An outstanding interest on elimination of nitrosamine generation in traditional sulfur vulcanization systems has led to introduce nitrosamine safe accelerator/s to produce safe natural rubber (NR) vulcanizates. It is an effective way to prevent formation of carcinogenic N-nitroso compounds during manufacture of rubber products. In the present study, behavior of nitrosamine safe binary accelerator system consisting of diisopropyl xanthogen polysulfide (DIXP) with commonly used non-regulated accelerator N-tert-butyl-2-benzothiazole sulfenamide (TBBS) was investigated in efficient sulfur vulcanization of NR. Cure characteristics, physico-mechanical properties and crosslink density of vulcanizates prepared with different combinations of the accelerator system were evaluated and compared with those of individual accelerators. The study reveals that moduli and strength properties of the vulcanizate prepared with DIXP accelerator are inferior to those of the vulcanizate prepared with TBBS accelerator. Nevertheless, optimum cure time of the DIXP compounds is lower in comparison to TBBS compounds. Moreover, progressive replacement of DIXP with TBBS in the accelerator system showed a synergistic effect in regard to cure characteristics and physico-mechanical properties.

对于消除传统硫磺硫化系统中亚硝胺的产生，人们产生了浓厚的兴趣，因此引入了亚硝胺安全型促进剂来生产安全的天然橡胶（NR）硫化胶。这是防止在橡胶产品生产过程中形成致癌性N-亚硝基化合物的有效方法。在本研究中，由二异丙基黄原多硫化物（研究了使用常用的非调节促进剂N-叔丁基-2-苯并噻唑亚磺酰胺（TBBS）的DIXP技术对NR进行有效的硫磺硫化。评价了使用不同促进剂体系组合制备的硫化胶的固化特性，物理力学性能和交联密度，并将其与单独的促进剂进行了比较。研究表明，用DIXP促进剂制备的硫化橡胶的模量和强度性能不如用TBBS促进剂制备的硫化橡胶。但是，与TBBS化合物相比，DIXP化合物的最佳固化时间要短。此外，在促进剂系统中用TBBS逐步取代DIXP表现出了固化特性和物理机械性能的协同效应。