One of the method which can be used as an anti foam is the synergism of PEG with an anionic or cationic surfactant. Can this synergism compete with silicon based anti foams?
"Foam Behaviour of An Aqueous Solution of Piperazine-N-Methyldiethanolamine (MDEA) Blend as A Function of The Type of Impurities and Concentrations"
i propuse this article to read.
i have not read this article yet but some refrences mentioned to this article . this article says: PEG 400 is big molecule and maybe it's big structre denies bubbles to gathering and so make a foam structure.
i have found PEG400 properties . it's HLB is 19.8. and water soluble. equilibrium surface tension is 44.5 . with this properties , at first sight therse is no way to antifoaming behaviour of this surfactant. but as some refrences said, it's big structure plays an important role.
if you read this article, can you share with me it's highlights?
sincerely
motamed
In our lab, we prepared many foams based on formulations containing PEG of various molecular weights. All the foams were quite nice, and we never observed that these chemicals prevented foaming. Hope it helps.
Alain
Okay, let me clarify something for you. you couldn't put both cationic and anionic surfactants together unless you're using amphoteric surfactant, but you can use nonionic surfactant with one of them. Anti-foam effect usually when combing PEG with Cationic surfactant and this synergistic effect under the control of pH, temp., and quantity of both agents. Indeed! silicone based antifoams are helpful in some cases with PEG but in other cases, useless or to be more accurate, no change in foaming properties could be identified.
Kindly check my last publication on International Journal of Applied Cosmetology.
After this time, do you know the answer to your question now? If this is the case, please share this answer with me.
Wishing for success
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