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class="pic"><img src="https://tyunfile.71360.com/UploadFile/cdcykj/637281755199150390/597478.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="qtjpq3o" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>四川省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>河南外墻異氰酸酯的用途和特點(diǎn),異氰酸酯</p><p><span>***更新：</span>2021-02-06 04:06:23</p><p><span id="click" >瀏覽次數(shù)：12次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="qdkp8xo" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">成都成英科技有限公司</a></p><p><span>聯(lián)系人：</span>何英</p><p><span>郵箱: </span>cykj789@sina.com</p><p><span>電話: </span>13558781838</p><p><span>傳真: </span>135_</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>135-58781838</p><p><span>地址: </span>龍橋鎮(zhèn)山水村3組201號</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="zhcsiti" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="sv2jjjf" class="box"><p><p> 異氰酸酯是異氰酸的各種酯的總稱。若以-NCO基團(tuán)的數(shù)量分類，包括單異氰酸酯R-N=C=O和二異氰酸酯O=C=N-R-N=C=O及多異氰酸酯等。常見的二異氰酸酯包括甲苯二異氰酸酯(TDI)、異佛爾酮二異氰酸酯(IPDI)、二苯基甲烷二異氰酸酯(MDI)、二環(huán)己基甲烷二異氰酸酯(HMDI)，河南外墻異氰酸酯的用途和特點(diǎn)、六亞甲基二異氰酸酯(HDI)、賴氨酸二異氰酸酯(LDI)。異氰酸酯用途：單異氰酸酯是有機(jī)合成的重要中間體，可制成一系列氨基甲酸酯類殺蟲劑、殺菌劑、除草劑，河南外墻異氰酸酯的用途和特點(diǎn)，也用于改進(jìn)塑料、織物、皮革等的防水性。二官能團(tuán)及以上的異氰酸酯可用于合成一系列性能優(yōu)良的聚氨酯泡沫塑料、橡膠、彈力纖維、涂料、膠粘劑，河南外墻異氰酸酯的用途和特點(diǎn)、合成革、人造木材等。異氰酸酯**度高韌度，適用范圍廣。河南外墻異氰酸酯的用途和特點(diǎn)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南外墻異氰酸酯的用途和特點(diǎn),異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281755199150390/597478.png"></div><p> 折疊毒理學(xué)簡介:人體于，吸入1~5分鐘，4名受試者均無應(yīng);，眼和呼吸道的刺激癥狀漸明顯;。臨床表現(xiàn):對眼和上呼吸道的刺激和損傷:低濃度引起流淚和咳嗽,高濃度可引起眼***和化學(xué)性灼傷。也能破壞鼻粘膜,使嗅覺喪失,上呼吸道粘膜也可致化學(xué)損傷。超過50mg/m^3的濃度,可引起皮膚水腫,組織壞死。對肺的損害:濃度超過50mg/m3時,還可導(dǎo)致化學(xué)性肺炎與肺水腫,甚至引起ARDS。未死者常伴繼發(fā)***致呼吸窨迫，肺功能受損，日久尚可形成肺纖維化。濃度很高時，也可因支氣管痙攣致窒息。此外，尚可引起呼吸道過敏反應(yīng),加重呼吸困難和肺水腫。遠(yuǎn)期影響尚難確知。對印度博帕爾事件的受害者，仍在隨訪中.折疊處理:迅速將中毒患者移離現(xiàn)場。脫去污染衣物,嚴(yán)密觀察。必要時供氧。眼及皮膚污染迅速用流水沖洗。給予對癥和支持療法。如用弱堿液局部霧化吸入,早期應(yīng)用糖皮質(zhì)***,并可用支氣管擴(kuò)張劑、***等。印度有人用一種名為Lasix的抗水腫***,收效甚微。化學(xué)反應(yīng):RNCO+R′OH→RNHCOOR′這個反應(yīng)屬于二級反應(yīng)，反應(yīng)速度隨著羥基含量而變化，不隨異氰酸酯濃度而改變。異氰酸酯與羥基的摩爾比，一般稱異氰酸酯**，R值。R值>1，端NCO封端的聚氨酯預(yù)聚體。對二異氰酸酯和二元醇而言。寧夏防火異氰酸酯工業(yè)上主要采用伯胺光氣法生產(chǎn)異氰酸酯。