Preparation method of antibacterial preservative for polycarboxylate-type water reducing agent

Abstract

The invention relates to a preparation method of an antibacterial preservative for a polycarboxylate-type water reducing agent. The preparation method comprises the following specific steps: carrying out a free radical polymerization reaction on isopentenol polyoxyethylene ether, alkyl glycine betaine and dimethyl fumarate under the action of an initiator, a reducing agent and a chain transfer agent; adding fluconazole in a reaction process to prepare the antibacterial preservative. The preservative is formed through carrying out free radical polymerization on an antibacterial preservation monomer and polyoxyethylene ether, has a molecular structure which is similar and compatible with the polycarboxylate-type water reducing agent and belongs to a macromolecular liquid polymer; the antibacterial preservative has remarkable mildew-proof and sterilization effects for long-period storage of the polycarboxylate-type water reducing agent; the antibacterial preservative has no chloride ions and good compatibility, and is green and environmentally friendly; a water reducing performance of the polycarboxylate-type water reducing agent can be free of influences for 15 months.

Description

technical field [0001] The invention relates to a preparation method of an antibacterial preservative, in particular to a preparation method of an antibacterial preservative used in a polycarboxylate water reducer. Background technique [0002] As the third generation of high-performance water reducer, polycarboxylate water reducer has become one of the indispensable components in concrete applications. Polycarboxylate water reducer products are often stored in an aqueous solution with a solid content of 10% to 60%, and its active ingredients are copolymers of polyoxyethylene ether and unsaturated carboxylic acid monomers, some grape powder, and air-entraining agents , white sugar and other small materials, polymer copolymers and sugar small materials provide the nutrients and energy required for the growth and reproduction of organisms. Therefore, there will be a large number of microorganisms and their metabolism after long-term storage The existence of the product will c...

AI Technical Summary

Problems solved by technology

Since the national standard of polycarboxylate superplasticizers strictly controls formaldehyde and chloride ions, the use of such substances should be avoided in preservatives, so as not to affect the durability of concrete after mixing, and such preservatives are compatible with polycarboxylate water reducers. The compatibility of the solvent is poor, and it is easy to precipitate and deteriorate after a long period of storage

[0003] Patent CN103073221A discloses a preservative suitable for low-concentration polycarboxylate superplasticizers, which is compounded with sodium benzoate and quaternary ammonium salts. The invention has a strong bactericidal effect, but the preservative contains quaternary ammonium salts. The cost is too high, the application is limited, and the pH value of the solution is narrow, which affects its anti-corrosion performance. After 120 days, acidification and mold were found.

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