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采用中间加入起泡剂鼓泡 ,进行气液传质交换的方法 ,合成环保型脲醛胶 ,游离甲醛降到 0 0 5 %以下 ,胶合板胶合强度达 0 7MPa以上 ,并且对板材生产工艺可操作性强 ,其制品甲醛释放量都达到 1 5mg/L(干燥器法 )以下 ,符合GB185 80 -2 0 0 1E1标准要求。红外 (IR)光谱进一步证实 ,气膜法可提高脲醛树脂、尿素中—NH2 的加成反应率以及树脂固化的交联度 ,降低游离甲醛。
Adopting the method of bubbling bubbling in the middle and carrying out gas-liquid mass transfer exchange to synthesize environment-friendly urea-formaldehyde glue, the free formaldehyde is reduced to less than 0 0 5%, the plywood bonding strength is more than 0 7MPa, and the operability Strong, the formaldehyde emission of their products have reached 15mg / L (dryer method) below, in line with GB185 80-2 0 0 1E1 standard requirements. Infrared (IR) spectroscopy further confirmed that the gas film method can improve urea-formaldehyde resin, urea in the -NH2 addition reaction rate and resin curing crosslinking degree, reduce free formaldehyde.