Slump retention type solid poly carboxylic acid water reducing agent and preparation method thereof

Abstract

The invention discloses a slump retention type solid poly carboxylic acid water reducing agent and a preparation method thereof and belongs to the technical field of concrete admixtures. The slump retention type solid poly carboxylic acid water reducing agent is prepared from an unsaturated polyoxyethylene ether macromonomer, an organic oxidant, an unsaturated carboxylic acid small monomer, an unsaturated ester small monomer, an organic reducer, a chain transfer agent and a neutralizer. The slump retention type solid poly carboxylic acid water reducing agent has remarkable properties of high water reduction and high slump retention under low doping amount, is good in slump retention stability performance and long in durability and is capable of greatly lowering the packaging cost and the transportation cost when being in a solid form.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a slump-retaining solid polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, polycarboxylate high-performance water reducer has become an indispensable part of modern concrete. It has a large degree of freedom in molecular structure design, green production, and shows high water reduction and low slump loss under low dosage conditions. And other advantages, widely used in various concrete engineering technology fields. And most of the currently commercially available products are solvent-type (concentration is 10%-50%) or powder type (obtained by high-temperature spray drying), wherein, the solvent-type not only increases the packaging cost and transportation cost of the product, but also is unfavorable for long-distance Transportation and export: Although the powder type is better than liquid in terms of packaging...

AI Technical Summary

Problems solved by technology

At present, although the solid polycarboxylate superplasticizers on the market reduce the transportation cost, most of the preparation process is complicated. The reaction system contains organic solvents, which cannot meet the requirements of environmental protection. The removal of organic solvents makes the equipment cost high and the process complicated. , The energy consumption of the reaction is large; the performance decreases after melting again; therefore, the development of a low-cost, simple preparation process, low energy consumption, environmental protection and pollution-free, high-performance solid polycarboxylate water reducer has become the current new situation

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