The invention discloses a mining
coal gangue /
polyurethane / water glass composite filling material and a preparation method thereof, and belongs to the technical field of
filling materials, the material is prepared by mixing a component A (water glass, glycerin and a catalyst), a component B (
isophorone diisocyanate,
polypropylene glycol and a
plasticizer),
coal gangue and
fly ash according to a specific ratio, the preparation method comprises the following steps: respectively preparing the component A and the component B, mixing into
slurry, and finally stirring and curing with the
coal gangue and the
fly ash. The
curing time of the material is less than or equal to 124 s, the
compressive strength is higher than 70 MPa, and the material is safe,
environmentally friendly, free of secondary
pollution, outstanding in
flame retardance, capable of meeting the industrial standard and suitable for coal mine top-caving area filling, goaf gas plugging and crack air leakage channel plugging.