1. 生產PEX管(guan)(guan)的(de)主要原(yuan)(yuan)料是HDPE以(yi)及(ji)引發劑(ji)、交(jiao)(jiao)(jiao)聯劑(ji)、催化(hua)劑(ji)等助劑(ji)，如有(you)特殊要求還可以(yi)添加其(qi)他改質(zhi)劑(ji)。PEX管(guan)(guan)采(cai)用(yong)世界上先進的(de)一步法（MONSOIL法）技術制造，采(cai)用(yong)普(pu)通聚乙烯原(yuan)(yuan)料加入硅烷接(jie)枝料，在聚合物大分子鏈間形成化(hua)學共價鍵(jian)以(yi)取代原(yuan)(yuan)有(you)的(de)范德(de)華力，從(cong)而(er)形成三(san)(san)維交(jiao)(jiao)(jiao)鏈網狀(zhuang)結(jie)構(gou)的(de)交(jiao)(jiao)(jiao)聯聚乙烯，其(qi)交(jiao)(jiao)(jiao)聯度(du)可達60％～89％，使其(qi)具有(you)優良的(de)理化(hua)性能(neng)。PEX 管(guan)(guan)交(jiao)(jiao)(jiao)聯劑(ji)（添加劑(ji)）是對其(qi)原(yuan)(yuan)線(xian)型(xing)分子結(jie)構(gou)起(qi)裂解作用(yong)形成接(jie)枝料，進而(er)形成三(san)(san)維網狀(zhuang)結(jie)構(gou)。抗氧(yang)劑(ji)及(ji)色粒的(de)作用(yong)是提高PEX管(guan)(guan)的(de)耐(nai)腐性，防止日光(guang)長(chang)(chang)(chang)期(qi)照(zhao)射發生物性變化(hua)，能(neng)夠抵御紫(zi)外線(xian)的(de)長(chang)(chang)(chang)期(qi)侵蝕(shi)，從(cong)而(er)延長(chang)(chang)(chang)其(qi)使用(yong)壽命。
2. PEX管(guan)的(de)性能和特點。
①. PEX管與鍍鋅鋼管的性能比較(jiao)見表(biao)4.3.14。
②. PEX管(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)、鋁(lv)(lv)(lv)(lv)塑(su)(su)(su)復合管(guan)(guan)(guan)(guan)性能(neng)(neng)異同點。從性能(neng)(neng)上看(kan)，三種管(guan)(guan)(guan)(guan)材除具有不(bu)(bu)銹蝕、不(bu)(bu)結垢(gou)、不(bu)(bu)滋生細(xi)菌和安裝簡(jian)便等共性外，還有一(yi)(yi)些區別：a.優良的耐(nai)溫(wen)性能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)溫(wen)度為-70～110℃，UPVC管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)溫(wen)度為5～45℃，鋁(lv)(lv)(lv)(lv)塑(su)(su)(su)復合管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)溫(wen)度為-40～85℃。b．防振性能(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)由于(yu)(yu)采用(yong)膠水(shui)粘接，防振性能(neng)(neng)略(lve)遜色于(yu)(yu)鋁(lv)(lv)(lv)(lv)塑(su)(su)(su)復合管(guan)(guan)(guan)(guan)和PEX管(guan)(guan)(guan)(guan)。c．使(shi)(shi)用(yong)壽命。UPVC管(guan)(guan)(guan)(guan)和鋁(lv)(lv)(lv)(lv)塑(su)(su)(su)復合管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)壽命約(yue)20～30年(nian)，PEX管(guan)(guan)(guan)(guan)約(yue)50年(nian)。d．抗化(hua)(hua)學腐蝕性能(neng)(neng)。