Facile Preparation and Tribological Properties of Water-Based Naphthalene Dicarboxylate Ionic Liquid Lubricating Additives

Desuo Yang, Xin Du, Wenqian Li, Yunyan Han, Lin Ma, Mingjin Fan, Feng Zhou, Weimin Liu

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Taking 1,4-naphthalene dicarboxylic acid (1,4-ND), 2,3-naphthalene dicarboxylic acid (2,3-ND) and tetrabutyl ammonium hydroxide (N4444OH), tetrabutyl phosphonium hydroxide (P4444OH) as raw materials, water-based lubricant additives tetrabutyl ammonium 1,4-naphthalene dicarboxylate (1,4-NDN4444), tetrabutyl phosphonium 1,4-naphthalene dicarboxylate (1,4-NDP4444), tetrabutyl ammonium 2,3-naphthalene dicarboxylate (2,3-NDN4444), and tetrabutyl phosphonium 2,3-naphthalene dicarboxylate (2,3-NDP4444) were prepared in aqueous solution. The additives are not only simple to prepare, but also have good solubility in water. More importantly, they can significantly improve the friction reducing and anti-wear performances of water. On account of the mechanism analysis, it is estimated that the introduction of aromatic ring and more carboxyl groups to the additives play an important role for them to form stable lubrication protective films during the friction process and then to achieve excellent lubrication performance on steel/steel, copper/steel, and aluminum/steel friction pairs. Remarkably, the performances of 2,3-NDN4444 and 2,3-NDP4444 are superior to those of 1,4-NDN4444 and 1,4-NDP4444, which is ascribed to their stronger adsorption on the metal surfaces contributed by the two adsorption targets (two –COO groups). For 1,4-NDN4444 and 1,4-NDP4444, there is only one –COO group that can be simultaneously adsorbed on the metal surfaces from the perspective of space configuration. It weakens the adsorption and decreases the effectiveness of the lubrication protective films resulting in the reduced friction reducing and anti-wear properties of 1,4-NDN4444 and 1,4-NDP4444. Graphical Abstract: Water-based lubricant additives tetrabutyl ammonium 1,4-naphthalene dicarboxylate (1,4-NDN4444), tetrabutyl phosphonium 1,4-naphthalene dicarboxylate (1,4-NDP4444), tetrabutyl ammonium 2,3-naphthalene dicarboxylate (2,3-NDN4444) and tetrabutyl phosphonium 2,3-naphthalene dicarboxylate (2,3-NDP4444) were prepared in aqueous solution. The additives are not only simple to prepare, but also have good solubility in water. More importantly, they can significantly improve the friction reducing and anti-wear performances of water. Evolution of the friction coefficients (a) and wear volume losses (b) for different samples on steel/steel friction pairs. [Figure not available: see fulltext.].

Original languageEnglish
Article number84
JournalTribology Letters
Volume68
Issue number3
DOIs
StatePublished - 1 Sep 2020
Externally publishedYes

Keywords

  • Additive
  • Naphthalene dicarboxylate
  • Tribological property
  • Water-based lubricant

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