石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (3): 584-591.doi: 10.3969/j.issn.1001-8719.2020.03.018

• 研究报道 • 上一篇    下一篇

锂基润滑脂稠化剂热氧化机理

刘大军,赵毅,庄敏阳,刘伟,李森燕   

  1. 中国石化 石油化工科学研究院,北京 100083
  • 收稿日期:2019-06-13 修回日期:2019-11-09 出版日期:2020-05-25 发布日期:2020-07-21
  • 通讯作者: 刘大军,男,高级工程师,硕士,从事润滑油脂及添加剂的研究开发工作,E-mail:liudajun.ripp@sinopec.com E-mail:liudajun.ripp@sinopec.com
  • 基金资助:
    中国石油化工股份有限公司课题(ST2018082)资助

Thermal Oxidation Mechanism of Lithium-Based Thickener

LIU Dajin, ZHAO Yi, ZHUANG Min, LIU Wei,LI Senyan   

  1. Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China
  • Received:2019-06-13 Revised:2019-11-09 Online:2020-05-25 Published:2020-07-21

摘要: 为探讨锂基润滑脂稠化剂热氧化机理,以12-羟基硬脂酸锂皂为稠化剂模型化合物,在高温条件下进行热氧化处理,采用扫描电镜、差热、热失重、X光射线衍射、红外、液-质联用等手段检测模型化合物氧化、裂解产物的组成,通过分子模拟计算模型化合物分子中各个键的键能,探讨其热氧化机理;并比较了由氧化前后锂皂模型化合物制得润滑脂的性能。结果发现:12-羟基硬脂酸锂皂热氧化机理与基础油类似,属于自由基反应;氧化最容易发生在12-羟基硬脂酸锂皂分子2和12号位的C-H键上;氧化产物包括中、小分子二元脂肪酸单锂化合物及含有烯烃的醇、酮化合物。

关键词: 润滑脂, 稠化剂, 氧化机理, 自由基, 分子模拟

Abstract: Lithium 12-hydroxystearate soap was used as a model compound of lithium grease thickener and was oxidized at high temperatures. The changes of lubricating grease properties were compared after oxidation of model compounds. The components of oxidation products of model compounds were detected by scanning electron microscopy, differential thermal analysis, thermogravimetry, diffraction, infrared spectroscopy and liquid chromatography-mass spectrometry. The bond energies of model compounds were calculated by density functional theory, and the mechanism of thermal oxidation was analysed.

Key words: grease, thickener, oxidation mechanism, radical; molecular simulation