Five Core Functions of Precipitated Silica in Paint

High-Efficiency Matting

Precipitated silica, with its controlled particle size (3–10 μm) and precise pore size distribution, creates microscopic roughness on the paint film surface, enabling adjustable gloss from matte to full matte, with a soft, non-glaring sheen.

Anti-Settling/Anti-Agglomeration

The three-dimensional network structure and high surface area (150–240 m²/g) provide strong thixotropy, firmly "grasping" pigment and filler particles, completely eliminating hard settling, allowing for immediate use out of the bucket and minimizing secondary dispersion.

Thickening and Rheological Enhancement

The abundant silanol groups on the surface form a hydrogen bonding network with the resin system, increasing viscosity and preventing sagging at low shear levels. At high shear levels, the viscosity decreases, facilitating application and achieving "thick coating without runny, thin coating without smudging."

Improving Overall Paint Film Performance

Surface-modified precipitated silica significantly improves paint film hardness, abrasion resistance, scratch resistance, and aging resistance, extending outdoor service life. Partial replacement for diatomaceous earth/resin. Its high oil absorption (240–300 g/100 g) provides excellent load-bearing properties, allowing it to partially replace expensive diatomaceous earth in primers or putty systems, reducing formulation costs by 5–15%.

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