1. 生產PEX管(guan)(guan)的(de)主要(yao)(yao)原(yuan)料是(shi)HDPE以及引發劑(ji)、交聯(lian)(lian)劑(ji)、催(cui)化(hua)劑(ji)等助劑(ji)，如有(you)特殊要(yao)(yao)求還可(ke)以添(tian)加(jia)其(qi)他改(gai)質劑(ji)。PEX管(guan)(guan)采用(yong)世界上先進(jin)的(de)一(yi)步法（MONSOIL法）技術制造，采用(yong)普通聚乙烯原(yuan)料加(jia)入硅烷接枝(zhi)料，在(zai)聚合物(wu)大分子鏈間形(xing)(xing)(xing)(xing)成化(hua)學(xue)共價鍵以取代原(yuan)有(you)的(de)范德華(hua)力，從(cong)而(er)(er)形(xing)(xing)(xing)(xing)成三(san)維交鏈網狀(zhuang)結構的(de)交聯(lian)(lian)聚乙烯，其(qi)交聯(lian)(lian)度可(ke)達(da)60％～89％，使(shi)(shi)其(qi)具有(you)優良的(de)理化(hua)性能。PEX 管(guan)(guan)交聯(lian)(lian)劑(ji)（添(tian)加(jia)劑(ji)）是(shi)對其(qi)原(yuan)線(xian)型分子結構起裂(lie)解作用(yong)形(xing)(xing)(xing)(xing)成接枝(zhi)料，進(jin)而(er)(er)形(xing)(xing)(xing)(xing)成三(san)維網狀(zhuang)結構。抗氧劑(ji)及色粒的(de)作用(yong)是(shi)提高PEX管(guan)(guan)的(de)耐(nai)腐(fu)性，防止日光(guang)長(chang)期照射發生物(wu)性變化(hua)，能夠抵(di)御紫(zi)外線(xian)的(de)長(chang)期侵蝕，從(cong)而(er)(er)延長(chang)其(qi)使(shi)(shi)用(yong)壽命。

