核壳型聚氨酯-聚丙烯酸酯复合乳液的合成及流变性能研究

Synthesis of core-shell polyurethane-polyacrylate complex emulsion and its rheological properties

以水性聚氨酯(PU)乳液为种子,甲基丙烯酸甲酯(MMA)、苯乙烯(St)、丙烯酸丁酯(BA)、丙烯酸(AA)等为核层单体,采用半连续种子乳液聚合工艺,合成了具有核壳结构的水性聚氨酯-聚丙烯酸酯(PUA)复合乳液.通过透射电镜(TEM)、差示扫描量热分析(DSC)、傅里叶红外光谱(FTIR)、粒径分析等方法对乳液及其所成乳胶膜的结构和性能进行了测定.另外,还对PUA复合乳液及以其作为粘合剂所制成的数码喷墨印花墨水(乳液墨水)进行了流变性能研究,结果表明:PUA复合乳液在高速率剪切条件下呈现牛顿流体的特性,粘性在乳液体系中占主导地位;乳液墨水也表现出相似的流变学性能,乳液粒子与颜料粒子之间存在一定的相互作用.

Core-shell waterborne polyurethane-polyacrylate complex emulsion was prepared by semi-continuous seed emulsion polymerization using waterborne polyurethane （PU） emulsion as seed, methyl methacrylate （MMA）, styrene （St）, butyl acrylate （BA）, and acrylic acid （AA） as core layer monomers. The structure and properties of emulsion and its latex film were characterized by transmission electron microscopy （TEM）, differential scanning calorimetry （DSC）, Fourier transmission infrared （FTIR）. The rheological properties of PUA complex emulsion and its utilization as the binder for pigment inks of digital inkjet printing were thoroughly in- vestigated. The results showed that PUA complex emulsion exhibited Newtonian fluid behaviors under high viscosity shearing condition and viscous behaviors dominated in the emulsion system. The emulsion ink occurred similar rheological properties, and there was some interaction between the emulsion and Diament particles.