Interactions Between a Zinc Dialkylphosphorodithioate and Lubricating Oil Dispersants

Gallopoulos, Nicholas E.; Murphy, Chester K.

doi:10.1080/05698197108983221

Cited by 47 publications

(10 citation statements)

References 2 publications

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“…Strong solution interactions between dispersants of the PIBSA/PAM type and ZDDPs are well documented [48,49]. These interactions are claimed to involve either hydrogen bonding between the -R 2 NH groups of the dispersant (R = H or alkyl) and -P=O, -P=S, -P-O-H and -P-S-H groups of ZDDP and decomposition products [50], or direct bonding of zinc atoms of ZDDP to nitrogen donor ligands [51], the latter carried out with 2,2-bipyridine and N,N-diethylethylenediamine, where isolatable 1:1 complexes are formed.…”

Section: Influence Of Dispersantsmentioning

confidence: 99%

Friction, Wear and the Role of Additives in Controlling Them

Bovington

2009

Chemistry and Technology of Lubricants

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The laws of friction are described. Abrasive, adhesive, contact fatigue and corrosive wear mechanisms are explained. The tribological regime of boundary lubrication is discussed in the context of the Stribeck curve and surface film formation. Physical processes for surface film formation and their properties are examined for oxygen-, nitrogen-, sulphur-, phosphorus, boron, molybdenum-containing organic compounds and ZDDP in particular. ZDDP film formation is discussed in depth and the influence of dispersants described. Interactions between reduced ZDDP levels and molybdenum compounds to maintain wear protection and antioxidancy are considered for the requirements of lower SAPS formulations in future formulations.

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Section: Influence Of Dispersantsmentioning

confidence: 99%

Friction, Wear and the Role of Additives in Controlling Them

Bovington

2009

Chemistry and Technology of Lubricants

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“…The interactions between ZDDP and dispersant have been widely studied [8,9]. These interactions are claimed to involve hydrogen bonding between the -RNHR' groups of the dispersant and AP@O, AP@S, APAOAH and APASAH groups of ZDDP and decomposition products.…”

Section: Introductionmentioning

confidence: 99%

Study of interaction of EP and AW additives with dispersants using XANES

et al. 2005

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The chemical interaction of two kinds of dispersants (bis-succinimide dispersant and borated bis-succinimide dispersant) with four kinds of antiwear (AW) and extreme pressure (EP) additives (zinc dialkyldithiophosphate, dialkyldithiophosphate ester, diphenylphosphate ester and dialkyldithiocarbamate) has been investigated under different contact pressures. The chemical compositions of the tribofilms have been studied by B, N, P and S X-ray absorption near edge structure (XANES) spectroscopy. The N K-edge XANES analysis has been used to follow the reaction pathway of amine and imide functional groups in the dispersants and their interactions with EP and AW additives. It has been found that AW additives react with amine to form amine phosphate at low load. However, at high load, there is a good evidence for the formation of a nitrate phase in the tribofilms, the first direct observation of oxidative dispersant loss in the rubbing contact. On the other hand, EP additives behave differently and in general are less reactive. The B K-edge XANES has been employed to follow the interaction of borated dispersant with the EP and AW additive. In general, boron originally in the trigonal coordination, is converted to a tetrahedral coordination form in the process of tribofilm formation.

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“…Complex formation in the bulk oil and competitive adsorption to the surface were assumed to be the major mechanisms. Formation of a complex, ZnISP[S)(OR),], 2R"H,, was suggested by the results of the refractive indexmeasurement by Heilweil.s Gallopoulos et a 1 4 reported the band intensity changes in infrared spectrums by addition of ashless dispersants to ZDP solutions. Inoue et UP found interaction between ZDP and ashless dispersants depending on the structure of the latter.…”

Section: Introductionmentioning

confidence: 99%

Interaction between zinc dialkyldithiophosphate and amine

Shiomi¹,

Tokashiki²,

Tomizawa³

et al. 1989

Lubrication Science

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This paper reports work on complex formation from ZDP and various aliphatic amines, and their equilibrium states in oil, adsorptivities and antiwear properties are investigated. Complex formation from ZDP and amine was proven by isolation and identification of solid crystals, and various complexes were found from mono‐ and diamines. The complex from monoamine has lower adsorptivity than free ZDP, while the poorer adsorptivity of ZDP/monoamine complex makes its antiwear property worse.

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Interactions Between a Zinc Dialkylphosphorodithioate and Lubricating Oil Dispersants

Cited by 47 publications

References 2 publications

Friction, Wear and the Role of Additives in Controlling Them

Friction, Wear and the Role of Additives in Controlling Them

Study of interaction of EP and AW additives with dispersants using XANES

Interaction between zinc dialkyldithiophosphate and amine

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