甲乙酮肟封闭水性多异氰酸酯的合成及表征  

Synthesis and characterization of methyl ethyl ketone oxime 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,西安710021 [2]肇庆千江高新材料科技有限公司,肇庆526238

出　　处：《化工新型材料》2013年第8期151-153,共3页New Chemical Materials

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：利用甲苯二异氰酸酯(TDI)、三羟甲基丙烷(TMP)与二羟甲基丙酸(DMPA)反应,三乙胺(TEA)中和成盐及甲乙酮肟(MEKO)封端反应后,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,封闭顺序对反应的影响。采用FT-IR、TGA、DSC研究了其解封温度。实验结果表明,甲乙酮肟封闭反应的较好条件为:摩尔比n(MEKO)∶n(-NCO)为1.1～1.2;反应温度为70℃;反应时间3.0h,可实现较完全的封闭,其解封温度为70～128.8℃。作为涂料固化剂可明显改善漆膜性能。The waterborne blocked polyisocyanate was prepared by reaction of TDI,Trimethylolpropane and 2,2-bis（hydroxylmethyl）propionic acid,neutralization with triethylamine and blocking with methyl ethyl ketone oxime.Affect of reaction time on blocked ratio,affect of order of neutralizer on blocking reaction and deblocking temperature were discussed by FT-IR,TGA and DSC.Result s showed that the optimum conditions for the synthesis of blocked polyisocyanates were found as follows：the molar ratio of MEKO/-NCO was from 1.1 to 1.2,the blocking reaction temperature was 70℃,and the blocking reaction time was 3.0 h,the deblocking temperature was 70℃ to 128.8℃,the reaction was complete.Film-forming property can be improved obviously after WBI was used as the curing agent.

关 键 词：甲乙酮肟 水性异氰酸酯 封闭 解封 表征 

分 类 号：O621.3[理学—有机化学]