Abstract: In order to address problems of heavy materials and inefficient construction of traditional mine ventilation structures, a new type of graphene polyurethane foam was developed and its performance for various structures was tested. Firstly, new graphene polyurethane foam was prepared using one-step method. Then, its hermeticity was tested through gas permeability experiments of plastic films and sheets. Finally, its structures were analyzed by using a comprehensive thermal analyzer, a Fourier transform infrared spectrometer and a metallographic microscope. The results show that the density of new graphene polyurethane foam is only 40 kg/m³. Infrared spectrum shows that it is rich in organic functional groups such as C=C, C=O, -OH, -CO and -NH, and based on observation of metallurgical microscope, distribution of 160 μm foam is uniform and stable. And the new material remains highly efficient and hermetic within 30 days of simulation test, maintains excellent thermal stability within 400 ℃, and can extinguish within 0.13 s from fire, thus reducing fire risks during its use as a temporary ventilation structure in the mine.

Key words: ventilation structure, temporary sealing, graphene foam, polyurethane, micro structure