Abstract
In this article, Lewis acid–base complex of lithium 12-hydroxystearate (LHS) with diboron compound is formed by the introduction of bis(pinacolato)diboron (B2Pin2) into lithium grease. The interaction between Lewis acid B2Pin2 and Lewis base RCO2− of LHS is characterized by various techniques. Moreover, the rheological and tribological behaviors of the base grease are evaluated at low and moderate temperature. The results indicate that the addition of B2Pin2 can noticeably enhance the rheological property of the base grease because the formation of Lewis acid–base complex is beneficial for improving the soap fiber structure strength, and B2Pin2 could also help reduce the friction and wear of the grease during the sliding process, which likely owing to the boundary lubrication film generated by B2Pin2 adsorption on the rubbing surface and tribochemical reaction between borate esters and steel surfaces. The improvement of mechanical stability and tribological properties is beneficial to increasing the grease service life.Graphical
Highlights
Bearings are crucial tribological components of many types of machinery
The proposed Lewis acid–base interaction of B 2Pin2 with lithium 12-hydroxystearate (LHS) was shown in Scheme 1
The interaction of bis(pinacolato) diboron (B2Pin2) with lithium 12-hydroxystearate (LHS) in lithium grease was characterized, and the rheological and tribological performance of the grease additized with B2Pin2 was investigated at low and moderate temperatures
Summary
Bearings are crucial tribological components of many types of machinery. From a small supermarket shopping trolley to huge power plants, a great number of light-duty as well as industrial equipment could not function without the use of bearings in some form. Facilitated by the Lewis acid–base interaction between B center of the diboron reagent and the surface bridging O2c of semiconductor oxidematerials (e.g., TiO2, ZnO, SnO2) nanoparticles, the adsorption of diboron species onto these nanoparticles results in spontaneous electron transfer, leading to various important transformations [16, 17]. This strategy offers an effective approach for functionalizing the fiber structure of lubricating grease. The rheological behavior and tribological property of the lubricating grease with different contents of B2Pin were evaluated at temperatures below 70 °C
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