Hydrated Silica (English name Hydrated Silica; Silicondioxidehydrate), also known as white carbon black , also known as light silica, the main component is silica, white amorphous powder.
Light Loose, soluble in caustic and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid). High temperature, nonflammable, tasteless, odorless, with good electrical insulation.
Its performance is similar to carbon black , but it is white.The molecular formula and the structural formula can be represented by SiO2 · nH2O, where nH2O is present as a surface hydroxyl group. Its macroscopic structure is similar to carbon black, the particles are spherical, single particles between the surface contact, was chain-like structure.
Chain structure and hydrogen bond force to form a group of aggregates. The original particles are very fine, absorb moisture in the air to form aggregated fine particles. Silica particles on the surface of hydroxyl particles, mainly isolated hydroxyl, adjacent hydroxyl, silicon three. Wherein the adsorption of polar groups from adjacent hydroxyl groups is important.
The presence of these groups makes the silica surface has a strong hydrophilic, surface area and dispersion capacity are large, mechanical strength and tear resistance are high.
High temperature does not decompose, high insulation, with small particles, large surface area, high structural characteristics.
Mainly used for the rubber industry excellent light reinforcing agent, lubricants, insulation materials. Can be dilute sodium silicate solution and dilute hydrochloric acid reaction system.