二烷基二硫代磷酸镧的合成及在润滑脂中的性能研究  

INVESTIGATION ON SYNTHESIS OF LANTHANUM DIALKYLDITHIOPHOSPHATE AND ITS PERFORMANCE IN LUBRICATING GREASES

作　　者：张芷薇 司润生 李义雅 何懿峰 Zhang Zhiwei;Si Runsheng;Li Yiya;He Yifeng(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油炼制与化工》2024年第8期113-119,共7页Petroleum Processing and Petrochemicals

摘　　要：以正辛醇与五硫化二磷及硝酸镧为主要原料,制备了二烷基二硫代磷酸镧(LaDDP),采用红外光谱、核磁共振波谱等进行结构表征,并将其添加到以500N为基础油、硬脂酸锂为稠化剂制备的基础脂中。对添加LaDDP的基础脂滴点、锥入度、钢网分油、极压抗磨性、氧化安定性等性能进行测试,同时考察了二烷基二硫代磷酸锌(ZDDP)添加到基础脂时的同类性能。结果表明,LaDDP能够有效地提高润滑脂的氧化安定性,且在极压抗磨性和胶体安定性方面优于ZDDP。通过分子模拟计算模型化合物LaDDP分子中活性位点键能,并推测LaDDP在摩擦过程中发挥极压抗磨作用的机理。Lanthanum dialkyldithiophosphate(LaDDP)was synthesized by using n-octanol,phosphorus pentasulfide and lanthanum nitrate as the primary raw materials.The structure of LaDDP was characterized by infrared spectroscopy(IR)and nuclear magnetic resonance spectroscopy(NMR).LaDDP was added into the base grease prepared with 500N base oil and lithium stearate as thickener,and the performances of grease such as dropping point,penetration,oil separation(steel mesh method),extreme pressure,anti-wear properties and oxidation stability were tested.Moreover,the performance of LaDDP was compared with that of zinc dialkyldithiophosphate(ZDDP)when added to the same base grease.The results indicated that LaDDP significantly improved the oxidation stability of the base grease,and it is superior to ZDDP in terms of extreme pressure and colloid stability.These results demonstrated the potential of LaDDP as an effective additive for enhancing the performance of lubricating grease.The bond energy of the active site in the model compound LaDDP was calculated by molecular simulation,and the mechanism of extreme pressure and anti-wear properties of LaDDP in the friction process was speculated.

关 键 词：二烷基二硫代磷酸镧 润滑脂 极压抗磨 分子模拟 

分 类 号：TE624.83[石油与天然气工程—油气加工工程]