What make Silicone soluble in such hair cream?

FekherFekher Member
edited April 10 in General
Hi friends working on hair cream i found this formulation:
Water : Qsp
Mineral oil : 10%
Stearic Acid: 5 %
Glycerin: 5 %
Myristyl Myristaric: 3%
glyceryl stearic: 3%
Dimethicone: 2%
Lanolin : 2 %
TEA : 1,5 %
Carbomer : 0,5 %
preservative : 0,25%.
So i guess it is the Myristyl Myristaric that solubilise dimethicone , is it right or other ingredients did it?

Comments

  • Chemist77Chemist77 Member, PCF student
    I would say more likely suspended with the help of carbomer, that formulation seems to be having a higher viscosity with that much of carbomer. 
  • ngarayeva001ngarayeva001 Member
    edited April 10
    Is TEA used as an emulsifier here?
  • Chemist77Chemist77 Member, PCF student
    TEA will neutralize the FA & carbomer both.
  • PerryPerry Administrator, Professional Chemist
    @ngarayeva001 - TEA is not an emulsifier, it's a neutralizer.
  • FekherFekher Member
    @ngarayeva001 actually yes the emulsifiers in that product are glyceryl stearate and  triethanolstearate ( reaction of triethanolamine with stearic acid , carbomer needs just 0,75 % of TEA or less) even the  book says that it is o/w emulsion so glyceryl stearate can not alone provide o/w emulsion )
    so TEA is used as emulsifier with stearic acid i make the calculation of required hlb and hlb of  emulsifiers and i found two near values .
  • FekherFekher Member
    edited April 10
    @Chemist77 do you think that carbomer can alone stabilise 2% of dimethicone ?
  • @Perry, I supposed it might be an emulsifier in this formula because it’s concentration is too high to be a neutraliser only, there’s stearic acid in the formula, and glyceryl stearate alone wouldn’t be sufficient as an emulsifier. TEA-stearate is used surprisingly often notwithstanding of the high pH.
  • Is it Peg 12 Dimethicone by chance?
  • PerryPerry Administrator, Professional Chemist
    @ngarayeva001 - I was just referring to the TEA ingredient by itself. If a chemical reaction happens and you get TEA-stearate then that can be an emulsifier. 

  • FekherFekher Member
    edited April 10
    @Dirtnap1 actually it is just dimethicone.
  • Chemist77Chemist77 Member, PCF student
    edited April 11
    0.5% carbomer (I assume it is 940) by itself gives a very thick gel and I believe it will be sufficient to give you a very stable emulsion with the suspended dimwthicone. Though I haven't tried adding 2%. 
  • FekherFekher Member
    @chemist77 i take a look for the reference actually it is carbomer 934.
  • GuntherGunther Member
    @Fekher why not just use a proven emulsifier like BTMS or CETAC+cetearyl alcohol?
    Not only they're proven to emulsify silicones, they also condition hair.
  • FekherFekher Member
    @Gunther actually it can be a good solution but i want to understand such formulation i guess that it works cause i found it in cosmetic formulation book and such formulation will be better for cost's side.
  • @Fekher, what’s your concern with dimethicone? 
  • FekherFekher Member
    edited April 11
    @ngarayeva001 actually working on hair cream i find that formulation intersting so before developping work i want to understand formulation in this one just dimethicone i'am not sure how it is stabilised i have idea that Dimethicone is soluble in many ester that's why my doubts go for myristyl mysristarate . anyway thanks for your reply you are always helpful ☺.
  • I use dimethicone in many formulas and I don’t think you need any special effort to stabilise 3%. Just think of it as oil 
  • FekherFekher Member
    @ngarayeva001 you meant you just use carbomer or  using emulsifiers by any special effort ☺?
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