矿井提升钢丝绳改性氧化石墨烯润滑油减摩特性研究
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针对恶劣提升工况下润滑失效导致的提升钢丝绳内部钢丝摩擦磨损严重的问题，开展改性氧化石墨烯润滑油减摩特性研究. 首先，制备十八胺官能化氧化石墨烯(ODA-GO)及其水合肼还原材料(ODA-rGO)，分析其化学结构、表面形貌、片层间距和缺陷，探究其在钢丝绳润滑油IRIS中的分散性；接着，用四球机评价改性润滑油的减摩抗磨性能并研究其润滑机理；最后，评判ODA-GO改性油对钢丝减摩的改进效果. 结果表明：ODA通过酰胺化反应和亲核取代反应接枝在GO表面，ODA-GO拥有高接枝密度的十八烷基链，并在IRIS中分散性较好，ODA-rGO则相反，但在最优添加量下ODA-rGO的抗磨减摩性优于ODA-GO；改性石墨烯基材料会附着在摩擦接触表面，并填补已损伤区域，从而减少磨损；ODA-GO改性油使钢丝间摩擦系数降低10%，疲劳磨损显著降低.
Aiming at the severe friction and wear issue of internal steel wires in hoisting steel ropes caused by lubrication failure under harsh hoisting conditions, this study focuses on the friction-reducing characteristics of modified graphene oxide lubricating oils. Firstly, octadecylamine-functionalized graphene oxide (ODA-GO) and its hydrazine hydrate-reduced derivative (ODA-rGO) were synthesized. Their chemical structures, surface morphologies, interlayer spacings and defects were characterized, and their dispersibility in the hoisting rope lubricant IRIS was investigated. Subsequently, the friction-reducing and anti-wear performance of the modified lubricating oils was evaluated using a four-ball tester, and the lubrication mechanism was explored. Finally, the improvement effect of ODA-GO modified lubricating oil on friction reduction between steel wires was assessed. The results show that: ODA is grafted onto the surface of GO via amidation and nucleophilic substitution reactions; ODA-GO possesses octadecyl chains with high grafting density and exhibits good dispersibility in IRIS, while ODA-rGO shows the opposite trend. However, at the optimal additive dosage, the anti-wear and friction-reducing performance of ODA-rGO is superior to that of ODA-GO. The modified graphene-based materials can adhere to frictional contact surfaces and fill the damaged areas, thereby reducing wear. The ODA-GO modified lubricating oil reduces the friction coefficient between steel wires by 10%, and significantly mitigates fatigue wear.
