Modification of Ground Calcium Carbonate with Polyelectrolyte Multilayering Technique and its Effects on Deposition on Pulp Fibers andPaper Properties

摘要

High loading of inorganic fillers has drawn more attention from the printing and writing paper industry because of quality and cost saving aspects. Various technologies have been introduced to increase filler retention in paper sheet. Among them, layer-by-layer (LbL) multilayering of polyelectrolytes was considered in this study. Ground calcium carbonate (GCC) was modified by polyelectrolyte multilayering process. The effects of GCC modification through the polyelectrolyte multilayering technique ondeposition on pulp fibers and paper properties were investigated. The surface charge of GCC particles could be controlled depending on the type of polyelectrolyte in the outermost layer. The cationic LbL multilayered GCC particles could deposit on negatively charged cellulose fibers due to electrostatic attraction, following modified Langmuir deposition kinetics. The deposition rate constant and detachment rate constant were influenced by the polymer type and shear condition. The properties of paper were affected by types of polyelectrolytes in multilayering process. Most of the polyelectrolytes combinations improved tensile strength of paper.