Preparation method of spherical silica powder

Abstract

The invention discloses a preparation process of spherical silica powder, which comprises the following steps: forming a dispersed phase silicon source from a silicon source through membrane emulsification equipment, pressing the dispersed phase silicon source into deionized water containing an emulsifier under a certain pressure to form a stable emulsion, adding a curing agent into the stable emulsion to form particle slurry, and finally, carrying out solid-liquid separation, drying and calcining on the granular material to obtain the spherical silica powder. The preparation method disclosed by the invention has the characteristics of energy consumption saving, easily available raw materials, simplicity, high efficiency, mild reaction conditions, good repeatability and the like. The prepared spherical silica powder has the advantages that the sphericity rate is up to 98% or above, the spherical particle size distribution is uniform, the spherical particles are not agglomerated, the spherical surface is compact and smooth, the spherical silica powder is good in flowability, high in purity and the like, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of inorganic material science, and in particular relates to a preparation method of spherical silicon micropowder. Background technique [0002] Spherical silica powder refers to the amorphous quartz powder material whose individual particles are spherical and the main component is silicon dioxide. The spherical silicon micropowder produced by our company using a special preparation process has the advantages of extremely high sphericity and spheroidization rate, high purity up to electronic grade, small particle size to submicron or nanometer level, uniform particle distribution, and no agglomeration. Widely used in CCL, EMC, electronic glue, plastic, film, polishing, special ceramics, ink coating and cosmetics and other fields. As a filler, spherical silica powder can greatly improve the rigidity, wear resistance, weather resistance, impact and compression resistance, tensile properties, flame resistance, arc resis...

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Problems solved by technology

[0006] Deflagration method: The submicron-sized spherical silica powder prepared by the VMC method using metal silicon has the characteristics of smooth surface and high amorphous content, but this method is currently monopolized by Japan and the United States, and strict blockade is carried out. Dust deflagration is formed, and there is a big safety hazard in the production process

[0007] Patent CN109455726A proposes to prepare spherical silicon micropowder by flame combustion method. The prepared spherical silicon micropowder has a wide particle size distribution and low sphericity. The particles must be classified to obtain uniformly distributed spherical silicon micropowder. Moreover, the flame has extremely high requirements on the equipment spheroidizing furnace. High, large investment in equipment and other issues

Patent CN107285322A proposes to use plasma process to prepare spherical silicon powder, and improve the process to prepare sub-nano spherical silicon powder. The spherical silicon prepared by plasma process has the advantages of good sphericity, high density and good fluidity, but the cost is high and the equipment High requirements, unable to industrialize mass production

In the patent CN102659123A, microemulsions are used to reverse prepare spherical silicon micropowder, water glass, ammonium salt, organic solvent and surfactant are used as raw materials, and condition parameters such as the ratio of organic solvent, dispersant, surfactant and water glass are controlled. Spherical microsilica powder has better sphericity, but the particle size distribution is wide, the particles are easy to agglomerate, and the surface has pits and other problems.

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