Abstract Since anti-aging agents are widely used to improve the heat resistance of magnetic composites, the exploration to the effect of anti-aging agents on the magnetic composites is of great significance to the practical application. In this work, nitrile rubber/iron oxide/zinc dimethacrylate composites were prepared by incorporating various commercial anti-aging agents which are commonly used. It is found that the cross-linking density of the composites was obviously reduced after adding the anti-aging agents, which had a great influence on the mechanical properties. For example, compared with the composite without antioxidants, after adding the anti-aging agent DAPD, the elongation at break of the composite increased by ~ 4-fold, the hardness of shore A decreased by ~23°, and stress at 100% elongation decreased by ~4.5 MPa. Furthermore, the addition of the anti-aging agents was beneficial to promote the relative slip between rubber molecular chains and internal lubrication of the rubber compounds, thus improving the processing performance of the composites. Finally, the thermo-oxidative aging of composites with different anti-aging agents at different time and temperatures was evaluated. This paper provides constructive suggestions to further modify and select the antioxidants for the magnetic composites.

中文翻译：

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抗氧化对填充丁腈橡胶硫化/加工及热氧化老化的影​​响

摘要 由于抗老化剂被广泛用于提高磁性复合材料的耐热性，探索抗老化剂对磁性复合材料的影响对实际应用具有重要意义。在这项工作中，丁腈橡胶/氧化铁/二甲基丙烯酸锌复合材料通过加入各种常用的商业抗老化剂制备。发现加入抗老化剂后复合材料的交联密度明显降低，对力学性能影响较大。例如，与不含抗氧化剂的复合材料相比，加入抗老化剂DAPD后，复合材料的断裂伸长率提高了~4倍，肖氏A硬度降低了~23°，100%伸长率时的应力降低了~4.5 MPa。此外，抗老化剂的加入有利于促进橡胶分子链之间的相对滑动和胶料的内部润滑，从而提高复合材料的加工性能。最后，评估了不同抗老化剂在不同时间和温度下的复合材料的热氧化老化。本文为进一步改进和选择磁性复合材料的抗氧化剂提供了建设性的建议。