A kind of preparation method of hydrophobic fumed silica

A fumed silica, hydrophobic technology, applied in the direction of silica, silica, preparation with chloride, etc., can solve the problems of difficult infiltration and dispersion, difficult to play a role, limit the application scope of silica, and achieve Not easy to run off, solve poor stability, good load fastness

Active Publication Date: 2019-08-06
浙江富士特硅材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the surface of silica is hydrophilic and oleophobic, it is difficult to infiltrate and disperse in organic media, and it is difficult to play its role when it is directly filled into the material, which limits the application range of silica

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of hydrophobic fumed silica, characterized in that it comprises the following steps:

[0041] 1) Synthesis of silane: Synthesis of silane SiHCl by conventional method 3 、SiCl 4 .

[0042] 2) Fumed silica synthesis: SiHCl 3 、SiCl 4 As the main raw material, fumed silica is synthesized by conventional methods.

[0043] 3) Hydrophobic modification:

[0044] Send the fumed silica into the hydrophobic treatment device, feed nitrogen to control the oxygen concentration below 1%, pump in water and dimethyldichlorosilane, so that the quality of dimethyldichlorosilane is 10wt% of the fumed silica , hydrophobically modified at 400° C. for 4 hours to obtain hydrophobically modified fumed silica.

[0045] 4) Post-treatment: Deacidify the hydrophobically modified fumed silica with steam, and then perform electric drying and cooling after deacidification; finally use a volumetric machine to adjust the bulk density; and pack the qualified products. The spec...

Embodiment 2

[0048] A preparation method of hydrophobic fumed silica, characterized in that it comprises the following steps:

[0049] 1) Silane synthesis:

[0050] Metal silicon and HCl are added to the reactor for reaction, and hydrogen gas is introduced during the reaction. After the reaction, the gas in the reactor is washed with water through a filter to remove unreacted metal silicon. After dust removal, the gas passes through a heat exchanger. After cooling and separation, it is divided into three parts: by-product hydrogen, intermediate SiHCl 3 、SiCl 4 And solid gas separation waste gas.

[0051] Wherein, the by-product hydrogen is reused for silane synthesis and subsequent fumed silica synthesis respectively; the intermediate SiHCl 3 、SiCl 4 After separation by distillation, they are sent to the storage area for temporary storage.

[0052] Solid-gas separation waste gas produced by cooling separation, uncondensed waste gas produced by distillation separation, SiHCl 3 、SiCl ...

Embodiment 3

[0080] A preparation method of hydrophobic fumed silica, characterized in that it comprises the following steps:

[0081] 1) Silane synthesis:

[0082] Metal silicon and HCl are added to the reactor for reaction, and hydrogen gas is introduced during the reaction. After the reaction, the gas in the reactor is washed with water through a filter to remove unreacted metal silicon. After dust removal, the gas passes through a heat exchanger. After cooling and separation, it is divided into three parts: by-product hydrogen, intermediate SiHCl 3 、SiCl 4 And solid gas separation waste gas.

[0083] Wherein, the by-product hydrogen is reused for silane synthesis and subsequent fumed silica synthesis respectively; the intermediate SiHCl 3 、SiCl 4 After separation by distillation, they are sent to the storage area for temporary storage.

[0084] Solid-gas separation waste gas produced by cooling separation, uncondensed waste gas produced by distillation separation, SiHCl 3 、SiCl ...

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Abstract

The invention relates to the field of silicon dioxide preparation, and discloses a hydrophobic fumed silica preparation method, which comprises the following steps: 1, silane synthesis; 2, fumed silica synthesis; 3, hydrophobic modification, wherein fumed silica is sent into a hydrophobic treatment device, nitrogen is introduced to control oxygen concentration to be below 1%, water and dimethyl dichlorosilane or methyl silicochloroform are pumped, and hydrophobic modification is performed to obtain hydrophobic modified fumed silica; 4, aftertreatment, wherein the hydrophobic modified fumed silica is deacidified through steam and then is electrothermally dried and cooled after being deacidified, a volume machine is used to adjust bulk density, and qualified products are checked out and packaged. The fumed silica prepared through the method has the advantages of having good hydrophobic property, being not prone to generating precipitation and having an excellent antibacterial function. In addition, the method has the advantages of small hazardous substance emission amount in a production process and small environmental pollution.

Description

technical field [0001] The invention relates to the field of silica preparation, in particular to a method for preparing hydrophobic fumed silica. Background technique [0002] Hydrophilic fumed silica (white carbon black) is one of the extremely important high-tech ultra-fine inorganic new materials. Because of its small particle size, it has large specific surface area, strong surface adsorption force, large surface energy and high chemical purity. , good dispersion performance, thermal resistance, electrical resistance and other aspects have specific properties, with its superior stability, reinforcement, thickening and thixotropy, widely used in petrochemical, rubber reinforcing agent, plastic filler, ink Thickeners, advanced daily cosmetic fillers and spraying materials, medicine, environmental protection and other fields. [0003] However, the surface of silica is hydrophilic and oleophobic, it is difficult to infiltrate and disperse in organic media, and it is diffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01B7/03
CPCC01B7/035C01B33/12C01P2006/12
Inventor 方卫民谭军刘国晶杨晓义赵艳艳刘晓磊汪菊梅徐慧芬范建平
Owner 浙江富士特硅材料有限公司
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