Oxidation and low temperature stability of vegetable oil-based lubricants

Erhan, Sevim Z.; Sharma, Brajendra K.; Perez, Joseph Manuel Sr

doi:10.1016/j.indcrop.2006.06.008

Cited by 320 publications

(168 citation statements)

References 12 publications

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“…Biodegradability provides an indication of the persistence of any particular substance in the environment and is the yardstick for assessing the eco friendliness of substances (Aluyor et al 2009). However, extensive vegetable oil use is restricted owing to the poor fluid flow behaviour, solidification at low temperatures (Hwang & Erhan 2001;Li et al 2004) and low oxidative (Adamczewska & Wilson 1998;Coscione & Artz 2005;Dunn 2005;Erhan et al 2006b) and hydrolytic stability. The most serious problem is their poor oxidative stability, primarily owing to the presence of bis allylic protons.…”

Section: Phil Trans R Soc a (2010)mentioning

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: Phil Trans R Soc a (2010)mentioning

confidence: 99%

Green waxes, adhesives and lubricants

Kong

Ruan

et al. 2010

Phil. Trans. R. Soc. A.

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“…The optimum condition for CO epoxidation occurred at temperature, 52.81°C; hydrogen peroxide to ethylenic unsaturation molar ratio, 1.65; catalyst loading, 15.14 wt %; and reaction time, 2.81 h. At this optimal condition, maximum epoxide content and relative conversion to oxirane was found to be 3.85mass% and 0.71%. Further, the product was confirmed by 1 H-NMR, 13 C-NMR, IV, and oxirane analysis. Quadratic polynomial model and ANOVA has well explained the interaction between the process variables.…”

Section: Resultsmentioning

confidence: 86%

“…However, the partial disappearance of unsaturation bands have been noticed (Fig. S8b) Figure 3A and B show 13 C NMR spectra of CO and its epoxide. Appearance of peaks at 125-133 ppm represents the olefinic carbons in CO (Fig.…”

Section: Nmr Spectroscopymentioning

confidence: 96%

“…Even though the plant seed oils offer many advantages, they restrict their direct use due to the inadequate thermal and oxidative stability, hydrolytic stability, and poor cold flow properties [9]. These negative impacts are due to the presence of bisallylic protons in plant seed oils structure which are highly susceptible to free radical attack, and thereby it undergoes oxidative degradation to form polar oxy compounds [10][11][12][13]. Plant seed oil oxidizes similarly to the hydrocarbon mineral oil by following the same free radical oxidation mechanism, but the oxidation rate of plant seed oils is faster than the hydrocarbon mineral oils [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Response surface methodology for optimization of bio‐lubricant basestock synthesis from high free fatty acids castor oil

Borugadda

Goud

2015

Energy Science & Engineering

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In this paper, an eco-friendly single-step process for the synthesis of biolubricant basestock from high free fatty acid (FFA) castor oil (CO) via epoxidation reaction was investigated. Influence of various process parameters on the structural modification of CO and their interaction with the maximum oxirane oxygen content (OOC) was optimized. Central composite design (CCD) as one of the tools in response surface methodology (RSM) was used to evaluate the effects of process variables on maximum OOC. Iodine value (IV) and OOC was used to monitor the progress of epoxidation. From the RSM study, the optimal condition inferred was H 2 O 2 , 1.65 mol; catalyst loading, 15.14 wt%; temperature, 52.81°C; and reaction time, 2.81 h. At this optimum condition, OOC was found to be 3.85 mass%. Further, the epoxide product was confirmed by 1 H, 13 C NMR spectral technique and OOC was determined by the standard HBr method. Finally, the significant physico-chemical properties for the prepared epoxide were determined and compared with the castor oil. 372

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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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Oxidation and low temperature stability of vegetable oil-based lubricants

Cited by 320 publications

References 12 publications

Green waxes, adhesives and lubricants

Green waxes, adhesives and lubricants

Response surface methodology for optimization of bio‐lubricant basestock synthesis from high free fatty acids castor oil

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

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