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以低密度聚乙烯(LDPE)和乙烯-乙酸乙烯酯(EVA)为主基体,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LDPE/EVA/CB导电泡沫复合材料。研究了此复合材料的泡孔结构、渗流阀值、阻温特性。并分析了不同炭黑填充量、不同LDPE/EVA配比、相同基体配比发泡与否对复合材料阻温性能的影响。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,发现LDPE/EVA/ACET导电发泡复合材料具有良好的开关特性,呈现明显的PTC特性。确定了LDPE/EVA的合理配比及ACET、AC、DCP的适宜用量,从而获得了既具有优良的泡沫性能,又有良好PTC特性的导电泡沫材料。
Low-density polyethylene (LDPE) and ethylene-vinyl acetate (EVA) as the main matrix, acetylene black (ACET) as conductive filler, azodicarbonamide (AC) as a blowing agent, dicumyl peroxide (DCP) as cross-linking agent was prepared LDPE / EVA / CB conductive foam composites. The cell structure, seepage threshold and temperature resistance of the composite were studied. The effects of different carbon black loadings, different LDPE / EVA ratios and foaming with the same matrix ratio on the thermal resistance of the composites were analyzed. The prepared conductive foam has an ideal cell structure. After temperature resistance test, it is found that LDPE / EVA / ACET conductive foam composite has good switching characteristics and exhibits obvious PTC characteristics. The rational ratio of LDPE / EVA and the suitable dosage of ACET, AC and DCP were determined, so as to obtain the conductive foam with excellent foam properties and good PTC characteristics.