超高压电缆护套外表面高分子耐磨导电涂层制备与性能研究  

The Preparation and Properties of Conductive and Wear Resistant Polymer Coatings on Insulated Layer of Super-high Voltage Cable

作　　者：丁剑[1] 郭强[1] 潘国梁[1] 汪晓明[2] 

机构地区：[1]上海大学材料科学与工程学院,上海201800 [2]上海电缆研究所,上海200093

出　　处：《润滑与密封》2007年第7期38-41,共4页Lubrication Engineering

基　　金：上海市高新工程专项资金资助项目(SU-06-05).

摘　　要：超高压输电电缆塑料绝缘护套的安全可靠性必须通过在护套外表面涂覆导电涂层来测试,为了改进目前工程上普遍采取的导电石墨干粉涂抹方法形成检测干膜的明显不足,避免涂抹过程中污染环境和对操作人员造成粉尘伤害,防止碰擦而使干膜脱落或者玷污接触物,采用环氧树脂和导电石墨的复合配方,采取液相固化成膜的工艺路线,制备出用于检测的导电耐磨涂层。经涂层导电性和附着力试验表明,石墨含量增大到渗流临界值时,涂层开始具有导电性,石墨含量继续增大时,涂层表面电阻值显著下降,涂层附着力也逐渐降低,当石墨含量达到约1.5倍渗流临界值时,电阻值低达3650Ω且趋于稳定,涂层附着力最小。在M-2000型磨损试验机上对各种涂层的摩擦磨损特性研究表明,在环氧树脂基体中填充导电石墨不仅有效提高涂层导电性,同时起到减摩作用,改善涂层耐磨性。石墨含量约为1.25倍渗流临界值时涂层比磨损率最低为1.791×10-10mm3/(N.m)。通过扫描电镜对涂层划痕和磨痕形貌显微分析,探讨石墨含量对涂层附着力和摩擦学性能的影响机制。The security and reliability of plastic insulated layer of super-high voltage cable must be tested through certain exterior conductive coating that was formed up-to-date only by smearing with dry conductive graphite powder. The new types of liquid solidified conductive composite coatings on exterior plastic insulated layer of the cable with different prescriptions of epoxy resin and conductive graphite were prepared to replace the above-mentioned dry powder coating that has several demerits such as inducing environmental pollution and worker physical harmfulness during daubing process, worn away easily by transportation and pavement of the cable, and so on. It is shown by testing conductivity and adhesion of the developed coatings that the coating conductivity appeares evidently once conductive graphite content reached the seepage critical value （SCV） and increases with increasing amount of filled graphite, but the coating adhesion gradually decreases. The minimum electric resistance is 3 650 Ω when graphite content is 1.5 SCV. The friction and wear characteristics of these coatings were evaluated at M2000 tribo-tester. The results indicate that the graphite filled in epoxy resin can effectively improve the conductivity and wear resistance ,the specific wear rate reached minimum value 1. 791 ×10^-10mm^3/（N·m） when graphite content is 1.25 SCV, and the integrated properties of this composite coating is optimum. Based on morphology of worn surface observed by SEM, the wear mechanisms of the coatings were discussed.

关 键 词：超高压电缆 复合涂层 石墨 导电性能 耐磨性能 

分 类 号：TQ324[化学工程—合成树脂塑料工业]