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基材處理包括打磨、去毛刺和密(mi)封三個步驟(zou)。
1. 打(da)磨
待涂(tu)裝的(de)一(yi)般木材表面應先用(yong)(yong)200#砂紙(zhi)(zhi)初步打(da)磨后(hou)再用(yong)(yong)600#砂紙(zhi)(zhi)打(da)磨,使其平整(zheng)光滑。細木工件可直接(jie)用(yong)(yong)600#砂紙(zhi)(zhi)打(da)磨。細砂紙(zhi)(zhi)打(da)磨會使木紋(wen)(wen)緊密(mi),減少木紋(wen)(wen)起粒現(xian)象(xiang)。
2. 去(qu)毛刺
木(mu)(mu)材(cai)(cai)著水后(hou),水沿(yan)木(mu)(mu)纖維管和木(mu)(mu)紋中的(de)微隙滲入,使其膨脹變大,突出(chu)木(mu)(mu)材(cai)(cai)表面,干后(hou)不(bu)能(neng)復原。所(suo)以木(mu)(mu)材(cai)(cai)涂(tu)水性漆后(hou)會出(chu)現(xian)木(mu)(mu)紋突起、起顆粒、生毛刺(ci)等(deng)現(xian)象(xiang)。有兩(liang)種方法可以消(xiao)除或減少涂(tu)道水性漆后(hou)出(chu)現(xian)起粒和毛刺(ci)現(xian)象(xiang)。
用可擠出(chu)水的(de)濕(shi)布揩擦待涂(tu)(tu)木面,使(shi)木材表面充分潤(run)濕(shi),晾干(gan)(gan)后用細砂紙打(da)(da)磨掉形成的(de)毛刺和顆粒。然后涂(tu)(tu)一道(dao)底漆(qi),干(gan)(gan)后用400#左右的(de)砂紙輕輕打(da)(da)磨。對多孔木材要(yao)涂(tu)(tu)兩道(dao)底漆(qi)后再(zai)打(da)(da)磨,這時道(dao)底漆(qi)應加5%~10%的(de)水稀釋后再(zai)用。
用(yong)(yong)(yong)無(wu)蠟蟲(chong)膠(jiao)(jiao)漆(qi)(qi)封閉木材表面(mian)(mian)(mian)。這(zhe)種方法比水濕(shi)法好,除了可防(fang)止(zhi)涂(tu)(tu)(tu)(tu)水性(xing)漆(qi)(qi)產生起粒(li)、長毛(mao)刺外,還可增加木材的(de)(de)(de)層次感。但是(shi),由(you)于蟲(chong)膠(jiao)(jiao)本(ben)身的(de)(de)(de)顏色,往往會使(shi)木材帶上(shang)淡淡的(de)(de)(de)琥珀色。蟲(chong)膠(jiao)(jiao)漆(qi)(qi)封底對舊漆(qi)(qi)面(mian)(mian)(mian)和可能已被油脂(zhi)、脫模(mo)劑、有機硅(gui)化合物污染的(de)(de)(de)木材表面(mian)(mian)(mian)十分(fen)有用(yong)(yong)(yong),可防(fang)止(zhi)涂(tu)(tu)(tu)(tu)水性(xing)漆(qi)(qi)產生縮孔(kong)(kong)、魚眼(yan)等施工(gong)(gong)弊病。涂(tu)(tu)(tu)(tu)裝(zhuang)過程(cheng)中如果發現涂(tu)(tu)(tu)(tu)裝(zhuang)面(mian)(mian)(mian),尤其是(shi)舊漆(qi)(qi)面(mian)(mian)(mian)涂(tu)(tu)(tu)(tu)漆(qi)(qi)后有縮孔(kong)(kong)和魚眼(yan)現象時,應擦去(qu)已涂(tu)(tu)(tu)(tu)的(de)(de)(de)水性(xing)漆(qi)(qi),打(da)磨(mo)(mo)后用(yong)(yong)(yong)脫蠟蟲(chong)膠(jiao)(jiao)漆(qi)(qi)封底,然后再(zai)涂(tu)(tu)(tu)(tu)水性(xing)漆(qi)(qi)。蟲(chong)膠(jiao)(jiao)漆(qi)(qi)是(shi)蟲(chong)膠(jiao)(jiao)的(de)(de)(de)酒精(jing)溶液,可用(yong)(yong)(yong)刷涂(tu)(tu)(tu)(tu)或(huo)擦涂(tu)(tu)(tu)(tu)法施工(gong)(gong)。封底后用(yong)(yong)(yong)400#以上(shang)的(de)(de)(de)砂紙打(da)磨(mo)(mo),再(zai)用(yong)(yong)(yong)酒精(jing)或(huo)濕(shi)布擦拭凈打(da)磨(mo)(mo)面(mian)(mian)(mian),這(zhe)樣可增加面(mian)(mian)(mian)漆(qi)(qi)的(de)(de)(de)附著力(li)。
3. 密(mi)封
水(shui)(shui)性(xing)(xing)膩(ni)(ni)(ni)子(zi)(zi)(zi)的(de)(de)作用(yong)(yong)是對木(mu)(mu)材(cai)(cai)等基材(cai)(cai)表(biao)面(mian)(mian)不(bu)(bu)十分規整(zheng)(zheng)平(ping)(ping)滑(hua)處(chu)及微(wei)小的(de)(de)缺陷和(he)毛病,如(ru)細孔(kong)(kong)、微(wei)細裂紋、凹坑、接縫和(he)瑕疵進(jin)行填(tian)充找補,降(jiang)低表(biao)面(mian)(mian)粗(cu)糙度(du),增(zeng)加平(ping)(ping)整(zheng)(zheng)性(xing)(xing)。對水(shui)(shui)性(xing)(xing)膩(ni)(ni)(ni)子(zi)(zi)(zi)的(de)(de)要(yao)求是附著力(li)和(he)填(tian)充性(xing)(xing)要(yao)好、易打(da)(da)磨、透明度(du)好、不(bu)(bu)影響上層漆(qi)(qi)的(de)(de)涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)。