ketchito
Forum Replies Created
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Cationic polymers and cationic surfactants react differently to the pressence of inorganic salts. For instance, negative ions would hinder expansion of cationic polymers, while emulsions based on cationic surfactants could experience an increase in phase transition in the presence of inorganic salts, but that depends on the system and the amount of salt. There are few papers on the topic. Just as a curiosity, I found yesterday a patent from UL for a conditioner, and they were using 0.2% of an inorganic salt.
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Did you try the same formula without Zinc ricinoleate? I see you’re using lavender essential oil at high dose, so I’d think has more chances to cause thebissues than Zinc ricinoleate.
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It’s normal for chromophores to absorb radiation and have a change in color. If that’s your situation, then a water soluble UV filter is needed. But again, there are different reasons to color change, so chek properly which one that is.
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If it happens right away, then UV is not to blame; but if it happens gradually or only in a UV chamber and your package is transparent, then you need a UV filter.
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Besides the alcohol you mentioned in your formula, are you using ethanol or any other alcohol? That can reduce arbutin solubility.
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Suppliers don’t necessarily follow the LGN model when making those blends, they might just want to ensure more final consistency, disregarding the fact that excess fatty alcohol would crystalize in an unstable conformation within the emulsion.
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It’s probably the pearlizer. Liquid systems don’t usually have a pearlizer since there’s nothing to suspend it. Can you remove it?
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If the blade diameter is very small compared to the tanks diameter, you’ll get lower mixing energy transfer and batch turnover (BTO), and that can also account for the lower viscosity. If that’s the case, you can use both an external pump to recirculate during the emulsion, and also a planetary mixer (if your tank has one) along with your turbine. This is specially useful when the emulsion gets thicker.
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I’ve seen that happening many times. When scaling up, you need to keep more or less the same cooling rate, heat and mixing energy as in the lab. For what I see, the cooling rate is clearly not proportional, so crystalization profile (and final viscosity) will be diferent. Also, what’s the ratio of blade diameter/tank diameter in your reactor compared to the lab?
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It can actually be many things. Fragrance oxidation is a possibility, but if it happens in all variants, then it’s not that. Dyes are pH sensitive, so check the pH of your product. The last one is UV radiation, for which products in transparent bottles usually have a UV filter like benzophenone-4.
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I’m not sure you’ll get the effect you want (niacinamide is water soluble, so an anhydrous product is not the best delivery system for niacinamide). What’s the effect you’re trying to get?
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I agree with @Fehker, reduce CAPB a bit. Also, your BTMS could impact your foaming, so perhaps you could make a sample replacing BTMS with SCI, just to compare.
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In a water-based system, you don’t solubilize the silicone but rather stabilize it by making an emulsion. If you have residues, then either increase your emulsifier or change it….or use an emulsified silicone instead.
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Hi! Sorry for the late reply. I believe it depends. If you want to reduce damage due to free radicals formation and you use Tinogard in a leave-on product, then that’s possible. I remember a paper from P&G where they showed how protection from oxidative stress using a tropical product could even improve anchoring of hair. Now, you need to use it in the right product, so the media where free radicals would form is the same, and they can interact. Now, if you mean UV damage (because of absorption and bond cleavage), then you might need more than what’s usually recommended by the manufacturer (which is 0.1%), and better pair it with a molecule whose main action if UV absorption).
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Do you have any electrolyte in yoir formula?
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Just in case, Triclosan has been banned in the USA as antibacterial agent in soaps, so be careful about that.
Regarding the grease removal, are you using a 27% or 70% version of your SLES. If it’s the 27% version, you definitely need to significantly increase its level. If it’s the 70%, you could increase your SLS up to 1%.
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Just for context, EPA has in its website an entry where they made comments to the safety reviews they conducted on DEET: https://www.epa.gov/insect-repellents/deet
Also, there is some info about insect repellants that use actives not registred by EPA (mostly natural oils), that don’t pose a risk for humans, but whose effectiveness hasn’t been evaluated: https://www.epa.gov/insect-repellents/regulation-skin-applied-repellents. Effectiveness evaluation is a very thorough, complex, lenghty and expensive process, but it makes sure that an active really delivers its performance because the outcome when it doesn’t is the exposure of people to very severe conditions.
epa.gov
DEET (chemical name, N,N-diethyl-meta-toluamide) is the active ingredient in many insect repellent products. It is widely used to repel biting pests such as mosquitoes and ticks. Formulations registered for direct skin application contain 4% to 100% DEET.
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What’s the level of you non ionic surfactant in your formula? For dilute products it’s not that high, so perhaps you’re formulating a concentrated product.
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The phenomena you describe about clarity and temperature is common for some non ionic surfactants.
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If you take out the fragrance and the yellowing is gone, then the fragrance is oxidizing. For that, I’d add Tinogard TL premixed with the fragrance (between 0.05-0.10%).
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To @PhilGeis point, the formation of scum from soaps is a very well documented phenomena. Not only because of the physical residues, but because unlike sodium/potassium soaps which have foaming properties (not comparable to sulfates or sulfonates, but that’s a different story), calcium soaps are know defoamers. I attached a book image for rerefence. And for soaps, it’s not hard to form calcium salts, especially in cities with high levels of hard water and in the absence of a robust chelating system.
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You can check this paper:
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TiO2 is not water soluble, so it won’t help. Instead, you could use something like benzophenone-4. Also, add some chelant just to be safe. But again, if the issue comes from an stability in your formula, then that’s a different story. You should check at the rate of color change.
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The oldest one Dr Goddard (the father of coacervation) and later P&G used and studied: polyquaternium-10. It’s been widely researched for decades, especially coacervates with SLS and SLES.
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Put in the oven samples without the issue, and check if they also become turbid.
And just in case, always premix your fragrance with your non ionic surfactant before adding it to the batch.