Thickening oil with silica dimethyl silylate

Hi friends! I'm trying to thick an oil consisting of equal parts squalane, CCT, and octyldodecanol with silica dimethyl silylate. Sometimes and not always I get a bit of seperation of the product. One of the oils seems to come out of the gel. I'm thinking it's octyldodecanol but does anyone have any thoughts about silica dimethyl simulate and its compatibility with these 3 emollients?
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  • It doesn’t perform well with high polarity oils (the one I have is covasilic 15). I tried it in both octyldodecanol and CCT and it didn’t thicken them at all. I have not tried it in squalane, but it thickens hydrogenated polyisobutene. Since those two are both hydrocarbons and low polarity the thickening you see is probably due to squalane. And it is not surprising you see separation. Your oils have different polarities.
  • It doesn’t perform well with high polarity oils (the one I have is covasilic 15). I tried it in both octyldodecanol and CCT and it didn’t thicken them at all. I have not tried it in squalane, but it thickens hydrogenated polyisobutene. Since those two are both hydrocarbons and low polarity the thickening you see is probably due to squalane. And it is not surprising you see separation. Your oils have different polarities.
    @ngarayeva001 Thanks for your reply! If I were to keep the same oil profile and add in an additional oil thickening agent like polyamide-3. Would it likely improve the situation? If not is there anything you would recommend?
  • @ngarayeva001 or I also have polyhydroxy stearic acid
  • Cannot guarantee as I have not tested that myself but usually C12-15 Alkyl Benzoate helps with mixing silicones and high polarity oils, so maybe adding some to your blend helps it to mix properly. Speaking of polyamide-3, I tried polyamide-8 and it thickens quite well on its own. I read polyamide-3 thickens better than 8, so try it without silica. Polyamide-3 should be suitable for medium to high polarity.
  • ngarayeva001ngarayeva001 Member
    edited January 11
    Polyxydroxystearic acid is for dispersing pigments. It has some thickening properties but not much. It will also make your  oil blend cloudy. Btw, I had my eye on polyamide-3 for a while. Have you tried it? I wonder if it allows creating a transparent product? Polyamide-8 isn’t bad but it’s cloudy (and for non-polar oils)
  • @ngarayeva001 I haven't tried polyamide-3 on its own but I've used it in combo with silica dimethyl silylate. I'll try to increase the level of polyamide-3 and hope for the best! It doesn't seem to ALWAYS separate, just sometimes.
  • Even if it separates sometimes it’s a stability issue that needs to be addressed. Polarity should be considered when mixing oils. They all are very different.
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