ketchito
Forum Replies Created
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@niecie2k Since there are some oils, Cetrimonium chloride will try to for an emulsion. Make a sample without it.
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@Anna_Maria You could try making a premix with the fragrance. If you use phenoxyethanol, you could add it to that mixture as well.
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@Abdullah Indeed, total free surfactant below CMC wouldn’t necessary be the sum of each free surfactant, measured separately.
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@aliciavr6 I have a similar product for a client, just not with so much glucoside and betaine (rather half). Do you need as much surfactant? Also, if you need more viscosity, try increasing the BTMS 25 and removing Crothix.
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@Abdullah CMC is determined using a tensiometer. For a mixture of surfactants, you’d need to make different blends, and use a tensiometer to evaluate the change on interfacial tension, same as what you’d do for a pure surfactant. It’d be wrong to just add the CMC of both surfactants since they’d find the way to form micelles to reduce the increasing interfacial tension.
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@drjayseesunish As mentioned before, guar gum and GHTC are two different ingredients (not alternatives for each other). In the case of Guar gum, I see no reason for clumping, rather than mechanical (eg., low mixing speed, inadecuate mixer, short mixing time). Gums have to be vigurously mixed and for quite some time, to priperly incorporate them and prevent clumping.
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@greencosmetic Lowering pH works to speed Cationig guar hydration, by dissolving the outer coating. Not sure you have the same type of coating in Guar gum, but you could try.
Now, I’ve seen so many episodes of separation when using guar gum, that I’d try using HEC or HMPC instead, if possible.
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@Annyeap CDE is not as good solubilizer as Polysorbates, but it’s enough for Menthol. Alternatively, you could try with your glucoside instead of CDE (although I’ve never tried it that way, so I don’t know if that would work).
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@Abdullah It’s always better to add xanthan gum at the start, where it has more water available, and you can use more mixing to disperse it without risk of aeration. Now, formulas thickened with high levels of NaCl tend to dramatically reduce viscosity in a warmer environment, so there’s a risk of sedimentation from your pearl (put a sample in the oven and see what happens).
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@zetein After the big peak in viscosity for SLES, what you see is that the giant worm-like micelles are being broken into smaller rods, that’s why the decrease in viscosity. Not sure though if they can further be reformed into a lamellar conformation, since the packing of anionics is not precisely convenient for such ordered and tight structure.
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1. You need to have both species in the same (liquid) form for assisted deposition to happen, but EGDS is usually floating around as crystals
2. Glyceryl oleate forms W/O emulsions; if you use it as emollient for instance, in a shampoo and in the presence of cationic guar, then guar could flocculate some Glyceryl oleate’s droplets and help them deposit during rinsing
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@Abdullah It depends. If you’re slightly above the pKa, you might find part of the acid protonated, and part unprotonated. The higher the pH (above pKa), the higher the amount of unprotonated acid.
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@Graillotion Because everybody cannot rule the world (sorry Tears for fears, for the terrible joke ????).
I believe it has to do with sourcing rather than a technical reason. I believe C22’s sources are less available than C16-18…and also, C22 sources might be destined preferentially to manufacture quats, since the longer the alkyl chain, the more conditioning the quat (for instance, there’s shortage now of behentrimoniums).
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@Abdullah It’ll depend on each acid’s pKa.
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@Abdullah Glyceryl oleate and EGDS are two different type of molecules; although both are esters, their molecular structure is quite different. EGDS is more hydrophobic, would not pack properly within the emulsion if being used as a surfactant/co-surfactant, and has a higher melting point. This makes EGDS being used as a suspension in shampoos for aesthetic reasons. Glyceryl oleate is more surface active, and can participate in emulsions, as surfactant or co-surfactant, depending on the type of emulsion.
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@Abdullah Since salicylic acid is an acid, you need to consider its pKa. If your pH is below SA’s pKa, then SA will be present as an acid (protonated), but if the pH is above SA’s pKa, then it will exist in its unprotonated form, that is, hydronium ions (positive) and salicylate ions (anionic), both swimming around the solution. That works for all acids.
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@Abdullah This might be a good read about the topic:
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@Abdullah You’re mixing an anionic molecule (sacicylic acid) with a cationic surfactant (arginate). I think you’d have more success if you switch the percentages of those two molecules, but I believe you have thay level of SA for a reason. Why not using an anionic surfactant? Some have a very synergistic effect with SA.
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@Chemaccounts I haven’t found much info about that ingredient, but if it’s a non neutralized carbomer, then you need to neutralize for it to function. That’s why at higher pH, your solution gets clear and viscous.
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@nmalti You coud pick a sample, and do two tests, one increasing and the other decreasing pH, to see if both viscosity and clarity improve in any of those cases.
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@zetein This is a co-polymer, and it seems to have few monomers. You can read this report: https://www.google.com/url?sa=t&source=web&rct=j&url=https://ifscc.org/wp-content/uploads/2018/05/Analysis-of-Polymers-for-Cosmetics.pdf&ved=2ahUKEwiA_dvFkof4AhXyA7kGHUF6ADEQFnoECBcQAQ&usg=AOvVaw3KHYSnajtSlHCzReq9SKJA.
Your wikipedia reference seems to be closer in naming all.
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Indeed. Arginine is a basic aminoacid with several amino groups able to get hydrogen ions from the media.
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@Anna_Maria You need to add higher dosis of sodium chloride or glutamate LT. If you want to reach the peak of your salt curve sooner, add an opposite charged surfactant as well (amphoteric or soft cationic).