1. 生產PEX管(guan)的(de)主要原(yuan)(yuan)料是HDPE以(yi)及引發劑(ji)、交(jiao)聯劑(ji)、催化劑(ji)等助劑(ji)，如(ru)有(you)特殊(shu)要求還可以(yi)添(tian)(tian)加(jia)其他改質劑(ji)。PEX管(guan)采用(yong)(yong)(yong)世(shi)界上(shang)先(xian)進的(de)一步法（MONSOIL法）技術制造，采用(yong)(yong)(yong)普通聚乙烯原(yuan)(yuan)料加(jia)入硅烷接枝料，在聚合物大(da)分(fen)子鏈(lian)間(jian)形(xing)(xing)成化學共價鍵以(yi)取代原(yuan)(yuan)有(you)的(de)范德華力(li)，從而(er)(er)形(xing)(xing)成三維交(jiao)鏈(lian)網(wang)狀結構的(de)交(jiao)聯聚乙烯，其交(jiao)聯度可達60％～89％，使(shi)(shi)其具有(you)優(you)良的(de)理化性(xing)能。PEX 管(guan)交(jiao)聯劑(ji)（添(tian)(tian)加(jia)劑(ji)）是對其原(yuan)(yuan)線(xian)型分(fen)子結構起裂解作用(yong)(yong)(yong)形(xing)(xing)成接枝料，進而(er)(er)形(xing)(xing)成三維網(wang)狀結構。抗氧劑(ji)及色(se)粒的(de)作用(yong)(yong)(yong)是提高PEX管(guan)的(de)耐腐(fu)性(xing)，防(fang)止(zhi)日(ri)光長(chang)期照射發生物性(xing)變化，能夠抵御紫外線(xian)的(de)長(chang)期侵蝕，從而(er)(er)延長(chang)其使(shi)(shi)用(yong)(yong)(yong)壽命。

