A kind of polyphosphate-based compound, its preparation method and application

A technology of polybasic phosphoric acid and compounds, which is applied in the field of concrete admixtures, can solve the problems of reducing concrete sensitivity and poor workability, and achieve the effects of improving the performance of hardened concrete, simple and feasible process, and improving workability

Active Publication Date: 2022-04-22
SOUTHEAST UNIV +3
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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  • A kind of polyphosphate-based compound, its preparation method and application
  • A kind of polyphosphate-based compound, its preparation method and application
  • A kind of polyphosphate-based compound, its preparation method and application

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preparation example Construction

[0056] (1) Preparation of polyether

[0057] In a 500mL three-necked flask, add 1.0mol of ethylene glycol and 0.05mol of triethylamine, keep the temperature at 40-60°C, slowly add 1.0mol of benzyl chloride (BnCl) dropwise, and keep it for 1.0h after the addition is complete;

[0058] In a 1000mL autoclave, add 0.1mol of ethylene glycol with one-end hydroxyl protected and 0.006mol of sodium methoxide, slowly heat to 50-60°C, evacuate to -0.08MPa, keep for 30min, slowly add 0.20mol of glycidol, and react After 20 minutes of aging, 0.30 mol of propylene oxide was introduced, and after 20 minutes of aging, ethylene oxide was continuously introduced to keep the reaction pressure at 0.2-0.3 MPa and the reaction temperature at 110-120°C. Add 4.34 mol of ethylene oxide in total. Heat preservation and aging reaction for 30 minutes, degassing, discharge, GPC test: weight average molecular weight Mw = 2200;

[0059] In a 1000mL three-necked bottle, transfer the newly prepared polyether,...

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Abstract

The invention discloses a polyphosphate-based compound, its preparation method and application. The polyphosphate-based compound of the present invention takes phytic acid as the core, and six phosphoric acid functional groups on the periphery of the six-membered ring are respectively grafted with 1-6 polyether side chains, wherein the polyether side chains and phytic acid are connected by phosphate bonds, and the compound molecule The shape is linear or star-shaped, and the adsorption groups are exposed phosphoric acid monoester and phosphoric acid diester; the number of phosphoric monoester functional groups is 1-6, and the number of phosphoric acid diester functional groups is 1-6. The polyphosphate-based compound of the present invention regulates concrete air bubbles and air bubble stability, promotes initial dispersion, reduces the sensitivity of concrete to cement, sandstone aggregates, and water consumption, enhances the ability to resist sulfate and clay interference, and enhances the strength and durability of concrete . The method of the invention has the advantages of simple preparation process, high feasibility of industrialized production and broad 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/335C04B24/24C04B103/30C04B103/48
CPCC08G65/3353C04B24/246C04B2103/302C04B2103/304C04B2103/48
Inventor 刘加平陈伟乐王涛王啟铜宋神友杨勇刘健舒鑫冉千平金文良徐文周栋梁黄振杨福林
Owner SOUTHEAST UNIV
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