The hybrid fillers were reported to exhibit remarkable reinforcement in the mechanical properties of rubber composites. Herein, the pyrolytic rice husk (PRH) containing biochar and silica content was used as a natural hybrid filler, and exploited as a sustainable substitute for carbon black and commercial silica. The biochar and silica of PRH were cross-linked via Si-O-C bond and developed synergistic effect in rubber matrix, leading to the better reinforcement than the single component filler. Moreover, the influence of ball milling parameters on the physiochemical characteristics of PRH and the filler reinforcement of natural rubber vulcanizates were investigated. The results revealed that the changes of PRH in particle size, pore structure and surface chemistry affected its reinforcing performance. The optimal ball milled sample EM-400 showed 44%, 18%, 9% improved reinforcement in tensile strength, 300% modulus and tear strength of vulcanizates compared with the unmilled PRH. This work provides a facile approach to produce high-performance bio-fillers for rubber industry.

据报道，杂化填料在橡胶复合材料的机械性能方面表现出显着的增强。本文中，含有生物炭和二氧化硅含量的热解稻壳（PRH）被用作天然杂化填料，并被用作炭黑和商业二氧化硅的可持续替代品。PRH的生物炭和二氧化硅通过Si-OC键交联，并在橡胶基体中发挥了协同作用，从而使补强性优于单组分填料。此外，还研究了球磨参数对天然橡胶硫化物PRH的理化特性和填料增强的影响。结果表明，PRH的粒径，孔结构和表面化学性质的变化会影响其补强性能。与未研磨的PRH相比，最佳的球磨样品EM-400显示硫化橡胶的拉伸强度，300％模量和撕裂强度的增强分别提高了44％，18％，9％。这项工作为生产用于橡胶工业的高性能生物填料提供了一种简便的方法。