具有PTC特性的复合自润滑导电塑料

Self lubricating Conducting Composite Materials with PTC Characteristics

研制了低密度聚乙烯碳黑基的复合导电材料。向其中同时加入固体润滑剂聚四氟乙烯、石墨和 Ｅｋｏｎｏｌ（即 Ｐｏｌｙｏｘｙｂｅｎｚｙｌｅｎｅ 的商品名，简称 Ｐ Ｏ Ｂ）的一种或几种构成了复合自润滑导电材料。固体润滑剂的加入并未破坏材料的正温度系数特性，只是不同程度上降低了材料的电阻率，以加入 Ｅｋｏｎｏｌ降低幅度最大。但因润滑剂为弥散复合，随润滑剂的含量增大，材料的耐击穿电压降低。在较为稳定的电压作用下，该材料具有较好的恒温能力。

LDPE CB matrix composite conductive materials are studied. CSLC (composite self lubricating conductive materials) are composed of LDPE CB matrix added to gether with solid lubricants such as PTFE, Graphite and Ekonol. The PTC property of CSLC is not destroyed and the resistivity decreases by solid lubricants remarkedly. lubricants increasing, The breakdown voltages of CSLC decrease along with the increasing content of lubricants. When the applied voltage is stable, the CSLC is of a characteristic of controlling temperature.