Precipitated silica: Also known as hydrated silica, activated silica, precipitated silica, and precipitated hydrated silica.

English name: Silica

CAS RN: 14464-46-1

Molecular formula: SiO2 * nH2O.
White carbon black is a general term for white powdery X-ray amorphous silicic acid and silicate products. It mainly refers to precipitated silica, fumed silica, ultrafine silica gel and aerogel, and also includes powder. Synthetic aluminum silicate and calcium silicate. White carbon black is a porous substance whose composition can be expressed by SiO2 * nH2O, where nH2O exists in the form of surface hydroxyl groups. Soluble in caustic and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid). High temperature resistance, non-flammable, tasteless, odorless, and has good electrical insulation.

White carbon black is roughly divided into precipitation white carbon black and gas phase white carbon black according to production methods.

Gaseous method white carbon black is normally white amorphous flocculent translucent solid colloidal nanoparticles (particle size less than 100nm), non-toxic, and has a large specific surface area (100-400m2 / g) (using F-Sorb 2400 specific surface area BET method test). The fumed silica is all nano-silica, the product purity can reach 99%, and the particle size can reach 10-20 nm, but the preparation process is complicated and the price is expensive.

Precipitation silica is divided into traditional precipitation silica and special precipitation silica. The former refers to white carbon black produced using sulfuric acid, hydrochloric acid, CO2 and water glass as basic materials, and the latter refers to the use of hypergravity technology, sol-gel method, chemical crystal method, secondary crystallization method or reversed micelle micro Silica produced by special methods such as emulsion method.

Precipitated white carbon black is mainly used as a reinforcing agent for natural rubber and synthetic rubber, and a toothpaste friction agent.