Dialkyl Dithiophosphate-Functionalized Ti3C2Tx MXene Nanosheets as Effective Lubricant Additives for Antiwear and Friction Reduction

Taking into account the environmental awareness and ever-growing restrictive regulations over contamination, the study of new lubricants or lubricant additives with high performance and low toxicity over the traditional lubes to reduce the negative impact on the environment is needed. In this chapter, the current literature on the use of ionic liquids, particularly protic ionic liquids, as high-performance lubricants and lubricant additives to different types of base lubricants are reviewed and described. The relation between ionic liquids structures and their physicochemical properties, such as viscosity, thermal stability, corrosion behavior, biodegradability, and toxicity, is elaborated. Friction reduction and wear protection mechanisms of the ionic liquids are discussed with relation to their molecular structures and physicochemical properties.

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FORMULATION OF REFINED, BLEACHED AND DEODORISED PALM STEARIN WITH ZINC DIALKYL-DITHIOPHOSPHATE ADDITIVE AND ITS TRIBOLOGICAL PERFORMANCE

Jurnal Teknologi ◽

10.11113/jt.v78.9655 ◽

2016 ◽

Vol 78 (9-2) ◽

Author(s):

Nurul Farhanah Azman ◽

Syahrullail Samion ◽

Erween Abd Rahim

Keyword(s):

Friction And Wear ◽

Palm Stearin ◽

Optical Microscope ◽

Friction Reduction ◽

Wear Performance ◽

Environmental Friendliness ◽

Zinc Dialkyl Dithiophosphate ◽

The Coefficient Of Friction ◽

Lubricant Base Stock ◽

Dialkyl Dithiophosphate

Vegetable oils have recently received worldwide attention for their use as a lubricant base stock that has numerous advantages, including their environmental friendliness. In this study, a refined, bleached and deodorised palm stearin was selected as the base lubricant, and its friction and wear performance were investigated with a pin-on-disk tribotester. The effect of zinc dialkyl-dithiophosphate (ZDDP) additive in concentrations of 1wt%, 3wt% and 5wt% on friction and wear performance were evaluated. Commercial semi-synthetic oil SAE 15W50 was used for comparison purposes. The experiments were conducted at a sliding speed of 1.5 m/s under a normal force of 9.81 N for 60 min. Results show that an increase in ZDDP concentrations improved both friction reduction and wear performance of the lubricant. The coefficient of friction (COF) of RBD palm stearin was reduced approximately at 71% when 5wt% of ZDDP was added and it shows that the friction reduction performance of PS+5wt% (COF=0.039) was comparable to SAE 15W50 (COF=0.035). While, wear coefficient of RBD palm stearin was reduced significantly from 2.08 × 10−3 to 8.89 x 10−5 when 5wt% ZDDP additive was added and it shows that the wear performance of PS+5wt% was better than that of SAE 15W50, 1.94 x 10−4. Further analysis of the wear worn surface with a high-resolution optical microscope was also conducted with a surface profilometer to examine the metallurgy of the pin surface and the roughness of the pin.

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Triple Function Lubricant Additives Based on Organic–Inorganic Hybrid Star Polymers: Friction Reduction, Wear Protection, and Viscosity Modification

ACS Applied Materials & Interfaces ◽

10.1021/acsami.8b16849 ◽

2018 ◽

Vol 11 (1) ◽

pp. 1363-1375 ◽

Cited By ~ 6

Author(s):

Bas G. P. van Ravensteijn ◽

Raghida Bou Zerdan ◽

Dongjin Seo ◽

Nicholas Cadirov ◽

Takumi Watanabe ◽

...

Keyword(s):

Star Polymers ◽

Lubricant Additives ◽

Friction Reduction ◽

Hybrid Star ◽

Inorganic Hybrid ◽

Wear Protection ◽

Viscosity Modification

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Surface Modification of MoS2 Nanosheets as Effective Lubricant Additives for Reducing Friction and Wear in Poly-α-olefin

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.8b00454 ◽

2018 ◽

Vol 57 (23) ◽

pp. 8105-8114 ◽

Cited By ~ 16

Author(s):

Xinhu Wu ◽

Kuiliang Gong ◽

Gaiqing Zhao ◽

Wenjing Lou ◽

Xiaobo Wang ◽

...

