通(tong)常我們所(suo)說的(de)(de)(de)(de)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)是(shi)指天(tian)然橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)，它(ta)從橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)樹上(shang)(shang)采集的(de)(de)(de)(de)天(tian)然膠(jiao)(jiao)(jiao)(jiao)乳(ru)，經凝(ning)固、干燥等(deng)(deng)加工(gong)工(gong)序制成的(de)(de)(de)(de)固狀(zhuang)物。天(tian)然橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)是(shi)一種(zhong)(zhong)以(yi)聚異戊二(er)烯為主要(yao)成分(fen)(fen)(fen)(fen)的(de)(de)(de)(de)天(tian)然高分(fen)(fen)(fen)(fen)子(zi)化合(he)物，分(fen)(fen)(fen)(fen)子(zi)式是(shi)（C5H8）n，其(qi)橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)烴（聚異戊二(er)烯）含量(liang)在(zai)90以(yi)上(shang)(shang)，還(huan)含有少(shao)量(liang)的(de)(de)(de)(de)蛋白質、脂肪(fang)酸、糖份及(ji)灰份等(deng)(deng)。 天(tian)然橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)在(zai)常溫下(xia)具(ju)有較(jiao)高的(de)(de)(de)(de)彈(dan)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)，稍帶(dai)塑(su)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)，具(ju)有非常好(hao)(hao)的(de)(de)(de)(de)機(ji)械(xie)強(qiang)度(du)，滯后損失(shi)小，在(zai)多次變形時生熱低(di)，因此(ci)其(qi)耐(nai)(nai)(nai)(nai)屈撓(nao)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)也(ye)很好(hao)(hao)，并(bing)且因為是(shi)非極(ji)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)，所(suo)以(yi)電絕緣(yuan)(yuan)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)良好(hao)(hao)。 而(er)目前市面(mian)上(shang)(shang)大(da)多數橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)密(mi)(mi)封(feng)(feng)(feng)(feng)圈(quan)屬(shu)于合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)，它(ta)同塑(su)料、纖維并(bing)稱為三(san)大(da)合(he)成材(cai)料，具(ju)有高度(du)伸(shen)縮性(xing)(xing)(xing)(xing)(xing)(xing)(xing)與(yu)極(ji)好(hao)(hao)彈(dan)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)高分(fen)(fen)(fen)(fen)子(zi)材(cai)料。合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)特(te)征首先是(shi)彈(dan)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)模量(liang)非常小，而(er)伸(shen)長率很高。其(qi)次是(shi)它(ta)具(ju)有相當好(hao)(hao)的(de)(de)(de)(de)耐(nai)(nai)(nai)(nai)透氣性(xing)(xing)(xing)(xing)(xing)(xing)(xing)以(yi)及(ji)耐(nai)(nai)(nai)(nai)各(ge)種(zhong)(zhong)化學介質和(he)電絕緣(yuan)(yuan)的(de)(de)(de)(de)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)。某些特(te)種(zhong)(zhong)合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)更具(ju)備良好(hao)(hao)的(de)(de)(de)(de)耐(nai)(nai)(nai)(nai)油性(xing)(xing)(xing)(xing)(xing)(xing)(xing)及(ji)耐(nai)(nai)(nai)(nai)溫性(xing)(xing)(xing)(xing)(xing)(xing)(xing)，能(neng)抵抗脂肪(fang)油、潤滑油、液壓油、燃料油以(yi)及(ji)溶(rong)劑油的(de)(de)(de)(de)溶(rong)脹；耐(nai)(nai)(nai)(nai)寒可低(di)到－60℃至－80℃，耐(nai)(nai)(nai)(nai)熱可高到 180℃至 350℃。合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)還(huan)耐(nai)(nai)(nai)(nai)各(ge)種(zhong)(zhong)曲(qu)撓(nao)、彎曲(qu)變形，因為滯后損失(shi)小。合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)第三(san)個特(te)征在(zai)于它(ta)能(neng)與(yu)多種(zhong)(zhong)材(cai)料進行并(bing)用(yong)(yong)(yong)、共混、復合(he)，由此(ci)進行改性(xing)(xing)(xing)(xing)(xing)(xing)(xing)，以(yi)得(de)到良好(hao)(hao)的(de)(de)(de)(de)綜(zong)合(he)性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)。合(he)成橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)的(de)(de)(de)(de)這(zhe)些基本性(xing)(xing)(xing)(xing)(xing)(xing)(xing)能(neng)，使它(ta)成為工(gong)業上(shang)(shang)極(ji)好(hao)(hao)的(de)(de)(de)(de)減震、密(mi)(mi)封(feng)(feng)(feng)(feng)、屈撓(nao)、耐(nai)(nai)(nai)(nai)磨、防(fang)腐(fu)、絕緣(yuan)(yuan)以(yi)及(ji)粘接等(deng)(deng)材(cai)料。而(er)是(shi)防(fang)止(zhi)(zhi)流體或固體微粒從相鄰結合(he)面(mian)間泄(xie)漏以(yi)及(ji)防(fang)止(zhi)(zhi)外界(jie)雜(za)質如(ru)灰塵(chen)與(yu)水(shui)分(fen)(fen)(fen)(fen)等(deng)(deng)侵入機(ji)器設備內部的(de)(de)(de)(de)零部件的(de)(de)(de)(de)材(cai)料或零件。 用(yong)(yong)(yong)途分(fen)(fen)(fen)(fen)類(lei) 1.按作用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)類(lei):分(fen)(fen)(fen)(fen)為軸用(yong)(yong)(yong)密(mi)(mi)封(feng)(feng)(feng)(feng)、孔用(yong)(yong)(yong)密(mi)(mi)封(feng)(feng)(feng)(feng)、防(fang)塵(chen)密(mi)(mi)封(feng)(feng)(feng)(feng)、導(dao)向環(huan)、固定密(mi)(mi)封(feng)(feng)(feng)(feng)、回(hui)轉密(mi)(mi)封(feng)(feng)(feng)(feng)。 2.按材(cai)料分(fen)(fen)(fen)(fen)類(lei):分(fen)(fen)(fen)(fen)為丁腈(jing)膠(jiao)(jiao)(jiao)(jiao)、三(san)元乙(yi)丙橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)、氟(fu)橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)、硅膠(jiao)(jiao)(jiao)(jiao)、氟(fu)硅橡(xiang)(xiang)(xiang)(xiang)膠(jiao)(jiao)(jiao)(jiao)等(deng)(deng)。

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