EFFECT OF DIFFERENT TYPES OF FATTY ACIDS ON PERFORMANCE OF LITHIUM GREASE

Abstract

Abstract: Preparation of 12-hydroxystearic acid complex lithium grease and stearic acid complex lithium grease containing molybdenum disulfide were conducted through one step method using 12-hydroxystearic and stearic acid as thickener, respectively and 85W-40 heavy-duty vehicle gear oil as base oil. The effects of different types of fatty acids on the properties of lithium complex greases were investigated. The results showed that the lithium complex grease prepared by 12-hydroxystearic acid had higher sintering load, dropping point and thermal stability than the lithium complex grease prepared by stearic acid. Compared with the base grease, when the amount of molybdenum disulfide added to the lithium complex grease prepared from12-hydroxystearic acid was 10%, the load-bearing capacity increased by 96.8%; while for the complex lithium-based grease prepared by stearic acid, the load-bearing capacity increased 100% when the adding amount of disulfide was 15%.

Key words: stearic acid, 12-Hydroxystearic, lithium grease, MoS2

CLC Number:

References

[1]邓颖. 高温润滑脂的制备及性能研究[D].华北电力大学(北京),2017.
DENG Y. Study on High Temperature Grease and Space Grease[D]. North China Electric Power University (Beijing), 2017.
[2]CHO M, CHOI H J. Optimization of surface texturing for contact between steel and ultrahigh molecular weight polyethylene under boundary lubrication[J]. Tribology Letters, 2014, 56(3):409-422.
[3]李祖来, 蒋业华, 周荣,等. Cr的添加对WC p/铁基表层复合材料三体磨料磨损性能的影响[J]. 材料热处理学报, 2014, 35(1):17-21.
LI Z L, JIANG Y H, ZHOU R, et al. Effects of Cr addition on three-body abrasive wear behavior of WC particles reinforced iron substrate surface composites[J]. Cailiao Rechuli Xuebao/transactions of Materials & Heat Treatment, 2014, 35(1):17-21.
[4]YU X, MENG X, JIANG H, et al. Research on lubrication performance of super heavy constant flow hydrostatic thrust bearing[J]. Advanced Science Letters, 2011, 4(8):2738-2741.
[5]STOKES J R, MACAKOVA L, CHOJNICKA-PASZUN A, et al. Lubrication, adsorption, and rheology of aqueous polysaccharide solutions[J]. Langmuir, 2011, 27(7):3474-3484.
[6]DALLAVALLE M, SANDIG N, ZERBETTO F. Stability, dynamics, and lubrication of MoS2 platelets and nanotubes[J]. Langmuir the Acs Journal of Surfaces & Colloids, 2012, 28(19):7393.
[7]ALAZIZI A A, ERYILMAZ O, ERDEMIR A, et al. Effects of nanoscale surface texture and lubricant molecular structure on boundary lubrication in liquid[J]. Langmuir the Acs Journal of Surfaces & Colloids, 2013, 29(44):13419.
[8]CAI M, LIANG Y, ZHOU F, et al. Tribological properties of novel imidazolium ionic liquids bearing benzotriazole group as the antiwear/anticorrosion additive in poly(ethylene glycol) and polyurea grease for steel/steel contacts[J]. Acs Appl.mater.interfaces, 2011, 3(12):4580.
[9]SVAHN F, CSILLAG S. Erratum to: formation of low-friction particle/polymer composite tribofilms by tribopolymerization[J]. Tribology Letters, 2011, 41(3):617-618.
[10] YANG J, LIU Y, YE Z, et al. The effect of plasma nitriding on the tribology of perfluoropolyether grease-lubricated 2Cr13 steel couples in vacuum[J]. Tribology Letters, 2010, 40(1):139-147.
[11]BENJAMIN D. LEONARD, FARSHID SADEGHI, RYAN D. EVANS, et al. Fretting of WC/a-C:H and Cr2N coatings under grease-lubricated and unlubricated conditions[J]. Tribology Transactions, 2009, 53(1):145-153.
[12]于唯,董元虎,贾文,等.复合锂基润滑脂实验室制备工艺研究[J]. 润滑与密封, 2013, 38(1):92-95.
YU W, DONG Y H, JIA W, et al. Study on the processing technology of complex lithium grease in laboratory[J]. Lubrication Engineering, 2013, 38(1):92-95.
[13]CANN P M. Starved grease lubrication of rolling contacts[J]. A S L E Transactions, 1999, 42(4):867-873.
[14]李继泰,胡永明,殷恒波,等.含硅油复合锂基润滑脂的制备及性能研究[J].润滑与密封, 2016, 41(9):74-79.
LI J T, HU Y M, YING H B, et al. Preparation and Performance of Lithium Complex Greases Containing Silicone Oil[J]. Lubrication Engineering, 2016, 41(9):74-79.
[15]沈齐英.可生物降解润滑剂的研究概况[J]. 北京石油化工学院学报, 2011, 19(2):21-26.
SHENG Q Y. A Survey of the Study on Biodegradationable Lubricant[J]. Journal of Beijing Institute of Petro-chemical Technology,2011,19(2):21-26.