Patent ID: 11905352
Assignee: SHANDONG UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
1. A preparation method of an expansive polymer grouting material for treating high-pressure large-flow-rate karst water inrush, comprising the following steps:
(1) adding a crosslinking agent to acrylic acid; then adding a polymer water-absorbent resin comonomer and performing a polymerization reaction to obtain a precursor;
(2) adding an initiator to the precursor of step (1), heating the mixture, performing a reaction to obtain a hydrogel, and grinding the hydrogel to obtain a primary polymer water-absorbent resin;
(3) spraying a surface crosslinking agent onto a surface of the primary polymer water-absorbent resin of step (2), and drying the obtained product for later use; and
(4) preparing a suspension from an inorganic water conducting agent, spraying the suspension onto the dried product of step (3), and performing drying to obtain the expansive polymer grouting material;
wherein the polymer water-absorbent resin comonomer comprises polyvinyl alcohol, acrylamide, methacrylamide or acrylonitrile;
the crosslinking agent comprises one or a combination of more of N,N-methylenebisacrylamide, dipentaerythritol hexaacrylate, pentaerythritol tetraester, pentaerythritol triallyl ether, pentaerythritol triacrylate, polyethylene glycol diglycidyl ether, ethoxylated glycerol triacrylate and ethylene glycol dimethacrylate;
the surface crosslinking agent comprises one or a combination of more of water, polylol, glycidyl ether, ethylene carbonate, propylene carbonate and a polyvalent metal compound; and
the inorganic water conducting agent comprises fumed silica, nano titania or activated alumina powder.