Home Cosmetic Science Talk Formulating Stearamidopropyl Dimethylamine in Shampoo

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  • Stearamidopropyl Dimethylamine in Shampoo

    Posted by abdullah on July 6, 2020 at 12:33 am

    Does anyone know how to add Stearamidopropyl Dimethylamine in Shampoo instead of cationic guar without heating the whole batch to 75°c? 

    Shampoo is cold process and ingredients are as follow. 

    SLES
    CAPB
    Lauryl Glucoside
    Coco Glucoside
    Decyl glucoside
    Sodium phytate
    Cationic guar
    Glyceryl oleate 
    Benzyl alcohol and DHA
    Citric acid

    I want to replace cationic guar that we use at %0.3 with Stearamidopropyl Dimethylamine because of buildup on hair. 

    abdullah replied 3 years, 8 months ago 3 Members · 5 Replies
  • 5 Replies
  • oldperry

    Member
    July 6, 2020 at 12:26 pm

    You can’t.  Stearamidopropyl Dimethylamine is a cationic surfactant and you have to melt it to get it to disperse in water. It also isn’t a suitable substitute for catinoic guar.

  • abdullah

    Member
    July 7, 2020 at 9:35 am

    @Perry  So what is a good replacement for cationic guar in thisSthis with no or minimum buildup? 

  • oldperry

    Member
    July 7, 2020 at 12:39 pm

    Polyquaternium-10 or Polyquaternium-7 or use another version of Guar (e.g. Hydroxypropyl Guar Hydroxypropyltrimonium Chloride).

    Guar is not an ingredient that normally causes problems of build-up.

  • zikiki

    Member
    July 7, 2020 at 1:13 pm

    Stearamidopropyl or alkylpropyl dimethylamine in general, are non-ionic surfactant in natural form. So if you use some acid and make your solution at PH<PKa of the protonated form of amine, you will have their protonated form, and the surfactant began ionic. In that form are very more soluble, and u don’t need to go at their melting point. Just warm up slightly.

  • abdullah

    Member
    July 8, 2020 at 9:04 am

    @zikiki like what pH for Stearamidopropyl Dimethylamine?

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