一、低溫熱熔膠膜和高溫熱熔膠膜的區別
熱熔膠膜具有高(gao)溫(wen)低(di)溫(wen)的(de)區別,這主要是以(yi)熔點為依據來(lai)劃分的(de)。下(xia)面來(lai)介(jie)紹下(xia)熱熔膠(jiao)膜(mo)高(gao)溫(wen)與(yu)低(di)溫(wen)的(de)區別。
1、高溫熱熔膠膜類型
高(gao)溫(wen)熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)主要(yao)是(shi)指熔(rong)(rong)(rong)點(dian)溫(wen)度(du)比較高(gao)的熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo),其(qi)實(shi)高(gao)溫(wen)類型(xing)熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)只有高(gao)溫(wen)TPU熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo),熔(rong)(rong)(rong)點(dian)溫(wen)度(du)在150℃,使(shi)用(yong)溫(wen)度(du)在180℃左右。還有一(yi)些中高(gao)溫(wen)類型(xing)熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo),主要(yao)包括PA熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)(熔(rong)(rong)(rong)點(dian)120℃,使(shi)用(yong)溫(wen)度(du)150℃)、PES熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)(熔(rong)(rong)(rong)點(dian)溫(wen)度(du)115℃,使(shi)用(yong)溫(wen)度(du)140℃)和PO熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)(熔(rong)(rong)(rong)點(dian)在110℃,使(shi)用(yong)溫(wen)度(du)140℃左右)以及中溫(wen)TPU熱(re)(re)熔(rong)(rong)(rong)膠(jiao)(jiao)膜(mo)(熔(rong)(rong)(rong)點(dian)在110℃,使(shi)用(yong)溫(wen)度(du)在140℃)。
2、低溫熱熔膠膜類型
低(di)溫(wen)(wen)熱熔膠(jiao)膜(mo)(mo)(mo)指的(de)(de)(de)是(shi)熔點溫(wen)(wen)度(du)低(di)的(de)(de)(de)熱熔膠(jiao)膜(mo)(mo)(mo),除了中(zhong)高(gao)溫(wen)(wen)和高(gao)溫(wen)(wen)類型的(de)(de)(de),其他材(cai)質的(de)(de)(de)都(dou)屬于低(di)溫(wen)(wen)類型熱熔膠(jiao)膜(mo)(mo)(mo),主(zhu)要包括低(di)溫(wen)(wen)TPU熱熔膠(jiao)膜(mo)(mo)(mo)和EVA熱熔膠(jiao)膜(mo)(mo)(mo)。其中(zhong)低(di)溫(wen)(wen)TPU熱熔膠(jiao)膜(mo)(mo)(mo)的(de)(de)(de)熔點溫(wen)(wen)度(du)在(zai)70℃,有的(de)(de)(de)型號可低(di)至五(wu)六十度(du);而EVA的(de)(de)(de)熱熔膠(jiao)膜(mo)(mo)(mo)熔點主(zhu)要是(shi)在(zai)70攝氏度(du),低(di)的(de)(de)(de)型號可以達到四五(wu)十度(du),具有良(liang)好的(de)(de)(de)耐低(di)溫(wen)(wen)性(xing)能。
3、高溫與低溫熱熔膠膜的區別
兩者最(zui)大的區別(bie)就(jiu)是(shi)熔(rong)點(dian)(dian)不(bu)(bu)同(tong),除了熔(rong)點(dian)(dian)的不(bu)(bu)同(tong)之外,在性能和(he)使用(yong)范圍(wei)上也(ye)有(you)所不(bu)(bu)同(tong)。低溫(wen)熱(re)熔(rong)膠(jiao)膜(mo)主要是(shi)用(yong)在一些(xie)不(bu)(bu)耐高(gao)溫(wen)材質的材料復合中,而高(gao)溫(wen)熱(re)熔(rong)膠(jiao)膜(mo)主要應用(yong)在有(you)耐高(gao)溫(wen)要求的領域。整體來說的話,高(gao)溫(wen)熱(re)熔(rong)膠(jiao)膜(mo)的粘接性能會更好(hao)一點(dian)(dian),但(dan)是(shi)低溫(wen)熱(re)熔(rong)膠(jiao)膜(mo)可以更好(hao)地保護材料不(bu)(bu)受(shou)到熱(re)損傷。
