三聚氰胺-苯酚-甲醛共缩聚合成机理及性能研究

为得到环保阻燃等优良性能的防火板，该文在弱碱条件下对三聚氰胺与苯酚、甲醛进行共缩聚得到三聚氰胺-苯酚-甲醛(MPF)树脂，经红外光谱、核磁共振(H1 NMR)分析表明，MPF树脂中显示三嗪环结构特征峰，苯酚环与三聚氰胺的三嗪环主要以亚甲基键(Ph—CH2—N)结构相连存在； TG和DSC的分析显示，MPF树脂具有150、165℃ 2次固化温度。三聚氰胺加入量对树脂游离酚、贮存期以及纸质防火板的燃烧性产生重要影响，对防火板拉伸强度、耐沸水煮性能影响不明显，MPF树脂中甲醛摩尔数直接影响树脂贮存期和防火板的甲醛释放量。 

Copolymerization mechanism and properties of melamine-phenol-formaldehyde resin

In order to produce fireproof board with good properties, such as environmental protection and fire resistance, etc., the synthesis mechanism and properties of melamine-phenol-formaldehyde (MPF) resin which were prepared by melamine, phenol and formaldehyde copolymerization under weak base condition were investigated. According to the characters of FTIR and H1NMR analyses, there was a characteristic peak of triazine ring in MPF resin, and the phenol and triazine rings were mainly joined by the methylene linkage. According to the characters of TG and DSC analyses, MPF resin showed twice curing temperature at 150℃ and 160℃. According to the research on the properties of MPF resin, the quantity of melamine had great effects on the free phenol, storage life of MPF resin and fire resistance of paper fireproof board, and had unobvious effects on the tensile strength and boiling water resistance of paper fireproof board. The molar number of formaldehyde in MPF resin had direct effects on the storage life and formaldehyde emission of paper fireproof board.