Phosphonic acid-based polymer with strong adaptability and slump retention properties and its preparation method and application

Abstract

The invention discloses a phosphonate-base polymer with high adaptability and slump retaining properties, and a preparation method and application thereof. The phosphonate-base polymer has the following structural characteristics: the side chain is an ether type chain segment; and the polymer has two stages of adsorption groups, the primary adsorption group is a phosphonate or phosphite functional group, the secondary adsorption group is carboxyl, and the two functional groups are connected by an ester bond or amido bond. The weight average molecular weight of the phosphonate-base polymer with high adaptability and slump retaining properties is 10000-50000. The phosphonate-base polymer has a novel molecular structure, and thus, has the advantages of low doping amount, high water reducing rate, excellent slump retaining properties, and high sulfate and clay interference resistance. The preparation technique can implement industrialization, and thus, has broad market application space.

Description

technical field [0001] The invention relates to a phosphonic acid-based polymer with strong adaptability and slump-preserving performance and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] 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 gradually used in modern concrete, and polycondensed with sulfonic acid groups The traditional first and second generation water reducers based on substances and the third generation of high performance admixtures based on carboxyl polymers have increasingly prominent adaptability problems in new complex component systems, such as low initial dispersion efficiency, Due to a series of application problems such as large slump loss and high system viscosity, the control of concr...

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Problems solved by technology

[0012] The present invention aims to overcome the poor adaptability between the existing polycarboxylate water reducer and cement, which is sensitive to sulfate and clay content, resulting in insufficient initial dispersion efficiency of concrete, serious slump damage, etc., and provides a strong adaptability and slump retention performance A phosphonic acid-based polymer and a preparation method thereof, the phosphonic acid-based polymer has a novel molecular structure, so it has the advantages of low dosage, high water reducing rate, excellent slump retention performance, and strong resistance to sulfate and clay interference, And the preparation process can be industrialized, and the market application space is broad

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