A friction coefficient of 0.05 in aqueous systems

Abstract

Low friction coefficients, i.e., below 0.10, in mineral oil based lubricants have been traditionally obtained using glycerol mono oleate, molybdenum dithiocarbamate or molybdenum dithiophosphate. In aqueous systems this is more difficult to achieve, and wear protection is also problematic due to the polar nature of the substrate. There is substantial interest in low toxicity/ecotoxicity additives, especially in metalworking fluid applications, where disposal of the finished fluid can be expensive. In this paper, a novel ashless (metal-free) friction modifier with antiwear properties, specifically designed for aqueous systems, is reviewed. This additive does not contain phosphorus, sulphur, or halogens. Some preliminary results in water based lubricants, for example, polyalkylene glycols, for metal forming applications are presented.