| 摘要 |
PROBLEM TO BE SOLVED: To provide polymers for a cement-dispersing admixture which enable them to perform different functional characteristics in concrete, and are based on a composition comprising such reactants that (a) a poly(acrylic acid), (b) a polyalkylene glycol-monoalkyl ether and optionally (c) an α-amino-polyalkylene glycol-ω-alkyl ether and/or a primary or secondary amine. SOLUTION: The polymers derived from the same reactants composition and having different characteristics are prepared easily under the production conditions of only varying their reacting time, and this brings them to apply suitably to a precast use, a ready-mixed use and a use of requiring progressive workability in proportion to the passage of time, by employing the proper reacting time by the use. The polymers are applicable usefully by a single polymer or a blended polymer. |
