论文部分内容阅读
以多异氰酸酯、丙烯酸羟乙酯(HEA)、多羟基含氟丙烯酸酯树脂、丁二酸酐(SAA)和三乙胺(TEA)等为主要原料,合成了紫外光固化的含氟WPUA(水性聚氨酯丙烯酸酯)乳液。采用红外光谱(FT-IR)法和核磁共振氢谱(1H-NMR)法对该产物结构进行了表征,并采用热重分析(TGA)法对产物热稳定性进行了研究。结果表明:当n(-NCO)∶n(TEA)=2∶0.5、n(-NCO)∶n(HEA)=2∶1.5、固含量为50%、剪切速率为2 000 r/min和剪切时间为25 min时,WPUA乳液具有较高的机械稳定性和冻融稳定性;此时WPUA涂膜的综合性能较好,其铅笔硬度为3H、柔韧性为1 mm、光泽度为125且水接触角为72°。
The UV-curable fluorinated WPUA (water-based polyurethane) was synthesized with polyisocyanate, HEA, polyhydroxy fluorinated acrylate resin, succinic anhydride (SAA) and triethylamine (TEA) as the main raw materials. Acrylate) emulsion. The structure of the product was characterized by FT-IR and 1H-NMR, and the thermal stability of the product was studied by thermogravimetric analysis (TGA). The results showed that when the molar ratio of n (-NCO): 2 (TEA) = 2: 0.5, n (-NCO): n (HEA) = 2:1.5, the solid content 50%, the shear rate 2 000 r / min and WPUA emulsion has high mechanical stability and freeze-thaw stability when the shear time is 25 min. At this time, the WPUA coating has better overall performance with a pencil hardness of 3H, a flexibility of 1 mm and a gloss of 125 And the water contact angle is 72 °.