A preparation method of porous surface nitrile butadiene rubber with low friction coefficient under water lubrication condition by salt leaching. Issue 23 (16th February 2021)

• Record Type: Journal Article
• Authors: Jin, Da; Xiao, Ke; Han, Yanfeng; Xiang, Guo; Zhou, Zhen; Wang, Jiaxu
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 23(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-02-16
• Subjects: applications -- rubber -- surfaces and interfaces; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.50555
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: Nitrile butadiene rubber is widely used in water‐lubricated bearings due to its excellent performance. Generally, the friction coefficient of water‐lubricated rubber bearings typically between 0.05 and 0.18. In this study, a new method for preparing nitrile butadiene rubber with micro‐holes surface is developed by porous leaching with salt as pore forming agent. The possibility of using porous surface to minimize friction and wear of rubber materials is researched. The influence of structural parameters, including the hole density and size (which are determined by salt mass fraction of rubber compounds and salt grain‐sized, respectively) on tribology performances are also evaluated. In a ring‐on‐block test, the optimal parameters of modified rubber achieved a low friction coefficient of 0.008, which reduced by 42% compared with untreated one (0.019) under the same operating condition. It can be expected that the developed method is beneficial to reduce the friction coefficient of rubber‐steel friction pair under water lubricated condition. Abstract : This study proposed a method to fabricate porous surface of nitrile butadiene rubber (NBR) by porous leaching use salt as micro‐holes forming. The porous surface can act as lubricant reservoirs and the sink for capturing wear debris, which provide secondary lubrication for the sliding interface especially under mixed lubrication condition. The ring on block tribology test showed that, the treated rubber obtained a lower friction coefficient and wear rate compared to the untreated samples.