INFLUENCE OF CHEMICAL COMPOSITION OF SUCCINIMIDE ADDITIVES ON ANTISCORING PROPERTIES OF MOTOR OILS.

Derivatives of alkenylsuccinic acids, i. e. , succinimides, are used widely as detergent and dispersant additives for motor oils in modern engines. These additives, which improve the oil detergency and dispersancy, prevent the deposition of sludge in the engine crankcase. The succinimides also affect the antiscoring properties of the oils, but here the effect is adverse. In order to eliminate this shortcoming, various modifications of succinimide additives have been synthesized. The resulting additives have not only good detergency and dispersancy, but also good antiscoring and anticorrosion properties. Materials introduced into the additive composition for this purpose include compounds of phosphorus, sulfur, and boron, as well as molybdenum sulfides and mono- and dianhydrides of aromatic acids. This paper presents results of an experimental program in which a series of modified succinimide compounds was evaluated as lubricating are additives in scoring tests.