DEVELOPMENT OF N-CONTAINING, P-CONTAINING AND S-CONTAINING MULTIFUNCTIONAL ADDITIVES FOR LUBRICANTS

Metallic dialkyldithiophosphates, namely, ZDDP, are widely used in for mulating lubricants to enhance their antioxidant, antiwear, extreme pr essure and antifriction properties. These ash bearing additives lead t o operational problems and the use of some metals is being restricted for environmental resasons. This paper describes the synthesis and eva luation of a new class of alkylamino phosphorodithioates for use as ad ditives in lubricant formulations. Eight ashless alkylamino phosphorod ithioates with varying alkyl chain lengths from C5 to C18 have been sy nthesized and their antiwear, antifriction, extreme pressure and antio xidant performance examined compared to a commercial ZDDP in a mineral base oil. The synthesized products have been found to exhibit appreci able antiwear and antioxidant properties and mild antifriction/extreme pressure performance.