Slow-release high-efficiency polycarboxylate water reducer and preparation method thereof

Abstract

The invention discloses a slow release type efficient polycarboxylic acid water reducer and a preparation method thereof. The slow release type efficient polycarboxylic acid water reducer is composed of the following materials: acrylic acid, maleic anhydride, polyoxyethylene ether macromonomer, a macromolecule template agent, sodium hydroxide, deionized water, a peroxide initiator and a chain transfer agent. The preparation method comprises the following steps: adding sodium hydroxide and deionized water into a stirring kettle to prepare a sodium hydroxide solution; dropping acrylic acid into the sodium hydroxide solution by using a peristaltic pump to obtain a reaction liquid A; adding the peroxide initiator and deionized water into a material barrel to obtain a dissolving solution B; adding the chain transfer agent and deionized water into a material barrel to obtain a dissolving solution C; adding the polyoxyethylene ether macromonomer, maleic anhydride and the macromolecule template agent into a reaction kettle, and sucking out deionized water to obtain a reaction liquid D; adding the reaction liquid A, the dissolving liquid B and the dissolving liquid C into the reaction liquid D by using a peristaltic pump to obtain the slow release type efficient polycarboxylic acid water reducer. The water reducer provided by the invention has slow release property, relatively high water reducing efficiency, and good water reducing performance and slump loss resistant property.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water reducer, belonging to the technical field of building materials, in particular to a slow-release high-efficiency polycarboxylate water reducer. The invention also relates to a preparation method of the polycarboxylate water reducer. Background technique [0002] Concrete water reducer is an admixture that can reduce the amount of mixing water and improve the strength of concrete under the condition that the workability of concrete and the amount of cement remain unchanged. Concrete water reducer hinders or destroys the flocculation structure of cement particles through the action of surfactant, complexation, electrostatic repulsion or three-dimensional repulsion, so as to save the amount of cement while ensuring the workability and strength of concrete. At present, the commonly used water reducing agents on the market include lignosulfonic acids, polycyclic aromati...

AI Technical Summary

Problems solved by technology

The above technologies have not given specific guidance on how to make the polycarboxylate superplasticizer have slow release and higher water reducing efficiency

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