导电炭黑/杜仲橡胶复合材料导电性能和电磁屏蔽性能的研究

Conductivity and Electromagnetic Shielding Property of Conductive Carbon Black/Eucommia Ulmoides Gum Composite

采用机械共混法制备导电炭黑EC-600JD(简称导电炭黑)/杜仲橡胶复合材料,研究导电炭黑用量对复合材料导电性能和电磁屏蔽性能的影响。结果表明:随着导电炭黑用量的增大,复合材料的硬度、定伸应力、拉伸强度和撕裂强度提高,Payne效应增强,电导率和电磁屏蔽效能增大,导电炭黑粒子在橡胶基体中形成导电通路直至形成三维导电网络;当导电炭黑用量为20份时,复合材料的最大电磁屏蔽效能达到33.2 dB,可满足一般工业或者商业用电子设备要求;当导电炭黑用量为25份时,复合材料的电导率达到330 S·m^(-1)。

Conductive carbon black EC-600JD（CCB）/eucommia ulmoides gum composites were prepared by mechanical blending. The effects of CCB amount on the conductivity and electromagnetic shielding property of the composites were investigated. The results showed that,when the amount of CCB increased,the hardness,modulus,tensile strength and tear strength of the composite increased,the Payne effect was strengthened,the conductivity and electromagnetic shielding effectiveness increased,and eventually three-dimensional conductive network was formed by conductive carbon black in rubber matrix. When the CCB amount was 20 phr,the electromagnetic shielding effectiveness of the composite reached 33.2 dB which could met the requirements of electronic equipment for common industrial applications. When the CCB amount was 25 phr,the conductivity of the composite reached 330 S·m-1.