二氧化碳响应型高效乳化/去乳化水性聚氨酯的制备及性能

Preparation and Properties of Efficient Emulsification/Demulsification CO_(2)-Triggered Waterborne Polyurethane

以异佛尔酮二异氰酸酯、聚醚二元醇、二甲胺基丙胺二异丙醇、丙烯酸羟乙酯等为原料合成了含有碳碳双键的聚氨酯预聚体,将其与温敏性单体甲基丙烯酸二甲氨基乙酯混合,通过自由基共聚制备了一系列二氧化碳响应型水性聚氨酯-聚甲基丙烯酸二甲氨基乙酯(WPU-co-PDM)乳液,并对乳液和涂层进行了测试与表征。结果表明,聚甲基丙烯酸二甲氨基乙酯(PDMAEMA)对热和pH双重响应促进了乳液在常温下的乳化/去乳化过程,含有温敏结构单元的聚氨酯乳化和去乳化过程更加高效,其膜的耐水性和耐热性能较好。

A series of polyurethane prepolymers containing carbon-carbon double bonds were synthesized by using isophorone diisocyanate,polyether glycol,N-(3-dimethylaminopropyl)-N,N-diisopropanolamine,and hydroxyethyl acrylate,etc.,and then they were mixed with the thermosensitive monomer 2-(N,N-dimethyl amino)ethyl methacrylate to prepare a series of CO_(2)-triggered waterborne polyurethane-co-poly[2-(N,N-dimethyl amino)ethyl methacrylate](WPU-co-PDM)via free radical copolymerization.In further,the structure and properties of the WPU-co-PDM emulsions and their films were investigated.The results show that the emulsification and demulsification process of the WPU-co-PDM at room temperature are promoted due to the dual response of poly[2-(N,N-dimethyl amino)ethyl methacrylate]to thermal temperature and pH values.The emulsification and demulsification process of waterborne polyurethane containing thermosensitive units are more efficient under the stimulating of CO_(2),and their films have the better water and heat resistance.