1. 生產PEX管(guan)的(de)(de)(de)主要(yao)原(yuan)(yuan)料(liao)是HDPE以及引發劑(ji)(ji)(ji)、交(jiao)(jiao)聯劑(ji)(ji)(ji)、催化劑(ji)(ji)(ji)等助(zhu)劑(ji)(ji)(ji),如(ru)有特(te)殊(shu)要(yao)求還可以添加其(qi)他改(gai)質劑(ji)(ji)(ji)。PEX管(guan)采(cai)(cai)用(yong)世界上先進的(de)(de)(de)一步法(fa)(MONSOIL法(fa))技(ji)術(shu)制造,采(cai)(cai)用(yong)普(pu)通聚乙(yi)烯(xi)原(yuan)(yuan)料(liao)加入硅烷(wan)接枝料(liao),在聚合物(wu)大分子鏈間形(xing)(xing)成化學共價鍵以取代原(yuan)(yuan)有的(de)(de)(de)范(fan)德(de)華力,從而(er)形(xing)(xing)成三維交(jiao)(jiao)鏈網(wang)狀(zhuang)結(jie)構(gou)的(de)(de)(de)交(jiao)(jiao)聯聚乙(yi)烯(xi),其(qi)交(jiao)(jiao)聯度可達60%~89%,使其(qi)具(ju)有優良(liang)的(de)(de)(de)理(li)化性(xing)能。PEX 管(guan)交(jiao)(jiao)聯劑(ji)(ji)(ji)(添加劑(ji)(ji)(ji))是對其(qi)原(yuan)(yuan)線型分子結(jie)構(gou)起(qi)裂解作用(yong)形(xing)(xing)成接枝料(liao),進而(er)形(xing)(xing)成三維網(wang)狀(zhuang)結(jie)構(gou)。抗氧劑(ji)(ji)(ji)及色粒的(de)(de)(de)作用(yong)是提(ti)高PEX管(guan)的(de)(de)(de)耐(nai)腐性(xing),防止日光長期照射發生物(wu)性(xing)變(bian)化,能夠抵御紫外(wai)線的(de)(de)(de)長期侵蝕,從而(er)延長其(qi)使用(yong)壽命。
2. PEX管的性能和特點(dian)。
①. PEX管與鍍鋅鋼管的性(xing)能比(bi)較見表4.3.14。
②. PEX管(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)、鋁(lv)塑(su)復(fu)合(he)(he)(he)管(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)異同點。從性(xing)能(neng)上看(kan),三種管(guan)(guan)(guan)(guan)(guan)材除具有不(bu)(bu)銹蝕、不(bu)(bu)結(jie)(jie)垢(gou)、不(bu)(bu)滋(zi)生(sheng)細菌和(he)安裝簡便(bian)等(deng)共性(xing)外,還有一些區別:a.優(you)良(liang)(liang)的(de)(de)耐(nai)溫(wen)性(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為-70~110℃,UPVC管(guan)(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為5~45℃,鋁(lv)塑(su)復(fu)合(he)(he)(he)管(guan)(guan)(guan)(guan)(guan)使(shi)用(yong)溫(wen)度為-40~85℃。b.防(fang)(fang)振(zhen)性(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)由于(yu)采用(yong)膠水(shui)(shui)粘接,防(fang)(fang)振(zhen)性(xing)能(neng)略遜色(se)于(yu)鋁(lv)塑(su)復(fu)合(he)(he)(he)管(guan)(guan)(guan)(guan)(guan)和(he)PEX管(guan)(guan)(guan)(guan)(guan)。c.使(shi)用(yong)壽命。UPVC管(guan)(guan)(guan)(guan)(guan)和(he)鋁(lv)塑(su)復(fu)合(he)(he)(he)管(guan)(guan)(guan)(guan)(guan)使(shi)用(yong)壽命約(yue)20~30年,PEX管(guan)(guan)(guan)(guan)(guan)約(yue)50年。d.抗化(hua)(hua)學(xue)腐蝕性(xing)能(neng)。