由于(yu)(yu)PEX管(guan)(guan)(guan)(guan)其分(fen)子結構，即(ji)使(shi)(shi)處(chu)于(yu)(yu)高溫(wen)下也能(neng)(neng)輸(shu)送(song)多種化(hua)(hua)學物(wu)質，而不(bu)(bu)被腐蝕。e．良好的記憶性能(neng)(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)被加(jia)(jia)熱(re)到適當(dang)溫(wen)度（小于(yu)(yu)180℃）時(shi)會(hui)變成透明狀(zhuang)，再冷卻時(shi)會(hui)恢(hui)復到原(yuan)來的形狀(zhuang)，即(ji)在使(shi)(shi)用(yong)過程中(zhong)(zhong)任(ren)何(he)錯誤(wu)的彎(wan)曲都可(ke)以通過熱(re)風槍(qiang)加(jia)(jia)以矯正(zheng)，使(shi)(shi)用(yong)起(qi)來更加(jia)(jia)自如。f.不(bu)(bu)結垢(gou)。水(shui)中(zhong)(zhong)碳酸氫(qing)鈣(gai)及鎂離(li)子的存(cun)在易(yi)(yi)形成沉淀物(wu)，慢(man)慢(man)使(shi)(shi)管(guan)(guan)(guan)(guan)道(dao)堵(du)塞，而PEX管(guan)(guan)(guan)(guan)具有較(jiao)低的表面張力以致使(shi)(shi)高表面張力的水(shui)不(bu)(bu)會(hui)被浸潤管(guan)(guan)(guan)(guan)壁，從而防止管(guan)(guan)(guan)(guan)內(nei)水(shui)垢(gou)的形成。g.環(huan)保性能(neng)(neng)。PEX管(guan)(guan)(guan)(guan)是無污(wu)染(ran)(ran)環(huan)境的綠色管(guan)(guan)(guan)(guan)材，不(bu)(bu)含任(ren)何(he)毒素，也不(bu)(bu)釋(shi)放有害(hai)物(wu)質，焚燒(shao)后只產生水(shui)和二(er)氧(yang)化(hua)(hua)碳。而UPVC管(guan)(guan)(guan)(guan)在生產過程中(zhong)(zhong)加(jia)(jia)入重金(jin)屬添(tian)加(jia)(jia)劑，同時(shi)本身殘存(cun)的單體氯乙烯(xi)在使(shi)(shi)用(yong)時(shi)一(yi)(yi)起(qi)進入輸(shu)送(song)的介(jie)質中(zhong)(zhong)，易(yi)(yi)造(zao)(zao)成介(jie)質污(wu)染(ran)(ran)；鋁(lv)(lv)(lv)(lv)塑(su)(su)(su)復合管(guan)(guan)(guan)(guan)由于(yu)(yu)中(zhong)(zhong)間(jian)為鋁(lv)(lv)(lv)(lv)層(ceng)，因鋁(lv)(lv)(lv)(lv)和塑(su)(su)(su)料的膨(peng)脹(zhang)系(xi)數不(bu)(bu)一(yi)(yi)樣(yang)，易(yi)(yi)發生龜(gui)裂現象(xiang)，屬不(bu)(bu)可(ke)降(jiang)解物(wu)質，其垃圾易(yi)(yi)造(zao)(zao)成環(huan)境污(wu)染(ran)(ran)。
3. PEX管的領域。
①. 室內(nei)給水管(guan)(guan)(guan)、熱水管(guan)(guan)(guan)、純(chun)凈水輸(shu)送管(guan)(guan)(guan)。②. 食品中液(ye)體食品輸(shu)送管(guan)(guan)(guan)道。③. 水暖供熱系(xi)統(tong)(tong)、中央(yang)空調管(guan)(guan)(guan)道系(xi)統(tong)(tong)、地面輻射采(cai)暖系(xi)統(tong)(tong)、太(tai)陽能熱水器系(xi)統(tong)(tong)等(deng)。④. 電信、電氣用配管(guan)(guan)(guan)。⑤. 電鍍、石油、化工廠(chang)輸(shu)送管(guan)(guan)(guan)道系(xi)統(tong)(tong)。
4. 交(jiao)聯(lian)聚乙(yi)烯PEX管的主要標(biao)準見(jian)表4.3.15。
