Polyurethane grouting material is abbreviated as cyanide, which is prepared from isocyanate, polyether and accelerator. With a single liquid infusion, immediately after the water is formed, a water-insoluble gel is formed and a gas is released at the same time, so that the slurry expands and penetrates into the periphery again, that is, the ability to have secondary infiltration. The polymer formed by cyanide condensation has strong impermeability and high stone strength, and is currently used for the leakage treatment of underground engineering.
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