State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences.
University of Chinese Academy of Sciences.
J Oleo Sci. 2022;71(6):915-925. doi: 10.5650/jos.ess21435.
In this study, bio-based ionic liquid prepared from ricinoleic acid and choline was firstly used as additive in lithium base grease. The characterization and tribological performance of the prepared ionic liquid ([cho][ricinoleic]) as additive in grease were studied compared with the traditional ionic liquid such as L-P104. All the concentrations showed promising friction-reducing and anti-wear properties, though a 3% concentration has superior lubricating properties than others. Furthermore, [cho][ricinoleic]) can greatly enhance the lubrication capability of lithium base greaseunder different frequency and load at room temperature. Although L-P104 showed good lubricating performance than [cho][ricinoleic] at 150°C, the chosen formulation (1.5% [cho][ricinoleic] + 1.5% L-P104) could have better synergism at high and room temperature, which could be a good supplement to ionic liquid as grease additive. Thin films formed according to the results of SEM and XPS were attributed to be the main account for the preferable tribological properties of [cho][ricinoleic] in lithium base grease.
在这项研究中，首次将蓖麻油酸和胆碱制备的生物基离子液体用作锂基润滑脂中的添加剂。与传统的离子液体如 L-P104 相比，研究了制备的离子液体([cho][ricinoleic])作为润滑脂添加剂的特性和摩擦学性能。所有浓度都表现出有希望的减摩和抗磨性能，尽管 3%浓度的润滑性能优于其他浓度。此外，[cho][ricinoleic])可以在室温下不同频率和载荷下大大提高锂基润滑脂的润滑性能。尽管在 150°C 时 L-P104 比 [cho][ricinoleic]具有更好的润滑性能，但所选配方(1.5%[cho][ricinoleic]+1.5%L-P104)在高温和室温下可能具有更好的协同作用，这可以作为离子液体作为润滑脂添加剂的良好补充。根据 SEM 和 XPS 结果形成的薄膜被认为是 [cho][ricinoleic]在锂基润滑脂中具有优异摩擦学性能的主要原因。
