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Home Cosmetic Science Talk Formulating When to add NACL to cationic emulsion to increase the viscosity?

  • When to add NACL to cationic emulsion to increase the viscosity?

    Posted by Abdullah on November 14, 2021 at 5:49 am

    In order to add a 1% solution of NACL to cationic emulsion to increase and adjust viscosity, how would you proceed?

    1. Add NACL solution when then emulsion has cooled down

    2. Add NACL solution whe the emulsion is still ho(about 60°c)

    If 2 the how to you know vhow much nacl do you need? 

    Abdullah replied 1 year, 6 months ago 2 Members · 3 Replies
  • 3 Replies
  • chemicalmatt

    November 15, 2021 at 1:46 pm

    @Abdullah The amount and limit of salt addition is co-dependent with the alkyl functional group and concentration of the quat used. CETAC and neutralized amine salts (e.g. stearamidopropyl dimethylamine) give best response to salt thickening. I’ve found adding it after the product has coalesced at around 35 - 40C is best, although with some systems I’ve added at RT no problem. 

  • Abdullah

    November 15, 2021 at 2:21 pm

    @chemicalmatt what percentage of SPDMA minimum is needed for salt response and in what range of salt additional does it increase the viscosity?

    I did make an emulsion with 0.5% SPDMA and added up to 0.08% NACL but didn’t get any viscosity increase.
    This was my formula

  • Abdullah

    November 16, 2021 at 1:18 am