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
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[0031] Example 1:
[0032] The specific process steps of this 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 concentration of metal ions 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; reaction temperature is 30℃;
[0034] (2) 5g prepared MgAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;
[0035] (3) Add 20g of lightly burned powder to the above suspension, stir it evenly, then pour it into the mold, use a vibrating table to flatten the surface and shake out the bubbles;
[0036] (4) After leaving the mold at room temperature for 12 hours, the demolded cement block is placed in the air at room temperature for 28 days.
[0037] (5) Put the above cement block into a constant temperatur...
Example Embodiment
[0039] Example 2:
[0040] The specific process steps of this 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 sufficient at 30°C Mix and react to get MgAl-NO 3 -LDH precipitate, disperse it in a sodium laurate solution with a concentration of 0.1 mol / l, stir at room temperature for 24 hours and centrifuge to obtain laurate-modified hydrotalcite-like nanosheets, denoted as LA-MgAl-NO 3 -LDH;
[0042] (2) Put 5g of prepared LA-MgAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;
[0043] (3) Add 20g of lightly burned powder to the above suspension, stir it evenly, then pour it into the mold, use a vibrating table to flatten the surface and shake out the bubbles;
[0044] (4) After le...
Example Embodiment
[0047] Example 3:
[0048] The specific process steps of this embodiment are:
[0049] (1) Zn(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 a sodium hydroxide solution with a concentration of 0.2mol / l; use a microchannel reactor to make the mixed salt solution and hydroxide at room temperature Sodium solution is thoroughly mixed and reacted to obtain ZnAl-NO 3 -LDH precipitate, disperse it in a sodium lauryl sulfate solution with a concentration of 0.5 mol / l, stir at room temperature for 24 hours and centrifuge to obtain dodecyl sulfate-modified hydrotalcite-like nanosheets, denoted as SUL- ZnAl-NO 3 -LDH;
[0050] (2) 5g prepared SUL-ZnAl-NO 3 -LDH is fully dispersed in 15ml saturated magnesium chloride solution;
[0051] (3) Add 20g of light burned powder and 2g of fly ash to the above suspension, stir quickly evenly, then pour it into the mold, use a vibrating tabl...
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