1. 生產PEX管(guan)的(de)(de)主(zhu)要原料是HDPE以(yi)及引發(fa)劑(ji)、交(jiao)聯(lian)劑(ji)、催化劑(ji)等助劑(ji)，如(ru)有(you)特殊要求還可以(yi)添加其(qi)他改(gai)質劑(ji)。PEX管(guan)采(cai)用(yong)(yong)世界上先進的(de)(de)一步法(fa)（MONSOIL法(fa)）技術制造，采(cai)用(yong)(yong)普(pu)通聚(ju)(ju)乙(yi)烯(xi)原料加入硅烷接枝(zhi)料，在聚(ju)(ju)合物大分子(zi)鏈(lian)(lian)間形(xing)成(cheng)(cheng)(cheng)化學共(gong)價(jia)鍵以(yi)取(qu)代原有(you)的(de)(de)范德華力，從而形(xing)成(cheng)(cheng)(cheng)三維交(jiao)鏈(lian)(lian)網狀結(jie)構(gou)的(de)(de)交(jiao)聯(lian)聚(ju)(ju)乙(yi)烯(xi)，其(qi)交(jiao)聯(lian)度可達(da)60％～89％，使其(qi)具(ju)有(you)優良的(de)(de)理(li)化性能。PEX 管(guan)交(jiao)聯(lian)劑(ji)（添加劑(ji)）是對其(qi)原線型(xing)分子(zi)結(jie)構(gou)起裂解作用(yong)(yong)形(xing)成(cheng)(cheng)(cheng)接枝(zhi)料，進而形(xing)成(cheng)(cheng)(cheng)三維網狀結(jie)構(gou)。抗氧劑(ji)及色粒(li)的(de)(de)作用(yong)(yong)是提(ti)高PEX管(guan)的(de)(de)耐腐性，防止日(ri)光長期照(zhao)射發(fa)生物性變(bian)化，能夠抵御紫(zi)外線的(de)(de)長期侵(qin)蝕，從而延長其(qi)使用(yong)(yong)壽(shou)命(ming)。

  2. PEX管的性能(neng)和特點。

    ①. PEX管與鍍鋅鋼管的性能比較(jiao)見(jian)表(biao)4.3.14。

    ②. PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、鋁(lv)(lv)塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)異同點。從性(xing)能(neng)上看，三種(zhong)(zhong)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)材除具有不(bu)銹蝕、不(bu)結(jie)垢(gou)、不(bu)滋生(sheng)(sheng)細(xi)菌和安裝簡(jian)便等(deng)共性(xing)外，還有一(yi)(yi)些區別：a.優(you)良的(de)(de)耐溫性(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)(yong)溫度(du)為(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)(yong)溫度(du)為(wei)5～45℃，鋁(lv)(lv)塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)(yong)溫度(du)為(wei)-40～85℃。b．防(fang)振性(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)(yu)采用(yong)(yong)(yong)(yong)膠水(shui)(shui)粘接，防(fang)振性(xing)能(neng)略遜色于(yu)(yu)鋁(lv)(lv)塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)用(yong)(yong)(yong)(yong)壽(shou)命。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和鋁(lv)(lv)塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)(yong)(yong)壽(shou)命約(yue)20～30年(nian)，PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)約(yue)50年(nian)。d．抗化(hua)(hua)學(xue)腐蝕性(xing)能(neng)。由于(yu)(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)其分子結(jie)構(gou)，即使(shi)(shi)處于(yu)(yu)高(gao)(gao)溫下也能(neng)輸送多(duo)種(zhong)(zhong)化(hua)(hua)學(xue)物質，而(er)不(bu)被(bei)腐蝕。e．良好的(de)(de)記憶(yi)性(xing)能(neng)。當PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)被(bei)加(jia)熱到適當溫度(du)（小于(yu)(yu)180℃）時會變成(cheng)(cheng)透明(ming)狀(zhuang)，再冷卻時會恢復到原來(lai)的(de)(de)形(xing)狀(zhuang)，即在使(shi)(shi)用(yong)(yong)(yong)(yong)過程中(zhong)任何錯誤的(de)(de)彎曲都可以(yi)通過熱風槍(qiang)加(jia)以(yi)矯正，使(shi)(shi)用(yong)(yong)(yong)(yong)起來(lai)更加(jia)自如。f.不(bu)結(jie)垢(gou)。水(shui)(shui)中(zhong)碳(tan)酸氫鈣及鎂離子的(de)(de)存在易(yi)形(xing)成(cheng)(cheng)沉淀物，慢慢使(shi)(shi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道堵塞，而(er)PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)具有較低的(de)(de)表面(mian)(mian)張(zhang)力以(yi)致使(shi)(shi)高(gao)(gao)表面(mian)(mian)張(zhang)力的(de)(de)水(shui)(shui)不(bu)會被(bei)浸潤管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)，從而(er)防(fang)止(zhi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)內(nei)水(shui)(shui)垢(gou)的(de)(de)形(xing)成(cheng)(cheng)。g.環(huan)保性(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)是無(wu)污染環(huan)境(jing)的(de)(de)綠(lv)色管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)材，不(bu)含任何毒素(su)，也不(bu)釋放有害物質，焚燒后(hou)只產(chan)生(sheng)(sheng)水(shui)(shui)和二氧化(hua)(hua)碳(tan)。而(er)UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)在生(sheng)(sheng)產(chan)過程中(zhong)加(jia)入(ru)重金屬添加(jia)劑，同時本(ben)身殘存的(de)(de)單(dan)體(ti)氯乙烯在使(shi)(shi)用(yong)(yong)(yong)(yong)時一(yi)(yi)起進入(ru)輸送的(de)(de)介質中(zhong)，易(yi)造(zao)(zao)成(cheng)(cheng)介質污染；鋁(lv)(lv)塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)(yu)中(zhong)間為(wei)鋁(lv)(lv)層，因鋁(lv)(lv)和塑(su)料(liao)的(de)(de)膨脹系數不(bu)一(yi)(yi)樣，易(yi)發生(sheng)(sheng)龜裂(lie)現象，屬不(bu)可降解(jie)物質，其垃圾易(yi)造(zao)(zao)成(cheng)(cheng)環(huan)境(jing)污染。

  3. PEX管的領域。

    ①. 室內給水管(guan)、熱水管(guan)、純凈(jing)水輸送管(guan)。②. 食(shi)品中(zhong)(zhong)液體食(shi)品輸送管(guan)道。③. 水暖(nuan)供熱系統(tong)(tong)、中(zhong)(zhong)央(yang)空(kong)調管(guan)道系統(tong)(tong)、地面輻射(she)采(cai)暖(nuan)系統(tong)(tong)、太陽能(neng)熱水器系統(tong)(tong)等(deng)。④. 電(dian)(dian)信、電(dian)(dian)氣用配管(guan)。⑤. 電(dian)(dian)鍍、石(shi)油(you)、化工廠(chang)輸送管(guan)道系統(tong)(tong)。

4. 交(jiao)聯聚乙烯(xi)PEX管(guan)的主要標準見表4.3.15。