Solid polycarboxylic acid water reducing agent

Abstract

The invention relates to a solid polycarboxylic acid water reducing agent which is prepared by copolymerizing unsaturated acid and an unsaturated monomer in an organic solvent, separating, precipitating and drying at low temperature. The solid water reducing agent is dissolved in a water solvent and has no difference in combination property compared with the commercial liquid polycarboxylic acid water reducing agent with the same concentration. On the premise of no great amount of liquid water reducing agent, the solid polycarboxylic acid water reducing agent is more convenient to transport; and in addition, the transportation cost is greatly reduced.

Description

technical field [0001] The invention relates to a concrete additive, in particular to a solid polycarboxylate water reducer. Background technique [0002] Concrete water reducer refers to 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; through surface activity, complexation, electrostatic repulsion or three-dimensional repulsion, etc. To hinder or destroy the flocculation structure of cement particles, so as to save the amount of cement while ensuring the workability and strength of concrete. At present, water reducing agent has become an indispensable fifth component in the current concrete, and more and more attention has been paid to it. [0003] Traditional water reducing agents can be divided into lignosulfonic acids, polycyclic aromatic salts and water-soluble resin sulfonic acids according to the composition materials. Water re...

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Problems solved by technology

[0005] But now polycarboxylate superplasticizers are mostly liquid products with a concentration of 10-50%. Due to the remote construction site and the existence of a large amount of liquid water solvent in polycarboxylate superplasticizers, the transportation cost continues to increase, so the development High concentration, especially solid polycarboxylate products, is the primary condition for reducing transportation costs and promoting the widespread use of polycarboxylate superplasticizers in various places

[0006] Although there are some solid polycarboxylate superplasticizers on the market at present, after dissolving them, compared with liquid polycarboxylate superplasticizers of the same concentration, the performance is quite different.