Abstract:

The mixing properties of a new surfactant for daily cosmetics were studied. Surfactant mixtures （NPG） were prepared by mixing sodium dodecyl sulfate （SDS） with the new surfactant （HDBC） which was a derivative of ethylene glycol bissuccinate containing monochlorohydroxypropyl, quaternary ammonium and sulfonate groups in different mixing ratios. Surface tension, wettability, hydrophilic-lipophilic balance, emulsifying property and foam property were tested. The results showed that when the mass concentration of the mixed surfactants reached 10 g/L, the minimum surface tension reached 31.5 mN/m, indicative of good surface activity. The surface tension of the new surfactant mixtures was decreased with the increase of mass concentration. The contact angle of the mixed surfactant solution was decreased with concentration, showing good wettability. The HLB values of the new surfactant mixtures were in the range of 10-18, showing good hydrophilicity. In addition, when the molar ratio of HDBC to SDS was 5∶5 and the mass fraction of NPG was 80%, the foam performance and emulsification performance were good.

Key words: surfactant, mixed system, surface tension, wettability, contact angle, hydrophilic lipophilic balance