A kind of preparation method of polycarboxylate water reducer

Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer. The preparation method comprises the following steps: (1) weighing components; (2) uniformly mixing water and an emulsifying agent for full dissolution, and then adding unsaturated ester and unsaturated acid while stirring under the protection of nitrogen to prepare stable and uniform monomer emulsion; (3) adding 30-35% of an oxidant, 30-35% of the monomer emulsion and a buffering agent into an unsaturated polyethenoxy ether solution once at normal temperature, maintaining the pH value of the solution to be 3.8-5.5, and stirring uniformly; (4) dropwise adding the remaining oxidant, the remaining monomer emulsion, a first solution and a second solution into the materials of the step (3), and performing curing; (5) adding an alkaline regulator into the materials of the step (4) to perform neutralization so as to obtain the polycarboxylate superplasticizer. The preparation method disclosed by the invention is easy in condition control, does not need heating during production, and is less in energy consumption, short in synthesis time, simple and convenient in production, low in cost and friendly to environment.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a 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 and 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 consumptio...

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.