聚乙烯泡沫塑料具有良好的緩沖性能、熱導率低隔熱性能好、耐侯性好、耐老化好等優點已經被廣泛應用于農業工業,汽車電子及民用等各個方面。但是隨著聚乙烯泡沫塑料被應用到越來越多的高性能泡沫膠帶產品和復合材料中去時,其表面處理的問題正在被越來越廣泛得關注。本文將討論聚乙烯泡沫塑料的電暈處理處理技術應用現狀。

與傳統的濕態(tai)化學方法(fa)相(xiang)比,電暈(yun)法(fa)成(cheng)本低(di)且可以在常(chang)溫(wen)度非液(ye)態(tai)環境下運行從而改變聚乙(yi)烯泡棉(mian)的表面性能。在近幾年,隨著電暈(yun)設備制造商的技術(shu)日趨成(cheng)熟,電暈(yun)處理(li)已(yi)經成(cheng)為聚乙(yi)烯泡沫塑料表面處理(li)技術(shu)中被廣泛(fan)采(cai)用(yong)且十分有效的處理(li)方法(fa)。

電(dian)(dian)暈(yun)處(chu)(chu)(chu)理(li)(li)(li)是一(yi)(yi)種電(dian)(dian)擊處(chu)(chu)(chu)理(li)(li)(li),它利用(yong)(yong)(yong)高(gao)(gao)頻(pin)高(gao)(gao)電(dian)(dian)壓在被處(chu)(chu)(chu)理(li)(li)(li)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)電(dian)(dian)暈(yun)放電(dian)(dian)使被處(chu)(chu)(chu)理(li)(li)(li)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)發(fa)生(sheng)(sheng)變(bian)(bian)化從而(er)改(gai)變(bian)(bian)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)性能(neng)(neng)。最新研究表(biao)(biao)明(ming)導致電(dian)(dian)暈(yun)處(chu)(chu)(chu)理(li)(li)(li)后(hou)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)性能(neng)(neng)改(gai)變(bian)(bian)的(de)(de)(de)(de)(de)因(yin)素主(zhu)要有以下幾種化學(xue)變(bian)(bian)化化學(xue)變(bian)(bian)化中主(zhu)要的(de)(de)(de)(de)(de)作用(yong)(yong)(yong)是氧(yang)(yang)化作用(yong)(yong)(yong),活化氧(yang)(yang)與聚合(he)(he)物(wu)(wu)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)分(fen)子(zi)(zi)(zi)反應生(sheng)(sheng)成(cheng)(cheng)(cheng)(cheng)含氧(yang)(yang)官(guan)能(neng)(neng)團從而(er)大幅增加(jia)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)能(neng)(neng)提(ti)高(gao)(gao)粘接性能(neng)(neng)。其(qi)次是表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)分(fen)子(zi)(zi)(zi)發(fa)生(sheng)(sheng)交聯限制部分(fen)分(fen)子(zi)(zi)(zi)的(de)(de)(de)(de)(de)運動(dong)增加(jia)其(qi)分(fen)子(zi)(zi)(zi)量(liang)(liang)形成(cheng)(cheng)(cheng)(cheng)大分(fen)子(zi)(zi)(zi)量(liang)(liang)層(ceng),大分(fen)子(zi)(zi)(zi)量(liang)(liang)層(ceng)一(yi)(yi)會將(jiang)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)的(de)(de)(de)(de)(de)薄(bo)弱界面(mian)(mian)(mian)(mian)(mian)(mian)(mian)層(ceng)油脂,蠟(la)類及低分(fen)子(zi)(zi)(zi)析出物(wu)(wu)破壞以起到(dao)清潔表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)提(ti)高(gao)(gao)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)能(neng)(neng)的(de)(de)(de)(de)(de)作用(yong)(yong)(yong)。物(wu)(wu)理(li)(li)(li)變(bian)(bian)化表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)形貌改(gai)變(bian)(bian)是提(ti)高(gao)(gao)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)能(neng)(neng)的(de)(de)(de)(de)(de)主(zhu)要原因(yin)。電(dian)(dian)暈(yun)放電(dian)(dian)是一(yi)(yi)種高(gao)(gao)能(neng)(neng)量(liang)(liang)粒子(zi)(zi)(zi)轟(hong)擊聚合(he)(he)物(wu)(wu)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)的(de)(de)(de)(de)(de)過程,表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)會形成(cheng)(cheng)(cheng)(cheng)微小的(de)(de)(de)(de)(de)斑(ban)點,造(zao)成(cheng)(cheng)(cheng)(cheng)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)粗(cu)化以提(ti)高(gao)(gao)粘結效果。永久(jiu)極化駐極體形成(cheng)(cheng)(cheng)(cheng)將(jiang)聚乙烯置于強電(dian)(dian)場中時介電(dian)(dian)質會誘(you)導出電(dian)(dian)流(liu),這個永久(jiu)極化的(de)(de)(de)(de)(de)駐極現象會使材料表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)產生(sheng)(sheng)自(zi)粘性。由駐極體形成(cheng)(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)表(biao)(biao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)電(dian)(dian)荷隨時間而(er)衰(shuai)減(jian)且(qie)在高(gao)(gao)溫下加(jia)快衰(shuai)減(jian),所(suo)以自(zi)粘強度會隨時間延長而(er)減(jian)弱。

