Cure System and Carbon Black Effects on NR Compound Performance in Truck Tire Applications

摘要

It is well known that the ratio of sulfur to accelerator in sulfur vulcanization system has the significant influence on NR network structure. Depending on the ratio, the sulfur vulcanization can be classified into three types: Conventional, Semi-efficient, and Efficient systems. Each system can result in NR network structure with different combinations of poly-sulfidic, di-sulfidic, and mono-sulfidic bonds, which have significant effect on typical compound properties such as tensile, fatigue, reversion, and aging. ...etc. This study is to understand the impact of the combination of the cure system and carbon black morphology on NR compound properties, particularly on abrasion wear resistance, cut-and-chip, and heat-built-up, which are the important performance requirements in truck tire applications. Three cure systems (Conventional, Semi-efficient, Efficient) were selected based on the ratio of sulfur to accelerator: 5, 1, and 0.1. The network structure (types and amount of mono-sulfidic, di-sulfidic, and poly-sulfidic bonds) has been characterized and correlated to compound performances. Carbon blacks with different morphology (N234, N220, and N231) and loading were also included in this study.