1. 生(sheng)(sheng)產PEX管(guan)的(de)(de)主要原(yuan)料(liao)(liao)是(shi)HDPE以及引發劑(ji)、交(jiao)聯(lian)劑(ji)、催化劑(ji)等助(zhu)劑(ji)，如有特殊要求還(huan)可以添(tian)加其(qi)他改質劑(ji)。PEX管(guan)采用(yong)世界上(shang)先進的(de)(de)一步(bu)法（MONSOIL法）技(ji)術(shu)制造，采用(yong)普通聚(ju)乙烯(xi)原(yuan)料(liao)(liao)加入硅烷接枝料(liao)(liao)，在聚(ju)合物(wu)大分(fen)子(zi)鏈間(jian)形(xing)成(cheng)化學(xue)共(gong)價鍵(jian)以取代原(yuan)有的(de)(de)范德華(hua)力，從而(er)(er)形(xing)成(cheng)三維(wei)交(jiao)鏈網(wang)狀結(jie)構的(de)(de)交(jiao)聯(lian)聚(ju)乙烯(xi)，其(qi)交(jiao)聯(lian)度(du)可達(da)60％～89％，使其(qi)具有優良的(de)(de)理化性(xing)(xing)能。PEX 管(guan)交(jiao)聯(lian)劑(ji)（添(tian)加劑(ji)）是(shi)對其(qi)原(yuan)線型分(fen)子(zi)結(jie)構起裂(lie)解(jie)作用(yong)形(xing)成(cheng)接枝料(liao)(liao)，進而(er)(er)形(xing)成(cheng)三維(wei)網(wang)狀結(jie)構。抗氧劑(ji)及色粒的(de)(de)作用(yong)是(shi)提高PEX管(guan)的(de)(de)耐腐性(xing)(xing)，防止日光長(chang)期照射發生(sheng)(sheng)物(wu)性(xing)(xing)變化，能夠抵御紫外線的(de)(de)長(chang)期侵蝕(shi)，從而(er)(er)延長(chang)其(qi)使用(yong)壽命(ming)。

