A kind of preparation method of comprehensive polycarboxylate water reducer

Abstract

The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a comprehensive polycarboxylate water reducer. Background technique [0002] As the third generation of high-performance concrete water reducer, polycarboxylate admixture has the advantages of low dosage, high water reducing rate, good slump performance, strong molecular structure adjustability, and clean production process. The key to the quality of concrete engineering has become an essential material and core technology for the manufacture of high-performance modern concrete. [0003] However, in the actual engineering application process, the existing polycarboxylate water reducers show some problems. For example, cement, sand, and stone materials currently on the market are becoming more and more complex, with high mud and powder content, and the increase in the adsorption of polycarboxylic acid leads to rapid loss of concrete...

AI Technical Summary

Problems solved by technology

At present, the method to solve this kind of problem is mainly to increase the dosage of polycarboxylate superplasticizer or to achieve mud resistance or early strength effect through compounding additives, but these measures are either very cumbersome in operation, or the cost is increased, or is the general effect

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