TRIBOLOGICAL PROPERTIES OF PHOSPHORUS AND SULFUR-FREE ADDITIVES IN POLYUREA GREASE

Abstract

Abstract:

Poly α-olefin was used as a base oil to prepare polyurea grease. The properties of phosphorus and sulfur-free organic tungsten and organic molybdenum, sulfurized olefin cotton oil additives in polyurea grease were studied on friction pair of copper disc and steel ball. The reciprocating friction and wear tester was used to evaluate the tribological properties. Scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the worn surfaces of copper. The copper strip tests were also investigated in this article. The results show that the polyurea greases prepared with phosphorus and sulfur-free organic tungsten and organic molybdenum have excellent tribological properties. Among of the additives tested, the organic tungsten is the best, and the results are better than that of the sulfurized olefin cotton oil additive. When the contents of three additives are 2.0%, the friction coefficient and wear width are all the lowest. The corrosion on copper of lubricating greases with phosphorus and sulfur-free additive is lower.

Key words: phosphorus and sulfur-free additives, polyurea grease, friction and wear, organic tungsten, organic molybdenum

References

[1] Washo. M. Prictional Characteristics of Greased Rolling Contact Bearing [J]. NLGI Spokesman, 1994，(11)：456-462. [2] 姚立丹，杨海宁，王平. 脲基润滑脂的研究与应用[J]. 石油炼制与化工，2006，37(2)：52-56. [3] 郭小川，蒋明俊，施航，等. 预制稠化剂法制备聚脲润滑脂的研究[J]. 石油炼制与化工，2012，43(2)：71-75. [4] 马丽，何少飞. 聚脲润滑脂复合添加剂的研制[J]. 合成润滑材料，2009，36(1)：15-16. [5] 刘磊，孙洪伟. 聚脲润滑脂的研究进展[J]. 化工进展，2009，28(1)：51-54. [6] 欧阳平，陈国需，李华峰. 传统润滑油抗磨剂的研究趋势[J]. 润滑与密封，2006，(6)：165-167. [7] 张遂心，王晓波，赵改青等. 硼酸盐在聚脲润滑脂中摩擦学性能的研究[J]. 润滑与密封，2010，35(11)：77-81. [8] 程亚洲，徐玉福，胡献国等. 脲基润滑脂中MoS2纳米片的摩擦学性能[J]. 石油学报(石油加工)，2011，27. [9] Baum M W. High viscosity index pao with polyurea thickeners in grease compositions: US, US20090247441A1 [P]. 2009-10-01. [10] 李雪梅，杨义勇. 硼类化合物极压抗磨润滑油添加剂的研究进展[J]润滑与密封，2006，31(9)：197-205. [11] 石琛，毛大恒，盛丽萍．二辛基二硫代氨基甲酸钨的抗磨性和作用机理[J]. 石油学报(石油加工)，2009，25(6)：812-818. [12] 李星亮，岳文，王成彪等. 无硫磷有机钨添加剂作用下离子渗氮轴承钢的摩擦学性能[J]. 石油学报(石油加工)，2012，28(2)：338-344. [13] 郭志光，刘维民. 新型无硫、磷有机钼化合物润滑油添加剂对钢／钢摩擦副摩擦磨损性能影响研究[J]. 摩擦学学报，2006，26(2)：97-101. [14] 夏延秋，张钰，马先贵等. 高性能蜗轮蜗杆油的研制[J]. 润滑与密封，2000，(2)：31-32. [15] 欧阳平，陈国需. 新型无硫磷含氮杂环润滑添加剂的制备及其抗磨减摩性能[J]. 石油学报(石油加工)，2010，26.