수용상에서 알킬 폴리코사이드가 흡착된 침강성 탄산칼슘의 분산 안정성에 관한 연구

Abstract

The electrostatic and dispersion properties of precipitated calcium carbonate suspension adsorbed with alkyl polyglycoside were investigated. The pH of suspension was adjusted to 6, 8, and 12 to investigate the effect of suspension pH on adsorption of APG surfactant onto calcium carbonate particle. The adsorption amount of APG onto calcium carbonate particle was exhibited to depend on surface charge of particle. The higher surface charge, the more amount of APG was adsorbed onto particle surface and by the adsorption of APG molecules, the surface potential of calcium carbonate particle was markedly decreased. In low APG concentration, the dispersion stability of suspension does not show a relationship with zeta potential at all suspension pH and exhibits very poor stability. This indicates that the hydrophobic interaction among particles caused by hydrophobic surface property destabilizes the suspension, and this destabilization region continued to monolayer coverage of sufactant layer. After this monolayer saturation, the adsorption amount abruptly increases caused by formation of admicelles or bilayer of surfactant on surface. Up to this monolayer surface concentration, the dispersion stability shows proportionality with zeta potential.