A kind of anti-mud type polycarboxylate water reducer and preparation method thereof

Abstract

The invention relates to a mud-resistant polycarboxylate water-reducer and a preparation method thereof, which comprises the following components in weight percent: 10-20% of isomeric alcohol polyoxyethylene ether, 10-20% of acrylic acid ester, bis 5~10% of key organic silicon, 0.5~3% of sodium pyrosulfite anti-mud modifier, 5~10% of charged colloid, 1~5% of active organic acid and the balance are deionized water; the present invention can Preparation of polycarboxylate superplasticizer with excellent stress resistance and slump retention.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is one of the main building materials in the construction industry and the most widely used artificial material in the world. With the large-scale development of national railways, highways, bridges and other infrastructure construction, the demand for concrete continues to rise, and it also promotes the rapid development of admixtures. At present, the most widely used concrete admixture is the water reducer. [0003] Polycarboxylate superplasticizer is a high-performance water reducer, a cement dispersant in cement concrete application, widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects; polycarboxylate water reducer The agent is designed according to the mechanism of dispersing cement. It is super-dispersed and...

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Problems solved by technology

[0004] At present, the application publication number in the existing patent is CN101798197A, which discloses a slow-release polycarboxylate water-reducer for inhibiting aggregate mud content, which is mainly composed of anti-mud type polycarboxylate water-reducer, retarder and natural zeolite Because clay minerals will be preferentially adsorbed on the surface of natural zeolite powder particles, the anti-mud type polycarboxylate superplasticizer molecules are liberated, and it is easier to adsorb on the surface of cement particles, thereby alleviating the effect of clay on the surface of polycarboxylate molecules. The problem of excessive adsorption; however, because the porous structure of zeolite will also absorb too many polycarboxylic acid molecules, so the ready-mixed concrete needs to increase the dosage to achieve the same fluidity

[0005] The application publication number is CN102617811A, which discloses an anti-mud type of amphoteric vinyl polymer. Vinyl cationic monomers are introduced into the molecular structure of traditional polycarboxylic acid. The adsorption effect of the charge shields the adsorption of clay to the superplasticizer. However, as a sacrificial agent, this product not only has high production costs, but also needs to be used in combination with other superplasticizers. Its cost performance is not as good as that of small molecule quaternary ammonium salts.

[0006] The application publication number is CN103897116A, which discloses a mud-resistant polycarboxylate water reducer and its preparation method. Vinyl polyoxyethylene ether, sodium styrene sulfonate, acrylic acid and acrylamide compounds are used as monomers. It is polymerized under the reduction initiation system; this invention uses vinyl polyoxyethylene ether with high activity as the macromonomer, the reaction conversion rate is high, and the water reduction rate of the product is high, but its molecule is in a comb structure, and the side chain is easy to enter the clay Frame structure, resulting in excessive superplasticizer dosage

[0007] To sum up, the polycarboxylate superplasticizer in the prior art needs to increase the dosage while improving the mud resistance, resulting in a large amount of concrete required for compounding with the superplasticizer, resulting in high cost

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