Effect of preparation process on elevated temperature tribological properties of composite polyurea grease
Abstract
Purpose
This paper aims to investigate and prepare the composite polyurea greases with excellent thermal stability and tribological properties.
Design/methodology/approach
In this paper, composite Ba-based (Ba, barium) tetra-polyurea lubricating greases were prepared with two different methods: mixing Ba-based gelatinizer and tetra-polyurea gelatinizer by a physical method; and introducing barium carboxylate into tetra-polyurea molecules by a chemical method. The properties of the products, such as heat stability, water resistance and friction performance, were analyzed with thermogravimetry, water-resistance test and four-ball friction test.
Findings
The results indicated that the products obtained by chemically introducing barium carboxylate into tetra-urea molecules showed better elevated temperature tribological properties, and the disadvantages of the polyurea greases with high temperature hardening were also obviously improved. The cone penetration rate at 180°C for 24 h is only 3 per cent. The friction coefficient can be decreased to 0.44 and the last non-seizure load value was increased from 560 N to 1,120 N without any other additives.
Originality/value
The research is significant because the prepared composite grease showed excellent performances, such as the outstanding thermal stability, water resistance and excellent extreme pressure and anti-wear properties, which may be widely applied in steel, metallurgy, bearings and other industrial fields.
Keywords
Acknowledgements
This work is supported by the National Natural Science Foundation of China (Number 21345004) and the project sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry. We also would like to thank the financial support from the Natural Science Foundation of the National Natural Science Foundation of China (Grant Numbers. 11405014), SuZhou Technology Innovation of Key Industries, Jiangsu Science and Technology Department of China (BY2015043-02), the project sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars and State Education Ministry (SZ2013201). We also would like to thank the Suzhou Huifeng Lubricant Co. Ltd. for the help of measurements.
Citation
Shen, Z., Geng, F., Fan, X., Shen, Z. and Wang, H. (2016), "Effect of preparation process on elevated temperature tribological properties of composite polyurea grease", Industrial Lubrication and Tribology, Vol. 68 No. 5, pp. 611-616. https://doi.org/10.1108/ILT-12-2015-0199
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited