US 11,905,352 B2
Expansive polymer grouting material for treating high-pressure large-flow-rate karst water inrush and preparation method thereof
Shucai Li, Jinan (CN); Rentai Liu, Jinan (CN); Chenyang Ma, Jinan (CN); Mengjun Chen, Jinan (CN); Yankai Liu, Jinan (CN); Zhenjun Wang, Jinan (CN); Chunyu Zhang, Jinan (CN); Xiuhao Li, Jinan (CN); and Shaolong Duan, Jinan (CN)
Assigned to SHANDONG UNIVERSITY, Jinan (CN)
Appl. No. 17/275,998
Filed by SHANDONG UNIVERSITY, Shandong (CN)
PCT Filed Oct. 18, 2019, PCT No. PCT/CN2019/112042
§ 371(c)(1), (2) Date Mar. 12, 2021,
PCT Pub. No. WO2020/103621, PCT Pub. Date May 28, 2020.
Claims priority of application No. 201811378133.7 (CN), filed on Nov. 19, 2018.
Prior Publication US 2022/0064347 A1, Mar. 3, 2022
Int. Cl. C08F 220/06 (2006.01); C08K 3/36 (2006.01); E21D 11/38 (2006.01)
CPC C08F 220/06 (2013.01) [C08K 3/36 (2013.01); E21D 11/38 (2013.01)] 21 Claims
 
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.