Tribological performance of some polyoxyethylene dithiophosphate derivatives water solutions

Plaza, S.; Margielewski, L.; Celichowski, Grzegorz; Wesolowski, R.W; Stanecka, R.

doi:10.1016/s0043-1648(01)00847-x

Cited by 30 publications

(25 citation statements)

References 4 publications

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“…The results from Boschkova et al [69,70] and Liu [71] also separately indicated that the good film-forming capability of surfactants solutions is contributed to the packing of surfactant molecules at the solid surfaces. Aqueous polymer solutions also exhibit improved lubrication capability and wear resistance in TFL regime, as a result of the adsorbed and structured protective polymer layer on the solid surfaces, such as the poly (L-lysine)-g-poly (ethylene glycol) (PLL-g-PEG) [72], polyethoxyglycol esters of dithiphosphate acid [73], octadecyltrichlorosilane [74] and so on. Liu et al [75] also reported an effective friction reduction by using graphene oxide and diamond nanoparticles as water-based lubricating additives, in which the TFL can be attributed to the lamellar structure and geometric size of the nano additives.…”

Section: Tfl In Aqueous Lubricationmentioning

confidence: 99%

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

2015

Sci. China Technol. Sci.

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Thin film lubrication (TFL) is known as a mode of fluid-film lubrication regime bridging the gap between elastohydrodynamic lubrication (EHL) and boundary lubrication (BL). Since the first recorded literature published in 1995, TFL has become one of the landmarks in the development of lubrication theory over the last twenty years. This article presents an overview of the advances in the research of TFL regime. We first begin with a brief introduction of the discovery of the phenomenon, followed by the discussion of the relevant essential aspects, such as the performing approach, theory and physical model. The state-of-the-art studies on both the theoretical and experimental fields are also presented, also latter with emphasis on the review of researches in several promising applications. thin film lubrication, film thickness, ordered structure, interface Citation:Ma L R, Luo J B. Advances in thin film lubrication (TFL): From discovery to the aroused further researches.

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Section: Tfl In Aqueous Lubricationmentioning

confidence: 99%

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

2015

Sci. China Technol. Sci.

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“…The good lubrication performance is attributed to the strong resistance to interpenetration of compressed brushes, combined with the fluidity of the hydration layers surrounding the charged polymer segments. Plaza et al [76] explored the tribological properties of polyethoxyglycol esters of dithiphosphate acid derivative aqueous solutions using four-ball and ball-ondisk machines. Such solutions showed excellent load-carrying performances and strongly reduced friction coefficients in contrast to pure water.…”

Section: Lubrication Behaviors Of Aqueous Liquids In Confinementmentioning

confidence: 99%

Progress in experimental study of aqueous lubrication

Zhang

Liu

2012

Chin. Sci. Bull.

