辐射法制备内交联聚醚型水性聚氨酯的研究

Study on the Internal Crosslinked Waterborne Polyether-Polyurethane Prepared by γ-Radiation

以异佛尔酮二异氰酸酯、聚氧化丙烯二醇、二羟甲基丙酸、季戊四醇三丙烯酸酯(PETA)和甲基丙烯酸羟乙酯(HEMA)为原料,并以γ射线辐射处理,制备了内交联型水性聚氨酯(WPU)乳液。分析测试了机械稳定性、粘度、粒径及力学性能等,研究了两种封端剂含量、辐照剂量对WPU乳液性能的影响;同时研究了其胶膜的力学性能、吸水率等变化情况。结果表明,所制备的交联型WPU乳液具有较好的稳定性,平均粒径小于0.3μm,WPU经过辐照后,其粒径变化不大。与不含PETA及HEMA的样品比较,引入PETA及HEMA并辐射交联后,WPU胶膜的拉伸强度明显增加,而断裂伸长率和吸水率降低。

Crosslinked waterborne polyurethane（ WPU） dispersions were prepared by isophorone diisocyanate, polypropylene glycol, dimethylolproprionic acid, pentaerythritol triacrylate （ PETA ） , hydroxyethyl methacrylate （ HEMA） and were treated byγray radiation. Stability, viscosity and particle size of the dispersions were studied. The effects of radiation dose and blocking agents contents on the properties of the dispersions, mechanical properties and water absorption of the casting film were also investigated. The results showed that the crosslinked latex had good stability and small particle size with average particle size of 0.3 μm. Compared with the WPU without PETA and HEMA, tensile strength of the internal crosslinked WPU film was increased, the elongation and the water absorption were decreased.