belassi
Forum Replies Created
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I put the beaker on low heat and evaporated the solution leaving a mass of pale-straw coloured crystals. The mass corresponds to that expected.
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Hang on - by “sorbitol esters” they mean polysorbate. That is an emulsifier but high HLB only, so it is not, in my opinion, a well designed product.
And they are trying to conceal the fact that it almost certainly contains parabens by using the Lonicera Caprifolium (honeysuckle) Flower (and) Lonicera Japonica (Japanese Honeysuckle) Flower Extract description. -
Since it is insoluble in oils, why are you adding it? I can’t see the combination working. Tocopherol would be a better choice, I believe.
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There is no emulsifier listed. “Ammonium salt” is not a correct INCI name. Probably they mean ammonium chloride.
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I don’t really need the solid form, but I do need to know if my procedure is correct. I can’t find anything on the Web. Only about using KOH to produce DPG from ammonium gl. A replacement reaction by the sound of it.
I guess if I allow for the fact that my acid is 95% pure, adjusting the mol mass by dividing by 0.95 … and I accurately weigh the predicted masses … and accurately determine how much acid/base is needed to produce pH=7, then if it comes close to neutral straight away, I should have DPG. I think. -
Johnb: Do you think I will be able to convert the pure acid to the potassium salt? Would it be as simple as reacting it with potassium hydroxide using 1 mol to 1 mol?
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Elise thanks for that. Heaven knows how I’m going to obtain that in Mexico…
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The PEG-7 GC really is just a refattener in this formula, and maybe a solubiliser for the distearate. Basically, to adjust the formula, you need to add or subtract electrolytes, in this case, salt.
There is a (quite steep) salt curve of salt vs viscosity. It appears that your particular combination has hit it right on the nail. If you want to reduce the viscosity, I suggest first you reduce the amount of CDEA by 0.5% at a time until you achieve the desired result. Do this by means of preparing a batch without the CDEA. Test the viscosity. If you need it thicker, you can either add sodium chloride or CDEA. You add it progressively until you get the required viscosity and record the amount added for future reference. -
Hey Bill thanks for that. I already buy Kao products, I use RLM-45CA which is a wonderful surfactant. I will ask my rep if they stock it. Stepan or Evonik, I don’t think so. I’m not keen on messing with the formula, it took me about 18 months of development time and a lot of wasted material and a lot of reading books and Web articles.
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I’m in Mexico, I’d have to import it from them.
I might try a test batch with Plantapon LGC sorb, I have some of that in the lab. -
It’s all about the salt curve. The CDEA and betaine are the thickeners.
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If the blend is salt-thickening, I would have thought the obvious thing would be to carefully increase the salt level so as to take it past the peak of the curve and into less viscosity. Or alternatively add / increase CDEA content.
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Both people work outdoors around various chemicals, one is a farmer and the other is in a vineyard
Farming chemicals are horrendous compared to what’s in cosmetics -
Ah! Right. Thank you.
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I will say just one phrase, absolutely essential:
Test Marketing. -
To make a clear solution it is necessary to use a solubiliser such as hydrogenated castor oil, polysorbate 20, PEG-7 glyceryl cocoate.
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Green tea is an indicator. The colour will depend on the pH. For instance, at a use level of 0.2% (dried tea extract) in a hand cream, we get green-brown initially (pH basic) then pink when adjusted to pH = 5.5, then after some time it turns to a tan colour (oxidation I assume).
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So you’re allergic also to soft drinks such as Coke and Pepsi?
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My personal view is that I leave this kind of product to big companies. Why? Because they can afford the legal costs if/when they get sued.
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What is the purpose of that idea? I regard separation as a failed product.
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No one can say if this formula is correct. It is necessary to make it and test it. As @johnb noted. Do you understand the term “salt curve”? Know about micelles and their structures?
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Choice of preservative depends on many factors, not least the availability in your market. Using sodium benzoate at 0.5% is generally sufficient but the pH must be 5 or less.
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Formalin? Are you serious? That’s a banned substance.
There is insufficient surfactant. -
It wasn’t just citric acid by the way. I have to tell myself to avoid getting fixated on things. I also experimented with a variety of other things to “improve” cold process soap. Such as, cocamide MEA. Higher foaming, I thought. And yes, a bit; but at the expense of having a waxy texture which wasn’t very pleasant. In the end I concluded that I should take the step of learning how synthetic surfactants work, and leave the soap alone, it’s as good as it can be.
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Excel!