Clay-resistant polycarboxylate water reducer and preparation method thereof

Abstract

The invention discloses a clay-resistant polycarboxylate water reducer and a preparation method of the clay-resistant polycarboxylate water reducer. The water reducer comprises the following components by weight: 35-45% of unsaturated polyoxyethylene ether monomer I, 40-50% of unsaturated polyoxyethylene ether monomers II, 10-20% of unsaturated monocarboxylic acid and derivative monomer of unsaturated monocarboxylic acid, 5-15% of unsaturated alkenyl sulphonate, and the like, wherein the unsaturated polyoxyethylene ether monomers I, the unsaturated polyoxyethylene ether monomers II, the unsaturated monocarboxylic acid and the derivative monomers of the unsaturated monocarboxylic acid, the unsaturated alkenyl sulphonate and the like are mixed and copolymerized, and then neutralized by polyethylene polyamine which is 0.5-2.0% of total monomer weight. The polyethylene oxide alkenyl short side chain of the water reducer can enhance the stability of the solvation water membrane layer on the surface of mineral fine powder particles in concrete; carboxyl groups and sulfonic groups generate electrostatic adsorption to prevent the adsorption and water absorption expansion rate of internal structures between clay layers; and polyethylene polyamine chains are adsorbed on the surfaces of clay particles to have shielding and scattering functions, therefore, the problem that the polycarboxylate water reducer and overlarge mud content in a concrete material are incompatible can be solved effectively.

Description

technical field [0001] The invention relates to the field of preparation of concrete water reducers, in particular to a clay-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, my country's modern high-performance concrete has been widely used in construction projects. The rapid development has led to a shortage of sand and gravel raw material resources. In actual projects, a large number of machine-made sand or mixed natural fine sand is used, and its mud content or clayey stone powder content is relatively high. High; in addition, green high-performance concrete must be mixed with a large amount of aluminosilicate clay mineral fine powder, such as fly ash, coal gangue powder, zeolite powder, metakaolin powder, etc. For the green high-performance concrete of water reducing agent, the clay fine powder material in concrete leads to the problem of excessive slump loss and segregation and bleeding, which is extr...

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Problems solved by technology

At present, admixtures (patents CN 1140743A, CN1034218A) and clay stabilizer 1432621A are commonly used in oil drilling engineering to inhibit clay expansion. The adaptability of acid-based water reducer and clay fine powder, but because it is not targeted, it will inevitably affect the normal hydration of aluminosilicate in cement, thus greatly affecting the strength of concrete

[0004] For concrete materials with high clay component content, Chinese patent application CN101798197A discloses a controlled-release polycarboxylate water reducer and its preparation method that suppresses the influence of aggregate mud content, which is a water reducer plus a retarder , and then use the porous structure physical adsorption method of natural zeolite powder, which has limited influence on the slump retention when the mud content in the aggregate is high; Water agent, Chinese patent application CN101708973A discloses a water-retaining and plastic-retaining polycarboxylate-based water reducer and its preparation method, but most of the plastic-retaining polycarboxylate-based water-reducers are used in concrete with high clay mineral fine powder content. The effect of using it in clay is not ideal, and it cannot meet the high fluidity requirement of concrete; Chinese patent application CN102358763A proposes a method for preparing an admixture for suppressing side effects of clay, using some esters, sulfonates and amide monomers Synthetic additives for polycarboxylate superplasticizers have certain effects, but polycarboxylate superplasticizers themselves cannot resist clay adsorption, and it is difficult to adapt to the requirements of concrete pumping construction with high clay content.

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