| abstract |
A phosphate type polycarboxylate water reducer and a preparation method. A first polymer of which the molecular weight of an effective component is 5,000-20,000 is obtained by means of esterification between polyacrylic acid and polyethylene glycol phosphate; a second polymer of which the molecular weight of an effective component is 30,000-80,000 is obtained by means of copolymerization of an unsaturated polyether, an unsaturated phosphate, and compound A; the phosphate type polycarboxylate water reducer is obtained by mixing the first and second polymers in proportion. The first polymer has the smaller molecular weight, and thus is preferentially adsorbed and intercalated in a layered structure of clay, thereby reducing adsorption of the clay on the second polymer and thus enhancing adaptability of the water reducer on various gravel aggregates. |