chemicalmatt
Forum Replies Created
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The NaOH was in there just to neutralize acrylates copolymer, so it goes out of the formula with that rheology additive. Problem solves itself.
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For topical use, there should be no need to buffer if your pH is in the normal skin-care range of 3.5 - 6.5. Also, you don’t need much, as it usually comes in a mannitol dispersion if memory serves. Also, cyanocobalamin will grant your product a psychedelic yellow color, just so you know. (An aside: a LOT of materials are incompatible with ascorbic acid. That’s almost a cliche’.)
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Mark, seems 99% of the regulatory scrutiny is with the ingestible product folks - many of whom are making absurd claims. This has provided us topicals manufacturers with a nifty smoke screen. Canada has not disallowed yet; and that would be very ironic if they do since that nation is poised to become the largest producer & exporter of cannabidiol in the world.
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MJL, urea decomposition is best stabilized using a lactic acid/sodium lactate buffer system at pH< 5.5. Not sure shy you would use gluconolactone there.
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I would like to know myself. Never heard of this. Castor oil is the only outlier due to its unique mid-chain hydroxyl group.
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D&C colorants are dyes, not pigments, just sayin’. I like Spectra Colors (AZ) in the USA. Good prices, nice people.
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Yup, keep the lactobacillus in your yogurt, and use 100 proof vodka to extract those botanicals instead. Much better, much easier and you can always make martinis out of the extra solvent.
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I like using the polyurethanes, dirtnap, as they provide good hold with a more natural bounce and feel to the hair. No “crunch” and certainly no flaking. These copolymers also require little plasticizing, unlike the PVP and the alkyl-modified acrylate-type fixatives, so there is more degree of freedom in formulation. Less plasticizing, harder hold. Hope this is useful.
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Answering your ORIGINAL question, Miss C, BHTC should be melted in the water phase, with mixing, while at 90C or so. Just keep mixing until melted and dispersed, add whatever oils, then cool slowly to RT. I do not recommend adding it to oil phase.
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You need a geared-drive motor, not direct drive, and 1.5hp minimum.
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Entirely different carbon chain distribution there. The homolog array makes a big difference in tactile, emulsification, fluidity. Carnauba has more higher carbon chain constituents, plus sterols, ester waxes. Feed it through a chromatograph and you’d see many more peaks than rice bran wax I’ll wager.
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Better yet, AV, make your own “black box” UV stability chamber. Get the black-light bulb from an aquarium supply store, some simple hardware and mildly crafty wood-work, paint, and voila! A light stability chamber. I do recommend testing certain products for this too: especially ones with CI colorants, botanical extracts, terpenols, etc. Not uncommon to see discoloration after a few days in the box.
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If you are filling above 45C, best to leave uncapped until they set or at least until below T < 40C. Otherwise, condensation may occur inside and one mold spore is needed to grow into a colony on the surface of your product.
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@usanutrilab, you should not need to sterilize those bottles if they came from a reliable supplier and packed intelligently. I assume your cleanser is preserved adequately.
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Don’t know about “suspension” of dimethicone, but the classic method of incorporating these into shampoo systems used for many decades is to employ a little sodium xylene sulfonate (40% is RM standard) along with a medium-high mw dimethicone, say 1000 - 10,000cst. Even better: add low mw polyquaternium-10 (JR-400) to the shampoo and your deposition will be 500% better. or, stop asking us and just read Des Goddard’s book. (How often do I have to tell people?)
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Belassi, as usual you make this forum fun, mi amigo. Forget all the above and use FCC Grade (Food Codex), cheapest, most abundant, and 100% NaCl. Iodine free too; although that would help product preservation, no?
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Check out the Cosmetic Ingredient Review (C.I.R.) stewarded by the PCPC (www.pcpc.org) and read up.
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Try looking on Equipnet.com
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DO NOT use NaOH to do this, under any circumstances. Sodium thio has a different pKb than other salts and you will cause hair to shed. Use ammonium hydroxide 28% or AMP-95. Add a little ammonium thio to buffer if you wish, but keep track of total thio assay or else bad things will happen to people’s hair.
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Check the auctions, dude. There’s where the deals are.
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Any hard surface cleaner, which includes liquid dishwash, will be best at pH>9.0 Irritation doesn’t occur until you get into the pH 12 range, remember how dilute the working liquid is. Also, cleaning criteria can be a function of pH, I do not agree with Aziz there. Saponified systems will clean MUCH better at pH 11 than at pH 8.
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BTMS - no, but other quats are, depending on what formulation you aim to accomplish. CETAC-30 and Distearyldimonium chloride are f/f liquids at RT.
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Sanek, if you were making an inverse-phase emulsion (w/o or w/Si) and applied high sheer homogenization, that is the reason it broke. Too much sheer will disrupt those formulas. You can mix well, but not too well, believe it or not.
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Stearic acid works better, at a small addition too. I’ve also used ceresin wax to harden classic glyceride soap (I know: weird, right?) How it works? I’d like to know myself. It lies in the realm of physical chemistry, not organic….
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Compatibility here should not be an issue, but as with all preservatives relying on acid dissociation, maintain a pH < 4.5 and a level of organic acid at the maximum allowed and you should have good results. Factor that into the acid content you are using to co-emulsify with that tertiary amine (lactic or citric, I assume?)