Natural Garlic Oil as a High-Performance, Environmentally Friendly, Extreme Pressure Additive in Lubricating Oils

Li, Weimin; Jiang, Cheng; Chao, Mianran; Wang, Xiaobo

doi:10.1021/sc400462n

Cited by 66 publications

(33 citation statements)

References 26 publications

(32 reference statements)

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“…Additives prepared from vegetable oils showed excellent tribological properties and performed well at extreme pressures. 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.…”

Section: Introductionmentioning

confidence: 99%

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

2017

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Chemically modifying vegetable oils to produce an alternative to petroleum-based materials is one of the most important emerging industrial research areas today because of the adverse effects of petroleum products on the environment and the shortage of petroleum resources. Biolubricants, bioplasticizers, non-isocyanate polyurethanes, biofuel, coating materials, biocomposites, and other value-added chemicals can easily be produced by chemically modifying vegetable oils. This short review discusses using vegetable oils or their derivatives to prepare lubricants that are environmentally safe. Chemically modified vegetable oils are generally used as base fluids to formulate environmentally friendly lubricants. Reports of their application as sustainable additives have attracted special attention recently because of their enhanced multifunctional performances (single additives perform several functions, i.e., viscosity index improver, pour point depressant, antiwear products) and biodegradability compared with commercial additives. Here, we have reviewed the use of chemically modified vegetable oils as base fluids and additives to prepare a cost-effective and environmentally friendly lubricant composition.

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Section: Introductionmentioning

confidence: 99%

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

2017

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“…[6][7][8] Moreover, despite that additives are usually included in small proportions, special attention has been also paid on the development of green multifunctional additives for lubricant formulations in order to improve specific properties of vegetable oil-derived base oils, such as viscosity index, pour point, thermo-oxidative stability, lubricity, anti-wear and detergent dispersant capacity. [9][10][11][12][13][14][15] Therefore, a wide range of alternatives to design efficient liquid lubricant products completely based on renewable resources are available in the existing literature. A major complexity involves the formulation of semi-solid lubricants, i.e.…”

Section: Introductionmentioning

confidence: 99%

Gel-Like Dispersions of HMDI-Cross-Linked Lignocellulosic Materials in Castor Oil: Toward Completely Renewable Lubricating Grease Formulations

Gallego

Arteaga

Valencia

et al. 2015

ACS Sustainable Chem. Eng.

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In this work several lignocellulose pulps from different origin and/or submitted to different treatments were crosslinked with hexamethylene diisocyanate (HMDI) and further dispersed in castor oil in order to obtain gel-like formulations based on renewable resources, which can be potentially applicable as semi-solid lubricants. The rheological and tribological properties attained as well as physical and mechanical stability were suitable to consider these gel-like dispersions as efficient alternatives to traditional lubricating greases. The rheological behavior was evaluated by means of both small-amplitude oscillatory shear tests (SAOS) and viscous flow measurements, at different temperatures. The HMDI/cellulose pulp weight ratio applied in the crosslinking reaction can be used to modify and modulate the consistency and the values of rheological functions of these gel-like dispersions. However, the rheological behavior is not qualitatively affected by the amount of HMDI used as coupling agent. The thermo-rheological response evidences a softening temperature of around 100ºC. Mechanical stability of HMDIcrosslinked lignocellulose-based oleogels, evaluated as the loss of consistency after submitting the sample to a working test, was significantly improved respecting the non-crosslinked lignocellulose gel-like dispersion. Microstructural morphology was examined using the atomic force microscopy (AFM) and consist of long and entangled fibers, extremely similar to that found in lithium greases. Moreover, friction coefficient and resulting wear mark diameters obtained in a ball-on-disc contact lubricated with these eco-friendly formulations were, in most cases, comparable to that obtained with commercial lubricating greases. Therefore, HMDIcrosslinked lignocellulose materials are proposed as effective and promising eco-friendly thickener agents in vegetable oils.

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“…While apart from EP properties that are beneficial to both the metal and the oil, due to less of an opportunity to transform into sulfur oxides [3,4], organosulfur compounds, such as sulfurized isobutene (SIB), pose much less of an environmental threat than the more often used commercial additives such as zinc dialkyldithiophosphates (ZDDPs) [5]. Therefore, organosulfur compounds [6] is still promising formulation in lubricant In recent years, titanium complex grease has been extensively used as lubricant owing to its outstanding combined properties, such as high drop point, good wear resistance, superior load-carrying ability, low pollution and good compatibility with mating surfaces [7,8]. Many investigations have been done to further improve its performance using various additives.…”

Section: Introductionmentioning

confidence: 99%