Polysiloxane microsphere with core-shell structure and preparation method thereof

A technology of polysiloxane and core-shell structure, which is applied in the field of polysiloxane microspheres with core-shell structure and its preparation, and can solve the problems of poor diffusion effect and the like

Active Publication Date: 2014-07-02
ETERNAL SPECIALTY MATERIALS ZHUHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, most of the current siloxane polymers have a uniform structure, that is, the refractive index inside the particle is consistent, which makes the diffusion effect through the center of the particle poor.

Method used

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

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preparation example Construction

[0055] Preparation method of polysiloxane microspheres with core-shell structure

[0056] The polysiloxane microspheres with a core-shell structure of the present invention can be prepared according to conventional methods in the art, and can also be prepared according to the following method, the method comprising steps:

[0057] i) Firstly, the first-stage polymerization reaction is carried out to form the core of polysiloxane microspheres. At a certain temperature (such as 40-80°C or 50-70°C), in 100 parts by weight of alkaline aqueous solution, let 0.1-15 parts by weight (such as 0.1-10 parts by weight) of siloxane monomer (such as a silicon Oxane monomer or a mixture of multiple siloxane monomers) undergoes a polymerization reaction for a period of time (such as 0.5-5 hours or 0.5-2 hours) to obtain a core containing the polysiloxane microspheres. Therefore, the core of polysiloxane microspheres is obtained by polymerizing siloxane monomers in step (i).

[0058] ii) Nex...

Embodiment 1

[0098] Example 1 Preparation of polysiloxane microspheres with a core-shell structure with a core refractive index of 1.43 and a shell refractive index of 1.55

[0099] Take 300g of water, heat it to 65°C, add 14g of methyltrimethoxysilane, add 0.5mol / L NaOH solution under stirring, adjust the pH value to 9.6, and react for 1h to obtain a reaction mixture containing 1.4μm microspheres.

[0100] Under stirring, slowly add a mixed solution of 18.9g of phenyltrimethoxysilane and 8.1g of methyltrimethoxysilane dropwise to the above reaction mixture, react for 2h, filter under reduced pressure, wash with deionized water, and store at 300°C Dry in an oven for 2 hours to obtain polysiloxane microspheres with an average particle size of 2 μm and a core-shell structure. The particle size distribution is shown in figure 2 shown.

[0101] According to the identification of the refractive index, the core refractive index of the polysiloxane microsphere with the core-shell structure is ...

Embodiment 2

[0102] Example 2 Preparation of Polysiloxane Microspheres with Core-Shell Structure with Core Refractive Index of 1.49 and Shell Refractive Index of 1.52

[0103] Take 300g of water, heat it to 80°C, add a mixed solution of 2.7g of phenyltrimethoxysilane and 5.3g of methyltrimethoxysilane, add 0.5mol / L NaOH solution under stirring, adjust the pH value to 10.9, and react 0.5 h, A reaction mixture containing 0.25 μm microspheres was obtained.

[0104] Under stirring, slowly add a mixed solution of 28.5g of phenyltrimethoxysilane and 28.5g of methyltrimethoxysilane to the above reaction mixture dropwise, react for 2h, filter under reduced pressure, wash with deionized water, and directly in 300 °C in an oven for 2 hours to obtain polysiloxane microspheres with a core-shell structure and an average particle size of 0.5 μm.

[0105] It has been identified that the polysiloxane microspheres having a core-shell structure have a core refractive index of 1.49 and a shell refractive in...

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Abstract

The invention relates to a polysiloxane microsphere with a core-shell structure and a preparation method thereof. The polysiloxane microsphere comprises a core, and a shell which wraps the core; the absolute value of the refractive index difference value between the core and the shell is 0.01 to 0.012; and the particle size of the microsphere is 0.1 to 50 microns and accounts for 20 to 70% of the particle size of the polysiloxane microsphere. The polysiloxane microsphere disclosed by the invention can be used as a light diffusant to be applied to LED lighting and LCD backlight and other diffusion materials; and the polysiloxane microsphere is high in light transmittance and also remains good diffusion effect.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and relates to a polysiloxane microsphere with a core-shell structure and a preparation method thereof. Background technique [0002] Polysilsesquioxane is composed of silicon atoms and oxygen atoms alternately, and includes various organic groups (such as methyl, ethyl, phenyl, etc.) connected to silicon atoms, so it is a polymer with a stable skeleton. Polysilsesquioxane microspheres have the characteristics of high hardness, high melting point, wear resistance, smoothness, water repellency, flame retardant, non-toxic, odorless, transparent, glossy, physiologically inert, etc., and are stable in structure and friendly to the environment. Therefore, polysilsesquioxane can be used as an additive for plastics. After being added to plastics, it can have the effects of light diffusion, wear resistance and slip enhancement. In addition, polysilsesquioxane can also be used as a blocking agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/06G02B5/02
Inventor 任慧卿马霆朱元清卓胜池
Owner ETERNAL SPECIALTY MATERIALS ZHUHAI CO LTD
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