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Benefits of Antioxidants in Lubricants and Greases Assessed by Pressurised Differential Scanning Calorimetry

机译：加压差示扫描量热法评估润滑剂和油脂中抗氧化剂的益处

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摘要

The long-term thermo-oxidative stability of lubricants and greases is a prerequisite to meet today's 'stay in grade' and extended drain interval requirements. To achieve this goal, there is a need for a better understanding of thermo-oxidative lubricant degradation and of how antioxidants can affect this process. In this paper a two-stage degradation model is discussed. Primary degradation leads to the formation of very reactive species such as radicals and peroxides. These are the precursors for generating secondary degradation products, such as oligomers, sludge, or deposits. By applying the theory of reaction kinetics and the Arrhenius law, quantitative correlations may be derived between oxidation induction time (OIT) and temperature, and between OIT and antioxidant treat level. Pressurised differential scanning calorimetry (PDSC) data confirm these theoretical findings and demonstrate the benefit of the addition of atninic antioxidants in comparison with high-molecular-weight hindered phenolic antioxidants.
机译：润滑剂和油脂的长期热氧化稳定性是满足当今“保持等级”和延长排水间隔要求的先决条件。为了实现该目标，需要更好地理解热氧化润滑剂的降解以及抗氧化剂如何影响该过程。本文讨论了两阶段退化模型。初级降解导致形成非常活泼的物种，例如自由基和过氧化物。这些是产生次级降解产物（例如低聚物，污泥或沉积物）的前体。通过应用反应动力学理论和阿伦尼乌斯定律，可以得出氧化诱导时间（OIT）与温度之间以及OIT与抗氧化剂处理水平之间的定量相关性。加压差示扫描量热法（PDSC）数据证实了这些理论发现，并证明了与高分子量受阻酚类抗氧化剂相比，添加抗氧化剂。

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