Packer rubber cylinders in oil drilling operations must withstand high pressure, high temperature, and destruction of mediums. To ensure the long-term service time of the hydrogenated nitrile rubber (HNBR) packer rubber cylinders, it is essential to understand the aging mechanism of HNBR in different aging environments. Four HNBR with various acrylonitrile contents (ACN 17%, 21%, 34%, and 43%) were prepared in this work, and effect of CN content on the mechanical properties, aging resistance, and dynamic mechanical properties of HNBR were investigated respectively. It was observed that the higher the CN content, the stronger the mechanical properties of the HNBR, and the mechanical properties of HNBR with high CN content decayed rapidly at high temperatures. According to the thermo-oxidative aging data, the cross-linking reactions were investigated during the thermo-oxidative aging of HNBR, leading to a decrease in the properties of HNBR. In a high temperature (180°C) aqueous medium, the chemical structure of HNBR underwent dramatic changes. The CN group is converted to CONH₂ and COO⁻ group, and the resulting COO⁻ reacted further with CONH₂ in deionized water and with metal ions (Ca²⁺ or Mg²⁺) in mineralized and oily water to form cross-linking network, and the possible aging mechanisms of HNBR in different mediums were given.

中文翻译：

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硫化氢化丁腈橡胶在不同介质中的性能及老化机理研究

石油钻井作业中的封隔器胶筒必须承受高压、高温和介质的破坏。为保证氢化丁腈橡胶（HNBR）封隔器胶筒的长期使用时间，了解氢化丁腈橡胶在不同老化环境下的老化机理至关重要。本工作制备了四种不同丙烯腈含量(ACN 17%、21%、34%和43%)的HNBR，分别考察了CN含量对HNBR力学性能、耐老化性能和动态力学性能的影响。 . 观察到CN含量越高， HNBR的力学性能越强，高的HNBR的力学性能CN 含量在高温下迅速衰减。根据热氧化老化数据，研究了HNBR在热氧化老化过程中发生的交联反应，导致HNBR性能下降。在高温（180°C）水介质中，氢化丁腈橡胶的化学结构发生了剧烈变化。 CN基团转化为 CONH ₂和 COO ⁻基团，生成的 COO ⁻在去离子水中与 CONH _{2和金属离子（Ca} ²⁺或Mg ²⁺)在矿化水和含油水中形成交联网络，给出了HNBR在不同介质中可能的老化机制。