Tribological studies of thermally and chemically modified vegetable oils for use as environmentally friendly lubricants

Adhvaryu, Atanu; Erhan, Sevim Z.; Perez, Joseph Manuel Sr

doi:10.1016/j.wear.2004.01.005

Cited by 235 publications

(151 citation statements)

References 16 publications

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“…One of the several ways to reduce unsaturation is to partially hydrogenate (Dehault & Demoulin 1984;King et al 2001) these vegetable oils to improve their service lives without affecting the freezing points to a large extent. Epoxidation (Adhvaryu et al 2004;Castro et al 2006;Fox & Stachowiak 2007; R e t r a c t e d Additionally, neat vegetable oils also pose some problems when subjected to extended use in internal combustion engines. These problems are attributed to high viscosity, low volatility and polyunsaturated character of neat vegetable oils, which could be substantially reduced by conducting chemical modifications to the carboxyl group in TAG molecules of vegetable oils.…”

Section: (B) Present Randd Progressmentioning

confidence: 99%

Green waxes, adhesives and lubricants

Kong

Ruan

et al. 2010

Phil. Trans. R. Soc. A.

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General characteristics of waxes, adhesives and lubricants as well as the recent fundamental investigations on their physical and mechanical behaviour are introduced. The current R&D status for new type/generation of waxes, adhesives and lubricants from natural products is reviewed, with an emphasis on their tribological applications. In particular, some crucial issues and challenges relating to technological improvement and materials development are discussed. Based on the current predicted shortage of energy resources and environmental concerns, prospective research on the development of green waxes, adhesives and lubricants is suggested.

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Section: (B) Present Randd Progressmentioning

confidence: 99%

Green waxes, adhesives and lubricants

Kong

Ruan

et al. 2010

Phil. Trans. R. Soc. A.

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“…Natural biodegradable oils possess good anti-wear properties and low friction [26]. The conventional lubrication mechanisms based on physical and chemical adsorption, where the polar molecules play a key role in interactions with the sliding surfaces, the best tribological performance is expected for vegetable oils, which consist of a considerable amount of fatty acids with unsaturated bonds [27]. Vegetable oils are renewable resources, environmentally friendly non-toxic fluids, biodegradable and have no health hazards.…”

Section: Introductionmentioning

confidence: 99%

“…The triacrylglycerol structure of vegetable oil makes it an excellent candidate for potential use as a base stock for lubricants and functional fluids [28]. It was observed that wear resistance of lubricated surfaces can be significantly improved by the formation of a stable tribochemical film [29]. This film can be applied on the sliding surfaces through the polar action of vegetable oil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field on the Friction and Wear of Polyamide Sliding against Steel

Abdel-Jaber¹,

Mohamed²,

Ali³

2014

MSA

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The present work discusses the friction and wear of polyamide sliding against steel in the presence of magnetic field. Tests were carried out at dry and oil lubricated steel surfaces. Paraffin and vegetable oils such as almond, castor, corn, glycerine, jasmine, olive and sun flower oils were used as lubricants. The friction coefficient and wear were investigated using pin on disc wear tester. Based on the experimental results, it was found that application of magnetic field on the contact area affected both friction coefficient and wear of polyamide sliding against steel at dry and oil lubricated conditions. Magnetic field decreased friction coefficient. Lubricating the sliding surface by paraffin oil as well as almond, castor, corn, glycerine, jasmine, olive and sun flower oils significantly decreased friction coefficient. Generally, friction coefficient increased with increasing applied load. Dry sliding of polyamide against steel surface showed increased wear with increasing load. The lowest wear values at no magnetic field were displayed by jasmine oil followed by sun flower, almond, olive, castor, corn, glycerine and paraffin oils. Under the application of magnetic field, the lowest wear values were displayed by sun flower oil followed by jasmine, castor, glycerine, olive, paraffin, almond and corn oils. It can be concluded that friction and wear decrease observed at dry sliding can be explained on the basis that presence of magnetic field around the contact area decreased the adherence and transfer of polyamide into the steel surface. For oil lubricated sliding, the polar molecules of the tested lubricating oils were much affected by the magnetic field, where they oriented themselves to the polar end directed towards the sliding surface making a close packed multi-molecular layered surface film that could protect the sliding surfaces from excessive wear.

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“…Erhan and co-workers (Erhan and Asadauskas, 2000;Adhvaryu and Erhan, 2002;Adhvaryu et al, 2004;Erhan et al, 2006) have reported some advantages and disadvantages concerning the use of vegetable oils and organic esters as liquid lubricants. As they pointed out, the main disadvantage of vegetable oils is their poor oxidative stability in comparison to some of the mineral oils traditionally employed.…”

Section: Introductionmentioning

confidence: 99%

Rheology of oleogels based on sorbitan and glyceryl monostearates and vegetable oils for lubricating applications

Sánchez¹,

Franco²,

Delgado³

et al. 2011

Grasas y Aceites

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Oleogels based on sorbitan and glyceryl monostearates and different types of vegetable oils, potentially applicable as biodegradable alternatives to traditional lubricating greases, have been studied. In particular, the rheological behavior, by means of small-amplitude oscillatory shear (SAOS) measurements, and some lubrication performance-related properties (mechanical stability and tribological response) have been evaluated in this work. SAOS response and mechanical stability of these oleogels are significantly influenced by the type and concentration of the organogelator and the vegetable oil used in the formulations. Glyceryl monostearate (GMS) generally produces stronger gels than sorbitan monostearate (SMS). The use of low-viscosity oils, such as rapeseed and soybean oils, yields gels with significantly higher values of the linear viscoelastic functions than oleogels prepared with high-viscosity oils, i.e. castor oil. The rheological behavior of SMS-based oleogels also depends on the cooling rate applied during the gelification process. On the other hand, the oleogels studied present low values of the friction coefficient obtained in a tribological contact, although only some GMS/castor oil-based oleogels exhibit a suitable mechanical stability.<br><br>En el presente trabajo se han estudiado diferentes oleogeles, basados en monoestearatos de sorbitano y glicerilo y aceites vegetales, que podrían ser potencialmente empleados como alternativas biodegradables a las grasas lubricantes tradicionales. En concreto, se ha evaluado su comportamiento reológico, a través de ensayos en cizalla oscilatoria, y algunas propiedades relacionadas con su rendimiento en la lubricación, tales como su estabilidad mecánica y comportamiento tribológico. La respuesta reológica y la estabilidad mecánica de los oleogeles estudiados están significativamente influenciadas por el tipo y la concentración del agente gelificante y por el aceite vegetal empleado. Así, el monoestearato de glicerilo (GMS) produce, generalmente, geles más fuertes que el monoestearato de sorbitano (SMS). El uso de aceites de baja viscosidad, como los aceites de colza o de soja, dan lugar a geles con valores más altos de las funciones viscoelásticas lineales que los oleogeles preparados con aceite de ricino. El comportamiento reológico de los oleogeles de SMS depende, además, de la velocidad de enfriamiento durante la gelificación. Por otra parte, los oleogeles estudiados presentan bajos valores del coeficiente de fricción, determinado en un contacto tribológico, aunque sólo algunos oleogeles que contienen GMS y aceite de ricino muestran una estabilidad mecánica adecuada

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Tribological studies of thermally and chemically modified vegetable oils for use as environmentally friendly lubricants

Cited by 235 publications

References 16 publications

Green waxes, adhesives and lubricants

Green waxes, adhesives and lubricants

Effect of Magnetic Field on the Friction and Wear of Polyamide Sliding against Steel

Rheology of oleogels based on sorbitan and glyceryl monostearates and vegetable oils for lubricating applications

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