摘要
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。
The urea-formaldehyde resin with microcontent of free formaldehyde was synthesized using urea, formaldehyde as raw materials and the melamine/polyhydroxy additive system as formaldehyde scavenger. The content of the free formaldehyde in the urea-formaldehyde resin enhanced and the viscosity of the resin decreased with increasing the formaldehyde/urea （F/U） molar ratio. With increasing the melamine and polyhydroxy additive respectively, the content of the free formaldehyde dropped and the viscosity increased. The content of the free formaldehyde was lower than 10 mg/kg, far below the European E1 standard, when F/U molar ratio was 1.06, the dosage of melamine was 1%, the dosage of polyhydroxy additive was 1.5 %. During the synthesis process, the formaldehyde and melamine were one-off added, while urea and polyhydroxy additive were added in batches under the corresponding condition.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第2期128-130,共3页
Polymer Materials Science & Engineering
基金
2010年国家大学生创新性实验计划项目
2010年江苏省高等学校大学生实践创新训练计划项目
2010年南京大学大学生创新训练计划重点项目
关键词
脲醛树脂
改性
三聚氰胺
多羟基添加剂
游离甲醛
urea-formaldehyde resin
modification
melamine
polyhydroxy additive
free formaldehyde
