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Sharing any knowledge about emulsion
I will share some information about emulsion and I want to know more and more about it so please share any information :
1) making the same formulation of cream : just changing (cetearyl alcohol to cetyl palmitate to stearic acid) “with same level”
*As result, the formulation with cetearyl alcohol is the best for viscosity and texture.
*Stearic Acid gives very near viscosity but with lower texture (lower smoothing)
*Cetyl palmitate gives too thin emulsion.
I guess may a combination will give better results? Any one try to make some combinations and compare with cetearyl alcohol alone (it needs a lot of work the combination and synergy. I will do it when I collect more information and find time…)
2) For required hlb, i find always two groups, one says it is not important and another says it is . Personally I’am with the group who says it is not important because with same oils and level changing the hlb of my emulsfiers I did not get really important challenges. Or maybe I get better result when decreasing the hlb of emulsfiers comparing to required one, any add or comment?
3) when using cetearyl alcohol in emulsion, its level will be calculated as emulsfier, oil or no one?
As exemple if we have 5% cetearyl alcohol, 10 % oils, 5% emulsfier so
* the total amount of emulsfier is 10% and 10% oils
* the total amount of emulsfier is 5% and 15% oils
* the total amount of emulsfier is 5% and 10% oils.
4) I read a lot about the effect of mixing speed to emulsion’s viscosity. Almost it says that increasing the speed will increase the viscosity of emulsion however in practice in my case the rule wasn’t true. (maybe because of shear rate parameter?) Any experienced expert tell us and especially explain the effect of shear rate and speed mixing to the emulsion’s viscosity ?
5) Always we talk about noewax 165 as from best emulsfier, however my experience shows that it has not good resistance versus Sensicare c1060 because adding this preservative makes an important drop in viscosity to emulsion . Anyone have similar experience?
@Abdullah @Aniela @Perry44 @Paprik @chemicalmatt @Cafe33 @ozgirl @ketchito @Graillotion @PhilGeis @Pharma @ngarayeva001
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12 Replies
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2. not important
3. As emulsifier when used with another emulsifier
4. First high speed then slow speed
5. Yes phenoxy reduces viscosity
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4- when , how much time and which speed ( for high and low speed) ?
5- Yes Phenoxyethanol reduce viscosity and maybe sensicare c 1060 reduce more this is the first point and second the drop of viscosity is more important using neowax 165 then other emulsifiers .
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This reply was modified 1 month ago by Fekher.
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for 3) supposed to calculate required hlb , you will not calculate the required hlb of cetearyl alcohol?
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4. At first high speed, time depends on batch size. Sample size 1-2 minutes. Then slow mix. No need high shear mix
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Actually in 300 kg batch , have you suggestion about time ? i guess even in laboratory it needs more than 2 min then (high , slow) speed can you translate to rpm/min ?
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Time would be more depending on temperature, viscosity and homogenizer size. It would be much more than 2 minutes.
I dont count rpm, so lower is better. Maybe 100rpm
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too slow 100 rpm for emulsion it should be more .
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This reply was modified 1 month ago by Fekher.
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This reply was modified 1 month ago by
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This reply was modified 1 month ago by
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I’ve been doing some reading on the use of HLD (Hydrophilic Lipophilic Difference) instead of HLB. I’m about halfway through the book and it points out the flaws of HLB and how HLD could be used to fill in the gaps if you have the right information. Even if you don’t have the information to plug into HLD, the theory in the book is useful and would answer some of your questions.
https://www.stevenabbott.co.uk/practical-surfactants/the-book.php
stevenabbott.co.uk
The Book | Practical Surfactants Science | Prof Steven Abbott
Surfactant Science: Principles and Practice free eBook
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Any share or link?
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The link to the book is on the page linked in my original message, it’s free and open to the public. Here’s the link to the pdf.
https://www.stevenabbott.co.uk/_downloads/Surfactant%20Science%20Principles%20and%20Practice.pdf
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thanks
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You’re welcome
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