硅土/炭黑复合填料对天然橡胶性能的影响

摘要

对硅土进行活化和改性处理，通过测定吸油值、吸碘值进行表征。将经改性处理的硅土与炭黑复合用于填充天然橡胶，进行物理机械性能测试。结果表明：硅土与炭黑并用，与单独填充炭黑相比，对橡胶的加工性能影响不明显。拉伸性能测试结果表明，复合填料与单独填充炭黑相比，能提高NR硫化胶拉伸强度，扯断伸长率提高。当硅土与炭黑质量比为2∶5时，NR硫化胶的拉伸强度达到最大。硅土和炭黑并用能增强天然橡胶的综合性能，降低成本。%Siliceous earth from Fujian was selected as raw material. The composition and structure were analyzed. Siliceous earth was modified by KH570 and characterized by iodine absorption number and DBP. The modiifed siliceous earth was blended with silica to ifll natural rubber (NR). Curing characteristics, mechanical properties of NR composites were analyzed. The results show that when carbon black and siliceous earth work together, the inlfuence on the processing performance of NR isn’t obvious. Tensile test results show that the hybrid ifller compared with carbon black used alone, can improve the tensile strength of NR composites, and signiifcantly increase the rubber elasticity. When the mass ratio of siliceous earth to carbon black is2∶5, the tensile strenth of NR composites is the best. Siliceous earth and carbon black using together can inhance the comprehensive properties of NR and reduce the cost.