Hydrophobic Fumed Silica

Hydrophobic fumed silica is produced by chemically reacting hydrophilic fumed silica with reactive silanes such as chlorosilane or hexamethyldisilazane. It is hydrophobic (water repellent) 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, hydrophobic fumed silica is produced by treating 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, hydrophobic fumed silica products are characterized by low hygroscopicity, 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, hydrophobic fumed silica can be added in a high amount with 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 addition, such as in molded products; good Hydrophobic, improve corrosion resistance; improve dielectric properties, such as in cable compounds; powder flow aid, such as in powder coatings and fire extinguishing agents; improve scratch resistance in coatings and plastics.