| abstract |
[PROBLEMS] To provide a water stopping agent suitably used for preventing leakage of cement water in civil engineering and construction work. A monomer mixture comprising a monomer represented by the following general formula (1), acrylic acid or a salt thereof, and optionally another vinyl monomer is polymerized in the presence of a crosslinking agent. A water-blocking agent for civil engineering, comprising a water-absorbent resin powder having an average particle diameter of 1 to 50 μm and an elastomer. The content of the repeating unit of the monomer represented by the general formula (1) in the water-absorbent resin is preferably 30 to 80% by mass. Embedded image CH 2 ＣＲCR 1 (CO) —XY—SO 3 R 2 (Wherein, R 1 is a hydrogen atom or a methyl group, R 2 is a hydrogen atom, an alkali metal or ammonium, X is an oxygen atom or a group —NH—, and Y is a straight-chain having 2 to 10 carbon atoms. It is a chain or branched alkylene group.) [Selection diagram] None |