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href="http://www.cdcfah.com/zh/"><span>展會信息</span></a></li></ul></div></nav><section class="wrap clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="edaeio8" class="twoCol"><div id="mqheqn9" class="page-proshow clearfix"><p class="current"> 當前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_huagong/">化工</a>?<a href="http://www.cdcfah.com/cp/second-_sysqm/">實驗室器皿</a>?<a href="http://www.cdcfah.com/cp/third-sysqm_qtsysyp/">其他實驗室用品</a>?紹興2-甲基四氫呋喃有哪些品牌上海蔚云化工供應(yīng)</p><div id="iryamts" class="leftbox clearfix"><h1>紹興2-甲基四氫呋喃有哪些品牌上海蔚云化工供應(yīng)</h1><div id="cgwkcyx" class="proBig"><div id="m8pf8pr" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="3hea8li" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ihj3e7z" 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>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>紹興2-甲基四氫呋喃有哪些品牌,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-10-31 05:24:34</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="3ia3bgc" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海蔚云化工有限公司</a></p><p><span>聯(lián)系人：</span>盛志華</p><p><span>郵箱: </span>3273929241@qq.com</p><p><span>電話: </span>18721726651</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.weiyunhuagong.com</p><p><span>手機: </span>021-52909928</p><p><span>地址: </span>靜安區(qū)靈石路709號55幢A2113室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="e8avxev" class="page-proshow02"><p class="title">詳細說明</p><div id="ix38mdu" class="box"><p><p style="text-indent:25px">在常溫下大多數(shù)聚四氫呋喃二醇是白色蠟狀固體，在40℃左右熔化成低黏度無色至淺黃色透明液體。分子量為650～2900的PTMEG閃點（PMCC）這197～207℃，熔點（凝固點）為11～38℃（詳細數(shù)據(jù)請見有關(guān)廠家的產(chǎn)品數(shù)據(jù)），熔化了的PTMEG可過冷，結(jié)晶緩慢。聚四氫呋喃二醇折射率（25℃）為1.464。不溶于水，在水中的溶解度小于1%，也不溶于脂肪烴，可溶于芳烴、氯化烴、醇、酯、酮等極性有機溶劑。聚四氫呋喃二醇在隔絕氧氣下貯存穩(wěn)定，例如在氮氣保護下55℃以下可至少穩(wěn)定貯存1年，紹興2-甲基四氫呋喃有哪些品牌。在100℃只能貯存數(shù)天。長期接觸空氣可導致氧化和降解，造成色澤變黃、過氧化物含量和酸值增加，紹興2-甲基四氫呋喃有哪些品牌，在無空氣下210～220℃發(fā)生熱降解，生成四氫呋喃，為了改善貯存穩(wěn)定性，PTMKEG工業(yè)品中一般加有微量的抗氧劑。甲基四氫呋喃容易冷凝回收，紹興2-甲基四氫呋喃有哪些品牌，揮發(fā)損失少，大氣污染小。