Properties of Mixed System of N-Coco Propylene Bis-guanidine Acetate (CPGA) and Nonionic Surfactants

To study the effect of nonionic surfactant on the properties of cationic surfactant N-coco propylene bis-guanidine acetate (CPGA), different ratios of CPGA and fatty alcohol polyoxyethylene ether (AEO(9)) or alkyl polyglycoside (APG1214) were mixed, respectively. The surface activity, interaction parameters, and the application performances of wetting, emulsification and foam of the mixed system were investigated systematically. After the addition of AEO(9) or APG1214, the critical micelle concentration (CMC) of mixed system changes distinctly. The results of interaction parameters indicate that the synergistic effects exist between CPGA and AEO(9) or APG1214, and the micellizations of the mixtures are spontaneous. The change trend of the equilibrium contact angle is similar to that of the surface tension at CMC (gamma(CMC)) for the corresponding mixed system. The improvement of wettability of CPGA by AEO(9) is significantly stronger than that by APG1214. The emulsifying capacity of CPGA to liquid paraffin or soybean oil is almost enhanced by AEO(9) or APG1214. AEO(9) has clear defoaming effect on CPGA, and only a small amount of APG1214 can increase the foam stability of CPGA.