1. 生產PEX管的(de)主要(yao)原料(liao)是(shi)HDPE以(yi)及引(yin)發劑(ji)、交(jiao)聯(lian)劑(ji)、催化劑(ji)等助劑(ji)，如(ru)有特殊(shu)要(yao)求還(huan)可以(yi)添(tian)加其(qi)他改質劑(ji)。PEX管采用(yong)(yong)世界上先進(jin)(jin)的(de)一步法（MONSOIL法）技術制造，采用(yong)(yong)普通聚(ju)乙烯原料(liao)加入硅烷接(jie)枝料(liao)，在聚(ju)合物(wu)大分子鏈間形(xing)(xing)成(cheng)化學共價(jia)鍵以(yi)取代原有的(de)范(fan)德華力，從而(er)(er)形(xing)(xing)成(cheng)三維(wei)(wei)交(jiao)鏈網狀結構的(de)交(jiao)聯(lian)聚(ju)乙烯，其(qi)交(jiao)聯(lian)度可達60％～89％，使其(qi)具有優良的(de)理化性能。PEX 管交(jiao)聯(lian)劑(ji)（添(tian)加劑(ji)）是(shi)對其(qi)原線型分子結構起裂解作(zuo)用(yong)(yong)形(xing)(xing)成(cheng)接(jie)枝料(liao)，進(jin)(jin)而(er)(er)形(xing)(xing)成(cheng)三維(wei)(wei)網狀結構。抗氧劑(ji)及色粒的(de)作(zuo)用(yong)(yong)是(shi)提高PEX管的(de)耐腐性，防(fang)止日光長(chang)期(qi)照(zhao)射發生物(wu)性變化，能夠(gou)抵御(yu)紫外線的(de)長(chang)期(qi)侵蝕，從而(er)(er)延長(chang)其(qi)使用(yong)(yong)壽命。
2. PEX管的性(xing)能和特點。
①. PEX管(guan)與鍍鋅鋼管(guan)的性(xing)能比較見表4.3.14。
②. PEX管(guan)(guan)(guan)(guan)(guan)與(yu)UPVC管(guan)(guan)(guan)(guan)(guan)、鋁塑(su)復合管(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)(neng)異同點。從性(xing)能(neng)(neng)上看(kan)，三(san)種管(guan)(guan)(guan)(guan)(guan)材(cai)除(chu)具有(you)不銹(xiu)蝕、不結垢(gou)、不滋生(sheng)(sheng)細(xi)菌和(he)安裝簡便等(deng)共性(xing)外(wai)，還(huan)有(you)一(yi)些區別：a.優良的(de)(de)(de)耐溫(wen)(wen)性(xing)能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度為-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度為5～45℃，鋁塑(su)復合管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度為-40～85℃。b．防振(zhen)性(xing)能(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)由(you)(you)于(yu)采用膠水(shui)(shui)粘(zhan)接(jie)，防振(zhen)性(xing)能(neng)(neng)略遜色于(yu)鋁塑(su)復合管(guan)(guan)(guan)(guan)(guan)和(he)PEX管(guan)(guan)(guan)(guan)(guan)。c．使(shi)用壽命(ming)(ming)。UPVC管(guan)(guan)(guan)(guan)(guan)和(he)鋁塑(su)復合管(guan)(guan)(guan)(guan)(guan)使(shi)用壽命(ming)(ming)約20～30年，PEX管(guan)(guan)(guan)(guan)(guan)約50年。d．抗化(hua)學腐蝕性(xing)能(neng)(neng)。由(you)(you)于(yu)PEX管(guan)(guan)(guan)(guan)(guan)其分子結構，即使(shi)處于(yu)高溫(wen)(wen)下(xia)也(ye)能(neng)(neng)輸(shu)送多種化(hua)學物質(zhi)(zhi)，而(er)(er)不被腐蝕。