  2. PEX管的(de)性能(neng)和(he)特點。

    ①. PEX管與鍍鋅鋼(gang)管的(de)性能比(bi)較見表4.3.14。

    ②. PEX管(guan)(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)(guan)、鋁塑復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)性能異(yi)同(tong)點。從性能上看，三種(zhong)管(guan)(guan)(guan)(guan)(guan)(guan)材除具(ju)有(you)不(bu)(bu)(bu)(bu)銹蝕(shi)、不(bu)(bu)(bu)(bu)結(jie)垢、不(bu)(bu)(bu)(bu)滋生(sheng)細菌和(he)安(an)裝簡(jian)便等(deng)共性外，還有(you)一(yi)些區(qu)別：a.優良(liang)的(de)(de)(de)(de)耐溫(wen)性能。PEX管(guan)(guan)(guan)(guan)(guan)(guan)使(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)用(yong)(yong)(yong)(yong)溫(wen)度為(wei)5～45℃，鋁塑復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)溫(wen)度為(wei)-40～85℃。b．防振性能。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)采用(yong)(yong)(yong)(yong)膠水(shui)粘(zhan)接，防振性能略(lve)遜色于(yu)鋁塑復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)和(he)PEX管(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)壽命(ming)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)和(he)鋁塑復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)壽命(ming)約20～30年，PEX管(guan)(guan)(guan)(guan)(guan)(guan)約50年。d．抗化學腐蝕(shi)性能。由于(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)其(qi)(qi)分子(zi)結(jie)構，即(ji)使(shi)(shi)(shi)處于(yu)高溫(wen)下也(ye)能輸(shu)送(song)多種(zhong)化學物(wu)質(zhi)，而(er)(er)(er)不(bu)(bu)(bu)(bu)被腐蝕(shi)。e．良(liang)好的(de)(de)(de)(de)記憶性能。當PEX管(guan)(guan)(guan)(guan)(guan)(guan)被加(jia)熱到適當溫(wen)度（小于(yu)180℃）時(shi)(shi)會(hui)變成(cheng)(cheng)透明狀，再冷卻時(shi)(shi)會(hui)恢復(fu)到原(yuan)來(lai)(lai)的(de)(de)(de)(de)形(xing)狀，即(ji)在使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)過程(cheng)中任(ren)何錯誤的(de)(de)(de)(de)彎曲都(dou)可(ke)以(yi)(yi)通過熱風槍加(jia)以(yi)(yi)矯(jiao)正，使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)起來(lai)(lai)更加(jia)自如。f.不(bu)(bu)(bu)(bu)結(jie)垢。水(shui)中碳酸氫鈣及(ji)鎂離子(zi)的(de)(de)(de)(de)存在易(yi)形(xing)成(cheng)(cheng)沉(chen)淀物(wu)，慢(man)慢(man)使(shi)(shi)(shi)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)堵(du)塞，而(er)(er)(er)PEX管(guan)(guan)(guan)(guan)(guan)(guan)具(ju)有(you)較低的(de)(de)(de)(de)表(biao)面(mian)張(zhang)(zhang)力(li)以(yi)(yi)致(zhi)使(shi)(shi)(shi)高表(biao)面(mian)張(zhang)(zhang)力(li)的(de)(de)(de)(de)水(shui)不(bu)(bu)(bu)(bu)會(hui)被浸潤管(guan)(guan)(guan)(guan)(guan)(guan)壁，從而(er)(er)(er)防止管(guan)(guan)(guan)(guan)(guan)(guan)內水(shui)垢的(de)(de)(de)(de)形(xing)成(cheng)(cheng)。g.環(huan)保性能。PEX管(guan)(guan)(guan)(guan)(guan)(guan)是無污(wu)染環(huan)境的(de)(de)(de)(de)綠色管(guan)(guan)(guan)(guan)(guan)(guan)材，不(bu)(bu)(bu)(bu)含任(ren)何毒素(su)，也(ye)不(bu)(bu)(bu)(bu)釋放有(you)害物(wu)質(zhi)，焚燒后(hou)只產(chan)生(sheng)水(shui)和(he)二(er)氧化碳。而(er)(er)(er)UPVC管(guan)(guan)(guan)(guan)(guan)(guan)在生(sheng)產(chan)過程(cheng)中加(jia)入重金屬(shu)添加(jia)劑，同(tong)時(shi)(shi)本(ben)身殘存的(de)(de)(de)(de)單體氯乙烯在使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)一(yi)起進入輸(shu)送(song)的(de)(de)(de)(de)介質(zhi)中，易(yi)造成(cheng)(cheng)介質(zhi)污(wu)染；鋁塑復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)中間為(wei)鋁層(ceng)，因鋁和(he)塑料的(de)(de)(de)(de)膨(peng)脹系數不(bu)(bu)(bu)(bu)一(yi)樣，易(yi)發生(sheng)龜裂現象，屬(shu)不(bu)(bu)(bu)(bu)可(ke)降解物(wu)質(zhi)，其(qi)(qi)垃圾(ji)易(yi)造成(cheng)(cheng)環(huan)境污(wu)染。

  3. PEX管的領(ling)域。

    ①. 室內給(gei)水(shui)管、熱水(shui)管、純凈水(shui)輸送(song)(song)管。②. 食品(pin)中(zhong)(zhong)液(ye)體(ti)食品(pin)輸送(song)(song)管道。③. 水(shui)暖(nuan)供熱系(xi)(xi)統(tong)、中(zhong)(zhong)央空(kong)調管道系(xi)(xi)統(tong)、地(di)面輻射(she)采暖(nuan)系(xi)(xi)統(tong)、太(tai)陽能熱水(shui)器系(xi)(xi)統(tong)等。④. 電(dian)信(xin)、電(dian)氣用配(pei)管。⑤. 電(dian)鍍、石油、化(hua)工廠(chang)輸送(song)(song)管道系(xi)(xi)統(tong)。

4. 交聯聚乙烯(xi)PEX管的主要標準見表4.3.15。