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Tribological Behaviors of Polyurethane Composite Coatings Filled with Ionic Liquid Core/Silica Gel Shell Microcapsules

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Abstract

Silica gel shell microcapsules containing ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) have been successfully synthesized through an interfacial self-assembly process and solgel reaction. They are further developed as filler to improve the tribological property of polyurethane composite coatings. The tribological behaviors of the polyurethane composite coatings filled with microcapsules have been systematically investigated using ball-on-disk tribological test. The results showed that the polyurethane composite coating filled with microcapsules displayed much lower friction coefficient and wear, compared with that of unfilled one. It is demonstrated that the ionic liquid released from the broken microcapsules during the friction process lubricates the rubbing surfaces and prevents a direct contact between steel ball and coating, leading to a lower friction coefficient and a lower wear width and depth.

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Acknowledgments

The authors acknowledge the financial support by the National Science Foundation of China (Grant Nos. 51375472 and 51305429).

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Road 18th, Lanzhou, 730000, People’s Republic of China

    Mingming Yang, Xiaotao Zhu, Guina Ren, Xuehu Men, Fang Guo, Peilong Li & Zhaozhu Zhang

  2. University of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China

    Mingming Yang & Guina Ren

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  1. Mingming Yang
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  2. Xiaotao Zhu
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  3. Guina Ren
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  4. Xuehu Men
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  5. Fang Guo
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  6. Peilong Li
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  7. Zhaozhu Zhang
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Correspondence to Xuehu Men or Zhaozhu Zhang.

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Yang, M., Zhu, X., Ren, G. et al. Tribological Behaviors of Polyurethane Composite Coatings Filled with Ionic Liquid Core/Silica Gel Shell Microcapsules. Tribol Lett 58, 9 (2015). https://doi.org/10.1007/s11249-015-0492-7

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