Anti-mud amphoteric polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses an anti-mud amphoteric polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: reacting 6-dimethylamino-1-hexanol with methacryloyl chloride in an organic solvent to obtain a methacrylic acid-6-dimethylaminohexyl ester intermediate, adding the methacrylic acid-6-dimethylaminohexyl ester intermediate and a polymerization inhibitor into the organic solvent, adding a 1, 3-propane sultone dropwise-adding solution, reacting, and purifying to obtain an amphoteric monomer; mixing an unsaturated polyether macromonomer, an initiator, an unsaturated carboxylic acid monomer and an amphoteric monomer, reacting, and regulating the pH value to 6.5-7.5 to obtain the anti-mud amphoteric polycarboxylate superplasticizer. Compared with a traditional anionic polycarboxylic acid water reducing agent, the mud-resistant functional monomer is introduced into the molecular structure of the prepared anti-mud amphoteric polycarboxylate superplasticizer, the sensitivity of the water reducing agent to mud is reduced, the water reducing agent does not contain chloride ions, potential hazards caused by corrosion of the chloride ions to reinforced concrete can be eliminated, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a mud-resistant amphoteric polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, good slump retention, good dispersion of cement particles, strong molecular structure adjustability and environmental protection, and is more and more widely used in concrete engineering. However, the polycarboxylate superplasticizer has the problem of adaptability to concrete materials in different regions. In recent years, with the extensive use of natural sand and gravel, sand and gravel with a large mud content have been more and more used in concrete. Ordinary polycarboxylate superplasticizers are sensitive to soil, so when the concrete contains mud, the superplasticizer is easily absorbed by the soil, that is, the water reducing agent that really plays a role in red...

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Problems solved by technology

[0003] Chinese patent CN103897116 uses vinyl polyoxyethylene ether, sodium styrene sulfonate, acrylic acid and acrylamide compounds as monomers to synthesize a mud-resistant polycarboxylate water reducer. The water reducer is sensitive to mud content Lower, and better adaptability to cement and various muds, but the production cost is higher

Chinese patent CN103467670 has announced a kind of anti-mud type amphoteric polycarboxylate superplasticizer, and this patent first prepares quaternary ammonium salt oligomer with epibromohydrin and tertiary amine compound, then this quaternary ammonium salt oligomer and Prenyl alcohol polyoxyethylene ether, unsaturated carboxylic acid and its derivatives, and amino trimethylene phosphonic acid are free radically polymerized to obtain a mud-resistant polycarboxylate water reducer. The water reducer can be used without increasing the dosage. Under the premise of solving the problems of insufficient concrete water reduction and large slump loss, but this method has the disadvantages of complicated production process and pollution

Patent CN102617811 Utilize self-made polyethylene glycol monomethyl ether methacrylate, acrylic monomer, vinyl cationic monomer and vinyl sulfonate monomer to prepare amphoteric vinyl polymer concrete anti-mud agent through free radical polymerization , the anti-mud agent can improve the anti-mud performance of concrete, and can inhibit the influence of the mud content in the sand and gravel on the performance of concrete, but the vinyl monomer introduced in the anti-mud agent contains chloride ions, which may cause corrosion of steel bars

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