Preparation method of transparent silicon dioxide aerogel

Abstract

The invention relates to aerogel and provides a preparation method of transparent silicon dioxide aerogel, which has the advantages of low cost, simple process, short production period, controllable reacting process and continuous production and adopts secondary modification process and normal-pressure drying steps. The preparation method comprises the following steps: 1) solution preparation and silicon source co-precursor hydrolysis; 2) ion exchange and silicon dioxide hydrogel preparation by using gel; and 3) aging, alcoholizing, modifying and normal-pressure drying of the silicon dioxide gel.

Description

technical field

[0001] The invention relates to an airgel, in particular to a preparation method of a transparent silica airgel which uses industrial water glass as a raw material, adopts a secondary modification method, replaces a rapid solvent, and dries under normal pressure. Background technique

[0002] Silicon dioxide (SiO 2 ) Airgel is a solid phase particle, a new type of porous functional material whose pore size is on the nanometer scale, and the continuous three-dimensional network structure can be controlled and tailored at the nanometer scale. Silica aerogels are sometimes called "solid smoke" or "frozen smoke" because of their translucency and ultra-light weight. Silica airgel has many unique properties, such as high specific surface area, high porosity, high thermal insulation, low density, ultra-low dielectric constant and low refractive index, etc., and its properties can be improved with the control of its structure. Continuous adjustability. The excelle...

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