| In this paper, the PCC flocculates retention in the paper was investigated, and the particle size and Zeta potential of the flocculate in the suspension were measured. In order to explain the formation mechanism of the flocculate of PCC+CS(cationic starch)+CP3(anionic organic polymer), electrostatic field theory was introduced. When adding CS solution into the PCC suspension, weak flocculation which could not resist high shear occurred. The flocculate could be idealized as a hollow sphere. According to the electrostatic field theory, there was an electric gradient in the vertical direction of a micro plane. When the negative charged CP3 was added into the suspension, it would move into the sphere by the electric force, and the whole flocculate probably shrunked. In that case, the flocculate could suffer high shear and had a better retention in the paper. |
