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class="button">聯(lián)系我們</a></div></div><div id="sldfmov" 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="u834iuw" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="kyqsprt" class="box"><p><p> 不飽和聚酯樹(shù)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(shù)脂的顏色黃變，一直是一個(gè)困擾生產(chǎn)廠家的問(wèn)題。通常不飽和樹(shù)脂的黃變?cè)虬ㄒ韵聨追N： </p> <p> 1、不飽和樹(shù)脂酯化合成過(guò)程中，由于高溫引起的熱老化黃變，不飽和樹(shù)脂一般酯化溫度，為180～220℃甚至更高，在此溫度下樹(shù)脂很容易因熱老化而變黃，影響樹(shù)脂產(chǎn)品外觀； </p> <p> 2、樹(shù)脂接觸紫外線而引起的黃變，主要因素是樹(shù)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))，韶關(guān)E08固化劑廠商，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(shù)脂呈現(xiàn)黃色； </p> <p> 3、樹(shù)脂生產(chǎn)過(guò)程中，因裝置密封性不好等原因使原料接觸氧氣，韶關(guān)E08固化劑廠商，通用不飽和聚酯分子鏈中不*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(shù)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，韶關(guān)E08固化劑廠商，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(shù)脂的顏色，固化劑有些廠家仍采用過(guò)氧化酰類-叔胺體系和過(guò)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(shù)脂著色。 </p> <p> <br /> 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(dá)到的比較高放熱峰溫度則取決UPR 混合物的形狀與尺寸。韶關(guān)E08固化劑廠商</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)E08固化劑廠商,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286279900429688/2943002.png"></div><p> 不飽和聚酯樹(shù)脂（UPR）的固化似乎是從理論和實(shí)踐上已研究得十分透徹的問(wèn)題，但是因?yàn)橛绊懝袒磻?yīng)的因素相當(dāng)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)。所以，我們有對(duì) UPR 的固化進(jìn)行較深入探討的必要。（探討不飽和聚酯樹(shù)脂的固化，首先應(yīng)該了解與不飽和聚酯樹(shù)脂固化有關(guān)的一些概念和定義） </p> <p> 與不飽和聚酯樹(shù)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(guò)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(gè)過(guò)程稱為 UPR 的固化。 </p> <p> 2固化劑 </p> <p> 不飽和聚酯樹(shù)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(dòng)是問(wèn)題的關(guān)鍵。單體一旦被引發(fā)，產(chǎn)生游離基，分子鏈即可以迅速增長(zhǎng)而形成三向交聯(lián)的大分子。 </p> <p> 不飽和聚酯樹(shù)脂固化的啟動(dòng)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(duì)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 /> 揚(yáng)州快速固化劑地坪廠家環(huán)境溫度較高條件下可適當(dāng)減少促進(jìn)劑的加入量，以得到足夠長(zhǎng)的凝膠時(shí)間和較完全的固化程度。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)E08固化劑廠商,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280878593750/9329214.png"></div><p> 過(guò)氧化環(huán)己酮（是多種氫過(guò)氧化物的混合物） </p> <p> 其中以第（Ⅰ）種結(jié)構(gòu)為主。 </p> <p> 過(guò)氧化環(huán)己酮溶解在二丁酯中，成為 50%的糊狀物，稱為 1#固化劑。 <p> <p> 過(guò)氧化二苯甲酰（是一種過(guò)氧化物，簡(jiǎn)稱 BPO） </p> <p> 過(guò)氧化二苯甲酰溶解在二丁酯中，成為 50%的糊狀物，稱為 2#固化劑 <p> 過(guò)氧化甲乙酮（簡(jiǎn)稱 MEKP） </p> <p> 這是一種液態(tài)固化劑，一般配成有效成份為 50%的二甲酯溶液，就是市售的 5#固化劑。 </p> <p> 在有效成份中，同樣，不是單一化合物，而是由多種分子結(jié)構(gòu)的氫過(guò)氧化物的混合物： </p> </p> <p> <br /> </p> </p> <p> <br /> </p> </p> <p> <br /> </p> <p> <br /> </p><p> 回彈法 </p> <p> 回彈法是把小鋼球從一定高度落向被測(cè)固化樹(shù)脂表面，由于固化程度不同，樹(shù)脂的剛性是不同的，所以回彈高度亦不同，回彈高度可表明固化程度。 </p> <p> 測(cè)成型制品中的不可溶物含量，即用**來(lái)萃取出樹(shù)脂中的可溶性成分，從而得到不可溶物含量。此法也適用于環(huán)氧或酚醛 FRP，是目前用得比較多的方法。其原理是樹(shù)脂固化前是線型分子、易溶于有機(jī)溶劑，而固化后變成體型網(wǎng)狀結(jié)構(gòu)、難溶于有機(jī)溶劑的特點(diǎn)，采取有機(jī)溶劑萃取出已固化樹(shù)脂中的可溶組份，再根據(jù)玻璃鋼試樣在萃取前后的重量差進(jìn)行計(jì)算，以此間接地說(shuō)明固化程度。對(duì)于大面積噴涂成型，可能因?yàn)榻宦?lián)劑的揮發(fā)而導(dǎo)致交聯(lián)劑不足也要適當(dāng)增加促進(jìn)劑固化劑的量以縮短凝膠時(shí)間。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)E08固化劑廠商,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637281088517138672/3325203.png"></div><p> 活性氧含量：活性氧含量簡(jiǎn)單來(lái)說(shuō)就是過(guò)氧化物中氧和過(guò)氧化物分子總量的百分比。 </p> <p> 從這個(gè)概念本身來(lái)說(shuō)，一個(gè)具有較低的分子量的過(guò)氧化物的活性氧含量可能相對(duì)較高。但這并不意味著活性氧含量高的過(guò)氧化物比活性氧含量低的過(guò)氧化物具有更多或更快的活性。（因?yàn)槲覀兒芏鄳?yīng)用廠家是用活性氧含量作為考核固化劑的一個(gè)指標(biāo)）事實(shí)上，活性氧含量**是作為一個(gè)恒量任何一個(gè)特定的過(guò)氧化物的濃度和純度的一個(gè)尺度。人們發(fā)現(xiàn)許多具有較高的活性氧含量的過(guò)氧化物并不適合用于固化樹(shù)脂，因?yàn)樗鼈冊(cè)跇?biāo)準(zhǔn)的固化溫度下會(huì)很快地分解或“耗盡”，也就是它分解游離基的速度過(guò)快。由于游離基總是有一種彼此間相互結(jié)合的強(qiáng)烈傾向，當(dāng)游離基產(chǎn)生的速度比它們被不飽和雙鍵利用的速度快時(shí)，它們會(huì)重新組合或者終止聚合鏈，從而產(chǎn)生低分子量的聚合物而導(dǎo)致不完全固化的結(jié)果。（典型的例子就是過(guò)氧化氫）。 </p> <p> <br /> </p> <p> <br /> 在同樣成分下，大制件相對(duì)小制件熱損失少，溫升就較高。韶關(guān)E08固化劑廠商</p><p style="text-indent:25px">如施工單位無(wú)熱處理?xiàng)l件，可在施工后常溫養(yǎng)護(hù) 1 個(gè)月。韶關(guān)E08固化劑廠商</p><p> 樹(shù)脂的固化度對(duì)制品性能的影響 </p> <p> 經(jīng)過(guò)理論和實(shí)踐測(cè)試表明： </p> <p> ①、樹(shù)脂的固化度越高其彎曲強(qiáng)度及模量越大； </p> <p> ②、樹(shù)脂的固化度越高其制品的耐腐蝕性越好； </p> <p> ③、樹(shù)脂的固化度越高制品耐熱性能越好； </p> <p> ④、拉伸強(qiáng)度和斷裂延伸率的比較大值出現(xiàn)在樹(shù)脂固化度為 90%左右。 </p> <p> UPR 的固化是一個(gè)復(fù)雜的化學(xué)過(guò)程，受很多因素的影響，因此，無(wú)論是 UPR 生產(chǎn)廠家，還是應(yīng)用廠家都應(yīng)掌握一些 UPR 基本的固化常識(shí)，才能在安全生產(chǎn)、提高生產(chǎn)效率的基礎(chǔ)上，針對(duì)自身產(chǎn)品的特點(diǎn)，有效地解決實(shí)際生產(chǎn)中出現(xiàn)的各種問(wèn)題。相信隨著應(yīng)用廠家對(duì)樹(shù)脂的固化常識(shí)的不斷深入了解，他們生產(chǎn)的產(chǎn)品質(zhì)量將會(huì)有質(zhì)的飛躍。 </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> 韶關(guān)E08固化劑廠商</p><p style="text-indent:25px">江陰泉林化學(xué)品有限公司致力于化工，是一家生產(chǎn)型公司。公司自成立以來(lái)，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下不飽和聚酯樹(shù)脂不飽和樹(shù)脂，乙烯基樹(shù)脂，樹(shù)脂，膠衣，玻璃纖維紗，玻璃纖維布，固化劑促進(jìn)劑，環(huán)氧固化劑深受客戶的喜愛(ài)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠(chéng)信為本的理念，打造化工良好品牌。江陰泉林憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來(lái)的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3062549.html</p></div></div></div></div></div><div id="2l2nieb" class="page-right twoColRt"><div id="kzwikwt" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div 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