Effect of the combination of antioxidant and dispersant in traction oils on their interaction and lubricating property

SF Xu and YF Yu and Z Wang and H Li and SL Li and JJ Lu and JQ Shi, TRIBOLOGY INTERNATIONAL, 198, 109844 (2024).

DOI: 10.1016/j.triboint.2024.109844

Molecular dynamics simulation is utilized to reveal the interaction and lubricating property of polyisobutylsuccinimide-polyamine (PIB-PAM) dispersant and phosphorus compound (PAE3) antioxidant in two traction systems (JP1E, JP1EC). The content ratio of PIB-PAM to PAE3 is changed. The static self-assembly of additives is observed, while PIB-PAM molecules with strongly intermolecular entanglement displays a suppressive effect on the molecular diffusion. In the shear process, the adsorption of base oil on surfaces shows a non-wall-slip friction state, and the increasing shear rate causes the adsorption film thinning and the friction coefficient rise. The strong intermolecular interaction in lubricating system induces high friction resistance. The fundamental insights into the interaction mechanism of different additives are helpful for improving lubricant research and development.

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