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#f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>溫州樹脂與固化劑促進(jìn)劑比例,固化劑</p><p><span>***更新：</span>2021-02-03 11:11:46</p><p><span id="click" >瀏覽次數(shù)：7次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="btnjpvz" 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="n79n975" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="pvrfjxv" class="box"><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，溫州樹脂與固化劑促進(jìn)劑比例，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，溫州樹脂與固化劑促進(jìn)劑比例，容易使樹脂著色，溫州樹脂與固化劑促進(jìn)劑比例。 </p> <p> <br /> 80℃下 4 小時進(jìn)行處理，（如果有條件可于 100-120℃處理 2 小時效果更佳）。溫州樹脂與固化劑促進(jìn)劑比例</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="溫州樹脂與固化劑促進(jìn)劑比例,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637281088517138672/3325203.png"></div><p> 不飽和樹脂固化過程的表觀特征變化 </p> <p> 不飽和聚酯樹脂的固化過程可分為三個階段，分別是： </p> <p> ①、凝膠階段（A 階段）：從加入固化劑、促進(jìn)劑以后算起，直到樹脂凝結(jié)成膠凍狀而失去流動性的階段。該結(jié)段中，樹脂能熔融，并可溶于某些溶劑（如乙醇、**等）中。這一階段大約需要幾分鐘至幾十分鐘 </p> <p> <p> ②、硬化階段（B 階段）：從樹脂凝膠以后算起，直到變成具有足夠硬度，達(dá)到基本不粘手狀態(tài)的階段。該階段中，樹脂與某些溶劑（如乙醇、 **等）接觸時能溶脹但不能溶解，加熱時可以軟化但不能完全熔化。這一階段大約需要幾十分鐘至幾小時。 </p> <p> ③、熟化階段（C 階段）：在室溫下放置，從硬化以后算起，達(dá)到制品要求硬度，具有穩(wěn)定的物理與化學(xué)性能可供使用的階段。該階段中，樹脂既不溶解也不熔融。我們通常所指的后期固化就是指這個階段。這個結(jié)段通常是一個很漫長的過程。通常需要幾天或幾星期甚至更長的時間。 </p> 鹽城環(huán)氧樹脂與固化劑哪家好鏈終止——兩個游離基結(jié)合，終止了增長著的聚合鏈。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="溫州樹脂與固化劑促進(jìn)劑比例,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286280191572266/1979418.png"></div><p> 二氨基二苯基甲烷 DDMHT-972 DEH-50 [（NH2）（CH3）C6H4 ]2CH2 分子量196 活潑氫當(dāng)量49 白色結(jié)晶長期暴露在日光下呈褐色熔點89℃ 每100份標(biāo)準(zhǔn)樹脂用25-30份固化60℃2小時 +150℃2小時。適用期500克50℃3小時熱變形溫度145-150℃ 抗彎強(qiáng)度1190kg/cm2，抗壓強(qiáng)度710kg/cm2，抗拉強(qiáng)度550kg/cm2，伸長率4.4%，沖擊強(qiáng)度0.3-0.5尺-磅/寸洛氏硬度106。介電常數(shù)（50赫23℃）4.4 功率因數(shù)（50赫23℃）0.004 體積電阻大於1015Ω.cm耐熱、耐腐蝕性優(yōu)，電性能好,毒性小。耐熱、機(jī)械強(qiáng)度高。因是固體，使用不方便，與樹脂加熱混合時需注意防止凝膠。 </p> <p> 二氨基二苯基砜 DDSHT-976 [（NH2）C6H4 ]2SO2 分子量248 活潑氫當(dāng)量62 熔點175℃ 每100份標(biāo)準(zhǔn)樹脂用35-40份固化130-150℃3天-2小時。適用期500克130℃1.5小時通常以BF3-胺絡(luò)合物為促進(jìn)劑（用量為0.5-2%) 熱變形溫度175-190℃ 抗彎強(qiáng)度1220kg/cm2，抗壓強(qiáng)度710kg/cm2，抗拉強(qiáng)度580kg/cm2，伸長率3.3%，沖擊強(qiáng)度0.3-0.5尺-磅/寸洛氏硬度110。耐熱、耐腐蝕性優(yōu)，電性能好,毒性小。反應(yīng)慢。耐熱175℃。 </p><p> 不飽和聚酯樹脂的固化，是指樹脂從液態(tài)轉(zhuǎn)變?yōu)楣虘B(tài)的過程，這是用不飽和聚酯樹脂制造產(chǎn)品的必經(jīng)過程。這個過程可以在加熱加壓下完成，也可以在不經(jīng)加熱的情況下完成（冷固化）。