摘要
在常规脲醛树脂制备工艺基础上,成功制备了树脂型甲醛捕捉剂。借助13C-NMR和GPC分析方法,研究了甲醛捕捉剂的结构特点及分子质量分布。将其与自制的低物质量比脲醛树脂混合使用,考查了甲醛捕捉剂对脲醛树脂性能的影响。结果表明,该甲醛捕捉剂不含游离甲醛,已实现一定程度的树脂化。甲醛捕捉剂中大量游离尿素及一羟甲基脲等低分子质量物质的存在能有效降低刨花板的甲醛释放量,但对混合树脂的最终强度不利。添加甲醛捕捉剂对脲醛树脂的固化行为影响较小。当脲醛树脂与甲醛捕捉剂质量比为85/15、热压时间为4min时,刨花板性能较佳。
On the basis of preparation procedure of normal urea-formaldehyde （UF） resin, a UF resin-based formaldehyde scavenger was gotten. By 13C-NMR and GPC, molecular structure and molecular weight distribution of this formaldehyde catcher were characterized. The formaldehyde scavenger was mixed with a basic UF resin adhesive with lower F/U molar ratio and its effects on performance UF resin were analyzed. The results showed that there was no free formaldehyde in the scavenger and a UF polymer was built up to some degree. A large quantity of free urea and mono-methylolurea in the scavenger can decrease the formaldehyde emission of final panels. However, it would do bad to the strength performance. The formaldehyde scavenger had no effects on the curing temperature of the basic UF resin. Lab-prepared particleboard where the proportion of the components UF resin/ scavenger was 85/15 by weight and the pressing time was 4 minutes showed a better performance.
出处
《粘接》
CAS
2011年第3期40-43,共4页
Adhesion
基金
国家自然科学基金青年项目(30800870)
教育部科学技术研究重点项目(210205)
关键词
甲醛捕捉剂
结构
分子质量
formaldehyde scavenger
structure
molecular weight
