Improvement of oxidation stability, hydrolytic stability and tribological properties of kaolin particles doped bio-based green palm oil

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-05-05 Epub Date: 2025-02-17 DOI:10.1016/j.colsurfa.2025.136441

Batuhan Özakın , Kürşat Gültekin , Halil İbrahim Yurdgülü

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Abstract

Petroleum-based lubricants used in metalworking pose environmental and health risks due to harmful byproducts from combustion and waste disposal. This highlights the need for eco-friendly bio-based lubricants, which, despite their benefits, exhibit low oxidative and hydrolytic stability. Nano-additives provide a sustainable and cost-effective solution to improve these properties. In this study, nanolubricants were prepared by doping kaolin nanoparticles subjected to surface modification with oleic acid to bio-based palm lubricants. The tribological performance of lubricants was assessed via wear tests, oxidative stability was evaluated using the hot oil oxidation test, and hydrolytic stability was determined through the Karl Fischer titration method. Palm lubricants doped with 0.75 wt% kaolin improved the coefficient of friction and wear rate by 29.5 %, and 43.9 %, respectively. Kaolin nanoparticles doped to palm lubricants were found to reduce wear damage and encourage the development of tribo-films. The oxidation and hydrolytic stability of palm lubricants doped with 0.125 wt% kaolin nanoparticles increased by 21.81 % and 29.5 %, respectively, in comparison to undoped palm lubricants.

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生物基绿棕榈油掺杂高岭土颗粒的氧化稳定性、水解稳定性和摩擦学性能的改善

金属加工中使用的石油基润滑油由于燃烧和废物处理产生的有害副产品而造成环境和健康风险。这突出了对生态友好型生物基润滑剂的需求，尽管它们有好处，但它们表现出低氧化和水解稳定性。纳米添加剂为改善这些性能提供了可持续和经济的解决方案。在本研究中，将高岭土纳米颗粒经油酸表面改性后掺杂到生物基棕榈润滑油中制备纳米润滑剂。通过磨损试验评价润滑油的摩擦学性能，通过热油氧化试验评价润滑油的氧化稳定性，通过卡尔费希尔滴定法测定润滑油的水解稳定性。掺0.75 wt%高岭土的棕榈润滑油，摩擦系数和磨损率分别提高29.5%和43.9% %。研究发现，将高岭土纳米颗粒掺杂到棕榈润滑油中可以减少磨损损伤，并促进摩擦膜的形成。掺0.125 wt%高岭土纳米颗粒的棕榈润滑油的氧化稳定性和水解稳定性分别比未掺高岭土的棕榈润滑油提高21.81 %和29.5 %。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.