This study aims to investigate a novel high-efficient antioxidant for synthetic ester oils. An ester-bridged antioxidant, phloroglucinol tris (3-[3,5-di-tert-butyl-4-hydroxyphenyl]) propionate (PTP), was successfully synthesised in high yield under relatively mild reaction conditions. Thermal stability and oxidation resistance of diisooctyl adipate (DOA) ester oil were determined and compared to the typical commercial phenol antioxidants, including its tribological properties. The results indicate that the prepared PTP antioxidant exhibits considerably higher thermal stability than commercial antioxidants, and it also improves the oxidation resistance of the synthetic ester oil more effectively. Moreover, the addition of PTP antioxidant enhanced the wear protection of DOA ester oil without deteriorating its lubricating performance. The ester-bridged antioxidant can be used as a multifunctional additive, which not only exerts excellent thermal stability and oxidation resistance, but can also act as an efficient anti-wear agent in synthetic ester oils.

中文翻译：

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酯油多功能添加剂酯桥抗氧剂的制备及性能评价

本研究旨在研究一种用于合成酯油的新型高效抗氧化剂。在相对温和的反应条件下以高收率成功合成了酯桥抗氧化剂间苯三酚三 (3-[3,5-二叔丁基-4-羟基苯基]) 丙酸酯 (PTP)。测定了己二酸二异辛酯 (DOA) 酯油的热稳定性和抗氧化性，并与典型的商业苯酚抗氧化剂进行了比较，包括其摩擦学特性。结果表明，制备的PTP抗氧剂比市售抗氧剂表现出更高的热稳定性，同时也更有效地提高了合成酯油的抗氧化性。此外，PTP抗氧剂的添加增强了DOA酯油的耐磨性，而不会降低其润滑性能。