Polyphosphate compound as well as preparation method and application thereof

A polyphosphoric acid and compound technology, applied in the field of concrete admixtures, can solve the problems of reducing the sensitivity of concrete, poor workability, etc., and achieve the effects of improving the performance of hardened concrete, simple and feasible process, and improving workability

Active Publication Date: 2021-05-07
SOUTHEAST UNIV +3
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  • Abstract
  • Description
  • 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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  • Polyphosphate compound as well as preparation method and application thereof
  • Polyphosphate compound as well as preparation method and application thereof
  • Polyphosphate compound as well as preparation method and application thereof

Examples

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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 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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