水(shui)(shui)性(xing)(xing)膩(ni)(ni)(ni)子(zi)(zi)(zi)多(duo)為單組分的(de)(de)。膩(ni)(ni)(ni)子(zi)(zi)(zi)將(jiang)木(mu)(mu)材(cai)(cai)表(biao)面(mian)(mian)的(de)(de)微(wei)孔(kong)(kong)封(feng)固后(hou)不(bu)(bu)僅可(ke)(ke)以增(zeng)加漆(qi)(qi)膜的(de)(de)豐滿度(du),還(huan)可(ke)(ke)減少涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)過程巾產(chan)生(sheng)氣泡(pao)。這(zhe)是因(yin)為涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)時(shi)漆(qi)(qi)液會將(jiang)空氣封(feng)堵在微(wei)孔(kong)(kong)中,干(gan)燥過程中環境溫度(du)的(de)(de)微(wei)小升(sheng)高使(shi)得(de)氣泡(pao)膨脹(zhang),從而使(shi)漆(qi)(qi)面(mian)(mian)產(chan)生(sheng)明顯的(de)(de)氣泡(pao),這(zhe)種(zhong)現象在水(shui)(shui)性(xing)(xing)木(mu)(mu)器(qi)漆(qi)(qi)涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)中是十分常見的(de)(de)。膩(ni)(ni)(ni)子(zi)(zi)(zi)適(shi)用(yong)(yong)于厚膜涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)和(he)色漆(qi)(qi)涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)。對開放式(shi)涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang),即要(yao)求顯露木(mu)(mu)紋和(he)微(wei)孔(kong)(kong)的(de)(de)涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)效果,不(bu)(bu)得(de)使(shi)用(yong)(yong)膩(ni)(ni)(ni)子(zi)(zi)(zi)封(feng)底。膩(ni)(ni)(ni)子(zi)(zi)(zi)用(yong)(yong)前(qian)攪勻(yun)。膩(ni)(ni)(ni)子(zi)(zi)(zi)可(ke)(ke)用(yong)(yong)刷(shua)涂(tu)(tu)(tu)或(huo)刮(gua)涂(tu)(tu)(tu)法施工,多(duo)用(yong)(yong)刷(shua)涂(tu)(tu)(tu)法,可(ke)(ke)適(shi)應(ying)各種(zhong)形狀的(de)(de)表(biao)面(mian)(mian)。視(shi)木(mu)(mu)材(cai)(cai)表(biao)面(mian)(mian)粗(cu)糙度(du)不(bu)(bu)同可(ke)(ke)刷(shua)1~3道膩(ni)(ni)(ni)子(zi)(zi)(zi)。特別(bie)不(bu)(bu)平(ping)(ping)整(zheng)(zheng)的(de)(de)表(biao)面(mian)(mian)還(huan)可(ke)(ke)多(duo)刷(shua),一(yi)般情況下刷(shua)兩道即可(ke)(ke),每道間(jian)隔至少0.5h(前(qian)一(yi)道實干(gan)后(hou)再(zai)刷(shua)第(di)二(er)道)。打(da)(da)磨不(bu)(bu)得(de)過度(du)用(yong)(yong)力(li),只需輕(qing)輕(qing)打(da)(da)磨去極不(bu)(bu)平(ping)(ping)整(zheng)(zheng)處(chu)再(zai)涂(tu)(tu)(tu)下一(yi)道膩(ni)(ni)(ni)子(zi)(zi)(zi)。膩(ni)(ni)(ni)子(zi)(zi)(zi)完工后(hou)放置(zhi)至少2h,用(yong)(yong)砂紙(zhi)打(da)(da)磨平(ping)(ping)滑(hua)(晾(liang)置(zhi)時(shi)問(wen)長一(yi)些(xie)更(geng)好打(da)(da)磨),好用(yong)(yong)1000#砂紙(zhi)水(shui)(shui)磨打(da)(da)平(ping)(ping)滑(hua)。但(dan)是,對水(shui)(shui)有可(ke)(ke)能引起(qi)木(mu)(mu)材(cai)(cai)翹曲、變形、開膠的(de)(de)場合(he),不(bu)(bu)得(de)進(jin)行水(shui)(shui)磨。水(shui)(shui)磨后(hou)沖洗干(gan)凈(jing),擦干(gan),晾(liang)干(gan)后(hou)才能進(jin)行下一(yi)步涂(tu)(tu)(tu)裝(zhuang)(zhuang)(zhuang)。大多(duo)數水(shui)(shui)性(xing)(xing)膩(ni)(ni)(ni)子(zi)(zi)(zi)固含(han)量都(dou)很低,對木(mu)(mu)材(cai)(cai)上的(de)(de)大縫隙(xi)和(he)凹坑難以填(tian)實,這(zhe)時(shi)應(ying)該采用(yong)(yong)高固含(han)量膩(ni)(ni)(ni)子(zi)(zi)(zi)或(huo)油(you)性(xing)(xing)膩(ni)(ni)(ni)子(zi)(zi)(zi)處(chu)理。

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