chemicalmatt
Forum Replies Created
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Yup, 4.0% is the monograph level for surgical scrub, so what state of “reasonable” are you looking for? From start, I cannot fathom what utility glycerol does at 0.02% w/v. DELETE it. The concentration of primary surfactant is way low. Your builder Ammonyx LO is OK (1.33% solids there) but the APG (compatible) at only 1.0% solids (50% solution correct) is not providing much in way of cleansing is it? Triple that material.
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Do you mean AMP-Acrylates/ XXX copolymer or crosspolymer? That is a family of rheological polymers, not a specific one. e.g. Rapidgel EZ1 (3V Sigma) is AMP-Acrylates/Isodecanoate Crosspolymer (& PEG-6). There are others too. AMP is there as a neutralizing amine.
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Disodium EDTA has a decently good formation constant for Fe++ in that pH range. Tetrasodium EDTA does not.
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That subnatant (bottom layer) is likely Polyquaternium-7 as you suspected. The whitish stuff may be the sodium PCA complexing with PQ-7 and salting out somehow. Rid yourself of the PCA or reduce it to a negligible level. Then again that cloud may just be fragrance or vitamin E unsolvated. If you are using more than 5.0% PQ-7 (standard 10% active) and do not have a decent level of hydrotrope - and CAPB is the only one I see here - the PQ-7 will salt out, actually “gel out” as you’ve observed, to bottom, as you reduce pH. Those “droplets” are likely from the Sorbithix. Without numbers though consider this only a guess.
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Usually a little slimy-ness in a conditioning shampoo with PQ10 is a good thing: means you are getting favorable cationic sensorial deposit on dilution. Having said that, you may be facing an order of addition problem or that polyricinoleate builder is the culprit. Always disperse & completely hydrate PQ-10 into the water first, then add the amphoterics immediately afterwards - and you have two there. Anionic surfactant next then any builders. This way you optimize coaceravation of the PQ-10. As for that polyricinoleate builder, switch it out for another builder such as an amide and observe any difference in “slime.”
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@Abdullah you have me there. I can only guess how much acid is in lemon juice squeezed. Probably more than I know.
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This material will be largely lecithin, similar to soy “foots”. Phosphatidyl choline and phosphatidyl serine mainly. I am curious as to how the brand can name or use that INCI, but when you are Estee I suppose you can do a lot of things other manufacturers can’t.
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If it is FCC grade citric the answer is yes. How much? Depends upon your acid reflux tolerance.
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If using standard TEA 85%, then use 1.4 : 1.0 carbomer, but since you asked what I really think then save yourself a lot of money and time by DELETING the TEA and Carbopol 940 altogether and switch to Rapidgel EZ1 from 3V Sigma.
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…or you may just disconnect from Evonik and use Monolaurin from Colonial Chemical (glyceryl laurate), which is doing all the heavy lifting there.
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Outstanding idea there @Rimbaud16: good old DOSS, the HI&I formulator’s best friend for decades. Kudos to you for thinking outside the box. Makes one think of all those Gemini surfactants used in HI&I that personal care formulators continue to ignore. A bit heavier on the irritation index, but that is easily resolved in formulation.
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@Hanson25 : much easier, use Synthalen W600 (acrylates copolymer) at pH 5.5 - 6.5. Liquid drops right in and then throw in any sulfate-free surfactant you want in there, just go easy on the amphoteric.
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I’ll chime in with another (larger perhaps?) aspect of this data. The continuing inability of so many “softer” preservatives to suppress fungi & molds. So many tools to address bacteria and their phages, but fungi go on and on and on. One longs for parabens…or at least IPBC!
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You are describing AccessGEL LEDO (Access Ingr.) at 100%.
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This may sound weird but you might try rice starch as a bulking agent and whitening opacifier sub for TiO2. It is inexpensive, and absorbs oils so that may lead to further weirdness - or total success.
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@BigDreams Try the PG-4 Oleate, and should they offer PG-6 oleate, even better. That latter one matches up well with the PG olive oil ester.
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ghtc? galfusion? poly 7? cucumber glycerite? aloe extract?
This does not compute. -
Start out at 1.00% and test the result. You will have difficulty hydrating more than 2.00% of PQ10 30M, so there is your upper limit.
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Negative. They are pearlizers that do little to deposit silicones from conditioning shampoo formulations. Dilution-deposition coacervate formulation assisted by sodium xylene sulfate as hydrotrope is the “classic” method there.
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For the record, the only meaningful regulation that EPA exerts over cleaning products is when they apply to FIFRA or SaferChoice (DfE) compounding. Otherwise you can put all the phenoxyethanol you want in there. I assume you are formulating disinfectant then? That being the case I’ll echo Dr. Phil and state it as a solvent, which it in fact is.
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By “HMC” did you mean hydroxymethylcellulose? These D.I.Y. abbreviations drive me O.O.M.M.
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That is the standard commercial concentration, determined many years ago by partial pressure equilibria calculations of volatiles. Same holds true with standard ammonia concentration (26Be if I recall?), etc., etc.
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Not at all objectionable. Just do the dilution algebra and q.s. with IPA and water to avoid ppt. and you should be OK. IPA certainly will aid the antiseptic cause too, right?
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This topic has been under discussion for decades now, but my opinion - and the consensus - is that 350cst dimethicone will be the most versatile used for skin care applications, with 100cst the second runner-up. Nothing heavier or lighter such as DM6. Also my opinion here only: nothing matches the attributes of dimethicones. The light esters you note, and CCC is a good one, have a different sensorial outcome and most all of the commercial “silicone substitute” light esters are analogs for cyclomethicone, the least practical of all silicone emollients. D5 cyclics in antiperspirants and hair-care de-frizzers: another story altogether. Indispensable there.
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You might give the polyglyceryl esters a try, such as Emulsiderm PGEO. Most surfactants will agglomerate the powders depending on what you have inthere.