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Preparation method for high-purity spherical silica micropowder

The technology of spherical silica and spherical silicon micropowder is applied in the field of chemistry, which can solve the problems of complex synthesis process of high-purity silica sol, high energy consumption of flame furnace and high cost of outsourcing, and achieves low equipment cost, high purity and fluidity. Good results

Inactive Publication Date: 2017-09-05
SUZHOU NANODISPERSIONS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method undergoes secondary spheroidization, the process is complicated, the energy consumption of spray drying and flame furnace is high, and the cost is high. If the preparation of high-purity silica powder needs to use high-purity silica sol as the silicon source, the synthesis process of high-purity silica sol is complicated, and the cost of outsourcing very high

Method used

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  • Preparation method for high-purity spherical silica micropowder
  • Preparation method for high-purity spherical silica micropowder
  • Preparation method for high-purity spherical silica micropowder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Mix the purified 100g tetramethoxysilane (TMOS), 15g pure water and a small amount of acetic acid evenly, obtain the organosilicon polymer after hydrolysis and condensation, pass 10% aqueous ammonia solution and the organosilicon polymer through the spray tower Two sets of two-fluid nozzles are used for spray atomization, the hydraulic pressure is 0.4Mpa and the air pressure is 0.6Mpa when the organosilicon polymer is atomized. The atomized silicone spherical droplets react with ammonia water to solidify and fall into the ammonia water (concentration 5%) aqueous solution at the bottom of the spray tower. After 4 hours, the silicon micropowder was separated from the solid and liquid by vacuum filtration, and the obtained filter cake was dried in an oven at 80°C for 6h, and then the powder was calcined in a high-temperature furnace at 1000°C for 1 hour to obtain high-purity spherical silica powder.

[0032] The high-purity spherical silicon micropowder prepared by the abo...

Embodiment 2

[0037] Mix the purified 100g tetraethoxysilane (TEOS), 10g pure water and a small amount of hydrochloric acid evenly, obtain the organosilicon polymer after hydrolysis and condensation, and mix 15% tetramethylammonium hydroxide aqueous solution and organic The silicone polymer is sprayed and atomized through two sets of two-fluid nozzles at the same time. The hydraulic pressure of the silicone polymer atomization is 0.5Mpa, and the air pressure is 0.4Mpa. The atomized organosilicon spherical droplet reacts with the alkaline aqueous solution and then solidifies, and falls in the tetramethylammonium hydroxide (concentration 10%) aqueous solution at the bottom of the spray tower, while the alkaline aqueous solution is self-circulated with a water pump, and then Spherical silicon micropowder is aged in tetramethylammonium hydroxide aqueous solution for 10 hours, and the solid-liquid separation of silicon micropowder is carried out by centrifugation. The obtained filter cake is drie...

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Abstract

The invention discloses a preparation method for high-purity spherical silica micropowder. The preparation method comprises the following steps: subjecting purified organosilicon to hydrolysis and condensation so as to obtain an organosilicon polymer; then reacting the organosilicon polymer with an alkaline aqueous solution and carrying out in-situ curing so as to form spherical silicon oxide particles; subjecting the spherical silicon oxide particles to ageing and then carrying out separation so as to obtain spherical silica micropowder; and carrying out high-temperature calcining so as to obtain high-purity spherical silica micropowder. According to the invention, high-purity organosilicon is used as a silicon source and no other additive or adjuvant is needed, so secondary pollution of silica micropowder is reduced; and the prepared high-purity spherical silica micropowder is high in purity and almost free of alpha ray pollution of radioactive elements, and the content of each metal impurity in the silica micropowder is 1 ppm or below.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a preparation method of a compound, in particular to a preparation method of high-purity spherical silica micropowder. Background technique [0002] Spherical microsilica powder is an important functional material, which has excellent properties such as low dielectric, high heat resistance, high temperature resistance, high filling content, low expansion, low stress, low density, low friction coefficient and good chemical stability. Spherical microsilica powder is mainly used in copper clad laminates in large-scale integrated circuit packages and fillers in epoxy molding compounds. It is also used in high-tech fields such as aerospace, optical fibers, special ceramics, fine chemicals, and daily cosmetics. [0003] With the development of large-scale integrated circuits, the requirements for plastic packaging materials are becoming more and more stringent, not only requiring ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2004/03C01P2004/32C01P2004/52C01P2004/61C01P2006/80
Inventor 刘亚王宇湖
Owner SUZHOU NANODISPERSIONS
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