Preparation method for nano silicon dioxide

A nano-silica and aqueous solution technology, applied in the direction of silica, silicon oxide, chemical instruments and methods, etc., can solve the problems of complex preparation steps, non-continuous production, slow production speed, etc., and achieve fast preparation speed and adaptability Strong performance and good work stability

Inactive Publication Date: 2017-01-18
浙江晶雅玻璃科技有限公司
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Problems solved by technology

[0004] Although the preparation method disclosed in this patent can realize the large-scale preparation of nano-silica microspheres, the steps of the preparation method were complica

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  • Preparation method for nano silicon dioxide
  • Preparation method for nano silicon dioxide
  • Preparation method for nano silicon dioxide

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[0057] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0058] The preparation method of this nano silicon dioxide comprises the following steps:

[0059] a. Preparation: prepare a 7.5% NaCl aqueous solution and a 45% NaCl solution with high-purity water 2 SiO 3 Aqueous solution and concentration are 13.5% dilute hydrochloric acid solution; In the present embodiment, high-purity water adopts the existing product that can buy on the market;

[0060] B, reaction: the NaCl aqueous solution, NaCl prepared in step a 2 SiO 3 The aqueous solution and dilute hydrochloric acid solution are poured into the reactor for reaction, and the reaction time is 10-40min. In this embodiment, the reaction time is 25min;

[0061] c. Aging: introducing the reacted solution in the reactor into the...

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Abstract

The invention provides a preparation method for nano silicon dioxide, and is used for solving the technical problems that a conventional preparation method is complicated in past steps, cannot be used for continuous production and has slow production speed and the like. The preparation method of the nano silicon dioxide comprises the following steps: a, preparation: preparing an NaCl aqueous solution with the concentration of 7.5%, an Na2SiO3 aqueous solution with the concentration of 45% and a diluted hydrochloric acid solution with the concentration of 13.5% by high-purity water; b, reaction: pouring the NaCl aqueous solution, the Na2SiO3 aqueous solution and the diluted hydrochloric acid solution prepared in the step a into a reaction kettle, and carrying out a reaction; c, aging: introducing the solution obtained after the reaction in the reaction kettle into a storage tank, and aging, to form a sol; d, filter pressing and washing: transporting the aged sol to a filter press, and carrying out filter pressing; e, drying: drying a wet filter cake obtained in the step d through a drying oven; and f, pulverization: pulverizing the dried powder particles by an airflow pulverization system, to obtain the nano silicon dioxide. The preparation method has the advantage of fast preparation speed.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of nano silicon dioxide. Background technique [0002] Nanoscale silica is an inorganic chemical material, commonly known as white carbon black. Because it is ultra-fine and nanoscale, with a size range of 1 to 100 nm, it has many unique properties, such as optical properties against ultraviolet rays, and can improve the anti-aging, strength and chemical resistance of other materials, and has a wide range of uses. [0003] After searching, for example, Chinese patent literature discloses a preparation method of nano-silica microspheres [application number: 201410015493.6; publication number: CN 104326478A]. The preparation method of this nano-silica microsphere is characterized in that it includes the following steps: uniformly mixing the organic solvent and the alkaline solution to form a first mixed solution; adding a polymer dispersant to the first mixed solution ...

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Application Information

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IPC IPC(8): C01B33/18B82Y30/00B02C19/00
CPCB02C19/0043B82Y30/00C01B33/18C01B33/186C01P2004/64
Inventor 林晓丽陈晔
Owner 浙江晶雅玻璃科技有限公司
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