The reliable operation of industrial compressors and turbines heavily depends on the quality and stability of their lubricating oils, which are frequently subjected to extreme thermal and mechanical stresses. Over time, these harsh operating conditions lead to the oxidative degradation of base oils, resulting in the formation of sludge, varnish, and solid deposits that can severely compromise machinery efficiency and longevity. This paper investigates the deposit control mechanism of Polyisobutylene-Bis-Succinimide (PIBSI) dispersants within compressor and turbine lubricant formulations. By exploring the molecular interactions between the polar succinimide head groups and deposit precursors, alongside the steric stabilization provided by the polyisobutylene tails, this research elucidates how PIBSI mitigates the agglomeration of degradation products. A structured framework detailing the chemical adsorption and micelle formation mechanisms is proposed, accompanied by a hypothetical evaluation plan designed to assess dispersant efficacy under boundary lubrication and elastohydrodynamic lubrication (EHL) conditions. Through this comprehensive analysis, the study highlights both the critical benefits and the inherent limitations of PIBSI applications, ultimately charting a course for future advancements in lubricant additive technology.
Gund et al. (Thu,) studied this question.