A Brief History of the Development of Air Separation and Water-resistant Silica Gel
The raw material of early air separation water-resistant silica gel was finished silica gel or crushed rubber, which was obtained after mixing and processing with silica sol. Japan has been industrially manufacturing silica gel since 1950. It is a large country in the production and consumption of silica gel. As early as the 1970s, it began research on silica gel that would not crack when exposed to water. This method was initially adopted. Early domestic research on air-separated water-resistant silica gel followed foreign methods, which were produced by the reaction of silica gel powder and silica sol, and the raw materials were all finished silica gel. By the 1990s, water-resistant silica gel had been produced directly from the reaction of sodium silicate and sulfuric acid. Compared with the previous method, it saves one preparation process and is mainly achieved through the control of subsequent process conditions. The raw materials are the same as traditional silica gel. As research continues to deepen, aluminum is added to the synthesis of water-resistant silica gel as a reinforcing agent for the silica gel skeleton structure. The -[si-O-AI]-structure makes the particles more stable when exposed to water. The impact of the choice of aluminum source on various aspects of product performance is also worth studying.
Air separation water-resistant silica gel can make up for the shortcomings of silica gel bursting when exposed to water. Through the analysis of various factors that affect the water resistance of silica gel, different methods and measures can be found to enhance its water resistance. Air separation water-resistant silica gel is different from ordinary silica gel in structure and some properties. Research on its water resistance and adsorption properties at home and abroad has made great achievements, and it is used in various aspects such as drying, adsorption, and catalysis. In the future research process, its water resistance can be further enhanced and its synthetic raw materials and processes can be selected and optimized to make water-resistant silica gel have more superior properties and be more widely used.
Article classification: Product knowledge