Boundary and elastohydrodynamic lubrication studies of glycerol aqueous solutions as green lubricants

Shi, Yijun; Minami, Ichiro; Grahn, Mattias; Björling, Marcus; Larsson, Roland

doi:10.1016/j.triboint.2013.08.013

Cited by 94 publications

(89 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Low-cost glycerol aqueous solutions with a good biocompatibility and low temperature properties have reportedly been applied in multiple fields as a better green lubricant [91]. High molecular weight polyglycerol derivatives, useful as thickening agents for water-based lubricants, are prepared by oxyalkylation of a polyglycerol with ethylene oxide or a mixture of ethylene oxide and propylene oxide [92].…”

Section: Chemical Modification/derivatization Of Vegetable Oilsmentioning

confidence: 99%

“…Glycerol obtained as a co-product in the transesterification process can be converted into biofuels, green additives for water-based lubricants, foods, pharmaceuticals, cosmetics, liquid detergents, antifreeze, and toothpaste by numerous reactions including esterification [87], acetalization [40], oxidation [40], hydrogenolysis [40], internal dehydration, and oxidative carbonylation [40]. Low-cost glycerol aqueous solutions with a good biocompatibility and low temperature properties have reportedly been applied in multiple fields as a better green lubricant [91]. High molecular weight polyglycerol derivatives, useful as thickening agents for water-based lubricants, are prepared by oxyalkylation of a polyglycerol with ethylene oxide or a mixture of ethylene oxide and propylene oxide [92].…”

Section: Chemical Modification/derivatization Of Vegetable Oilsmentioning

confidence: 99%

See 1 more Smart Citation

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

2017

View full text Add to dashboard Cite

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.

show abstract

Section: Chemical Modification/derivatization Of Vegetable Oilsmentioning

confidence: 99%

Section: Chemical Modification/derivatization Of Vegetable Oilsmentioning

confidence: 99%

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

2017

View full text Add to dashboard Cite

show abstract

“…Hence, the tribological properties of triobopairs formed by PEEK and PI composite materials with the Si 3 N 4 ceramic material will be studied in this paper. Water is used as a green lubricant to replace mineral oil and vegetable oil because of its low cost, flame retardancy, easy availability, and environmental friendliness [40]. Some friction and wear experiments of different composite materials under water lubrication have been conducted [41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

et al. 2017

View full text Add to dashboard Cite

Polyether-ether-ketone (PEEK) and polyimide (PI) are two kinds of engineering polymer materials widely used as roller bearing cages and rings under extreme environment because of their noise reduction and corrosion resistance properties. The Si 3 N 4 ceramic is the most common ball bearing material. Many current engineering applications of ball bearings require aqueous lubrication. Therefore, this study presents the aqueous lubrication of tribopairs formed by PEEK and PI material sliding against Si 3 N 4 ceramic. Experimental results show that two tribopairs exhibited the similar tribological properties under the dry condition. Water as a lubricant for the PI-Si 3 N 4 tribopair pairs effectively reduces both friction coefficients by 35.5% and wear rates by 32%. The water absorption of PI induces better tribological properties by changing the tribopair surface properties. In addition, the dimples appearing on the PI tribopair surface under water generate additional hydrodynamic lubrication and further improve the friction properties of surface. The PEEK-Si 3 N 4 tribopair shows similar friction coefficients under two kinds of environments. The wear rates under water are approximately more than two times of that under dry sliding. However, water inhibits the appearance of the crush phenomenon and enhances the carrying capacity of the tribopair. Energy dispersive spectroscopy and X-ray diffraction spectra demonstrate no chemical corrosion. The 3D profiler and SEM morphologies illustrate that the transfer film would be formed from the surface of PEEK under water but hindered under dry friction. Overall, the PI-Si 3 N 4 tribopair exhibits better properties than PEEK under water and is promising for future applications in the bearing industry.

show abstract

“…Another hygroscopic lubricant that generated low friction in full film elastohydrodynamic lubrication is glycerol and its aqueous solutions [51]. Here, it was seen that increasing water content would reduce friction up to a certain level where the friction coefficient started to increase with even higher water content.…”

Section: Resultsmentioning

confidence: 91%

Elastohydrodynamic Performance of a Bio-Based, Non-Corrosive Ionic Liquid

Björling

Bair

et al. 2017

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Abstract:To improve performance of machine components, lubrication is one of the most important factors. Especially for use in extreme environments, researchers look for other solutions rather than common lubricant base stocks like mineral oils or vegetable oils. One such example is ionic liquids. Ionic liquids have been defined as molten salts with melting points below 100 • C that are entirely ionic in nature, comprising both cationic and anionic species. The industrial use of ionic liquids is mostly as solvents, electrolytes, extractants and catalysts. In tribological applications, ionic liquids are mainly studied in boundary lubrication and in pure sliding contacts. In this work, the elastohydrodynamic performance of a bio-based, non-corrosive, [choline][L-proline] ionic liquid is evaluated in terms of pressure-viscosity response, film forming capability and friction. The results show a pressure-viscosity coefficient of below 8 GPa −1 at 25 • C, among the lowest reported for any ionic liquid. The ionic liquid generated up to 70% lower friction than a reference paraffin oil with a calculated difference in film thickness of 11%. It was also shown that this ionic liquid is very hygroscopic, which is believed to explain part of the low friction results, but also has to be considered in practical applications since the water content will influence the properties and thus the performance of the lubricant.

show abstract

Boundary and elastohydrodynamic lubrication studies of glycerol aqueous solutions as green lubricants

Cited by 94 publications

References 30 publications

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

Chemically Modifying Vegetable Oils to Prepare Green Lubricants

Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

Elastohydrodynamic Performance of a Bio-Based, Non-Corrosive Ionic Liquid

Contact Info

Product

Resources

About