Additive properties of saturated very long chain fatty acids in castor and jojoba oils

Abstract

Tribological and oxidation stability properties of saturated very-long-chain-fatty acids present in castor and jojoba oils have been investigated by the four ball tribosystem, pressure differential scanning calorimetry, optical micrographs and electron probe micro-analysis (EPMA). Test results of the oils additized with eicosanoic and octadecanoic acids in the oils were compared with those of zinc dialkyldithiophosphate (ZDTP). Results showed that eicosanoic and octadecanoic acids possessed better antiwear and lubricity properties compared to the popular ZDTP, though with reduced oxidation stability. EPMA and optical micrographs of worn surface morphology showed that lubricating films formed by these acids were metallic salts whose breakdown was not associated with tribochemical wear surface modification of the mating pairs.

Tribological Behaviour of Neem Oil with and without Graphene Nanoplatelets Using Four-Ball Tester

“…Li et al have demonstrated the application of natural garlic oil as a high performance and extreme pressure additive for lubricants [33]. Ossia et al have acknowledged the presence of eicosanoic and octadecanoic acids in castor and jojoba oil and enhancing their oxidation stability and tribological properties [34]. Carbonaceous particles like soot, graphene, multiwalled carbon nanotube showed very good lubricity [35][36][37].…”

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

“…Li et al [7] illustrated the application of an extract of natural garlic oil as a high-performing and environmentally friendly extreme pressure additive in lubricating oils. Ossia et al [8] showed that eicosanoic and octadecanoic acids present in castor and jojoba oil enhanced the tribological and oxidation stability of castor and jojoba oil as well as mineral oil base-stocks. Erhan et al [9] disclosed the use of poly (hydroxy thioether) vegetable oil derivatives as antiwear/antifriction additives for environmentally friendly industrial oils in automotive applications.…”

Lubricating and Waxy Esters, V: Synthesis, Crystallization, and Melt and Flow Behaviors of Branched Monoesters Incorporating 9-Decenol and 9-Decenoic Acid

“…The Trent Centre for Biomaterials Research (TCBR) is conducting comprehensive fundamental studies of the synthesis, crystallization, melt, polymorphism, solid fat content, viscosity, and modeling of the structure and function of jojoba-like wax ester (JLE) analogues: linear mono-, di-, and triesters and their branched derivatives. The oil from the jojoba plant is very interesting because it is mainly composed of linear wax esters rather than triacylglycerols (TAGs) as is the case for all other known seed oils. − Because of its molecular structure, jojoba oil displays quite distinct properties suitable for a variety of high-end applications such as pharmaceuticals, cosmetics, and high-grade lubricant oil formulations . Unfortunately, its cost and availability impede its large-scale use .…”

“…33−35 Because of its molecular structure, jojoba oil displays quite distinct properties suitable for a variety of highend applications such as pharmaceuticals, cosmetics, and highgrade lubricant oil formulations. 36 Unfortunately, its cost and availability impede its large-scale use. 37 The production of JLEs from commonly available and economical feedstocks, such as oleic acid, is an alternative that has attracted significant interest.…”