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A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide

A technology of fumed silica and silica, which is applied in the direction of silica and silica, can solve the problems of silica hydrophobicity instability, complex process, and application limitations, and avoid castor Catalyst failure, simple process, and easy-to-achieve reaction conditions

Active Publication Date: 2020-06-26
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified silicon dioxide prepared by the invention has hydrophobicity, but the long-chain alkyl alcohol is adsorbed on the surface of the silicon dioxide through physical action, the process is complicated, the hydrophobicity of the silicon dioxide is unstable, and the application is limited.

Method used

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  • A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide
  • A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide
  • A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide

Examples

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Embodiment 1

[0043] A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide, comprising the steps of:

[0044]Send the fumed silica into the processing device, replace the air with nitrogen, add vinyl silicone oil (where c=28, d=2), the amount added is 5% of the mass of the fumed silica, mix well, and react at 300°C for 2h , to obtain silicon dioxide containing vinyl on the surface; cooling to 150°C, adding a mixture of low-viscosity methyl silicone oil (viscosity of 10mPa.s at 25°C) and Castel catalyst (Pt mass content is 2000ppm) In the above-mentioned silica treatment device, mix evenly, under the protection of nitrogen, keep warm at 150°C for 2h, the mass content of Pt in the mixture is 100ppm, and the addition amount of the mixture of methyl silicone oil and castor catalyst is 1% of the mass of fumed silica. 1%; then add tetramethyldisiloxane, keep the temperature at 150°C under the protection of nitrogen, after 4 hours of treatment, vacuum off low molecular ...

Embodiment 2

[0046] A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide, comprising the steps of:

[0047] Send the fumed silica into the processing device, replace the air with nitrogen, add vinyl silicone oil (where c=40, d=10), the amount added is 15% of the mass of the fumed silica, mix well, and react at 400°C for 6h , to obtain silicon dioxide containing vinyl on the surface; cooling to 200°C, adding a mixture of low-viscosity methyl silicone oil (viscosity at 25°C is 20mPa. In the above-mentioned silica treatment device, mix evenly, under the protection of nitrogen, keep warm at 200°C for 3h, the mass content of Pt in the mixture is 30ppm, and the addition amount of the mixture of methyl silicone oil and Castor catalyst is 5% of the mass of fumed silica. %; then add tetramethyldisiloxane, the amount of tetramethyldisiloxane added is 10% of the mass of fumed silica, and the temperature is kept at 200°C under the protection of nitrogen. After 4 hours of t...

Embodiment 3

[0049] A method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide, comprising the steps of:

[0050] Send the fumed silica into the processing device, replace the air with nitrogen, add vinyl silicone oil (where c=35, d=3), the amount added is 10% of the mass of the fumed silica, mix well, and react at 400°C for 5h , to obtain silicon dioxide containing vinyl on the surface; cooling to 160°C, adding a mixture of low-viscosity methyl silicone oil (viscosity of 16mPa.s at 25°C) and Castel catalyst (Pt mass content is 2000ppm) In the above silicon dioxide treatment device, mix evenly, under the protection of nitrogen, keep warm at 160°C for 2h, the mass content of Pt in the mixture is 50ppm, and the amount of the mixture of methyl silicone oil and castor catalyst is 3% of the mass of fumed silica. %; then add tetramethyldisiloxane, the amount of tetramethyldisiloxane added is 6% of the mass of fumed silica, and the temperature is kept at 180°C under nitroge...

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Abstract

The invention provides a method for preparing hydrophobic silica by virtue of fumed silica. The method comprises the following steps: performing a reaction between fumed silica and vinyl silicone oilto prepare silicon dioxide containing vinyl; mixing silicon dioxide with a mixture of methyl silicone oil and a Karstedt catalyst; adding tetramethyldisiloxane to react to obtain modified silicon dioxide; and finally, adding alpha-olefin to react, so as to obtain hydrophobic silica. According to the method, the treatment of hydroxy on the surface of fumed silica is relatively thorough; long-chainalkyl is grafted to the surface of fumed silica, so that the grafting rate is high, obtained long-chain alkyl surface-modified silicon dioxide has good hydrophobicity and hydrophobic stability and further has good consistency with organic matters (including materials mainly containing carbon chains).

Description

technical field [0001] The invention relates to a method for preparing hydrophobic silicon dioxide by using fumed silicon dioxide, and belongs to the technical field of nanomaterial preparation. Background technique [0002] Fumed silica is a fine, white, amorphous powder material with small particle size, large specific surface area, and high purity. It is widely used in additives, catalyst carriers, decolorizers, matting agents, rubber reinforcing agents, Plastic fillers, ink thickeners, metal soft polishing agents, insulating fillers, high-grade daily cosmetic fillers and spraying materials, medicine, environmental protection and other fields. [0003] Fumed silica generally uses silicon tetrachloride or methyltrichlorosilane to hydrolyze and polycondense at high temperature in an oxygen-hydrogen flame to form silica particles; since the polycondensation of chlorosilane after hydrolysis is incomplete, there are still many silanol groups remaining. On the surface of silic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2006/90
Inventor 伊港刘海龙张停张俊石科飞耿宁张帅周玲周磊
Owner SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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