Abstract
1. A procedure has been developed for evaluating the emulsibility of oils in the process of recirculation, applicable to oil operating conditions in the lubrication systems of paper-making machines and rolling mills. 2. The demulsibility of oils containing EP additives depends to a great extent on the nature of the additives used. When an oil is recirculated with continuous entry of water, the demulsibility improves, reaching a maximum that is characterized by a nearly constant value of the relative amount of water draw-off. 3. It has been found that contact with water decreases the EP properties of oils in the majority of cases, and increases the amount of corrosion. These trends are exhibited to the least extent by oils with sulfur-containing additives and to the greatest extent by those with chlorine-containing additives, owing to hydrolysis of the latter in the presence of moisture. 4. A number of additives and formulations have been investigated; of these, the most suitable for use in lubrication systems subject to water contamination proved to be the EP additive OTP (sulfurized propylene tetramer).
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