Effect of Dispersants Pre-Adsorption and Grinding on Dispersion Performance of Kaolin Pigment

Abstract:

The solid content of kaolin pigment suspension used in paper coatings must be as high as possible in order to minimize the drying cost. X-ray photoelectron spectroscopy (XPS) analysis on elemental compositions showed that, the kaolin combined less dispersants possessed worse dispersion capacity. Therefore, the effect of pre-adsorption of organic or inorganic negatively charged polymers sodium polyacrylate (PAA) and sodium hexametaphosphate (HMP) on the dispersing performance of concentrated kaolin suspensions was investigated, moreover, the effect of pre-adsorbing with or without grinding processing was evaluated. It was found that the viscosity of PAA pre-adsorbed kaolin decreased considerably, probably due to the stronger electrostatic repulsion. And grinding treatment had a dramatical influence on the dispersing behavior of kaolin with PAA pre-adsorbed on, resulting in low relative viscosity at high solid content.

• Periodical: Advanced Materials Research (Volume 748)
• Pages: 41-45
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.748.41
• Online since: August 2013
• Authors: Li Hong Zhao, Liu He, Bei Hai He
• Keywords: Dispersion Capacity, Grinding, Kaolin Pigment, Pre-Adsorption

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