對于聚乙烯泡沫塑料的(de)電暈(yun)表面處理(li)來說(shuo),氧(yang)化作用及永(yong)久極(ji)化駐極(ji)體的(de)效果會是主要效果。

電(dian)暈處(chu)理(li)在(zai)聚乙烯泡沫塑料中的應用

因(yin)(yin)為(wei)聚乙(yi)烯泡沫(mo)(mo)塑(su)料(liao)(liao)的(de)許多特(te)性與薄(bo)膜(mo)有著(zhu)非常大的(de)差別,比如強度(du)密度(du)等性能。因(yin)(yin)此(ci)電暈(yun)(yun)技術在應用到處(chu)(chu)(chu)理(li)(li)聚乙(yi)烯泡沫(mo)(mo)塑(su)料(liao)(liao)表面時(shi),會有一(yi)些與處(chu)(chu)(chu)理(li)(li)薄(bo)膜(mo)的(de)不同(tong)之處(chu)(chu)(chu)。處(chu)(chu)(chu)理(li)(li)聚乙(yi)烯泡沫(mo)(mo)塑(su)料(liao)(liao)電暈(yun)(yun)設備及(ji)工藝(yi)的(de)選用與普(pu)通(tong)處(chu)(chu)(chu)理(li)(li)薄(bo)膜(mo)的(de)電暈(yun)(yun)處(chu)(chu)(chu)理(li)(li)會有所(suo)不同(tong)。一(yi)般來說普(pu)通(tong)薄(bo)膜(mo)的(de)處(chu)(chu)(chu)理(li)(li)功(gong)(gong)率需在10KV以上,而泡沫(mo)(mo)塑(su)料(liao)(liao)的(de)處(chu)(chu)(chu)理(li)(li)功(gong)(gong)率則(ze)只需在2KV左右便可完成。因(yin)(yin)為(wei)普(pu)通(tong)泡沫(mo)(mo)塑(su)料(liao)(liao)的(de)表面強度(du)非常低,高功(gong)(gong)率的(de)處(chu)(chu)(chu)理(li)(li)很容(rong)易將泡沫(mo)(mo)擊穿或燒焦。因(yin)(yin)此(ci)通(tong)常來說,電暈(yun)(yun)處(chu)(chu)(chu)理(li)(li)泡沫(mo)(mo)塑(su)料(liao)(liao)的(de)速度(du)比較慢以保證處(chu)(chu)(chu)理(li)(li)質量。

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