Inorganic silica gel is a highly active adsorption material, which is usually prepared by a series of post-treatment processes such as reaction of sodium silicate with sulfuric acid, aging, acid bubble and so on. Silica gel is an amorphous substance, and its chemical molecular formula is msio2.
. nh2o. Insoluble in water and any solvent, non-toxic, tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Due to different manufacturing methods, various types of silica gel have different microporous structures. The chemical composition and physical structure of silica gel determine that it has many irreplaceable characteristics: high adsorption performance, good thermal stability, stable chemical properties and high mechanical strength.
Silica gel is divided into macroporous silica gel, coarse silica gel, B-type silica gel and fine silica gel according to pore size. Because of the different pore structures, their adsorption properties have their own characteristics. Macroporous silica gel has higher adsorption capacity at high relative humidity, while microporous silica gel has higher adsorption capacity at low relative humidity, while type B silica gel has a pore structure between coarse pores and fine pores, and its adsorption capacity is also between coarse pores and fine pores. Macroporous silica gel is generally used as catalyst carrier, matting agent, toothpaste abrasive and so on. Therefore, different varieties should be selected according to different uses.