1. 生產PEX管(guan)的(de)主要原料(liao)是HDPE以及引發(fa)劑(ji)(ji)(ji)(ji)(ji)(ji)、交(jiao)聯劑(ji)(ji)(ji)(ji)(ji)(ji)、催化(hua)(hua)(hua)劑(ji)(ji)(ji)(ji)(ji)(ji)等助(zhu)劑(ji)(ji)(ji)(ji)(ji)(ji)，如有特(te)殊(shu)要求還可以添加其(qi)(qi)(qi)他改(gai)質劑(ji)(ji)(ji)(ji)(ji)(ji)。PEX管(guan)采用(yong)(yong)(yong)世界上先進的(de)一(yi)步法（MONSOIL法）技術制造，采用(yong)(yong)(yong)普(pu)通聚(ju)乙烯原料(liao)加入(ru)硅烷接枝料(liao)，在聚(ju)合物大分(fen)(fen)子鏈(lian)間(jian)形(xing)(xing)成(cheng)化(hua)(hua)(hua)學共價鍵以取代原有的(de)范德華力(li)，從(cong)而(er)形(xing)(xing)成(cheng)三維(wei)交(jiao)鏈(lian)網狀結構的(de)交(jiao)聯聚(ju)乙烯，其(qi)(qi)(qi)交(jiao)聯度可達60％～89％，使(shi)(shi)其(qi)(qi)(qi)具有優良的(de)理(li)化(hua)(hua)(hua)性(xing)能。PEX 管(guan)交(jiao)聯劑(ji)(ji)(ji)(ji)(ji)(ji)（添加劑(ji)(ji)(ji)(ji)(ji)(ji)）是對(dui)其(qi)(qi)(qi)原線(xian)型(xing)分(fen)(fen)子結構起(qi)裂解作(zuo)(zuo)用(yong)(yong)(yong)形(xing)(xing)成(cheng)接枝料(liao)，進而(er)形(xing)(xing)成(cheng)三維(wei)網狀結構。抗氧劑(ji)(ji)(ji)(ji)(ji)(ji)及色粒的(de)作(zuo)(zuo)用(yong)(yong)(yong)是提高PEX管(guan)的(de)耐(nai)腐性(xing)，防止(zhi)日(ri)光長(chang)(chang)期照射發(fa)生物性(xing)變化(hua)(hua)(hua)，能夠抵(di)御紫外線(xian)的(de)長(chang)(chang)期侵(qin)蝕，從(cong)而(er)延長(chang)(chang)其(qi)(qi)(qi)使(shi)(shi)用(yong)(yong)(yong)壽命。

