A kind of microcapsule chloride ion curing agent and its preparation method and application
A chloride ion and microcapsule technology, applied in the field of microcapsule chloride ion curing agent and its preparation, can solve problems such as low curing efficiency of free chloride ions, and achieve extended service life of the structure, simple preparation process, huge economic and social benefits Effect
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Embodiment 1
[0036] A microcapsule chloride ion curing agent is prepared from 100-125 parts of stearic acid, 8-15 parts of organic solvent, and 30-37 parts of amorphous aluminum hydroxide powder in parts by weight; The shaped aluminum hydroxide powder consists of 150-170 parts of Al 2 (SO 4 ) 3 18H 2 O, 250-300 parts of deionized water and NaOH solution with a concentration of 80-100g / L.
[0037] The microcapsule chloride ion curing agent of this embodiment uses stearic acid as the carrier of amorphous aluminum hydroxide to coat amorphous aluminum hydroxide. Because of the uniform structure of stearic acid, it has a better coating effect, and Stearic acid is stable in the cement slurry forming stage, so that the prepared microcapsule chloride ion curing agent can exist stably in the cement concrete slurry, avoiding the influence of amorphous aluminum hydroxide and stearic acid on the working performance and coagulation of the cement slurry Over time, as the cement hydration proceeds, t...
Embodiment 2
[0052] A microcapsule chloride ion curing agent, which is specifically prepared through the following steps:
[0053] 1) In parts by weight, 150 parts of Al 2 (SO 4 ) 3 18H 2 O was dissolved in 250 parts of deionized water and stirred rapidly with a magnetic stirrer to make Al 2 (SO 4 ) 3 18H 2 O dissolves to form solution A;
[0054] 2) Slowly add NaOH solution with a concentration of 80g / L into solution A at a uniform speed to form solution B;
[0055] 3) Detect the pH value of solution B. When the pH value of solution B reaches 5.0 ± 0.2, stop adding the NaOH solution dropwise, then stir at a speed of 180rpm for 5h, and leave it to stand for 8h after the stirring is completed to obtain a solution containing Al(OH). ) 3 Precipitated solution C;
[0056] 4) Use a steady-speed electric centrifuge to centrifuge solution C at a speed of 3500rpm, wherein the time for each centrifugation is 4min, and use deionized water to clean the centrifuged Al(OH) after centrifugatio...
Embodiment 3
[0061] A microcapsule chloride ion curing agent, which is specifically prepared through the following steps:
[0062] 1) by weight, 170 parts of Al 2 (SO 4 ) 3 18H 2 O was dissolved in 300 parts of deionized water and stirred rapidly with a magnetic stirrer to make Al 2 (SO 4 ) 3 18H 2 O dissolves to form solution A;
[0063] 2) Slowly add NaOH solution with a concentration of 100g / L into solution A to form solution B;
[0064] 3) Detect the pH value of solution B. When the pH value of solution B reaches 5.0 ± 0.2, stop adding the NaOH solution dropwise, then stir for 7 hours at a speed of 200 rpm, and leave it to stand for 9 hours after the stirring to obtain a solution containing Al(OH). ) 3 Precipitated solution C;
[0065] 4) Use a steady-speed electric centrifuge to centrifuge solution C at a speed of 4000rpm, wherein the time for each centrifugation is 6min, and use deionized water to clean the centrifuged Al(OH) after centrifugation 3 Precipitate until the cl...
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