最重要的導電膠

　銀(yin)(yin)(yin)(yin)粉(fen)填(tian)充型導(dao)電(dian)(dian)(dian)膠 是目前最(zui)重要(yao)的(de)(de)導(dao)電(dian)(dian)(dian)膠，作(zuo)為膠液基體的(de)(de)，有(you)環氧樹(shu)脂(zhi)、酚醛樹(shu)脂(zhi)、聚氨酯、丙烯(xi)酸(suan)酯樹(shu)脂(zhi)等(deng)。由(you)于環氧樹(shu)脂(zhi)的(de)(de)膠接性(xing)能(neng)(neng)(neng)優良，使(shi)用(yong)(yong)(yong)方(fang)(fang)便，因此(ci)在(zai)導(dao)電(dian)(dian)(dian)膠中用(yong)(yong)(yong)得最(zui)為普遍。銀(yin)(yin)(yin)(yin)粉(fen)填(tian)充 型導(dao)電(dian)(dian)(dian)膠中所用(yong)(yong)(yong)銀(yin)(yin)(yin)(yin)粉(fen)的(de)(de)種類、比例(li)、粒度(du)(du)及形(xing)狀對 導(dao)電(dian)(dian)(dian)膠 的(de)(de)性(xing)能(neng)(neng)(neng)有(you)很(hen)大影響。按(an)照制(zhi)造(zao)方(fang)(fang)法，銀(yin)(yin)(yin)(yin)粉(fen)可分為電(dian)(dian)(dian)解(jie)銀(yin)(yin)(yin)(yin)粉(fen)、化(hua)(hua)(hua)學(xue)還原銀(yin)(yin)(yin)(yin)粉(fen)、球磨銀(yin)(yin)(yin)(yin)粉(fen)和(he)噴射銀(yin)(yin)(yin)(yin)粉(fen)等(deng)多種，目前用(yong)(yong)(yong)得較多的(de)(de)是電(dian)(dian)(dian)解(jie)銀(yin)(yin)(yin)(yin)粉(fen)和(he)化(hua)(hua)(hua)學(xue)還原 銀(yin)(yin)(yin)(yin)粉(fen)。銀(yin)(yin)(yin)(yin)分子遷移現象是膠液固(gu)化(hua)(hua)(hua)后，在(zai)直流(liu)電(dian)(dian)(dian)場作(zuo)用(yong)(yong)(yong)下和(he)濕(shi)氣條件下，銀(yin)(yin)(yin)(yin)分子產(chan)生(sheng)(sheng)電(dian)(dian)(dian)解(jie)運動所造(zao)成(cheng)的(de)(de)電(dian)(dian)(dian)阻率改變的(de)(de)現象。一(yi)般在(zai)用(yong)(yong)(yong)于層(ceng)壓材料、陶瓷、玻璃(li)鋼(gang)為基材的(de)(de)印刷電(dian)(dian)(dian)路上較易發生(sheng)(sheng)。銀(yin)(yin)(yin)(yin)粉(fen)的(de)(de)用(yong)(yong)(yong) 量，通(tong)常(chang)(chang)為60-70％左右(you)。如銀(yin)(yin)(yin)(yin)粉(fen)的(de)(de)用(yong)(yong)(yong)量過少，則膠接強(qiang)(qiang)度(du)(du)可得到(dao)保證，但導(dao)電(dian)(dian)(dian)性(xing)能(neng)(neng)(neng)下降(jiang)；銀(yin)(yin)(yin)(yin)粉(fen)的(de)(de)用(yong)(yong)(yong)量過多，則導(dao)電(dian)(dian)(dian)性(xing)能(neng)(neng)(neng)增加(jia)，但膠接強(qiang)(qiang)度(du)(du)明顯下降(jiang)，成(cheng)本也相應增高(gao)(gao)。通(tong)常(chang)(chang)情況而(er)言，銀(yin)(yin)(yin)(yin)粉(fen)填(tian)充型導(dao)電(dian)(dian)(dian)膠 的(de)(de)固(gu)化(hua)(hua)(hua)溫(wen)度(du)(du)越高(gao)(gao)，固(gu)化(hua)(hua)(hua)速(su)度(du)(du)越快，則膠接強(qiang)(qiang)度(du)(du)越高(gao)(gao)，導(dao)電(dian)(dian)(dian)性(xing)越好(hao)，但施(shi)工工藝較為復雜；如果室(shi)溫(wen)固(gu)化(hua)(hua)(hua)，則固(gu)化(hua)(hua)(hua)時(shi)間(jian)長，膠接強(qiang)(qiang)度(du)(du)和(he)導(dao)電(dian)(dian)(dian)性(xing)均會受到(dao)影響，但施(shi)工方(fang)(fang)便。