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src="https://tyunfile.71360.com/UploadFile/cdcykj/637281754176621093/2041773.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="2xtvzv3" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/cdcykj/637281754176621093/2041773.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="qp87dtc" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>貴陽(yáng)異氰酸酯哪家好,異氰酸酯</p><p><span>***更新：</span>2021-02-04 10:07:55</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="y8ylskr" 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(hào)</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="mw8xpgn" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="xheqseg" class="box"><p><p> ，貴陽(yáng)異氰酸酯哪家好.光氣法按生產(chǎn)工藝條件來(lái)分,光氣法可分為液相光氣法和氣相光氣法。(1)液相光氣法①液相成鹽光氣化法：胺類首先與HCl或CO2氣體形成相應(yīng)的鹽酸鹽或碳酸鹽,然后再與液相光氣反應(yīng)得到異氰酸酯。該技術(shù)的使用可在溫和的條件下(甚至是室溫)制得異氰酸酯,同時(shí)反應(yīng)收率較高,但缺點(diǎn)是反應(yīng)時(shí)間長(zhǎng)、所需溶劑量大、副產(chǎn)物多且難于分離，貴陽(yáng)異氰酸酯哪家好。②液相直接光氣法：主要用于反應(yīng)活性低、沸點(diǎn)高、不易汽化的胺類化合物與光氣發(fā)生反應(yīng),是TDI、MDI等主流異氰酸酯產(chǎn)品所廣，貴陽(yáng)異氰酸酯哪家好. 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。貴陽(yáng)異氰酸酯哪家好</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="貴陽(yáng)異氰酸酯哪家好,異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281754176621093/2041773.png"></div><p style="text-indent:25px">目前羰基化法合成異氰酸酯的研究基本有一步法和二步法兩種。一步法的羰基化zui早是由美國(guó)氰胺公司于1963年提出，該法使用硝基苯和CO為原料，在銠系催化劑、三氯化鐵或其他路易斯酸共催化劑作用下，于190℃和約20MPa高壓下反應(yīng)，可獲得收率35％的苯基異氰酸酯。使用二硝基甲苯和CO，在鈀、銠等的氯化物及其絡(luò)合物，鉻、鉬、錳等鹵化物和氧化物存在下，于190～220℃和20～30MPa下反應(yīng)，也可以獲得甲苯二異氰酸酯，收率比較高可達(dá)50％～60％。對(duì)于羰基法，目前研究較多的是二步法工藝，即使用硝基化合物和一氧化碳在醇類化物存在和高溫、高壓下反應(yīng)，首先生產(chǎn)氨基甲酸酯，然后使氨基甲酸酯進(jìn)行熱分解。昭通巴斯夫異氰酸酯品牌與氨基甲酸酯的反應(yīng):反應(yīng)生成脲基甲酸酯。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="貴陽(yáng)異氰酸酯哪家好,異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281755363974609/1893677.png"></div><p style="text-indent:25px">1、在光氣合成單元須設(shè)置CO在線分析儀，對(duì)甲烷、氫氣等雜質(zhì)進(jìn)行在線檢測(cè)，提高光氣合成反應(yīng)工藝的安全性，保證氯氣水分小于50ppm;2、對(duì)含有光氣物料帶有攪拌的容器和反應(yīng)器及泵類，須采用性能可靠的雙機(jī)械密封裝置，確保轉(zhuǎn)動(dòng)設(shè)備不發(fā)生光氣泄漏;3、對(duì)含有光氣物料的設(shè)備，要留有安全的腐蝕裕度，避免出現(xiàn)腐蝕泄漏問(wèn)題;4、對(duì)液體光氣和光氣濃度大于20%的液體儲(chǔ)罐，宜采用充壓夾套保護(hù)或密閉光氣室保護(hù)，對(duì)液體光氣管線宜采用套管保護(hù)，預(yù)防事故風(fēng)險(xiǎn)的發(fā)生;5、為防止系統(tǒng)超壓危險(xiǎn)，在關(guān)鍵設(shè)備上必須設(shè)置超壓排放閥門與緊急分解系統(tǒng)相連。