The invention discloses an early strength type polycarboxylate
water reducer and a preparation method thereof. The early strength type polycarboxylate
water reducer is prepared by performing free
radical polymerization on unsaturated polyether, unsaturated
carboxylic acid, hydramine-containing unsaturated ester and
amide-containing unsaturated compounds in a
redox system under the action of chaintransfer agent; the preparation process saves heat sources and accordingly is green and
environmentally friendly. According to the prepared early strength type polycarboxylate
water reducer, the long-chain unsaturated polyether can achieve certain enhancing effects on the early strength of
cement and concrete components; the hydramine-containing unsaturated ester and the
amide-containing unsaturated compounds serve as unsaturated early strength monomers, contained hydramine groups and
amide groups can promote hydration of C3A (3CaO*Al2O3) to produce
ettringite, thereby accelerating
cement hydration, shortening the time of
cement setting, improving the early strength and increasing the production efficiency of the cement and concrete components. Meanwhile, the
carboxylic acid groups and theester groups inside the molecules of the early strength type polycarboxylate water
reducer endow the early strength type polycarboxylate water
reducer with good dispersibility and dispersion retentivity.