1. 生產PEX管(guan)(guan)(guan)的(de)(de)(de)主要原(yuan)(yuan)料(liao)是HDPE以(yi)及(ji)引發劑(ji)、交(jiao)(jiao)聯(lian)劑(ji)、催(cui)化(hua)劑(ji)等助劑(ji),如有(you)特殊要求還可(ke)以(yi)添(tian)加其他改質(zhi)劑(ji)。PEX管(guan)(guan)(guan)采用(yong)(yong)世界(jie)上先進(jin)的(de)(de)(de)一步法(MONSOIL法)技術制造(zao),采用(yong)(yong)普通聚(ju)(ju)乙(yi)烯原(yuan)(yuan)料(liao)加入硅烷接枝料(liao),在聚(ju)(ju)合物大分子(zi)鏈間形(xing)成化(hua)學共價(jia)鍵以(yi)取代原(yuan)(yuan)有(you)的(de)(de)(de)范德華力,從而形(xing)成三維交(jiao)(jiao)鏈網狀(zhuang)結構的(de)(de)(de)交(jiao)(jiao)聯(lian)聚(ju)(ju)乙(yi)烯,其交(jiao)(jiao)聯(lian)度可(ke)達60%~89%,使其具有(you)優良(liang)的(de)(de)(de)理化(hua)性(xing)能。PEX 管(guan)(guan)(guan)交(jiao)(jiao)聯(lian)劑(ji)(添(tian)加劑(ji))是對(dui)其原(yuan)(yuan)線型分子(zi)結構起(qi)裂解作用(yong)(yong)形(xing)成接枝料(liao),進(jin)而形(xing)成三維網狀(zhuang)結構。抗氧劑(ji)及(ji)色粒的(de)(de)(de)作用(yong)(yong)是提(ti)高PEX管(guan)(guan)(guan)的(de)(de)(de)耐腐性(xing),防止日光長(chang)期照(zhao)射(she)發生物性(xing)變化(hua),能夠抵御紫外線的(de)(de)(de)長(chang)期侵蝕,從而延長(chang)其使用(yong)(yong)壽命。


