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以甲苯二异氰酸酯(TDI-80)、聚醚二元醇(N220)、丙烯酸丁酯(BA)和丙烯腈(AN)为主要原料,采用无皂种子乳液聚合法制备了具有核壳结构的水性聚氨酯/聚(丙烯酸丁酯-丙烯腈)乳液互穿聚合物网络(LIPN)。通过红外光谱仪、热重分析仪、透射电镜、粒度仪等分析手段研究了产物的结构与性能。结果表明,与未改性的水性聚氨酯分散液相比,改性后的聚氨酯分散液的粒径均有所增大,乳液的黏度变化不大。胶膜的硬度和耐水性以及热稳定性显著提高,拉伸强度先增大后减小,断裂伸长率下降。HDDA的引入,形成了具有化学交联的核-壳互穿网络结构的聚合物,表现出明显的互穿协同效应,使WPU与乙烯基聚合物分子链具有较高的相容性。
The main raw materials of toluene diisocyanate (TDI-80), polyether diol (N220), butyl acrylate (BA) and acrylonitrile (AN) were prepared by soap-free seed emulsion polymerization Polyurethane / poly (butyl acrylate-acrylonitrile) emulsion interpenetrating polymer network (LIPN). The structure and properties of the product were studied by infrared spectroscopy, thermogravimetry, transmission electron microscopy and particle size analyzer. The results show that compared with the unmodified aqueous polyurethane dispersion, the particle size of the modified polyurethane dispersion increases and the viscosity of the emulsion changes little. Film hardness and water resistance and thermal stability significantly improved, the tensile strength first increased and then decreased, the elongation at break decreased. The introduction of HDDA resulted in the formation of a chemically crosslinked core-shell interpenetrating network structure of the polymer, showing obvious interpenetrating synergistic effect, so that the WPU and vinyl polymer molecular chains have a higher compatibility.