紹興2-甲基四氫呋喃有哪些品牌</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="紹興2-甲基四氫呋喃有哪些品牌,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png"></div><p style="text-indent:25px"> 鈀催化硅試劑與鹵化物的偶聯(lián) 反應(yīng) C-N鍵形成的偶聯(lián) 反應(yīng) 酮的α-芳基化反應(yīng) 鈀催化的烯丙基類化合物的反應(yīng)兩相反應(yīng)的溶劑，MeTHF是非常有效的兩相反應(yīng)溶劑，特別是在氫氧化鈉水溶液中進行的烷基化、酰胺化和親核取代反應(yīng)。MeTHF 作為兩相反應(yīng)的溶劑，不僅反應(yīng)易進行，而且分層界面清晰。由于MeTHF作溶劑時，產(chǎn)品分離回收更方便，因而常用作還原胺化和胺的?；磻?yīng)溶劑。極易揮發(fā)，通常都有大量損失；致ai物質(zhì)；鹵代烷是嚴格受限制的化學品。 4.5 2-MeTHF－鹵代烷的優(yōu)良替代品鹵代烷的缺點： 2-MeTHF相對于CH2Cl2的優(yōu)越性與水微溶，回收方便；對溶解在DCM中的極性化合物具有很強的溶解性。宿遷2-甲基四氫呋喃公司聚四氫呋喃主要用作嵌段聚氨酯或嵌段聚醚聚酯的軟鏈段。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="紹興2-甲基四氫呋喃有哪些品牌,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">呋喃類藥是一類化學合成藥。能作用于細菌的酶系統(tǒng)，干擾細菌的糖代謝而有抑菌作用。使用的呋喃類藥物有10余種，較常用的有呋喃妥因、呋喃唑酮、呋喃西林等，臨床上因呋喃西林易引起多發(fā)性神經(jīng)炎，故只供外用。呋喃妥因（呋喃啶）***范圍較廣，對多種革蘭氏陽、陰性細菌均有控制作用，但對綠膿桿菌無效。吸收后由尿排泄，常用于***泌尿系***。細菌對本品不易產(chǎn)生耐藥性。可口服用藥。注意：腎功能不全者慎用。過敏反應(yīng)可致胸悶、氣喘等?？砂l(fā)生周圍神經(jīng)炎，表現(xiàn)為手足麻木及肌萎縮。中毒性精神癥狀則為幻視、幻聽等。胃腸道反應(yīng)、溶血性貧血及肺部并發(fā)癥也能發(fā)生。呋喃唑酮（痢特靈）***譜和呋喃啶相似，對消化道的多種細菌有控制作用，也可控制滴蟲。口服吸收較少，主要在腸道起作用，主治腸炎、痢疾和傷寒等。對幽門螺旋菌有控制作用，故可用于***潰瘍病?？煽诜盟?。注意：常見胃腸反應(yīng)；常有遲發(fā)性皮疹、等反應(yīng)；也可發(fā)生肺浸潤、***、直立性低血壓、低血糖等反應(yīng)。本品可引起多發(fā)性神經(jīng)炎，每日量超過0.4克或總量超過3克時較易發(fā)生，癥狀可遷延至數(shù)月或一年以上，故應(yīng)密切控制用量。新生兒或先天缺少血球保護酶者可致溶血性貧血。</p><p style="text-indent:25px">以端羥基環(huán)氧乙烷-四氫呋喃共聚醚（PET）和烯丙基異氰酸酯為原料，二丁基錫二月桂酸酯為催化劑，經(jīng)過加成反應(yīng)制備出一種含氨基甲酸酯基團的端烯基環(huán)氧乙烷-四氫呋喃共聚醚（AUPET）；通過紅外光譜、核磁共振氫譜、碳譜和凝膠滲透色譜對AUPET的結(jié)構(gòu)進行了表征；采用錐板黏度計測定了其黏度；采用DSC測定了其玻璃化轉(zhuǎn)變溫度；通過拉伸實驗測定了其與四甲基對苯二腈氧化物（TTNO）固化后所得聚異噁唑啉彈性體的力學性能。結(jié)果表明，反應(yīng)后PET端羥基吸收峰完全消失，出現(xiàn)了烯基和氨基甲酸酯基團的特征峰，聚醚分子鏈未發(fā)生斷裂；AUPET的玻璃化轉(zhuǎn)變溫度為-69.9℃，20℃時黏度為53.2 Pa·s；AUPET基聚異噁唑啉彈性體室溫下的拉伸強度為1.75 MPa，斷裂伸長率為125%，優(yōu)于HTPB基聚異噁唑啉彈性體。甲基四氫呋喃是作為綠色溶劑替代四氫呋喃的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="紹興2-甲基四氫呋喃有哪些品牌,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623991305064/1986424.png"></div><p style="text-indent:25px">試劑和儀器，試劑：所用試劑均為分析純試劑；儀器：循環(huán)水泵、電動攪拌器、旋轉(zhuǎn)蒸發(fā)儀、反應(yīng)精餾裝置、GC-2010 Plus氣相色譜儀，GCMS-QP 2010 SE氣質(zhì)聯(lián)用儀。