丁腈橡胶5171密封件热氧老化研究

开展了腈橡胶5171热氧老化试验,结合老化前后宏观、微观性能的变化,对其热氧老化行为及规律进行了研究。结果表明,老化前期,丁腈橡胶5171的物理力学性能出现了较大幅度下降,表面氧元素相对含量及分子链交联密度明显增大,说明橡胶发生了以交联反应为主的吸氧老化;随着老化时间的延长,表面碳元素相对含量上升,氧、氮元素相对含量下降,说明防老剂D和增塑剂癸二酸二丁酯发生了向表面的扩散和迁移,进一步劣化了橡胶的性能。

Thermal-oxidative Aging of Nitrile Rubber5171Sealing Element

Thermal oxidative aging test of nitrile rubber 5171 was carried out.The thermal oxidative aging behaviors were studied combining with macro and micro performance analysis before and after aging.The results showed that the physical and mechanical properties of nitrile rubber 5171 declined greatly during earlier stage;relative content of oxygen at surface and the crosslink density increases apparently,indicating that the crosslink reaction is the main reactions of nitrile rubber 5171 during aging;relative content of carbon at surface increases with the extension of aging time,while oxygen and nitrogen decreasing,indicating that the antioxidant D and dibutyl sebacate diffuses and migrates from inside to the outside of nitrile rubber 5171.