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Aqueous lubrication is commonly regarded as friendly to the environment. We review current knowledge of the behaviors and mechanisms of aqueous lubrication. Major methods for investigating aqueous lubrication are addressed. We describe studies on both friction and film formation performance of various water-based lubricants. Additionally, we discuss possible underlying mechanisms of aqueous lubrication. Attention is also drawn to continuing topics of investigation and some unsolved problems. [20][21][22], and aqueous lubrication [23][24][25]. Aqueous solutions are drawing attention because of their ecological advantages, fire-resistance, high thermal conductivity, nontoxicity, accessibility, biodegradability, environmental friendliness, and good solvency. However, water-based solutions have several disadvantages as lubricants, such as corrosiveness, vaporization and non-viscosity [26,27]. In the past several decades, aqueous fluids have been extensively used as lubricants in metal working processes, food processing, biological systems etc. Since petroleum will be exhausted within 50 years, aqueous fluids will have wide application in many industrial fields. Thus, research on aqueous fluids has become an important branch of tribology. Use of water-based lubrication in engineering can be traced back to about 2400 BC, when people used water as a lubricant in transporting statues in Egypt [28]. Meanwhile, water-based liquids have always been excellent lubricants in mammalian joints such as knees or hips, with friction coefficients μ< 0.002 [29,30]. Till now this ultra-low friction has not been well emulated in human-made aqueous systems. In contrast to oils and organic solvents, water has many unique properties due to the polarity of its molecules, which makes aqueous lubrication much more complicated than traditional lubrication with oils.Many studies have revealed both the characteristics and mechanisms of aqueous lubricants, with a wide variety of dimensions, conditions and application areas. In spite of the great efforts of both experimentalists and theorists, the study of aqueous lubrication still faces big challenges. As mentioned above, human-made systems seldom emulate natural lubrication well enough for practical use. Major efforts have been made to reduce the friction force of aqueous solutions between two solid surfaces and enhance the film formation ability at the same time. Nanotechnology has made much progress in revealing the underlying mechanisms and behaviors of materials at the nanometer-scale, especially the behaviors of atoms and molecules [31][32][33]. However, the mechanisms of aqueous lubrication are still not well known because of the diversity and complexity of aqueous solutions. This paper presents a general review of research on aqueous lubrication.

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“…The fluorinated ZDDP provides improved wear performance over ZDDP (Somayayi and Aswath, 2008;Parekh et al, 2009). The ashless polyalkoxy glycol dithiophosphoric acid derivatives (PGDPs) were synthesized and tested in tribological systems (Plaza et al, 2001;Plaza and Wesołowski, 2000;Mizerski and Celichowski, 2003;Plaza and Psarski, 2004;Margielewski and Plaza, 2008). The presence of oxygen atoms in polyalkoxy chain of polyalkene glycols improves the AW/EP properties of PGDPs; their thermal stability is higher than ZDDP.…”

Section: Introductionmentioning

confidence: 99%

Preparation and tribological properties of zinc dialkyl(aryl)ethoxy dithiophosphates

Margielewski

Stanecka-Badura

Plaza

et al. 2012

Industrial Lubrication and Tribology

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Purpose -Environmental regulations have called for reduction of phosphorus content in engine oils because this element strongly deactivates the catalyst in automotive catalytic converters. The primary source of phosphorus is zinc dialkyl(aryl)dithiophosphate (ZDDP). Therefore, to protect catalyst ZDDP is replaced with other additives or its amount in engine oil is reduced. Zinc dialkyl(alkylaryl)ethoxy dithiophosphates (ZEDPs), a novel derivative of dithiophosphate additive, soluble in lubricating base oils were synthesized and used to replace containing more phosphorus ZDDP. Design/methodology/approach -Tribological properties of ZEDPs were evaluated using four-ball and the ball-disc tribometers. The ZEDPs thermal stability and worn surface were analysed using TGA, XPS techniques. Findings -ZEDPs significantly reduce the friction and wear under boundary, mixed and hydrodynamic lubrication regimes. Friction and wear properties are dependent on chemical structure of additives, their surface active behavior in tribological system and frictional parameters. The effectiveness of friction and wear reduction increases with the concentration of lubricating oil additive solution and depend on the amount of the additive adsorbed on the surfaces. ZEDPs are much more thermally stable than ZDDPs. The XPS shows that the tribochemical films formed on rubbing surfaces contain zinc and iron phosphates and sulphates.Research limitations/implications -The effect of the number of etoxy groups in ZEDPs molecules on their tribological properties was not investigated. Practical implications -ZEDPs were synthesized and can be a potential replacement for ZDDP. Originality/value -ZEDPs were first investigated in lubrication of steel-steel frictional contact and results indicate that they can be used as additives in combustion engine base oil.

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Tribological performance of some polyoxyethylene dithiophosphate derivatives water solutions

Cited by 30 publications

References 4 publications

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

Progress in experimental study of aqueous lubrication

Preparation and tribological properties of zinc dialkyl(aryl)ethoxy dithiophosphates

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