封闭异氰酸酯与低毒脲醛树脂固化反应特性的探究  

On curing reaction characteristics of low-toxicity urea-formaldehyde resins containing blocked isocyanate

作　　者：朱丽滨[1] 顾继友[1] 张彦华[1] 

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《粘接》2008年第3期1-4,共4页Adhesion

基　　金：教育部博士点基金项目(项目号:20050225011)

摘　　要：对不同固化体系下低毒脲醛树脂以及其与封闭异氰酸酯反应的固化速度、适用期及pH值变化情况进行了研究。结果表明,单组分固化体系中,硫酸铝固化速度最快。磷酸与氯化铵组成的双组分固化体系,固化速度虽然很快,但适用期较短;乌洛托品对延长脲醛树脂胶的适用期效果较好。加入封闭异氰酸酯后会加快脲醛树脂固化速度,但其适用期有所缩短,而在硫酸铝和磷酸的固化体系中不明显。pH值在15 min内下降较快,30 min之后趋于稳定。Gelation time, pot life and pH value of the low-toxicity urea-formaldehyde （UF） resins containing blocked isocyanate during curing were studied in different curing systems. In single curing system, the gelation time is the most quick for aluminium sulfate. In binary curing system of phosphate and ammonium chloride, although the gelation time is fast, but the pot life is short, urotropine is excellent for prolonging pot life. When adding blocked isocyanate,it will accelerate the gelling reaction of UF, but shorten the pot life, and the phenomenon is not evidence in aluminium sulfate and phosphate, pH value dropped quickly during 15 minutes and it went to stabilization after 30 minutes.

关 键 词：固化体系 脲醛树脂 封闭异氰酸酯 

分 类 号：TQ433.431[化学工程]