A preparing method of a ternary copolymerized water reducer

Abstract

A preparing method of a ternary copolymerized water reducer is disclosed. The method includes adding a proper amount of water, modified polyether and a molecular weight regulator into a reactor, stirring, dissolving to obtain a modified polyether solution, heating to 70-85 DEG C, adding dropwise a monomer mixture of acrylic acid and acrylamide and an aqueous initiator solution at the same time, after addition of the monomer mixture and the aqueous initiator solution is finished, continuously reacting at maintained temperature for 2-4 h, cooling after the reaction is finished, adding an alkali for neutralizing, and adjusting pH of the solution to 7-8 to obtain the modified polyether-polyacrylic acid-polyacrylamide ternary copolymerized water reducer. The method reduces raw material costs, is mild in preparation process conditions, low in cost and capable of meeting environment protection requirements. The water reducer can improve early-stage strength and final-strength of concrete perforated brick setting structures. Properties of the water reducer are superior to those of polycarboxylate water reducers of the same series in the market. The water reducer has a high cost performance ratio and high market competiveness.

Description

technical field [0001] The invention belongs to the technical field of water reducers, and in particular relates to a preparation method of a ternary copolymerization water reducer. Background technique [0002] With the rapid development of concrete technology, various indicators of concrete have also been continuously improved. Studies have shown that although there are many reasons for the cracking of concrete porous brick walls, there are cracks caused by temperature changes, cracks caused by masonry settlement deformation, and poor structure. Reasonable cracks, holes in the wall, cracks caused by grooves, etc., but the drying shrinkage of concrete porous brick masonry is often considered to be an important cause of wall cracking, so the demand and performance requirements for concrete admixtures are also important. Higher and higher. Water reducer is the most commonly used and most important concrete admixture. Adding an appropriate amount of water reducer can effectiv...

AI Technical Summary

Problems solved by technology

Naphthalene-based water-reducers have a long production cycle and serious environmental pollution. Melamines also have environmental pollution problems, which limit their further application. Polycarboxylate-based water-reducers have become a research hotspot due to their series of advantages.

The polycarboxylate water reducer MPEGMAA widely used in China is relatively expensive, and the preparation process is complicated

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