Ether polycarboxylate superplasticizer with rust inhibition function and preparation method thereof

Abstract

The invention relates to the technical field of concrete admixtures, in particular to an ether polycarboxylate superplasticizer with a rust inhibition function and a preparation method thereof. The ether polycarboxylate superplasticizer with a rust inhibition function is prepared from an esterification product, unsaturated polyoxyethylene ether, acrylic acid, an unsaturated polyhydroxy monomer and a rust inhibition functional monomer B with double bonds, amino groups and sulfur bonds through copolymerization. The esterification product is prepared from a rust inhibition functional monomer A with benzene rings and hydroxyl groups and unsaturated acid through esterification reaction. The rust inhibition functional monomer A containing benzene rings and hydroxyl groups and unsaturated acid are esterified to prepare an esterification product which participate in copolymerization, so that molecules of the polycarboxylate superplasticizer contain groups such as benzene rings, amino groups and hydroxyl groups, nitrogen atoms in the amino groups and the hydroxyl groups can improve the adsorption capacity with the surface of a steel bar, the electrochemical reaction process of the surface of the steel bar is inhibited, and meanwhile, the amino groups can be combined with H<+> on the cathode surface, the cathode reaction rate is reduced, and the rust inhibition effect of the steel bar is enhanced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an ether polycarboxylate water reducer with antirust function and a preparation method thereof. Background technique [0002] In recent years, with the continuous and rapid development of my country's economy, the intensity and scale of my country's infrastructure construction have also continued to increase, and the application of concrete components has also increased. Prestressed high-strength concrete pipe piles have the advantages of short construction period, excellent mechanical properties, high cost performance, and less construction conditions, and solve the problem of traditional piles such as driven prefabricated solid piles, bored piles, and vibrating sinking pipe piles. The disadvantages of the foundation are widely used in engineering foundations such as bridges, ports, and docks. [0003] For offshore buildings and buildings in saline-alkali areas, the...

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Problems solved by technology

However, when the rust inhibitor is used in concrete engineering, it needs to be compounded with a water reducing agent, which will inevitably cause the two properties to interact with each other, the superposition effect is not ideal, and the compatibility is not good.

[0006] For example, the announcement number CN109679035A, published on April 26, 2019, the patent document titled "An anti-corrosion and anti-rust polycarboxylate water reducer and its preparation method" discloses the use of unsaturated polyether macromonomer, unsaturated polyether Saturated acid monomer, anti-corrosion functional monomer propylene-benzyldiethylenetriamine, anti-corrosion functional monomer triethanolamine monooleate, initiator, reducing agent and deionized water for copolymerization reaction, introducing Amino groups and hydroxyl groups have a certain improvement in rust resistance, but the water reducing and slump retention effects of water reducing agents are still poor, and the preparation of anti-corrosion functional monomer propylene-benzyldiethylenetriamine monomer is relatively complicated.

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