EXPANSIVE POLYMER GROUTING MATERIAL USED FOR HIGH-PRESSURE LARGE-FLOW KARST GUSHING WATER TREATMENT AND PREPARATION METHOD

摘要

A method for preparing an expansive polymer grouting material used for high-pressure large-flow karst gushing water treatment, which relates to the technical field of underground engineering plugging materials. The method comprises: 1) adding a cross-linking agent to acrylic acid; then adding a polymer water absorbing resin comonomer to perform a polymerization reaction so as to obtain a precursor; 2) adding an initiator to the precursor obtained in step 1), increasing the temperature, obtaining a hydrogel after reaction, and then crushing the hydrogel to obtain a primary polymer water absorbing resin; 3) spraying a surface cross-linking agent on a surface of the primary polymer water absorbing resin obtained in step 2), and then drying the product; 4) preparing an inorganic water conducting agent into a suspension, then spraying the suspension on the product obtained in step 3) and drying to obtain an expansive polymer grouting material.