Facile Synthesis of Lignin-Castor Oil-Based Oleogels as Green Lubricating Greases with Excellent Lubricating and Antioxidation Properties

Abstract

In this study, a facile synthesis method was employed to create lignin-castor oil-based oleogels by modifying organic lignin with two silane coupling agents. The resulting oleogels demonstrated outstanding lubricating and antioxidation properties, establishing them as promising green lubricating greases. Compared with the pure castor oil, the oxidation induction time (OIT) value of the synthesized oleogels was significantly increased from 20 s (pure castor oil) to 1959 s (oleogel with 20 wt % lignin), indicating an effective improvement of the oxidation resistance. The steel contacts lubricated by the synthesized oleogel also had lower wear than those lubricated by pure castor oil, signifying the better lubricating properties of oleogels. The oleogel with 20 wt % lignin showed the lowest wear, which was around 64% lower than that of pure castor oil. The exceptional performance and environmentally sustainable composition of these oleogels, with the biomass content exceeding 80%, allow them to be used as green lubricating greases for industrial applications. Overall, this study provides valuable insights into the development of high-performance, eco-friendly lubricants.

Role of Silicoaluminophosphate as a Corrosion Inhibiting Nanocontainer and Filler in Environmentally Benign Bio-Based Hybrid Coatings

“…Among organic coatings, polyurethanes (PU) are one of the most versatile polymers that are broadly used due to their aesthetic physical properties like anticorrosion, chemical resistance, abrasion resistance, flexibility, toughness, controllable hardness, and transparency, making them a potential candidate to work in a wide range of industrial and commercial applications including coatings, sealants, foams, and adhesives. − Since inception, PUs have mostly been prepared from fossil-fuel-based raw materials or polyols. However, owing to the depletion of the fossil feedstocks, there arises an alternative to use green and renewable resources in order to prepare the starting polyol. − Bio-renewable resources-based plant and vegetable oil serves the purpose for replacing the use of petroleum-based products in industry. , Among the various oils, oil of castor seeds (CO) is very inexpensive and is proposed to have an ample amount of usage in various industrial related fields like bio-fuels, medicines, cosmetics, paints, coatings, inks, and lubricants. − Additionally, the presence of hydroxyl functionality in the castor oil makes it a suitable bio-based polyol resin that can commonly be used as a precursor for the synthesis of polyurethanes …”