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聚烯烴彈性體POE的性能及使用范圍

POE是由辛烯和(he)聚(ju)烯烴樹(shu)脂(zhi)組成(cheng)的(de),連(lian)續(xu)(xu)相(xiang)(xiang)與分散(san)相(xiang)(xiang)呈(cheng)現(xian)(xian)兩(liang)相(xiang)(xiang)分離的(de)聚(ju)合物摻(chan)混(hun)物,通過掃描(miao)電子(zi)顯微鏡(jing)或(huo)相(xiang)(xiang)差顯微鏡(jing)的(de)圖像表明,可以形成(cheng)以橡(xiang)(xiang)膠(jiao)為(wei)連(lian)續(xu)(xu)相(xiang)(xiang)、樹(shu)脂(zhi)為(wei)分散(san)相(xiang)(xiang)或(huo)以橡(xiang)(xiang)膠(jiao)為(wei)分散(san)相(xiang)(xiang)、樹(shu)脂(zhi)為(wei)連(lian)續(xu)(xu)相(xiang)(xiang),或(huo)者兩(liang)者都呈(cheng)現(xian)(xian)連(lian)續(xu)(xu)相(xiang)(xiang)時(shi)的(de)互(hu)穿網絡結構(gou)。隨(sui)著相(xiang)(xiang)態的(de)變化,共(gong)混(hun)物的(de)性(xing)能也(ye)隨(sui)之而變。若(ruo)橡(xiang)(xiang)膠(jiao)為(wei)連(lian)續(xu)(xu)相(xiang)(xiang)時(shi),呈(cheng)現(xian)(xian)近似硫化膠(jiao)的(de)性(xing)能;樹(shu)脂(zhi)為(wei)連(lian)續(xu)(xu)相(xiang)(xiang)時(shi),則性(xing)能近于(yu)塑料。


加(jia)(jia)工(gong)與配(pei)(pei)合:POE不需(xu)混(hun)煉(lian)和硫化。可(ke)(ke)采用(yong)通常熱塑(su)性塑(su)料(liao)(liao)加(jia)(jia)工(gong)設備進行加(jia)(jia)工(gong)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)。成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)加(jia)(jia)工(gong)溫度和加(jia)(jia)工(gong)壓(ya)力(li)一般應略高(gao)一些(xie)(xie),可(ke)(ke)在極高(gao)的(de)加(jia)(jia)工(gong)速度下加(jia)(jia)工(gong)。可(ke)(ke)以注(zhu)射成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、擠出成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing),也可(ke)(ke)用(yong)壓(ya)延(yan)機加(jia)(jia)工(gong)成(cheng)(cheng)(cheng)(cheng)板材或薄膜,并(bing)可(ke)(ke)吹塑(su)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing),利用(yong)熱成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)可(ke)(ke)制(zhi)(zhi)造(zao)形狀復雜的(de)制(zhi)(zhi)品(pin)。可(ke)(ke)根據需(xu)要添加(jia)(jia)各(ge)種顏(yan)料(liao)(liao)制(zhi)(zhi)成(cheng)(cheng)(cheng)(cheng)不同(tong)的(de)顏(yan)色。有(you)些(xie)(xie)生產廠家依制(zhi)(zhi)品(pin)的(de)使(shi)用(yong)要求,提供如耐(nai)油型(xing)(xing)(xing)、阻燃型(xing)(xing)(xing)、電(dian)穩定型(xing)(xing)(xing)以及可(ke)(ke)靜電(dian)涂料(liao)(liao)型(xing)(xing)(xing)等(deng)各(ge)種品(pin)級(ji)的(de)特殊配(pei)(pei)合料(liao)(liao)。有(you)時為改善加(jia)(jia)工(gong)性能和某些(xie)(xie)制(zhi)(zhi)品(pin)的(de)使(shi)用(yong)性能或降低成(cheng)(cheng)(cheng)(cheng)本時,也可(ke)(ke)以加(jia)(jia)入某些(xie)(xie)配(pei)(pei)合劑(ji),如抗(kang)氧劑(ji)、軟化劑(ji)和填充劑(ji)、著(zhu)色劑(ji)等(deng)。邊角(jiao)料(liao)(liao)和廢料(liao)(liao)可(ke)(ke)回收重復加(jia)(jia)工(gong)使(shi)用(yong)。但一般摻入比(bi)例不超過30%,這(zhe)樣(yang)對性能無影響(xiang)POE對共混(hun)體(ti)系的(de)影響(xiang)


