Particle type phosphonic acid-based super plasticizer, and preparation method and application thereof

Abstract

The invention discloses a particle type phosphonic acid-based super plasticizer, and a preparation method and application thereof. The particle type phosphate polymer is composed of polymer particles and water, the polymer particle is a core-shell structure nanoparticle formed by self-assembling polymers rich in phosphonic acid groups, carboxylic acid groups, phenyl groups and ether groups in water, a core layer of the polymer particle is composed of a hydrophobic aromatic polymer rich in phosphonic acid groups, and a shell layer of the polymer particle is a hydrophilic polycarboxylic acid comb-shaped polymer. The superplasticizer is good in water reducing performance, the slump retaining performance of the superplasticizer is far better than that of a common polycarboxylic acid superplasticizer, the mixing amount of the superplasticizer can be effectively reduced when the superplasticizer is applied to actual engineering, and cost is saved; a one-pot method is adopted in the preparation process, efficiency is high, time is short, no organic solvent is used, environment friendliness is achieved, and large-scale production is easy to achieve; compared with the conventional polycarboxylic acid superplasticizer, the superplasticizer disclosed by the invention can keep the initial and later fluidity of concrete at an excellent level under the condition of a relatively low mixing amount.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a particle-type phosphonic acid-based superplasticizer, a preparation method and application thereof. [0002] technical background [0003] Polycarboxylate superplasticizer is one of the most widely studied and used concrete admixtures at present. Under the condition that the workability of concrete remains unchanged, adding polycarboxylate superplasticizer can effectively save the amount of cement and water. , Improve the strength of concrete. In terms of molecular structure, polycarboxylic acid is a comb-shaped polymer, which consists of a main chain rich in carboxylic acid groups and polyether side chains. The surface of the cement or cement hydrate, and the polyether side chain stretches in the solution to form a hydration layer to provide steric repulsion to prevent cement agglomeration, so this structure endows the polycarboxylate with a strong ability to dispe...

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Problems solved by technology

[0008] Aiming at the problem that it is difficult to maintain the fluidity of concrete in the later stage caused by the deterioration of sand and gravel aggregates, the present invention provides a particle-type phosphonic acid-based superplasticizer with excellent water-reducing and slump-preserving properties. It has universal applicability to engineering, and is especially suitable for engineering projects that face problems such as poor sand and gravel aggregates and insufficient retention time of concrete fluidity; compared with conventional polycarboxylic acid superplasticizers, the particle-type phosphonic acid-based Superplasticizer can keep the initial and later fluidity of concrete at an excellent level at a lower dosage

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