Abstract

To solve the key problem of accelerated aging for packer rubber cylinder under high temperature. The hydrogenated nitrile rubber (HNBR) composites reinforced by multi-walled carbon nanotubes (MWCNTs) were prepared. Effect of MWCNTs on the aging performance of HNBR/MWCNTs composites was studied with dilute oxygen as a medium at 180 °C. Fourier-infrared spectroscopy, differential scanning calorimetry, dynamic thermomechanical analysis and transmission electron microscope were used to investigate the aging behavior of HNBR/MWCNTs composites. The tensile strength of HNBR composites with 3, 6, and 9 phr MWCNTs loading increased by 35%, 37%, and 39% respectively. After 15 days at 180 °C, HNBR composites with 3 phr of MWCNTs had a tensile strength retention rate of 91% and an elongation retention rate of 57%, while the blank HNBR composites had a tensile strength retention ratio of 72% and elongation retention ratio of 52%. The result of DSC shows that the presence of MWCNTs can enhance T_g of HNBR composite, the T_g increase rate (2 °C) for HNBR/MWCNTs composites was lower than that (3.2 °C) for the blank in 15 days at 180 °C. MWCNTs exhibited better reinforcement and excellent anti-aging performance. The possible anti-aging mechanism has been proposed.

摘要

解决封隔器胶缸高温加速老化的关键问题。制备了多壁碳纳米管（MWCNTs）增强的氢化丁腈橡胶（HNBR）复合材料。以稀氧为介质，在 180 °C 下研究了 MWCNTs 对 HNBR/MWCNTs 复合材料老化性能的影响。采用傅里叶红外光谱、差示扫描量热法、动态热机械分析和透射电子显微镜研究了HNBR/MWCNTs复合材料的老化行为。加载 3、6 和 9 phr MWCNTs 的 HNBR 复合材料的拉伸强度分别提高了 35%、37% 和 39%。在 180 °C 下 15 天后，含有 3 phr MWCNTs 的 HNBR 复合材料的拉伸强度保持率为 91%，伸长率保持率为 57%，而空白 HNBR 复合材料的拉伸强度保持率为 72%，伸长率保持率为 52%。DSC 的结果表明，MWCNTs 的存在可以增强HNBR复合材料的T _g ，HNBR / MWCNTs复合材料的T _g增加率（2°C）低于180°C下15天的空白（3.2°C）。MWCNTs表现出更好的增强和优异的抗老化性能。已经提出了可能的抗衰老机制。