A kind of concrete defoamer and preparation method thereof

Abstract

The invention relates to the technical field of building admixtures, in particular to a concrete defoamer and a preparation method thereof, wherein the concrete defoamer includes a defoaming component with a defoaming function and a defoaming aid component, and an alkyne Antifoam component composed of alcohol polyether and acetylenic alcohol. The high-efficiency concrete defoamer composition provided by the present invention is modified polysiloxane by polyether grafting, and the hydrophilic polyether segment can improve the dispersibility in water, giving it water solubility and hydrophobic polysiloxane The chain segment endows it with low surface tension, and at the same time, different surface activities can be achieved by adjusting the arrangement and quantity of the polyoxyethylene chain segment and polyoxypropylene chain segment in the polyether chain segment. And the combined use of acetylenic diol and its ethoxylate has a synergistic effect, which can make the equilibrium and dynamic surface tension significantly lower, and has the effects of defoaming and foam suppression.

Description

Technical field [0001] The present invention relates to the field of building admixture technology, particularly to a concrete defoamer and a method of preparation thereof. Background [0002] Concrete in the mixing and construction process accompanied by a large number of harmful bubbles generated, harmful bubbles will not only affect the quality and appearance of the product, resulting in concrete defects, so that the appearance of concrete honeycomb surface, the interior will form a large number of pores, reduce the void rate of the internal structure of the concrete, resulting in the decline in mechanical properties of concrete, durability, etc., shortening the service life of concrete. Modern concrete has high requirements for strength and durability, so it is necessary to control the gas content, stability and quality of bubbles of concrete, of which the control and elimination of harmful foam has great technical and economic significance. [0003] Defoamer can reduce the ...

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Problems solved by technology

For example, the announcement number is CN106336138B, the publication date is October 19, 2018, and the patent document titled "A Foam Control Agent and Its Air-Entraining Water-reducing Compound and Concrete" discloses a foam control agent, Mainly through the compounding of three acetylenic alcohol wetting agents; and the announcement number is CN107955173A, the publication date is April 24, 2018, and the concrete disclosed in the patent document named "A Novel Concrete Defoamer and Its Synthesis Method" The defoaming agent is polyether, sugar-containing acrylate and low hydrogen-containing siloxane block polymer; the above-mentioned defoaming agent has a certain function of defoaming and foam suppression; the above-mentioned defoaming agent has a certain The bubble function can eliminate harmful large bubbles, but at the same time it will also reduce the stability of excellent bubbles, and eliminate some small bubbles that are beneficial to concrete, resulting in a decline in the mechanical properties and durability of concrete, which needs further improvement

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