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Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof

A porous material, magnesium sulfate technology, applied in the field of building materials, can solve the problems of low strength of light materials, unstable hydration products, poor durability, etc., and achieve the effect of high durability, fast speed and high strength

Active Publication Date: 2022-06-03
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, magnesium oxysulfide cement-based lightweight materials are prepared by mixing foam, rice husk or both into the magnesium oxysulfide cement matrix, but MgO-MgSO in magnesium oxysulfide cement 4 -H 2 The O ternary gel system is an unstable non-equilibrium state, and its hydration products are unstable and easily affected by external conditions such as temperature and humidity, so that the phases of the system undergo mutual transformation, and the lightweight material The pore structure in the medium has a large pore size, which leads to problems such as low strength and poor durability of lightweight materials

Method used

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  • Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof
  • Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof
  • Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof

Examples

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Embodiment 1

[0023] A basic magnesium sulfate cement-based lightweight porous material, the cement-based lightweight porous material is mainly obtained by mixing magnesium oxysulfate cement slurry with a modifier, adding bentonite as a pore-forming agent, mixing and stirring, and coagulating and hardening. of porous materials.

[0024] The preparation steps of the basic magnesium sulfate cement-based lightweight porous material in the present embodiment are as follows:

[0025] S1. Lightly burn MgO or lightly burn dolomite with MgSO 4 , and water are mixed and stirred evenly to obtain magnesium oxysulfide cement slurry;

[0026] S2, adding a modifier into the magnesium oxysulfate cement slurry to modify the magnesium oxysulfate cement slurry to obtain a basic magnesium sulfate cement slurry;

[0027] S3, adding a pore-forming agent into the basic magnesium sulfate cement slurry, stirring uniformly, then forming, and demoulding and curing to obtain a basic magnesium sulfate cement-based l...

Embodiment 2

[0031] In this example, the benchmark mixing ratio of magnesium oxysulfate cement is: molar ratio MgO:MgSO 4 :H 2 O=20:1:18, 0.08% citric acid and 0.08% EDTA were selected as admixtures for compound blending. On the basis of the reference mixing ratio, bentonite is used as a pore-forming agent, and is prepared into a pore-forming agent slurry according to the ratio of pore-forming agent: water (mass ratio) of 1:5, and after standing for 24 hours, according to the pore-forming agent slurry The basic magnesium sulfate cement-based lightweight porous materials with different dry densities are prepared in different proportions of the basic magnesium sulfate cement slurry volume. ×160mm standard mold forming. Curing after demoulding, the curing conditions are temperature 15-25 DEG C, humidity 50-70%, to obtain basic magnesium sulfate cement-based light porous material.

[0032] In this example, the pore-forming agent slurry accounts for 0-60% of the basic magnesium sulfate cemen...

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Abstract

The invention relates to the field of building materials, and discloses a basic magnesium sulfate cement-based lightweight porous material and a preparation method thereof. In the present invention, the magnesium oxysulfide cement slurry is modified to form basic magnesium sulfate cement slurry, and the slurry produces 5.1.7 phase, 3.1.8 phase and 5.1.3 phase crystals in the process of setting and hardening. phase, the coagulation and hardening speed of the slurry is fast, and the 5·1·7 equal hydration products overlap to form a microscopic pore structure; the main mineral montmorillonite in the mixed bentonite exists in the 5·1·7 equal hydration products. In the microscopic pore structure, cut and refine this part of the pores to produce nano- and micro-pores, realize the construction of nano-pores and micro-pores in basic magnesium sulfate cement-based lightweight porous materials, and make the originally loose pore structure dense, and obtain The basic magnesium sulfate cement-based lightweight porous material has the advantages of early strength, high strength, low thermal conductivity, and high durability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a basic magnesium sulfate cement-based lightweight porous material and a preparation method thereof. Background technique [0002] In my country, MgSO 4 ·7H 2 O reserves are relatively abundant, and the reserves of magnesium sulfate resources in salt lake brine are about 1.673 billion tons; in seawater, MgSO 4 ·7H 2 O has reached a reserve of about 3570 trillion tons. At room temperature, light-fired active MgO will interact with MgSO 4 ·7H 2 O solution reacts to form magnesium oxysulfide hydrate Mg x (OH) y (SO 4 ) z ·nH 2 O. The compound has the characteristics of fast setting and hardening, high early strength, good bonding performance, no need for wet curing, low thermal conductivity, high fire resistance and good corrosion resistance, and the preparation process is simple, and can be widely used in the production of thermal insulation materials, fire-re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/30C04B38/08C04B9/04
CPCC04B28/30C04B9/04C04B2201/20C04B14/104C04B24/06C04B24/123C04B22/0013C04B24/10C04B22/165C04B22/16C04B24/04C04B38/08C04B38/0067Y02W30/91
Inventor 蒋俊李军卢忠远
Owner SOUTHWEAT UNIV OF SCI & TECH
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