WETTING POWER IN SODIUM-SOAP—MINERAL-OIL SYSTEMS

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Abstract
Measurement of the contact angle of various mineral oils on surfaces of sodium soaps showed no appreciable variation with oils of varying polarity. Low V.I. oils show a lower interfacial tension against water, and greater emulsion stability. Mineral oils possess high spreading power on soap surfaces previously wet with glycerol. As a result, mineral oils are rapidly absorbed by a soap-glycerol gel, and at the same time the glycerol is displaced and forced out of the gel. Data are shown for some quantitative measurements of this preferential wetting action, various oils and elevated temperatures being used. These experiments are extended to sodium soap base lubricating greases, and the presence of free glycerol is demonstrated in such systems where fats were used in the manufacture of the grease.

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