Abstract
The development of a sustainable and environmentally friendly alternative to petroleum-based lubricants is a major challenge. In this study, layered double hydroxide (LDH) vegetable oil gels were prepared from stearic-acid-intercalated LDH (LDH-SA) and vegetable oil. The effects of content of LDH-SA and types of vegetable oils on the rheological properties of the gels were studied. The effects of several plant-derived antioxidants on the oxidative stability of LDH-SA gels were also investigated. Further, the tribological properties of LDH-SA gels were studied and compared with those of a lithium grease under the same conditions. The results showed that LDH-SA gels exhibit the typical rheological properties of grease, such as viscoelasticity, shear thinning, and structural thixotropy. Tocopherols, tea polyphenol, gallic acid, and their combinations can enhance the oxidative stability of LDH-SA gels. The tribological experiments showed that LDH-SA gels maintained the inherent excellent tribological properties of their corresponding vegetable oil. LDH-SA gels provide a new idea for the development of environmentally friendly lubricants.
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