A kind of preparation method of high slump polycarboxylate water reducer

Abstract

The invention discloses a preparation method of a high slump retention polycarboxylate water reducer. Compared with the conventional solution polymerization method, the present invention adopts an initiation system combining a photoinitiator and a redox initiation system to increase the reaction rate, and has the advantages of fast reaction speed, high conversion rate, narrow molecular weight distribution, and low cost. It is easy to operate, easy to industrialized production, and has wide application prospects. The performance of the prepared polycarboxylate superplasticizer is stable, the molecular structure is a comb structure, the main chain contains polar groups, and the side chain contains polyoxyethylene-based segments to form a space barrier, which is conducive to improving the dispersion of cement and The ability to maintain dispersion reflects the advantages of high slump retention.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a high-slump polycarboxylate water reducer. Background technique [0002] With the development of concrete in the direction of high performance and multifunctionality, concrete is required to have high workability, high strength, high durability, and can meet the application in many special cases. Superplasticizers with hyperdispersive properties have become one of the indispensable components in high performance concrete. [0003] In recent years, with the country's increasing emphasis on energy saving and emission reduction and the rapid promotion of the concept of low-carbon economy, scientific and technological workers are striving to improve the performance of concrete water reducing agents and also pay attention to how to reduce their energy consumption. In particular, enterprises are trying to find products with low energy c...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the current production process of polycarboxylate superplasticizers mostly adopts heating methods, such as steam heating, heat conduction oil heating, etc., which will cause environmental pollution

[0005] On the other hand, the current production process of polycarboxylate superplasticizers is relatively long, generally takes about 4 to 5 hours, and the production efficiency is slow, so it needs to be stocked in advance, and a certain amount of inventory needs to be occupied, resulting in waste of resources and large investment in fixed assets.