Pan Yiren, Pan Yi, Wang Zhilin, Han Shuang, Han Wenwen, Bian Huiguang
College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China.
Polymers (Basel). 2022 Mar 24;14(7):1319. doi: 10.3390/polym14071319.
In the cracking process of waste tires, pyrolysis carbon black (CBp), as a solid product, accounts for about 35% of the total tire rubber content. Here, the treated CBp has been gradually applied to the tire formula to improve the recycling efficiency of waste tires. This study elucidated the influence of adding CBp during the tire mixing process on soft friction and metal wear. Compared with industrial carbon black (I-CB), the friction coefficient of CBp was smaller at different mixing stages, and the ripple caused by adhesion friction was not evident. After the modified CBp (M-CBp) was obtained by implementing the surface activation of common CBp (C-CBp), the friction coefficient between M-CBp and metal increased by 10%, while the filler dispersion and comprehensive mechanical properties showed an upward trend. The wear rate of metal was higher than that observed after adding I-CB during the same mixing mode; thus, it was necessary to strengthen the wear resistance of the inner-wall surface of the mixing chamber. The -OH group on the M-CBp surface can also participate in the silane coupling reaction and aggravate the metal wear of the mixer chamber wall. Through a comparison of results, the mixing friction coefficient can reflect the strength of filler-rubber interaction, which in turn can preliminarily represent the dispersion effect and comprehensive properties, reveal the reason behind the poor performance of CBp, and highlight the need for modification from the perspective of tribology.
在废旧轮胎的裂解过程中，热解炭黑（CBp）作为一种固体产物，约占轮胎橡胶总含量的35%。在此，经过处理的CBp已逐渐应用于轮胎配方中，以提高废旧轮胎的回收效率。本研究阐明了在轮胎混炼过程中添加CBp对软摩擦和金属磨损的影响。与工业炭黑（I-CB）相比，CBp在不同混炼阶段的摩擦系数较小，且粘着摩擦引起的波纹不明显。通过对普通CBp（C-CBp）进行表面活化得到改性CBp（M-CBp）后，M-CBp与金属之间的摩擦系数提高了10%，同时填料分散性和综合力学性能呈上升趋势。在相同混炼方式下，金属的磨损率高于添加I-CB后的磨损率；因此，有必要增强混炼腔内表面的耐磨性。M-CBp表面的-OH基团也会参与硅烷偶联反应，加剧混炼腔壁的金属磨损。通过结果比较可知，混炼摩擦系数能够反映填料与橡胶之间相互作用的强度，进而可以初步表征分散效果和综合性能，揭示CBp性能不佳的原因，并从摩擦学角度突出改性的必要性。
