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Anti-efflorescence magnesium oxychloride cement and preparation method thereof

A magnesium oxychloride cement and anti-halogenation technology, which is applied in the field of concrete, can solve the problems of low efficiency of halogenation, achieve low cost, good application prospects, and improve hydrophobic performance

Active Publication Date: 2018-07-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to seek a kind of anti-reflection magnesium oxychloride cement and its preparation method, to solve the problem of relying on 5.1.8 phase and 3.1.8 phase in magnesium cement in the prior art The crystal is covered with a layer of inorganic colloid or hydrophobic polymer, which leads to the problem of low efficiency of inhibiting halogen reversion

Method used

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  • Anti-efflorescence magnesium oxychloride cement and preparation method thereof
  • Anti-efflorescence magnesium oxychloride cement and preparation method thereof
  • Anti-efflorescence magnesium oxychloride cement and preparation method thereof

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Embodiment 1

[0032] The concrete processing steps of the present embodiment are:

[0033] (1) Mg(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml of deionized water to prepare a mixed salt solution with a total metal ion concentration of 0.1mol / l; prepare 50ml of a sodium hydroxide solution with a concentration of 0.2mol / l; use a microchannel reactor to make the mixed salt solution and sodium hydroxide solution Mix well and react to get MgAl-NO 3 - LDH precipitate; the reaction temperature is 30°C;

[0034] (2) 5g prepared MgAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;

[0035] (3) Add 20g of lightly burnt powder to the above suspension, stir quickly and evenly, then pour it into the mold, use a vibrating table to level the surface and shake out the air bubbles;

[0036] (4) Demoulding after being placed at room temperature for 12 hours, and the cement block after demoulding was placed in air for 28 days at room temperature.

[0037] (5) Put the above-men...

Embodiment 2

[0040] The concrete processing steps of the present embodiment are:

[0041] (1) Mg(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml of deionized water to prepare a mixed salt solution with a total concentration of metal ions of 0.1mol / l; prepare 50ml of ammonia solution with a concentration of 7%; use a microchannel reactor to make the mixed salt solution and sodium hydroxide solution fully Mix and react to get MgAl-NO 3 -LDH precipitate, which is dispersed in a sodium laurate solution with a concentration of 0.1mol / l, stirred at room temperature for 24 hours, and then centrifuged to obtain lauric acid-modified hydrotalcite-like nanosheets, denoted as LA-MgAl-NO 3 -LDH;

[0042] (2) 5g of prepared LA-MgAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;

[0043] (3) Add 20g of lightly burnt powder to the above suspension, stir quickly and evenly, then pour it into the mold, use a vibrating table to level the surface and shake out the air bubbles;

...

Embodiment 3

[0048] The concrete processing steps of the present embodiment are:

[0049] (1) Zn(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml deionized water to prepare a mixed salt solution with a total metal ion concentration of 0.1mol / l; prepare 50ml of a sodium hydroxide solution with a concentration of 0.2mol / l; use a microchannel reactor to oxidize the mixed salt solution and hydroxide at room temperature The sodium solution is fully mixed and reacted to obtain ZnAl-NO 3 -LDH precipitate, which is dispersed in a sodium dodecyl sulfate solution with a concentration of 0.5 mol / l, stirred at room temperature for 24 hours, and then centrifuged to obtain dodecyl sulfate-modified hydrotalcite-like nanosheets, denoted as SUL- ZnAl-NO 3 -LDH;

[0050] (2) 5g of prepared SUL-ZnAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;

[0051] (3) Add 20g of lightly burnt powder and 2g of fly ash into the suspension, stir quickly and evenly, then pour it into the mold...

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Abstract

The invention discloses anti-efflorescence magnesium oxychloride cement which comprises the following components in parts by weight: 0.1-0.5 parts of an anti-efflorescence agent, 1.5-2.5 parts of magnesium chloride, 4-5 parts of a cementing agent and 2-3 parts of water, wherein the cementing agent is one or more of caustic calcined magnesia, fly ash, microsilica and latex powder; the anti-efflorescence agent is an ultrathin hydrotalcite nanosheet prepared by using a microchannel reactor for coprecipitation reaction; the ultrathin hydrotalcite nanosheet is further modified with a surfactant specifically by the following modification process: dispersing the ultrathin hydrotalcite nanosheet in 0.001-0.5 mol / l of a surfactant solution. An LDH nanosheet prepared by the microreactor has an ultrathin structure and a relatively large specific surface area after dispersion, can effectively capture free chloride ions in the cement material, forms LDH of a chloride ion intercalation layer, and avoids migration of chloride ions to a cement surface to cause efflorescence; and hydrotalcite-like nanosheets are further modified with the surfactant.

Description

Technical field: [0001] The invention belongs to the technical field of concrete, and relates to an anti-reflection magnesium oxychloride cement and a preparation method thereof. Ultrathin hydrotalcite-like nanosheets prepared by co-precipitation reaction in a microchannel reactor or modified with long carbon chain surfactants As an anti-halogenation agent, hydrotalcite-like nanosheets can effectively capture free chloride ions in magnesium cement, and are especially suitable for inhibiting the halogenation of magnesium cement. Background technique: [0002] my country is rich in magnesite resources, and its reserves rank among the top in the world. Compared with foreign magnesite resources, it has obvious advantages, and the ore has excellent texture, high magnesium oxide content, simple deposit types, concentrated reserves, and easy mining and selection. Magnesium cement mainly includes magnesium oxychloride cement, magnesium oxysulfide cement, and magnesium oxyphosphate c...

Claims

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Application Information

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IPC IPC(8): C04B9/02C04B22/06
CPCC04B9/02C04B22/06
Inventor 庞秀江李少香陈利
Owner QINGDAO UNIV OF SCI & TECH
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