弱酸性条件起始合成脲醛树脂的工艺研究

The synthetic technology of urea-formaldehyde resin with weak acidity initial condition

对按设计工艺合成的脲醛树脂进行了性能测定,采用化学和红外方法分析了树脂的官能团,并定性分析了几种树脂固化过程中的热行为,结合实验现象分析了从弱酸性起始合成脲醛树脂的工艺特点。证明从弱酸性起始可以合成具有良好工艺性能的脲醛树脂;合成工艺与传统工艺相比有成本优势;通过工艺的完善可以控制制品的甲醛释放;采用该类工艺能够合成出适合冷固化的木材胶粘剂。

The paper discussed the technological properties of urea-formaldehyde（UF）resins synthesized under weak acidity condition, based on the observation of resin structures by IR and thermal behavior by DSC. It was indicated that UF resin with weak acidity condition at initial synthetic stage had better technological properties, and more cost advantage than traditional synthesis. The formaldehyde release of UF bonded products could be controlled by technological improvement. In addition, the technology studied could synthesize wood adhesive that cured under room temperature.