石墨烯/水性聚氨酯湿法凝固涂层的制备与性能

Preparation and properties of graphene/waterborne polyurethane wet solidification film

以石墨烯为导电填料，通过物理共混的方法将石墨烯分散到水性聚氨酯中，以酸性盐溶液为凝固剂，通过湿法凝固制备石墨烯／水性聚氨酯涂层。研究了石墨烯的分散条件、分散剂用量、石墨烯添加量等因素对成膜的影响；并对复合膜的微观结构和电性能进行分析。试验结果表明：以聚乙烯吡咯烷酮分散剂，用量为3mg／mL，超声分散30min，可以制得稳定的石墨烯水分散液；石墨烯用量为水性聚氨酯质量的0．6％，碳酸钙用量为6％时，成膜表面电阻率降低到0．91×10^7Ω，与纯WPU材料相比导电性提高了5个数量级。

Graphene was used as conductive filler dispersed into the waterborne polyurethane （WPU） through physical blending. Acid salt solution was applied as the solidification agent. Graphene/waterborne polyurethane film was prepared by wet solidification. The influences of graphene dispersion conditions, dispersant amount and graphene adding amount on the films were studied. And microstructure and electrical properties of the complex films were ana- lyzed. The results show that when polyvinylpyrrolidone （PVP） is used as the dispersant with the dosage of 3mg/mL and ultrasonic dispersing for 30min, the stable grapheme dispersion liquid can obtained. When the graphene addition amount is 0.6% and calcium carbonate content is 6%, the composite membrane surface resistivity decreases to 0.91 × 10^7Ω. The electrical conductivity of the complex films increases by five orders of magnitude compared with that of the pure WPU material.