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Differences between Organosilicon Vapor Phase Silica - Hydrophilic Silica and Hydrophobic Silica

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Hydrophilic Smoked Silica
Hydrophilic fumed silica is formed by the hydrolysis of volatile chlorosilane in a hydrogen oxygen flame. Chemically, these loose white powders are composed of high-purity amorphous silica. Hydrophilic silica can be wetted and dispersed in water. In addition to its applications in traditional industrial fields such as polyester, organosilicon, coatings, and coatings, hydrophilic fumed silica products are becoming increasingly successful in the high-tech field. The nano particle characteristics and high purity of fumed silica play a leading role in applications in the electronics and fiber optic industries. Through X-ray analysis, the hydrophilic fumed silica product exhibits an amorphous structure. According to different markets and application fields, we can provide products with different particle sizes of primary particles and specific surface areas. Some gas-phase silica products are provided in compressed form, while others are pharmaceutical grade.

The Function of Hydrophilic Vapor Phase Silica
Suitable for processing, adjustable to optimal rheological properties; Reinforced silicone elastomer; Thickening of non-polar liquids; Flow aids for food and industrial powders; High chemical purity; Excellent insulation property even at high temperatures; Liquid turns into powder, such as medicine or cosmetics.

Hydrophobic smoke emitting silica
Hydrophobic fumed silica is prepared by reacting hydrophilic fumed silica with reactive silanes such as chlorosilane or hexamethyldisilazane. It has hydrophobicity (water repellency) and cannot be dispersed in water. In order to solve some special technical problems in industry, various types of hydrophobic gas-phase silica have been developed. For example, hydrophobic fumed silica is produced by modifying hydrophilic fumed silica with silane or siloxane treatment. In the final product, the chemical treatment agent is chemically combined with the original hydrophilic oxide.
In addition to the aforementioned advantages of hydrophilic products, hydrophobic gas-phase silica products are characterized by low moisture absorption, good dispersibility, and even rheological adjustment ability for polar systems. Some products undergo structural modifications on the basis of hydrophobic treatment, which can provide further assistance for customers to develop new products and improve product performance. For example, in liquid systems, hydrophobic gas-phase silica can be added in large quantities, with little effect on the viscosity of the system.

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