The good method to analyze the structural changes of reaction process of melamine modified UF resin by the traditional process alkali-acid-alkali is 13C-NMR.It can also extrapolate potential reaction.

• 摘要通过13C-NMR可以很好地解析采用传统工艺（碱-酸-碱工艺）合成三聚氰胺改性脲醛树脂反应过程中的结构变化，并可推测其发生的反应。