① Hydrophobic Fumed Silica
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 fumed silica is produced by treating silane or siloxane with modified hydrophilic fumed silica. In the final product, the chemical treatment agent is chemically bonded to the original hydrophilic oxidation. Thing. In addition to the above advantages of hydrophilic products, the characteristics of hydrophobic fumed silica products are: low hygroscopicity, good dispersibility, and only rheological adjustment ability even for polar systems. Some products undergo structural modification on the basis of hydrophobic treatment, which can further help customers to develop new products and improve product performance. For example: In liquid systems, hydrophobic fumed silica can reach a high amount of addition, with little effect on the viscosity of the system.
★ Function of hydrophobic fumed silica:
• The most suitable rheology in processing and use
• Thickening of polar liquids, such as epoxy
• Reinforcement of silicone elastomer
• High additions, such as in molded products
• Good hydrophobicity, improve corrosion resistance
• Improve dielectric properties, such as in cable composites
• Powder glidants, such as in fire extinguishing agents
• Improved scratch resistance in coatings and plastics
 
② Hydrophobic Fumed Silica
Hydrophilic fumed silica Hydrophilic fumed silica is prepared by the hydrolysis of volatile chlorosilanes in a hydrogen-oxygen flame. From a chemical point of view, these loose white powders consist of high-purity amorphous silica. Hydrophilic silica can be wetted with water and dispersed in water. In addition to traditional industrial applications such as polyesters, silicones, paints and coatings, hydrophilic fumed silica products are increasingly used in high-tech applications. The nanoparticle characteristics and high purity of fumed silica have led 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 fields, we can provide primary particles with different particle sizes and products with different specific surface areas. Some fumed silica products can be supplied compressed, and some products are pharmaceutical grade.