Tribological performance of poly(sodium 4‐styrenesulphonate) as additive in water–glycol hydraulic fluid

Abstract

The tribological behaviour of poly(sodium 4-styrenesulphonate) (PSS) as additive in the base fluid of waterglycol hydraulic fluid was evaluated with four-ball machine and Optimol SRV-IV (Optimol Instruments, Munich, Germany) oscillating friction and wear tester, and its viscosity-enhancing performance was also investigated. The results show that PSS exhibits excellent friction-reducing and anti-wear properties in the base fluid and can significantly improve the latter's welding load and viscosity. The worn surfaces were characterised by scanning electron microscope and X-ray photoelectron spectroscopy. The analytical results of typical elements on the worn surfaces demonstrate that PSS molecules adsorb on the rubbing surface and form a stable chemically absorbed film through the interactions between the sulphonate anions and surface metallic atoms during the sliding process, which contributed to improve the tribological properties of the base fluid.

Tribological behaviour of protic ionic liquids with ammonium salts modified LABSA as lubricants and additives

“…This phenomenon also demonstrated the S element in the sulfonate anions is relative weak active so that it could not facilely react with the metal surface to form the effective tribofilm and then enhance the extreme pressure property as additives. The weak peak of 168.2 could be attributed to chemical absorption of the sulfonate anions. Therefore, the tribology performance of the 12A‐LABSA and 18A‐LABSA could be attributed to both synergism of the strongly absorption mechanism of sulfonate anions and the decomposition mechanism of protic ammonium salts in the molecule structure during sliding process.…”

“…Therefore, protic ILs with ammonium salts based on sulfonates could behave good miscibility with conventional oils other than immidazolium‐based ILs with BF 4 or PF 6 . Simultaneously, poly (sodium 4‐styrenesulfonate) has recently been found to be an excellent friction‐reducing (FR) and AW additive in water–glycol hydraulic fluid, due to strongly chemically absorbed film by sulfonate anion on metal surfaces in sliding parts. Since the molecules contain the sulfonate anion and N cation, protic ILs with amine salts based on sulfonates likely have much strongly polarity and should easily be adsorbed on the sliding surface to behave excellence tribology performance.…”

“…Thus, as continuing studies in our group, linear alkylbenzene sulfonic acid (LABSA), which is the precursor to the overbased calcium sulfonate detergents with alkyl groups having typically 17–22 carbon atoms, and two commercial easy accessing amines were used to synthesise protic ILs with ammonium salts in this paper. The tribological properties of the synthetic compounds as lubricants and additives were evaluated with SRV‐I oscillating reciprocating friction and wear tester.…”

Synthesis of water-soluble Cu nanoparticles and evaluation of their tribological properties and thermal conductivity as a water-based additive

“…In the past, many reports on nanoparticles as lubricating additives have focused on oil-based lubricating additives, and the research on nanoparticles as water-based lubricating additives is scant. Furthermore, most nanoparticles that have been reported as additives in water-based lubricants are oil-soluble nanoparticles (the oil-soluble nanoparticles are first dissolved in mineral oil; thereafter, the nanoparticles are transferred to water using a certain amount of surfactant, but the tribological properties are poor because of its poor solubility) or oil-soluble nanoparticles surface-modified using complex methods to obtain water-soluble nanoadditives (cannot be used universally because of its complex composition) [9][10][11]. However, complex nanoparticles, when used as waterbased lubricant additives, have many shortcomings such as a complex composition, relatively poor stability, and easy precipitation.…”

Preparation of Cu@SiO2composite nanoparticle and its tribological properties as water‐based lubricant additive

“…However, water has the characteristic of low viscosity and strong corrosiveness, which is not suitable for most practical tribological applications . In order to get rid of these drawbacks, many researchers have made great efforts to develop polymers, functional small molecules and nanoparticles as water‐dispersible additives . In this respect, small‐sized nanoparticles with special physical and chemical properties may exhibit particular significance.…”