Preparation method for nano silicon dioxide

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 ...

AI Technical Summary

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 complicated in the past, and continuous production was not possible, and the production speed was slow. Therefore, a nano-silica microsphere was designed. The preparation method is necessary

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