POE是采用茂金屬催化劑的(de)乙烯(xi)和辛(xin)烯(xi)實現原位(wei)聚合的(de)熱塑性(xing)(xing)(xing)彈性(xing)(xing)(xing)體,其特點(dian)是:(1)辛(xin)烯(xi)的(de)柔(rou)軟(ruan)鏈卷曲結構和結晶的(de)乙烯(xi)鏈作(zuo)為(wei)物理交聯點(dian),使它既有(you)(you)(you)優異的(de)韌(ren)性(xing)(xing)(xing)又有(you)(you)(you)良(liang)好(hao)(hao)的(de)加工性(xing)(xing)(xing)。(2)POE分子結構中(zhong)沒有(you)(you)(you)不飽(bao)和雙鍵,具有(you)(you)(you)優良(liang)的(de)耐(nai)老化性(xing)(xing)(xing)能(neng)。(3)POE分子量分布窄,具有(you)(you)(you)較(jiao)好(hao)(hao)的(de)流動(dong)性(xing)(xing)(xing),與聚烯(xi)烴相容(rong)性(xing)(xing)(xing)好(hao)(hao)。(4)良(liang)好(hao)(hao)的(de)流動(dong)性(xing)(xing)(xing)可改善填(tian)料(liao)的(de)分散效果,同(tong)時也可提(ti)高制品(pin)的(de)熔接(jie)痕強度。


隨(sui)著POE含(han)量(liang)(liang)的(de)(de)增(zeng)加(jia),體(ti)(ti)系的(de)(de)沖(chong)擊(ji)(ji)強(qiang)度(du)和斷裂伸(shen)長(chang)率(lv)有(you)很大的(de)(de)提(ti)高(gao)。可見,POE對PP有(you)優良的(de)(de)增(zeng)韌(ren)作用,與PP、活性(xing)碳酸鈣有(you)較(jiao)好(hao)的(de)(de)相容(rong)性(xing)。這是因為POE的(de)(de)分(fen)(fen)子(zi)量(liang)(liang)分(fen)(fen)布窄,分(fen)(fen)子(zi)結(jie)構(gou)(gou)中側辛基(ji)長(chang)于側乙基(ji),在(zai)(zai)分(fen)(fen)子(zi)結(jie)構(gou)(gou)中可形(xing)成(cheng)聯結(jie)點,在(zai)(zai)各成(cheng)分(fen)(fen)之(zhi)間起(qi)到聯結(jie)、緩(huan)(huan)沖(chong)作用,使體(ti)(ti)系在(zai)(zai)受到沖(chong)擊(ji)(ji)時起(qi)分(fen)(fen)散、緩(huan)(huan)沖(chong)沖(chong)擊(ji)(ji)能的(de)(de)作用,減少銀紋因受力發展成(cheng)裂紋的(de)(de)機會,從而提(ti)高(gao)了體(ti)(ti)系的(de)(de)沖(chong)擊(ji)(ji)強(qiang)度(du)。當體(ti)(ti)系受到張(zhang)力時,由于這些聯結(jie)點所形(xing)成(cheng)的(de)(de)網絡(luo)狀結(jie)構(gou)(gou)可以(yi)(yi)發生較(jiao)大的(de)(de)形(xing)變,所以(yi)(yi),體(ti)(ti)系的(de)(de)斷裂伸(shen)長(chang)率(lv)有(you)顯著的(de)(de)增(zeng)加(jia),當POE的(de)(de)含(han)量(liang)(liang)增(zeng)加(jia)時,體(ti)(ti)系的(de)(de)拉(la)伸(shen)強(qiang)度(du)、彎曲(qu)強(qiang)度(du)和彎曲(qu)模量(liang)(liang)均(jun)有(you)所下(xia)降,這是由POE本身的(de)(de)性(xing)能決定的(de)(de),故POE的(de)(de)含(han)量(liang)(liang)應控制在(zai)(zai)20%以(yi)(yi)下(xia)。


