With the emerging concerns on the use of nitrosamine evolving accelerators, safer alternatives are desirable for the rubber industry. In the present study, cure characteristics, physicomechanical properties, crosslink density, aging, dynamic mechanical, and thermal properties of vulcanizates prepared with two nitrosamine safe binary accelerator systems containing diisopropyl xanthogen polysulfide (DIXP) and tetrabenzyl thiuram disulfide (TBzTD), and DIXP and dibenzyl dithiocarbamate (ZBeC) were investigated for efficient sulfur vulcanization of natural rubber (NR) compounds. Synergistic effect in both cure and physicomechanical properties was observed for all the combinations of the two accelerator systems. The composition containing DIXP with a lower loading (0.6 phr) of TBzTD, and ZBeC, demonstrated the highest technological performance. Retention of tensile properties on oxidative aging was highest for the vulcanizate prepared with DIXP/TBzTD (1.4/0.6). Dynamic mechanical and thermogravimetric analysis further confirmed the crosslink density and thermal stability of the network structure of the binary systems. In overall, DIXP shows the potential to be used as a safer accelerator in the manufacture of appropriate dry NR-based rubber products.

中文翻译：

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二异丙基黄原多硫化物作为潜在促进剂在天然橡胶化合物高效硫磺硫化中的应用

随着对使用亚硝胺演变促进剂的关注日益增加，橡胶工业需要更安全的替代品。在本研究中，硫化胶的硫化特性、物理机械性能、交联密度、老化、动态力学和热性能由两种含有二异丙基黄原多硫化物 (DIXP) 和四苄基秋兰姆二硫化物 (TBzTD) 的亚硝胺安全二元促进剂体系以及 DIXP 和研究了二苄基二硫代氨基甲酸酯 (ZBeC) 对天然橡胶 (NR) 化合物的高效硫磺硫化。对于两种促进剂系统的所有组合，观察到固化和物理机械性能的协同效应。含有 DIXP、TBzTD 和 ZBeC 负载量较低 (0.6 phr) 的组合物表现出最高的技术性能。用 DIXP/TBzTD (1.4/0.6) 制备的硫化胶在氧化老化时的拉伸性能保持率最高。动态力学和热重分析进一步证实了二元体系网络结构的交联密度和热稳定性。总体而言，DIXP 显示出在制造合适的干 NR 基橡胶产品时用作更安全促进剂的潜力。