Preparation method of concrete water evaporation inhibitor

Abstract

The invention provides a preparation method of a concrete water evaporation inhibitor. The obtained concrete water evaporation inhibitor is uniform in particle size and difficult in layering, and a use quantity of an emulsifier can be reduced. The preparation method comprises the following steps of preparing components of the concrete water evaporation inhibitor, wherein the components include C15 to C20 long chain alcohol, the emulsifier, water and selectable thickener and antifoaming agent; mixing the long chain alcohol, the emulsifier and water for pre-emulsification; in a state that the long chain alcohol is completely molten, carrying out high-speed shearing emulsification at a temperature above 40 DEG C, wherein mass of the water for pre-emulsification is 15 percent to 50 percent of all water consumption in the components; then rapidly adding the rest of water with a temperature of 5 to 30 DEG C in 1min, and carrying out high-speed shearing stirring to uniformly mix the components; selectably continuing to add the thickener and the antifoaming agent, and uniformly mixing to obtain the concrete water evaporation inhibitor.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a preparation method of a concrete moisture evaporation inhibitor. Background technique [0002] After the concrete is poured, due to a certain humidity difference with the air, the moisture in the concrete will migrate outward, which reduces the moisture required for the normal hydration of the concrete on the one hand; on the other hand, the humidity gradient and stress concentration caused by dehydration will increase It will cause plastic cracking and dry cracking, and at the same time, rapid dehydration will easily cause crusting on the concrete surface, which will make it difficult to plaster the surface and increase the difficulty of construction. This phenomenon is particularly prominent in modern concrete. The reason is that the water-binder ratio of modern concrete continues to decrease due to the wide application of high-efficiency water reducing agents and large-volume mineral...

AI Technical Summary

Problems solved by technology

[0004] Patent document CN101805145A discloses an externally coated plastic concrete moisture evaporation inhibitor. Although this material has excellent performance, its solid content is relatively low, ranging from 1% to 10%, resulting in a waste of transportation resources.

[0005] Known concrete moisture evaporation inhibitors are difficult to increase its solid content because of the following problems: (1) the amount of emulsifier used is large, and it is easy to foam; (2) the long-chain alcohol as the main component is easy to agglomerate, causing the emulsion particle size Large and uneven, resulting in easy delamination and instability of concrete moisture evaporation inhibitors

If the solid content is further increased, the concentration of emulsifiers and long-chain alcohols will increase accordingly, and the phenomenon of foaming and instability will become more serious, and the resulting product will not be usable at all

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