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Shampoo Batch Problems
Ingredients:
Sodium Cocoyl
Isethionate- 10%PQ7 - 1% Citric Acid- 0.10% Panthenol - 0.50% Potassium Sorbate - 0.30% Cocamidopropyl betaine- 10% Cocamide DEA
Peppermint oil .1%
Eucalyptus oil .1%I added all liquids to water phase at 75 C. Cooled down the mixture and added the essential oils at 45 C. The mixture turned out noticeably thin and somewhat slimy. Also, some sediments remained in the mixture, which makes me think I did not mix it properly. Any advice to adjust the viscosity and slimy texture?
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12 Replies
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Use a solubilizer for the oils (like polysorbate 20 or 80) Premix the oils with the solubilizer before adding to the batch.
You can do a salt curve analysis to see how salt levels and pH affect rheology.
https://chemistscorner.com/salt-curve-analysis-how-to-control-cleansing-cosmetics/ -
If you notice a cloud effect after adding the oils than you should use polysorbate 20 as a solubilizer (as Perry said). From what I have red in the past, it is recommended to use the solubilizer at the same percentage as your oils.
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@Perry As for the thin viscosity, would you recommend I just q.s. NaCl
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Sodium cocoyl isethionate is generally recommended for syndet bars and opaque formulations (although when used in low amounts can be used in clear formulations).
You would probably get better results with Sodium Lauroyl Methyl Isethionate instead or try combining the SCI with another anionic surfactant.
Does your SCI contain stearic acid? This could be the reason for the sediment.
Also Cocamide DEA is now classified as a possible human carcinogen (https://monographs.iarc.fr/ENG/Monographs/vol101/mono101-005.pdf) so I would remove it or replace Cocamide MEA.
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Thanks Ozgirl, although I haven’t formulated with CDEA for a long while, you just encouraged me to get rid of the remainder. There is only a few Kg left, how should I dispose of it? Landfill, in its container, or flush down the drain with a lot of water?
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@Belassi don’t throw it away, make car shampoo or something like that. Flushing is a really bad idea, you can clog the drain unless you predisperse it on hot water.
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Car shampoo? OMG do I have to learn how to make shampoo for cars now… now there’s a thought. My new range… the jet black pomade for Mercedes owners, Ford of course will be the beige shampoo.
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@przemekp - Yes, NaCl is a suitable salt for most systems.
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@Belassi and of course, you have to make sure it kills the Hungarian car-eating muppet
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That is creepy
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If you want to use SCI with Chembetaine, try to avoid using them in the same %, you may use them in the ratio (not the %): SCI:CHEMBETAINE 1:5 which means you may use 4% SCI to 20% Chembetaine.
Try to avoid heating all the surfactants to 75C. I know that SCI may give you hard time to dissolve or partially emulsify if its blend has stearic acid. you may heat it with chembetaine at 50 - 60 till complete dissolution (it may take a while. You need to wait). The slimy appearance and the sediment you noticed in your batch could be due to undissolved SCI. For PQ7 (Polyquaternium 7), try to use it between 2% - 5% and add it to water before adding the rest of the surfactants
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Hi guys,
This forum is so great for learning!
I received some samples of thses anionic surfactants; Sodium Cocoyl Glutamate, Sodium Cocoyl Glycinate and Sodium Cocoyl Isethionate. Maybe a stupid question but may I add these anionic surfactants to my shampoo base which contains Lauryl & Decyl Glucoside (I think this is no problem since these are non-ionics and are then compatible with anionics) but what if I have the amphoteric Cocamidopropyl Betaine at ph 5,50 in my base? Will this amphoteric acting as a Cationic in my acidic shampoo will be unstable if these new anionics be added?
Thanks for your insights!
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