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, and the concrete defoamer comprises a defoaming component and an auxiliary defoaming component with a defoaming function, and a foam inhibition component composed of alkynol polyether and alkynol. According to the efficient concrete defoamer composition provided by the invention, the dispersity in water can be improved through the polyether graft modified polysiloxane and the hydrophilic polyether chain segment, and the water-soluble and hydrophobic polysiloxane chain segment endows the efficient concrete defoamer composition with low surface tension; and meanwhile, different surface activities can be achieved by adjusting the arrangement, quantity and the like of polyoxyethylene chain segments and polyoxypropylene chain segments in the polyether chain segments. Alkynediol and ethoxylate thereof have a synergistic effect, so that the balance and dynamic surface tension can be remarkably reduced, and the effects of defoaming, foam inhibition and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a concrete defoamer and a preparation method thereof. Background technique [0002] Concrete is accompanied by a large number of harmful air bubbles during the mixing and construction process. The generation of harmful air bubbles will not only affect the quality and appearance of the product, but also cause concrete defects, making the appearance of the concrete appear honeycomb pitting, and a large number of pores will be formed inside, reducing the quality of the concrete. The void ratio of the structure causes the decline of the mechanical properties and durability of the concrete, which shortens the service life of the concrete. Modern concrete has high requirements for strength and durability, so it is necessary to control the air content of concrete, the stability and quality of air bubbles, and the control and elimination of harmful foam has great technical an...

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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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