Structure and Properties of Carbon Black Filled Powdered NR Used as Tread Compound of Truck Radial Tire

Using natural rubber latex and carbon black N234 as raw materials,the carbon black filled powdered natural rubber[P(NR/CB)] was prepared by latex/carbon black coagulation method.The influence of addition level of carbon black and different recipes on the curing characteristics,physical properties,crosslink density,microstructure,Payne effect and dynamic mechanical properties of P(NR/CB) was investigated,and compared with conventional carbon black filled NR(CB/NR) by mechanical mixing.The results showed that,compared with CB/NR vulcanizates,the tensile strength,tear strength,resilience and wet skid resistance of P(NR/CB) vulcanizates were higher,the rolling resistance was lower,flexing resistance and wear resistance were similar,while the dynamic compression heat build-up and compression set were reduced by approximately 50%.