Silica (precipitated silica) is one of the most common fillers in the rubber, plastics, and coatings industries. However, the large number of hydroxyl groups on the surface of silica makes it highly hydrophilic and prone to aggregation, posing challenges to dispersion and interfacial bonding. How to achieve better compatibility of silica in organic systems has long been a key issue of concern in materials science.

Dimethyl diethoxysilane plays an important role in the surface modification of silica due to its reactive ethoxy structure. When it comes into contact with the hydroxyl groups on the silica surface, a condensation reaction occurs, forming stable Si–O–Si bonds, thereby transforming the originally hydrophilic surface into a hydrophobic structure. The treated silica particles can be more easily dispersed into the polymer matrix, improving the material's uniformity and mechanical properties.

This treatment method also reduces the adsorption of other additives by silica during the mixing process, improving the processing performance of the rubber compound. For example, in silicone rubber or silicone coating systems, modified silica can significantly improve the tensile strength, tear resistance, and thermal stability of the material.

Dimethyldiethoxysilane has a moderate boiling point, high purity, transparency, and ease of handling, making it an ideal choice for the lightweighting process of precipitated silica. With the development of composite material technology, the role of surface modifiers is becoming increasingly important, and these silane products are driving powder processing technology towards a more efficient and refined stage.