The application of precipitated silica in coatings is mainly reflected in the following aspects:
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1. As a matting agent
Precipitation method silica has good extinction effect, which can form micro concave convex structures on the surface of the coating through its small particles, causing diffuse reflection of light and reducing the glossiness of the coating. The extinction efficiency is related to the particle size distribution and pore volume. The smaller the particle size and the larger the pore volume, the better the extinction effect.

2. Improve coating performance
The precipitation method of silica can significantly improve the weather resistance, scratch resistance, and coating hardness of coatings. Its high specific surface area and porosity enable it to enhance the density and adhesion of the coating. In addition, it can improve the dispersibility and stability of the coating, preventing coating settling.

3. Rheological control and thickening
Precipitation method silica can also be used as a rheological control agent and thickener in coatings. Its high oil absorption value and porosity enable it to regulate the rheological properties of coatings and improve construction performance.

4. Surface treatment and dispersibility
In order to be better applied to water-based coatings, precipitation method silica is usually subjected to surface treatment. For example, by adding ether based non-ionic surfactants, their dispersibility and redispersibility in water-based coatings can be improved, and even if precipitation occurs after prolonged storage, they can quickly redisperse.

5. Application Fields
Precipitation method silica is widely used in various coating systems, including architectural coatings, wood coatings, automotive coatings, and anti-corrosion coatings. In anti-corrosion coatings, it extends the service life of coatings by enhancing their density and corrosion resistance.
usage method

Addition amount: The amount of silica added by precipitation method is usually determined according to the specific requirements of the coating, and the mass fraction in the coating is generally 3% to 10%.
Preprocessing: In order to improve dispersibility, precipitated silica is usually pre prepared into a dispersion or surface treated to enhance its compatibility with the coating system.
Mixing method: During the coating preparation process, precipitated silica can be uniformly dispersed in the coating system by high-speed stirring or grinding.
Precipitation method silica has become an indispensable and important additive in the coating industry due to its excellent physical and chemical properties and cost advantages.