  2. PEX管的(de)性能和(he)特(te)點。


    ①. PEX管與鍍鋅(xin)鋼管的性能比(bi)較(jiao)見表4.3.14。


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    ②. PEX管(guan)(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)(guan)、鋁(lv)(lv)(lv)塑(su)復(fu)合(he)管(guan)(guan)(guan)(guan)(guan)性(xing)(xing)(xing)能(neng)異同(tong)點(dian)。從性(xing)(xing)(xing)能(neng)上看,三(san)種(zhong)管(guan)(guan)(guan)(guan)(guan)材除(chu)具有(you)不(bu)銹(xiu)蝕(shi)、不(bu)結垢、不(bu)滋生(sheng)細菌(jun)和(he)安裝簡便等共性(xing)(xing)(xing)外,還有(you)一些(xie)區別:a.優良(liang)的(de)(de)(de)(de)耐溫(wen)性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)度(du)(du)為(wei)-70~110℃,UPVC管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)度(du)(du)為(wei)5~45℃,鋁(lv)(lv)(lv)塑(su)復(fu)合(he)管(guan)(guan)(guan)(guan)(guan)使(shi)用溫(wen)度(du)(du)為(wei)-40~85℃。b.防(fang)振(zhen)性(xing)(xing)(xing)能(neng)。UPVC管(guan)(guan)(guan)(guan)(guan)由于采用膠(jiao)水(shui)(shui)粘(zhan)接,防(fang)振(zhen)性(xing)(xing)(xing)能(neng)略遜色于鋁(lv)(lv)(lv)塑(su)復(fu)合(he)管(guan)(guan)(guan)(guan)(guan)和(he)PEX管(guan)(guan)(guan)(guan)(guan)。c.使(shi)用壽命。UPVC管(guan)(guan)(guan)(guan)(guan)和(he)鋁(lv)(lv)(lv)塑(su)復(fu)合(he)管(guan)(guan)(guan)(guan)(guan)使(shi)用壽命約20~30年(nian),PEX管(guan)(guan)(guan)(guan)(guan)約50年(nian)。d.抗(kang)化學(xue)腐(fu)蝕(shi)性(xing)(xing)(xing)能(neng)。由于PEX管(guan)(guan)(guan)(guan)(guan)其分子結構,即使(shi)處于高溫(wen)下也能(neng)輸送(song)多種(zhong)化學(xue)物(wu)質(zhi),而不(bu)被(bei)腐(fu)蝕(shi)。e.良(liang)好(hao)的(de)(de)(de)(de)記(ji)憶性(xing)(xing)(xing)能(neng)。當(dang)PEX管(guan)(guan)(guan)(guan)(guan)被(bei)加(jia)熱(re)到適當(dang)溫(wen)度(du)(du)(小于180℃)時會變成透明(ming)狀(zhuang),再冷卻(que)時會恢復(fu)到原(yuan)來的(de)(de)(de)(de)形狀(zhuang),即在(zai)使(shi)用過程(cheng)中任(ren)(ren)何錯誤的(de)(de)(de)(de)彎曲都可(ke)以通(tong)過熱(re)風(feng)槍(qiang)加(jia)以矯正,使(shi)用起來更(geng)加(jia)自(zi)如。f.不(bu)結垢。水(shui)(shui)中碳酸氫鈣及鎂離子的(de)(de)(de)(de)存在(zai)易(yi)形成沉淀(dian)物(wu),慢(man)慢(man)使(shi)管(guan)(guan)(guan)(guan)(guan)道堵塞(sai),而PEX管(guan)(guan)(guan)(guan)(guan)具有(you)較低的(de)(de)(de)(de)表(biao)面張(zhang)力(li)以致使(shi)高表(biao)面張(zhang)力(li)的(de)(de)(de)(de)水(shui)(shui)不(bu)會被(bei)浸潤管(guan)(guan)(guan)(guan)(guan)壁,從而防(fang)止(zhi)管(guan)(guan)(guan)(guan)(guan)內水(shui)(shui)垢的(de)(de)(de)(de)形成。g.環保性(xing)(xing)(xing)能(neng)。PEX管(guan)(guan)(guan)(guan)(guan)是無(wu)污(wu)染環境的(de)(de)(de)(de)綠色管(guan)(guan)(guan)(guan)(guan)材,不(bu)含任(ren)(ren)何毒素,也不(bu)釋放有(you)害物(wu)質(zhi),焚燒后(hou)只產生(sheng)水(shui)(shui)和(he)二氧化碳。而UPVC管(guan)(guan)(guan)(guan)(guan)在(zai)生(sheng)產過程(cheng)中加(jia)入重(zhong)金屬添加(jia)劑(ji),同(tong)時本身殘存的(de)(de)(de)(de)單體氯乙烯(xi)在(zai)使(shi)用時一起進入輸送(song)的(de)(de)(de)(de)介質(zhi)中,易(yi)造(zao)(zao)成介質(zhi)污(wu)染;鋁(lv)(lv)(lv)塑(su)復(fu)合(he)管(guan)(guan)(guan)(guan)(guan)由于中間為(wei)鋁(lv)(lv)(lv)層,因(yin)鋁(lv)(lv)(lv)和(he)塑(su)料的(de)(de)(de)(de)膨脹系(xi)數不(bu)一樣,易(yi)發生(sheng)龜裂現(xian)象,屬不(bu)可(ke)降解物(wu)質(zhi),其垃圾易(yi)造(zao)(zao)成環境污(wu)染。


  3. PEX管的領域。


    ①. 室內給水(shui)管(guan)(guan)(guan)(guan)(guan)、熱(re)水(shui)管(guan)(guan)(guan)(guan)(guan)、純(chun)凈水(shui)輸(shu)送(song)管(guan)(guan)(guan)(guan)(guan)。②. 食品中(zhong)液體食品輸(shu)送(song)管(guan)(guan)(guan)(guan)(guan)道。③. 水(shui)暖供熱(re)系(xi)統(tong)、中(zhong)央空調管(guan)(guan)(guan)(guan)(guan)道系(xi)統(tong)、地(di)面輻射采暖系(xi)統(tong)、太陽(yang)能熱(re)水(shui)器系(xi)統(tong)等。④. 電信、電氣用配管(guan)(guan)(guan)(guan)(guan)。⑤. 電鍍、石油、化工廠輸(shu)送(song)管(guan)(guan)(guan)(guan)(guan)道系(xi)統(tong)。


4. 交聯聚乙烯(xi)PEX管(guan)的主要(yao)標準見表4.3.15。


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