Preparation of few-layer MoS2/PTFE synergistic wear-resistant agent and its application in high wear-resistant and adhesion polyimide coatings

Polyimide (PI) exhibits high-temperature resistance and corrosion resistance, making it a high-potential coating substrate. However, for use in automotive motor bearings, its adhesion and wear resistance still require improvement. This study investigated the efficient exfoliation of MoS 2 and combined few-layer MoS 2 with Polytetrafluoroethylene (PTFE) as a synergistic wear-resistant agent, which can be incorporated into PI coatings to improve the wear resistance. It achieved a minimum coefficient of friction (COF) of 0.073 and a wear rate of 0.0554 × 10 −5  mm 3 /(N·m). This result is attributed to the layered structure of few-layer MoS 2 and its synergistic interaction with PTFE. The structure of PI contains numerous ether bonds and highly polar sulfone groups that can bind to metal surfaces. The resulting coating achieves level 0 adhesion (ISO 2409:2020) on metal substrates for bearings, while exhibiting high toughness, impact resistance, and coolant resistance. This work is of great significance to research on high-adhesion coatings and nanoscale synergistic lubrication.