Structural criterion for the antiwear properties of lube oils

A new concept was developed for evaluating the antiwear properties of lubricants-based on the value and distribution of the micromechanical characteristics in the near-surface layer deformed by friction. A diagnostic parameter for wear-fatigue processes is proposed: the micromechanical strength characteristic gradient, expressed in terms of the structural state criterion, formed in the near-surface layer of steel parts as a result of friction. This criterion can be used for assessing the antiwear and antiscuff properties of lube oils. Oils with high antiwear characteristics form minimal positive micromechanical property gradients in the near-surface layer of the metal. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 28–32, May–June, 2007.     

Co-oligomers of allylnaphthenates and vinyl monomers as viscosity additives for lube oils

The possibility of obtaining viscosity additives for petroleum and synthetic oils by synthesizing co-oligomers of allylnaphthenates with butyl methacrylate and allylnaphthenates with styrene was investigated. The conditions for obtaining co-oligomers with assigned properties were found. The compounds obtained have improved viscosity-temperature properties and are much more resistant to thermal effects than industrial viscosity additives. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 35–36, July–August, 2007.