橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)密(mi)(mi)封件(jian)是(shi)實現泵密(mi)(mi)封的(de)(de)(de)(de)(de)關鍵(jian)之(zhi)一。常見的(de)(de)(de)(de)(de)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)密(mi)(mi)封材(cai)料(liao)(liao)：三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)、丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)、硅(gui)(gui)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)和氟(fu)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)，它們有(you)(you)不(bu)同(tong)的(de)(de)(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)和用(yong)(yong)途。如何選(xuan)擇正確(que)的(de)(de)(de)(de)(de)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)密(mi)(mi)封材(cai)料(liao)(liao)，是(shi)保(bao)證產品(pin)質量的(de)(de)(de)(de)(de)關鍵(jian)之(zhi)一。下(xia)面先來(lai)介紹每種(zhong)材(cai)料(liao)(liao)的(de)(de)(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)。 三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)（英文(wen)簡(jian)稱(cheng)(cheng)EPDM）是(shi)目前(qian)飲用(yong)(yong)水(shui)輸送(song)系(xi)統中*常用(yong)(yong)的(de)(de)(de)(de)(de)一種(zhong)材(cai)料(liao)(liao)。三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙生膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)由(you)(you)乙烯(xi)(xi)、丙烯(xi)(xi)和*三(san)(san)(san)種(zhong)特(te)殊(shu)(shu)結(jie)構(gou)(gou)的(de)(de)(de)(de)(de)單(dan)體(ti)共聚反應合成。由(you)(you)于其(qi)分(fen)子(zi)主(zhu)鏈(lian)結(jie)構(gou)(gou)上沒有(you)(you)不(bu)飽和鍵(jian)，三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)具(ju)(ju)有(you)(you)優(you)(you)(you)異(yi)(yi)的(de)(de)(de)(de)(de)抗(kang)氧(yang)化(hua)(hua)、耐(nai)(nai)(nai)臭(chou)(chou)氧(yang)性(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)紫外線和耐(nai)(nai)(nai)熱性(xing)(xing)(xing)(xing)（即耐(nai)(nai)(nai)候性(xing)(xing)(xing)(xing)好）。同(tong)時，它還具(ju)(ju)有(you)(you)優(you)(you)(you)異(yi)(yi)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)水(shui)性(xing)(xing)(xing)(xing)和耐(nai)(nai)(nai)水(shui)蒸汽性(xing)(xing)(xing)(xing)。三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)(de)使(shi)用(yong)(yong)溫(wen)(wen)度(du)(du)范(fan)圍(wei)也很(hen)廣，一般地(di)說，它可以(yi)(yi)(yi)在-40℃到(dao)(dao)125℃之(zhi)間長期使(shi)用(yong)(yong)。特(te)殊(shu)(shu)的(de)(de)(de)(de)(de)配方可以(yi)(yi)(yi)將(jiang)(jiang)低溫(wen)(wen)性(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)降(jiang)到(dao)(dao)-55℃左右(you)；或者將(jiang)(jiang)高(gao)(gao)溫(wen)(wen)上限提(ti)高(gao)(gao)到(dao)(dao)150℃。值得注意(yi)的(de)(de)(de)(de)(de)是(shi)，三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)不(bu)耐(nai)(nai)(nai)脂(zhi)(zhi)肪烴和芳香烴等(deng)油(you)類。在有(you)(you)礦(kuang)物(wu)油(you)、汽油(you)、燃油(you)等(deng)環境下(xia)，三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)件(jian)會(hui)很(hen)快溶脹(zhang)，同(tong)時機械強度(du)(du)會(hui)大大降(jiang)低。所(suo)以(yi)(yi)(yi)，三(san)(san)(san)元(yuan)(yuan)(yuan)乙丙橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)件(jian)不(bu)能(neng)(neng)(neng)(neng)使(shi)用(yong)(yong)基于石油(you)的(de)(de)(de)(de)(de)潤滑油(you)。 丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)（英文(wen)簡(jian)稱(cheng)(cheng)NBR）在水(shui)輸送(song)系(xi)統中也很(hen)常見。這(zhe)類彈性(xing)(xing)(xing)(xing)體(ti)是(shi)由(you)(you)丁(ding)(ding)二(er)烯(xi)(xi)和丙烯(xi)(xi)腈(jing)(jing)共聚而成的(de)(de)(de)(de)(de)。