  2. PEX管(guan)的性能和特點。

    ①. PEX管與鍍鋅鋼管的性能(neng)比較見表4.3.14。

    ②. PEX管(guan)(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)(guan)、鋁(lv)(lv)塑復(fu)(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)性(xing)(xing)(xing)(xing)能(neng)異同點(dian)。從性(xing)(xing)(xing)(xing)能(neng)上(shang)看，三種(zhong)管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)除具有不(bu)(bu)(bu)(bu)銹蝕、不(bu)(bu)(bu)(bu)結垢(gou)、不(bu)(bu)(bu)(bu)滋生細菌和安裝(zhuang)簡(jian)便等共性(xing)(xing)(xing)(xing)外，還有一(yi)(yi)些區別：a.優良(liang)的(de)耐溫(wen)(wen)性(xing)(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)為(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)為(wei)5～45℃，鋁(lv)(lv)塑復(fu)(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)為(wei)-40～85℃。b．防(fang)振性(xing)(xing)(xing)(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)由(you)于(yu)采用(yong)(yong)(yong)膠水(shui)(shui)粘接，防(fang)振性(xing)(xing)(xing)(xing)能(neng)略遜色于(yu)鋁(lv)(lv)塑復(fu)(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)用(yong)(yong)(yong)壽(shou)命(ming)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)和鋁(lv)(lv)塑復(fu)(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)壽(shou)命(ming)約20～30年，PEX管(guan)(guan)(guan)(guan)(guan)(guan)約50年。d．抗化學腐(fu)蝕性(xing)(xing)(xing)(xing)能(neng)。由(you)于(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)其(qi)分子(zi)結構，即(ji)使(shi)(shi)處于(yu)高溫(wen)(wen)下(xia)也能(neng)輸送(song)多種(zhong)化學物(wu)(wu)質(zhi)，而(er)不(bu)(bu)(bu)(bu)被腐(fu)蝕。e．良(liang)好的(de)記憶(yi)性(xing)(xing)(xing)(xing)能(neng)。當PEX管(guan)(guan)(guan)(guan)(guan)(guan)被加熱(re)到適當溫(wen)(wen)度(du)（小于(yu)180℃）時(shi)會變成(cheng)透明狀(zhuang)，再冷卻(que)時(shi)會恢復(fu)(fu)到原(yuan)來的(de)形(xing)狀(zhuang)，即(ji)在(zai)使(shi)(shi)用(yong)(yong)(yong)過程(cheng)中(zhong)任何(he)錯(cuo)誤的(de)彎曲都(dou)可以(yi)通(tong)過熱(re)風槍加以(yi)矯(jiao)正，使(shi)(shi)用(yong)(yong)(yong)起來更加自如。f.不(bu)(bu)(bu)(bu)結垢(gou)。水(shui)(shui)中(zhong)碳酸(suan)氫鈣及鎂離(li)子(zi)的(de)存(cun)在(zai)易(yi)形(xing)成(cheng)沉(chen)淀物(wu)(wu)，慢慢使(shi)(shi)管(guan)(guan)(guan)(guan)(guan)(guan)道堵塞，而(er)PEX管(guan)(guan)(guan)(guan)(guan)(guan)具有較低的(de)表面張(zhang)(zhang)力(li)以(yi)致使(shi)(shi)高表面張(zhang)(zhang)力(li)的(de)水(shui)(shui)不(bu)(bu)(bu)(bu)會被浸潤(run)管(guan)(guan)(guan)(guan)(guan)(guan)壁，從而(er)防(fang)止管(guan)(guan)(guan)(guan)(guan)(guan)內水(shui)(shui)垢(gou)的(de)形(xing)成(cheng)。g.環保性(xing)(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)是無(wu)污(wu)(wu)染(ran)環境(jing)的(de)綠色管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)，不(bu)(bu)(bu)(bu)含任何(he)毒素，也不(bu)(bu)(bu)(bu)釋放有害物(wu)(wu)質(zhi)，焚燒后只產生水(shui)(shui)和二氧化碳。而(er)UPVC管(guan)(guan)(guan)(guan)(guan)(guan)在(zai)生產過程(cheng)中(zhong)加入重金屬添加劑，同時(shi)本身殘存(cun)的(de)單體氯(lv)乙烯在(zai)使(shi)(shi)用(yong)(yong)(yong)時(shi)一(yi)(yi)起進(jin)入輸送(song)的(de)介質(zhi)中(zhong)，易(yi)造成(cheng)介質(zhi)污(wu)(wu)染(ran)；鋁(lv)(lv)塑復(fu)(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)由(you)于(yu)中(zhong)間為(wei)鋁(lv)(lv)層，因鋁(lv)(lv)和塑料的(de)膨脹系數不(bu)(bu)(bu)(bu)一(yi)(yi)樣(yang)，易(yi)發(fa)生龜裂現象，屬不(bu)(bu)(bu)(bu)可降解(jie)物(wu)(wu)質(zhi)，其(qi)垃圾易(yi)造成(cheng)環境(jing)污(wu)(wu)染(ran)。

  3. PEX管的領域。

    ①. 室內給水(shui)管(guan)(guan)、熱水(shui)管(guan)(guan)、純凈(jing)水(shui)輸送(song)管(guan)(guan)。②. 食品(pin)中(zhong)液體食品(pin)輸送(song)管(guan)(guan)道(dao)。③. 水(shui)暖(nuan)供熱系(xi)(xi)(xi)統(tong)、中(zhong)央空調(diao)管(guan)(guan)道(dao)系(xi)(xi)(xi)統(tong)、地面(mian)輻射(she)采暖(nuan)系(xi)(xi)(xi)統(tong)、太陽能熱水(shui)器系(xi)(xi)(xi)統(tong)等。④. 電(dian)信、電(dian)氣用(yong)配(pei)管(guan)(guan)。⑤. 電(dian)鍍、石油、化工(gong)廠(chang)輸送(song)管(guan)(guan)道(dao)系(xi)(xi)(xi)統(tong)。

4. 交聯聚(ju)乙(yi)烯PEX管的主要(yao)標(biao)準見表4.3.15。