Silica white, also known as fumed silica or precipitated silica, is an important inorganic chemical raw material. Its chemical formula is SiO2, and it appears as a white powder with a high specific surface area and excellent physicochemical properties.

Due to its unique nanoscale structure and surface properties, silica white has a wide range of applications in rubber, plastics, coatings, inks, papermaking, pesticides, cosmetics, and other industries. In the rubber industry, silica white acts as a reinforcing agent, significantly improving the hardness, abrasion resistance, tensile strength, and tear strength of rubber products. In the plastics industry, it serves as a filler and thickener, enhancing the processing and mechanical properties of plastics. Additionally, silica white is used to improve the hiding power, weather resistance, and abrasion resistance of coatings, as well as the dispersion and printing effects of inks.

The preparation methods of silica white mainly include the gas phase method and the precipitation method. The gas phase method involves the hydrolysis or oxidation reaction of silicon tetrachloride or silane at high temperatures to produce nanoscale silicon dioxide particles. This method yields silica white with high purity and good dispersion, but the cost is relatively high. The precipitation method utilizes the reaction of sodium silicate or ammonium silicate with inorganic acids such as sulfuric acid or hydrochloric acid to generate silicon dioxide precipitate, which is then filtered, washed, and dried to obtain silica white. The precipitation method produces silica white at a lower cost, but the particle size and distribution may not be as uniform as those obtained by the gas phase method.

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