The structure of desiccant mainly includes the following aspects:
Chemical composition: The main component of desiccant is silicon dioxide, which is usually obtained by the reaction of sodium silicate and sulfuric acid, and a series of treatment processes such as aging and acid soaking. Silica gel is an amorphous substance with a transparent irregular sphere shape and an extremely fine pore mesh structure inside. These structures can absorb moisture and retain moisture through physical gravity.
Physical structure: The physical structure of desiccant has an important influence on its adsorption performance. For example, the internal structure of silica gel is a mesh with a large number of micropores that can absorb and retain moisture.
Adsorption principle: The adsorption principle of desiccant mainly includes physical adsorption and chemical adsorption. Physical adsorption is to adsorb water molecules into the structure of desiccant by physical means, while chemical adsorption is to absorb water molecules by chemical means and change its chemical structure to turn it into another substance.
Application field: Desiccant is widely used in moisture-proof and mildew-proof aspects. It can absorb moisture from the atmosphere and play a drying role. Common desiccants include acidic desiccants (such as concentrated sulfuric acid, phosphorus pentoxide), alkaline desiccants (such as soda lime, CaO, NaOH) and neutral desiccants (such as anhydrous calcium chloride).
