Research Status and Development Trends of Sealing Materials for Coal Mine Gas Drainage

Gas drainage is crucial for coal mine safety and clean energy use, with sealing material performance directly affecting drainage efficiency and mine safety. This paper reviews the research and trends of sealing materials for coal mine gas drainage. It categorizes and details traditional (cement-based, polyurethane-based) and new (inorganic expansive, nano-modified, self-healing, composite) sealing materials. The paper also identifies key issues with current materials, such as expansive stability, durability, and environmental adaptability. Considering smart material technology and green mining needs, it proposes four development trends: high performance, functional compositeness, intelligence, and cost-effective environmental friendliness. Research highlights nano-modified inorganic flexible materials and self-healing composites as key solutions for sealing failures in complex geological conditions. Future efforts should focus on improving material-geology adaptability and establishing a full life-cycle quality evaluation system.