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<div id="qwcagsgoaso" class="text-more" contextmenu="return false" unselectable="on">  <div> <p>偶聯(lián)劑早由美國聯(lián)合碳化物公司（UCC）為發(fā)展玻璃纖維增強塑料而開(kāi)發(fā)。早在40年代，當玻璃纖維用作有機樹(shù)脂的增強材料，制備廣泛使用的玻璃鋼時(shí)，發(fā)現當它們長(cháng)期置于潮氣中，其強度會(huì )因為樹(shù)脂與親水性的玻璃纖維脫粘而明顯下降，進(jìn)而不能得到耐水復合材料。鑒于含有官能團的有機硅材料是同時(shí)與二氧化硅（即玻璃纖維的主要成分）和樹(shù)脂有兩親關(guān)系的有機材料及無(wú)機材料的“雜交”體，試用它作為“粘合劑”或偶聯(lián)劑，來(lái)改善有機樹(shù)脂與無(wú)機表面的粘接，以達到改善聚合物性能的目的，就成為科技工作者的一大設想，并在實(shí)際應用中取得了較好的效果。因此自40年代初至60年代是偶聯(lián)劑產(chǎn)生和發(fā)展時(shí)期，并形成了代硅烷類(lèi)偶聯(lián)劑。工業(yè)上使用偶聯(lián)劑按照化學(xué)結構分類(lèi)可分為：硅烷類(lèi)，鈦酸酯類(lèi)，鋁酸酯類(lèi)，有機鉻洛合物，硼化物，磷酸酯，鋯酸酯，錫酸酯等。它們廣泛地應用在塑料橡膠等高分子材料領(lǐng)域之中。<br/><img src="http://jmage0.huangye88.net/live/2022/04/19/79159001e7d6010da7c25fcf1a7351d4.jpg@750w_750h_90Q" /><br/>石蠟是從石油、頁(yè)巖油或其他瀝青礦物油的某些餾出物中提取出來(lái)的一種烴類(lèi)混合物，主要成分是固體烷烴，無(wú)臭無(wú)味，為白色或淡黃色半透明固體。石蠟是非晶體，但具有明顯的晶體結構。另有人造石蠟。<br /> 石蠟是石油加工產(chǎn)品的一種，是礦物蠟的一種，也是石油蠟的一種。它是從原油蒸餾所得的潤滑油餾分經(jīng)溶劑精制、溶劑脫蠟或經(jīng)蠟冷凍結晶、壓榨脫蠟制得蠟膏，再經(jīng)溶劑脫油、精制而得的片狀或針狀結晶。用于制脂肪酸、醇、火柴、蠟燭、防水劑、軟膏、電絕緣材料等。<br /> 石蠟分食品級（食品級和包裝級，前者優(yōu)）和工業(yè)級，食品級，工業(yè)級不可食用。<br /> 石蠟制品在造型或涂敷過(guò)程中，長(cháng)期處于熱熔狀態(tài)，并與空氣接觸，假如安定性不好，就容易氧化變質(zhì)、顏色變深，甚至發(fā)出臭味。此外，使用時(shí)處于光照條件下石蠟也會(huì )變黃。因此，要求石蠟具有良好的熱安定性、氧化安定性和光安定性。<br /> 影響石蠟安定性的主要因素是其所含有的微量的非烴化合物和稠環(huán)芳烴。為提高石蠟的安定性，就需要對石蠟進(jìn)行深度精制，以脫除這些雜質(zhì)。<br/><img src="http://jmage0.huangye88.net/live/2022/04/18/b5580f7614f78ac28571482a4c515728.jpg@750w_750h_90Q" /><br/>半精煉石蠟既是一種重要的石油產(chǎn)品，也是一種廣泛用于各行業(yè)并與廣大人民群眾生活息息相關(guān)的重要物質(zhì)。近年來(lái)中國一直是全球大的石蠟生產(chǎn)國和全球大的石蠟出口國也是大的石蠟消費國之一。國內有眾多的企業(yè)生產(chǎn)和應用石蠟油類(lèi)產(chǎn)品，關(guān)心石蠟產(chǎn)品的人士更是遍布各行各業(yè)。<br /> 國內生產(chǎn)的石蠟產(chǎn)品按品種分類(lèi)，包括全精煉石蠟，半精煉石蠟，食品用及食品加工用石蠟，微晶蠟，凡士林以及各種蠟，特種蠟，如汽車(chē)用蠟，電子工業(yè)用蠟，橡膠防護蠟，感溫蠟，氧化微晶蠟，蠟基熱熔膠，炸藥工業(yè)用蠟等。<br /> 我國含蠟原油品種多,石油蠟資源豐富.據統計,2005年成品石蠟的產(chǎn)量已經(jīng)達到154*104t,其產(chǎn)量和出口量分別達到世界總產(chǎn)量的37%和47%,成為世界上石蠟生產(chǎn)和出口量的大國.盡管我國石蠟產(chǎn)量大,但是,產(chǎn)品結構不盡合理,高附加價(jià)值的特種蠟產(chǎn)品的產(chǎn)量很低,僅占石蠟產(chǎn)量的0.5%左右,大大低于石蠟總產(chǎn)量93*104t/a,特種蠟和蠟產(chǎn)品占總產(chǎn)量30%的美國.我國的石蠟的應用范圍,也影響了石蠟生產(chǎn)企業(yè)的經(jīng)濟效益.因此,在我國大力研發(fā),生產(chǎn)和推廣應用特種蠟產(chǎn)品是充分利用寶貴的石蠟資源,滿(mǎn)足國內外市場(chǎng)需求,增加企業(yè)經(jīng)濟效益發(fā)展方向.</p> </div> <div id="qwcagsgoaso" class="pages"> <span id="qwcagsgoaso" class="leftpage"><font>上一條 </font><a href="http://m.guizhouboda.com/ershouhuishou/88-bd1fjdk94f249e.html" target="_blank" title="河池進(jìn)口回收過(guò)期食品高價(jià)收購,過(guò)期食品收購">河池進(jìn)口回收過(guò)期食品高價(jià)收購,過(guò)期食品收購</a></span> <span id="qwcagsgoaso" class="rightpage"><font> 下一條</font><a href="http://m.guizhouboda.com/ershouhuishou/88-563b3mlkqb89ba.html" target="_blank" title="半桶半箱回收過(guò)期食品大量回收,食品過(guò)期回收">半桶半箱回收過(guò)期食品大量回收,食品過(guò)期回收</a></span> </div> </div> </div> </div> </div> <div id="qwcagsgoaso" 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