咪唑螯合硼离子液体的合成、表征及摩擦学性能

发布时间：2018-10-19 15:05

【摘要】：以一类环境友好的螯合硼离子液体为研究对象,合成了4种具有不同烷基直链阳离子中心的螯合硼离子液体C_nMImBScB(n=2,4,6,8);通过核磁共振波谱(NMR)、电耦合等离子体发射光谱(ICP-OES)、热重分析(TGA)和差示扫描量热分析(DSC)等方法对4种螯合硼离子液体进行了结构分析、硼含量测定和热稳定性分析.以聚乙二醇200(PEG200)作为基础油样品,C_nMImBScB(n=2,4,6,8)作为添加剂,采用四球摩擦磨损试验机、扫描电子显微镜(SEM)和能量色散X射线光谱(EDX)分别对油样的减摩抗磨性能、磨斑形貌和磨斑表面元素分布进行了分析和表征.结果表明,C_nMImBScB(n=2,4,6,8)可作为在较宽温度范围内使用的润滑油添加剂,离子液体的低浓度(质量分数1%~2%)添加使PEG200的摩擦性能得到大幅度提高,摩擦系数最大降低58.46%,磨斑直径最大降低20.5%;硼元素沉积到表面参与润滑膜的成膜,磨斑表面碳元素含量的增加也有助于摩擦性能的提高.
[Abstract]:A class of environment-friendly chelate boron ionic liquids were studied. Four kinds of chelated boron ionic liquids (C_nMImBScB) with different alkyl chain cationic centers were synthesized, and four chelates were synthesized by means of (NMR), coupled plasma emission spectroscopy (ICP-OES), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The structure of boron ion liquid was analyzed. Determination of boron content and thermal stability analysis. Using polyethylene glycol 200 (PEG200) as the base oil sample and C_nMImBScB (NC2O4C6H8) as additive, the friction and wear properties of oil samples were studied by means of a four-ball friction and wear tester, scanning electron microscope (SEM) and energy dispersive X-ray spectrum (EDX), respectively. The morphology and distribution of elements on the surface of grinding spots were analyzed and characterized. The results show that C_nMImBScB can be used as a lubricating oil additive in a wide temperature range. The friction properties of PEG200 are greatly improved by adding low concentration of ionic liquids (mass fraction of 1wt%). The friction coefficient is reduced by 58.46 and the diameter of wear spot is decreased by 20.5.The boron element is deposited on the surface of lubricating film, and the increase of carbon content on the surface is also helpful to the improvement of friction performance.
【作者单位】：中国科学院宁波材料技术与工程研究所;上海大学材料科学与工程学院;
【基金】：国家自然科学基金(批准号:21404114) 中国博士后科学基金面上项目(批准号:2014M561797) 浙江省博士后科研项目择优资助项目(批准号:BSH1502162) 宁波市自然科学基金(批准号:2015A610051)资助~~
【分类号】：O645.1

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