Home Cosmetic Science Talk Formulating Suspending mica in liquid soap… but actually that’s not the real bottom

  • Suspending mica in liquid soap… but actually that’s not the real bottom

    Posted by marimaster_3991 on April 27, 2023 at 2:00 pm

    Hey, guys!

    My client wants to make her “honey liquid soap” with us and she already has a formula that she used to do handmade. It goes like this:

    water — qsp

    SLS — 24%

    cocamidopropyl betaine — 24%

    euperlan pk 771 — 11%

    honey extract — 1,5%

    propolis extract — 1,5%

    parfum — 1,8%

    mica — 0,33%

    It has mica on it, but the product is not thick enough to suspend it. Turns out I can’t reproduce this formula with any gelling agent available in lab to suspend it, the visco always breaks. I’ve tried carbopol ultrez 21, hec and acrypol 940. She wants to keep it “slightly clear” so i’m avoiding the use of clays.

    Since it’s a SLS system, i wonder if just adding NaCl would suspend the mica. Can anyone suggest some other thickening agent(s) to suspend mica whitout clouding the product?

    thanks in advance! p.s. i know her formula doesn’t have any preservative system, i’m working on it lol

    BetaOneChem replied 7 months, 1 week ago 4 Members · 3 Replies
  • 3 Replies
  • ketchito

    April 27, 2023 at 9:49 pm

    That formula has a lot of CAPB. Keep in mind that CAPB can have up to 5-7% of NaCl, and maybe that’s why viscosity breaks when using acrylates.

    Is your SLES the one of 25% active, or the 70%? You could make a gel based on surfactants only (use a 3:1 ratio of SLES:CAPB as active matter), but I’m not sure it’d keep your mica from settling, especially in warm weather.

  • evchem2

    April 28, 2023 at 10:59 am

    You might be able to build viscosity from salt-thickening (@ketchito ‘s answer is solid), but it may not provide enough suspension

    You could try ARBALON (distributed by Lubrizol), it requires some high speed mixing to disperse and might not be the cheapest option, but it should work well in your system. Just note that this does not add viscosity.

  • BetaOneChem

    April 28, 2023 at 4:31 pm

    Carbopol Aqua SF-1 is a good Thickener. Has back acid Thickening and suspending properties. Carbopol ultrez 21 is okay for emulsions or cream systems, but I dont like using it for surfactant systems.it has limited electrolyte tolerance.

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