  2. PEX管的(de)性(xing)能(neng)和特點。

    ①. PEX管(guan)與(yu)鍍鋅鋼管(guan)的性能比較(jiao)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(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)性(xing)(xing)能(neng)(neng)(neng)異同點。從性(xing)(xing)能(neng)(neng)(neng)上看(kan)，三(san)種管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)除具(ju)(ju)有(you)不(bu)(bu)(bu)(bu)銹蝕、不(bu)(bu)(bu)(bu)結垢(gou)(gou)、不(bu)(bu)(bu)(bu)滋(zi)生細菌和安裝簡(jian)便等共性(xing)(xing)外(wai)，還(huan)有(you)一些區別：a.優良的(de)(de)(de)耐(nai)溫(wen)性(xing)(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用溫(wen)度(du)為(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用溫(wen)度(du)為(wei)5～45℃，鋁塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用溫(wen)度(du)為(wei)-40～85℃。b．防振性(xing)(xing)能(neng)(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)由(you)(you)于(yu)(yu)采(cai)用膠(jiao)水(shui)(shui)粘接，防振性(xing)(xing)能(neng)(neng)(neng)略(lve)遜色于(yu)(yu)鋁塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)(shi)用壽(shou)命。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)和鋁塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)使(shi)(shi)用壽(shou)命約20～30年，PEX管(guan)(guan)(guan)(guan)(guan)(guan)約50年。d．抗化(hua)學腐蝕性(xing)(xing)能(neng)(neng)(neng)。由(you)(you)于(yu)(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)其(qi)分(fen)子結構，即使(shi)(shi)處于(yu)(yu)高溫(wen)下也能(neng)(neng)(neng)輸(shu)送多種化(hua)學物質(zhi)，而不(bu)(bu)(bu)(bu)被腐蝕。e．良好的(de)(de)(de)記憶(yi)性(xing)(xing)能(neng)(neng)(neng)。當PEX管(guan)(guan)(guan)(guan)(guan)(guan)被加熱到適當溫(wen)度(du)（小(xiao)于(yu)(yu)180℃）時(shi)會變成透明(ming)狀(zhuang)，再冷卻時(shi)會恢復到原(yuan)來的(de)(de)(de)形狀(zhuang)，即在(zai)使(shi)(shi)用過程(cheng)中(zhong)任(ren)何錯誤的(de)(de)(de)彎曲都可以(yi)通(tong)過熱風槍加以(yi)矯正，使(shi)(shi)用起來更加自如。f.不(bu)(bu)(bu)(bu)結垢(gou)(gou)。水(shui)(shui)中(zhong)碳酸氫鈣及鎂離(li)子的(de)(de)(de)存在(zai)易(yi)(yi)形成沉(chen)淀物，慢慢使(shi)(shi)管(guan)(guan)(guan)(guan)(guan)(guan)道堵塞，而PEX管(guan)(guan)(guan)(guan)(guan)(guan)具(ju)(ju)有(you)較低的(de)(de)(de)表面張力以(yi)致使(shi)(shi)高表面張力的(de)(de)(de)水(shui)(shui)不(bu)(bu)(bu)(bu)會被浸潤管(guan)(guan)(guan)(guan)(guan)(guan)壁，從而防止管(guan)(guan)(guan)(guan)(guan)(guan)內(nei)水(shui)(shui)垢(gou)(gou)的(de)(de)(de)形成。g.環(huan)保性(xing)(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)是無污(wu)染(ran)環(huan)境的(de)(de)(de)綠色管(guan)(guan)(guan)(guan)(guan)(guan)材(cai)，不(bu)(bu)(bu)(bu)含任(ren)何毒素(su)，也不(bu)(bu)(bu)(bu)釋放有(you)害(hai)物質(zhi)，焚燒后只產(chan)生水(shui)(shui)和二氧(yang)化(hua)碳。而UPVC管(guan)(guan)(guan)(guan)(guan)(guan)在(zai)生產(chan)過程(cheng)中(zhong)加入(ru)(ru)重金屬添(tian)加劑，同時(shi)本身(shen)殘存的(de)(de)(de)單體氯乙(yi)烯在(zai)使(shi)(shi)用時(shi)一起進入(ru)(ru)輸(shu)送的(de)(de)(de)介質(zhi)中(zhong)，易(yi)(yi)造(zao)(zao)成介質(zhi)污(wu)染(ran)；鋁塑(su)復合(he)管(guan)(guan)(guan)(guan)(guan)(guan)由(you)(you)于(yu)(yu)中(zhong)間為(wei)鋁層(ceng)，因鋁和塑(su)料的(de)(de)(de)膨脹系數(shu)不(bu)(bu)(bu)(bu)一樣，易(yi)(yi)發生龜裂(lie)現(xian)象，屬不(bu)(bu)(bu)(bu)可降解物質(zhi)，其(qi)垃(la)圾易(yi)(yi)造(zao)(zao)成環(huan)境污(wu)染(ran)。

  3. PEX管(guan)的(de)領(ling)域(yu)。

    ①. 室內給水(shui)管、熱(re)水(shui)管、純(chun)凈(jing)水(shui)輸(shu)送(song)(song)管。②. 食(shi)(shi)品中(zhong)液體食(shi)(shi)品輸(shu)送(song)(song)管道。③. 水(shui)暖供熱(re)系(xi)(xi)(xi)統(tong)、中(zhong)央空調管道系(xi)(xi)(xi)統(tong)、地面(mian)輻射采(cai)暖系(xi)(xi)(xi)統(tong)、太陽能熱(re)水(shui)器系(xi)(xi)(xi)統(tong)等。④. 電(dian)信、電(dian)氣用配管。⑤. 電(dian)鍍、石(shi)油(you)、化工廠(chang)輸(shu)送(song)(song)管道系(xi)(xi)(xi)統(tong)。

4. 交聯聚乙烯PEX管的主要(yao)標準(zhun)見表(biao)4.3.15。