1. 生產PEX管(guan)(guan)的(de)(de)(de)主(zhu)要原料是HDPE以(yi)及引發劑(ji)(ji)、交(jiao)聯(lian)劑(ji)(ji)、催化(hua)劑(ji)(ji)等助劑(ji)(ji)，如(ru)有(you)(you)特殊要求還(huan)可(ke)以(yi)添(tian)加(jia)其(qi)他(ta)改(gai)質劑(ji)(ji)。PEX管(guan)(guan)采用(yong)(yong)世界上先進(jin)(jin)的(de)(de)(de)一步法（MONSOIL法）技(ji)術(shu)制造(zao)，采用(yong)(yong)普通聚乙烯原料加(jia)入硅烷接枝料，在聚合物(wu)(wu)大分子鏈間(jian)形(xing)成化(hua)學共價鍵以(yi)取(qu)代原有(you)(you)的(de)(de)(de)范德華力，從(cong)(cong)而(er)形(xing)成三維(wei)交(jiao)鏈網狀(zhuang)結構的(de)(de)(de)交(jiao)聯(lian)聚乙烯，其(qi)交(jiao)聯(lian)度可(ke)達60％～89％，使其(qi)具有(you)(you)優良的(de)(de)(de)理化(hua)性(xing)能。PEX 管(guan)(guan)交(jiao)聯(lian)劑(ji)(ji)（添(tian)加(jia)劑(ji)(ji)）是對其(qi)原線型分子結構起裂解作(zuo)用(yong)(yong)形(xing)成接枝料，進(jin)(jin)而(er)形(xing)成三維(wei)網狀(zhuang)結構。抗氧劑(ji)(ji)及色(se)粒的(de)(de)(de)作(zuo)用(yong)(yong)是提(ti)高(gao)PEX管(guan)(guan)的(de)(de)(de)耐腐(fu)性(xing)，防(fang)止日光(guang)長期(qi)照射發生物(wu)(wu)性(xing)變(bian)化(hua)，能夠抵御紫外線的(de)(de)(de)長期(qi)侵蝕，從(cong)(cong)而(er)延長其(qi)使用(yong)(yong)壽命。
2. PEX管的(de)性能和特點。
①. PEX管與鍍鋅鋼管的性能比較見(jian)表(biao)4.3.14。
②. PEX管(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)、鋁(lv)塑(su)(su)復(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)(neng)(neng)異同點。從(cong)性(xing)能(neng)(neng)(neng)上看，三種(zhong)管(guan)(guan)(guan)(guan)(guan)材除(chu)具有不(bu)銹蝕(shi)(shi)(shi)、不(bu)結(jie)垢(gou)、不(bu)滋生細菌(jun)和安裝簡便等共性(xing)外，還有一些(xie)區別(bie)：a.優(you)良的(de)耐溫(wen)(wen)(wen)性(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)溫(wen)(wen)(wen)度(du)(du)為-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)溫(wen)(wen)(wen)度(du)(du)為5～45℃，鋁(lv)塑(su)(su)復(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)溫(wen)(wen)(wen)度(du)(du)為-40～85℃。b．防(fang)振性(xing)能(neng)(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)由(you)于(yu)采用(yong)膠水(shui)粘(zhan)接，防(fang)振性(xing)能(neng)(neng)(neng)略遜色于(yu)鋁(lv)塑(su)(su)復(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)(shi)用(yong)壽命(ming)。UPVC管(guan)(guan)(guan)(guan)(guan)和鋁(lv)塑(su)(su)復(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)壽命(ming)約(yue)20～30年(nian)，PEX管(guan)(guan)(guan)(guan)(guan)約(yue)50年(nian)。d．抗化(hua)學腐(fu)蝕(shi)(shi)(shi)性(xing)能(neng)(neng)(neng)。