Insights into the rheological behaviors and tribological performances of lubricating grease: entangled structure of a fiber thickener and functional groups of a base oil,New Journal of Chemistry

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Insights into the rheological behaviors and tribological performances of lubricating grease: entangled structure of a fiber thickener and functional groups of a base oil
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7nj04833e
Nan Xu _{1,

2,

3,

4,

5} , Xiaobo Wang _{1,

2,

3,

4,

5} , Rui Ma _{1,

2,

3,

4,

5} , Weimin Li _{1,

2,

3,

4,

5} , Ming Zhang _{1,

2,

3,

4,

5}

Affiliation

Herein, a series of lithium greases, with different thickener concentrations, fibers morphologies, and types of base oil, was synthesized via the saponification reaction. The corresponding rheological behaviors, such as structural strength, structural rearrangement speed, and recoverability, were investigated carefully. Results indicate that greases with higher entanglement levels of thickener fibers display higher structure strength, lower structural rearrangement speed, and lower recoverability. On the other hand, greases with a lower level of entanglement show counter trends. In addition, the structure strength dramatically decreases with a decrease in thickener concentration; this is accompanied by a significant increase in structural rearrangement speed and recoverability. Furthermore, the difference in these rheological behaviors between greases becomes narrow with a decrease in the fiber entanglement level. In addition, the influence of functional groups of base oil on the rheological behaviors was investigated. By introducing base oils with rigid molecular chains (containing ester bond and aromatic ring), the structure strength of lithium greases improved remarkably, especially for greases with a lower entanglement level. Moreover, the results of tribological tests indicate that the lithium greases with a fast structural rearrangement speed display better friction-reducing property in the frequency ramp tests. On the other hand, greases with a higher structure strength display good load-bearing property.

中文翻译：

深入了解润滑脂的流变行为和摩擦学性能：纤维增稠剂的缠结结构和基础油的官能团

本文中，通过以下方法合成了一系列具有不同增稠剂浓度，纤维形态和基础油类型的锂润滑脂皂化反应。仔细研究了相应的流变行为，例如结构强度，结构重排速度和可恢复性。结果表明，高浓度增稠剂纤维缠结的润滑脂显示出更高的结构强度，更低的结构重排速度和更低的可回收性。另一方面，缠结程度较低的润滑脂则显示出相反的趋势。另外，结构强度随着增稠剂浓度的降低而显着降低。这伴随着结构重排速度和可恢复性的显着提高。此外，随着纤维缠结水平的降低，润滑脂之间的这些流变行为的差异变窄。此外，研究了基础油官能团对流变行为的影响。通过引入具有刚性分子链（含酯键和芳环）的基础油，锂润滑脂的结构强度显着提高，特别是对于缠结度较低的润滑脂而言。此外，摩擦学测试的结果表明，结构重排速度快的锂润滑脂在频率斜坡测试中显示出更好的减摩性能。另一方面，具有较高结构强度的润滑脂显示出良好的承载性能。摩擦测试结果表明，结构重排速度快的锂基润滑脂在频率斜坡测试中显示出更好的减摩性能。另一方面，具有较高结构强度的润滑脂显示出良好的承载性能。摩擦测试结果表明，结构重排速度快的锂基润滑脂在频率斜坡测试中显示出更好的减摩性能。另一方面，具有较高结构强度的润滑脂显示出良好的承载性能。

更新日期：2017-12-18

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