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熔融指數對塑料性能有什么影響?
發布日期:2021-11-05

熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)對塑(su)料性(xing)能有(you)什么影響?熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)常用(yong)MI表示,現在(zai)(zai)國(guo)際上統一(yi)稱作熔(rong)(rong)體流(liu)(liu)動速(su)率,用(yong)MFR表示。它(ta)通(tong)常作為(wei)熱塑(su)性(xing)樹(shu)脂(zhi)(zhi)質量(liang)(liang)控制和熱塑(su)性(xing)塑(su)料成型(xing)工藝(yi)條件的(de)(de)參(can)(can)數(shu)(shu)。它(ta)是熱塑(su)性(xing)樹(shu)脂(zhi)(zhi)和塑(su)料在(zai)(zai)規定(ding)(ding)溫度(du)和恒定(ding)(ding)負荷(he)下,熔(rong)(rong)體在(zai)(zai)一(yi)定(ding)(ding)時間內流(liu)(liu)過標準毛(mao)細管的(de)(de)重量(liang)(liang)值,以g/10min來表示。熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)是用(yong)以區別各(ge)種熱塑(su)性(xing)材(cai)料在(zai)(zai)熔(rong)(rong)融(rong)(rong)(rong)狀態時流(liu)(liu)動性(xing)的(de)(de)參(can)(can)數(shu)(shu)。對同一(yi)種樹(shu)脂(zhi)(zhi),可以用(yong)熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)比(bi)較其(qi)(qi)分(fen)子量(liang)(liang)的(de)(de)大(da)小(xiao),以作為(wei)生產質量(liang)(liang)控制。一(yi)般(ban)來說(shuo),對化學結構一(yi)定(ding)(ding)的(de)(de)樹(shu)脂(zhi)(zhi),其(qi)(qi)熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)越小(xiao),分(fen)子量(liang)(liang)就(jiu)越大(da),則其(qi)(qi)斷裂強(qiang)度(du)、硬度(du)、韌性(xing)、耐(nai)老(lao)化穩定(ding)(ding)性(xing)等性(xing)能都有(you)所(suo)提(ti)高。而熔(rong)(rong)融(rong)(rong)(rong)指數(shu)(shu)大(da),分(fen)子量(liang)(liang)就(jiu)小(xiao),成型(xing)時的(de)(de)流(liu)(liu)動性(xing)就(jiu)相應好一(yi)些(xie)。

1、熔指(zhi)的(de)高低影響(xiang)塑(su)料(liao)的(de)性(xing)(xing)(xing)(xing)(xing)能(neng)。塑(su)膠原料(liao)一般熔融指(zhi)數高,則流(liu)動性(xing)(xing)(xing)(xing)(xing)大,成型加工(gong)方便,挺(ting)度(du)與(yu)阻隔(ge)特性(xing)(xing)(xing)(xing)(xing)好;抗沖(chong)擊(ji)特性(xing)(xing)(xing)(xing)(xing)、抗環境應力開裂特性(xing)(xing)(xing)(xing)(xing)、戶外特性(xing)(xing)(xing)(xing)(xing)、抗化(hua)學介質特性(xing)(xing)(xing)(xing)(xing)差;熔融指(zhi)數越小,則其斷裂強度(du)、硬(ying)度(du)、韌(ren)性(xing)(xing)(xing)(xing)(xing)、耐老(lao)化(hua)穩定性(xing)(xing)(xing)(xing)(xing)等性(xing)(xing)(xing)(xing)(xing)能(neng)都(dou)有所提高。

2、聚酯的紡絲(si)和注塑成型等加工都是在熔融狀態下進行(xing)的,熔體的黏度是其流變性能(neng)中最重要(yao)的參數之一,同時也是確(que)保產(chan)品質量的關鍵。

3、熔融指數是一個表征原料在螺(luo)桿內(nei)流動(dong)速率的參數,在給定剪(jian)切(qie)力的情況(kuang)下測定聚合物的流動(dong)度,與(yu)剪(jian)切(qie)力和(he)溫(wen)度有關(guan)。

4、熔融指(zhi)數(shu)高的材料在擠出機里與(yu)螺桿的摩擦系數(shu)相(xiang)對較小,因而產出量也相(xiang)對較少。高熔指(zhi)的料一般情況下雜質較多,對機頭的壓力大,容易造(zao)成(cheng)網(wang)堵塞。

5、測(ce)試材料(liao)的流(liu)動(dong)性能能否達到生(sheng)(sheng)產(chan)的要(yao)求,如果測(ce)試結果不(bu)合格則不(bu)能作為生(sheng)(sheng)產(chan)原料(liao)來使用。