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href="http://www.cdcfah.com/cp/third-gyhwzx_qtgyhw/">其他過氧化物</a>?湛江質(zhì)量固化劑歡迎來電江陰泉林化學(xué)品供應(yīng)</p><div id="3czb872" class="leftbox clearfix"><h1>湛江質(zhì)量固化劑歡迎來電江陰泉林化學(xué)品供應(yīng)</h1><div id="utqsub8" class="proBig"><div id="8j8qspm" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280878593750/9329214.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="37kphjq" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280878593750/9329214.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="odv2gnu" 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>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>湛江質(zhì)量固化劑,固化劑</p><p><span>***更新：</span>2020-07-26 18:19:44</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="rldamj2" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">江陰泉林化學(xué)品有限公司</a></p><p><span>聯(lián)系人：</span>葉奇</p><p><span>郵箱: </span>63173667@QQ.COM</p><p><span>電話: </span>13861290603</p><p><span>傳真: </span>0510_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0510-86658688</p><p><span>地址: </span>常澄路1號16樓1617-1620</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="7k4nk8a" class="page-proshow02"><p class="title">詳細說明</p><div id="jdvskro" class="box"><p><p> 不飽和聚酯樹脂（UPR）的固化似乎是從理論和實踐上已研究得十分透徹的問題，但是因為影響固化反應(yīng)的因素相當復(fù)雜，而在UPR的各種應(yīng)用領(lǐng)域中，制品所出現(xiàn)的質(zhì)量瑕疵在很大程度上幾乎都與“固化”有關(guān)，湛江質(zhì)量固化劑。所以，我們有對 UPR 的固化進行較深入探討的必要。（探討不飽和聚酯樹脂的固化，首先應(yīng)該了解與不飽和聚酯樹脂固化有關(guān)的一些概念和定義） </p> <p> 與不飽和聚酯樹脂固化有關(guān)的概念和定義 </p> <p> 1 固化的定義 </p> <p> 液態(tài) UPR 在光、熱或引發(fā)劑的作用下可以通過線型聚酯鏈中的不飽和雙鍵與交聯(lián)單體的雙鍵的結(jié)合，形成三向交聯(lián)的不溶不熔的體型結(jié)構(gòu)。這個過程稱為 UPR 的固化。 </p> <p> 2固化劑 </p> <p> 不飽和聚酯樹脂的固化是游離基引發(fā)的共聚合反應(yīng)，如何能使反應(yīng)啟動是問題的關(guān)鍵，湛江質(zhì)量固化劑。單體一旦被引發(fā)，產(chǎn)生游離基，分子鏈即可以迅速增長而形成三向交聯(lián)的大分子，湛江質(zhì)量固化劑。 </p> <p> 不飽和聚酯樹脂固化的啟動是首先使不飽和 C—C 雙鍵斷裂，由于化學(xué)鍵發(fā)生斷裂所需的能量不同，對于 C—C 鍵，其鍵能 E=350kJ/mol，需 350-550℃的溫度才能將其激發(fā)裂解。 </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> 在這一固化過程中，存在三種可能發(fā)生的化學(xué)反應(yīng)。湛江質(zhì)量固化劑</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湛江質(zhì)量固化劑,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280878593750/9329214.png"></div><p> 當然也會有其他導(dǎo)致樹脂變黃的原因?？偟膩碚f熱氧和紫外線是黃變的主要原因。采用飽和二元酸(或酸酐)代替芳香族二元酸(或酸酐)，雖然可以在一定程度上使樹脂顏色淺一點，但考慮到樹脂性能、成本等各方面的因素，所以此法也是不夠理想的。 </p> <p> 據(jù)**介紹，除了在生產(chǎn)、儲存過程中充惰性氣體盡可能隔絕與氧氣的接觸外，更有效的方法是添加抗氧劑與紫外線吸收劑，可有效地防止與延遲聚酯發(fā)生黃變。推薦的不飽和樹脂抗黃變解決方案是：選用不含胺類的抗氧劑，而采用主輔抗氧劑復(fù)配使用，主抗氧劑通常為受阻酚類，可以捕捉過氧化自由基；輔助抗氧劑則為亞磷酸酯類，在分解氫過氧化物的同時還能螯合金屬離子，防止樹脂氧化變色。如果想進一步提高耐黃變、耐候性，建議再添加紫外線吸收劑進去，添加紫外線吸收劑能有效***高分子材料，在紫外線作用下的黃變現(xiàn)象，且給產(chǎn)品提供優(yōu)異的保護作用，有效防止光澤的降低、裂紋、氣泡、脫層的產(chǎn)生，明顯提高產(chǎn)品的耐候性，與抗氧劑一起使用有很好的協(xié)同效應(yīng)。當然抗氧劑與紫外線吸收劑的使用，并不能從根本上解決黃變問題，但是在一定的范圍內(nèi)，還是能有效地防止不飽和聚酯產(chǎn)品氧化黃變，保持產(chǎn)品水色透明，提高產(chǎn)品的檔次。海南制造固化劑便宜通常需要幾天或幾星期甚至更長的時間。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湛江質(zhì)量固化劑,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286279900429688/2943002.png"></div><p> 后固化處理方法：可于 40℃下 2 小時，60℃下 2 小時，80℃下 4 小時進行處理，（如果有條件可于 100-120℃處理 2 小時效果更佳）然后常溫養(yǎng)護 24 小時后再投入使用。如施工單位無熱處理條件，可在施工后常溫養(yǎng)護 1 個月（環(huán)境溫度低時還要適當延長養(yǎng)護時間），使其充分固化，再投入使用。這一點對于耐腐蝕用途的樹脂固化尤為重要。 </p> <p> 一定量的 UPR 混合物固化時所放出的熱量是固定的，它取決于其組分的化學(xué)成份。但是放熱的速度及由此而引起的溫度上升速度和體系所能達到的比較高放熱峰溫度則取決于UPR 混合物的形狀與尺寸、周圍的溫度、所加入的引發(fā)劑、促進劑及阻聚劑的成分與濃度諸多因素。在同樣成分下，大制件相對小制件熱損失少，溫升就較高。如果參與固化的 UPR量太大，有可能造成放熱失控，體系會因放熱、收縮而開裂，甚至分解冒黑，直至著火。 </p><p style="text-indent:25px">1. 固化時無揮發(fā)性副產(chǎn)物，幾乎達**固化2. 固化迅速，即使常溫下也能固化3. 可用多種手段實現(xiàn)固化，如：過氧化物、紫外線、射線等。4. 可低壓成型，接觸壓成型5. 機械及電性能優(yōu)良6. 耐藥品性好7. 能賦于柔軟性、硬質(zhì)、耐候性、耐熱性、耐藥品性、觸變性、難燃、自熄等特征8. 可著色，獲得透明美觀的涂膜9. 能實現(xiàn)兼具保護與裝飾的涂裝10. 固化時放熱，使溫度上升，這一點可在冷模壓中獲得應(yīng)用。1. 空氣中的氧妨礙固化2. 收縮性大，一般有百分之幾的收縮率3. 硫磺、酚類化合物、碳混入時，固化困難4. 固化方法不當時，由于固化放熱及收縮不理想，在制品中會產(chǎn)生裂紋。5. 固化易受溫度、濕度影響6. 制造后隨時間的推移其固化特性等也容易產(chǎn)生變化7. 可燃性差8. 是粘稠性液體，有特殊的刺激性味這一階段大約需要幾十分鐘至幾小時。