Effect on the Electrical Heating of Textiles-Coated Graphene/Waterborne Polyurethane Composites with Different Coating Areas

그래핀/WPU 복합체 코팅 면적에 따른 전기 발열 텍스타일의 특성에 관한 연구

In this study, a graphene/waterborne polyurethane (WPU) composite solution was coated on cotton and polyester fabrics with various coating areas to examine their applications in electrical heating fabrics for use in various areas. The graphene/WPU composites were prepared with 25 wt% WPU, and 0, 4, 8, and 16 wt% graphene. The graphene/WPU composite was coated on cotton and polyethylene terephthalate (PET) fabrics with a double plane using the knife-edge method. Fabric heating elements were fabricated with dimensions of $10.0cm{\times}10.0cm$, $7.5cm{\times}7.5cm$, $5.0cm{\times}5.0cm$, and $2.5cm{\times}2.5cm$, respectively, so that they could be applied in a variety of applications after coating. On examining the morphology, it was found that, as the content of the graphene increased, the surface of the coated fabric became smooth and uniform. The surface resistivity increased as the graphene contents increased and slightly increased with decreasing coating area. The surface temperature of the 16 wt% graphene/WPU composite coated on the fabric heating elements of $10.0cm{\times}10.0cm$ and $2.5cm{\times}2.5cm$ area on cotton were 24.5 and $52.3^{\circ}C$, respectively, and on PET fabrics 33.2 and $78.3^{\circ}C$, respectively. It was confirmed that the electrical heating properties were improved because the friction of the moving charge increased as the area of the samples decreased.