固體酸催化劑的制備，在三口燒瓶上裝上高速攪拌器、溫度計，加入一定量飽和氯化鈉水溶液，加入明膠、聚乙烯醇作為分散劑。開啟攪拌，分散劑均勻分散后，稱量摩爾比為5:1的鄰氯苯乙烯和二乙烯基苯，再取定量液體石臘作為致孔劑和過氧化苯甲酰作為引發(fā)劑加入反應(yīng)器中，升溫開始反應(yīng)，75℃保持12小時。反應(yīng)中監(jiān)控油珠分散情況，隨時調(diào)整攪拌速度以控制油珠分散度和顆粒大小。反應(yīng)結(jié)束后緩慢冷卻、過濾，以熱水洗滌并烘干。用石油醚萃取致孔劑，篩分出直徑0.5~0.7mm的樹脂骨架，以二氯乙烷溶脹。溶脹完成后，在良好攪拌下加入定量濃硫酸，升溫回流并保持5小時。蒸出二氯乙烷，加入定量發(fā)煙硫酸，升溫至110℃反應(yīng)。反應(yīng)過程中定時取樣，測定樹脂交換量，達到預定值后結(jié)束反應(yīng)，降溫。以蒸餾水小心的洗滌樹脂至洗液中性，自然晾干。四氫呋喃并用于天然氣加味。紹興2-甲基四氫呋喃有哪些品牌</p><p style="text-indent:25px">四氫呋喃與水能混溶。紹興2-甲基四氫呋喃有哪些品牌</p><p style="text-indent:25px">呋喃和其衍生物為例如醫(yī)藥、除草劑和聚合物領(lǐng)域中的工業(yè)化學品的適用前體。呋喃可以轉(zhuǎn)化成四氫呋喃(THF)和1,4-丁二醇(1,4-BDO)。THF和1,4-BDO為在工業(yè)上用作溶劑并且用于彈性纖維(如氨綸/彈性纖維)、聚丁酸對苯二甲酸酯和γ丁內(nèi)酯的衍生物的制造中的有價值的化學物質(zhì)。這些化學品通常通過多種途徑由從化石燃料獲得的石油化學原料以工業(yè)方式制得。用于生產(chǎn)1,4-BDO的一種工業(yè)途徑需要使乙炔與兩當量的甲醛反應(yīng)，隨后氫化所得的1,4-丁炔二醇以形成1,4-丁二醇。在替代方法中，將環(huán)氧丙烷轉(zhuǎn)化為烯丙醇。然后使烯丙醇氫甲?；孕纬?-羥基丁醛，其可以經(jīng)氫化以形成1,4-丁二醇。其它傳統(tǒng)的途徑使用丁二烯、乙酸烯丙酯或丁二酸作為起始物質(zhì)。1,4-丁二醇也可以產(chǎn)生為通過將粗正丁烷氧化為順丁烯二酸酐，接著催化氫化而制造四氫呋喃(THF)的方法中的副產(chǎn)物。近年來，更多工作聚焦于從可再生原料，如基于糖的材料產(chǎn)生化學品，包括1,4-BDO和THF。紹興2-甲基四氫呋喃有哪些品牌</p><p style="text-indent:25px">上海蔚云化工有限公司是一家化工產(chǎn)品（除危險化學品、監(jiān)控化學品、煙花爆竹、民用物品、易制毒化學品）、化工機械設(shè)備及配件的銷售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開發(fā)、技術(shù)轉(zhuǎn)讓、技術(shù)服務(wù)、技術(shù)咨詢。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】的公司，致力于發(fā)展為創(chuàng)新務(wù)實、誠實可信的企業(yè)。公司自創(chuàng)立以來，投身于環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，是化工的主力軍。上海蔚云化工不斷開拓創(chuàng)新，追求出色，以技術(shù)為先導，以產(chǎn)品為平臺，以應(yīng)用為重點，以服務(wù)為保證，不斷為客戶創(chuàng)造更高價值，提供更優(yōu)服務(wù)。上海蔚云化工始終關(guān)注化工行業(yè)。滿足市場需求，提高產(chǎn)品價值，是我們前行的力量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1783217.html</p></div></div></div></div></div><div id="q8kwtfw" class="page-right twoColRt"><div id="swdvmtv" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="hwd8yah" 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配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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