Method for batch preparation of monodisperse submicrometer silica powder

Abstract

The invention discloses a method for batch preparation of monodisperse submicrometer silica powder. By adopting the method, kilogram-level monodisperse submicrometer silica powder can be further prepared in batches in a one step by formula optimization and self-production of a multifunctional reaction kettle. Compared with the traditional liquid-phase method, the preparation method disclosed by the invention has three main advantages that 1, the procedure is simple; energy is saved and consumption is reduced; and the production cost of the powder is low; 2, the solvent can be used in cycle, and is low-carbon and environment-friendly; and pollution of an organic solvent on air is removed; and 3, the kilogram-level monodisperse submicrometer silica powder or silica concentrated liquor can be prepared in batches, so that storage, transportation and use are facilitated. By adopting the preparation method disclosed by the invention, application development and business development of domestic monodisperse silica are greatly facilitated.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to the industrial batch preparation of silica powder, that is, the dispersion liquid of monodisperse spherical silica particles is firstly prepared through a reaction kettle with a decompression condensation device, and after the reaction is completed, the dispersion liquid is passed through the reaction kettle. The decompression condensing device condenses the liquid, and the condensed liquid is recycled as a raw material for powder preparation, and at the same time, the product silicon powder is formed at the bottom of the reaction kettle. Background technique [0002] Silica powder material has more and more important applications in the fields of catalyst carrier, drug release, rubber reinforcement, building insulation and so on. With the rapid development of my country's economy, the output and demand of silica powder are increasing day by day. Among them, the development of s...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for preparing silica powder include gas phase method, liquid phase method, solid phase method, etc. Among them, the main method for preparing monodisperse silica powder is the liquid phase method. Silicon dispersion, and then go through processes such as filtration and spray drying to obtain monodisperse silica powder. Compared with other methods in the industry, this method has obvious disadvantages: First, there are many steps and time-consuming, and it is not as good as gas-phase In addition, the monodisperse silica dispersion obtained by the liquid phase method has a low concentration, generally between 1% and 2%. At the same time, a large amount of silica powder is lost during the preparation of the powder. volatile solvents, which not only increases energy consumption, but also pollutes the air, which runs counter to the needs of the times when all countries in the world are demanding low-carbon and environmental protection. Finally, the output of silica powder prepared by traditional liquid phase method is relatively low. Low, most of them stay at the level of small and pilot tests at the laboratory level. The output of a single kettle is mostly at the gram level, and it is difficult to reach the kilogram level. As a result, manufacturers can only provide low-concentration monodisperse silica dispersions, which is difficult to provide Powder type monodisperse silica or high concentration silica dispersion

It causes a lot of inconvenience to storage, transportation and use

[0004] Due to the above-mentioned many shortcomings, the traditional liquid phase method for preparing monodisperse silica has greatly hindered the development and application of monodisperse silica, and the preparation of monodisperse silica powder by gas phase method cannot obtain monodisperse silica powder. Therefore, there is an urgent need Develop a novel method for preparing monodisperse silica, which is not only simple, time-saving, energy-saving, and environmentally friendly, but also capable of mass production. It is best to obtain monodisperse silica powder in one step, so as to facilitate storage, transportation, use

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