填充导电炭黑与乙炔炭黑的聚氨酯涂层导电性研究

Comparative Study of Electrical Conductivity of Super-conductive Carbon Black and Acetylene Black Filled Coating

选用了2种炭黑,以聚氨酯树脂为基体,制备了2种导电涂层,对此研究了超导电炉法炭黑EC-600JD和乙炔炭黑在树脂中的最大填充量及对应的电阻率,并对2种炭黑填充涂层的电阻温度稳定性和性能差异原因进行了分析。结果表明,乙炔炭黑更易分散在聚氨酯中,在最大填充量下,乙炔炭黑填充涂层具有电阻率,非常好的温度稳定性;乙炔炭黑表面含有较多的含氧基团,在涂层中形成的导电网络结构与EC-600JD存在差异是导致涂层性能差异的可能原因。

Conductive coating was prepared by filling carbon black into polyurethane matrix. The maximal weight fraction of the super-conductive carbon black EC-600JD and acetylene black were studied respectively. The corresponding mininalresistivity was measured. The temperature stability of the conductive coatings was tested and the causation of performance difference between the coatings was analyzed. It was found that the dispersibility of acetylene black into the polyurethane matrix is better than that of EC-600JD. Under the maximal weight fraction, the acetylene black filled coating has lower electric resistivity and its temperature stability is excellent. The performance difference between the coatings may base on two facts, or ore are more oxygenous radical on the acetylene black surface, and conductive network structure of the coatings is by far different from each other.