What material is silicone?
After the silica gel has absorbed moisture, it can be regenerated by solarization, baking and air drying.Chemical composition of silica gel desiccantSilica gel desiccant --- the main component is silica dioxide, from natural mineral by purification processing, granular or beads. As a desiccant, its pore structure (average 2A) Good affinity for water molecules. The most suitable hygroscopic environment for silica gel is room temperature (20~32) and high humidity (60~90%), which can reduce the relative humidity of the environment to about 40%.This is a absorb moisture from the atmosphere in the water, it is through the physical principle of drying the water molecule adsorbed on its structure or by chemical absorption of water molecules and change its chemical structure into another substance.Variable silica gel: used to keep the instrument and balance dry. Turn red after water absorption. The resulting silica gel can be dried and used again after regeneration. It can be dried amines, NH3, O2, N2 and so on
According to the size of the pore size, silica gel is divided into large pore silica gel, coarse pore silica gel, B type silica gel and pore silica gel. As a result of pore structure difference, therefore their adsorption performance has respective characteristic. Porous silica has a higher adsorption capacity at high relative humidity, kiselgel in conditions of low relative humidity is higher than the adsorption capacity of porous silica, and silica gel B as pore structure between coarse and fine pored silica gel, the adsorption between coarse and fine pores. Macroporous silica gel is usually used as catalyst carrier, matting agent, toothpaste, abrasive and so on. Therefore, different varieties should be chosen according to different uses.
Silica gel is a highly active adsorption material, belongs to the amorphous substance, and its chemical formula is mSiO2. NH2O. Insoluble in water and any solvent, non-toxic, tasteless, chemical stability, in addition to strong alkali and hydrofluoric acid, do not react with any substance. Different types of silica gel have different microporous structures because of their different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics which are difficult to be replaced by other similar materials: high adsorption properties, good thermal stability, stable chemical properties, high mechanical strength, etc..