Interaction of PIB‐succinimides and other engine oil additives

Bartha, L.; Deák, Gy.; Kovács, Máté; Kocsis, Zoltán; Vuk, T.

doi:10.1002/ls.3010090206

Cited by 10 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results have been reported by Bartha et uZ. 12 The broadening of the original 31P-NMR signal with increasing PIBS concentration reveals clustering of ZDDP around the nitrogen atoms of the polyamine group^.^ The halfbandwidth of the signals (Av) increases from 35 to 850 Hz depending on the nature of the ZDDP alkyl group and chain length, as well as that of PIBS. The broad envelope of signals has been found to move further down-field with increasing concentration of PIBS.…”

Section: Mono-pibs > Bis-pibssupporting

confidence: 85%

molecular spectroscopic studies of ZDDP—PIBS interactions

Kapur

Chopra

Ramakumar

et al. 1998

Lubrication Science

View full text Add to dashboard Cite

The effect of the nature and alkyl chain length of zinc dialkyldithiophosphate (ZDDP) (R = C4 to C8) on its interactions with polyisobutenyl succinimide (PIBS) has been investigated using 31P‐NMR and infrared spectroscopy. 31P‐NMR spectra of ZDDP in the presence of PIBS showed both broad (35–850 Hz) and sharp (50–100 Hz) resonance signals due to different modes of interaction, mainly cluster formation and specific complexation, respectively. Single‐ended mono‐PIBS exhibit stronger interactions compared to the double‐ended bis‐PIBS. The proportion of sharp signals due to specific complexes in 31P‐NMR spectra of ZDDP—PIBS blends are in the order: C8 > C5 > C4+C8 > C6 = aryl ZDDP. The effect of PIBS concentration on the strength of complexes has also been studied.

show abstract

Section: Mono-pibs > Bis-pibssupporting

confidence: 85%

molecular spectroscopic studies of ZDDP—PIBS interactions

Kapur

Chopra

Ramakumar

et al. 1998

Lubrication Science

View full text Add to dashboard Cite

show abstract

“…While there is no report for the interaction between PIBSI and MoDTC, PIBSI and MoDDP (similar structure to MoDTC) have been found to form a complex structure by the electron pairs of the nitrogen of PIBSI and the Mo of MoDDP. , This may explain how PIBSI suspends/disperses MoDTC in oil. In the meantime, PIBSI was also reported to interact/react with ZDDP , and the interaction/reaction largely depends on the chemical structures of both PIBSI and ZDDP. When PIBSI has a stronger interaction/reaction with ZDDP than with MoDTC in fluid, there would be two negative effects: (i) less ZDDP available leading to weaker wear protection and (ii) less PIBSI available to suspend/disperse MoDTC in oil causing agglomeration/precipitation of MoDTC and consequently deteriorated friction behavior.…”

Section: Resultsmentioning

confidence: 99%

“…This observation is contrary to some previously reported synergistic effects for MoDTC and ZDDP working together. 21−24 One reason might be the influence of a dispersant/detergent that had been reported to significantly affect the interactions between MoDTC and ZDDP, 23 and certain dispersants 47,48 including PIBSI 49 could react with ZDDP to cause antagonistic effects. Most literatures 21−23 reporting synergism for MoDTC + ZDDP did not use any dispersant/detergent, and the one 24 that used a dispersant/detergent did not disclose the chemistry.…”

Section: Tribological Behavior Of Different Blendsmentioning

confidence: 99%

“…50,51 This may explain how PIBSI suspends/disperses MoDTC in oil. In the meantime, PIBSI was also reported to interact/react with ZDDP 47,49 1. Compared with the mean COFs, 0.11 and 0.12, and wear volumes, 9.0 × 10 7 and 8.0 × 10 7 μm 3 , for using [N 888 H][DEHP] alone and together with PIBSI in the base oil (see Table S1 and Figure S1), there seems to be a synergistic effect among [N 888 H][DEHP], MoDTC, and PIBSI.…”

Section: Tribological Behavior Of Different Blendsmentioning

confidence: 99%

See 1 more Smart Citation

Ultralow Boundary Lubrication Friction by Three-Way Synergistic Interactions among Ionic Liquid, Friction Modifier, and Dispersant

Liu

Kumara

Luo

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Interactions among antiwear additives (AWs), friction modifiers (FMs), and dispersant in a lubricating oil are critical for tribological performance. This study investigates compatibilities of three oil-soluble ionic liquids (ILs, candidate AWs) with an FM, molybdenum dithiocarbamate (MoDTC), and a dispersant, polyisobutene succinimide (PIBSI) under boundary lubrication. Either synergistic or antagonistic effects were observed depending on the IL’s chemistry. Adding an aprotic phosphonium–alkylphosphate or phosphonium–alkylphosphinate IL into the oil containing MoDTC and PIBSI had detrimental impact on the friction and wear behavior. PIBSI was found to preferably interact/react with the aprotic IL to lose its ability of suspending MoDTC and to partially consume or even deplete the IL. In contrast, a protic ammonium–alkylphosphate IL seemed to be able to coexist with PIBSI and work synergistically with MoDTC, yielding a sustainable, ultralow boundary friction. A three-stage tribochemical process is proposed to explain how this IL + MoDTC pair interacts with the contact surface to form a chemically reacted, wear-protective tribofilm supporting a physically adsorbed, friction-reducing film on top. This study provides fundamental insights of the compatibilities among three common lubricant components, antiwear, friction modifier, and dispersant, which can be used to guide future lubricant development.

show abstract

“…One of the typical examples of the antagonism between additives is between ZnDTP and ashless dispersant in engine oils. A reduction of the load-carrying capability of ZnDTP by the ashless dispersant and the reaction mechanism have been proposed [18,28,29].…”

Section: Introductionmentioning

confidence: 99%

Influence of coexisting functionalized polyalkylmethacrylates on the formation of ZnDTP-derived tribofilm

Matsui

Aoki

Masuko

2016

Tribology International

View full text Add to dashboard Cite

Although zinc dialkyldithiophosphate (ZnDTP) shows supreme antiwear performance by forming a thick polyphosphate-based tribofilm on the friction surface, it has been pointed out that the use of ZnDTP is accompanied by interference from the coexisting dispersant. For the maintenance of the good antiwear performance of ZnDTP when it is used with coexisting polar compounds, the effects of polar compounds on the tribofilm formation of ZnDTP should be clarified. Since the recent demand for minimizing energy consumption recommends applying lower-viscosity oil to reduce the viscous drag, the use of a good viscosity modifier (VM) that improves the temperature-viscosity characteristic of the oil is required. Here we tested several types of functionalized polymethacrylate (PMA)-VMs used with ZnDTP, and we discuss their effect on the tribofilm formation of ZnDTP. We observed that the PMA-series VMs with different functional groups influenced the tribofilm formation of ZnDTP. The amino-group-containing PMA in particular significantly reduced the formation of tribofilm.

show abstract

Interaction of PIB‐succinimides and other engine oil additives

Cited by 10 publications

References 3 publications

molecular spectroscopic studies of ZDDP—PIBS interactions

molecular spectroscopic studies of ZDDP—PIBS interactions

Ultralow Boundary Lubrication Friction by Three-Way Synergistic Interactions among Ionic Liquid, Friction Modifier, and Dispersant

Influence of coexisting functionalized polyalkylmethacrylates on the formation of ZnDTP-derived tribofilm

Contact Info

Product

Resources

About