为提高环氧导电油墨的柔韧性,采用三元氯醋树脂(E15/45M)对环氧树脂E51增韧改性,并以2-乙基4-甲基咪唑(2E4MI)为固化剂,银包铜粉为导电填料,制备柔性导电油墨.结果表明:导电油墨的体积电阻率随导电填料的用量增加而降低.随2E4MI用量的增加,导电油墨的体积电阻率呈现先降低后增加的趋势,2E4MI与E51的最佳质量比为1∶5.进一步探讨发现导电油墨的最佳固化温度和时间分别为105℃和2.5h.E15/45M不仅可以提高导电油墨的柔韧性,还可以有效降低体积电阻率.随着E15/45M用量增加,E15/45M/E51-2E4MI胶膜的玻璃化转变温度从91.5℃降低至58.0℃,导电油墨的体积电阻率从27.5×10-4Ω·cm降低至9.50×10 4Ω·cm.E51-2E4MI与E15/45M的质量比为50∶50,导电填料用量为70wt％时,导电油墨体积电阻率达到9.57×10-4 Ω·cm,附着力等级为0,涂层反复折叠20次后电阻变化率小于80％.因此采用E15/45M增韧环氧树脂既可以提高导电油墨的柔韧性又可以改善其导电性.
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