Development of new green lubricating grease formulations based on cellulosic derivatives and castor oil

Sánchez, R.; Franco, J.M.; Delgado, Miguel; Valencia, C.; Gallegos, C.

doi:10.1039/b820547g

Cited by 79 publications

(58 citation statements)

References 28 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figures 3a and 3b show TGA curves in the form of a weight loss derivative function for estolides from high-oleic sunflower and olive pomace acid oils, respectively. Table 4 gathers the main characteristic parameters derived from this thermal analysis, estimated as indicated elsewhere (Sánchez et al, 2009). As can be observed, the thermal decomposition of acid oils occurs in two stages (DTG maximum peaks at 257 °C and 400 °C for HOSOL and 284 °C and 429 °C for OPOL).…”

Section: Thermal Characterization Of Acid Oils and Derived Estolidesmentioning

confidence: 99%

Chemical, thermal and viscous characterization of high-oleic sunflower and olive pomace acid oils and derived estolides

García‐Zapateiro¹,

Franco²,

Valencia³

et al. 2013

Grasas y Aceites

Self Cite

View full text Add to dashboard Cite

RESUMEN Caracterización química, térmica y viscosa de oleí-nas ácidas de girasol alto oleico y orujo de oliva y estó-lidos derivadosEste trabajo presenta la caracterización química, térmica y viscosa de estólidos preparados a partir de oleínas ácidas de girasol alto-oleico y de orujo de oliva, utilizando diferentes métodos catalizados por ácidos y diferentes tiempos de reacción. Se obtuvieron estólidos con pesos moleculares promedios en peso entre 1,7 y 3,4 veces más altos que las oleínas de origen. El peso molecular de los estólidos aumenta cuando se utiliza el método catalizado por ácido sulfúrico y un tiempo de reacción de 3-6 h. Los estólidos obtenidos presentan temperaturas de congelación más altas que las oleínas. En general, los valores de viscosidad están relacionados con el peso molecular del estólido. Se encontraron incrementos significativos de viscosidad en comparación con las oleínas. Los valores máximos de viscosidad se obtuvieron para los estólidos preparados con el método catalizado por ácido sulfúrico. En los estólidos derivados de oleína de orujo de oliva se observaron los mayores incrementos de viscosidad durante las 6 primeras horas de reacción, debido al mayor aumento en el peso molecular. Tiempos más largos de reacción dan lugar a resultados desfavorables. La dependencia de la viscosidad con la temperatura de todos los estólidos es más importante que en las oleínas de partida. PALABRAS CLAVE: Análisis térmico -BiolubricantesEstólido -Oleínas ácidas de girasol alto oleico -Oleínas ácidas de orujo de oliva -Subproductos -Viscosidad. SUMMARY Chemical, thermal and viscous characterization of high-oleic sunflower and olive pomace acid oils and derived estolidesThis work deals with the chemical, thermal and viscous characterization of a variety of estolides, prepared from higholeic sunflower and olive pomace acid oils, using different acid-catalyzed synthesis protocols and reaction times. Estolides with weight-average molecular weights between 1.7 and 3.4 times higher than the original acid oils were obtained. The molecular weight of the estolides was higher when using the sulphuric acid-catalyzed method and a reaction time of 3-6 h. Estolides presented higher freezing temperatures than acid oils. In general, viscosity values are related to estolide molecular weight. Significant increments in viscosities were found in comparison with acid oils. Maximum viscosity values were obtained for estolides prepared using the sulphuric acidcatalyzed method. The largest viscosity increments in olive pomace acid oil-derived estolides were observed during the first 6 hours of reaction, due to an increase in the molecular weight; longer reaction times yielded adverse results. The temperature dependence of viscosity for all estolides studied is significantly larger than for the original acid oils. KEY-WORDS:Biolubricants -Byproducts -Estolides -High-oleic sunflower acid oil -Olive pomace acid oilThermal analysis -Viscosity.

show abstract

Section: Thermal Characterization Of Acid Oils and Derived Estolidesmentioning

confidence: 99%

Chemical, thermal and viscous characterization of high-oleic sunflower and olive pomace acid oils and derived estolides

