Sodium Lauryl Glycine-Based Microemulsions and their Decontamination Properties for Complex Oil Stains
The preparation of microemulsions with sodium lauryl glycine (C12GlyNa) as the surfactant and the removal performance of the resultant microemulsions on complex oily stains were studied. The results show that the combination of C12GlyNa and butanol is a suitable emulsifier,which can emulsify a variety of non-polar and polar oils such as alkanes and isopropyl fatty acids to form C12GlyNa-based microemulsions. In the phase diagram,the area of the microemulsion with alkanes as the oil phase is 42.7％ higher than that of the fatty acid isopropyl ester as the oil phase,and the area of the C12GlyNa-butanol-octane-H2O (Kn=0.09) microemulsion is the largest,about 37.1％. Along the dilution line at the emulsifier to oil phase mass ratio of 9∶1,the microemulsion type gradually evolves in the order of water-in-oil (W/O),bicontinuous (B.C.) and oil-in-water (O/W) with the increase of water content,and the particle size of oil droplets in the O/W type microemulsion decreases successively. The O/W type C12GlyNa-based microemulsion removed 292％ more lipstick from the surface of silicone practice skin than a C12GlyNa micellar solution with the same concentration of surfactant. In addition,in the case of lipstick and eyeliner stains on human hand surfaces,the O/W C12GlyNa-based microemulsion was also found to remove the stains better than the corresponding concentration of C12GlyNa micellar solution.
sodium lauryl glycinemicroemulsioncomplex oil removalsilicone practice skinmicellar solution
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