johnb
Forum Replies Created
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Precipitation of the active detergent.
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Before you go much further in this, have you considered the reaction of zinc oxide with lactic acid?
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How does the title statement relate to the question in the main text?
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The soap that bobz mentions is of very low quality and is mainly soaps of shorter chain fatty acids. The soap manufacturers I worked for had good “green” credentials even though it was several decades before the green movement became de rigueur or even known in manufacturing.
That being the case and not wishing to contaminate the environment with tonnes of waste, the nigre waste was treated with ferric chloride to form short chain ferric soaps which separated as an unpleasant orange coloured, sticky, smelly paste. This stuff had a relatively high value in being sold to steel manufacturers as an additive to the mix in making high quality specialist industrial steels.
The residual water after this process comprised sodium chloride and a small amount of glycerin which was recycled into the brine used in the soap making.
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I understand the problem as being the separation into two phases.
That being so:
1. the perfume (aroma) level is very high. 10 - 15% is nearer the norm for what is usually called an “extrait” perfume. Perfume compounds are normally completely soluble in alcohol (ethanol) of sufficient concentration.
2. I assume the missing 6% of the formulation is water. The strength of the alcohol is not stated. I think that is is simply a case of there being an excess of water in the mix.
It is rare/unknown to use solubilisers in perfumes of this high concentration of perfume compound (aroma).
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1 & 2. A confidentiality agreement (drawn up by a professional lawyer) should provide the protection you require. Indeed, it should be a sine qua non for all contracts which involve even the slightest exchange of confidential information.
3. Cannot help with that.
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Belassi - just the same with the company I worked for. A Saudi client insisted on having his perfumes made with the finest spirit and then charcoal treating them to remove the fragrance oil.
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Perry,
Not a book I’m familiar with - it wasn’t published until way after I left that sort of work. Looks to be comprehensive (there are six volumes) and, like all Marcel Dekker publications, very expensive to buy. Fortunately, an appreciable amount is available through Google Books - as you have pointed out.
Thanks!
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Why choose such an expensive oil as the main emollient?
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hasanarsan
Please be aware that this query was solved in September 2016. There is little point in you reopening the discussion. -
hasanarsan
This query was left in the charge of the originator to reply. There is little for anyone to do until that happens.
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Normally the supplier of the alcohol has grades specifically designed for use with or in fragrances.
Haute couture fragrances frequently use double distilled, charcoal treated grape spirit - although I may be a little out of date with that now.
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To me, this seems a good way of ruining the sensitive (ergo expensive) parts of analytical equipment to provide information that nobody is interested in knowing.
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This is the reverse of the norm.
The usual procedure is to have a knowledge of the chemical components required to be extracted and then to select a solvent to do this.
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Please read my previous reply - carefully!
“This can take weeks to achieve.”
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On the subject of pH meters ruined by cationic detergents, the same can happen with other detergent types as well. The detergent coats the very thin glass of the electrode and renders it effectively useless.
When I was working, I was introduced to pH meters that worked on a different principle, that is a semiconductor probe using an ISFET transistor to measure the pH.
We did buy one of these (from Sigma Aldrich) and it seemed to work OK but, I only have very limited experience in this area as I retired shortly afterwards.
A quick Gooooogle show that Amazon, both UK and US, stock Hach brand ISFET pH meters so, it may be worth a tryout.
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That mix should give a pearl effect. The magic ingredient is patience. The pearl depends on the recrystallisation of the stearic acid - which must be of high grade - similarly with the lauric acid. This can take weeks to achieve.
Why do you have LLP included in the mix?
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A book which I had forgotten about - mainly because I lost my copy - or rather it was “borrowed on a permanent basis” is:
Chemical specialties: Domestic and industrial’ by Louis Chalmers.
If it old and some of the information is completely out of date but, nevertheless, there is loads of useful information enclosed therein.
Again, it is available on Amazon marketplace.
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At a first glance, I suggest the PVPK90 is at least partially responsible for the flaking.
Try reducing it or possibly substituting with PVPK30 - or both.
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The relative proportions of the ingredients would be a help.
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There comes a point in formulation work where so many changes have been made to the product that has little or no resemblance to the original - I think you have reached that.
It should be time now to re-evaluate your whole concept and begin afresh.
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My “small molecules” comply with the accepted definiton on molecular biology of being a low molecular weight (<900 daltons) organic compound. That is to say compounds with a known and defined chemical structure and specifically excludes proteins and derivatives, MABs, etc.
They are for topical use. I have no intention of extending to other routes of administration.
Part of my development includes a novel excipient.
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Preservative Efficiency Testing is not normally carried out on cosmetic products . Single use products would normally be sterile but these are rare.
I have not heard of PET being used on, or for, cosmetic products before as they should be formulated in such a way and with sufficient preservative to allow multi-use containers to be used.
It goes without saying that all equipment and containers (yours or third party) should be clean and that is where microbial testing might be of use.
As an aside, I was part of an investigation once looking at potential sources of common microorganisms in the environment. One of the dirtiest places found (apart from obvious things like toilet bowls and seats) was the bottom of ladies handbags and purses where some quite horrendous pathogens were common (Streptococci, E coli, Pseudomonas and others). It is these things that cosmetics should be formulated to protect against and, in the main, they do.
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Did you read (and follow) the link given by Perry?
For any kind of consistency you should work by mass, not volume (which is what a teaspoon measures).
Be aware that a teaspoon of sugar weighs an awful lot more than a teaspoon of meringue - even a heaped teaspoon of meringue.