The invention provides a preparation method and use of a micromolecule
water reducer with delayed coagulation and
slump retaining properties. The preparation method has the beneficial effects that a preparation method is strong in adjustability and high in
cost performance, a preparation process is simple, the prepared micromolecule
water reducer has excellent
slump retaining property, delayed coagulation property and clay tolerance. The preparation method comprises the following steps: (1) carrying out
amination reaction: carrying out C=C
double bond Michael
addition reaction by virtue of organic amine with a specific structure and unsaturated
carboxylate with a specific structure, and purifying, so as to obtain an organic amine intermediate with an amino
hydrogen and
carboxylic ester group structure; (2) carrying out
Mannich reaction by virtue of the organic amine intermediate,
formaldehyde and
phosphorous acid, and purifying, so as to obtain phosphorylated organic amine intermediate; and (3) carrying out
condensation reaction by virtue of carboxyl of the phosphorylated organic amine intermediate and polyether with a specific structure and a terminal OH or a terminal NH2 so as toconvert carboxyl into an ester group or acylamino, and alkalizing for
neutralization so as to obtain the micromolecule
water reducer with the delayed coagulation and
slump retaining properties.