Inorganic dispersing agent for improving rheological property of geopolymer slurry as well as preparation method and application of inorganic dispersing agent

A technology of inorganic dispersants and geopolymers, applied in the field of inorganic dispersants for improving the rheological properties of geopolymer slurries and its preparation, can solve the problems affecting the popularization of geopolymer materials, slurry forming and pumping operations and other problems, to achieve the effects of promoting application, low price, and easy preparation process

Active Publication Date: 2018-06-29
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brings great difficulties to the molding and pumping operations of the slurry,

Method used

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  • Inorganic dispersing agent for improving rheological property of geopolymer slurry as well as preparation method and application of inorganic dispersing agent
  • Inorganic dispersing agent for improving rheological property of geopolymer slurry as well as preparation method and application of inorganic dispersing agent
  • Inorganic dispersing agent for improving rheological property of geopolymer slurry as well as preparation method and application of inorganic dispersing agent

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preparation example Construction

[0020] The present embodiment also provides the preparation method of the inorganic dispersant for improving the rheological properties of the geopolymer slurry, which includes:

[0021] Step S1. Chemical etching: the fly ash particles are mixed with lye and stirred at 50-80° C. for 1-6 hours.

[0022] Mix fly ash particles with lye, and carry out chemical etching under constant stirring at 50-80°C (or 60-70°C; or 63-68°C) to construct rough particle surfaces. The etched fly ash microspheres such as figure 1 As shown, nanoscale particles and pit structures have been formed on the surface of the microspheres, which can reduce the wettability of the fly ash microspheres in the liquid phase.

[0023] Further, the alkali solution has a concentration of 5-10 mol / L, or 6-9 mol / L, or 7-8 mol / L. The solid-to-liquid ratio of the fly ash particles to the lye is 1:25-35, or 1:26-34; or 1:28-32; or 1:29-31. Preferably, the lye is NaOH solution or KOH solution.

[0024] Further, the pa...

Embodiment 1

[0037] This embodiment provides an inorganic dispersant for improving the rheological properties of geopolymer slurry, and its preparation method comprises:

[0038] Pass the primary fly ash through a 180-mesh square hole sieve, and take the sieved residue to obtain spherical fly ash particles with a particle size of less than 80 μm. Mix fly ash particles with ethanol solution for ultrasonic cleaning, after cleaning, mix with NaOH solution (8mol / L) at a solid-to-liquid ratio of 1:30, stir for 3 hours under hydrothermal conditions at 50°C for chemical etching, and rough particle surfaces .

[0039] Using ethanol as a solvent, heptadecafluorodecyltrimethoxysilane was added to prepare a 1 wt% heptadecafluorodecyltrimethoxysilane / ethanol solution. The roughened fly ash particles were mixed with the prepared solution, and immersed at 60°C for 1 hour to perform low-energy surface modification. After impregnating the microspheres at 105 °C in N 2 Dry under ambient conditions for 2...

Embodiment 2

[0042] This embodiment provides an inorganic dispersant for improving the rheological properties of geopolymer slurry, and its preparation method comprises:

[0043] Pass the primary fly ash through a 180-mesh square hole sieve, and take the sieved residue to obtain spherical particles with a particle size of less than 80 μm. Mix fly ash particles with ethanol solution for ultrasonic cleaning, after cleaning, mix with prepared 10mol / L NaOH solution at a solid-to-liquid ratio of 1:30, stir for 2 hours under hydrothermal conditions at 70°C for chemical etching, the structure is rough particle surface.

[0044] Using ethanol as a solvent, add heptadecafluorodecyltriethoxysilane to configure a 1wt% heptadecafluorodecyltriethoxysilane / ethanol solution, and mix the roughened fly ash particles with the prepared solution , dipped at 60°C for 1h to perform low-energy surface modification. After impregnating the fly ash particles at 105 °C in N 2 Dry under ambient conditions for 2 ho...

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Abstract

The invention provides an inorganic dispersing agent for improving the rheological property of geopolymer slurry as well as a preparation method and application of the inorganic dispersing agent, andrelates to the field of production and preparation of building materials. The preparation method of the inorganic dispersing agent comprises the following steps: mixing coal ash particles and alkalineliquor, stirring for 1-6 hours at the temperature of 50-80 DEG C, then mixing the coal ash particles and solution containing low-surface-energy substances, and dipping for 0.5-1.5 hours at the temperature of 55-65 DEG C. The inorganic dispersing agent prepared by the method has a hydrophobic surface and also has the beneficial effects that a ball effect can be exerted in high-alkalinity and high-viscosity geopolymer slurry, the plastic viscosity can be reduced and the rheological property of the geopolymer slurry can be improved.

Description

technical field [0001] The invention relates to the field of production and preparation of building materials, in particular to an inorganic dispersant for improving the rheological properties of geopolymer slurry, its preparation method and application. Background technique [0002] Geopolymer is a kind of green inorganic gelling material prepared by reacting active aluminum-siliceous raw materials (metakaolin, fly ash and slag, etc.) with alkaline activators. Geopolymers have excellent properties such as early strength, compactness and corrosion resistance, and can make high-value use of industrial waste, so they have broad application prospects in special engineering fields such as rapid repair and solid waste treatment. [0003] However, since the preparation process of the geopolymer requires the use of a strongly alkaline and high-viscosity solution made of sodium hydroxide and water glass as the activator, this leads to poor rheological properties of the geopolymer sl...

Claims

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Application Information

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IPC IPC(8): C04B22/00C04B103/40
CPCC04B22/0006C04B2103/408
Inventor 杨涛诸华军吴其胜田亮高璇黎涛
Owner YANCHENG INST OF TECH
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