The influence of mechanical shearing on the thickener microstructure and properties of Polyurea greases

被引：0

作者：

Ding, Peng ^{[1
,3
]}

Cao, Wenhui ^{[1
]}

Ding, Qi ^{[1
]}

Liu, Chaobin ^{[4
]}

Yu, Wei ^{[2
]}

Hu, Litian ^{[1
]}

机构：

[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China

[2] Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China

[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100039, Peoples R China

[4] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Ctr Adv Lubricat & Seal Mat, Xian 710072, Shaanxi, Peoples R China

来源：

TRIBOLOGY INTERNATIONAL | 2025年 / 208卷

基金：

中国国家自然科学基金;

关键词：

Polyurea greases; Mechanical shearing; Microstructure; Rheological properties; Lubrication; FILM THICKNESS; TEMPERATURE; UREA;

D O I：

10.1016/j.triboint.2025.110655

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Polyurea (PU) greases have found widespread applications in harsh working conditions. While the influence of PU molecule and thermal treatment condition on the microstructure and properties of PU greases has been well elucidated, the impact of mechanical shearing remains unclear. This study explored how mechanical shearing during production affects the structure and properties of PU grease made from octylamine and 4,4 '-diphenylmethane diisocyanate. It was found that static heat treatment leads to nanotube structures, while stirred heat treatment creates twisted fibers. Shearing flow is shown to influence the formation of these structures. The nanotube PU grease has lower consistency and better lubrication for high-speed conditions, while the twisted fiber grease offers higher consistency and stability, suited for boundary lubrication.

引用

页数：11

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