diolefin

Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.

三元乙丙（EPDM）乙烯、丙烯和少量非共轭二烯烃共聚物。

The diolefins and alkenyl aromatics are very unstable components which can give gums by polymerization.In giving olefins and alky aromatics the hydrogenation improves the product quality.

二烯烃和烯基芳烃非常不稳定组分，可聚合产生凝。对于给定烯烃和烷基芳烃，氢化可改善产品质量。