高分子密封膠是用來填充孔洞、接(jie)(jie)縫(feng)等(deng)間隙的(de)(de)膏(gao)狀材(cai)(cai)(cai)料(liao)(liao)。當(dang)其(qi)(qi)固化后(hou),即(ji)同(tong)(tong)被填補(bu)的(de)(de)基材(cai)(cai)(cai)連成整體,具有防(fang)(fang)(fang)水(shui)、防(fang)(fang)(fang)塵、防(fang)(fang)(fang)風、防(fang)(fang)(fang)震(zhen)等(deng)作用,它(ta)主(zhu)要用于交通運輸與(yu)土木建筑等(deng)方面。高分子密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)品種(zhong)甚(shen)多,大(da)(da)致可(ke)以分成彈(dan)(dan)(dan)性(xing)(xing)(xing)與(yu)非(fei)彈(dan)(dan)(dan)性(xing)(xing)(xing)兩大(da)(da)類。非(fei)彈(dan)(dan)(dan)性(xing)(xing)(xing)型密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)有酚(fen)醛、環氧、不飽和聚酯(zhi)(zhi)(zhi)(zhi)等(deng)類密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao);彈(dan)(dan)(dan)性(xing)(xing)(xing)型密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)則有聚氨酯(zhi)(zhi)(zhi)(zhi)、有機硅(gui)、聚硫橡膠(jiao)(jiao)、天然橡膠(jiao)(jiao)、氯丁(ding)橡膠(jiao)(jiao)、丁(ding)基橡膠(jiao)(jiao)等(deng)類密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)。彈(dan)(dan)(dan)性(xing)(xing)(xing)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)能(neng)(neng)(neng)(neng)經受接(jie)(jie)縫(feng)內一(yi)定限度(du)的(de)(de)伸縮運動,具有粘接(jie)(jie)與(yu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)雙重功能(neng)(neng)(neng)(neng),目(mu)前已成為(wei)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料(liao)(liao)的(de)(de)主(zhu)體。在(zai)(zai)上(shang)述的(de)(de)彈(dan)(dan)(dan)性(xing)(xing)(xing)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)中,聚氨酯(zhi)(zhi)(zhi)(zhi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)彈(dan)(dan)(dan)性(xing)(xing)(xing)與(yu)耐低溫(wen)性(xing)(xing)(xing)尤(you)為(wei)突(tu)出,且(qie)其(qi)(qi)耐磨(mo)、耐水(shui)、耐油、耐生物降解性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)亦良好,與(yu)基材(cai)(cai)(cai)的(de)(de)粘接(jie)(jie)性(xing)(xing)(xing)高,使(shi)用壽命長,撕裂強(qiang)度(du)大(da)(da),而(er)(er)且(qie)此類密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)還能(neng)(neng)(neng)(neng)隨(sui)原材(cai)(cai)(cai)料(liao)(liao)組(zu)分與(yu)配制方法不同(tong)(tong),可(ke)在(zai)(zai)寬廣范圍內調(diao)節,從而(er)(er)滿足諸多密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)場合需要。聚氨酯(zhi)(zhi)(zhi)(zhi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)發展(zhan)現狀聚氨酯(zhi)(zhi)(zhi)(zhi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)開發研究始(shi)于20世紀(ji)50年代末(mo)期,20世紀(ji)70年代初(chu)在(zai)(zai)發達國家始(shi)有商品出售。此類密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)因為(wei)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)優越(yue)、使(shi)用范圍寬闊、施工簡便,所(suo)以其(qi)(qi)發展(zhan)較快。闡述了蓖麻(ma)油型聚氨酯(zhi)(zhi)(zhi)(zhi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)與(yu)發展(zhan)現狀,分析了各(ge)種(zhong)組(zu)分對密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)的(de)(de)影響,并預測了此種(zhong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)膠(jiao)(jiao)的(de)(de)發展(zhan)方向。

機械(xie)器件的(de)生產使用過程中(zhong)，最先使用的(de)密封材(cai)料是固(gu)體(ti)(ti)墊片(pian)，但是效(xiao)果(guo)卻顯一般，密封效(xiao)果(guo)不是很好。硅酮(tong)密封膠的(de)出現，代(dai)替了固(gu)體(ti)(ti)墊片(pian)，為器件提供了密封的(de)效(xiao)果(guo)。那么，硅酮(tong)密封膠與固(gu)體(ti)(ti)墊片(pian)哪個更好呢？

泄漏(lou)是指機(ji)械(xie)設備內部(bu)的(de)工(gong)作介質(zhi)（如潤滑油等(deng)）泄漏(lou)到設備外部(bu)，或是機(ji)械(xie)設備外部(bu)環境中的(de)礦粒(li)、塵埃、水分(fen)等(deng)雜質(zhi)侵入設備內部(bu)，硅酮密封膠致力于解決機(ji)械(xie)設備的(de)漏(lou)油問題，且硅酮密封膠具有超(chao)強(qiang)的(de)耐油特性(xing)，即(ji)使長期(qi)處在油浸的(de)腐(fu)蝕狀態下，依然可以(yi)保持穩定性(xing)。

密(mi)(mi)封(feng)是(shi)防(fang)止機械(xie)設備泄漏的措施。硅酮密(mi)(mi)封(feng)膠是(shi)一種用于防(fang)止機械(xie)設備泄漏的膠粘劑，它廣(guang)泛應用于機械(xie)設備的靜密(mi)(mi)封(feng)。在(zai)兩(liang)密(mi)(mi)封(feng)面間加入(ru)固體墊(dian)圈(片) 是(shi)傳統的靜密(mi)(mi)封(feng)方法。

硅(gui)(gui)酮(tong)密(mi)封(feng)(feng)膠是根據性能(neng)(neng)要求添加上各種填(tian)料(liao)和輔助料(liao)配(pei)制而成。將硅(gui)(gui)酮(tong)密(mi)封(feng)(feng)膠涂在(zai)接觸面，膠液即可填(tian)充(chong)凹凸的不平接觸表面，硅(gui)(gui)酮(tong)密(mi)封(feng)(feng)膠固化后便形成連續的、能(neng)(neng)承受一定(ding)壓(ya)力的粘彈(dan)性膠層，具有(you)密(mi)封(feng)(feng)作(zuo)用。

硅(gui)酮(tong)結構密封(feng)膠相(xiang)比(bi)固體墊片有更多的(de)優點。如耐壓密封(feng)性好(hao)(hao)、涂敷簡單方便、使用溫(wen)度范(fan)圍廣(guang)、生產成(cheng)本低、外形美觀(guan)、可(ke)自由成(cheng)形、可(ke)減(jian)輕構件重(zhong)量(liang)等等。如果硅(gui)酮(tong)密封(feng)膠與固體墊片能同時(shi)使用，密封(feng)性能會更好(hao)(hao)。