Aristoflex AVC causes too many air bubbles

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Aristoflex AVC causes too many air bubbles

Posted by ngarayeva001 on August 16, 2018 at 9:13 pm

Hello All,

I finally received long-desired Aristoflex AVC aka Ammonium Acryloyldimethyltaurate/VP Copolymer and faced a problem. Lotions made with this polymer contain too many air bubbles. I have never had this problem with other polymers. Unfortunately, I don’t have a good mixer and use a generic stick blender. Is there anything that can be done (except for buying a professional mixer) to fix this problem?

I am not posting the formula since the lotion made with exactly the same ingredients but different polymer does not contain bubbles (or minor bubbles).

Thank you in advance

ngarayeva001 replied 5 years, 8 months ago 4 Members · 11 Replies
11 Replies

DrAndrewWorthen

Member
August 17, 2018 at 12:41 am

This sounds like it could be either a surface tension issue, a non-Newtonian viscosity effect at low shear, or both. If you can’t prevent the bubbles in the first place, have you considered post-processing steps to remove the bubbles?
ngarayeva001

Member
August 17, 2018 at 3:00 am

@DrAndrewWorthen is there anything that can be done post-process without special equipment ?
ngarayeva001

Member
August 17, 2018 at 3:13 am

I use a hot process. Aristoflex is added to the oil phase. The oil phase also contains glyceryl stearate and PEG 100, cetearyl alcohol, cetyl alcohol, oils and silicones. Again the same ingredients and method works for Sepinov EMT. Aristoflex tends to form air bubbles even when aquanous gel is prepared with minimum mixing.
ZivBA

Member
August 22, 2018 at 9:46 am

I have a product in the European market, which contain the Aristoflex AVC, Aerosol Body Lotion. Viscosity around the 1,000-3,000 cp.

I’m adding it after emulsification, when it’s still hot, so the majority of the homogenization is without the Aristoflex.

Maybe it can help you reduce the air trapped in the lotion.
ngarayeva001

Member
August 22, 2018 at 8:37 pm

@ZivBA, thank you. Do you hydrate it first or add as a powder? If the latter, how do you mix it?
Microformulation

Member
August 22, 2018 at 8:49 pm

I have found that by selecting the proper mixing blade and the proper speed (minimize aeration), you can practically eliminate this aeration issue.
ngarayeva001

Member
August 22, 2018 at 8:54 pm

@Microformulation unfortunately for me, I don’t have a proper mixer. I am looking up cheap options now. In fact bubbles are always a problem, aristoflex is just much worse that other polymers.
Microformulation

Member
August 22, 2018 at 8:56 pm

It is a case where the process (procedure with proper equipment) is crucial. If there is an upside, I have seen that it is much less an issue in larger manufacturing batches.

So, it will be a challenge until you invest in the proper blade and ensure you have a good overhead variable speed mixer.
ngarayeva001

Member
August 22, 2018 at 9:04 pm

Thank you @Microformulation, that what I was thinking.
ZivBA

Member
August 27, 2018 at 7:11 am

ngarayeva001 - As powder pure it into the vortex,

Minimal homogenization- if needed.

It wont take all the out, it will minimize it…..
ngarayeva001

Member
August 28, 2018 at 9:51 pm

Thank you @ZivBA