The invention discloses a preparation method of a novel polyether-synthesis slow-release-type polycarboxylic
acid water reducer. The method comprises the following steps that S1, a polyether
macromonomer and deionized water are added into a reaction kettle, stirred at the normal temperature and dissolved, and a small unsaturated acid or anhydride
monomer and a small unsaturation esters
monomer aremixed in water to obtain an A solution; a reduction agent, a
chain transfer agent and water are sufficiently mixed to obtain a B solution for use; S2, a certain amount of A solution is added to a
macromonomer aqueous solution obtained in the step S1, and even stirring is conducted; S3, an
oxidizing agent is added to the mixture obtained in the step S2 in advance, then the B solution is dropwise added, the A solution is dropwise added after the B solution is dropwise added for 2-10 min, and after drip addition is completed, heat preservation is conducted for 0.5 h; S4, after a reaction is completed, an alkaline solution is added for
neutralization, the product is poured out, and the slow-release-type polycarboxylic
acid water reducer is obtained. The obtained slow-release-type polycarboxylic
acid water reducer has the advantages that the slow
release time is long, the
slump degree can be maintained for a long time, and the
slump result is excellent.