2026-10-14T18:19:47Z https://www.scidb.cn/oai

10.57760/sciencedb.39876 2026-06-22T15:42:31Z

2026-06-22 Preparation and Tribological Performances of Polyurea-type Ionic Liquid Water-based Lubrication Additives doi:10.57760/sciencedb.39876 en Compared with oil-based lubricants, water-based lubricant systems possess excellent cooling and flame-retardant properties, offering great application potential in many fields. However, the highly polar water molecules usually weaken the interactions between water-based lubricant additives and interfaces, thereby hindering the formation of the interfacial adsorption layer and ultimately resulting in poor extreme pressure load-carrying capacity of water-based lubricants. In this study, a polyurea-type ionic liquid was prepared as a water-based lubricant additive. The hydrogen bonding interactions between urea groups enabled the polymer to form a more stable adsorption layer at the interface. The existence of a large number of hydrogen bonds and tribo-chemical films in the polyurea-type ionic liquid was confirmed by multiple characterization technologies (temperature-dependent FTIR, two-dimensional IR, XPS and QCM-D). By comparing the effects of small molecule ionic liquids and polyurea units with different rigidity on the tribological performances of water-based lubricants, it was proved that the synergistic effect of multiple non-covalent interactions (hydrogen bonding, electrostatic interactions and hydrophobic effects) in polyurea ionic liquids can significantly improve the anti-friction, anti-wear performance, and extreme pressure load-carrying capacity of the water-based lubrication system. The final polyurea-based ionic liquid achieved a coefficient of friction as low as 0.12 and an extreme pressure capacity up to 1000 N at a concentration of 2%, while the corrosion to metals was significantly reduced. water-based lubricant additive; non-covalent bond interaction; tribo-chemical reaction; polyurea; ionic liquid Lin Nanyi Tang Hui Zhang Lihui Wang Mingying Ma Zhengfeng Wang Rui Liu Weimin PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank