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Synthesis of novel macromolecular coupling agent and its application in nano-copper lubricating oil

Author(s):

Juhua Luo*, Ning Yu, Mingliang Cheng, Wei Yao and Jianguang Xu  

Abstract:


BACKGROUND: Due to temperature-insensitive and limited tribochemical reaction, the nanolubricant has caused tremendous focus over the past few years. The addition of nanoparticles in lubricant has been demonstrated to reduce the coefficient of friction and to increase the load-carrying capability of lubricant in coupled surfaces. Much attention has been paid to copper nanoparticles for their perfect friction reduction and wear resistance performances. However, it is difficult to maintain stable dispersion in lubricant oil for the aggregation of copper nanoparticles.

METHODS: A novel macromolecular coupling agent copolymers, styrene-butyl methacrylate-3-methoxyacryloyl-propyltrimethoxyl silicon, was successfully prepared by free radical polymerization. The structure and composition of copolymer were characterized through X-ray diffractometer, Fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer. The load-carrying capacities and anti-wear properties of the base oil were evaluated on four-ball tester.

RESULTS: The average size of the nano-Cu particle was around 40 nm. The modifier, St-MMA-(KH-570) macromolecular copolymer, could improve the dispersibility of nano-Cu particles. The introduction of the nano-Cu particles helped to improve the tribological properties of base oil.

CONCLUSION: The macromolecular coupling agent was synthesized by free radical solution polymerization method. The modifier was able to bond to the nano-Cu via chemical interaction. The modified Cu nanoparticles as the additive were able to greatly improve the anti-wear and extreme pressure properties of base oil. The optimum concentration of modified Cu nanoparticles in base oil was 0.25 wt.%.

Keywords:

Functionalization of polymers, synthesis, separation techniques, nanolubricant, macromolecular coupling agent, copper nanoparticles

Affiliation:

School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R., School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R., School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R., School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R., School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R.



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