What is silica gel and what is its use?

Silica gel (silica gel; Silicon rubber is a kind of high-activity adsorption material, which belongs to 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.

dielectric coefficient

Silica gel with different uses has different dielectric constants. The high dielectric constant silica gel used in electrical industry has a dielectric constant as high as (1 kHz) 20-30. At present, the dielectric constants of thermal conductive silicone grease used in mainstream radiators in the electronic field are all greater than 5. 1.

classify

Generally speaking, silica gel can be divided into organic silica gel and inorganic silica gel according to its nature and composition. According to its composition and shape, it can be divided into extruded silica gel and molded silica gel.

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 with the chemical molecular formula of msio2.nh2o. It is 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 a kind of organosilicon compound, which refers to a compound containing Si-C bond and at least one organic group directly connected with silicon atom. Traditionally, those compounds that connect organic groups with silicon atoms through oxygen, sulfur, nitrogen, etc. Also known as organosilicon compounds. Among them, polysiloxane with siloxane bond (-Si-O-Si-) as the skeleton is the most widely studied and applied organosilicon compound, accounting for more than 90% of the total dosage.

The extrusion of silicone is more common, such as the sealing ring on the household rice cooker, which is called the silicone sealing ring of the rice cooker.

Molded silicone is a little more complicated and irregular in shape, including silicone bowls, silicone ice cubes, silicone cake molds and so on.