炭黑/白炭黑复合填料网络在天然橡胶屈挠疲劳过程中的作用分析

Analysis on effect of carbon black/silica composite filler network during NR flexion fatigue

通过改变填料体系中炭黑/白炭黑的用量比,制备出具有不同填料网络结构的硫化胶,通过胶料的硫化特性、交联密度、结合胶含量、Payne效应、损耗特性对填料网络结构进行表征并建立填料网络结构模型,最后通过各种性能测试考察了填料网络对橡胶动静态力学性能和屈挠疲劳性能的影响,建立了复合填料网络结构和屈挠疲劳性能的相关性。结果表明,白炭黑-白炭黑相互作用强于炭黑-炭黑相互作用,但白炭黑与橡胶基体的结合作用差;复合填料网络在屈挠疲劳过程中产生的内耗小,白炭黑/炭黑质量比为20/20时,硫化胶的疲劳性能最好。

The vulcanizates with different filler network structures were designed and prepared by varying the amount of carbon black/silica.The vulcanizates with different filler network structures were then characterized by vulcanization properties,cross-linking density,binder content,Payne effect,and loss characteristics of the compounds and the filler network structure model was established.Finally,through a variety of performance tests,the impact of the filler network on the dynamic and static mechanical properties and flexural fatigue performance of the rubber was examined.The correlation between the composite filler network structure and the flexion fatigue performance was established.The results showed that the silica-silica interaction is stronger than the carbon black-carbon black interaction,but the silica-rubber interaction is weak.The internal friction of the composite filler network during the flexion fatigue process is small.When the amount of silica/carbon black is 20/20,the vulcanizate has the best fatigue performance.