缩聚阶段物质的量比对高浓度甲醛制备UF树脂性能的影响  

Effects of Mole Ratio of Acid Stage on Performance of UF Resin Prepared from High Concentration Formaldehyde

作　　者：吴志刚[1] 曹明[1] 席雪冬[1] 王辉[1] 熊文[1] 沈高丽 杜官本[1] 

机构地区：[1]西南林业大学云南省木材胶黏剂及胶合制品重点实验室,云南昆明650224

出　　处：《上海化工》2015年第9期9-13,共5页Shanghai Chemical Industry

基　　金：云南省教育厅项目(2014Y318);西南林业大学科研启动项目(111421);林业公益性行业科研专项(201304505);"十二五"国家科技支撑计划项目(2012BAD24B03)

摘　　要：以高浓度甲醛制备脲醛(UF)树脂,研究了缩聚反应阶段物质的量比[n(甲醛)∶n(尿素)]和固化剂类型对最终树脂胶接性能和耐热性能的影响。研究结果表明:以NH4Cl或NH4Cl+尿素作为固化剂时,随着缩聚阶段物质的量比逐渐降低,树脂强度都呈先增后减的趋势,n(甲醛)∶n(尿素)=1.37∶1时,树脂类表现出较高的储存模量,且后者比前者提高近46%,但最终树脂的耐热性能均不佳;以甲酸作为固化剂时,树脂的胶接性能和耐热性均不好。Using high concentration formaldehyde to prepare urea formaldehyde（UF） resin, the effects of mole ratio of formaldehyde to urea of acid stage and the curing agent types on the bonding performance and thermal stability of UF resin were studied. The results showed that when NH4 Cl or NH4 Cl and urea were used as curing agent, the strength of resin increased initially but then decreased with decreasing the mole ratio. When the mole ratio of acid stage was 1.37 ∶1,resins had high storage moduli, and the storage moduli of the latter was 46% higher than that of the former, but the thermal stabilities were poor. When formic acid was used as curing agent, the resin obtained had poor bonding performance and thermal stability.

关 键 词：高浓度甲醛 脲醛 固化剂 胶合性能 耐热性能 

分 类 号：TQ433.431[化学工程]