中毒侵入途徑:主要經(jīng)呼吸道吸入。由于MIC在水中易分解,故進(jìn)入血流的可能性很小。</p><p style="text-indent:25px">在胺化合物的溶劑中通入二氧化碳，使胺首先轉(zhuǎn)化成氨基甲酸鹽，進(jìn)行冷光氣化反應(yīng)生成氨基甲酸鹽絡(luò)合物，然后在高溫光氣化反應(yīng)中生成異氰酸酯。此法可用于六亞甲基二異氰酸酯的工業(yè)化生產(chǎn)。氣相光氣化法以上3種均為液相反應(yīng)，反應(yīng)均在惰性溶劑中進(jìn)行。該法為氣相法，胺在惰性氣體或惰性溶劑的蒸氣中氣化，在催化劑存在的條件下于150～470℃進(jìn)行光氣化反應(yīng)，生成的氨基甲酸鹽絡(luò)合物在惰性溶劑和脫鹽酸添加劑的作用下加熱，分解后生成有機(jī)異氯酸酯。除不銹鋼、鎳、玻璃、陶瓷外其他材料與其接觸均有被腐蝕危險(xiǎn)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="貴陽(yáng)異氰酸酯哪家好,異氰酸酯" src="https://tyunfile.71360.com/UploadFile/cdcykj/637281755141914062/2919879.png"></div><p> 異氰酸酯與水的反應(yīng):2RNCO + H2O → RNHCONHR + CO2↑1個(gè)水分子與2個(gè)NCO基團(tuán)反應(yīng)得到取代脲，水可以看做一種擴(kuò)鏈劑或固化劑。這點(diǎn)對(duì)聚氨酯的生產(chǎn)及儲(chǔ)存具有重要的指導(dǎo)意義。原材料和產(chǎn)品都需要嚴(yán)格控制水分含量。反應(yīng)放出二氧化碳?xì)怏w，可用在聚氨酯泡沫的生產(chǎn)中，還有濕固化的聚氨酯膠黏劑和涂料。 </p> <p> 異氰酸酯與胺基的反應(yīng):RNCO + R′NH2 → RNHCONHR′ RNCO + R′NHR〞 → RNHCONR′R〞脂肪族伯胺反應(yīng)速度太快，一般很少用。脂肪族仲胺和芳香族伯胺反應(yīng)速度稍慢，常用來(lái)固化NCO封端的預(yù)聚體。MOCA、E-300、unilink4200等; 工業(yè)上主要采用伯胺光氣法生產(chǎn)異氰酸酯。貴陽(yáng)異氰酸酯哪家好</p><p style="text-indent:25px">異氰酸的各種酯的總稱。有一異氰酸酯R-N=C=O和二異氰酸酯O=C=N-R-N=C=O。一般是不愉快氣味的液體。貴陽(yáng)異氰酸酯哪家好</p><p> 聚氨酯工業(yè)中主要使用的有機(jī)異氰酸酯，如TDI、MDI、HDI等均是采用胺成鹽二段光化反應(yīng)的歷程制備的，產(chǎn)品收率高、質(zhì)量好，但生產(chǎn)中使用的光氣是劇毒化學(xué)品，反應(yīng)生產(chǎn)的氯化氫是強(qiáng)腐蝕性化學(xué)品，因此對(duì)生產(chǎn)管理、設(shè)備安全運(yùn)行和環(huán)境保護(hù)等都是嚴(yán)峻的挑戰(zhàn)。國(guó)外許多大公司，在生產(chǎn)有機(jī)異氰酸酯的過(guò)程，積累了大量有益的經(jīng)驗(yàn)，在設(shè)備的耐壓、防腐、連續(xù)自動(dòng)化控制、防泄漏、***預(yù)警和應(yīng)急處理、生產(chǎn)管理和設(shè)備管理等方面都制定了相應(yīng)的技術(shù)指標(biāo)和實(shí)施方法，以確保產(chǎn)品的正常生產(chǎn)。我國(guó)在引進(jìn)生產(chǎn)異氰酸酯生產(chǎn)裝置時(shí)，除應(yīng)注意引進(jìn)生產(chǎn)的“硬件”裝備外，還應(yīng)注意引進(jìn)相應(yīng)安全生產(chǎn)、管理、控制等方面的“軟件”。利用胺的光氣化法這一原理，還可以制備各種有機(jī)異氰酸酯。如生產(chǎn)酰氯異氰酸酯。貴陽(yáng)異氰酸酯哪家好</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3158984.html</p></div></div></div></div></div><div id="cmtqxel" class="page-right twoColRt"><div id="cbtqxu2" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="8bnprda" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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