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Home Cosmetic Science Talk Formulating Curdling with Triethoxycaprylylsilane coated Zinc oxide - what’s causing it?

  • Curdling with Triethoxycaprylylsilane coated Zinc oxide - what’s causing it?

    Posted by Zink on November 16, 2016 at 1:25 am

    The whole formula curdled around 45C during cool down under ~500 rpm mixing, then after high shear mixing and further cooling to 40C, the curdling was gone and the formula became homogeneous, thick and stringy - very strange and I’ve only seen this with coated ZnO, any idea what could be causing it?

    Water phase
    Water, Sodium PCA, Allantoin, Glycerin, Sclerotium Gum, Hyaluronic Acid, Ferulic Acid, Magnesium Ascorbyl Phosphate, Niacinamide, Panthenol.

    Oil Phase
    Zinc Oxide,Triethoxycaprylylsilane, Polyhydroxystearic Acid, Butyloctyl Salicylate, Capric/Caprylic Triglyceride, Caprylyl Methicone, Ceterayl Olivate, Sorbitan Olivate, Argan Oil, Glyceryl Stearate, Tocopherol. 

    Belassi replied 6 years, 2 months ago 2 Members · 3 Replies
  • 3 Replies
  • Belassi

    Member
    November 16, 2016 at 3:25 am

    Possibly the gum is reacting with another component, one of the organic acids. Try knocking out the gum and see.

  • Zink

    Member
    November 16, 2016 at 6:12 am

    I only see this with Triethoxycaprylylsilane coated ZnO, non-coated ZnO is fine. Could try Xanthan Gum instead.

  • Zink

    Member
    November 17, 2016 at 10:49 pm

    @Belassi think you were correct, xanthan gum fared a lot better!

  • Belassi

    Member
    November 17, 2016 at 11:20 pm

    Great, that’s always good to hear! Glad it worked out.