Method of preparing regular-shaped SiO2 aerogel granules through mechanical cutting

Abstract

The invention relates to nano inorganic non-metal materials and particularly relates to a method of preparing regular-shaped SiO2 aerogel granules through mechanical cutting, which comprises the following steps: (1) dissolving organic silane, diluted hydrochloric acid and deionized water in an organic solvent, wherein the volume ratio of the organic silane, the diluted hydrochloric acid, the deionized water to the organic solvent is 1:0.0025-0.5:0.05-5:0.5-8, mixing the mixture uniformly, performing a reaction for 0.1-8 h to obtain silica sol; (2) adding an alkali at 0-40 DEG C and performing a reaction for 0.01-1 h, and allowing the mixture to stand; (3) performing gelation and cutting the gel into regular-shaped gel granules through mechanical cutting; and (4) drying the gel granules to obtain the regular-shaped SiO2 aerogel granules.

Description

Technical field [0001] The invention relates to the field of nano inorganic non-metallic materials, in particular to a method for preparing regular-shaped silica aerogel particles by mechanical cutting. Background technique [0002] Aerogel, English aerogel. When most of the solvent is removed from the gel, the liquid content in the gel is much less than the solid content, or the medium in the spatial network structure of the gel is gas, and the appearance is solid, that is, aerogel, which is aerogel. Glue is usually a lightweight nanometer solid material in which nanometer-scale ultrafine particles aggregate with each other to form a nanoporous network structure, and the network pores are filled with a gaseous dispersion medium. Aerogel is sometimes called "solid smoke" or "frozen smoke" because of its translucent color and ultra-light weight. [0003] The most common and widely used aerogel is silica aerogel. Silica aerogel is a lightweight nanoporous amorphous solid material ...

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Problems solved by technology

However, this method has the following problems: 1, the silica airgel particles obtained by this method are all irregular particles, the filling property is not good, and the texture is not uniform enough; 2, the target size particle yield of this method Low, the yield is lower than 50%, resulting in a great waste of raw materials, pushing up the product cost; 3, this method can not control the light transmittance, can not adapt to various needs, is not conducive to post-processing; 4, the method backflow The time is long and the production efficiency is low, so industrialization is a problem; 5. This method adopts the traditional method of drying and then crushing. The size distribution of crushing is too wide and the size is different, which affects the yield of finished products, and a large amount of powder is produced during the crushing process. Therefore, the powder pollution is large

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