Keyword(s):

Surface Modification ◽

Friction And Wear ◽

Lubricant Additives ◽

Mos2 Nanosheets ◽

Effective Lubricant

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Tribological Properties of Ammonium Protic Ionic Liquids As Additives in Polyalphaolefin for Steel-Steel Contact

Volume 12: Advanced Materials: Design, Processing, Characterization, and Applications ◽

10.1115/imece2019-10645 ◽

2019 ◽

Author(s):

Hong Guo ◽

Patricia Iglesias

Keyword(s):

Ionic Liquids ◽

Friction And Wear ◽

Tribological Behavior ◽

Lubricant Additives ◽

Protic Ionic Liquids ◽

Wear Performance ◽

Different Temperatures ◽

Effective Lubricant ◽

Higher Temperature ◽

Brønsted Base

Abstract Around 23% of the world’s energy consumption results from rubbing contacts, in which 20% is used to overcome friction and 3% is due to wear and the consequent failure. The implementation of lubricants and effective lubricant additives are indispensable to reduce friction and wear of rubbing materials. Protic Ionic Liquids (PILs), which are easily obtained by proton transfer from a Brønsted acid to a Brønsted base, have shown great potential to be used as lubricants due to their structures and tunable properties. In this study, two kinds of novel PILs, bis(2-hydroxyethylammonium) succinate (DSu) and tri-[bis(2-hydroxyethylammonium)] citrate (DCi), were synthesized and tested as lubricant additives. The tribological behavior of the two PILs is studied as additives in 1 wt. % to a base synthetic lubricant (PAO) for steel-steel contact under different temperatures (room temperature and 100°C) and normal loads (3 N and 4 N) using a ball-on-flat reciprocating tribometer. When 1 wt. % of any PILs is added into PAO, friction is reduced compared to that with neat PAO at all temperatures and loads studied, and good anti-wear performance is also obtained under the higher temperature studied. Particularly, 1 wt. % DCi +PAO shows the best high-temperature tribological behavior under 4N, with friction and wear reductions of 33% and 35%, respectively.

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Halogen-free ionic liquids as synthetic ester oil antiwear additives

Industrial Lubrication and Tribology ◽

10.1108/ilt-08-2017-0240 ◽

2018 ◽

Vol 70 (9) ◽

pp. 1590-1600 ◽

Cited By ~ 1

Author(s):

Zeyun Wang

Keyword(s):

Ionic Liquids ◽

Pour Point ◽

Experimental Studies ◽

Lubricant Additives ◽

Friction Reduction ◽

Antiwear Additives ◽

Pour Point Depressant ◽

Content Type ◽

Synthetic Ester ◽

Point Depressant

Purpose This paper aims to investigate the tribological properties of 1,4-bis(2-ethylhexyl) sulfosuccinate anion-based ionic liquids (ILs) when used as lubricant additives in synthetic ester oil. Design/methodology/approach The 1,4-bis(2-ethylhexyl) sulfosuccinate anion-based ILs containing different cation-imidazolium and organo-ammonium were synthesized and characterized. Their tribological performances as lubricant additives were assessed on ball-on-flat tribological tester. Their compatibility with typical additives (such as viscosity improver, antioxidant, pour point depressant and anti-rusting agent) were evaluated on a four-ball friction and wear tester. Findings It was found that the synthesized ILs demonstrated more effective friction reduction and antiwear properties than the base synthetic ester oil. The ILs worked well with the other typical additives, such as viscosity improver, antioxidant, pour point depressant and anti-rusting agent. Originality/value The results of the experimental studies demonstrated the potential of 1,4-bis(2-ethylhexyl) sulfosuccinate anion-based ILs as additives for improving friction reduction and antiwear abilities of synthetic ester oil.

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