A kind of indoor thick steel structure fireproof coating and preparation method thereof
A technology for fire-resistant coatings and steel structures, applied in the direction of fire-resistant coatings, alkali metal silicate coatings, coatings, etc., can solve the problems of aggravating the smoke generation of fire-resistant coatings, loss of bearing capacity, coating aging, etc., and achieve good slurry coating Ability, avoid cracking, avoid the effect of shedding
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[0054] In the present invention, the acid leaching filtrate obtained in the preparation process of the sodium silicate solution is preferably taken, and the pH is adjusted to 11-13 to obtain an alkaline solution.
[0055] In the present invention, the pH adjustment is preferably by adding an alkaline solution, and the alkaline solution is preferably a sodium hydroxide solution; the mass concentration of the alkaline solution is 15-25%, more preferably 18-22%.
[0056] After the alkaline solution is obtained, the present invention preferably passes excess carbon dioxide into the alkaline solution to obtain a suspension and then remove the solvent to obtain aluminum hydroxide.
[0057] In the present invention, the rate and time of introducing carbon dioxide are not particularly limited, as long as the components in the alkaline solution can be fully reacted.
[0058] In the present invention, the method of removing the solvent after obtaining the suspension is preferably drying...
Embodiment 1
[0087] The specific preparation steps of the indoor thick steel structure fireproof coating prepared in this embodiment are as follows:
[0088] Pass the fly ash hollow microspheres through an 80-mesh standard sieve, and take the unsieved microspheres (particle size > 180 μm) for ball milling at a speed of 300 r / min for 4 hours until the particle size is about 19 μm.
[0089] After the above-mentioned ball-milled fly ash hollow microspheres and the compound alkali are ground and mixed uniformly according to the mass ratio of 0.5:1, they are roasted at 700° C. for 1 hour to obtain nepheline; the compound alkali is sodium carbonate and sodium hydroxide, The mass ratio is 0.5:1.
[0090] The nepheline obtained in the above steps was acid-leached with 8% hydrochloric acid at 95°C for 10 minutes to obtain acid residue and acid leaching filtrate, wherein the mass ratio of liquid to solid during acid leaching was 15:1.
[0091] The acid slag obtained in the above steps is added to s...
Embodiment 2
[0098] The specific preparation steps of the indoor thick steel structure fireproof coating prepared in this embodiment are as follows:
[0099] Pass the fly ash hollow microspheres through an 80-mesh standard sieve, and take the unsieved microspheres (particle size > 180 μm) for ball milling at a speed of 400 r / min for 5 hours until the particle size is about 17 μm.
[0100] After the above-mentioned ball-milled fly ash hollow microspheres and the compound alkali are ground and mixed uniformly according to a mass ratio of 1:1, they are roasted at 790° C. for 2 hours to obtain nepheline; the compound alkali is sodium carbonate and sodium hydroxide, Its mass ratio is 1:1.
[0101] The nepheline obtained in the above steps was pickled with hydrochloric acid with a mass concentration of 12% at 80°C for 15 minutes to obtain acid residue and acid leach filtrate, wherein the mass ratio of liquid to solid during acid leaching was 12:1.
[0102] The acid slag obtained in the above st...
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Abstract
Description
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Application Information
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