导电炭黑在NBR中的应用研究

Application of Conductive Carbon Black to NBR Compound

对导电炭黑（ＣＳＦ）作为ＮＢＲ的填料时，其填充量、硫化时间和增塑剂用量等因素对ＮＢＲ／ＣＳＦ混炼胶加工性能和硫化特性及硫化胶物理性能和电性能的影响进行了研究，并与乙炔炭黑（ＡＣＥＴ）进行了对比。结果表明，随着ＣＳＦ用量的增大，混炼胶的炭黑结合ＮＢＲ量、门尼粘度［ＭＬ（１＋４）１００℃］、屈服强度和拉伸强度均增大，扯断伸长率和挤出膨胀率降低，挤出物外观变优，焦烧时间和正硫化时间延长，硫化速度放慢，硫化胶的物理性能有所降低，导电性能提高；硫化胶体积电阻率随硫化时间延长和施加负荷的增大而降低，随温度升高和增塑剂ＤＯＰ用量增大而升高。ＮＢＲ／ＣＳＦ混炼胶的结合橡胶量、门尼粘度和混炼胶应力应变性能及硫化胶导电性能等均高于ＮＢＲ／ＡＣＥＴ混炼胶。

The effect of loading level,cure time and plasticizer level on the processibility and cure characteristics of NBR compound filled with a new type of conductive carbon black CSF and its vulcanizate physical properties and electric property was studied and compared with that of acetylene black(ACET) compound and vulcanizate.The results showed that the black bound rubber contents,Mooney viscosity[ML(1+4)100 ℃],yield strength and tensile strength increased,the elongation at break and extrusion die swelling decreased,the extrudate appearance improved,the scorch time and optimum cure time were longer,the cure rate slowed down,the physical properties of the vulcanizate decreased and the electrical property improved as the CSF loading level increased;the electric volume resistivity of vulcanizate decreased as the cure time and the applied load increased,and increased as the temperature and the level of plasticizer DOP increased.The black bound rubber,Mooney viscosity and stress strain properties of the CSF compound and its vulcanizate conductivity improved when compared with those of ACET compound and vulcanizate.