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湛江質(zhì)量固化劑,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280068066406/7446006.png"></div><p> 樹脂中阻聚劑等其它添加劑的影響 </p> <p> 在保存未固化的液體 UPR 時，要加入阻聚劑，使 UPR 商品在貯存過程中免于過早膠凝變質(zhì)。引發(fā)劑和促進劑反應(yīng)釋放出的游離基，一開始是被阻聚劑消耗掉，阻聚劑變?yōu)榉€(wěn)定的大分子失去阻聚能力。因此，低反應(yīng)活性的樹脂有可能因為其中加入的阻聚劑量很少而顯得反應(yīng)活性很高，而高反應(yīng)活性的樹脂也可能因其中加入了較大量的阻聚劑變得不甚活潑。另外樹脂中的填料、色漿、低收縮添加劑等也會影響樹脂的固化程度。聚酯分子與聚酯分子之間的反應(yīng)。湛江質(zhì)量固化劑</p><p style="text-indent:25px">如果參與固化的 UPR量太大，有可能造成放熱失控，體系會因放熱、收縮而開裂，甚至分解冒黑，直至著火。湛江質(zhì)量固化劑</p><p> 不飽和聚酯樹脂作為復(fù)合材料，在涂料、玻璃鋼、人造石、工藝品等領(lǐng)域，都已經(jīng)得到了較好的應(yīng)用。但不飽和樹脂的顏色黃變，一直是一個困擾生產(chǎn)廠家的問題。通常不飽和樹脂的黃變原因包括以下幾種： </p> <p> 1、不飽和樹脂酯化合成過程中，由于高溫引起的熱老化黃變，不飽和樹脂一般酯化溫度，為180～220℃甚至更高，在此溫度下樹脂很容易因熱老化而變黃，影響樹脂產(chǎn)品外觀； </p> <p> 2、樹脂接觸紫外線而引起的黃變，主要因素是樹脂中存在的苯環(huán)(包括芳香族二元酸/酐和苯乙烯引入的苯環(huán))，原因可能是芳香族化合物在高溫時發(fā)生熱氧降解，容易發(fā)生π→π軌道上的電子躍遷，使樹脂呈現(xiàn)黃色； </p> <p> 3、樹脂生產(chǎn)過程中，因裝置密封性不好等原因使原料接觸氧氣，通用不飽和聚酯分子鏈中不僅含有酯基、羥基、羧基，而且含有雙鍵和芳香環(huán)，微量氧能使其發(fā)生熱氧化降解，**明顯的表現(xiàn)就是樹脂顏色變黃。 </p> <p> 4、添加劑的影響如抗氧劑、阻聚劑、固化劑等，胺類抗氧劑易轉(zhuǎn)變成氮氧自由基而使制品著色，常用的阻聚劑，如對苯二酚，在微量氧存在時氧化為醌類，醌類本身帶有顏色，從而影響樹脂的顏色，固化劑有些廠家仍采用過氧化酰類-叔胺體系和過氧化酮類-金屬皂體系，由于叔胺和金屬皂都有顏色，容易使樹脂著色。 </p> <p> <br /> 湛江質(zhì)量固化劑</p><p style="text-indent:25px">江陰泉林化學(xué)品有限公司致力于化工，以科技創(chuàng)新實現(xiàn)***管理的追求。江陰泉林作為不飽和樹脂，乙烯基樹脂，環(huán)氧樹脂，玻纖纖維紗，玻纖纖維布，促進劑，固化劑，脫模劑，脫模蠟，玻璃纖維氈，環(huán)氧固化劑，環(huán)氧樹脂色漿，樹脂色漿，樹脂膠衣，高溫固化劑，粒子引發(fā)劑，DTBP，以及樹脂配套類產(chǎn)品。的品牌企業(yè)，為客戶提供質(zhì)量的[ "不飽和聚酯樹脂不飽和樹脂", "乙烯基樹脂，樹脂，膠衣", "玻璃纖維紗，玻璃纖維布", "固化劑促進劑，環(huán)氧固化劑" ]。公司擁有多年的行業(yè)經(jīng)驗，每年以銷售收入達到1000-2000萬元，如果您想了解更多產(chǎn)品信息，請通過頁面上的電話聯(lián)系我們。江陰泉林始終關(guān)注化工市場，以敏銳的市場洞察力以準確定位，實現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/709095.html</p></div></div></div></div></div><div id="udf8wda" class="page-right twoColRt"><div id="hwd8kho" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="qfh78hg" 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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