由异佛尔酮二异氰酸酯(IPDI)、聚醚多元醇(DL-2000D)、聚酯多元醇(CMA-244),二羟甲基丙酸(DM-PA)、1,4-丁二醇、乙二醇合成含异氰酸酯基(—NCO)的聚氨酯预聚体,再令其与整代聚酰胺-胺(PAMAM)接枝,合成不同代数的树枝状水性聚氨酯。用红外光谱(FT-IR)、透射电镜(TEM)、激光粒度分析表征乳液粒径及其分散状态,用原子力显微镜(AFM)、水接触角表征其表观性能,分析胶膜的理化性能。结果表明,由相对分子质量较小的PAMAM(G2)改性所得的水性聚氨酯 WPU-G2的水性聚氨酯耐水、耐热性能有了明显提高。
The polyurethane prepolymer was prepared by the isophorone diisocyanate (IPDI),polyether polyol (DL-2000D),polyester polyol (CMA-244),2,2-Dimethylol propionic acid (DMPA),1,4-Butylene glycol and ethylene glycol.The polyurethane prepolymer was grafted on whole generation of polyamide-amine (PAMAM), and then a new series of dendritic waterborne polyurethane was synthesized.The products were characterized by Fourier transform infrared spectroscopy (FT-IR),transmission electron microscope (TEM),laser particle size analysis.Then the apparent performances were analyzed by using atomic force microscope (AFM)and water contact angle.At last,the physical and chemical properties of the film were studied.The results show that the high elasticity characteristics of PAMAM can effectively improve the physical and chemical performance of waterborne polyurethane.Comprehensive compare different algebraic PAMAM and the physical properties of the modified waterborne polyurethane,the relative molecular mass of smaller PAMAM (G2 )modification of water-based polyurethane WPU-G2 can obviously improve the aqueous polyurethane water resistant and heat re-sistant performance.
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