Novel concrete defoaming agent, and preparation method and application thereof

Abstract

The invention discloses a novel concrete defoaming agent, and a preparation method and application thereof. According to the novel concrete defoaming agent provided by the invention, a plurality of hydrophilic chain segments and hydrophobic chain segments are grafted on carboxyl groups of polyamino acid, wherein the hydrophilic chain segments are polyethylene glycol or polyethyleneimine containing4-10 repeat units, the hydrophobic chain segments are straight-chain alkyl groups containing 11-17 carbon atoms, and the polyamino acid is selected from polyaspartic acid or polyglutamic acid. The novel concrete defoaming agent disclosed by the invention has higher surface activity and better defoaming efficiency than a conventional single-chain type defoaming agent, and has good compatibility with additives. Generation of large bubbles in newly-mixed concrete can be inhibited in a short time, the gas content of the concrete is reduced, and therefore, hardening strength and durability of theconcrete are improved.

Description

technical field [0001] The invention relates to a novel concrete defoamer, its preparation method and application, and belongs to the field of concrete admixtures. Background technique [0002] In recent years, with the development of high-performance concrete, people pay more and more attention to the strength and durability of concrete. Due to the addition of concrete admixtures (especially polycarboxylate superplasticizers), too many large air bubbles are introduced into the fresh concrete, and the air content is high, which greatly affects the strength and durability of the concrete after hardening. At this time, it is necessary to add defoamers to eliminate air bubbles and reduce the air content of concrete. Defoamer is a general term for substances that can control foam by adding it to the foaming liquid at a low concentration. From the perspective of the mechanism of action, it can be divided into two types: foam suppression and foam breaking. From a structural poin...

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Problems solved by technology

[0004] Aiming at the problem that traditional concrete defoamers can

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