Home Cosmetic Science Talk Formulating Is CAPB ruining BTMS emulsion?

  • Is CAPB ruining BTMS emulsion?

    Posted by gunther on December 5, 2018 at 6:00 pm

    In the following formulation

    40% demineralized water
    4% BTMS-50
    0.5% dimethiconol
    heat and stir
    a nice emulsion so far

    but when adding
    26% Dehyton-K (8% active cocamidopropylbetaine CAPB)
    it forms some crumbs
    I was expecting it too thin out, but not the crumbs.

    How to fix it?
    CAPB+BTMS is supposed to be already used in cleansing conditioners.

    ngarayeva001 replied 5 years, 3 months ago 2 Members · 1 Reply
  • 1 Reply
  • ngarayeva001

    December 5, 2018 at 7:27 pm

    I don’t have experience with these two products together but can suggest a couple of thoughts.
    CAPB is amphoteric. It is anionic at pH above 7 and cationic below 7 (please check if there are decimals, maybe it’s 6.something). So potentially you can resolve your problem by decreasing pH so that you have two cationic emulsifiers in your formula. Another point, CAPB is a surfactants. So is BTMS. Maybe you can mix surfactants separately and then add water?

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