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Amphoteric surfactants - CAPB and more
Hi,
I’m currently experimenting with surfactant systems (over a year now but I’m still learning). At this point, I’ve only used CAPB as my amphoteric surfactant (with combination of nonionic and anionic materials, mainly sulfate free formulations). I’ve discovered surfactant combinations where a high level of CAPB worked pretty well (1 anionic: 5 amphoteric on an active basis combined with nonionics), but in my most current formulations I had to lower the level of CAPB I used to use in order to make my formula more skin friendly (I experienced skin irritations and/or dryness with higher level of CAPB even if I combined it with anionic and nonionic surfactants - the difference was in the nature of the anionic surfactant, CAPB and nonionics were the same in the same levels as I used before). I have a few questions that I would like to ask, it would help in my learning process:
1. Is the nature of anionic surfactant which really matters in determining the concentration of CAPB (the optimal anionic: capb ratio)? Is there anything (methods or sources) which can help me in general to determine the optimal anionic:amphoteric ratio for skin mildness?
2. Which anionic surfactants work well with higher level of CAPB (by that I mean at least 1:3 on an active basis)?
3. Which amphoteric surfactant do you prefer to use? CAPB or Sodium cocoamphodiacetate or cocamidopropyl hydroxysultaine or a combination of them? Are they differ in skin mildness and skin feel?
Thanks you very much.
Zoya
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