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为获得一种低压缩、永久变形及高回弹的导电屏蔽硅橡胶密封材料,以经偶联剂表面处理的炭黑作补强剂及导电填料,乙烯基硅橡胶生胶作基料,制备出一种导电炭黑/硅橡胶复合材料。研究了不同炭黑含量的导电炭黑/硅橡胶复合材料的力学性能、弹性、分散性以及电性能,采用SEM观察了炭黑在硅橡胶基体中的分布形貌,分析了导电炭黑/硅橡胶复合材料的导电机制及屏蔽机制。结果表明:随着炭黑含量的增加,导电炭黑/硅橡胶复合材料的Shore A硬度由31增至70;拉伸强度先由3.31 MPa增至5.28 MPa,而后趋于稳定;拉断伸长率先由198%增至297%,然后再减小至210%;恒定压缩永久变形量先减小后增大,瞬间回弹率逐渐减小;由于“炭黑簇”的形成及导电通路的完善,导电炭黑/硅橡胶复合材料的导电性能及屏蔽效能增强。
In order to obtain a conductive silicone rubber sealing material with low compression, permanent deformation and high resilience, carbon black surface-treated with a coupling agent is used as a reinforcing agent and a conductive filler, and the vinyl silicone rubber is used as a base material to prepare A conductive carbon black / silicone rubber composite. The mechanical properties, elastic properties, dispersibility and electrical properties of conductive carbon black / silicone rubber composites with different carbon black contents were studied. The distribution morphology of carbon black in silicon rubber matrix was observed by SEM. The effects of conductive carbon black / Conductive Mechanism and Shielding Mechanism of Rubber Composites. The results show that with the increase of carbon black content, the Shore A hardness of conductive carbon black / silicone rubber composites increases from 31 to 70, the tensile strength increases from 3.31 MPa to 5.28 MPa, and then tends to be stable. Elongation at break First increased from 198% to 297%, then decreased to 210%; constant compression set first decreased and then increased, the instantaneous rebound rate decreased gradually; due to the formation of “carbon black cluster” and the conductive path Perfect, conductive carbon black / silicon rubber composite conductive properties and shielding effectiveness enhancement.