| Effect of Graphite Purification on Properties of Cryptocrystalline Graphite/Carbon Black/XNBR Composites |
| Received:May 12, 2021 Revised:May 12, 2021 |
| DOI：10.12136/j.issn.1000-890X.2021.09.0650 |
| Key Words: cryptocrystalline graphite；purification；XNBR；carbon black；composite；dispersion；friction and wear property |
| Author Name | Affiliation | E-mail | | TONG Xi* | Beijing Research and Design Institute of Rubber Industry Co.，Ltd | 330972596@qq.com | | WAN Dachun | New Image Strategy & Consulting Co.，Ltd | | | GAO Jiahua | Beijing Research and Design Institute of Rubber Industry Co.，Ltd | | | WU Jiangtao | Beijing Research and Design Institute of Rubber Industry Co.，Ltd | |
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| Abstract: |
| The fixed carbon mass fraction of cryptocrystalline graphite（CG） could be increased to 0. 94 by purification with acid treatment，but a small amount of quartz also remained. The effect of CG purification on the properties of CG/carbon black/carboxylated nitrile rubber（XNBR） composites which were prepared by using the emulsion blending method was studied. The results showed that the dispersions of unpurified CG and purified CG in the rubber matrix were relatively uniform，but the purified CG had higher reinforcement efficiency and better lubricity. The friction coefficient and specific wear rate of the composites with purified CG were lower than those of the composites with unpurified CG，which might be due to the reduced content of hard large particle impurities（such as crystalline quartz） in the purified CG，which made it easier to form
a continuous lubrication film and a transfer film in the friction process. |
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