二、熱熔膠膜高溫好還是低溫好
熱(re)(re)熔膠(jiao)(jiao)膜(mo)的特點是需要加(jia)熱(re)(re)熔化(hua)才具有黏性,冷卻硬化(hua)后(hou)才具有粘接強度。高溫(wen)熱(re)(re)熔膠(jiao)(jiao)膜(mo)顧名思義,就(jiu)是需要加(jia)熱(re)(re)的溫(wen)度高,相反(fan),低溫(wen)熱(re)(re)熔膠(jiao)(jiao)膜(mo)也就(jiu)是在低溫(wen)條(tiao)件(jian)下就(jiu)可以加(jia)熱(re)(re)熔化(hua)了。
因為熱熔(rong)膠膜(mo)(mo)達到(dao)一定(ding)溫(wen)度后就(jiu)(jiu)(jiu)會熔(rong)化(hua),熔(rong)化(hua)后,即使前期已經形成良好的(de)粘接,也(ye)會再(zai)一次失(shi)去粘接強度。所以,熱熔(rong)膠膜(mo)(mo)的(de)熔(rong)化(hua)溫(wen)度,也(ye)就(jiu)(jiu)(jiu)是接近它的(de)一個耐溫(wen)溫(wen)度。超過這個耐溫(wen)溫(wen)度,熱熔(rong)膠膜(mo)(mo)就(jiu)(jiu)(jiu)會失(shi)去粘接。所以,通(tong)常(chang)情況下,高(gao)溫(wen)熱熔(rong)膠膜(mo)(mo)的(de)耐溫(wen)性能(neng)也(ye)是比(bi)較(jiao)高(gao)的(de),相反(fan),低溫(wen)熱熔(rong)膠膜(mo)(mo)它的(de)耐高(gao)溫(wen)性能(neng)比(bi)較(jiao)差。
值得(de)一(yi)提的是(shi),熔(rong)化溫度(du)和實際的熱熔(rong)膠(jiao)膜使(shi)用溫度(du)是(shi)不一(yi)樣(yang)的。熱熔(rong)膠(jiao)膜的實際使(shi)用溫度(du)通常會比熔(rong)化溫度(du)高(gao)(gao)幾十度(du)。具體高(gao)(gao)多少(shao)還需(xu)要看熱熔(rong)膠(jiao)膜本身的熔(rong)指等其(qi)它特性,為的是(shi)使(shi)得(de)熱熔(rong)膠(jiao)膜在(zai)更短的時間內可以熔(rong)化。
通過上(shang)面(mian)的(de)說(shuo)明(ming),我們似(si)乎感覺到(dao)高(gao)(gao)溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)具(ju)有更(geng)(geng)好的(de)性能(neng)優(you)勢,能(neng)復(fu)合(he)(he)要(yao)(yao)求更(geng)(geng)高(gao)(gao)的(de)場合(he)(he),但實際上(shang)并不(bu)是這樣。選擇高(gao)(gao)溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)還(huan)是低溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)是由復(fu)合(he)(he)的(de)材料類型(xing)決定(ding)的(de)。俗話說(shuo),存在即合(he)(he)理(li)!高(gao)(gao)溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)、低溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)本(ben)就是為(wei)了滿足不(bu)同材料的(de)復(fu)合(he)(he)要(yao)(yao)求而比研發推出的(de),不(bu)能(neng)單(dan)獨討論是高(gao)(gao)溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)好,還(huan)是低溫(wen)(wen)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)更(geng)(geng)好。判定(ding)哪一(yi)種類型(xing)的(de)熱(re)熔(rong)(rong)(rong)膠(jiao)膜(mo)(mo)更(geng)(geng)好或(huo)者更(geng)(geng)合(he)(he)適,需要(yao)(yao)根據具(ju)體的(de)復(fu)合(he)(he)要(yao)(yao)求來測(ce)評、判斷(duan)。
在我們的材料粘接應用上,并不是所有場合都需要對熱熔膠膜提出耐高溫的要求,往往低溫的熱熔膠膜就可以符合性能(neng)(neng)需求(qiu)。并且,使(shi)用低溫熱熔膠(jiao)膜可以大大降低能(neng)(neng)耗(hao),在(zai)性能(neng)(neng)達到(dao)(dao)要求(qiu)的(de)基礎上,盡量做到(dao)(dao)節能(neng)(neng)環保的(de),這才是我們(men)所追(zhui)求(qiu)的(de)。