脲醛改性呋喃树脂外观和性能的影响因素研究.pdfVIP

学兔兔 Mar．2011 VO1．60 NO．3 脲醛改性呋喃树脂外观和性能的影响因素研究 高红梅 ，黄仁和 ，伊 宁 ，邱学明 (1．山东科技大学化学与环境工程学院，山东青岛266510；2．济南铜铁总公司山东济南250101) 摘要：研究了脲醛改性呋喃树脂制各过程中加盛阶段甲醛与尿素的肇尔比 (F／U)，加成及缩聚阶段的pH值、反应温 度、反应时Iq等因素对树脂外观和性能的影响，分析了导致树脂浑浊、分层、放置出现沉淀的原因，总结了备工艺条 件与牛对脂性能的关系。制各出了树脂砂强度高、外观透明、储存稳定性较好的树脂。 关键词：脲醛改性呋哺树脂；外观稳定性；游离醛 中图分类号：TG221文献标识码：A 文章编号：1001—4977(2011)03—0294—05 Study on Factors Influence Appearance Stability and Properties of Furan Resin Modified by Urea．Formaldehyde GAO Hong—mei’，HUANG Ren—he’，YI Ning’，QlU Xue—ming (1．College of Chemical and Environmental Engineering，Shandong University of Technology and Science，Qingdao 26651 0，Shandong，China；2．Jinan Iron＆Steel Group Corporation， Jinan 2501 01，Shandong，China) Abstract：The factors that affect the appearance stability and properties of urea．formaldehyde modified furan resin during the preparation process were studied，such as the molar ratio of formaldehyde—to—urea(F／U)jn addition stage，the pH values，reaction temperature and reaction time in addition and condensation stages．The reason that lead to the turbidity．Iayered and precipitation of the resin was analyzed，and the relationship between process conditions and the properties of resin was summarized．Finally．the lransparent uniform resin with good appearance stability was prepared． Key WOrds：furan resin modified by urea—formaldehyde；appearance stability；free．formaldehyde 酸固化脲醛改性呋喃树脂又称自硬呋哺树脂， 分层、沉淀的原因，总结了各工艺条件与树脂性能 是由尿素、甲醛和糠醇经缩聚而成的一种用于铸造 的关系，在不降低呋哺树脂砂强度和使用性能的前 的有机粘结剂，具有耐高温性能好、透气性强、黏 提下，制备出了透明性和稳定性好，含水量高，成 结强度高、溃散性好、树脂砂的再生同用性好等特