Fast-cured super-early strength polycarboxylate water reducer and preparation method thereof

Abstract

The invention discloses a fast-cured super-early strength polycarboxylate water reducer and a preparation method thereof. According to the fast-cured super-early strength polycarboxylate water reducerdisclosed by the invention, by using a molecular cutting technique, molecular structures of main chain groups, side chain groups and the like are designed, 4-hydroxybutyl vinyl polyoxyethylene etherof a super-high molecular weight is adopted as an active large monomer, a small monomer of self-made unsaturated alcohol amino ester and triallylamine are introduced, and solution polymerization is carried out at a low temperature. The polycarboxylate water reducer has an outstanding function of promoting cement hydration reactions, can be applied to steam-curing concrete, low-temperature environment concrete and concrete with a requirement of demolding in advance, is capable of remarkably shortening the plastering and primary curing time of a molded plate, has a remarkable early strength effect, and is capable of accelerating the construction progress of concrete and increasing the transfer rate of mold plates.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a fast-setting super-early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the characteristics of high water reducing rate, high slump retention, low alkali, and environmental protection, and has been widely used in concrete engineering. However, the early strength development of ordinary polycarboxylate superplasticizers is slow, especially under low temperature conditions, which limits the use of ordinary polycarboxylate superplasticizers in winter construction and cold environments, and also restricts their use in prefabricated components. . In order to improve the production efficiency of prefabricated components and speed up the turnover rate of formwork, it is not only required that the polycarboxylate superplasticizer has a good water-reducing and dispersing...

AI Technical Summary

Problems solved by technology

CN101024565A discloses an early-strength composite water reducer obtained by compounding early-strength components such as anhydrous calcium chloride, triethanolamine, and sodium benzoate, which can improve compressive strength to a certain extent, but does not mention whether it has fast Coagulation effect, and contains chlorine salt, which will corrode reinforced concrete;

[0004] CN105199032A discloses a super-early-strength polycarboxylate water-reducer. The technical scheme is synthesized from various active macromonomers, and cations are introduced into the molecules, thereby reducing the adsorption of the soil to the admixture and accelerating the hydration of the cement It has the effect of super early strength, and its polymerization temperature is 85-95°C, which is relatively high and difficult to control, and it does not consider that the 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer is easy to decompose when the temperature is high characteristics

CN101085701A discloses a method for preparing a super-early-strength polycarboxylate water-reducer. Because the esterification of acrylic acid and methoxypolyethylene glycol 4000 is used to obtain a macromonomer with a large molecular weight of esters, the esterification reaction temperature is high (120 °C or higher), the molecular weight is too large to cause many by-products, the esterification rate is low to reduce the active ingredient, the second step synthesis reaction temperature is 60-100 °C, the temperature is too high and it is difficult to control

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