沙棘油的提取及摩擦学性能研究

Study on Extraction and Tribological Properties of Green Sea-buckthorn Oil

通过超临界CO_2萃取技术提取沙棘油(SBO),利用热失重分析仪(TGA-DSC)分析其热稳定性,并与高性能的环保专用润滑油荷荷巴油(JO)进行比较;利用MFT-R4000高速复摩擦磨损试验机对比研究沙棘油与荷荷巴油及加入二烷基二硫代氨基甲酸钼(MoDTC)、二烷基二硫代磷酸锌(ZnDTP)添加剂后的摩擦学性能,用光学显微镜(LV150N)和能谱仪(EDS)观察和分析钢块磨斑表面形貌和磨斑表面主要化学元素。结果表明:沙棘油的耐热性能、润滑性能及对MoDTC和ZnDTP添加剂的感受性优于荷荷巴油;沙棘油和MoDTC和ZnDTP复配油润滑下,钢块磨斑表面P和S元素含量相对较高,表明S和P元素在摩擦过程中与摩擦表面发生了摩擦化学反应,生成了磷酸铁和硫化铁等反应膜,提高了摩擦副的抗磨和减摩性能。

Sea buckthorn oil（ SBO） was extracted by supercritical CO_2 extraction,its thermal stability was analyzed by using thermogravimetric analyzer（ TGA-DSC） and was compared with Jojoba oil（ JO,a high-performance and eco-friendly lubricating oil）. The tribological properties of SBO and JO,and their compound oils after adding the additives of Mo DTC and ZnDTP respectively were investigated on a reciprocating friction and wear testing machine of MFT-R4000. The worn surfaces of the lower discs were observed and analyzed by optical microscope（ LV150N） and energy dispersive X-ray spectroscopy（ EDS）. The results reveal that the heat resisting property and lubricating performance of SBO and the sensitivity to additives of Mo DTC and Zn DTP are better than that of JO. Under the lubrication of SBO with additives of Mo DTC and Zn DTP,the worn surface of the lower discs is relatively rich in S and P elements,indicating a friction chemical reaction is occurred between S and P elements and the friction surface during the friction process to form ironic phosphate and ferric sulfate film,which improves the friction reducing and anti-wear properties of frictional pairs.