过量稠化剂组分对锂基润滑脂微观结构和性能的影响  

Effect of Excess Thickener Components on the Microstructure and Properties of Lithium Greases

作　　者：徐状 蔡浩鹏 王哲[1,2] 王卓群 王晓波 贾倩[1,2] XU Zhuang;CAI Haopeng;WANG Zhe;WANG Zhuoqun;WANG Xiaobo;JIA Qian(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Qingdao Key Laboratory of Lubrication Technology for Advanced Equipment,Qingdao Center of Resource Chemistry and New Materials,Shandong Qingdao 266000,China;Zibo Innovation Center of High-End Synthetic Lubricating Materials,Shandong Zibo 255000,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]青岛市资源化学与新材料研究中心青岛市高端装备润滑技术重点实验室,山东青岛266000 [3]淄博高端合成润滑材料创新中心,山东淄博255000

出　　处：《摩擦学学报（中英文）》2024年第4期542-550,共9页Tribology

基　　金：中国科学院兰州化学物理研究所重点项目(KJZLZD-1)资助。

摘　　要：以不同摩尔比的12-羟基硬脂酸和一水氢氧化锂为稠化剂原材料,设计制备了多种锂基润滑脂.采用傅里叶红外光谱(FT-IR)和扫描电镜(SEM)表征了锂基润滑脂的化学结构和微观形貌.考察了过量的12-羟基硬脂酸或者一水氢氧化锂对锂基润滑脂的微观结构、锥入度、滴点、胶体安定性、机械安定性和流变学性能的影响,阐释了微观结构对其性能的影响机理.结果表明:过量的稠化剂组分对锂基润滑脂微观结构的形成及性能均具有显著影响.12-羟基硬脂酸过量10%时对锂基润滑脂起到结构改善剂的作用,过量的一水氢氧化锂更有利于锂基润滑脂形成螺旋纤维均匀及缠绕程度较高的网状结构;一水氢氧化锂过量或者12-羟基硬脂酸过量10%时制备的锂基润滑脂的稠度较大,胶体安定性较好,结构强度较高.The microstructure of grease is the key factor to determine its performance.The thickener of lithium grease is the main component to form the microfiber of grease and its spatial reticulation structure,and the components of thickener have significant effects on the microstructure of grease.In this paper,the effect of excess thickener components on the microstructure and performance of lithium grease was systematically investigated and the mechanism of the effect was elucidated.In this study,12-hydroxystearic acid(HSA)and lithium hydroxide monohydrate(LiOH H2O)were used as raw materials for lithium grease thickeners,and five lithium greases with different molar ratios of thickener raw materials were designed and prepared.Including Li-LH2(HSA:LiOH H2O=1.0:1.2),Li-LH1(HSA:LiOH H2O=1.0:1.1),Li(HSA:LiOH H2O=1.0:1.0),Li-HA1(HSA:LiOH H2O=1.1:1.0)and Li-HA2(HSA:LiOH H2O=1.0:1.2).The chemical structures of the prepared greases were characterized using Fourier transform infrared spectroscopy(FT-IR),and the characteristic functional groups were analyzed.The microstructure of the five lithium greases was characterized by scanning electron microscopy(SEM).The test results showed that the excess thickener had a significant effect on the microstructure of the lithium greases,and the thickeners of samples Li-LH2,Li-LH1,Li and Li-HA1 were all spiral fibers entangled in a mesh structure.The thickener of sample Li-HA2 was a mixture of fibers and block structure,and did not form a spiral fiber entangled mesh structure,which was due to the excess of more HSA that affected the arrangement of thickener molecules and hindered the formation of thickener fibers and their mesh structure.The effects of microstructure of five lithium greases on their cone penetration,dropping point,colloidal stability,mechanical stability and rheological properties were systematically studied.The results showed that the lithium greases prepared with 20%and 10%excess of lithium hydroxide and 10%excess of HSA had higher consistency,better colloidal stability a

关 键 词：过量稠化剂组分 锂基润滑脂 微观结构 胶体安定性 流变性能 

分 类 号：TH117.2[机械工程—机械设计及理论]