Viscosity reduction type polycarboxylate concrete admixture and preparation method thereof

Abstract

The invention discloses a viscosity reduction type polycarboxylate concrete admixture and a preparation method thereof. The polycarboxylate concrete admixture contains the following synthetic raw materials: low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A, an unsaturated carboxylic acid comonomer B, alkylphenol ethoxylate C, an initiator, a reducing agent, a chain transfer agent, caustic soda liquid and water, wherein the mass ratio of the synthetic raw materials is as follows: a ratio of the low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A to the unsaturated carboxylic acid comonomer B to the alkylphenol ethoxylate C to the initiator to the reducing agent to the chain transfer agent to the caustic soda liquid to the water is (320-420):(24-36):(3-10):(1-5):(0.5-3):(0.5-4):(20-50):(400-500). The viscosity reduction type polycarboxylate concrete admixture disclosed by the invention has the characteristics of excellent dispersion property, obvious viscosity reduction effect, and excellent cement adaptability, and the product is simple in process, safe, reliable and stable in performance, does not contain any chloride ion, does not have any Corrosion damage on reinforcement and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a viscosity-reducing polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's construction industry, high-grade concrete is being more and more used in engineering construction due to its high overall strength and light weight. However, the application environment of high-grade concrete often has complex building structures and dense reinforcement, which puts forward higher requirements for the workability, fluidity, self-compacting and strength growth of high-grade concrete. [0003] At present, the strength of concrete is mainly improved by reducing the water-cement ratio and increasing the amount of cementitious materials, but these methods will increase the viscosity of the concrete and reduce the fluidity, thereby reducing the pumping performance of the concrete and a...

AI Technical Summary

Problems solved by technology

However, the unsaturated modified polyoxyethylene ether macromonomer used in the synthesis process of the water reducer is formed by random copolymerization of ethylene oxide and propylene oxide, and has a relatively large molecular weight, which is very important for adjusting the hydrophilicity and hydrophobicity of the molecular structure and reducing viscosity. It is difficult to make a large contribution to the effect

At the same time, the preparation method of the two-step process and compounding is relatively complicated, and the subsequent industrialization and economics are still problems.

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