2-甲基咪唑封闭型水性多异氰酸酯的合成及表征  

Synthesis and characterization of 2-methylimidazole blocked waterborne polyisocyanate

作　　者：李阿峰[1] 樊国栋[1] 李会宁 陈华[1] 赵琪[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021 [2]肇庆千江高新材料科技有限公司,广东肇庆526238

出　　处：《热固性树脂》2013年第2期18-22,共5页Thermosetting Resin

基　　金：陕西省科技攻关项目(2008K07-32);陕西省教育厅重点实验室重点科研计划项目(09JS061);陕西科技大学研究生创新基金资助

摘　　要：将基于TDI的多异氰酸酯与二羟甲基丙酸(DMPA)反应,再用三乙胺(TEA)中和成盐及2-甲基咪唑(2-MI)封端后,制得一种水分散性封闭多异氰酸酯(WBI)。研究了封闭时间对封闭率的影响,采用FT-IR对封闭反应过程进行跟踪,通过TGA、DSC研究了其解封温度。结果表明,封闭反应的适宜条件为:2-MI与—NCO物质的量比为1.1～1.2∶1;反应温度60℃;反应时间2.5 h,解封温度为125.6～137.8℃。将WBI作为涂料固化剂可明显改善漆膜性能。The waterborne blocked polyisocyanate（WBI） was prepared by reaction of TDI-based polyisocyanate and 2,2-bis（hydroxylmethyl） propionic acid（DMPA）,neutralization with triethylamine（TEA） and blocking with 2-methylimidazole（2-MI）.The effect of reaction time on blocked ratio was investigated.The blocking reaction process was tracked by FT-IR and the deblocked temperature was studied by TGA and DSC.The results showed that the suitable conditions of the blocking reaction were as followed： molar ratio of 2-MI to—NCO 1.1-1.2∶ 1,reaction temperature 60 °C,reaction time 2.5 h and deblocked temperature 125.6-137.8 °C.The coating film properties could be significantly improved by using WBI as the paint curing agents.

关 键 词：2-甲基咪唑 水性异氰酸酯 合成 封闭 解封 涂料 固化剂 

分 类 号：TQ630.4[化学工程—精细化工]