Hydrophilic fumed silica

Hydrophilic fumed silica is prepared by hydrolyzing volatile chlorosilanes in a hydrogen-oxygen flame. From a chemical point of view, these loose white powders are composed of high-purity amorphous silica. Hydrophilic silica can be wetted by water and can be dispersed in water. In addition to applications in traditional industrial fields such as polyester, silicone, paints and coatings, more and more hydrophilic fumed silica products are successfully applied in high-tech fields. The nano-particle characteristics and high purity of fumed silica have played a leading role in its application in the electronics and optical fiber industries. The hydrophilic fumed silica product has an amorphous structure by X-ray analysis. According to different markets and application areas, we can provide primary particles with different particle sizes and products with different specific surface areas. Some fumed white carbon black products can be supplied after compression, and some products are pharmaceutical grade.

Hydrophilic fumed silica functions: suitable for processing and adjusted to the best rheology; reinforcement of silicone elastomers; thickening of non-polar liquids; glidants for food and industrial powders; high chemistry Purity; excellent insulation performance even at high temperature; liquid is transformed into powder, such as medicine and cosmetics.

Hydrophobic fumed silica

Hydrophobic fumed silica is prepared by chemical reaction between hydrophilic fumed silica and active silane (such as chlorosilane or hexamethyldisilazane). It is hydrophobic (hydrophobic) and cannot be dispersed in water. In order to solve some special technical problems in the industry, various types of hydrophobic fumed silica have been developed. For example, the hydrophobic fumed silica is produced by treating the modified hydrophilic grade fumed silica with silane or siloxane. In the final product, the chemical treatment agent is chemically bonded to the original hydrophilic oxide. superior. In addition to the above-mentioned advantages of hydrophilic products, the characteristics of hydrophobic fumed silica products are: low moisture absorption, good dispersibility, and rheological adjustment ability even for polar systems. Some products undergo structural modification on the basis of hydrophobic treatment, which can provide further help for customers to develop new products and improve product performance. For example: in a liquid system, the hydrophobic gas phase white carbon black can reach a high addition amount, but has little effect on the viscosity of the system.

The function of hydrophobic fumed silica: the most suitable rheology in processing and use; thickening of polar liquids, such as epoxy resin; reinforcement of silicone elastomers; high dosage, such as in molded products; good Hydrophobicity, improve corrosion resistance; improve dielectric properties, such as in cable composites; powder glidants, such as powder coatings and fire extinguishing agents, etc.; improve scratch resistance in coatings and plastics.