Effect of Sodium Dodecylbenzene Sulfonate Mixed Polyvinyl alcohol Adsorption on the Dispersion Stability of Ceramic Glaze Suspension

Abstract

The dispersion stability of ceramic glaze particles, including kaolin, limestone, quartz and feldspar suspension, achieved through adsorption of single and mixed of uncharged polymer polyvinyl alcohol (PVA) and anionic surfactant sodium dodecylbenzene sulfonate (SDBS) were investigated. Both adsorption isotherms and the zeta potential were studied in order to understand the dispersion stability as a function of polymer and surfactant concentration at pH 9 and 0.01 M NaCl. It was found that the PVA strongly adsorbed on the ceramic glaze and the zeta-potential decreased slowly upon addition. The stability of these dispersions is relatively poor. The higher adsorption of PVA onto ceramic glaze particles was obtained using pre-adsorbed SDBS ceramic glaze particles. This  lead to improve stability by introducing additional negative charges on the polymer chain giving rise to an extra electrical double layer repulsive force in addition to the steric force between ceramic glaze particles. It was interesting that the adsorption of SDBS on ceramic glaze particles in the pre-adsorbed PVA (PVA+SDBS) was lower than that of single SDBS, but the dispersion stability was higher than the single SDBS adsorption. It was probably due to cooperative adsorption of PVA-SDBS complexes. It can be concluded that the optimum condition for addition of PVA and SDBS influenced the dispersion stability of ceramic glaze component suspensions. Either electrical double layer repulsion or steric repulsion from PVA-SDBS complexes adsorption can increase dispersion stability depending on the concentration of surfactant or polymer added.