氨基硅油接枝聚碳酸亚丙酯水性聚氨酯的合成与性能

Synthesis and Characterizations of Polypropylene Carbonate Polyol Waterborne Polyurethane Grafted with Amino Silicone Oil

以聚碳酸亚丙酯多元醇(PPC)为软段,以二羟基丙酸(DMPA)为亲水扩链剂,合成水性聚氨酯(WPU)预聚体,通过氨基硅油(AEAPS)接枝改性制备了系列WPU乳液。采用红外光谱(FT-IR)、原子力显微镜(AFM)、X射线衍射(XRD)、热重分析(TGA)、接触角和耐水试验对WPU结构和性能进行表征。结果表明,纯PPC型WPU胶膜软硬段微相分离不明显,AEAPS改性胶膜软硬段微相分离明显,胶膜的结晶性随着AEAPS含量的增大而降低,胶膜耐热稳定性、耐水性和水接触角随着AEAPS含量的增大而提高。

The prepolymer waterborne polyurethane （WPU） was synthesized by the reaction of polypropylene carbonate polyol （PPC） as soft segment and dimethylolpropionic acid （DMPA） as hydrophilic chain extender, then grafted with amino silicone oil AEAPS to prepare the WPU emulsion. The structure and properties of the polyurethane were characterized by Fourier transform infrared spectrometer （FT-IR）, atomic force microscope （AFM）, X-ray diffraction（XRD）, thermogravimetric analysis （TGA）, and its contact angle and water resistance were tested. It is found that, for pure WPU film, the microphase separation is unapparent between its hard segments and soft segments, while it is obvious for the WPU film modified by grafting with AEAPS. With increase of the AEAPS amount, the crystallinity of the WPU film decreases. Meanwhile, the thermal property, the water resistance property and the water repellency of the film are also improved.