Silica, also known as gas phase Faraday oxide, is an important industrial material and is widely used in the coating industry. Proper surface treatment can effectively improve the performance of silica in coatings, thereby optimizing the overall quality of coatings. The following is a detailed description of the surface treatment technology of silica in coatings:

1. Overview of surface treatment technology

Surface treatment technology of silica mainly includes chemical treatment, physical treatment and filler surface treatment. These treatment technologies are aimed at changing the surface properties of silica, such as hydrophilicity, dispersibility and coverage, to better meet the application requirements of coatings.

2. Specific surface treatment technology

Coupling agent modification

Principle: Some functional groups on the coupling agent react chemically with the hydroxyl groups on the surface of silica to change the group structure and distribution on the surface of silica, thereby improving the compatibility with the matrix and its own dispersibility.

Application: In coatings, silica modified by coupling agents can better combine with the coating matrix to form a uniform coating, improving the gloss and durability of the coating.

Surfactant modification

Principle: By adding surfactants, the silica particles form a network structure, which increases their specific surface area and oil absorption performance.

Application: In coatings, surfactant-modified silica can enhance the fluidity and wettability of the coating, and help to form a smooth and uniform coating.

Surface grafting modification

Principle: Through chemical grafting, macromolecular polymers with the same properties as the coating matrix are grafted on the surface of silica, thereby enhancing the interaction between the particles and the matrix and changing the polarity of the particle surface.

Application: Surface grafted silica has better dispersibility and stability in coatings, which helps to improve the overall performance and durability of coatings.

Ionic liquid modification

Principle: Ionic liquid modifiers are used instead of traditional organic phase modifiers to modify silica. Ionic liquids have the advantages of being liquid at room temperature, strong conductivity, high stability and good solubility.

Application: Silica modified by ionic liquids has better environmental performance and compatibility in coatings, which helps to reduce volatile organic compound (VOC) emissions in coatings.

Macromolecular interface modification

Principle: Use macromolecular polymers containing polar groups as modifiers. In the process of modification reaction with silica particles, more polar epoxy groups are introduced while maintaining the basic main chain structure.

Application: The silica after macromolecular interface modification can significantly improve the compatibility with the matrix in the coating, achieving a better interface modification effect.

3. Selection and application of treatment technology

When selecting the surface treatment technology of silica, factors such as the type of coating, performance requirements and production process need to be considered. Different treatment technologies have different performance improvement degrees and application ranges for silica. Therefore, in practical applications, it is necessary to select and adjust according to specific circumstances.

4. Conclusion

The surface treatment technology of silica in coatings is of great significance to improving the overall performance and quality of coatings. By selecting appropriate surface treatment technology, the dispersibility, stability and compatibility of silica can be significantly improved, thereby optimizing the performance and application effect of the coating. With the advancement of science and technology and the innovation of technology, it is believed that the application of silica in coatings will be more extensive and in-depth.