最重要的導電膠

　　銀(yin)(yin)粉(fen)(fen)(fen)(fen)填(tian)充型導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao) 是(shi)目前(qian)最重(zhong)要的(de)(de)(de)(de)導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao)，作(zuo)為膠(jiao)(jiao)(jiao)(jiao)液(ye)基(ji)(ji)體的(de)(de)(de)(de)，有環(huan)氧(yang)樹脂(zhi)、酚醛(quan)樹脂(zhi)、聚氨酯(zhi)、丙烯酸酯(zhi)樹脂(zhi)等。由于(yu)環(huan)氧(yang)樹脂(zhi)的(de)(de)(de)(de)膠(jiao)(jiao)(jiao)(jiao)接性(xing)(xing)能(neng)優良，使用(yong)(yong)方(fang)(fang)便，因此在(zai)導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao)中用(yong)(yong)得(de)最為普遍。銀(yin)(yin)粉(fen)(fen)(fen)(fen)填(tian)充 型導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao)中所用(yong)(yong)銀(yin)(yin)粉(fen)(fen)(fen)(fen)的(de)(de)(de)(de)種類(lei)、比例、粒度及形狀(zhuang)對 導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao) 的(de)(de)(de)(de)性(xing)(xing)能(neng)有很大影(ying)響。按照制(zhi)造方(fang)(fang)法，銀(yin)(yin)粉(fen)(fen)(fen)(fen)可分為電(dian)(dian)(dian)(dian)解銀(yin)(yin)粉(fen)(fen)(fen)(fen)、化(hua)(hua)(hua)學還原(yuan)銀(yin)(yin)粉(fen)(fen)(fen)(fen)、球磨銀(yin)(yin)粉(fen)(fen)(fen)(fen)和(he)噴(pen)射銀(yin)(yin)粉(fen)(fen)(fen)(fen)等多種，目前(qian)用(yong)(yong)得(de)較多的(de)(de)(de)(de)是(shi)電(dian)(dian)(dian)(dian)解銀(yin)(yin)粉(fen)(fen)(fen)(fen)和(he)化(hua)(hua)(hua)學還原(yuan) 銀(yin)(yin)粉(fen)(fen)(fen)(fen)。銀(yin)(yin)分子(zi)遷移現(xian)象是(shi)膠(jiao)(jiao)(jiao)(jiao)液(ye)固化(hua)(hua)(hua)后，在(zai)直流電(dian)(dian)(dian)(dian)場作(zuo)用(yong)(yong)下和(he)濕氣(qi)條件(jian)下，銀(yin)(yin)分子(zi)產生電(dian)(dian)(dian)(dian)解運動所造成的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)阻率改變的(de)(de)(de)(de)現(xian)象。一般在(zai)用(yong)(yong)于(yu)層壓材料、陶瓷、玻(bo)璃鋼為基(ji)(ji)材的(de)(de)(de)(de)印刷電(dian)(dian)(dian)(dian)路上較易發生。銀(yin)(yin)粉(fen)(fen)(fen)(fen)的(de)(de)(de)(de)用(yong)(yong) 量(liang)，通常為60-70％左(zuo)右(you)。如銀(yin)(yin)粉(fen)(fen)(fen)(fen)的(de)(de)(de)(de)用(yong)(yong)量(liang)過(guo)(guo)少，則(ze)(ze)膠(jiao)(jiao)(jiao)(jiao)接強(qiang)度可得(de)到保(bao)證，但導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)性(xing)(xing)能(neng)下降；銀(yin)(yin)粉(fen)(fen)(fen)(fen)的(de)(de)(de)(de)用(yong)(yong)量(liang)過(guo)(guo)多，則(ze)(ze)導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)性(xing)(xing)能(neng)增加，但膠(jiao)(jiao)(jiao)(jiao)接強(qiang)度明顯下降，成本也相(xiang)應增高(gao)(gao)。通常情況而言，銀(yin)(yin)粉(fen)(fen)(fen)(fen)填(tian)充型導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)膠(jiao)(jiao)(jiao)(jiao) 的(de)(de)(de)(de)固化(hua)(hua)(hua)溫(wen)(wen)度越(yue)高(gao)(gao)，固化(hua)(hua)(hua)速度越(yue)快，則(ze)(ze)膠(jiao)(jiao)(jiao)(jiao)接強(qiang)度越(yue)高(gao)(gao)，導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)性(xing)(xing)越(yue)好，但施工(gong)工(gong)藝較為復(fu)雜；如果室溫(wen)(wen)固化(hua)(hua)(hua)，則(ze)(ze)固化(hua)(hua)(hua)時間長，膠(jiao)(jiao)(jiao)(jiao)接強(qiang)度和(he)導(dao)(dao)(dao)電(dian)(dian)(dian)(dian)性(xing)(xing)均會(hui)受(shou)到影(ying)響，但施工(gong)方(fang)(fang)便。