三元乙丙橡胶（EPDM）因其优异性能，被广泛用作直流输电工程阀冷系统密封材料，但受温度、水分、氧气等因素影响，仍不免发生性能劣化现象。文章研究不同硫化体系对EPDM橡胶硫化特性、力学性能和湿热老化性能的影响。结果显示：采用普通硫黄硫化（CV）、有效硫化（EV）和半有效硫化（SEV）体系的硫化效率较高；混合硫化（MV）体系具有综合最优的力学性能；湿热老化后，CV和过氧化物硫化（DV）体系的EPDM橡胶拉伸强度和断裂伸长率下降幅度较大，硬度则有所升高，EV和SEV体系由于交联结构较稳定，力学性能变化不大，MV体系的力学性能变化规律与CV体系相似，但变化幅度较小。

Ethylene propylene diene monomer (EPDM) rubber is widely used as sealing material for valve cooling system of converter station in DC transmission engineering due to its excellent properties. However, various factors, including temperature, humidity and oxygen, would lead to performance degradation. In this paper, the effects of vulcanization systems on the vulcanization characteristics, mechanical properties and damp-heat aging properties of EPDM rubber were studied. The results showed that the conventional sulfur vulcanization (CV), effective vulcanization (EV), and semi-effective vulcanization (SEV) systems exhibited relatively high vulcanization efficiency. The mixed vulcanization (MV) system had comprehensive optimal mechanical properties. After damp heat aging, the tensile strength and elongation at break of EPDM rubber in CV and peroxide vulcanization (DV) systems decreased but their hardness increased to some extent. Owing to the stable cross-linked structure of EV and SEV systems, their mechanical properties only slightly changed. The change of the mechanical properties of MV system was similar to that of CV system, but the change range was small.