水分散聚氨酯交联剂的制备及解封过程的原位FTIR跟踪  

Preparation and in-situ FTIR detection of deblocked process for waterborne polyurethane crosslinking agent

作　　者：李敏婷[1] 刘吉文[2] 刘晓丹[1] 董慧民[1] 李再峰[1] 

机构地区：[1]青岛科技大学生态化工教育部重点实验室,山东青岛266042 [2]青岛科技大学橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《弹性体》2011年第1期10-14,共5页China Elastomerics

基　　金：山东省自然科学基金(Y2008B08);山东省教育厅科技发展计划(J08LC08);中国博士后基金特别资助项目(200902576)

摘　　要：以异佛尔酮二异氰酸酯(IPDI)、N-甲基二乙醇胺(MDEA)和丁酮肟(MEKO)为原料,制备出水分散封端型聚氨酯交联剂。采用NMR法优化了亲水剂MDEA扩链反应的最佳反应时间;用"原位FTIR"跟踪了交联剂的解封过程。实验结果表明:当亲水扩链的反应时间为60 min,亲水扩链反应完全;当温度高于70℃,分子间的氢键化作用遭到严重破坏,相关特征官能团(—NH和—C O)的谱带位置移向高波数;当温度达到120℃时,交联剂的活性基团NCO开始解封出来,参与交联反应。A waterborne polyurethane crosslinking agent was synthesized with isophorone diisocyanate（IPDI） as initial materials,N-methyl diethanolamine（MDEA） as the hydrophilic chain-extender and methyl-ethyl ketoxime as blocking agents.The proper extension reaction time of MDEA hydrophilic chain extension was discussed by NMR,and the deblock process of waterborne polyurethane crosslinking agent was detected by in-situ FTIR.The results showed that the proper extension reaction time of 60 mins was determined by NMR.When the temperature was over 70℃,the bands sites,such as NH and —CO groups associated with hydrogen bond interaction,shifted to the higher wavenumbers,and the NCO groups were de-blocked and to participate in crosslinking reaction at or above 120℃.

关 键 词：聚氨酯 交联剂 解封 原位FTIR 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]