chemicalmatt
Forum Replies Created
-
Is this a trick question????? Answer: everything, including critical thinking.
-
If you are certain this is a w/Si invert emulsion then premix your fragrance oil into an ester carrier that is miscible with cyclomethicone, then add to your batch. There are several that work, C12-15 alkyl benzoate being most prominent.
-
@Mara use a phospho-ester surfactant, most of which are compatible with IPA and water and will not create too much foam or viscosity. A solvent friendly associative polymer such as Rapidgel EZ1 would be a slam dunk, but will not mist only stream. If you wanted to transition to a gel however that would be the ideal choice. As for the sticky-tacky sensorial issue, nothing will mitigate that, not with 12.0% terpene oils inside. It will be sticky and smelly, just deal with it.
-
There is only one hydrogen peroxide, none other. You do not describe the conveyance method for the peroxide, so this is a blind alley for us.
-
@rizi this is attributed to the often depicted anionic/cationic incompatibility seen so many times. You have all that amino-functional conditioning material mixed in with your primary anionic isethionate. Then there are the sodium salts to add to the maelstrom. This electrolytic chaos is kicking out EGDS and fatty amides. The guar HPTC isn’t nearly enough to stabilize this either. Also, as everyone in this blog knows my M.O. well by now: WHY add all that glycerin to a shampoo???? I am astonished this foams, builds or remains stable at all.
-
@Cherma The problem you describe is viscosity crash, not fragrance incompatibility. Premixing your fragrance will not resolve this. Your customer may be overwhelming the spatial stability with too much fragrance or uses one with a lot of phenoxyethanol or ethylhexylglycerin as fixatives, both which will crash viscosity if salt is the only builder. For this application you need to maintain viscosity with a polymer or gum resin rheology stabilizer. Acrylates copolymer, hydroxymethylcellulose, another cellulosic, the overused xanthan gum - even better a combination of one or more. This will allow your customer to add any fragrance at nearly any concentration without viscosity crash.
-
@Kristina Do you mean inside the lid of the jar, not on the lid itself, meaning atop of it? I would have no explanation for moisture vapor atop the jar lid. Inside the jar happens whenever you cap it while still hot. This low temperature condensation may be somewhat mitigated by adding to your formula more glycol or glycerin or xylitol, sorbitol, any polyol that forms a eutectic mixture with water.
-
IF this is for in vivo delivery sub-dermally you may be asking the wrong crowd. (cosmetic chemists call that “the short cut”). Having said that, do research on these delivery systems for your peptide: niosomes, liposomes (PEGylated preferred), multilamellar lipid vesicles.
-
@ruru this is not an endeavour you will do on your own. Color cosmetics are more difficult than you think. Message me and I’ll point you to a consultant chemist who is a master at this (and it is NOT me). She is widely known in our sphere assuming you are in North America.
-
As I usually do I agree with @ketchito : revise the ratio of ampho to anionic closer to 1:1 solid state and as I so very often shout into the formulator wilderness DO NOT PUT GLYCERIN INTO FOAMING/CLEANSING PRODUCTS!! Kills foam, viscosity, then goes right down the sewer. You are also guilty of addiction to Ultrez, and your surfactants are winning that battle. Switch to acrylates copolymer like Synthalen W600 and you’ll see a clear gel - that is once you’ve replaced that preservative that is giving you all the opacity.
-
I’ll agree with @Microformulation that noviconnect has come a long way from their starter point. I can say the same for Knowde; I use it more often now and it conveys a lot of intel without having to go into supplier websites and other avenues. Covalo is quite good if you are in the E.U. or elsewhere but North America. SpecialChem is simply annoying with all those pop-ups even though it draws from the most sources. The winner: UL Prospector - for the reasons Perry and Mark state. (That is until the A.I. bots come along and order me to their Formulator Re-education Camp.)
-
As @chem.ist explains: always disperse gum resins directly into room temp water first before adding any other component, then begin heating while mixing. “That’s a fact Jack.” As for your “watery” outcome, this is no surprise and you did nothing in error that I can tell. Both xanthan and tragacanth are piss-poor at thickening. A 0.50% mucilage of either will not generate more than 300 cps or so. Both gums ARE good however at contributing yield value to your formula (suspension in 3 dimensions) which is why both are primarily only used as stabilizers not thickeners.
-
@Creamycreamygel That is a lot of ethoxydiglycol there (Transcutol) which combined with all the propylene glycol may well be reducing the solubility of pentoxyfylline leading to the precipitate. I do not think it can be anything else. You should not need any more than 5.0% ethoxydiglycol to work for skin permeation. You may want to consider reducing the propylene glycol down too. Less is more here.
