陶氏低(di)密度聚乙烯 PG 7004 (Injection Molding) 陶氏塑料 LDPE  7004 Polyethylene Resin from Dow has been designed to exhibit good processability, balanced physical properties,

LDPE可以采用(yong)(yong)注(zhu)塑、擠塑、吹(chui)塑等(deng)(deng)加(jia)工(gong)(gong)方法。主要用(yong)(yong)作(zuo)(zuo)農膜、工(gong)(gong)業用(yong)(yong)包(bao)(bao)裝(zhuang)膜、藥品與食(shi)品包(bao)(bao)裝(zhuang)薄(bo)膜、機械零件、日(ri)(ri)用(yong)(yong)品、建筑材料、電線、電纜(lan)絕緣、涂層和(he)合成紙等(deng)(deng)。 低(di)密度聚乙(yi)烯分(fen)子鏈上有長(chang)短支(zhi)鏈。結(jie)晶度較(jiao)(jiao)低(di)，分(fen)子量(liang)一般5～50萬(wan)，它是(shi)一種乳白色呈(cheng)半透明的(de)(de)蠟(la)狀固體樹脂，無毒。軟化(hua)(hua)點(dian)較(jiao)(jiao)低(di)，超過軟化(hua)(hua)點(dian)即熔融，其熱(re)熔接性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、成型加(jia)工(gong)(gong)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)能很(hen)好(hao)，柔軟性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)良(liang)好(hao)，抗(kang)沖擊韌性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、耐低(di)溫性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)很(hen)好(hao)，可在-60℃～-80℃下工(gong)(gong)作(zuo)(zuo)，電絕緣性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)優秀(xiu)（尤(you)其是(shi)高(gao)頻絕緣性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)），LDPE的(de)(de)機械強度較(jiao)(jiao)差(cha)，耐熱(re)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)不高(gao)，抗(kang)環境應力開裂(lie)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、粘附性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、粘合性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、印刷(shua)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)差(cha)，需經表面處(chu)理(li)，如化(hua)(hua)學侵(qin)蝕、電暈等(deng)(deng)處(chu)理(li)后方可改進其粘合性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、印刷(shua)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)。吸水(shui)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)很(hen)低(di)，幾乎不吸水(shui)，化(hua)(hua)學穩定(ding)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)優秀(xiu)，如對酸、堿(jian)、鹽(yan)、有機溶劑(ji)都較(jiao)(jiao)穩定(ding)。對CO2、有機性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)臭氣滲透性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)大，但對水(shui)蒸汽、空(kong)氣的(de)(de)滲透性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)差(cha)。易(yi)燃(ran)燒(shao)，燃(ran)燒(shao)時有似(si)石蠟(la)昧；在日(ri)(ri)光和(he)熱(re)作(zuo)(zuo)用(yong)(yong)下容易(yi)老化(hua)(hua)降解而(er)變色，由白轉黃轉褐色，較(jiao)(jiao)終呈(cheng)黑(hei)色，且性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)能下降或龜裂(lie)，若(ruo)加(jia)入一定(ding)量(liang)的(de)(de)抗(kang)氧劑(ji)、紫外線吸收劑(ji)等(deng)(deng)可改善性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)能、在化(hua)(hua)學交聯(lian)劑(ji)或高(gao)能輻照下交聯(lian)，可提高(gao)軟化(hua)(hua)點(dian)、耐溫性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)、剛(gang)度、耐溶劑(ji)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)等(deng)(deng)。

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