一般地(di)說，丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)產品(pin)可以(yi)(yi)(yi)在-55℃到(dao)(dao)100℃之(zhi)間使(shi)用(yong)(yong)。當丙烯(xi)(xi)腈(jing)(jing)成分(fen)增(zeng)加(jia)時，該丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)產品(pin)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)熱性(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)油(you)性(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)磨性(xing)(xing)(xing)(xing)等(deng)都有(you)(you)提(ti)高(gao)(gao)，但(dan)其(qi)耐(nai)(nai)(nai)低溫(wen)(wen)性(xing)(xing)(xing)(xing)會(hui)下(xia)降(jiang)。丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)水(shui)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)好。一般在水(shui)輸送(song)系(xi)統中選(xuan)擇丁(ding)(ding)腈(jing)(jing)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)是(shi)因為橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)件(jian)在使(shi)用(yong)(yong)中可能(neng)(neng)(neng)(neng)會(hui)碰到(dao)(dao)礦(kuang)物(wu)油(you)等(deng)油(you)脂(zhi)(zhi)，比如污(wu)水(shui)處理等(deng)。 硅(gui)(gui)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)彈性(xing)(xing)(xing)(xing)體(ti)是(shi)由(you)(you)聚二(er)甲(jia)基硅(gui)(gui)氧(yang)烷合成的(de)(de)(de)(de)(de)。它具(ju)(ju)有(you)(you)優(you)(you)(you)異(yi)(yi)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)水(shui)性(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)候性(xing)(xing)(xing)(xing)、耐(nai)(nai)(nai)臭(chou)(chou)氧(yang)性(xing)(xing)(xing)(xing)等(deng)性(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)，同(tong)時還有(you)(you)氣味小、易加(jia)工成型(xing)等(deng)優(you)(you)(you)點。普通(tong)硅(gui)(gui)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)可以(yi)(yi)(yi)在-55℃到(dao)(dao)225℃之(zhi)間使(shi)用(yong)(yong)。硅(gui)(gui)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)(de)缺點是(shi)抗(kang)拉伸強度(du)(du)不(bu)好，抗(kang)撕(si)裂性(xing)(xing)(xing)(xing)和耐(nai)(nai)(nai)磨性(xing)(xing)(xing)(xing)也不(bu)好，價格也較高(gao)(gao)。 氟(fu)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)（英文(wen)簡(jian)稱(cheng)(cheng)FKM）種(zhong)類很(hen)多，但(dan)是(shi)它們在結(jie)構(gou)(gou)上都是(shi)在主(zhu)鏈(lian)或側鏈(lian)的(de)(de)(de)(de)(de)碳原(yuan)子(zi)上帶有(you)(you)氟(fu)原(yuan)子(zi)。氟(fu)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)具(ju)(ju)有(you)(you)高(gao)(gao)度(du)(du)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)熱性(xing)(xing)(xing)(xing)，優(you)(you)(you)良的(de)(de)(de)(de)(de)化(hua)(hua)學(xue)(xue)惰性(xing)(xing)(xing)(xing)（耐(nai)(nai)(nai)化(hua)(hua)學(xue)(xue)品(pin)、耐(nai)(nai)(nai)腐蝕、耐(nai)(nai)(nai)油(you)），很(hen)好的(de)(de)(de)(de)(de)物(wu)理機械性(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)（包括耐(nai)(nai)(nai)磨）以(yi)(yi)(yi)及優(you)(you)(you)異(yi)(yi)的(de)(de)(de)(de)(de)耐(nai)(nai)(nai)候性(xing)(xing)(xing)(xing)和抗(kang)老化(hua)(hua)性(xing)(xing)(xing)(xing)。通(tong)用(yong)(yong)型(xing)的(de)(de)(de)(de)(de)氟(fu)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)產品(pin)一般可以(yi)(yi)(yi)在-25℃到(dao)(dao)200℃之(zhi)間使(shi)用(yong)(yong)。在水(shui)輸送(song)系(xi)統中，氟(fu)橡(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)(de)主(zhu)要缺點是(shi)價格太高(gao)(gao)。