1. 生(sheng)產PEX管的(de)主要原(yuan)料(liao)是(shi)HDPE以(yi)及(ji)(ji)引(yin)發(fa)劑(ji)(ji)(ji)、交(jiao)(jiao)聯(lian)劑(ji)(ji)(ji)、催化(hua)劑(ji)(ji)(ji)等助劑(ji)(ji)(ji)，如有(you)(you)特殊要求還可以(yi)添加(jia)(jia)其他改質劑(ji)(ji)(ji)。PEX管采用(yong)世界上先進的(de)一步法（MONSOIL法）技術制造，采用(yong)普通聚(ju)乙烯原(yuan)料(liao)加(jia)(jia)入硅(gui)烷接(jie)枝料(liao)，在聚(ju)合物大分(fen)子鏈(lian)間形(xing)成化(hua)學共(gong)價鍵以(yi)取(qu)代原(yuan)有(you)(you)的(de)范德華力，從而形(xing)成三維交(jiao)(jiao)鏈(lian)網狀結(jie)構(gou)的(de)交(jiao)(jiao)聯(lian)聚(ju)乙烯，其交(jiao)(jiao)聯(lian)度可達(da)60％～89％，使(shi)其具(ju)有(you)(you)優良的(de)理化(hua)性能。PEX 管交(jiao)(jiao)聯(lian)劑(ji)(ji)(ji)（添加(jia)(jia)劑(ji)(ji)(ji)）是(shi)對其原(yuan)線型分(fen)子結(jie)構(gou)起裂解作(zuo)用(yong)形(xing)成接(jie)枝料(liao)，進而形(xing)成三維網狀結(jie)構(gou)。抗氧劑(ji)(ji)(ji)及(ji)(ji)色粒的(de)作(zuo)用(yong)是(shi)提高PEX管的(de)耐腐性，防止日光(guang)長(chang)期(qi)(qi)照射(she)發(fa)生(sheng)物性變(bian)化(hua)，能夠(gou)抵御紫外線的(de)長(chang)期(qi)(qi)侵蝕(shi)，從而延(yan)長(chang)其使(shi)用(yong)壽(shou)命(ming)。
2. PEX管的性能和特點(dian)。
①. PEX管與鍍鋅鋼管的性能比較見表(biao)4.3.14。
②. PEX管(guan)(guan)(guan)(guan)與(yu)UPVC管(guan)(guan)(guan)(guan)、鋁(lv)(lv)塑復合(he)管(guan)(guan)(guan)(guan)性(xing)(xing)(xing)能(neng)異同(tong)點。從性(xing)(xing)(xing)能(neng)上(shang)看，三種管(guan)(guan)(guan)(guan)材除具(ju)有不(bu)(bu)銹蝕(shi)、不(bu)(bu)結(jie)垢(gou)、不(bu)(bu)滋生細菌和(he)(he)(he)(he)安裝簡(jian)便(bian)等共性(xing)(xing)(xing)外(wai)，還有一些(xie)區別：a.優良的(de)耐溫(wen)性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為(wei)5～45℃，鋁(lv)(lv)塑復合(he)管(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為(wei)-40～85℃。b．防(fang)(fang)振(zhen)性(xing)(xing)(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)由于(yu)(yu)(yu)采用(yong)膠(jiao)水粘接(jie)，防(fang)(fang)振(zhen)性(xing)(xing)(xing)能(neng)略遜色(se)于(yu)(yu)(yu)鋁(lv)(lv)塑復合(he)管(guan)(guan)(guan)(guan)和(he)(he)(he)(he)PEX管(guan)(guan)(guan)(guan)。c．使(shi)用(yong)壽命(ming)。UPVC管(guan)(guan)(guan)(guan)和(he)(he)(he)(he)鋁(lv)(lv)塑復合(he)管(guan)(guan)(guan)(guan)使(shi)用(yong)壽命(ming)約20～30年，PEX管(guan)(guan)(guan)(guan)約50年。d．抗化(hua)(hua)學(xue)腐蝕(shi)性(xing)(xing)(xing)能(neng)。