POE的(de)(de)含量與熔(rong)融(rong)指(zhi)(zhi)數的(de)(de)關系,加(jia)入POE后,體(ti)(ti)系的(de)(de)熔(rong)融(rong)指(zhi)(zhi)數增加(jia)。POE本身的(de)(de)流(liu)(liu)動(dong)性較(jiao)好,它的(de)(de)加(jia)入,同時也改善了整個體(ti)(ti)系的(de)(de)流(liu)(liu)動(dong)性,當POE含量超過(guo)15份以后,體(ti)(ti)系的(de)(de)熔(rong)融(rong)指(zhi)(zhi)數基本沒有(you)變化(hua),若要繼續提高體(ti)(ti)系的(de)(de)流(liu)(liu)動(dong)性,則(ze)不能(neng)完全(quan)依賴于POE。


基本特性(xing)(xing)(xing)(xing)(xing)(xing):(1)POE具有熱塑性(xing)(xing)(xing)(xing)(xing)(xing)彈性(xing)(xing)(xing)(xing)(xing)(xing)體的一般物性(xing)(xing)(xing)(xing)(xing)(xing),如(ru)成型(xing)性(xing)(xing)(xing)(xing)(xing)(xing)、廢料(liao)再利用(yong)(yong)(yong)(yong)和(he)硫化膠性(xing)(xing)(xing)(xing)(xing)(xing)能等(deng)。(2)價(jia)格低(di),并且相對(dui)密度小,因(yin)而體積價(jia)格低(di)廉(lian)。(3)耐(nai)(nai)(nai)(nai)熱性(xing)(xing)(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)(nai)寒性(xing)(xing)(xing)(xing)(xing)(xing)優異,使用(yong)(yong)(yong)(yong)范圍(wei)寬廣。(4)耐(nai)(nai)(nai)(nai)候性(xing)(xing)(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)(nai)老化性(xing)(xing)(xing)(xing)(xing)(xing)良好。(5)耐(nai)(nai)(nai)(nai)油(you)性(xing)(xing)(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)(nai)壓縮永久變(bian)形和(he)耐(nai)(nai)(nai)(nai)磨耗等(deng)不(bu)太好。應用(yong)(yong)(yong)(yong)范圍(wei):主(zhu)要(yao)用(yong)(yong)(yong)(yong)于改性(xing)(xing)(xing)(xing)(xing)(xing)增韌(ren)PP、PE和(he)PA在汽(qi)車工(gong)業方(fang)面制作保險杠、擋泥板、方(fang)向盤、墊板等(deng)等(deng)。電線電纜工(gong)業上(shang)耐(nai)(nai)(nai)(nai)熱性(xing)(xing)(xing)(xing)(xing)(xing)和(he)耐(nai)(nai)(nai)(nai)環境性(xing)(xing)(xing)(xing)(xing)(xing)要(yao)求高(gao)的絕緣(yuan)層和(he)護套。也用(yong)(yong)(yong)(yong)于工(gong)業用(yong)(yong)(yong)(yong)制品如(ru)膠管(guan)、輸送帶、膠布(bu)和(he)模壓制品。醫(yi)療(liao)器(qi)械(xie)以(yi)及(ji)家用(yong)(yong)(yong)(yong)電器(qi)、文(wen)體用(yong)(yong)(yong)(yong)品、玩具等(deng),以(yi)及(ji)包裝薄(bo)膜(mo)等(deng)等(deng)。

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