酸性条件下脲醛树脂中不稳定结构的研究  

Studies on Unstable Structures in Urea-formaldehyde Resins Prepared in Strong Acid Medium

作　　者：李爱萍[1] 阚成友[1] 杜奕[1] 刘德山[1] 

机构地区：[1]清华大学化工系高分子研究所

出　　处：《高等学校化学学报》2006年第9期1782-1784,共3页Chemical Journal of Chinese Universities

基　　金：国家'八六三'计划项目(批准号:2001AA242041)资助

摘　　要：氨基树脂是一类具有广泛应用的高分子材料，其中由尿素和甲醛合成的脲醛树脂（Urea—formaldehyde，UF）水溶液，由于其价格低廉和制作简便，在木材加工中作为粘合剂应用至今．脲醛树脂及其制备的产品在使用过程中会不断地释放出甲醛，污染环境，严重危害人的身体健康．The variations of unstable structures in the synthesized urea-formaldehyde （UF） resin systems with the change of the molar ratios of formaldehyde to urea were discussed by ^13C NMR spectroscopy. The results show that the relative contents of dimethylene ether groups, methylols and unreactive formaldehyde increased gradually with the increase of the molar ratios of formaldehyde to urea from 0. 5 to 3.0, which implied that the structure of UF resins can be optimized by controlling the molar ratios of formaldehyde to urea in the process of synthesizing UF resin. It is optimal for the molar ratios of formaldehyde to urea in the range of 1.5 to 2.0, as evidenced by small amounts of unstable structures and significant amounts of stable structures in UF resins prepared.

关 键 词：脲醛树脂 不稳定结构 ^13C NMR 摩尔比 

分 类 号：O631[理学—高分子化学]