-
@DoreenSarvan that will turn out to be one mean hand soap (not “soup” right?) with those ingredients. Must have some very dirty hands there. Nonylphenol ethoxylates such as NP9 are no longer tolerated here in the USA but you will be able to clean many things with this stuff. I take it potassium “netroxide” is actually potassium hydroxide (KOH)? If so, solid state or the standard 38% solution? If it is the solid use approximately 1 part KOH (pre-dissolved and heated to 80 - 90C) to 3.25 parts coconut oil being sure to end up on the alkaline side like pH9.0. After that step is complete add the N9 then the others while cooling. Glycerine does nothing for this formula so feed that to the pigeons where you live. You will still need a preservative so I’d suggest getting some DMDMH & methylparaben or good ‘ol methylisothiazolinone. Peace.
-
@Shoogiegirl have you never heard of “The Seven Percent Solution”? It is the title of a Conan Doyle Sherlock Holmes novel but based on a true rule of drug chemistry: when unsure of the starting point use 7.0% and see what happens. Based on that result you’ll know whether to increase or decrease the GMS. You may also consider using GMS-S.E. since it is an emulsifier whereas GMS alone is not (it is a builder.)
-
I’ll suggest two strategies, albeit weak ones. Contact the Clariant or DSM distributor in your part of the USA (Univar I suspect) and ask about obtaining a pail quantity and expect to pay a premium for it. If it is a particularly esoteric item (like Fiflows) they will often have a partial drum in the warehouse or lab being used for samples and pilot quantities. This normally will not work for commodity items. The other is to ask that same distributor if they - or you - can contact another customer purchasing the same item regularly and if they - or you - can ask them to sell you some. That worked for me in the past where I had a tight business relationship with the distributor and a cordial one with the other party. That party was happy to part with unused inventory at a nice profit. I streamlined the process by taking care of shipping costs and pick-up, even sending them the BOL to use. The less work for them the easier to help you.
-
I would not make a paste but dissolve the SCI into water FIRST before any other material is added since that may serve as a primary emulsifier. Saves a big step there, right? Now, for the CAPB, that is trickier, you may want to add that slowly during the cool-down thermocline. CAPB is not an emulsifier but does carry free salt so don’t be too surprised if this separates then.
-
@ayat Lose that glycerin. All better now.
-
@Makoto That ingredient is supplying virtually all the yield value (suspension) to your formula and few lipid dispersible materials can match its yield value. However silica or more specifically silica dimethyl silylate offers similar but not same suspension. Processing is a bear: heating and high shear mixing for 90 minutes before adding any pigments or minerals. That is the great value of those Bentone Gels, Elementis already did the difficult job for us!
-
I’ve learned that some folks are using those same home presses for making bath bombs. Not expensive and very available (most are made in Turkey) though I have to think some modifications are needed to conform to each powder mold.
-
Nope! Transcutol (ethoxydiglycol) is there as a glycol ether penetrating agent, also a nifty solvent, but has no surfactant properties. You will need either an alkali hydroxide to combine with all that oleic acid to form a soap or get rid of it altogether. Ethoxydiglycol is a nifty solvent as stated before plus the ethanol should help. Add a little water-soluble acid (lactic acid) to aid solvation with all those amino groups. This may not be creamy but will be a jelly.
-
@oldman20 Are you attempting to make a stainless steel surface cleaner here? Sounds like it. Forget the NaCl vector, it will not help. Oxalic acid alone works well; beefed up with phosphoric even better.
-
@iEngineerG Both of these metal stearates are often used to thicken oil mixtures, why we call them “oil soaps” sometimes. In pressed powders I believe their function is to act as binders, keeping those powders together. The sensorial aspect you perceive may be related to other components in the formulations but is still worthy of further discussion. If I knew more about color cosmetics I would start a thread here but that is one of my weak spots. #colorcosmetics
-
<div>@cosscin Sometimes you can get these “starter workshops” for free if you know where to look. Peruse LinkedIn under hashtags like #cosmeticscience and you will find a wealth of tutorials. Here is one of mine recently re-edited and reposted as example. </div>
Formulation Chemistry: Crafting the Perfect Styling Gel with Great Curl Retention - 3V Sigma USA
3vsigmausa.com
Formulation Chemistry: Crafting the Perfect Styling Gel with Great Curl Retention - 3V Sigma USA
Join 3V Sigma USA in the applications lab to learn how to make a clear hair gel with superior hold and curl retention.
-
@Shaghayegh Rapidgel EZ1 will thicken glycol systems but you will need a very small amount of water (2.0%) to activate it and achieve a clear gel otherwise you’ll need to mix all day.