尿素和甲醛为原料,三聚氰胺/多羟基添加剂复合体系为甲醛捕捉剂制备了微甲醛含量的脲醛树脂.甲醛/尿素(F/U)物质的量比增大,脲醛树脂中的游离甲醛含量上升、树脂黏度下降.分别增加三聚氰胺和多羟基添加剂用量,脲醛树脂中的游离甲醛含量降低、树脂黏度增大.当甲醛/尿素物质的量比为1.06,三聚氰胺用量为1％(质量分数,下同),多羟基复合添加剂用量为1.5％时,以及采用一次性加入甲醛和三聚氰胺、分批次加入尿素和多羟基添加剂的合成工艺与相应条件,制备的脲醛树脂中的游离甲醛含量低于10 mg/kg,远低于欧洲的E1级指标.
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