以芳香族二胺——二乙基甲苯二胺(DETDA)作为中和前的扩链剂设计合成了水性聚氨酯分散体(WPU),系统研究了DETDA用量对WPU粒径、机械稳定性及成膜后的力学性能、耐水性、透光性等的影响。结果表明:经DETDA改性后的水性聚氨酯分散体具有较小的粒径和较好的分散稳定性。该分散体成膜后表现出优异的拉伸力学强度和韧性、耐水性和透光性。DETDA最优加入量为4%～5%,所制备的WPU膜拉伸强度达到59MPa,相比于未改性样品提高了接近300%,断裂伸长率保持在950%以上,同时薄膜吸水率在5%以下。
Waterborne polyurethane (WPU) dispersion was designed and synthesized with aromatic diamine-diethyltoluenediamine (DETDA) as the chain extender before neutralization.The effects of the dosage of DETDA on the particle size,mechanical stability and mechanical properties,water resistance and light transmission of WPU after film formation were systematically investigated.The results showed that the WPU dispersion modified by DETDA had small particle size and good dispersion stability.The dispersion showed excellent tensile mechanical strength and toughness,water resistance and light transmission after film formation.The tensile strength of the prepared WPU film reached 59MPa at an optimal DETDA addition of 4%～5%,which was 300% increase compared with the unmodified sample.The elongation at break was maintained above 950%,while the water absorption of the film was below 5%.
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