采用不同官能基的偶联剂合成了一系列在硬段中含有硅氧烷链段的水性聚氨酯(WPU)乳液。通过红外光谱、激光粒度仪、耐湿热老化试验、差示扫描量热和热失重等手段详细研究了偶联剂和扩链剂种类及n(扩链剂):n(偶联剂)对WPU乳液性能、粘接性能、耐湿热老化性能和胶膜热稳定性的影响。结果表明:当n(EDA):n(KH550)和n(EDA):n(KH580)为1:1时,WPU的乳液性能、粘接性能和耐湿热老化性能最佳。引入硅氧烷链段对WPU胶膜的微相分离产生影响,微相分离程度较好的WPU-EDA和WPU-550比其他两种热稳定性更好。
A series of waterborne polyurethane(WPU) emulsions containing siloxane groups in hard segment were synthesized by using coupling agents with different functional group instead of part chain extender.The effect of the coupling agent structure and n(ethyl diamine):n(coupling agent) on the emulsion properties,resistance to wet and heat aging properties of WPU,and thermal stability of WPU film were studied by FT-IR,laser particle size analyzer,resistance to wet and heat ageing test,differential scanning calorimeter(DSC) and thermo-gravimetric analysis (TG).The results showed that the emulsion performance,adhesion strength and thermo-moisture resistance of WPU were improved with the introducing coupling agent.The best result was acquired when n(EDA):n(KH550) and n(EDA):n(KH580) was 1:1.The introduction of siloxane chain into the hard segment could affect the microphase separation of WPU film,and WPU-EDA and WPU-550 with higher microphase separation showed better thermal stability than that of others.
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基金资助
山西省科技重大专项(20181101012)
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