Preparation method of clay anti-sensitivity solid polycarboxylate superplasticizer

Abstract

The invention discloses a preparation method of a clay anti-sensitivity solid polycarboxylate superplasticizer. The solid polycarboxylate superplasticizer is prepared by subjecting an unsaturated polyoxyethylene ether macromonomer a, an unsaturated carboxylic acid monomer b, an unsaturated alkyl ester monomer c and an unsaturated cationic monomer d according to a molar ratio of 1:(3.5-6.0):(0.5-1.0):(0.1-0.5) to solvent-free bulk polymerization under the action of an organic initiator and a chain transfer agent, and slicing by a condensation slicer. No volatile solvent is used in the production process; the process is simple, the prepared clay anti-sensitivity solid polycarboxylate superplasticizer has the advantages of being high in purity, good in solubility, low in clay sensitivity andthe like, the adverse effect of clay components in high-mud-content sandstone aggregate on the performance of the polycarboxylate superplasticizer is effectively reduced, meanwhile, due to the solid characteristic of the polycarboxylate superplasticizer, the packaging and transportation cost is greatly reduced, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a clay antisensitivity solid polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a new generation of high-performance superplasticizer after lignosulfonate superplasticizer and naphthalene-based high-efficiency superplasticizer. It has the advantages of adjustable structure, green and environmental protection, and has been widely used in concrete. However, in recent years, the shortage of sand and gravel resources, the quality deterioration, the high mud content of natural sand and the silt content of machine-made sand have seriously affected the quality of concrete, especially the dispersibility and slump retention of traditional polycarboxylate water reducers due to the content of montmorillonite It has a great impact. The workability of freshly mixed concrete is greatly reduced, the l...

AI Technical Summary

Problems solved by technology

[0007] At present, polycarboxylate superplasticizers with clay antisensitivity are mostly made by aqueous solution free radical polymerization, and most of them are solution products with a concentration of 10-50%, which is inconvenient for storage and transportation, especially in long-distance transportation, which will lead to significant transportation costs. Increase

However, traditional powder products made by spray drying consume a lot of energy in production, and are prone to partial crosslinking under high temperature conditions, destroying the original molecular structure of polycarboxylate superplasticizers, resulting in a decline in performance

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