Chemistry of Antiwear Films from Ashless Thiophosphate Oil Additives

Najman, M.N.; Kasrai, M.; Bancroft, G.M.

doi:10.1023/b:tril.0000032448.77085.f4

Cited by 81 publications

(89 citation statements)

References 16 publications

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“…As one of the most used additives of lubricating oil [16][17][18][19][20][21][22][23][24], phosphate can be used to make an ionic liquid possessing both excellent lubrication/anti-wear characteristics and no corrosion issue to metallic friction pairs if phosphate could be modified by being coordinated with some cations that cannot be easily hydrolyzed. Inspired by this idea, a series of ionic liquids consisting of phosphate anions and alkylimidazolium cation were synthesized, and the tribological properties of these ionic liquids as lubricants were studied as well.…”

Section: Introductionmentioning

confidence: 99%

Tribological Characteristics of Alkylimidazolium Diethyl Phosphates Ionic Liquids as Lubricants for Steel–Steel Contact

Zhang

Duan

2009

Tribol Lett

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Tribological properties of three novel phosphates-based ionic liquids (ILs), i.e., 1,3-diethyl imidazolium diethylphosphate, 1-ethyl-3-butyl imidazolium diethylphosphate, and 1-ethyl-3-octyl imidazolium diethylphosphate, were evaluated as lubricants for the steelsteel sliding pair by using an Optimol-SRV oscillating friction and wear tester. The chemical compositions of the boundary films generated on steel contact surfaces were analyzed with the use of a scanning electron microscope (SEM) with a Kevex energy dispersive X-ray analyzer attachment (EDS), and an X-ray photoelectron spectrometer (XPS). The results showed that these phosphate functional group-containing ionic liquids exhibit excellent tribological performance especially at a moderate temperature. The imidazole phosphate ionic liquid has no corrosion to steel. The mechanism for the friction-reduction and anti-wear effect of ionic liquids has also been proposed and discussed from the tribochemistry point of view.

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Section: Introductionmentioning

confidence: 99%

Tribological Characteristics of Alkylimidazolium Diethyl Phosphates Ionic Liquids as Lubricants for Steel–Steel Contact

Zhang

Duan

2009

Tribol Lett

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“…metal-free) additives, such as organosulfur compounds [6], phosphates [6][7][8][9][10][11][12][13][14][15][16], amine phosphates [12], phosphites [11,[17][18][19], phosphorothionates [12][13][14][20][21][22][23][24][25][26], and dithiophosphates [12,21,22,24].…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

2009

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Investigating the thermo-oxidative reactivity of anti-wear additives in lubricant oil solution at high temperature can significantly contribute to an understanding of the mechanism of thermal film and tribofilm formation on metal surfaces. In this study, the reactivity of triphenyl phosphorothionate (TPPT) in lubricant oil solution at high temperature (423 and 473 K) has been studied by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The results show that the TPPT molecule was highly thermally stable and did not completely decompose in oil solution even upon heating at 423 K for 168 h and at 473 K for 72 h. The degradation of the TPPT molecule, which turned out to be a first-order reaction, started taking place after 6 h at both temperatures, leading to the breakage of the P=S bond with the formation of triphenyl phosphate. During these heating experiments, no oil-insoluble compounds were detected. The oxidation of the base oil as a result of the prolonged heating demonstrated that the TPPT molecule did not effectively act as oxidation inhibitor.

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“…Najman et al (102)(103)(104) have investigated that diaryl phosphate, triaryl phosphate, amine phosphate, dialkyl dithiophosphate, and triphenyl phosphorothionate show potential as extreme-pressure and antiwear additives. Camenzind et al (107) showed that an ashless acidic dialkyl dithiophosphate has superior antiwear performance with high resistibility to oxidation and hydrolysis.…”

Section: Synthesis Of Additives For Biolubricating Oilsmentioning

confidence: 99%

Lubricants from renewable energy sources – a review

Soni

Agarwal

2014

Green Chemistry Letters and Reviews

105

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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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Chemistry of Antiwear Films from Ashless Thiophosphate Oil Additives

Cited by 81 publications

References 16 publications

Tribological Characteristics of Alkylimidazolium Diethyl Phosphates Ionic Liquids as Lubricants for Steel–Steel Contact

Tribological Characteristics of Alkylimidazolium Diethyl Phosphates Ionic Liquids as Lubricants for Steel–Steel Contact

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

Lubricants from renewable energy sources – a review

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