硫化返原是指天然橡胶经过长时间硫化后硫化胶变软、强度降低的现象。在有些文献中还把硫化胶高温老化后物理性能降低的现象也包括到硫化返原之中。人们常常根据经验把这种现象同NR联系在一起,但所有的二烯橡胶以及NR与其他二烯橡胶的共混胶也会发生硫化返原。硫化返原现象缩小了硫化工艺的变动空间,增加了硫化胶不合格的机会,并严重限制了厚制品的硫化 Vulcanization refers to the natural rubber vulcanized rubber after a long period of softening, the intensity of the phenomenon of reduction. In some literatures, the phenomenon that the physical properties of the vulcanizates deteriorate after aging at high temperature is also included in the reversion of the vulcanizates. This phenomenon is often associated with NR based on experience, but all diene rubbers and NR blends with other diene rubbers also undergo sulfidation. Vulcanization reduces the variability of the cure process, increases the chance of unqualified vulcanizates and severely limits the cure of thick products