Polyphosphate compound as well as preparation method and application thereof

Abstract

The invention discloses a polybasic phosphate compound as well as a preparation method and application thereof. According to the polybasic phosphate compound, phytic acid serves as a core, six phosphate functional groups on the periphery of a six-membered ring are respectively grafted with 1-6 polyether side chains, the polyether side chains are connected with the phytic acid through phosphate ester bonds, the molecular form of the compound is linear or star-shaped, and adsorption groups are exposed phosphate monoester and phosphate diester; the number of functional groups of the phosphomonoester is 1-6, and the number of functional groups of the phosphodiester is 1-6. The polybasic phosphate compound provided by the invention can regulate concrete bubbles and bubble stability, promote initial dispersion, reduce the sensitivity of concrete to cement, gravel aggregate and water consumption, enhance the sulfate and clay interference resistance, and enhance the strength and durability of concrete. The method is simple in preparation process, high in industrial production feasibility and wide in market application space.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polyphosphate-based compound, its preparation method and application. Background technique [0002] Self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. The principle of preparing self-compacting concrete is to reduce the yield stress of concrete enough to be overcome by the shear force generated by its own weight, so that the concrete flows At the same time, it has sufficient plastic viscosity to suspend the aggregate in the cement slurry without segregation and bleeding problems. It can flow freely and fully fill the space in the formwork to form a dense and uniform gelled structure. [0003] With the continuous innovation of architectural design concepts, key pro...

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Problems solved by technology

[0010] The present invention aims at the problem of poor workability of concrete, especially self-compacting concrete, and based on the deficiencies of the prior art, specially designs and develops a polyphosphate-based compound with a novel structure and its preparation method, which can adjust the stability of concrete bubbles and bubbles, and promote Initial dispersion, reduce the sensitivity of concrete to cement, sand and gravel aggregates and water consumption, enhance the ability to resist sulfate and clay interference, and enhance the strength and durability of concrete

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