PCC预絮聚体形成机理探讨

Study on the PCC Flocculation Formation Mechanism

中文关键词:  PCC预絮聚体  静电场  絮聚机理  PCC

Key Words:PCC flocculate  static electric filed  flocculation formation mechanism

中文摘要:

      通过对沉淀碳酸钙（PCC）絮聚体形成过程及在纸张中的留着进行观察，比较了PCC预絮聚和实际加填的差异，研究了PCC絮聚体粒径及Zeta电位的变化情况，探讨了用静电场理论解释PCC+CS（阳离子淀粉）+CP3（阴离子有机微聚物）絮聚体的形成机理。将絮聚体理想化为中空的球体，由静电场理论分析可知，在垂直于由PCC粒子和CS形成的絮聚体微小平面空隙的方向上存在电场梯度，在电场力的作用下，CP3可进入絮聚体的类球体内并对外球面产生相互吸引作用而可能产生收缩，这种电场作用力可使絮聚体结合更牢固，抗剪切能力增强。

Abstract:

      In this paper, the PCC flocculates 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.