由于(yu)(yu)(yu)PEX管(guan)(guan)(guan)(guan)其分子結(jie)構，即使(shi)處于(yu)(yu)(yu)高溫(wen)下也(ye)(ye)能(neng)輸(shu)送(song)多種化(hua)(hua)學(xue)物(wu)質(zhi)，而(er)不(bu)(bu)被腐蝕(shi)。e．良好的(de)記憶性(xing)(xing)(xing)能(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)被加(jia)(jia)熱到適(shi)當(dang)溫(wen)度（小于(yu)(yu)(yu)180℃）時(shi)(shi)會(hui)變成(cheng)透(tou)明狀，再冷卻時(shi)(shi)會(hui)恢復到原來(lai)的(de)形狀，即在使(shi)用(yong)過(guo)(guo)程(cheng)中任何錯誤的(de)彎曲都可(ke)以通(tong)過(guo)(guo)熱風槍(qiang)加(jia)(jia)以矯(jiao)正(zheng)，使(shi)用(yong)起(qi)來(lai)更加(jia)(jia)自如。f.不(bu)(bu)結(jie)垢(gou)。水中碳酸(suan)氫鈣及鎂離子的(de)存(cun)在易(yi)形成(cheng)沉淀(dian)物(wu)，慢慢使(shi)管(guan)(guan)(guan)(guan)道堵(du)塞，而(er)PEX管(guan)(guan)(guan)(guan)具(ju)有較低的(de)表(biao)面(mian)張力以致使(shi)高表(biao)面(mian)張力的(de)水不(bu)(bu)會(hui)被浸潤管(guan)(guan)(guan)(guan)壁，從而(er)防(fang)(fang)止(zhi)管(guan)(guan)(guan)(guan)內水垢(gou)的(de)形成(cheng)。g.環(huan)保性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)是無污染環(huan)境的(de)綠色(se)管(guan)(guan)(guan)(guan)材，不(bu)(bu)含任何毒(du)素，也(ye)(ye)不(bu)(bu)釋放有害物(wu)質(zhi)，焚燒后只產(chan)(chan)生水和(he)(he)(he)(he)二氧(yang)化(hua)(hua)碳。而(er)UPVC管(guan)(guan)(guan)(guan)在生產(chan)(chan)過(guo)(guo)程(cheng)中加(jia)(jia)入重金屬添加(jia)(jia)劑(ji)，同(tong)時(shi)(shi)本(ben)身殘存(cun)的(de)單(dan)體(ti)氯乙烯在使(shi)用(yong)時(shi)(shi)一起(qi)進入輸(shu)送(song)的(de)介(jie)質(zhi)中，易(yi)造(zao)成(cheng)介(jie)質(zhi)污染；鋁(lv)(lv)塑復合(he)管(guan)(guan)(guan)(guan)由于(yu)(yu)(yu)中間為(wei)鋁(lv)(lv)層，因鋁(lv)(lv)和(he)(he)(he)(he)塑料(liao)的(de)膨(peng)脹系數(shu)不(bu)(bu)一樣，易(yi)發生龜裂現(xian)象，屬不(bu)(bu)可(ke)降解(jie)物(wu)質(zhi)，其垃圾(ji)易(yi)造(zao)成(cheng)環(huan)境污染。
3. PEX管的領(ling)域。
①. 室內(nei)給水管(guan)(guan)、熱水管(guan)(guan)、純凈水輸送管(guan)(guan)。②. 食品中液(ye)體食品輸送管(guan)(guan)道。③. 水暖(nuan)供(gong)熱系(xi)統(tong)(tong)(tong)、中央空調(diao)管(guan)(guan)道系(xi)統(tong)(tong)(tong)、地(di)面(mian)輻(fu)射采暖(nuan)系(xi)統(tong)(tong)(tong)、太陽能熱水器(qi)系(xi)統(tong)(tong)(tong)等。④. 電信、電氣用(yong)配管(guan)(guan)。⑤. 電鍍、石油、化工廠(chang)輸送管(guan)(guan)道系(xi)統(tong)(tong)(tong)。
4. 交聯聚乙烯PEX管的主要標準見表4.3.15。