e．良好的(de)(de)(de)記憶(yi)性(xing)能(neng)(neng)。當PEX管(guan)(guan)(guan)(guan)(guan)被加熱到適(shi)當溫(wen)(wen)度（小(xiao)于(yu)180℃）時(shi)(shi)會(hui)變成(cheng)透明狀，再冷卻時(shi)(shi)會(hui)恢復到原(yuan)來(lai)(lai)的(de)(de)(de)形(xing)狀，即在(zai)使(shi)用過(guo)程中(zhong)(zhong)(zhong)任(ren)何錯(cuo)誤的(de)(de)(de)彎曲都可以(yi)(yi)通(tong)過(guo)熱風槍加以(yi)(yi)矯(jiao)正，使(shi)用起來(lai)(lai)更加自如。f.不結垢(gou)。水(shui)(shui)中(zhong)(zhong)(zhong)碳(tan)酸氫鈣(gai)及鎂離子的(de)(de)(de)存在(zai)易(yi)形(xing)成(cheng)沉淀物，慢(man)慢(man)使(shi)管(guan)(guan)(guan)(guan)(guan)道堵塞(sai)，而(er)(er)PEX管(guan)(guan)(guan)(guan)(guan)具有(you)較低(di)的(de)(de)(de)表(biao)面張力以(yi)(yi)致使(shi)高表(biao)面張力的(de)(de)(de)水(shui)(shui)不會(hui)被浸潤管(guan)(guan)(guan)(guan)(guan)壁，從而(er)(er)防止管(guan)(guan)(guan)(guan)(guan)內水(shui)(shui)垢(gou)的(de)(de)(de)形(xing)成(cheng)。g.環保性(xing)能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)是無污染(ran)環境的(de)(de)(de)綠色管(guan)(guan)(guan)(guan)(guan)材(cai)，不含任(ren)何毒素，也(ye)不釋(shi)放有(you)害物質(zhi)(zhi)，焚燒后只產生(sheng)(sheng)水(shui)(shui)和(he)二氧化(hua)碳(tan)。而(er)(er)UPVC管(guan)(guan)(guan)(guan)(guan)在(zai)生(sheng)(sheng)產過(guo)程中(zhong)(zhong)(zhong)加入(ru)(ru)重金屬(shu)添加劑(ji)，同時(shi)(shi)本身(shen)殘(can)存的(de)(de)(de)單(dan)體氯乙烯在(zai)使(shi)用時(shi)(shi)一(yi)起進入(ru)(ru)輸(shu)送的(de)(de)(de)介質(zhi)(zhi)中(zhong)(zhong)(zhong)，易(yi)造成(cheng)介質(zhi)(zhi)污染(ran)；鋁塑(su)復合管(guan)(guan)(guan)(guan)(guan)由(you)(you)于(yu)中(zhong)(zhong)(zhong)間為鋁層(ceng)，因鋁和(he)塑(su)料的(de)(de)(de)膨脹系數(shu)不一(yi)樣，易(yi)發生(sheng)(sheng)龜(gui)裂(lie)現象，屬(shu)不可降解物質(zhi)(zhi)，其垃圾易(yi)造成(cheng)環境污染(ran)。
3. PEX管的領域。
①. 室內給水管(guan)(guan)、熱水管(guan)(guan)、純凈(jing)水輸送管(guan)(guan)。②. 食(shi)(shi)品中液(ye)體食(shi)(shi)品輸送管(guan)(guan)道。③. 水暖供熱系統(tong)(tong)、中央空調管(guan)(guan)道系統(tong)(tong)、地面輻射采暖系統(tong)(tong)、太陽能熱水器(qi)系統(tong)(tong)等。④. 電(dian)信、電(dian)氣用配管(guan)(guan)。⑤. 電(dian)鍍、石油、化工廠輸送管(guan)(guan)道系統(tong)(tong)。
4. 交(jiao)聯(lian)聚乙烯PEX管(guan)的主要標準見表4.3.15。
