MesoDyn density functional simulation method was used to study the interactions between lauryl alcohol polyoxyethylene (C12E10) and sodium Lauryl sulfate (SDS). The micro dynamic process of aggregate formation and the aggregate morphology were reported. The effect of shear to original phase was studied by simulating with varied shear rate. Intuitively demonstrate the gathering way for 20% C12E10/20% SDS system by two-dimensional slices analysis. On this basis, using benzene and octanol as oil, the oil elimination mechanism of 20% C12E10/20% SDS for these two representations were compared. Simulation results showed that a strong synergetic effect was between non-ionic surfactant C12E10 and anion surfactant SDS, as the accumulation behavior occurred when the respective concentration was very low. Different phases could be obtained at various shear rates for the same concentration, which to a certain extent explained the difference between the experiment and simulation. And it was found that the oil solubilization for the definite system was different because of the oil different structures. In a word, obtained results helped to enhance understanding of the synergistic interaction and can provided certain theory instructions for the duplicated system effective application.

Key words: lauryl alcohol polyoxyethylene, sodium lauryl sulfate, synergetic effect, mesoscopic simulation