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id="article" class="ArticleTencont"> <p> <span style="font-family:SimSun;font-size:16px;">    贵州<a href="/product925345.html" target="_blank"><strong>泡沫</strong></a>的制作原材料如下:</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">    1、环氧树è„?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">    多选用双酚A型环氧树脂,环氧å€?.51ï½?.22mol/100g。黏åº?5℃时ä¸?0Pa·sï¼?30℃时黏度ä¸?Pa·sã€?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     2、固化剂</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     可选用环氧树脂的各种固化剂ã€?/span> </p> <p> <br /> </p> <p> <span style="font-family:SimSun;font-size:16px;">     3、发泡剂</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     环氧树脂用的发泡剂有物理发泡剂和化学发泡剂两类。物理发泡剂主要为低沸点液体,如三氯氟甲çƒ?F11)、三氯三氟乙çƒ?F112)、二氯二氟甲çƒ?F12)等。利用环氧树脂的固化热使低沸点液体蒸发,释放气体而发泡,制得的产品密度小,热导率低。但是含氟碳氢化合物对大气环境有破坏作用,通常用于喷涂发泡工艺。据中国环氧树脂行业协会专家介绍,甲苯等可作为辅助发泡剂。除能发泡外,还起固化反应热吸收剂和稀释剂的作用ã€?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     化学发泡剂主要是偶氮类有机化合物,如偶氮二甲酰胺(ADCA或AC)ã€?ï¼?â€?偶氮二异丁腈(AIBN)重氮胺基è‹?DAB)等。这种发泡剂价格便宜,分解产物无毒、无臭、无色。此外还有磺酰肼类,å¦?ï¼?â€?氧代双苯磺酰è‚?OBSH)等。选用时应注意分解温度。常用化学发泡剂的性能简介如下:</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     偶氮二甲酰胺(AC,ADCA)。桔黄色结晶粉末ã€?20℃以上分解产生大量气ä½?N2,CO及少量CO2),标准状态下发气é‡?00ï½?00mL/g,为高效泡剂ã€?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     2ï¼?â€?偶氮二异丁腈(AIBN,AZDN,ABN),白色结晶粉末,98ï½?10℃分解放出N2,发气量(标准状态下)130ï½?50mL/g。室温下缓慢分解,应åœ?0℃以下存放ã€?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     4ï¼?â€?氧代双苯磺酰è‚?OBSH)。白色或淡黄色结晶粉末。在树脂ä¸?20ï½?40C分解放出N2和水蒸气。发气量çº?20 mL/g 100℃以下不分解,加工安全性好。碳酸氢钠可使它活化,降低分解温度。泡孔结构细微均匀ã€?/span> </p> <p> <br /> </p> <p> <span style="font-family:SimSun;font-size:16px;">     4、表面活性剂(泡沫稳定å‰?</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     能降低液体的表面张力,有利于泡沫的稳定泡孔均匀。环氧树脂发泡用的表面活性剂有:聚氧乙烯山梨糖醇酐月桂酸é…?吐温20),聚二甲基硅氧烷-聚氧化烯烃共聚物,环氧乙çƒ?环氧丙烷嵌段共聚ç‰?L-64)ã€?/span> </p> <p> <br /> </p> <p> <span style="font-family:SimSun;font-size:16px;">     5、填æ–?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     加入填料能降低成本,减小固化放热峰强度和收缩率,改善表观质量,提高耐化学性。常用的有滑石粉、石英粉、空心微球等。但滑石粉和石英粉会使泡沫塑料的密度增大,力学性能降低。松散密度很小的空心微球是一种理想的填料。分有机材料和无机材料两类。无机微球如玻璃空心微球、陶瓷空心微球;有机微球如酚醛空心微球、脲甲醛实心微球,可发性聚苯乙烯微粒。一般地说,无机微球用作环氧泡沫塑料的填料更有效。它能提高泡沫塑料的强度、耐热性、尺寸稳定性和表面光滑性。在发泡固化过程中会发生微球上浮现象,所以需添加适量触变剂ã€?/span> </p> <p> <br /> </p> <p> <span style="font-family:SimSun;font-size:16px;">     6、触变剂</span> </p> <p> <span style="font-family:SimSun;font-size:16px;">     常用的触变剂有膨润土、硅藻土、石棉、云母、有机络合物、金属皂粉和固体植物油等,可使泡沫及微球位置稳定,防止上浮,分层ã€?/span> </p> <p style="text-align:center;"> <span style="font-family:SimSun;font-size:16px;"><img src="/img.ashx?shopid=21466&file=20161008111125_4114.jpg" alt="" /><br /> </span> </p> </div> <div class="clear"></div> <div class="tag"> 相关标签ï¼?a href='/news.html?key=贵州泡沫'>贵州泡沫</a>, </div> <div class="reLink clearfix"> <div>上一条:<a href="news1098535.html">贵阳泡沫的发泡方法介ç»?/a></div><div>下一条:<a 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