從表面上看，是從可流動的液體變成堅硬的固體，但從化學(xué)上看，是從線型分子結(jié)構(gòu)轉(zhuǎn)變成體型分子結(jié)構(gòu)的過程。 </p> <p> 常用的不飽和聚酯樹脂主要由線型不飽和樹脂和活性單體（一般是苯乙烯）兩部分組成。兩者都含有不飽和鍵，在一定的條件下（例如加入過氧化物引發(fā)劑、加熱、受紫外線照射等），就能進(jìn)行自由基共聚和反應(yīng)。這種反應(yīng)實在按照鏈引發(fā)、鍵增長和鏈終止的歷程進(jìn)行的。在這一過程中伴隨著熱量的放出，液體樹脂的粘度迅速增大，硬度提高，**終變成了既不溶解也不熔融的固體。根據(jù)需要在成型過程中可以加入增強(qiáng)材料如玻璃纖維，也可以不加增強(qiáng)材料，只加（或不加）不同的填料，前者即得到我們通常所說的玻璃鋼，后者可以制成人造大理石，人造瑪瑙等制品或作為表面涂層使用由線型長鏈分子形成三維立體網(wǎng)絡(luò)結(jié)構(gòu)的過程。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="溫州樹脂與固化劑促進(jìn)劑比例,固化劑" src="https://tyunfile.71360.com/WaterMark/UploadFile/Jyquanlin/637286279982451172/4578712.png"></div><p> 不飽和聚酯樹脂的固化是線性大分子通過交聯(lián)劑的作用，形成體型立體網(wǎng)絡(luò)過程，但是固化過程并不能消耗樹脂中全部活性雙鍵而達(dá)到完全的固化度。也就是說樹脂的固化度很難達(dá)到完全。其原因在于固化反應(yīng)的后期，體系粘度急劇增加而使分了擴(kuò)散受到阻礙的緣故。 </p> <p> 一般只能根據(jù)材料性能趨于穩(wěn)定時，便認(rèn)為是固化完全了。樹脂的固化程度對玻璃鋼性能影響很大。固化程度越高，玻璃鋼制品的力學(xué)性能和物理、化學(xué)性能得到充分發(fā)揮。（有人做過實驗，對 UPR 樹脂固化后的不同階段進(jìn)行物理性能測試，結(jié)果表明，其彎曲強(qiáng)度隨著時間的增長而不斷增長，一直到一年后才趨于穩(wěn)定。而實際上，對于已經(jīng)投入使用的玻璃鋼制品，一年以后，由于熱、光等老化以及介質(zhì)的腐蝕等作用，機(jī)械性能又開始逐漸下降了。） </p> <p> 影響固化度的因素有很多，樹脂本身的組分，引發(fā)劑、促進(jìn)劑的量，固化溫度、后固化溫度和固化時間等都可以影響聚酯樹脂的固化度。 </p> <p> <br /> 在同樣成分下，大制件相對小制件熱損失少，溫升就較高。鹽城環(huán)氧樹脂與固化劑哪家好</p><p style="text-indent:25px">熟化階段：在室溫下放置，從硬化以后算起，達(dá)到制品要求硬度，具有穩(wěn)定的物理與化學(xué)性能可供使用的階段。溫州樹脂與固化劑促進(jìn)劑比例</p><p> 乙二胺 EDA H2NCH2CH2NH2 分子量60 活潑氫當(dāng)量15 無色液體每100份標(biāo)準(zhǔn)樹脂用6-8份性能：0、有剌激臭味，揮發(fā)性大、粘度低、可室溫快速固化。用于粘接、澆注、涂料。該類胺隨分子量增大，粘度增加，揮發(fā)性減小，毒性減小，性能提高。但它們放熱量大、適用期短。一般而言它們分子量越大受配合量影響越小。長期接觸脂肪多元胺會引起皮炎，它們的蒸汽毒性很強(qiáng)，操作時須十分注意。 </p> <p> 二乙烯三胺 DETA H2NC2H4NHC2H4NH2 分子量103活潑氫當(dāng)量20.6 無色液體每100份標(biāo)準(zhǔn)樹脂用8-11份。固化：20℃2小時+100℃30分鐘或20℃4天。性能：適用期50克25℃45分鐘，熱變形溫度95-124℃，抗彎強(qiáng)度1000-1160kg/cm2，抗壓強(qiáng)度1120kg/cm2，抗拉強(qiáng)度780kg/cm2，伸長率5.5%，沖擊強(qiáng)度 0.4尺-磅/寸洛氏硬度99-108。介電常數(shù)（50赫、23℃）4.1 功率因數(shù)（50赫、23℃）0.009 體積電阻2x1016 Ω-cm 常溫固化、毒性大、放熱量大、適用期短溫州樹脂與固化劑促進(jìn)劑比例</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。江陰泉林深耕行業(yè)多年，始終以客戶的需求為向?qū)?，為客戶提?**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(jìn)劑，環(huán)氧固化劑。江陰泉林致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對用戶產(chǎn)品上的貼心，為用戶帶來良好體驗。江陰泉林始終關(guān)注自身，在風(fēng)云變化的時代，對自身的建設(shè)毫不懈怠，高度的專注與執(zhí)著使江陰泉林在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3143331.html</p></div></div></div></div></div><div id="pnoev3j" class="page-right 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