Phosphonic acid-based block polymer, and preparation method and application thereof

Abstract

The invention provides a phosphonic acid-based block polymer, and a preparation method and application thereof. The phosphonic acid-based block polymer is high in adsorption capacity and saturation adsorption capacity, the initial high dispersion of low-water-glue-ratio concrete can be achieved, the viscosity of a system is reduced, and the sulfate and clay interference resistance is high. The preparation method of the phosphonic acid-based block polymer comprises the step that the phosphonic acid-based block polymer is prepared from an ether-type fragment A, a phosphonic acid-based section Band a third part aldehyde C through a copolycondensation reaction, wherein the molar ratio of the ether-type fragment A to the phosphonic acid-based section B is 1:(0.8-5.0), the ether-type fragment Ais obtained from polyether monomer a of a special structure and first part aldehyde C through polycondensation, and the molecular weight of the polyether monomer a is 1200-4800 and is preferably 1500-2500; the phosphonic acid-based section B is obtained from phosphonic acid group containing monomer b and monomer c of a special structure and second part aldehyde C in an aprotic weak-polar solventE through polycondensation.

Description

technical field [0001] The invention relates to a phosphonic acid-based block polymer, its preparation method and application, and belongs to the technical field of concrete admixtures. Background technique [0002] As a new building material, high-strength concrete has been widely used in high-rise building structures, long-span bridge structures and some special structures due to its advantages of high compressive strength, strong deformation resistance, high density and low porosity. application. The biggest feature of high-strength concrete is its high compressive strength, which is generally 4 to 6 times that of ordinary strength concrete, so it can reduce the cross-section of components, so it is most suitable for high-rise buildings. Therefore, more and more prestressed high-strength concrete structures are used in large-span buildings and bridges around the world. In addition, taking advantage of the high density of high-strength concrete, it can be used to constru...

AI Technical Summary

Problems solved by technology

[0010] With the country's large-scale infrastructure construction, resources such as natural river sand and high-quality fly ash are increasingly depleted, artificial aggregates, coal gangue, desulfurization ash and other low-activity industrial wastes are also gradually used in modern concrete. In traditional polycarboxylic acid The structural design and optimization within the molecular framework cannot fundamentally solve a series of application problems such as low initial dispersion efficiency, large slump loss, and high system viscosity of low-water-binder ratio concrete. technological development

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