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Silica sol can also be called silica gel. Generally speaking, silica gel can be divided into organic silica gel and inorganic silica gel according to its properties and components.
Inorganic silica gel is a highly active adsorption material, which is usually prepared by reacting sodium silicate with sulfuric acid and undergoing a series of post-treatment processes such as aging and acid foaming. Silica gel is an amorphous substance, and its chemical formula is mSiO2 .nH2O. It is insoluble in water and any solvents, non-toxic, tasteless, chemically stable, and does not react with any substances except strong alkalis and hydrofluoric acid. Various types of silica gel form different microporous structures due to different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that other similar materials are difficult to replace: high adsorption performance, good thermal stability, stable chemical properties, high mechanical strength, etc., household use as a desiccant, humidity Conditioner, deodorant, etc.; industrially used as oil hydrocarbon decolorizer, catalyst carrier, pressure swing adsorbent, etc.; separation and purification agent for fine chemical industry, beer stabilizer, paint thickener, toothpaste friction agent, matting agent, etc.
Organic silica gel is an organosilicon compound, which refers to a compound that contains Si-C bonds and at least one organic group is directly connected to the silicon atom. It is customary to use oxygen, sulfur, nitrogen, etc. to make the organic group and silicon Compounds with connected atoms are also regarded as organosilicon compounds. Among them, the polysiloxane composed of silicon-oxygen bond (-Si-O-Si-) as the skeleton is the most numerous, the most researched and the most widely used type of organosilicon compounds, accounting for more than 90% of the total amount. .
Extrusion of silica gel is more common. For example, the sealing ring on household rice cookers is called rice cooker silicone sealing ring.
Molded silica gel is a bit more complicated and has irregular shapes, including silicone bowls, silicone ice trays, silicone cake molds, and so on.