ketchito
Forum Replies Created
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Then there’s something wrong with your pearlizer or the process. Your pearlizer shouldn’t interfere with the viscosity, since what should happen is that it crystalizes out of the solution, hence, no interacion should happen. Another chance is that you make a pear premix with water and surfactant, let it cool, and then add it to the rest of the bulk. You could also use a ready-made cold processable pearlizer.
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Ok. Can you try with only 1%, instead of 2%?
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Usually, you need to cool down slowly for crystals to properly form. How are you doing your cooling down process?
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What’s your manufacturing method (order of addition, mixing speed, heating, time, etc.), and which equipment are you using to make the product?
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I’d still make a sample with SLES instead you your coco sulfate, only to see i it’s the kraft point or not🤓
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I would start with 0.1%. Increase if needed, little by little.
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There’s no reason for having so much panthenol (very water soluble) in a rinse-off product. Same goes for the glycerin which not only doesn’t perform in a rinse-off formula, it won’t let you build viscosity and will impair foam. Use no more than 0.5% of both. Also, salt additions should be done gradually (for instance, increments of 0.2%).
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What’s the pH of your system?
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Could you remove both Glyceryl laurate and your cellulose (HPMC)?
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If you need to anyway raise the pH of your chitosan solution, perhaps a small addition of an inorganic salt could reduce inter and intramolecular interactions that produce the hydrogel to swell. Try first with a small amount of a monovalent salt.
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That doesn’t seem like a formula for an insect repellent. You can check in EPA’s website for similar products, what active they are using and at which level.
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As mentioned by other members, reduce the allantoin. Nevertheless, I understand that in few attempts you removed allantoing without solving the issue. It could actually be due to the kraft point of your system. Could you replace your cocosulfate with SLES? If that doesn’t work, perhaps remove the HEC (sometimes it doesn’t get along with glucosides).
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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’ve seen phase separation happening in emulsions with cellulosic thickeners, so ai recommend to make a test without it; in fact, I was checking similar formulas from Beiersdors and Unilever, and they don’t seem to have a thickener, since the film required for a roll-on is easily achievable through a proper mix of emulsifiers.
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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.