Method for producing silica aerogel

Abstract

The invention relates a preparation method for nanoporous aerogel materials; particularly, the manufacturing process comprises a plurality of steps: firstly, preparing sol according to a certain ratio; filling the sol into a closed die, heating up quickly and the sol is reacted into gel; then, continuing to heat up and the solvent is gasified to produce certain static pressure; when the critical temperature and critical pressure of the drying medium are reached, keeping the gel for a while, deflating and lowering the pressure; finally, decreasing the temperature of the die to room temperatureand demolding; finally aerogel is obtained. One-step molding of sol, gel and aerogel shortens the preparation cycle of aerogel and thus reducing the production cost of the aerogel, which greatly improves the productivity, reduces the material cost and render possible the wide application of aerogel.

Description

Technical field: The invention relates to the technical field of manufacturing nanoporous airgel materials, in particular to a method for preparing airgel. Background technique: Airgel is a porous amorphous solid material composed of nano-scale particles or polymer molecules. It is currently the lightest condensed material in synthetic materials. The typical size of its pores is 1-100nm, and the porosity is as high as 80. %~99.8%, the specific surface area is as high as 200~1000m 2 / g, density change range is 3~500kg / m 3 , is a new type of material with many special properties and broad application prospects. Especially after entering the 1980s, the research on aerogels was extremely active, and was listed as one of the top ten popular science and technologies in the 1990s by the American "Science" magazine. Airgel is usually prepared by sol-gel technology and supercritical drying technology, wherein supercritical drying is carried out under the critical temperature and ...

AI Technical Summary

Problems solved by technology

It can be seen that the preparation of airgel by non-supercritical drying is more cumbersome and the preparation cycle is longer, which is not conducive to the realization of industrial production

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