  2. PEX管的性能和特點。

    ①. PEX管(guan)與(yu)鍍鋅鋼管(guan)的(de)性能比(bi)較見表(biao)4.3.14。

    ②. PEX管(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)、鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)性(xing)能(neng)(neng)(neng)異同(tong)點。從性(xing)能(neng)(neng)(neng)上看，三種管(guan)(guan)(guan)(guan)材除(chu)具(ju)(ju)有不(bu)銹(xiu)蝕、不(bu)結垢(gou)、不(bu)滋(zi)生(sheng)細菌和安裝(zhuang)簡便(bian)等(deng)共性(xing)外，還有一些區別(bie)：a.優(you)良的(de)(de)耐溫(wen)性(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)使(shi)用(yong)(yong)溫(wen)度(du)(du)為-70～110℃，UPVC管(guan)(guan)(guan)(guan)使(shi)用(yong)(yong)溫(wen)度(du)(du)為5～45℃，鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)使(shi)用(yong)(yong)溫(wen)度(du)(du)為-40～85℃。b．防振(zhen)性(xing)能(neng)(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)由(you)于采用(yong)(yong)膠水(shui)(shui)粘(zhan)接，防振(zhen)性(xing)能(neng)(neng)(neng)略(lve)遜色于鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)。c．使(shi)用(yong)(yong)壽命(ming)。UPVC管(guan)(guan)(guan)(guan)和鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)使(shi)用(yong)(yong)壽命(ming)約20～30年，PEX管(guan)(guan)(guan)(guan)約50年。d．抗(kang)化學(xue)腐蝕性(xing)能(neng)(neng)(neng)。由(you)于PEX管(guan)(guan)(guan)(guan)其(qi)分子結構，即(ji)(ji)使(shi)處(chu)于高(gao)溫(wen)下也(ye)能(neng)(neng)(neng)輸送(song)多種化學(xue)物(wu)質(zhi)(zhi)，而不(bu)被腐蝕。e．良好的(de)(de)記憶性(xing)能(neng)(neng)(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)被加(jia)熱(re)到(dao)適(shi)當(dang)溫(wen)度(du)(du)（小于180℃）時(shi)會(hui)(hui)(hui)變成(cheng)透明狀(zhuang)，再冷卻時(shi)會(hui)(hui)(hui)恢復(fu)到(dao)原來的(de)(de)形狀(zhuang)，即(ji)(ji)在使(shi)用(yong)(yong)過程中任何錯(cuo)誤(wu)的(de)(de)彎曲都可以(yi)通過熱(re)風槍加(jia)以(yi)矯正(zheng)，使(shi)用(yong)(yong)起來更(geng)加(jia)自如。f.不(bu)結垢(gou)。水(shui)(shui)中碳酸氫鈣及鎂離子的(de)(de)存在易(yi)形成(cheng)沉淀(dian)物(wu)，慢慢使(shi)管(guan)(guan)(guan)(guan)道(dao)堵(du)塞，而PEX管(guan)(guan)(guan)(guan)具(ju)(ju)有較低(di)的(de)(de)表面張力以(yi)致使(shi)高(gao)表面張力的(de)(de)水(shui)(shui)不(bu)會(hui)(hui)(hui)被浸潤管(guan)(guan)(guan)(guan)壁，從而防止管(guan)(guan)(guan)(guan)內水(shui)(shui)垢(gou)的(de)(de)形成(cheng)。g.環保(bao)性(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)是(shi)無污染環境(jing)的(de)(de)綠(lv)色管(guan)(guan)(guan)(guan)材，不(bu)含任何毒(du)素，也(ye)不(bu)釋放有害物(wu)質(zhi)(zhi)，焚燒(shao)后只產生(sheng)水(shui)(shui)和二氧化碳。而UPVC管(guan)(guan)(guan)(guan)在生(sheng)產過程中加(jia)入(ru)重金(jin)屬添(tian)加(jia)劑，同(tong)時(shi)本身殘存的(de)(de)單(dan)體氯乙(yi)烯在使(shi)用(yong)(yong)時(shi)一起進入(ru)輸送(song)的(de)(de)介質(zhi)(zhi)中，易(yi)造(zao)成(cheng)介質(zhi)(zhi)污染；鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)由(you)于中間為鋁(lv)(lv)層，因(yin)鋁(lv)(lv)和塑(su)(su)料的(de)(de)膨(peng)脹系數(shu)不(bu)一樣，易(yi)發生(sheng)龜裂現象(xiang)，屬不(bu)可降解物(wu)質(zhi)(zhi)，其(qi)垃圾易(yi)造(zao)成(cheng)環境(jing)污染。

  3. PEX管(guan)的(de)領(ling)域。

    ①. 室內(nei)給水管(guan)(guan)、熱(re)水管(guan)(guan)、純(chun)凈水輸送管(guan)(guan)。②. 食(shi)(shi)品(pin)中液體食(shi)(shi)品(pin)輸送管(guan)(guan)道。③. 水暖供熱(re)系(xi)(xi)統(tong)、中央空調管(guan)(guan)道系(xi)(xi)統(tong)、地面輻(fu)射采(cai)暖系(xi)(xi)統(tong)、太陽能(neng)熱(re)水器系(xi)(xi)統(tong)等。④. 電(dian)信(xin)、電(dian)氣用(yong)配管(guan)(guan)。⑤. 電(dian)鍍、石油、化工廠輸送管(guan)(guan)道系(xi)(xi)統(tong)。

4. 交聯聚乙烯PEX管(guan)的主要標準見表4.3.15。