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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>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>上海樹脂和固化劑和促進(jìn)劑</p><p><span>***更新：</span>2020-06-29 08:26:14</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="8k44k0k" 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(jī): </span>0510-86658688</p><p><span>地址: </span>常澄路1號(hào)16樓1617-1620</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="uqoc4ou" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="84aqoki" class="box"><p><p> 當(dāng)然也會(huì)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(diǎn)，上海樹脂和固化劑和促進(jìn)劑，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)，上海樹脂和固化劑和促進(jìn)劑、儲(chǔ)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，上海樹脂和固化劑和促進(jìn)劑。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(shí)還能螯合金屬離子，防止樹脂氧化變色。如果想進(jìn)一步提高耐黃變、耐候性，建議再添加紫外線吸收劑進(jìn)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(hù)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(dāng)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。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海樹脂和固化劑和促進(jìn)劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286279950800781/5664313.png"></div><p style="text-indent:25px">環(huán)氧樹脂。1. 固化收縮小，隨固化劑種類而異，體積收縮為0.02%～0.8%2. 固化物的機(jī)械強(qiáng)度高3. 尺寸穩(wěn)定性好4. 粘結(jié)性好5. 電性能、耐腐蝕性能（特別是耐堿性）優(yōu)良6. 若對(duì)樹脂及固化劑進(jìn)行選擇，能得到耐熱性好的固化物7. 固化物無臭味，能用于食品行業(yè)8. 樹脂保存期長，選擇固化劑可以制成B階樹脂，有良好的預(yù)浸漬制品的特性。9. 固化時(shí)不會(huì)像聚酯那樣容易受空氣中氧的阻聚作用10. 不含揮發(fā)性單體，配合組成時(shí)常保持穩(wěn)定，纏繞特性好。1. 固化劑毒性較大2. 固化時(shí)間比聚酯長，完全固化需長時(shí)間熱處理3. 粘度大，浸漬性不好4. 固化放熱高5. 價(jià)格較高</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海樹脂和固化劑和促進(jìn)劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280878593750/9329214.png"></div><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(gè)困擾生產(chǎn)廠家的問題。通常不飽和樹脂的黃變?cè)虬ㄒ韵聨追N： </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(shí)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(duì)苯二酚，在微量氧存在時(shí)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 /> </p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/433035.html</p></div></div></div></div></div><div id="we20m0g" class="page-right twoColRt"><div id="iyom2qo" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="yowei4s" 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" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="wmuiwcq" class="recomPic likePro"><a 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