In-situ composite silicon-based multibasic oxide oxide aerogel material and preparation method thereof

Abstract

The invention relates to an in-situ composite silicon-based multibasic oxide oxide aerogel material and its preparation method, especially to a multibasic oxide oxide aerogel material which is prepared by the following steps: using soluble glass as a silicon source, mixing metallic oxide corresponding water-soluble metal salt, adding acid or alkali to adjust pH value of the system so as to form multibasic oxide sol; mixing the multibasic oxide sol with a water-soluble organic solvent, filtering to remove produced precipitate so as to obtain salt-free multibasic oxide sol, carrying out a sol-gel method, aging, modifying and drying. By a mature silica aerogel technology, the multibasic oxide oxide aerogel material is prepared by in-situ polymerization of other oxide components which are not easy to separately prepare aerogel. In addition, the multibasic oxide oxide aerogel material has excellent properties, such as high temperature stability, high activity, magnetic property and the like, none of which are present in single-component silica aerogel. The product is widely applied in fields of high temperature insulation, sound insulation, catalysts, catalytic carriers, battery electrodes, electromagnetism, resistance, gas sensitivity, humidity sensitivity, luminescent materials and the like.

Description

technical field [0001] The invention relates to an airgel material and a preparation method thereof, in particular to an in-situ composite preparation of a silicon-based multi-oxide airgel material and a preparation method thereof. Background technique [0002] Airgel is a new type of nano-insulation material. It was invented by American Kistler.S. in 1931. It is also called "blue smoke" and "frozen smoke". One of the top 10 popular science and technology since then is a military-civilian dual-use technology with great application value. [0003] At present, silica airgel has initially achieved mass production, and other types of oxide airgel, such as alumina airgel, zirconia airgel, titanium oxide airgel, etc. are still at the experimental level, vanadium oxide airgel The preparation of glue and yttrium oxide airgel is even more difficult, and the distance from large-scale industrial production is also farther away. [0004] Patent CN200810033022.2 discloses a preparatio...

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Problems solved by technology

[0012] The above patents all involve the in-situ composite preparation of binary or multi-element airgel materials using silicon airgel technology. The disclosure and implementation of the above-mentioned patents will facilitate the development of high-quality multi-element airgel materials, but there are still obvious problems. One is that the silicon sources used in the prior art are basically organic silicon esters such as tetraethyl orthosilicate, and the price of organic silicon esters is relatively high, which restricts the production cost of airgel; the other is that the reaction environment of the prior art is basically alcohol-containing system, because most metal salts are insoluble in ethanol, and directly produce precipitation, which severely restricts the available types of metal salts and the effect of addition, and it is difficult to achieve ideal in-situ recombination; third, the existing technology is mainly aimed at silicon oxide and Binary or ternary composites of titanium oxide, aluminum oxide, and zirconium oxide involve fewer types of metal oxides, and cannot become a general multi-element airgel preparation method; fourth, the existing technology is to make the added metal Oxide gels generally use propylene oxide, a flammable and explosive toxic substance that is irritating to mucous membranes and skin, can damage the cornea and conjunctiva, cause respiratory pain, skin burns and swelling, and even tissue necrosis