低导电填料含量的PE/ENP全硫化热塑性弹性体导电性能研究  

Conductivity of PE/ENP thermoplastic vulcanizates with low content of conductive fillers

作　　者：陈刚[1,2] 张晓红[2] 乔金樑[1,2] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《化工新型材料》2015年第9期104-106,共3页New Chemical Materials

摘　　要：采用双螺杆挤出机将熔点高于聚乙烯(PE)的低熔点合金(LMPA)粉末填充到PE基体中,并将机头温度设定在LMPA熔点附近进行机头拉伸,使LMPA成为超细颗粒均匀分散在PE基体中。超细金属粒子受到PE基体的保护,不会被氧化。将含有LMPA超细颗粒的PE与纳米尺度橡胶粒子(ENP)共混制备出了导电性能得到改善的全硫化热塑性弹性体(TPV)。实验结果表明:多次反复进行机头拉伸、加入少量多壁碳纳米管(MWCNTs)或蒙脱土(MMT)等纳米材料,可使LMPA的粒径进一步减小、分散得更均匀,所制备的全硫化热塑性弹性体尽管含有的导电填料量很小,但导电性能得到明显改善。根据此研究结果,在一定量导电纳米填料的帮助下,通过多次进行机头拉伸,有希望制备出导电填料含量低的导电全硫化热塑性弹性体。Low melting point metal alloy（LMPA） powders with higher melting point than polyethylene （PE） were filled into PE matrix by using twin-screw extruder at temperature higher than the melting point of PE and lower than the melting point o{ I.MPA,followed by die drawing process at temperature around the melting point of LMPA. LMPA parti- cles were broken into ultra-fine particles during the die drawing process and protected from oxidation by PE matrix. The thermoplastic vulcanizates （TPVs） were prepared by blending the PE/LMPA composites with elastomeric nano-particles （ENP）. It was found that repeating die drawing process,adding small amount of multi wall carbon nanotubes （MWCNTs） or montmorillonite （MMT） could reduce the LMPA particle size further during the die drawing process and the conductivi ty of TPVs was enhanced further as well. Based on this study, thermoplastic vulcanizates with high conductivity were possi- ble to be produced by repeating die drawing process more times with the help of nano fillers.

关 键 词：全硫化热塑性弹性体 纳米材料 导电填料 机头拉伸 导电性 

分 类 号：TQ334[化学工程—橡胶工业]