Novel anti-mud slump-retaining nano polycarboxylic acid water reducer and preparation method thereof

Abstract

The invention discloses a preparation method of a novel anti-mud slump-retaining nano polycarboxylic acid water reducer. The novel anti-mud slump-retaining nano polycarboxylic acid water reducer is prepared by the following steps: (1) preparing an anti-mud cross-linking agent; and (2) performing polymerization reaction. The novel anti-mud slump-retaining nano polycarboxylic acid water reducer with a cross-linked structure is obtained by carrying out emulsion polymerization on a sulfonate polymerizable emulsifier, a polyether polyol anti-mud cross-linking agent and a monomer. Through cross-linking hardening of the nano-micelle structure, the dispersity of the water reducer can be improved, and the effects of thickening, viscosity reduction, effective mud resistance and concrete workability improvement are achieved. As the nano polycarboxylate superplasticizer is gradually hydrolyzed in cement paste, micelles are cracked through fracture of a cross-linked structure and change of hydrophilicity and hydrophobicity, and various anti-mud small molecules and linear polycarboxylic acid molecules can be released, so that the nano polycarboxylate superplasticizer has long-term anti-mud slump retaining effects. The water reducer can also be used as a regulator in machine-made sand concrete.

Description

technical field [0001] The invention belongs to the field of macromolecule materials, and in particular relates to a novel mud-resistance and slump-preserving nanometer polycarboxylate water reducer and a preparation method thereof. The product can be used in the construction of high-mud or inferior machine-made sand aggregate concrete. Background technique [0002] With the development of today's society and the rapid increase in the demand for engineering construction in all aspects, concrete, as one of the most important construction engineering materials, its preparation technology and performance are also constantly developing. The current construction requirements have high requirements on the fluidity and retention capacity of concrete. The mineral admixtures and functional admixtures used in large quantities in high-performance concrete also make fluidity and long-term maintenance more difficult. In addition, due to my country's vast territory, obvious changes in tem...

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Problems solved by technology

[0005] The anti-mud admixture prepared by the prior art is not satisfactory in terms of effect and mechanism for solving the problem of high mud content, and is often accompanied by problems of increased cost, difficulty in use, and unstable effect, making it difficult to produce on a large scale application

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