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Preparation method of silica airgel

A technology of silica and airgel, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve the effect of improving the replacement effect

Active Publication Date: 2022-01-07
赵国升
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Problems solved by technology

[0004] In the above-mentioned previous proposals, there are different airgel preparation methods, but they all have to go through two steps of "replacement" and "modification", and the "replacement" may be carried out first, or the "modification" may be carried out first, It may even be a combination of "replacement" and "modification"

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  • Preparation method of silica airgel
  • Preparation method of silica airgel
  • Preparation method of silica airgel

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Embodiment Construction

[0037] The present invention requires a preparation method of silica airgel, please refer to figure 1 Shown, preparation method of the present invention mainly is through following steps:

[0038] (1). The inorganic silicon source is mixed with pure water in a container to form a solution, which is based on sodium silicate (commonly known as water glass) with a solid content of 40 to 50% by mass as the inorganic silicon source, and pure water dilutes the sodium silicate ( Commonly known as water glass), the modulus is 2.53-3.33, and the solid content is 8-20% by weight (8-20wt%).

[0039] (2). Hydrolyze the above solution with a cation exchange resin to obtain a silicic acid solution with a pH of 2-3, especially preferably a pH of 2.4-2.6.

[0040] (3). Add a basic catalyst into the above-mentioned silicic acid solution to obtain a wet gel. The basic catalyst can be ammonium hydroxide (NH 4 OH) or sodium hydroxide (NaOH), preferably a silicic acid solution, adding a 1M alkal...

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Abstract

A preparation method of silica airgel, mainly aimed at the solvent replacement process in the preparation of silica airgel, the operation of adding solvent is carried out in a "continuous circulation filtration method", so that the wet gel can be processed in a relatively short time A large number of alcohol solvents and organic solvents are replaced (washed) continuously, so the time for wet gel solvent replacement can be greatly accelerated (reduced). At the same time, the alcohol solvent or organic solvent passing through the reaction vessel will be filtered. The procedure is to separate the wet gel from water or alcohol solvent, and then the alcohol solvent and organic solvent enter the reaction vessel for solvent replacement. Such rapid and continuous circulation filtration can greatly improve the effect of wet gel solvent replacement.

Description

【Technical field】 [0001] The present invention relates to a preparation method of silica aerogel, especially to a method for preparing silica aerogel in which the process of solvent replacement is carried out by performing the operation of adding solvent in a "continuous circulation filtration method" Preparation method of silica airgel. 【Background technique】 [0002] Aerogels (aerogels) usually refer to a lightweight nano-solid-state material that aggregates nanometer-sized ultra-fine particles to form a nanoporous network structure, and fills the network pores with a gaseous dispersion medium. The preparation methods of different aerogels are different, but the preparation process is similar. Generally, the sol-gel method is used to prepare the wet gel (wet gel), and the wet gel is then subjected to solvent replacement and supercritical drying to obtain the corresponding aerogel. glue. The characteristics of airgel are: (a) high porosity; up to 99.8% (b) nanoscale pores...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/159C01B33/158
CPCC01B33/159C01B33/1585C01P2006/12C01P2006/14C01P2006/16C01P2006/10C01P2006/32
Inventor 谢达华陈怡雯
Owner 赵国升