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文章以乙烯-乙酸乙烯酯(EVA)和低密度聚乙烯(LDPE)为主基体,特导炭黑(HG-1P)和乙炔炭黑(ACET)为导电填料,偶氮二甲酰胺(AC)为发泡剂,过氧化二异丙苯(DCP)为交联剂,制备了EVA/LDPE/炭黑(CB)导电泡沫复合材料。研究了此复合材料的泡孔结构、阻温特性,并分析了炭黑质量含量、不同配比EVA/LDPE、发泡剂、交联剂对复合材料电性能的影响。结果发现特导HG-1P的导电性高于ACET,由其填充的聚合物导电性优于乙炔炭黑;随着LDPE在共混物中的含量增加,复合材料的NTC强度减弱。制备的导电泡沫具有比较理想的泡孔结构,经过升温电阻测试,EVA/LDPE/CB导电发泡复合材料具有良好的开关特性,呈现明显的NTC特性。确定了发泡剂及交联剂的合适用量,从而获得既具有良好的泡沫性能,又有良好NTC特性的导电泡沫材料。
In this paper, ethylene-vinyl acetate (EVA) and low-density polyethylene (LDPE) as main matrix, special conducting carbon black (HG-1P) and acetylene black (ACET) as conductive fillers and azodicarbonamide (AC) For the foaming agent, dicumyl peroxide (DCP) as crosslinking agent, EVA / LDPE / carbon black (CB) conductive foam composites were prepared. The cell structure and temperature-resistance properties of the composites were studied. The effects of carbon black content, different ratios of EVA / LDPE, foaming agent and crosslinking agent on the electrical properties of the composites were also studied. The results show that the conductive HG-1P is more conductive than ACET. The polymer filled by the conductive HG-1P is more conductive than acetylene black. As the content of LDPE in the blend increases, the NTC strength of the composite decreases. The prepared conductive foam has an ideal cell structure. After the heating resistance test, the EVA / LDPE / CB conductive foam composite has good switching characteristics and exhibits obvious NTC characteristics. The appropriate amount of blowing agent and crosslinking agent was determined to obtain a conductive foam having both good foam properties and good NTC properties.