| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cement dispersant that is excellent in water-reducing property, causes no delay in coagulation, yields fresh concrete that can be easily kneaded and mixed due to low viscosity and is excellent in workability. <P>SOLUTION: An admixture for a hydraulic composition comprises: (A) a copolymer obtained by reacting monomers (a) and (b), or a salt thereof, provided that (a) is an ester compound obtained by adding 0-10 mol 2-4C alkylene oxide to 1 mol at least one compound represented by formula (1): R<SP POS="POST">1</SP>O-(AO)n-H (where in R<SP POS="POST">1</SP>is a 1-12C alkyl group; A is a 2-4C alkylene group; and n represents the number of moles added and is an integer of 0-7) and further reacting the adduct with an α, β-unsaturated carboxylic acid and (b) is an α, β-unsaturated carboxylic acid or a salt thereof; and (B) a copolymer obtained by reacting monomers (d) and (e), or a salt thereof, provided that (d) is a polyalkylene glycol alkenyl ether and (e) is an α,β-unsaturated carboxylic acid or a salt thereof. <P>COPYRIGHT: (C)2013,JPO&INPIT |
