纤维板用微游离醛脲醛树脂的制备工艺研究  

Study on Preparation Process of Urea-Formaldehyde Resin with Micro-Free Formaldehyde for Application in Fiber Board

作　　者：刘建武[1,2] 郭成[1] 张跃[2] 邱俊 沈介发[2] 严生虎[2] 陈代祥[2] 李春涛 

机构地区：[1]南京工业大学理学院,江苏南京211800 [2]常州大学制药与生命科学学院,江苏常州213164 [3]南通广泰生化制品有限公司,江苏海安226600

出　　处：《常州大学学报（自然科学版）》2016年第1期48-53,共6页Journal of Changzhou University：Natural Science Edition

基　　金：国家科技支撑计划课题(2011BAE19B02);中国石油化工集团公司委托开发项目(LZ10018)

摘　　要：采用弱碱-弱酸-弱碱工艺，以尿素、甲醛为原料，二乙醇胺、三聚氰胺为改性剂，尿素与甲醛“分批加入，多点分段”控制反应过程，进行脲醛树脂游离甲醛含量减量化的实验。通过单因素实验，考察F／u物质的量比、pH、温度、改性剂等对脲醛树脂胶粘剂游离甲醛含量和性能的影响。结果表明，在甲醛／尿素物质的量比为1．2：1，加成反应pH为7．5～8．5，加成反应温度为90～95℃，缩聚反应pH为4．5～5．5，缩聚反应温度85～90℃条件下，添加0．5％（wt．）的二乙醇胺和3％（wt．）的三聚氰胺为改性剂，制得的环保型纤维板用脲醛树脂具有微甲醛释放、耐水性能好、无公害、污染小、绿色环保等特点，其性能技术指标达到E0级标准。Weak alkali-weak acid-weak alkali process was used in this research. Using urea and formaldehyde as starting material, diethanolamine and melamine as modifier, urea-formaldehyde resin was synthesized by the process of ＂added in batches, multi-point section＂, which was controlled to decrease the free formaldehyde. Individual factor experiments were carried out to study the influence of the F/U molar ratio, pH, temperature, modifier and so on. The result showed that, at optimized conditions when the mole ratio of formaldehyde upon urea at 1.2： 1, the pH of addition reaction in 7.5--8. 5, the addition tem- perature in 90--95℃, the pH of polycondensation in 4. 5--5.5, the polycondensation temperature in 85-- 90℃, the respective amount of diethanolamine and melamine at 0. 5%and 3% （wt.）, the optimum condi- tion was obtained with micro formaldehyde emission and good water-proof property. Finally, this process could reach pollution-free, green and friendly-environment for fiber board, the resin could reach the na- tional E0 level standard of resin used for fiber board.

关 键 词：脲醛树脂 胶黏剂 微游离醛 

分 类 号：TQ433[化学工程]