由(you)于(yu)PEX管(guan)(guan)(guan)(guan)(guan)其分子(zi)結(jie)構(gou)，即使(shi)(shi)(shi)處于(yu)高(gao)溫(wen)(wen)(wen)下也能(neng)(neng)(neng)輸送(song)多種(zhong)化(hua)學物(wu)質(zhi)，而不(bu)被腐(fu)蝕(shi)(shi)(shi)。e．良好(hao)的(de)記憶(yi)性(xing)能(neng)(neng)(neng)。當PEX管(guan)(guan)(guan)(guan)(guan)被加(jia)熱到適當溫(wen)(wen)(wen)度(du)(du)（小于(yu)180℃）時會(hui)變(bian)成(cheng)透明(ming)狀，再冷卻時會(hui)恢復(fu)到原來的(de)形狀，即在(zai)使(shi)(shi)(shi)用(yong)過程(cheng)中(zhong)(zhong)(zhong)任何(he)錯誤的(de)彎曲都可(ke)以通過熱風槍加(jia)以矯正，使(shi)(shi)(shi)用(yong)起來更加(jia)自如。f.不(bu)結(jie)垢(gou)。水(shui)中(zhong)(zhong)(zhong)碳酸氫鈣及鎂離子(zi)的(de)存(cun)在(zai)易形成(cheng)沉淀物(wu)，慢(man)慢(man)使(shi)(shi)(shi)管(guan)(guan)(guan)(guan)(guan)道堵塞，而PEX管(guan)(guan)(guan)(guan)(guan)具有較低的(de)表面(mian)張(zhang)力以致使(shi)(shi)(shi)高(gao)表面(mian)張(zhang)力的(de)水(shui)不(bu)會(hui)被浸潤管(guan)(guan)(guan)(guan)(guan)壁(bi)，從(cong)而防(fang)止管(guan)(guan)(guan)(guan)(guan)內(nei)水(shui)垢(gou)的(de)形成(cheng)。g.環(huan)保性(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)是無(wu)污染(ran)環(huan)境的(de)綠色管(guan)(guan)(guan)(guan)(guan)材，不(bu)含任何(he)毒(du)素，也不(bu)釋放(fang)有害(hai)物(wu)質(zhi)，焚(fen)燒后(hou)只產生水(shui)和二氧(yang)化(hua)碳。而UPVC管(guan)(guan)(guan)(guan)(guan)在(zai)生產過程(cheng)中(zhong)(zhong)(zhong)加(jia)入(ru)重(zhong)金(jin)屬添(tian)加(jia)劑，同時本身(shen)殘存(cun)的(de)單體氯乙(yi)烯在(zai)使(shi)(shi)(shi)用(yong)時一起進入(ru)輸送(song)的(de)介(jie)質(zhi)中(zhong)(zhong)(zhong)，易造(zao)成(cheng)介(jie)質(zhi)污染(ran)；鋁(lv)塑(su)(su)復(fu)合(he)(he)管(guan)(guan)(guan)(guan)(guan)由(you)于(yu)中(zhong)(zhong)(zhong)間為鋁(lv)層，因鋁(lv)和塑(su)(su)料(liao)的(de)膨脹系數不(bu)一樣，易發生龜裂現象，屬不(bu)可(ke)降解物(wu)質(zhi)，其垃圾(ji)易造(zao)成(cheng)環(huan)境污染(ran)。
3. PEX管的領域。
①. 室內給水管(guan)(guan)、熱水管(guan)(guan)、純凈水輸(shu)(shu)送管(guan)(guan)。②. 食品(pin)中液體食品(pin)輸(shu)(shu)送管(guan)(guan)道(dao)。③. 水暖(nuan)供(gong)熱系(xi)(xi)統(tong)(tong)、中央空調管(guan)(guan)道(dao)系(xi)(xi)統(tong)(tong)、地面(mian)輻射(she)采暖(nuan)系(xi)(xi)統(tong)(tong)、太陽能熱水器系(xi)(xi)統(tong)(tong)等。④. 電(dian)信、電(dian)氣用配管(guan)(guan)。⑤. 電(dian)鍍、石油、化工廠輸(shu)(shu)送管(guan)(guan)道(dao)系(xi)(xi)統(tong)(tong)。
4. 交(jiao)聯聚乙烯PEX管的主要標(biao)準見(jian)表(biao)4.3.15。
