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首页> 外文期刊>ACS applied materials & interfaces >Halogen-Free Bis(imidazoIium)/Bis(ammonium)-Di[bis(salicylato)borate] Ionic Liquids As Energy-Efficient and Environmentally Friendly Lubricant Additives
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Halogen-Free Bis(imidazoIium)/Bis(ammonium)-Di[bis(salicylato)borate] Ionic Liquids As Energy-Efficient and Environmentally Friendly Lubricant Additives

机译：无卤双（咪唑）/双（铵）-二[双（水杨酸根）硼酸酯]离子液体作为节能环保型润滑油添加剂

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摘要

Bis(imidazplium)- and bis(ammonium)-di[bis- (salicylato)borate] ionic liquids with variable alkyl chain and cyclic ring structures, were synthesized and then evaluated them as potential lubricant additives. The copper strip test results revealed noncorrosive properties of these ionic liquids. Introduction of halogen content in bis(imidazolium) ionic liquid by replacement of bis(salicylato)borate (BScB) anion with hexafluorophosphate (PF_6~-), severely corroded the copper strip. Thermogravimetric results showed that bis- (imidazolium) ionic liquids exhibited higher thermal stability than bis(ammonium) ionic liquids owing to compact structure provided by imidazolium rings, higher intermolecular interactions, smaller free volume and low steric hindrance. The lubrication properties of these ionic liquids as additives to synthetic lubricant poly(efhylene) glycol (PEG 200) were evaluated for steel balls. Results showed that bis(ammonium)- and bis(imidazolium)-(BScB)2 ionic liquids as additives significantly reduced both friction coefficient and wear of PEG 200. The structure of cations, particularly the variation in substituted alkyl chain length monitored the degree of reduction in friction and wear. The excellent lubrication properties were attributed to the formation of adsorbed tribo-thin film and tribochemical product during the tribo-contact. Being halogen-, phosphorus-, and sulfur-free, these ionic liquids (a) protects contact surfaces from tribo-corrosive events, (b) reduces the friction and wear, and (c) keep environment green and clean.
机译：合成了具有可变烷基链和环状结构的双（咪唑）-和双（铵）-二[双-（水杨基氨基）硼酸酯]离子液体，然后将其评估为潜在的润滑剂添加剂。铜带测试结果表明这些离子液体的非腐蚀性。用六氟磷酸根（PF_6〜-）取代双（水杨酸根）硼酸根（BScB）阴离子引入双（咪唑鎓）离子液体中的卤素含量，严重腐蚀了铜带。热重分析结果表明，由于咪唑环具有致密的结构，较高的分子间相互作用，较小的自由体积和较低的位阻，双（咪唑）离子液体比双（铵）离子液体具有更高的热稳定性。对钢球评估了这些离子液体作为合成润滑剂聚（乙烯）二醇（PEG 200）的添加剂的润滑性能。结果表明，作为添加剂的双（铵）-和双（咪唑鎓）-（BScB）2离子液体显着降低了PEG 200的摩擦系数和磨损。阳离子的结构，特别是取代烷基链长的变化，监控了PEG 200的程度。减少摩擦和磨损。优异的润滑性能归因于在摩擦接触过程中吸附的摩擦薄膜和摩擦化学产物的形成。这些离子液体不含卤素，磷和硫，（a）保护接触表面免受摩擦腐蚀事件的影响;（b）减少摩擦和磨损;（c）保持环境的绿色清洁。

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