由于(yu)PEX管(guan)(guan)(guan)(guan)(guan)其分(fen)子(zi)(zi)結(jie)(jie)構,即使(shi)處(chu)于(yu)高溫(wen)下也(ye)能(neng)輸(shu)送(song)多種化(hua)(hua)學(xue)物質(zhi)(zhi)(zhi),而不(bu)(bu)被(bei)腐蝕。e.良(liang)(liang)好的(de)(de)記(ji)憶性(xing)能(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)(guan)被(bei)加(jia)熱(re)到(dao)適當(dang)溫(wen)度(小于(yu)180℃)時會變成透(tou)明狀,再冷卻時會恢復(fu)到(dao)原(yuan)來的(de)(de)形狀,即在(zai)使(shi)用(yong)過(guo)程中(zhong)任何(he)錯誤的(de)(de)彎曲都(dou)可以(yi)(yi)通過(guo)熱(re)風槍加(jia)以(yi)(yi)矯正,使(shi)用(yong)起來更加(jia)自如。f.不(bu)(bu)結(jie)(jie)垢(gou)。水(shui)(shui)中(zhong)碳(tan)酸氫鈣(gai)及鎂離子(zi)(zi)的(de)(de)存在(zai)易形成沉淀物,慢(man)慢(man)使(shi)管(guan)(guan)(guan)(guan)(guan)道(dao)堵塞,而PEX管(guan)(guan)(guan)(guan)(guan)具有較(jiao)低的(de)(de)表(biao)面(mian)(mian)張(zhang)力以(yi)(yi)致(zhi)使(shi)高表(biao)面(mian)(mian)張(zhang)力的(de)(de)水(shui)(shui)不(bu)(bu)會被(bei)浸(jin)潤管(guan)(guan)(guan)(guan)(guan)壁,從而防(fang)(fang)止管(guan)(guan)(guan)(guan)(guan)內水(shui)(shui)垢(gou)的(de)(de)形成。g.環(huan)保性(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)是無污(wu)染(ran)環(huan)境(jing)的(de)(de)綠色(se)管(guan)(guan)(guan)(guan)(guan)材,不(bu)(bu)含(han)任何(he)毒素,也(ye)不(bu)(bu)釋放有害物質(zhi)(zhi)(zhi),焚(fen)燒后只產生(sheng)水(shui)(shui)和(he)二氧化(hua)(hua)碳(tan)。而UPVC管(guan)(guan)(guan)(guan)(guan)在(zai)生(sheng)產過(guo)程中(zhong)加(jia)入重金屬添加(jia)劑,同時本身殘存的(de)(de)單體氯乙烯在(zai)使(shi)用(yong)時一起進入輸(shu)送(song)的(de)(de)介(jie)質(zhi)(zhi)(zhi)中(zhong),易造成介(jie)質(zhi)(zhi)(zhi)污(wu)染(ran);鋁(lv)塑(su)復(fu)合(he)(he)(he)管(guan)(guan)(guan)(guan)(guan)由于(yu)中(zhong)間為鋁(lv)層(ceng),因(yin)鋁(lv)和(he)塑(su)料的(de)(de)膨(peng)脹(zhang)系數不(bu)(bu)一樣,易發生(sheng)龜裂現象,屬不(bu)(bu)可降解物質(zhi)(zhi)(zhi),其垃圾易造成環(huan)境(jing)污(wu)染(ran)。
3. PEX管的領域。
①. 室內給水(shui)管(guan)(guan)、熱水(shui)管(guan)(guan)、純凈水(shui)輸(shu)送(song)管(guan)(guan)。②. 食(shi)品中(zhong)液體食(shi)品輸(shu)送(song)管(guan)(guan)道。③. 水(shui)暖供熱系(xi)統(tong)、中(zhong)央空(kong)調管(guan)(guan)道系(xi)統(tong)、地面(mian)輻射采暖系(xi)統(tong)、太陽能(neng)熱水(shui)器系(xi)統(tong)等(deng)。④. 電(dian)(dian)信、電(dian)(dian)氣用配管(guan)(guan)。⑤. 電(dian)(dian)鍍(du)、石油、化工廠輸(shu)送(song)管(guan)(guan)道系(xi)統(tong)。
4. 交(jiao)聯聚(ju)乙(yi)烯PEX管(guan)的主要(yao)標準見(jian)表4.3.15。