What are the methods for preparing high alumina aerogel composites based on aluminum isopropoxide?

Yangzhou Zhongtianli New Materials Co., Ltd. is a national high-tech enterprise specializing in the research and development, production and sales of high-purity and nano materials. The main products are aluminum isopropoxide, aluminum sec butanol, 99.999% (5N) high-purity aluminum oxide and micro nano Rice noodles, and have achieved outstanding results in many fields. Today, Zhongtian Li's editor will talk to you about the methods of preparing high aluminum aerogel composites from aluminum isopropoxide?

There are several methods to prepare high aluminum aerogel composites based on aluminum isopropoxide:

1. Secondary butanol aluminum is an oily liquid, which is mainly used as active catalyst and carrier in industry. It has good alcohol solubility and is very easy to hydrolyze. It is also a common aluminum source for small batch preparation of aluminum oxide aerogel in the laboratory. Because it is very easy to hydrolyze and deteriorate in the air, the transport and storage conditions are harsh, especially the high price, which limits its wide application. Aluminum isopropoxide is a white powder that is easily hygroscopic and slightly soluble in ethanol. Its price is about 1/3 of that of aluminum sec-butanol. It is easy to store and transport, making it more suitable for large-scale applications.

2. Using organic aluminum source to realize the preparation of alumina aerogel. According to the publicly reported method of zhuanli, it was found that using secondary butanol aluminum as the aluminum source is easy to obtain transparent and stable aluminum sol, while isopropanol aluminum as the aluminum source forms an milky white turbid liquid, making it difficult to obtain a transparent sol. The stable and transparent sol is a key step in the synthesis of high-quality alumina aerogels. Therefore, the efficient preparation of stable and transparent aluminum sol based on aluminum isopropoxide as an aluminum source is one of the urgent issues to be solved.

3. In addition, the inherent low strength, high brittleness and difficulty in forming of al_2o_3 aerogel materials limit the application of al_2o_3 aerogel in industry. Participating aluminum sol as a reactant in the hydrolysis reaction of silica sol to prepare silica aluminum composite gas.

4. Preparation method of silicon aluminum composite aerogel. It is an effective way to prepare high-performance aerogels by introducing silicon into al_2o_3 aerogels, which can improve the strength of aerogels in varying degrees, inhibit the high-temperature phase transformation and sintering of al_2o_3 aerogels, and improve the high-temperature comprehensive properties of al_2o_3 aerogels.

Extended Reading

Overview of methods for preparing aluminum sol based on aluminum isopropoxide

Alumina aerogel was successfully prepared by Professor Yoldas of the United States through organometallic aluminum alkoxide in the early stage. Aluminum oxide can withstand 950 ℃ without sintering, and after heat treatment at 1050 ℃ for 4 hours, its linear shrinkage does not exceed 2%. Due to its excellent temperature resistance and insulation performance, it has attracted people's attention, and its preparation methods have also been continuously innovated and improved. The aluminum sources for preparing alumina aerogels include inorganic aluminum sources represented by aluminum nitrate and aluminum chloride, and organic aluminum sources represented by aluminum isopropoxide and aluminum sec butanol. Among them, the aerogels prepared with organic aluminum salts have narrower pore diameters, more uniform pore distribution, more complete polycrystalline boehmite structure, and better temperature resistance.

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