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南外墻異氰酸酯的用途和特點(diǎn),異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281753986855468/1640013.png"></div><p style="text-indent:25px">硝基化合物直接與一氧化碳高溫高壓催化合成異氰酸酯的工藝越來越來成熟。由于異氰酸酯結(jié)構(gòu)中含有不飽和鍵，因此具有高活性，容易與一些帶活性基團(tuán)的有機(jī)或無機(jī)物反應(yīng)，生成聚氨酯彈性體。(1)與羥基化合物的反應(yīng):如與多元醇、聚醚、聚酯酰胺、蓖麻油等含活性羥基化合物反應(yīng)生成氨甲基酸酯。(2)與含氨基化合物的反應(yīng):與胺類化合物反應(yīng)通常生成取代脲，如果進(jìn)一步發(fā)生反應(yīng)則**終生成縮二脲。(3)與水反應(yīng):與水反應(yīng)生成胺和二氧化碳，胺進(jìn)一步與異氰酸酯反應(yīng)生成取代脲。(4)與含羧基化合物的反應(yīng):與有機(jī)羧酸、末端為羧基的聚酯等化合物反應(yīng)，先生成混合酸酐，***分解放出二氧化碳而生成酰胺。。</p><p style="text-indent:25px">在聚氨酯預(yù)聚體和成中，由于種種原因尚有部分異氰酸酯單體未能進(jìn)行反應(yīng)，而呈游離狀況，這種游離態(tài)異氰酸酯的存在，不僅影響PU材料的性能及工藝操作，同時還污染環(huán)境，對加工者造成一定損傷。針對這一問題，德國朗盛（原科聚亞）研究的低游離異氰酸酯（LF）預(yù)聚體中游離異氰酸酯的含量低于0.1%，不僅改善職業(yè)健康和安全，還具有粘度低，凝膠時間長、脫模快，澆注加工效率高的特點(diǎn)，提高PU制品的撓曲壽命和動態(tài)性能，降低內(nèi)生熱。低游離系列產(chǎn)品尤其可幫助客戶生產(chǎn)出質(zhì)量的高速運(yùn)轉(zhuǎn)輪子、密封件等PU制品。硝基化合物和一氧化碳反應(yīng) ,直接生成異氰酸酯.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南外墻異氰酸酯的用途和特點(diǎn),異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281754418398437/9554837.png"></div><p style="text-indent:25px">異氰酸酯目前應(yīng)用比較廣、產(chǎn)量比較大的是有:甲苯二異氰酸酯(TolueneDiisocyanate，簡稱TDI);二苯基甲烷二異氰酸酯(MethylenediphenylDiisocyanate，簡稱MDI)。甲苯二異氰酸酯(TDI)為無色有強(qiáng)烈刺鼻味的液體，沸點(diǎn)251°C，比重，遇光變黑，對皮膚、眼睛有強(qiáng)烈刺激作用，并可引起濕疹與支氣管***，主要用于聚氨酯泡沫塑料、涂料、合成橡膠、絕緣漆、粘合劑等。根據(jù)其成分，甲苯二異氰酸酯屬含氮基的有機(jī)化合物。二苯基甲烷二異氰酸酯(MDI)分為純MDI和粗MDI。純MDI常溫下為白色固體，加熱時有刺激臭味。異氰酸酯主要用于粘合劑。寧夏防火異氰酸酯</p><p style="text-indent:25px">甲苯二異氰酸酯(TDI)為無色有強(qiáng)烈刺鼻味的液體.河南外墻異氰酸酯的用途和特點(diǎn)</p><p> 異氰酸酯是異氰酸各種酯類的總稱，是一種具有特殊氣味的液體。異氰酸酯產(chǎn)品類型主要包括單異氰酸酯、二異氰酸酯、多異氰酸酯等，被廣泛應(yīng)用在制鞋、家具、家電、汽車、建筑、塑料、膠粘劑、農(nóng)藥等領(lǐng)域。全球異氰酸酯需求持續(xù)增長，拉動異氰酸酯產(chǎn)量持續(xù)提升，21世紀(jì)以來，我國經(jīng)濟(jì)快速發(fā)展，對異氰酸酯的需求快速上升，國內(nèi)異氰酸酯產(chǎn)能的增長進(jìn)一步帶動全球異氰酸酯產(chǎn)業(yè)規(guī)模擴(kuò)大。異氰酸酯產(chǎn)品類型中，單異氰酸酯是重要的有機(jī)合成中間體，可用于制造殺蟲劑、除菌劑、除草劑等領(lǐng)域；二異氰酸酯與多異氰酸酯可用于塑料、橡膠、纖維、涂料、膠粘劑等制造領(lǐng)域。現(xiàn)階段，我國以及全球市場中，需求量比較大的異氰酸酯細(xì)分產(chǎn)品主要是甲苯二異氰酸酯（TDI）和二苯基甲烷二異氰酸酯（MDI）。河南外墻異氰酸酯的用途和特點(diǎn)</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3185540.html</p></div></div></div></div></div><div id="fcsjjz7" class="page-right twoColRt"><div id="qnopz2c" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xp88asc" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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