新型防老剂Naugard 445用量对三元乙丙橡胶共混胶性能的影响

Effect of the dosage of new antioxidant Naugard 445 on the properties of EPDM rubber blends

为进一步提高新能源汽车发动机密封圈的使用性能,以4,4-二(苯基异丙基)二苯胺(Naugard 445)和2-硫醇基甲基苯并咪唑锌盐(Vulkanox ZMB2)并用作为防老剂,系统研究了防老剂Naugard 445用量对三元乙丙橡胶共混胶物理机械性能、热氧老化性能、动态力学性能和热稳定性的影响。结果表明:与空白胶相比,Naugard 445和Vulkanox ZMB2并用能大大提高三元乙丙橡胶硫化胶的耐老化性能,随着防老剂Naugard 445用量的增加,压缩永久变形增大。当防老剂Naugard 445用量为0.2份时,三元乙丙橡胶共混硫化胶的物理机械性能、耐高温老化性能和压缩永久变形性能最优,达到新能源汽车密封圈性能的要求。

In order to further improve the performance of engine seals for new energy vehicles,this paper systematically investigated the effect of the dosage of antioxidant Naugard 445 on the physical and mechanical properties of EPDM rubber blends by using 4,4-bis(phenylisopropyl)diphenylamine(Naugard 445)and zinc salt of 2-thioxomethylmethylbenzimidazole(Vulkanox ZMB2)as antioxidants.The effects of the amount of Naugard 445 on the physical and mechanical properties of EPDM rubber blends,thermo-oxidative aging properties,dynamic mechanical properties and thermal stability were systematically investigated.The results show that compared with the blank rubber,the combination of Naugard 445 and Vulkanox ZMB2 can greatly improve the aging resistance of EPDM vulcanized rubber,and the compression permanent deformation increases with the increase of the dosage of antioxidant Naugard 445.When the dosage of antioxidant Naugard 445 is 0.2,the physical and mechanical properties,high temperature aging resistance and compression permanent deformation of EPDM rubber vulcanized rubber are optimal,which meets the requirements of the new energy automobile sealing ring performance.