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Questions related to handwash process
Hi everyone, I have been trying to formulate liquid commercial Handwash and for that all of Your suggestions were of great Help. Without your support, I would never be able to formulate this. I want to thank Each and every person on this Forum.
And now once again i am facing some questions.
Before i ask those, my formulation details are as follow :-
Aqua. 53%
Sles. 30%
Capb. 7%
Glycerin. 5%
Glycol stearate. 2%
CDEA. 2%
Tetrasodium EDTA. 0.2%
Methyl paraben and
Propyl paraben. 0.5%
Colour and purfume. Trace
Citric acid. Trace
Now the problems i am facing are :1) all the ingredients are mixed at the room temperature. However, to get the glycol stearate mixed in the solution, i need to hit up either glycol stearate seperately and rest of the mixture on the same level and then I mix both or i simply pour glycol stearate in the mixture and then hit the whole mixture .
Is that mean, the handwash making process is a hot process ? Means i really need a hit source to get the process done..?2) I want to make it an antibacterial product. And for that I only have 2 ingredients available at my location. Those are Cetrimonium bromide ( Cetrimide ) and Benzelkonium cloride ( BKC).
As both the ingredients are cationic by nature, will either of these two work in this anionic mixture ?3 ) i am adjusting the Ph at 7. What should be the optimum Ph of the solution ?
4) which EDTA should I use? Disodium or trisodium or tetrasodium.
As somwwhere i have read that Disodium works at Ph below 7 and tetrasodium works at Ph above 7.5) broofield viscometer is very expensive in india, costing arround 1.75 lakh indian rupees.
Is there any other thing arround to measure viscosity and cheaper ?Sorry for this lenghty post. But your guidance are really appreciable. Thanx
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12 Replies
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you can measure viscosity with a flow cup; it’s about the simplest method there is
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(1) Yes, and you should heat the solid past its melting point and add it to the SLES which also should be higher than the melting point.
(2) No.
(3) 5 - 6 -
your suppliers are mistaken; if you combine anionic and cationic surfactants (as you’re proposing to do) they’ll precipitate and become totally ineffective
salicylic acid works well in handwash as an anti-bacterial agent
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Thank you @ bill again. I will try Salicilic acid..☺
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@Belassi sir.. you have recommended the Ph at 5-6. As cocamidopropyl Betain changes its electrical characteristics according to Ph, will this Ph of 5-6 cause it to change into a Cationic Surfactant ?
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CAPB is amphoteric. See: http://www.eocgroup.com/content/amphoteric-surfactants
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If you want to make use of the cationic properties of a betaine, you can choose a betaine designed for the job. For instance Dehyton AB-30 has an extra cationic ion attached as compared with CAPB. Using it instead of CAPB leaves the hair softer.
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Thanx a lot Belassi sir. But, what I was asking is.. As CAPB is an amphoteric surfactant, when Ph is at 5-6, wont it be changed into a cationic Surfactant ? And if it will, then it will counteract with Anionic SLES. (As amphoterics changes characteristics according to Ph).
( if I m wrong then please pardon me, I am a Novice ).
For Cationic Conditioning, I am planning for Polyquat-7. -
Amphoterics are perfectly compatible with anionic surfactants. They adopt the charge of the prevailing surfactant.
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Thnk You so much Belassi sir, would you please explain the need to adjust Ph around 5-6 and why not at 7 ?
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