The polyurethane material used for reinforcing coal and rock masses in coal mines is a two-component grouting reinforcement polymer material, consisting of component A (catalyst) and component B (resin). This product is constructed by mixing and injecting the components at a 1:1 volume ratio into the coal and rock masses using a dedicated pneumatic grouting pump and a mixing injection gun. The low-viscosity mixture can quickly penetrate the fine fractures of the coal and rock masses, and after curing, it forms a high-molecular polymer with excellent mechanical properties, enhancing the overall strength of the coal and rock masses. It is suitable for grouting reinforcement of fragmented coal and rock masses underground. It is mainly used for reinforcing fragmented coal and rock masses at mining and excavation work faces, repairing and reinforcing tunnels and coal pillars, anchoring the full length of anchor rods and cables, and sealing gas drainage holes and water injection holes.