Environmentally adapted hydraulic oils

Kassfeldt, Elisabet; Dave, Göran

doi:10.1016/s0043-1648(96)07466-2

Cited by 59 publications

(31 citation statements)

References 3 publications

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“…For many reactions, unsaturated double bonds in the fatty acids act as active sites. There are two major problems associated with vegetable oils as functional fluids offer low resistance to thermal oxidative stability (9,(22)(23)(24)(25)(26)(27)(28)(29)(30) and poor low-temperature properties (24,25,29,(31)(32)(33)(34).…”

Section: Introductionmentioning

confidence: 99%

Lubricants from renewable energy sources – a review

Soni

Agarwal

2014

Green Chemistry Letters and Reviews

114

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Lubricant oils are known to decrease the friction coefficient between two contacting surfaces. It is essential for the correct function of almost the totality of mechanical machinery working in the entire world. Lubricant oils consist of about 80% of oily base stocks which attributes to their properties of viscosity, stability, and pour point to the lubricant plus additives supplemented to improve these properties. Petroleum lubricants are usually environmentally unacceptable due to their low biodegradability and toxicity. These oils contaminate the air, soil, and drinking water and affect human and plant life to a great extent. Thus, the demand for environmentally acceptable lubricants is increasing along with the public concerns for a pollution-free environment. Plant oils are promising as base fluid for biolubricants because of their excellent lubricity, biodegradability, viscosity-temperature characteristics, and low volatility. The purpose of this paper is to present a survey of the current status of biolubricating oil. This research provides an overview on the synthesis, tribochemical behavior; the effect of structure on friction/wear, load-bearing capacity, resistance to rise in specimen temperature, and varying response of antiwear/extreme-pressure additives in the presence of vegetable oil/derivative structures has also been discussed. Though a significant number of papers have been published in this area, there is still much to explore. A proper selection of base oil and additives is therefore essential for an efficient synthesis of biolubricating oil.

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Section: Introductionmentioning

confidence: 99%

Lubricants from renewable energy sources – a review

Soni

Agarwal

2014

Green Chemistry Letters and Reviews

114

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“…When utilizing VO, biodegradable lubricant manufacturers face many problems such as insufficient oxidative stability (5)(6)(7)(8), poor corrosion protection (9), or susceptibility to hydrolytic degradation (10). Low-temperature performance often presents a major problem as well (11,12). Petroleum-based hydraulic fluids function satisfactorily at −25°C.…”

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confidence: 99%

“…For purposes of producing biodegradable lubricants with improved low-temperature performance various diluents are often added to VO (11). Lack of fundamental knowledge on crystallization of mixed acid triacylglycerols does not permit more accurate prediction of the PP and other low-temperature properties.…”

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confidence: 99%

Depression of pour points of vegetable oils by blending with diluents used for biodegradable lubricants

Asadauskas

Erhan

1999

J Americ Oil Chem Soc

156

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Low-temperature properties need improvement before vegetable oils can receive wider recognition as biodegradable lubricants. Effects of dilution with major biodegradable fluids, namely poly alpha olefin (PAO 2), diisodecyl adipate (DIDA), and oleates, as well as impact of pour point depressant (PPD), were investigated. Since solidification of mixed unsaturated triacylglycerols is a complex thermodynamic process, the study was limited to pour point determinations. Vegetable oils demonstrated higher pour points with increased saturation and molecular weight. Cis unsaturation and hydroxy groups favored lower pour points. Dilution with oleates appeared less effective than dilution with PAO 2 and DIDA. Addition of 1% PPD (w/w) depressed pour points down to −33°C for canola and −24°C for high-oleic sunflower oils. However, neither higher amounts of PPD nor incorporation of diluent produced further depression. Depression of pour points was not proportional to the amount of diluent and ceased with further dilution. Low-temperature performance of vegetable oils limits their prospect as biodegradable lubricants, but well-balanced usage of PPD and diluents can deliver some improvements.Paper no. J8800 in JAOCS 76, 313-316 (March 1999).

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“…First, rapeseed oil has polarity that leads to its competing absorption with additives on the friction surface, and it can form relatively thick but low shear stress oil film to give a low coefficient of friction [7,8]. Thus, rapeseed oil has a function to reduce friction and wear of the steel-steel sliding system by generating a boundary lubricating film on the steel surface with the assistance of the chemical adsorption [9].…”

Section: Discussionmentioning

confidence: 99%

Study of the tribological behaviors of S, P-containing triazine derivatives as additives in rapeseed oil

Zeng

et al. 2004

Wear

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Environmentally adapted hydraulic oils

Cited by 59 publications

References 3 publications

Lubricants from renewable energy sources – a review

Lubricants from renewable energy sources – a review

Depression of pour points of vegetable oils by blending with diluents used for biodegradable lubricants

Study of the tribological behaviors of S, P-containing triazine derivatives as additives in rapeseed oil

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