The effects of emulsifier HLB value, dispersant dose and temperature on the emulsion particle size of rolling oil (c)

The effects of surfactant hydrophile Lyophile Balance (HLB) value, dispersa nt dose, and temperature on the emulsion particle size (EPS) of rolling oil were investigated. Altogether, three non-ionic emulsifiers with HLB value ranged from 3 to 14, and two dispersants with cloud point ranged from 60 de grees and 90 degrees C was employed. EPS of aqueous emulsions were monitore d at 50 degrees, 55 degrees and 60 degrees C. The destabilizing effects of adding iron fines and calcium ion at different temperature were also studie d. Results indicated that the EPS of emulsion generally decreases as the HLB v alue of emulsifiers was increased. Moreover, positive relationship exists b etween the EPS of emulsion and temperature, attributable to the cloud point s for the emulsifiers and dispersants. Emulsifiers with higher HLB value se emed capable of minimizing the iron fines and calcium ion destabilization e ffects. By choosing suitable combination of emulsifiers and dispersants, bo th loose and tight emulsions could be prepared with good stability.