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class="attribute-value"><div>全國</div></td> </tr> </table> <div id="qwcagsgoaso" class="text-more" contextmenu="return false" unselectable="on">  <div> <p>1910-1911年，前蘇聯(lián)用堿金屬引發(fā)丁二烯聚合得到橡膠狀物質(zhì)。20世紀30年代初，德國和前蘇聯(lián)開(kāi)始生產(chǎn)以金屬鈉為催化劑的丁二烯橡膠，稱(chēng)為丁鈉橡膠，其結構規整性差，物性和加工性能不好，還不能算做順丁橡膠。20世紀50年代，Ziegler-Natta配位定向聚合理論的實(shí)踐，促進(jìn)了順丁橡膠合成技術(shù)的迅速發(fā)展。1956年，美國以AlR3-TiBr4催化體系合成順丁橡膠。隨后鈷系、鎳系及稀土系（釹系）催化劑相續發(fā)展，順丁橡膠生產(chǎn)能力已僅次于丁苯橡膠，合成橡膠各膠種第二位。2013年世界合成橡膠生產(chǎn)者協(xié)會(huì )統計丁二烯橡膠（主要為順丁橡膠）產(chǎn)能為471.8萬(wàn)噸/年。<br /> 我國在上世紀70年代采用自主開(kāi)發(fā)的技術(shù)實(shí)現了順丁橡膠工業(yè)化生產(chǎn)，采用的是鎳系催化劑，其生產(chǎn)技術(shù)一直處于世界水平行列。中國石化、中國石油和一些民企均擁有鎳系順丁橡膠生產(chǎn)裝置，2011年總產(chǎn)能達66萬(wàn)噸/年，產(chǎn)品銷(xiāo)往。未來(lái)幾年，我國鎳系順丁橡膠產(chǎn)能將進(jìn)一步擴大，預計我國鎳系順丁橡膠產(chǎn)能將超過(guò)100萬(wàn)噸/年。 <br /> 稀土順丁橡膠因其的性能被視為鎳系順丁橡膠的升級品種，逐漸被工業(yè)界所重視。稀土順丁橡膠與鎳系順丁橡膠相比具有較高的彈性、較好的拉伸性能、較低的生熱和滾動(dòng)阻力以及的耐磨耗和抗疲勞等物理機械性能，符合輪胎在高速、節能、安全、環(huán)保等方面發(fā)展的需要，常用于綠色輪胎。中國早在上世紀60年代就開(kāi)始了稀土催化丁二烯聚合的研究，由于當時(shí)經(jīng)濟發(fā)展落后，未能實(shí)現工業(yè)化生產(chǎn)。1998年在國家863計劃的支持下，中國石油錦州石化公司在鎳系萬(wàn)噸級順丁橡膠生產(chǎn)裝置上成功地生產(chǎn)出了稀土順丁橡膠。2011年，中國石油山子石化公司稀土順丁橡膠生產(chǎn)裝置投產(chǎn)，中國稀土順丁橡膠生產(chǎn)裝置實(shí)現了零突破。2012年，中國石化北京燕山分公司3萬(wàn)噸/年稀土順丁橡膠生產(chǎn)裝置也投產(chǎn)。未來(lái)幾年，我國將新增20多萬(wàn)噸/年稀土順丁橡膠的產(chǎn)能，屆時(shí)中國稀土順丁橡膠總產(chǎn)能達30萬(wàn)噸/年以上，成為稀土順丁橡膠大生產(chǎn)大國。<br/><img src="http://jmage0.huangye88.net/live/2022/04/18/b5580f7614f78ac28571482a4c515728.jpg@750w_750h_90Q" /><br/>泡沫的研究早可以追溯到柏拉圖時(shí)代，但幾來(lái)，人們對泡沫的定義一直沒(méi)有形成統一的認識。美國膠體化學(xué)家L·I·Osipow和道康寧公司的R·F·Smith從泡沫的密度方面對泡沫進(jìn)行了定義；日本的伊藤光一從泡沫結構的角度對泡沫進(jìn)行了定義，但是卻忽略了氣泡間的相互聯(lián)系；我國的表面物理學(xué)家趙國璽教授對泡沫的定義為：泡沫是氣體分散于液體中的分散體系，氣體是分散相（不連續相），液體是分散介質(zhì)（連續相），液體中的氣泡上升至液面，形成少量液體構成的以液膜隔開(kāi)氣體的氣泡聚集物。國內外學(xué)者一致認為：泡沫本身是一種熱力學(xué)不穩定體系，當氣體進(jìn)入含有表面活性劑的溶液中時(shí)，便會(huì )形成長(cháng)時(shí)間穩定的泡沫體系。 <br /> 生產(chǎn)方法一：纖維素是世界上蘊藏量豐富的天然高分子化合物，生產(chǎn)原料來(lái)源于木材、棉花、棉短絨、麥草、稻草、蘆葦、麻、桑皮、楮皮和甘蔗渣等。我國由于森林資源不足，纖維素的原料有70%來(lái)源于非木材資源。我國針葉材、闊葉材的纖維素平均含量約43-45%；草類(lèi)莖稈的纖維素平均含量在40%左右。纖維素的工業(yè)制法是用亞硫酸鹽溶液或堿溶液蒸煮植物原料，主要是除去木素，分別稱(chēng)為亞硫酸鹽法和堿法。得到的物料稱(chēng)為亞硫酸鹽漿和堿法漿。然后經(jīng)過(guò)漂白進(jìn)一步除去殘留木素，所得漂白漿可用于造紙。再進(jìn)一步除去半纖維素，就可用作纖維素衍生物的原料。<br /> 生產(chǎn)方法二：用纖維植物原料與無(wú)機酸搗成漿狀，制成α-纖維素，再經(jīng)處理使纖維素作部分解聚，然后再除去非結晶部分并提純而得。<br /> 生產(chǎn)方法三：將選好的工業(yè)木漿板疏解，然后送入已加1%～10%的鹽酸（用量為5%～10%）的反應釜進(jìn)行升溫水解，溫度為90～100℃，水解時(shí)間0.5～2h，反應結束后經(jīng)冷卻送人中和槽，用液堿調至中性，過(guò)濾后濾餅在80～100℃下干燥，后經(jīng)粉碎得產(chǎn)品。<br /> 生產(chǎn)方法四：由木漿或棉花漿制成的纖維素。經(jīng)漂白處理和機械分散后精制而成。<br/><img src="http://jmage0.huangye88.net/live/2022/04/18/51ae1b81537c25d7fbd8aa16e9277aab.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。</p> </div> <div id="qwcagsgoaso" class="pages"> <span id="qwcagsgoaso" class="leftpage"><font>上一條 </font><a target="_blank" title="梅州東洋四色油墨膠印油墨,不結皮油墨膠印油墨">梅州東洋四色油墨膠印油墨,不結皮油墨膠印油墨</a></span> <span id="qwcagsgoaso" class="rightpage"><font> 下一條</font><a target="_blank" 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