Micron Spherical Silica Gel Powder for Cosmetics Additive and Column Chromatography
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Development history of water resistant silica gel for air separation

The early water resistant silica gel for air separation is made of finished silica gel or broken silica gel, which is mixed with silica sol for processing. Japan has been industrially manufacturing silica gel since 1950. It is a large country of silica gel production and consumption. It started to research silica gel that will not crack when exposed to water as early as the 1970s. This method was adopted at first. The early research on water resistant silica gel for air separation in China continued the foreign method, that is, the silica gel powder and silica sol were used to react to produce silica gel, and the raw materials were all finished silica gel. In the 1990s, water resistant silica gel has been prepared directly from sodium silicate and sulfuric acid. Compared with the former method, the first preparation process is saved, mainly through the control of subsequent process conditions. The raw materials are the same as traditional silica gel. With the deepening of research, aluminum is added to the synthesis of water resistant silica gel as a reinforcement of silica gel skeleton structure. The structure of - [si-O-AI] - makes the particles have better stability when encountering water. The influence of aluminum source selection on all aspects of product performance is also worth studying.

Water resistant silica gel of air separation can make up for the shortage of silica gel cracking when encountering water. Through the analysis of various factors affecting the water resistance of silica gel, we can find different methods and measures to enhance its water resistance. Water resistant silica gel of air separation is different from ordinary silica gel in structure and some properties. Great achievements have been made in the research of its water resistance and adsorption at home and abroad, and it is used in drying, adsorption, catalysis and other aspects. In the future research process, the water resistance of the silica gel can be further enhanced and its synthetic materials and processes can be selected and optimized to make the water resistant silica gel more superior and more widely used.