1. 生產(chan)PEX管(guan)的主要(yao)原料(liao)是(shi)HDPE以(yi)及引(yin)發劑(ji)、交(jiao)聯劑(ji)、催(cui)化(hua)劑(ji)等助劑(ji)，如(ru)有特殊要(yao)求(qiu)還可以(yi)添加(jia)其(qi)(qi)他改質劑(ji)。PEX管(guan)采用(yong)(yong)世(shi)界上先進的一步法(fa)（MONSOIL法(fa)）技術制(zhi)造，采用(yong)(yong)普通(tong)聚乙烯原料(liao)加(jia)入硅烷(wan)接枝(zhi)料(liao)，在聚合物大分(fen)(fen)子鏈間形成(cheng)(cheng)化(hua)學(xue)共(gong)價(jia)鍵(jian)以(yi)取代原有的范德(de)華力，從(cong)而(er)形成(cheng)(cheng)三維交(jiao)鏈網狀結構的交(jiao)聯聚乙烯，其(qi)(qi)交(jiao)聯度(du)可達60％～89％，使(shi)其(qi)(qi)具有優良的理(li)化(hua)性(xing)能。PEX 管(guan)交(jiao)聯劑(ji)（添加(jia)劑(ji)）是(shi)對其(qi)(qi)原線(xian)型分(fen)(fen)子結構起裂解作用(yong)(yong)形成(cheng)(cheng)接枝(zhi)料(liao)，進而(er)形成(cheng)(cheng)三維網狀結構。抗(kang)氧劑(ji)及色粒的作用(yong)(yong)是(shi)提高PEX管(guan)的耐(nai)腐性(xing)，防止日光長(chang)期照射(she)發生物性(xing)變(bian)化(hua)，能夠抵御(yu)紫外線(xian)的長(chang)期侵(qin)蝕，從(cong)而(er)延長(chang)其(qi)(qi)使(shi)用(yong)(yong)壽命。
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4.3.14。
②. PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、鋁(lv)塑(su)(su)復合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)性(xing)(xing)(xing)能(neng)異同點。從性(xing)(xing)(xing)能(neng)上看，三種管(guan)(guan)(guan)(guan)(guan)(guan)(guan)材除具(ju)有(you)不(bu)(bu)(bu)銹蝕、不(bu)(bu)(bu)結(jie)垢(gou)、不(bu)(bu)(bu)滋生細菌(jun)和安(an)裝(zhuang)簡便等共性(xing)(xing)(xing)外，還有(you)一(yi)些區別：a.優良(liang)的(de)耐溫(wen)(wen)性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度(du)為(wei)(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度(du)為(wei)(wei)5～45℃，鋁(lv)塑(su)(su)復合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)(wen)度(du)為(wei)(wei)-40～85℃。b．防振性(xing)(xing)(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)采用膠水(shui)粘接，防振性(xing)(xing)(xing)能(neng)略遜色(se)于(yu)鋁(lv)塑(su)(su)復合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。c．使(shi)用壽命。UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和鋁(lv)塑(su)(su)復合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)使(shi)用壽命約(yue)20～30年，PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)約(yue)50年。d．抗化(hua)(hua)學腐(fu)蝕性(xing)(xing)(xing)能(neng)。由于(yu)PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)其分子結(jie)構，即(ji)使(shi)處于(yu)高溫(wen)(wen)下也(ye)能(neng)輸(shu)送多種化(hua)(hua)學物質(zhi)，而(er)(er)(er)不(bu)(bu)(bu)被腐(fu)蝕。e．良(liang)好(hao)的(de)記(ji)憶性(xing)(xing)(xing)能(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)被加(jia)熱到(dao)(dao)適當(dang)溫(wen)(wen)度(du)（小于(yu)180℃）時(shi)會(hui)變成(cheng)(cheng)(cheng)透明狀，再冷卻時(shi)會(hui)恢復到(dao)(dao)原(yuan)來的(de)形狀，即(ji)在(zai)使(shi)用過程中任何錯誤的(de)彎曲都可(ke)以通(tong)過熱風(feng)槍(qiang)加(jia)以矯正，使(shi)用起來更加(jia)自如。f.不(bu)(bu)(bu)結(jie)垢(gou)。水(shui)中碳(tan)酸(suan)氫鈣及(ji)鎂離(li)子的(de)存(cun)在(zai)易(yi)(yi)形成(cheng)(cheng)(cheng)沉淀物，慢(man)(man)慢(man)(man)使(shi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道堵塞，而(er)(er)(er)PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)具(ju)有(you)較低的(de)表面張(zhang)力以致使(shi)高表面張(zhang)力的(de)水(shui)不(bu)(bu)(bu)會(hui)被浸潤管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)，從而(er)(er)(er)防止管(guan)(guan)(guan)(guan)(guan)(guan)(guan)內水(shui)垢(gou)的(de)形成(cheng)(cheng)(cheng)。g.環保性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)(guan)(guan)是無污染環境的(de)綠色(se)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)材，不(bu)(bu)(bu)含(han)任何毒素，也(ye)不(bu)(bu)(bu)釋放(fang)有(you)害物質(zhi)，焚燒(shao)后只產生水(shui)和二氧化(hua)(hua)碳(tan)。而(er)(er)(er)UPVC管(guan)(guan)(guan)(guan)(guan)(guan)(guan)在(zai)生產過程中加(jia)入重金屬添(tian)加(jia)劑，同時(shi)本身殘存(cun)的(de)單體氯乙烯在(zai)使(shi)用時(shi)一(yi)起進(jin)入輸(shu)送的(de)介(jie)質(zhi)中，易(yi)(yi)造成(cheng)(cheng)(cheng)介(jie)質(zhi)污染；鋁(lv)塑(su)(su)復合(he)(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)由于(yu)中間為(wei)(wei)鋁(lv)層，因鋁(lv)和塑(su)(su)料的(de)膨(peng)脹(zhang)系數不(bu)(bu)(bu)一(yi)樣，易(yi)(yi)發生龜裂現象，屬不(bu)(bu)(bu)可(ke)降解(jie)物質(zhi)，其垃圾易(yi)(yi)造成(cheng)(cheng)(cheng)環境污染。
3. PEX管的領(ling)域。
①. 室內給水(shui)管、熱水(shui)管、純(chun)凈水(shui)輸送(song)管。②. 食品中液體(ti)食品輸送(song)管道。③. 水(shui)暖供熱系(xi)統(tong)、中央空調管道系(xi)統(tong)、地面輻(fu)射采暖系(xi)統(tong)、太陽能熱水(shui)器系(xi)統(tong)等。④. 電信、電氣用配管。⑤. 電鍍、石油、化工廠輸送(song)管道系(xi)統(tong)。
4. 交(jiao)聯聚乙烯PEX管的主(zhu)要標準見表4.3.15。
