| 脲醛树脂改性工艺中的酸度条件控制 |
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| 引用本文： | 徐红,张东翔.脲醛树脂改性工艺中的酸度条件控制[J].中国胶粘剂,2002,11(4):21-23. |
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| 作者姓名： | 徐红 张东翔 |
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| 作者单位： | 重庆大学,化学化工学院,重庆市,400044 |
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| 摘 要： | 普通脲醛树脂及氧化淀粉改性脲醛树脂的合成工艺中 ,酸度控制条件对合成产物稳定性、剪切强度、游离甲醛含量等性能影响的研究表明 ,缩合反应阶段尿素投入时体系pH值对脲醛树脂合成过程以及产物稳定性都有显著性影响。缩合阶段体系的pH值控制范围直接影响脲醛树脂的稳定性、粘合强度与游离甲醛含量。从脲醛树脂稳定性考虑 ,投入第三批尿素后的pH值应控制在 6 .0以上
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| 关 键 词： | 脲醛树脂 氧化淀粉 酸度 贮存稳定性 游离甲醛 |
| 文章编号： | 1004-2849(2002)04-0021-03 |
| 修稿时间： | 2001年7月24日 |
Study on acidity condition control in improving properties of urea-formaldehyde(UF) resins |
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| XU Hong,ZHANG Dong xiang.Study on acidity condition control in improving properties of urea-formaldehyde(UF) resins[J].China Adhesives,2002,11(4):21-23. |
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| Authors: | XU Hong ZHANG Dong xiang |
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| Abstract: | In this paper, the influence of acidity control condition on stability, shear strength and free formaldehyde content of synthesis product in common UF resins synthesis process and in oxidation starch improving the properties of UF resins synthesis process was discussed. The experimental results show that in the condensation reaction pH value of system has remarkable influence on the synthesis process of UF resins and stability of its product when urea was added. pH value range of system directly influence resin stability, bond strength and free formaldehyde content. Taking account of stability of UF resins. the pH value should be controlled above 6.0 after the third batch urea was added. |
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| Keywords: | urea formaldehyde resins acidity oxidation starch storage stability free fromaldehyde |
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