In pulp processing, silica colloid with high specific surface area has negative charge both in acidic and alkaline conditions. Together with cationic polymer, it can help flocculation, and smaller fibers can also be quickly clarified to achieve better environmental benefits.
Using 1-7% silica sol to coat the surface of paperboard can significantly improve the friction coefficient of paper surface to prevent rapid yellowing of paper.
The special porous coating prepared by silica sol is used for modern coated paper, which makes the coating more colorful and higher resolution, and is used for high-gloss and matt printing photo paper.