改性生物柴油碳烟的制备、表征及水基润滑特性

Preparation,Characterization and Water-based Lubricity of Modified Biodiesel Soot

为了探索生物柴油碳烟(BDS)作为水基润滑添加剂的应用,采用热氧化法制备了热氧化处理的BDS(TO-BDS);通过场发射透射电子显微镜、X射线光电子能谱仪和Zeta电位仪等表征了TO-BDS的形貌、组成和分散性,并与BDS进行了对比;利用球-盘往复摩擦磨损试验机、3D激光扫描显微镜、场发射扫描电子显微镜、光学法接触角/界面张力仪和拉曼光谱仪考察了含TO-BDS的纯水(H-32O)的摩擦磨损性能和润滑机理.结果表明,TO-BDS表面的含氧官能团和负电荷比BDS更多,从而导致TO-BDS在H-32O中具有更好的分散性;在H-32O中添加质量分数为0. 2%的TO-BDS,可显著改善H-32O的减摩抗磨性能.这主要是因为在摩擦过程中,TO-BDS起到滚动轴承的功效,H-32O+TO-BDS比H-32O在摩擦副表面的润湿性能更好,更易于形成润滑膜且TO-BDS会因摩擦力诱导剥离产生石墨片,从而降低摩擦磨损.

In order to realize the utilization of biodiesel soot(BDS)as lubricant additives in water,thermally oxidized biodiesel soot(TO-BDS)was prepared by thermal oxidation.The morphology,composition and dispersion of TO-BDS were analyzed by field-emission transmission electron microscopy,X-ray photoelectron spectroscopy and\%zeta\%potentiostat,and compared with that of BDS.The tribological properties and the lubricant mechanism of TO-BDS as an additive in water were investigated using a ball-on-disc reciprocating tribometer,3D laser scanning microscopy,field-emission scanning electron microscopy,optical contact angle/interface tension meter and Raman spectrometer.Results indicate that the oxygen-containing functional groups and negative charges of TO-BDS are more than that of BDS,which leads to better dispersion of TO-BDS in water compared with BDS in water.The anti-friction and anti-wear properties are significantly improved after adding 0.2%(mass fraction)TO-BDS in water.The main reason is that TO-BDS can act as bearing during friction process and water containing TO-BDS is more facile than water to form lubricating film because the friction pairs are more wettable for water containing TO-BDS in comparison with water.Besides,it also can reduce friction and wear due to friction induced the exfoliating graphitic sheets of TO-BDS.