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Synergistic activities of binary accelerators in presence of magnesium oxide as a cure activator in the vulcanization of natural rubber
Journal of Elastomers & Plastics ( IF 1.7 ) Pub Date : 2021-06-10 , DOI: 10.1177/00952443211020794
Md Najib Alam 1 , Vineet Kumar 1 , Pranut Potiyaraj 2 , Dong-Joo Lee 1 , Jungwook Choi 1
Affiliation  

We describe the synergistic activities of binary vulcanizing accelerators in presence of magnesium oxide as cure activator in the vulcanization of natural rubber. Thiuram type tetramethyl thiuram disulfide (TMTD) and thiocarbamate type zinc dimethyl dithiocarbamate (ZDMC) accelerators in combination with dibenzothiazyl disulfide (MBTS) were investigated for the vulcanization of rubber. The cure, mechanical, and thermal properties of rubber vulcanizates were studied with magnesium oxide-based cure activator. Notable synergism in the delta torque, cross-link density, and mechanical properties was found when using binary accelerators with magnesium oxide. The zinc-containing thiocarbamate accelerator, ZDMC, showed better synergistic activity in presence of magnesium oxide than the non-zinc-based thiuram accelerator, TMTD. To find out the possibility of making a zinc-oxide-free natural rubber compound, a control compound was prepared with 5 phr of zinc oxide as a cure activator with the best evaluated binary accelerators system with magnesium oxide (3:6 millimolar ratio of ZDMC to MBTS). We also compared the curing and mechanical properties of carbon black-reinforced rubber with zinc oxide and magnesium oxide separately with this binary accelerators system. The results indicated that a completely zinc-oxide-free natural rubber compound was possible with comparable values in the mechanical properties, thermal properties and a higher rate of vulcanization.



中文翻译:

天然橡胶硫化中二元促进剂在氧化镁作为硫化活化剂存在下的协同活性

我们描述了二元硫化促进剂在天然橡胶硫化中作为硫化活化剂存在的氧化镁的协同活性。研究了秋兰姆型四甲基秋兰姆二硫化物 (TMTD) 和硫代氨基甲酸酯型二甲基二硫代氨基甲酸锌 (ZDMC) 促进剂与二苯并噻唑二硫化物 (MBTS) 的组合用于橡胶硫化。用氧化镁基硫化活化剂研究了硫化橡胶的硫化、机械和热性能。当使用二元加速剂和氧化镁时,发现了增量扭矩、交联密度和机械性能的显着协同作用。含锌硫代氨基甲酸酯促进剂 ZDMC 在氧化镁存在下表现出比非锌基秋兰姆促进剂 TMTD 更好的协同活性。为了找出制造不含氧化锌的天然橡胶胶料的可能性,使用 5 份氧化锌作为硫化活化剂,使用评价最好的二元促进剂体系与氧化镁(ZDMC 的 3:6 毫摩尔比)制备对照胶料到 MBTS)。我们还分别用这种二元促进剂系统比较了炭黑增强橡胶与氧化锌和氧化镁的硫化和机械性能。结果表明,完全不含氧化锌的天然橡胶化合物在机械性能、热性能和更高的硫化速率方面具有可比的值是可能的。ZDMC 与 MBTS 的 6 毫摩尔比)。我们还分别用这种二元促进剂系统比较了炭黑增强橡胶与氧化锌和氧化镁的硫化和机械性能。结果表明,完全不含氧化锌的天然橡胶化合物在机械性能、热性能和更高的硫化速率方面具有可比的值。ZDMC 与 MBTS 的 6 毫摩尔比)。我们还分别用这种二元促进剂系统比较了炭黑增强橡胶与氧化锌和氧化镁的硫化和机械性能。结果表明,完全不含氧化锌的天然橡胶化合物在机械性能、热性能和更高的硫化速率方面具有可比的值是可能的。

更新日期:2021-06-10
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