slothm Aug 6, 2015:

Why a water and oil stable dispersion?
Water cools the cutting edge due to very high temperatures that arise during operation.
The oil lubricates.
The presence of very reactive surfaces during operation and high temperatures have a catalytic affect on natural oils so petroleum derivates are used instead as is the case in question, they will not degrade into glycerine and fatty acidas.
Fatty acids corrode.
Ever tasted rancid butter?

Neil Ashby Aug 6, 2015:

What relevance does any of the above have????????? Why are you banging on about water dispersions???? A water dispersion (or o/w emulsion as you proposed) WOULD NOT BE USED as a heavy duty machine oil - THAT'S MY POINT FROM THE START.

The fact remains: a water continuous phase would not be used for lubrication - full stop.

Well done, you're amateur science has dazzled the asker into believing your convincing 5 confidence when really your logic behind the suggestion is errant.

I don't care how many ways there are to prepare a water dispersion (opening the tap and getting a cup of water is one!!!!), that's totally irrelevant here - why don't you just admit your mistake? IN NO WAY WOULD AN OIL-in-WATER EMULSION BE USED!! But rather than admit that error you tried to cover it by turning it into "water droplets are enclosed in an oil covering" and now by addressing my condascendingly with a load of irrevelant drivel in attempts to draw attention away from your mistake. Be a man, admit it. You'll feel better afterwards.

"Polarity of the contact inner surfaces is vital,"?? - BS in emulsion chemistry, but I imagine you mean "that the interfacial contact angle is vital". Or please explain what a "contact inner surface" is?

slothm Aug 5, 2015:

Neil. An emulsion is not the only way to formulate a water dispersion.
Polarity of the contact inner surfaces is vital, please do not deny that fact.
If not, say goodby to Van der Waals forces.

slothm Aug 5, 2015:

Neil, Neil, Neil... As a matter of fact, whilst paid researching for types of water dispersible formulations for tick control, a 3 months effort, these are the results,
1. multiple emulsions
2. hydrodispersible grains
3. microemulsions
4. microencapsulated
5. dispersible solids
6. suspoemulsioins
7. oil dispersions
8. hydrodispersible dusts
9. water dispersions
etc.

Neil Ashby Aug 5, 2015:

Hi Slothm I've never seen an emulsion described as PNP (presumably that is supposed to represent "polar-nonpolar-polar" which would actually be a multiple emulsion, w/o/w) or NPN; it simply is not the terminology used in emulsion chemistry.

You have stated in your description that "son mezclas complejas de grasas y aceites dispersadas en agua." This is equal to an oil-in-water (o/w) emulsion, that is, oil drops dispersed in a continuous aqueous phase. As I mentioned, that would be counterintuitive for a machine oil, to have an aqueous continuous phase in contact with the metal parts, not providing the properties of the oil in terms of viscosity, compressive strength, thermal properties, etc. but rather coating the machined parts with non-viscous water, thereby producing corrosion.
This changes into "in this case water droplets are enclosed in an oil covering.", without any admission of an error in your main explanation where your reasoning falls on its face. Just brushed under the carpet.
Besides, isn't glycerine non-offensive, so it wouldn't cause any problem in the tank.