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 kind of highly active adsorption material, which is usually prepared by the reaction of sodium silicate and sulfuric acid, and through a series of post-treatment processes such as aging and acid foaming. Silica gel is an amorphous substance, and its chemical molecular formula is mSiO2 .nH2O
It is insoluble in water and any solvent, non-toxic and tasteless。 It has stable chemical properties, which will not react with any substance except strong alkali and hydrofluoric acid. Various types of silica gel form different microporous structures due to their different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that are difficult to be replaced by other similar materials: high adsorption performance, good thermal stability, stable chemical properties, high mechanical strength, etc.
It is used as a household desiccant, humidity regulator, deodorant, etc; Industrial use as oil and hydrocarbon decolorizer, catalyst carrier, pressure swing adsorbent, etc; Separation and purification agents for fine chemicals, beer stabilizers, coating thickeners, toothpaste friction agents, matting agents, etc.
Organosilica gel is a kind of organosilicon compound, which refers to the compound containing Si-C bond and at least one organic group is directly connected with silicon atom. It is also customary to treat those compounds that connect organic groups with silicon atom through oxygen, sulfur, nitrogen, etc. as organosilicon compounds. Among them, polysiloxane, which is composed of siloxane bond (-Si-O-Si) as the skeleton, is the most widely studied and widely used type of silicone compounds, accounting for more than 90% of the total dosage.
The sealing ring on household rice cookers, which is called the silicone sealing ring of rice cookers.
Molded silicone is a little more complex and irregular in shape, including silicone bowl, silicone ice lattice, silicone cake mold and so on.