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電泳涂裝技術的調控管理
發表于2012-11-19 13:59:58 放大 縮小

       溶劑(ji)含量(liang)(liang)電泳漆(qi)中(zhong)含有的(de)水(shui)溶性(xing)有機溶劑(ji)起助溶作(zuo)用,與其它(ta)涂料相比含量(liang)(liang)較小,可是它(ta)對膜厚(hou)(hou)和(he)涂料穩定性(xing)有一(yi)定影響,一(yi)般要求控制在一(yi)定范圍(wei)內。工作(zuo)液(ye)中(zhong)的(de)溶劑(ji)含量(liang)(liang)增高,膜厚(hou)(hou)增厚(hou)(hou),泳透(tou)力和(he)破裂電壓降低(di);溶劑(ji)含量(liang)(liang)偏低(di),膜厚(hou)(hou)下降,漆(qi)膜外觀(平滑性(xing))變差。工作(zuo)液(ye)中(zhong)溶劑(ji)含量(liang)(liang)的(de)高低(di)可通過加(jia)入溶劑(ji)和(he)更換超濾(lv)液(ye)來調整(zheng)。

       泳(yong)(yong)(yong)涂(tu)時(shi)間(jian)在(zai)(zai)(zai)電(dian)(dian)泳(yong)(yong)(yong)槽中的(de)泳(yong)(yong)(yong)涂(tu)時(shi)間(jian)是指被涂(tu)工(gong)件在(zai)(zai)(zai)工(gong)作(zuo)液液面下形成涂(tu)膜(mo)(mo)(通電(dian)(dian))的(de)時(shi)間(jian)。這一(yi)段時(shi)間(jian)一(yi)般限(xian)定(ding)在(zai)(zai)(zai)3min左右。隨(sui)泳(yong)(yong)(yong)涂(tu)時(shi)間(jian)增(zeng)(zeng)(zeng)長(chang),漆(qi)(qi)膜(mo)(mo)厚(hou)度增(zeng)(zeng)(zeng)厚(hou)。泳(yong)(yong)(yong)涂(tu)時(shi)間(jian)增(zeng)(zeng)(zeng)加或減少可(ke)(ke)以間(jian)接地影響(xiang)漆(qi)(qi)膜(mo)(mo)表面平整和外觀質量(liang)。泳(yong)(yong)(yong)涂(tu)時(shi)間(jian)在(zai)(zai)(zai)電(dian)(dian)泳(yong)(yong)(yong)涂(tu)裝工(gong)藝(yi)管理(li)中起重(zhong)要作(zuo)用,適當增(zeng)(zeng)(zeng)高(gao)泳(yong)(yong)(yong)涂(tu)電(dian)(dian)壓可(ke)(ke)縮(suo)短泳(yong)(yong)(yong)涂(tu)時(shi)間(jian),在(zai)(zai)(zai)較低(di)泳(yong)(yong)(yong)涂(tu)電(dian)(dian)壓時(shi)可(ke)(ke)增(zeng)(zeng)(zeng)長(chang)泳(yong)(yong)(yong)涂(tu)時(shi)間(jian),以保(bao)證漆(qi)(qi)膜(mo)(mo)的(de)厚(hou)度。

       泳(yong)(yong)涂(tu)(tu)(tu)電(dian)壓(ya)(ya)(ya)在(zai)電(dian)泳(yong)(yong)涂(tu)(tu)(tu)裝(zhuang)線(xian)中,泳(yong)(yong)涂(tu)(tu)(tu)電(dian)壓(ya)(ya)(ya)可(ke)控制(zhi)電(dian)泳(yong)(yong)涂(tu)(tu)(tu)裝(zhuang)過程的(de)(de)成膜速度和(he)沉積量,通常工(gong)作液溫度和(he)泳(yong)(yong)涂(tu)(tu)(tu)時(shi)間是一定的(de)(de),如果(guo)需要提高(gao)(gao)或降低膜厚,可(ke)通過提高(gao)(gao)或降低電(dian)壓(ya)(ya)(ya)來實現。在(zai)連(lian)續流(liu)水線(xian)生產式的(de)(de)電(dian)泳(yong)(yong)涂(tu)(tu)(tu)裝(zhuang)設備上,一般*通電(dian)區段(duan)的(de)(de)電(dian)壓(ya)(ya)(ya)控制(zhi)在(zai)工(gong)作電(dian)壓(ya)(ya)(ya)的(de)(de)下限以下,第(di)二區段(duan)的(de)(de)電(dian)壓(ya)(ya)(ya)控制(zhi)在(zai)工(gong)作電(dian)壓(ya)(ya)(ya)甚至略高(gao)(gao)一點。

       電泳后(hou)回(hui)收(shou)清洗(xi)被涂(tu)物在電泳后(hou)出(chu)槽(cao)時表面(mian)上附有(you)未(wei)泳涂(tu)上的(de)工作液(ye)(ye),如(ru)直(zhi)接(jie)烘干則(ze)產生(sheng)斑(ban)痕等漆(qi)膜弊病,若直(zhi)接(jie)出(chu)槽(cao)則(ze)產生(sheng)浪費。為消除漆(qi)膜弊病和回(hui)收(shou)工作液(ye)(ye),電泳涂(tu)裝(zhuang)后(hou)必須進行(xing)水洗(xi)。電泳后(hou)清洗(xi)可分兩個階段:回(hui)收(shou)帶出(chu)的(de)工作液(ye)(ye):在出(chu)槽(cao)口(kou)處用超(chao)濾(lv)液(ye)(ye)或去離子(zi)水清洗(xi),洗(xi)液(ye)(ye)直(zhi)接(jie)回(hui)槽(cao)內(nei),最(zui)好(hao)在被涂(tu)物出(chu)槽(cao)1min內(nei)即進行(xing)清洗(xi)。提高(gao)漆(qi)膜的(de)外觀性能:用循環超(chao)濾(lv)液(ye)(ye)沖洗(xi),通(tong)常洗(xi)23次,最(zui)終用去離子(zi)水沖洗(xi)。

       環氧(yang)封閉底漆(qi)為雙組(zu)分(fen)(fen),在使用(yong)前將甲乙(yi)組(zu)分(fen)(fen)嚴格按(an)照121比(bi)例配(pei)好,混合(he)攪拌均勻后即可使用(yong),涂(tu)(tu)(tu)刷(shua)于混凝土(tu)構件表面(mian),要求均勻一(yi)致(zhi)無漏刷(shua),26h后進(jin)行(xing)下道工序(xu)。將甲乙(yi)組(zu)分(fen)(fen)環氧(yang)瀝青(qing)防腐(fu)漆(qi)嚴格按(an)照31比(bi)例配(pei)好,混合(he)攪拌均勻后涂(tu)(tu)(tu)刷(shua)于雙組(zu)分(fen)(fen)環氧(yang)封閉底漆(qi)的表面(mian)上,施工兩道,要求均勻一(yi)致(zhi)無漏刷(shua),漆(qi)膜(mo)厚度達到100120m,1824h后進(jin)行(xing)下道工序(xu)涂(tu)(tu)(tu)刷(shua)。