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Composite microsphere with core-shell structure and preparation method thereof

A technology of composite microspheres and core-shell structure, which is applied in the field of composite microspheres with core-shell structure and its preparation, can solve the problems of poor compatibility of matrix materials, little deviation of refractive index, influence of flame retardancy of products, etc. Achieve the effect of diverse performance, adjustable performance performance, and improved microsphere performance

Inactive Publication Date: 2020-11-20
ETERNAL SPECIALTY MATERIALS ZHUHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to their opacity, inorganic particles have low light transmittance when applied to diffusion materials and poor compatibility with matrix materials.
The organic acrylic polymer has an impact on the flame retardancy of the product due to its low melting point.
Low thermal conductivity, poor flame retardancy, etc.
Silicone-based light-diffusing agents are the most widely used light-diffusing materials at present. However, most of the current silicone-based light-diffusing agents are microspheres with smooth surfaces. poor diffusion

Method used

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  • Composite microsphere with core-shell structure and preparation method thereof
  • Composite microsphere with core-shell structure and preparation method thereof
  • Composite microsphere with core-shell structure and preparation method thereof

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preparation example Construction

[0074] In the second aspect of the present invention, a method for preparing composite microspheres with a core-shell structure and a radial fibrous mesoporous shell structure is provided, comprising the steps of:

[0075]i) adding an organic silicon source or a mixed silicon source of an organic silicon source and an inorganic silicon source to an alkaline aqueous solution for the first polymerization reaction to obtain a first reaction mixture containing core microspheres, and filtering or centrifuging the reaction mixture Separation to obtain the core microspheres;

[0076] ii) Disperse the above-mentioned core microspheres in water, stir to form a uniform dispersion; add the above-mentioned dispersion to an aqueous solution containing an emulsifier and a catalyst, ultrasonically disperse, and then add an inorganic silicon source or an inorganic silicon source and an organic The mixed silicon source of the silicon source is subjected to a second polymerization reaction, and...

Embodiment 1

[0092] Take 100g of water, heat it to 65°C, add 5g of methyltrimethoxysilane, add 0.5mol / L NaOH solution under stirring, adjust the pH value to 9.5, react for 1h, neutralize with 0.5mol / L sulfuric acid solution, filter , to obtain microspheres (core microspheres) with an average particle size of 1.6 μm, such as figure 1 shown.

[0093] Disperse the above-mentioned core microspheres in water to prepare a dispersion liquid with a mass fraction of 20%. Measure 25 g of this dispersion liquid and add it to a 250 mL three-neck flask containing a mixture of 2.4 g cetyltrimethylammonium p-toluenesulfonate, 0.43 g triethanolamine and 100 g distilled water, and continue ultrasonication for 5 min. The three-neck flask was placed in an oil bath, fixed, and 5 g of tetraethyl orthosilicate was added under mechanical stirring (250 rpm), and the temperature of the system was raised to 70° C. for 16 hours. After the system was cooled to room temperature, 50 g of ethanol was added to the reac...

Embodiment 2

[0095] Take 100g of water, heat it to 65°C, add 1.8g of phenyltrimethoxysilane, 0.35g of methyltrimethoxysilane and 0.5g of methylphenyldimethoxysilane mixture, add 0.5mol / L NaOH solution under stirring , adjust the pH value to 9.2, react for 1 h, neutralize with 0.5 mol / L sulfuric acid solution, and centrifuge at high speed to obtain microspheres (core microspheres) with an average particle size of 1.5 μm. Disperse the core microspheres in water to form a 20% dispersion.

[0096] Take 100 g of distilled water, add 3.5 g of cetyltrimethylammonium bromide, stir, and add 18 g of the above-mentioned core microsphere dispersion. Add 0.6 g of triethanolamine, then add 3.5 g of tetraethyl orthosilicate, raise the temperature to 70° C., and react for 5 hours. Composite microspheres with core-shell structure ( Figure 6 and its partially enlarged view - Figure 7 ), the average particle size of the core microsphere is 1.5 microns, and the thickness of the fibrous mesoporous shell i...

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Abstract

The invention discloses a composite microsphere with a core-shell structure and a preparation method of the composite microsphere. The composite microsphere comprises a core microsphere and a radial fibrous mesoporous shell layer wrapping the core microsphere, the average particle size of the composite microsphere is 0.1-30 [mu]m, the core microsphere is made of polysiloxane polymerized by an organic silicon source or an organic-inorganic hybrid material polymerized by an inorganic silicon source and the organic silicon source, and the shell layer is made of silicon dioxide polymerized by theinorganic silicon source or the organic-inorganic hybrid material polymerized by the inorganic silicon source and the organic silicon source, the preparation method of the composite microsphere is simple, the production period is short, the synthesis process is simple and easy to implement, the core microsphere is synthesized firstly, and then the radial fiber shell layer with mesoporous channelsgrows in situ on the basis of the core microsphere. The composite microsphere has the characteristics of high light scattering efficiency, large specific surface area, high porosity and the like, canbe widely applied to light diffusion materials such as LED illumination and LCD backlight sources, and can also be used in the fields of fillers of coatings, cosmetics, catalysts and water treatment.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to a composite microsphere with a core-shell structure and a preparation method thereof. [0002] technical background [0003] Mesoporous composite materials with core-shell structure have high specific surface area, large pore volume, rich mesoporous structure, and excellent properties of core and shell due to the effective combination of unique core-shell structure and mesoporous materials. It has broad application prospects in light diffusion, cosmetics, coatings, water treatment, catalytic loading, etc. [0004] Compared with microspheres with traditional mesoporous shells, microspheres with radial fibrous mesoporous shells not only have the characteristics of high specific surface area, but also have pores with more hierarchical sizes, which make them have good permeability, large The pore volume improves the loading capacity of guest molecules. Optically,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L83/04C08L83/07C08L83/08C08L83/06
CPCC08J3/128C08J3/12C08J2383/04C08J2383/07C08J2483/04C08J2383/08C08J2383/06C08J2483/08
Inventor 卓胜池花玉芳王宏宇江蒙陈凤
Owner ETERNAL SPECIALTY MATERIALS ZHUHAI CO LTD
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