Method of preparing regular-shaped SiO2 aerogel granules through high-energy 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 high-energy cutting, which comprises the following steps: 1) dissolving organic silane, diluted hydrochloric acid and deionized water in an organic solvent at 0-40 DEG C, mixing the solution uniformly, and carrying out a reaction for 0.1-8 h to obtain silica sol; 2) at 0-40 DEG C, adding alkali with stirring, and carrying out a reaction for 0.01-1 h, and allowing the substances to stand; (3) after gelation, cutting gel to obtain the regular-shaped SiO2 aerogel granules through the high-energy cutting; and (4) drying the aerogel granules. In the invention, through the high-energy cutting, the regular-shaped SiO2 aerogel granules are prepared. The regular-shaped SiO2 aerogel granule is uniform in texture, is high in visible light transmittance, is good in filling property, is convenient to process subsequently and promotes industrialization of SiO2 aerogel greatly.

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 airgel particles by high-energy cutting. Background technique [0002] Airgel, English aerogel. When the gel removes most of the solvent, the liquid content in the gel is much less than the solid content, or the medium filled in the space network structure of the gel is gas, and the appearance is solid, that is, airgel, air condensation Glue usually aggregates nano-scale ultrafine particles to form a nano-porous network structure, and is a light-weight nano-solid material filled with a gaseous dispersion medium in the network pores. Airgel is sometimes called "solid smoke" or "frozen smoke" because of its translucent color and ultra-light weight. [0003] The most common and widely used aerogels are silica aerogels. Silica airgel is a lightweight nanoporous amorphous solid material with excellent thermal insulati...

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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 great waste of raw materials, pushing up product costs; 3, this method can not control the transmittance of visible light, can not adapt to various needs, is not conducive to post-processing; 4, this method The reflux 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. , so the powder pollution is large

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