加热致活封闭型水性聚氨酯胶束制备与表征  

Preparation and Characterization of Heat-Reducible Blocking Waterborne Polyurethane Micelles

作　　者：邬洪川 李志国[1] 张永良[1] 朱丽滨[1] 顾继友[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：《高分子材料科学与工程》2015年第2期160-164,170,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(31000270);黑龙江省青年自然科学基金资助项目(QC2011C010);中国博士后基金(20100480959;201104406;LBH-10275)

摘　　要：以甲苯二异氰酸酯(TDI)、聚乙二醇(PEG210)和二羟甲基丙酸(DMPA)为主要原料,采用甲乙酮肟(MEKO)封闭端异氰酸酯预聚体制备了封闭型水性聚氨酯胶束。粒度激光光度分析、扫描电镜表明,胶束成近球形状且粒径大小较为均一。红外光谱和差示扫描量热分析表明,MEKO能成功封闭端异氰酸酯,封闭胶束在加热条件下解封闭释放异氰酸基与含活泼氢物质发生交联固化反应,且最高解封闭温度在105~120℃。研究反应条件对胶束粒径及其分布和稳定性影响表明,R值、DMPA含量对粒径影响显著,但粒径大小在20~2000 nm可控;当R小于2.3,DMPA含量大于6%,中和度为100%时,胶束可在水溶液中稳定分散6个月以上。Aqueous polyurethane micelles blocked with methyl ethyl ketoxime(MEKO) were prepared using toluene diisocyanate(TDI),polyethylene glycol(PEG) and dimethylol propionic acid(DMPA). PLAS analysis and SEM observation show that the micelles are nearly spherical particles with uniform particle size distribution. FT-IR and differential scanning calorimetry(DSC) measurements indicate that the isocynate groups could be successfully blocked with MEKO and further be released under heating. The released isocyanate groups could be further crosslinked with aqueous polymers containing active hydrogen,and the maxium deblocking temperature is at 105 ~ 120 ℃. The effect of reaction conditions on the particle size,distribution and stability of micelles was explored,and the results show that R value and the DMPA content have significant influence on the particle size and the stability. The particle size of the micelles could be controlled at the range of 20 ~ 2000 nm,and the paepared micelles could be stably dispersed in aqueous solution above six months under the condition of R less than 2. 3 and the DMPA content more than 6%.

关 键 词：水性聚氨酯胶束 异氰酸酯 封闭 解封闭 稳定性 

分 类 号：TQ317[化学工程—高聚物工业]