Abstract
Two self-prepared multi-phenol antioxidants, 2,4,6‐tris(3,5‐di‐tert‐butyl‐4‐hydroxyphenylthio)‐1,3,5‐triazine (THA) and phloroglucinol tris(3-(3,5-di-tert-butyl-4-hydroxyphenyl)) propionate (PTP), were separately introduced into ester lubricants to investigate their antioxidative and tribological properties and mechanisms. A self-assembled platform combining a tribological tester and infrared spectrometer was employed to acquire the online infrared spectra for determining the structural variation of the lubricants with added THA/PTP during friction under high-temperature oxidation. The online infrared spectra indicated that PTP inhibited the oxidation of the ester lubricant more effectively than THA did. Moreover, the PTP antioxidant exhibited friction and wear reduction in the ester lubricant, outperforming THA. The encouraging results of the PTP suggest that multi-phenol antioxidants bridged by ester linkages can be used as multifunctional agents for ester lubricants.
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