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</table> <div id="qwcagsgoaso" class="text-more" contextmenu="return false" unselectable="on">  <div> <p>通常我們所說(shuō)的天然橡膠，是指從巴西橡膠樹(shù)上采集的天然膠乳，經(jīng)過(guò)凝固、干燥等加工工序而制成的彈性固狀物。天然橡膠是一種以順-1，4-聚異戊二烯為主要成分的天然高分子化合物，分子式是（C5H8）n，其橡膠烴（順-1，4-聚異戊二烯）含量在90%以上，還含有少量的蛋白質(zhì)、脂肪酸、糖分及灰分等。<br /> 天然橡膠的物理特性。天然橡膠在常溫下具有較高的彈性，稍帶塑性，具有非常好的機械強度，滯后損失小，在多次變形時(shí)生熱低，因此其耐屈撓性也很好，并且因為是非極性橡膠，所以電絕緣性能良好。<br /> 天然橡膠的化學(xué)特性。因為有不飽和雙鍵，所以天然橡膠是一種化學(xué)反應能力較強的物質(zhì)，光、熱、臭氧、輻射、屈撓變形和銅、錳等金屬都能促進(jìn)橡膠的老化，不耐老化是天然橡膠的致命弱點(diǎn)，但是，添加了防老劑的天然橡膠，有時(shí)在陽(yáng)光下曝曬兩個(gè)月依然看不出多大變化，在倉庫內貯存三年后仍可以照常使用。<br /> 天然橡膠的耐介質(zhì)特性。天然橡膠有較好的耐堿性能，但不耐濃強酸。由于天然橡膠是非極性橡膠，只能耐一些極性溶劑，而在非極性溶劑中則溶脹，因此，其耐油性和耐溶劑性很差，一般說(shuō)來(lái)，烴、鹵代烴、二硫化碳、醚、酮和脂肪酸對天然橡膠均有溶解作用，但其溶解度則受塑煉程度的影響，而低級酮、低級酯及醇類(lèi)對天然橡膠則是非溶劑。<br/><img src="http://jmage0.huangye88.net/live/2022/04/19/79159001e7d6010da7c25fcf1a7351d4.jpg@750w_750h_90Q" /><br/>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/ac1d1b852567746b59bac2dbb8d0f402.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)。</p> </div> <div id="qwcagsgoaso" class="pages"> <span id="qwcagsgoaso" class="leftpage"><font>上一條 </font><a href="http://m.guizhouboda.com/ershouhuishou/88-9b31ibndo4e874.html" target="_blank" title="六盤(pán)水庫存積壓廢油回收多少錢(qián)一噸植物油">六盤(pán)水庫存積壓廢油回收多少錢(qián)一噸植物油</a></span> <span id="qwcagsgoaso" class="rightpage"><font> 下一條</font><a href="http://m.guizhouboda.com/ershouhuishou/88-522lc28gf2b7c0.html" target="_blank" title="呼倫貝爾包裝破損廢油回收高價(jià)求購導熱油回收">呼倫貝爾包裝破損廢油回收高價(jià)求購導熱油回收</a></span> </div> </div> </div> </div> </div> <div id="qwcagsgoaso" class="list"> <h2 class="titles" style="float:left;">進(jìn)口塑料顆?；厥障嚓P(guān)信息</h2> <a class="r-more" rel="nofollow" target="_blank" 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