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A kind of high-strength water-resistant magnesium oxychloride cement and preparation method thereof

A technology of magnesium oxychloride cement and magnesium chloride hexahydrate, applied in the field of water-resistant magnesium oxychloride cement and its preparation, high strength, can solve the problem of reducing the compressive strength of magnesium oxychloride cement, reducing the strength of magnesium oxychloride cement, low water resistance, etc. problems, to achieve sustainable development, reduce chemical properties, and enhance water resistance

Active Publication Date: 2021-07-30
卢迎宾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low water resistance of magnesium oxychloride cement, and problems such as returning halogen and blooming during use seriously limit its development.
The strength of magnesium oxychloride cement mainly comes from the five-phase crystals (5Mg(OH) 2 · MgCl 2 ·8H 2 O)), but the five phases are easily transformed into three-phase crystals (3Mg(OH) 2 · MgCl 2 ·8H 2 O)) and magnesium hydroxide, thereby reducing the strength of magnesium oxychloride cement
In previous studies, additives such as phosphoric acid, phosphate, and sulfate are usually used to modify the water resistance of magnesium oxychloride cement, but adding these modifiers will reduce the compressive strength of magnesium oxychloride cement

Method used

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  • A kind of high-strength water-resistant magnesium oxychloride cement and preparation method thereof
  • A kind of high-strength water-resistant magnesium oxychloride cement and preparation method thereof
  • A kind of high-strength water-resistant magnesium oxychloride cement and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Dissolve 1-2 parts of sodium polyacrylate in 90-100 parts of water, and stir evenly at room temperature to form a sodium polyacrylate solution;

[0034] (2) Add 150-170 parts of magnesium chloride hexahydrate to the sodium polyacrylate solution prepared in (1), and stir evenly;

[0035] (3) Mix 235-250 parts of light-burned heavy magnesia with 4-10 parts of cornstarch evenly, then add to the mixed solution in step (2) and stir for 5 minutes to form a uniform cement slurry;

[0036] (4) Pour into the mold and vibrate, and release the mold after curing at room temperature for 24 hours;

[0037] (5) Curing at 25±2°C for 28 days after demoulding to obtain this high-strength, water-resistant magnesium oxychloride cement.

Embodiment 2

[0039] (1) Dissolve 2 to 4 parts of sodium polyacrylate in 90 to 100 parts of water, and stir evenly at room temperature to form a sodium polyacrylate solution;

[0040] (2) Add 150-170 parts of magnesium chloride hexahydrate to the sodium polyacrylate solution prepared in (1), and stir evenly;

[0041] (3) Mix 235-250 parts of light-burned heavy magnesia with 4-10 parts of cornstarch evenly, then add to the mixed solution in step (2) and stir for 5 minutes to form a uniform cement slurry;

[0042] (4) Pour into the mold and vibrate, and release the mold after curing at room temperature for 24 hours;

[0043] (5) Curing at 25±2°C for 28 days after demoulding to obtain this high-strength, water-resistant magnesium oxychloride cement.

Embodiment 3

[0045] (1) Dissolve 4-6 parts of sodium polyacrylate in 90-100 parts of water, and stir evenly at room temperature to form a sodium polyacrylate solution;

[0046] (2) Add 150-170 parts of magnesium chloride hexahydrate to the sodium polyacrylate solution prepared in (1), and stir evenly;

[0047] (3) Mix 235-250 parts of light-burned heavy magnesia with 4-10 parts of cornstarch evenly, then add to the mixed solution in step (2) and stir for 5 minutes to form a uniform cement slurry;

[0048] (4) Pour into the mold and vibrate, and release the mold after curing at room temperature for 24 hours;

[0049] (5) Curing at 25±2°C for 28 days after demoulding to obtain this high-strength, water-resistant magnesium oxychloride cement.

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Abstract

The present invention discloses a kind of high-quality magnesium oxide, which comprises the following components in parts by weight for preparation: 235-335 parts of light-burned heavy magnesium oxide, 150-170 parts of magnesium chloride hexahydrate, 90-100 parts of water, and 4-20 parts of corn starch , 1 to 15 parts of sodium polyacrylate, when preparing, dissolve sodium polyacrylate in water, stir evenly at room temperature to form a sodium polyacrylate solution; add magnesium chloride hexahydrate into the sodium polyacrylate solution, stir evenly; The burnt heavy magnesia and cornstarch are mixed evenly, then added to the mixed solution and stirred for 5 minutes to form a uniform cement slurry; poured into the mold to be vibrated, cured at room temperature for 24 hours, and then demoulded; after demoulding, 25 The high-strength, water-resistant magnesium oxychloride cement is obtained by curing under the condition of ±2° C. for 28 days. The preparation process of the invention is simple, the source of raw materials is abundant, the cost is low, and the industrialized production is easy to be realized.

Description

technical field [0001] The invention relates to the field of inorganic gel materials, in particular to a high-strength, water-resistant magnesium oxychloride cement and a preparation method thereof. Background technique [0002] Currently, the most commonly used cement in construction is Portland cement. However, Portland cement is calcined at a high temperature during the production process, releasing a large amount of carbon dioxide (accounting for about 5%-7% of the carbon dioxide produced by humans), which intensifies the global greenhouse effect, and requires a large amount of wet curing during the preparation process. water resources. With the increasing concern for the environment, the development of green cement has become a development trend. [0003] Magnesium oxychloride cement (MOC) is a low-carbon cement that has the advantages of low alkalinity, short curing time, high mechanical strength, good wear resistance and no need for moisture curing compared with tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/32C04B111/27
CPCC04B28/32C04B2111/27C04B24/38C04B24/2641
Inventor 李建章叶倩倩韩宇飞高强周文瑞张世锋龚珊珊李炯炯张玉强
Owner 卢迎宾
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