García‐Zapateiro¹,

Franco²,

Valencia³

et al. 2013

Grasas y Aceites

Self Cite

View full text Add to dashboard Cite

show abstract

“…As mentioned above, only in the case of chitosan-based oleogels a high degree of functionalization makes possible to reach values of the viscoelastic moduli higher than those displayed by the non-functionalized biopolymer-based oleogel. However, as previously reported [27,42], it must be remarked that these physically stabilized gels present some limitations regarding their physical and mechanical stability, which can be overcome by mean of functionalization. , for NCO-functionalized chitosan-and chitin-based oleogels.…”

Section: Rheology Of Chitosan-and Chitin-based Oleogelsmentioning

confidence: 99%

“…Although vegetable oils are being increasingly used as bio-based lubes, the substitution of traditional thickening agents, such as metallic soaps and polyureas, in lubricating greases by others derived from renewable resources is a much more complicated task. For instance, some limitations regarding physical and mechanical stabilities and thermo-rheological behaviour of previously mentioned cellulosic derivatives-based gel-like dispersions [27][28][29] were pointed out as a consequence of a certain degree of chemical incompatibility between oil and such polar biopolymers. Most of these problems can be overcome by inducing the formation of chemical gels, for instance by dispersing reactive isocyanate-functionalized methylcellulose in the vegetable oil medium [41,42].…”

Section: Introductionmentioning

confidence: 99%

“…However, some biomacromolecules like natural waxes, resins and biopolymers with gelling properties in oily media are gaining special attention [18][19][20][21][22][23][24][25][26]. Among these studies, lignocellulosic materials and cellulose derivatives have been used to obtain gel-like dispersions in vegetable oils, which may be potentially applied as environmentally friendly lubricating grease formulations [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Functionalization Degree on the Rheological Properties of Isocyanate-Functionalized Chitin- and Chitosan-Based Chemical Oleogels for Lubricant Applications

et al. 2014

View full text Add to dashboard Cite

This work deals with the influence of functionalization degree on the thermogravimetric and rheological behaviour of NCO-functionalized chitosan-and chitin-based oleogels. Chitosan and chitin were functionalized using different proportions of 1,6-hexamethylene diisocyanate (HMDI) and subsequently dispersed in castor oil to promote the chemical reaction between the -NCO group of the modified biopolymer and the -OH group located in the ricinoleic fatty acid chain of castor oil, thus resulting in different oleogels with specific thermogravimetric and rheological characteristics. Biopolymers and oleogels were characterized through Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Small-amplitude oscillatory shear (SAOS) measurements were performed on the oleogels. Oleogels presented suitable thermal resistance, despite the fact that the inclusion of HMDI moieties in the polymer structure led to a reduction in the onset temperature of thermal degradation. The insertion of low amounts of HMDI in both chitin and chitosan produces a drastic reduction in the values of oleogel viscoelastic functions but, above a critical threshold, they increase with OPEN ACCESSPolymers 2014, 6 1930 the functionalization degree so that isocyanate functionalization results in a chemical tool to modulate oleogel rheological response. Several NCO-functionalized chitosan-and chitin-based oleogel formulations present suitable thermal resistance and rheological characteristics to be proposed as bio-based alternatives to traditional lubricating greases.

show abstract

“…Although some work concerning biogreases development has been previously carried out by other authors [8][9], it has been mainly focused on the replacement of mineral oil by modification structure of oleic acid. However, the research of new biodegradable grease is up to now much less explored.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of some novel dioxolane compounds from Indonesian essential oils as potential biogreases

Wahyuningsih¹,

Kurniawan²

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Development of new green lubricating grease formulations based on cellulosic derivatives and castor oil

Cited by 79 publications

References 28 publications

Chemical, thermal and viscous characterization of high-oleic sunflower and olive pomace acid oils and derived estolides

Chemical, thermal and viscous characterization of high-oleic sunflower and olive pomace acid oils and derived estolides

Influence of Functionalization Degree on the Rheological Properties of Isocyanate-Functionalized Chitin- and Chitosan-Based Chemical Oleogels for Lubricant Applications

Green synthesis of some novel dioxolane compounds from Indonesian essential oils as potential biogreases

Contact Info

Product

Resources

About