water phase;

[0093] 2) Mix 2g of liquid crystal, 0.25g of γ-glycidyl etheroxypropyltrimethoxysilane and 1.5g of E-51, and ultrasonically disperse them to make them evenly mixed as the oil phase;

[0094] 3) the above-mentioned water phase and oil phase are mixed, and a microporous membrane with an average pore diameter of 55 nm is used for membrane emulsification to obtain an oil-in-water emulsion;

[0095] 4) Transfer the above-mentioned oil-in-water emulsion to a preheated reaction kettle, introduce inert gas-nitrogen, mechanically stir at 300 rpm, and react at 70°C for about 3 hours. As the polymerization reaction proceeds, The silane...

Embodiment 3

[0101] In this embodiment, epoxy resin-polyethylene glycol copolymer is used as emulsifier.

[0102] 1) 2.5 g of 3.3 wt % epoxy resin-polyethylene glycol copolymer aqueous solution is added to 47.5 g of water, and the pH value is adjusted to 4.7 with hydrochloric acid, and this solution is used as the water phase;

[0103] 2) Mix 1g of liquid crystal, 0.1g of γ-aminopropyltriethoxysilane and 0.3g of E-51, and ultrasonically disperse them to make them evenly mixed as the oil phase;

[0104]3) Mix the above-mentioned water phase and oil phase, and use an ultrasonic cell disruptor to ultrasonically emulsify for 2 minutes at a power of 300w to obtain an oil-in-water emulsion;

[0105] 4) Transfer the above-mentioned oil-in-water emulsion to a preheated reaction kettle, introduce inert gas-nitrogen, mechanically stir at 300 rpm, and react at 70°C for about 6 hours. As the polymerization reaction proceeds, The silane coupling agent slowly forms the initial shell at the oil-water in...

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Abstract

The invention belongs to the field of composite materials, and relates to a preparation method of a liquid crystal microcapsule and a liquid crystal microcapsule. The preparation method comprises a preparation process of an oil-in-water emulsion, wherein a mixture as an oil phase contains a liquid crystal, an epoxy resin monomer, a silane coupling agent and an oil-soluble epoxy resin curing agent. The liquid crystal microcapsules obtained by the method have the advantages of good light transmittance, high mechanical strength, chemical resistance, simplicity in process, convenience in control on structure and easiness in industrialization.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a preparation method of a liquid crystal microcapsule and the liquid crystal microcapsule. Background technique [0002] Liquid crystal is a state of matter between the liquid state and the crystalline state. In addition to some properties of both liquid and crystal, such as fluidity and anisotropy, it also has special physical, chemical and photoelectric properties, so it has become today's Research hotspot. Polymer dispersed liquid crystals have broad application prospects in high-tech fields such as holographic storage, display, gradient color grating, and modulated laser. [0003] Microcapsule refers to the use of natural or synthetic polymer materials to wrap solid, liquid or gaseous substances into tiny capsules with a diameter of 5-300 μm. As early as the 1930s, the American Atlantic Fisheries Company applied for a patent for preparing gelatin microcapsules containing co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14
CPCB01J13/14
Inventor 杨振忠江文红解孝林彭海炎廖永贵梁福鑫
Owner INST OF CHEM CHINESE ACAD OF SCI
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