1. 生(sheng)產PEX管的(de)主要原(yuan)(yuan)料(liao)(liao)是HDPE以(yi)及引發劑(ji)(ji)(ji)、交聯(lian)劑(ji)(ji)(ji)、催(cui)化劑(ji)(ji)(ji)等助劑(ji)(ji)(ji)，如有特殊要求(qiu)還可以(yi)添(tian)加(jia)其(qi)(qi)他改質劑(ji)(ji)(ji)。PEX管采用(yong)世界上(shang)先進的(de)一(yi)步(bu)法(fa)（MONSOIL法(fa)）技術制造，采用(yong)普通聚(ju)乙(yi)烯(xi)原(yuan)(yuan)料(liao)(liao)加(jia)入硅烷接(jie)枝料(liao)(liao)，在聚(ju)合物(wu)大(da)分子鏈間形(xing)成化學共(gong)價鍵以(yi)取(qu)代原(yuan)(yuan)有的(de)范德華力(li)，從(cong)而(er)形(xing)成三維交鏈網狀結構的(de)交聯(lian)聚(ju)乙(yi)烯(xi)，其(qi)(qi)交聯(lian)度可達60％～89％，使(shi)其(qi)(qi)具有優良的(de)理(li)化性(xing)(xing)能(neng)。PEX 管交聯(lian)劑(ji)(ji)(ji)（添(tian)加(jia)劑(ji)(ji)(ji)）是對(dui)其(qi)(qi)原(yuan)(yuan)線(xian)型分子結構起(qi)裂解作用(yong)形(xing)成接(jie)枝料(liao)(liao)，進而(er)形(xing)成三維網狀結構。抗(kang)氧劑(ji)(ji)(ji)及色粒的(de)作用(yong)是提高PEX管的(de)耐(nai)腐性(xing)(xing)，防止日光(guang)長期(qi)照射(she)發生(sheng)物(wu)性(xing)(xing)變化，能(neng)夠(gou)抵(di)御紫外線(xian)的(de)長期(qi)侵蝕，從(cong)而(er)延長其(qi)(qi)使(shi)用(yong)壽命。
2. PEX管的(de)性能(neng)和特點。
①. PEX管與(yu)鍍鋅鋼管的性能比較見表4.3.14。
②. PEX管(guan)(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)(guan)、鋁(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)(neng)異同(tong)點。從(cong)性(xing)能(neng)(neng)上看，三種管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)除具有(you)不(bu)(bu)銹蝕、不(bu)(bu)結垢、不(bu)(bu)滋生(sheng)細菌和(he)(he)安裝簡(jian)便等共性(xing)外(wai)，還有(you)一(yi)些區別：a.優良(liang)的(de)(de)耐溫(wen)性(xing)能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)溫(wen)度為(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)溫(wen)度為(wei)5～45℃，鋁(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)溫(wen)度為(wei)-40～85℃。b．防振性(xing)能(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)由(you)于(yu)采用(yong)(yong)(yong)(yong)膠水粘接，防振性(xing)能(neng)(neng)略遜色于(yu)鋁(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)PEX管(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)壽(shou)命(ming)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)鋁(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)壽(shou)命(ming)約(yue)20～30年(nian)，PEX管(guan)(guan)(guan)(guan)(guan)(guan)約(yue)50年(nian)。d．抗化學腐蝕性(xing)能(neng)(neng)。由(you)于(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)其(qi)分子結構，即使(shi)(shi)(shi)(shi)處于(yu)高溫(wen)下也(ye)能(neng)(neng)輸(shu)送(song)多種化學物(wu)質，而不(bu)(bu)被(bei)腐蝕。e．良(liang)好的(de)(de)記憶性(xing)能(neng)(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)(guan)(guan)被(bei)加熱到適當(dang)溫(wen)度（小于(yu)180℃）時會(hui)變成透明狀，再冷卻時會(hui)恢復(fu)到原來的(de)(de)形狀，即在使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)過(guo)程(cheng)中(zhong)任(ren)何(he)錯誤的(de)(de)彎曲都(dou)可(ke)以(yi)通(tong)過(guo)熱風槍加以(yi)矯(jiao)正，使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)起(qi)來更加自如。f.不(bu)(bu)結垢。水中(zhong)碳酸氫鈣及鎂離子的(de)(de)存(cun)在易形成沉淀物(wu)，慢(man)慢(man)使(shi)(shi)(shi)(shi)管(guan)(guan)(guan)(guan)(guan)(guan)道堵塞，而PEX管(guan)(guan)(guan)(guan)(guan)(guan)具有(you)較低的(de)(de)表面張(zhang)力以(yi)致使(shi)(shi)(shi)(shi)高表面張(zhang)力的(de)(de)水不(bu)(bu)會(hui)被(bei)浸(jin)潤管(guan)(guan)(guan)(guan)(guan)(guan)壁，從(cong)而防止管(guan)(guan)(guan)(guan)(guan)(guan)內水垢的(de)(de)形成。g.環(huan)保性(xing)能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)是無污(wu)染(ran)環(huan)境的(de)(de)綠色管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)，不(bu)(bu)含任(ren)何(he)毒(du)素，也(ye)不(bu)(bu)釋放有(you)害物(wu)質，焚(fen)燒后(hou)只(zhi)產(chan)生(sheng)水和(he)(he)二氧化碳。而UPVC管(guan)(guan)(guan)(guan)(guan)(guan)在生(sheng)產(chan)過(guo)程(cheng)中(zhong)加入(ru)重金屬添加劑，同(tong)時本身殘存(cun)的(de)(de)單體氯乙烯在使(shi)(shi)(shi)(shi)用(yong)(yong)(yong)(yong)時一(yi)起(qi)進入(ru)輸(shu)送(song)的(de)(de)介(jie)質中(zhong)，易造(zao)成介(jie)質污(wu)染(ran)；鋁(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)由(you)于(yu)中(zhong)間為(wei)鋁(lv)層，因鋁(lv)和(he)(he)塑(su)(su)料的(de)(de)膨脹系數不(bu)(bu)一(yi)樣(yang)，易發(fa)生(sheng)龜裂現象，屬不(bu)(bu)可(ke)降解物(wu)質，其(qi)垃圾易造(zao)成環(huan)境污(wu)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)送(song)管(guan)(guan)。②. 食(shi)品中(zhong)液體食(shi)品輸(shu)送(song)管(guan)(guan)道(dao)。③. 水暖(nuan)供(gong)熱系(xi)(xi)(xi)統(tong)、中(zhong)央空(kong)調(diao)管(guan)(guan)道(dao)系(xi)(xi)(xi)統(tong)、地面輻射采暖(nuan)系(xi)(xi)(xi)統(tong)、太陽能熱水器系(xi)(xi)(xi)統(tong)等。④. 電(dian)(dian)信、電(dian)(dian)氣用配管(guan)(guan)。⑤. 電(dian)(dian)鍍、石油、化(hua)工廠輸(shu)送(song)管(guan)(guan)道(dao)系(xi)(xi)(xi)統(tong)。
4. 交聯聚乙烯PEX管的主要(yao)標(biao)準見表4.3.15。
