Super-thermal-insulation aerogel foamed concrete and preparation method thereof
A technology of foam concrete and airgel, which is applied in the fields of heat insulation, fire prevention, light weight, and sound insulation materials, and can solve the problems of decreased mechanical properties of foam concrete, shedding of airgel powder, difficulty in uniform distribution of airgel, etc.
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[0025] A preparation method of super heat-insulating airgel foam concrete, comprising the following steps:
[0026] (1) Airgel powder modification;
[0027] (2) dry-mixing the airgel powder obtained in step (1) with the gelling material, and then adding water to wet-mix;
[0028] (3) Mix the wet mixture obtained in step (2) with the foaming agent and stir.
[0029] In addition, airgel powders with a particle size of 1-10000 μm are suitable for the present invention.
[0030] In addition, the step (2) of the present invention can also be to dry mix the gelling material, then add water to wet mix, and add the airgel powder obtained in step (1) during wet mixing.
[0031] In this way, the preparation method of the airgel foam concrete of the present invention has the advantages of simple process, short process cycle, waste utilization and environmental protection, and is suitable for industrial production.
[0032]In this embodiment, the step (1) includes a hydrophobic modific...
Embodiment 1
[0050] SiO was prepared using the following steps 2 Airgel foam concrete:
[0051](1) Detection of SiO to be treated using a contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 55°, and then SiO with a particle size of 56 μm 2 The airgel powder is placed in a vacuum heating furnace, and the weighed hexamethyldisilazane is placed in a vacuum heating furnace with a container, heated and vaporized, and hydrophobically modified for 1.5 hours to obtain hydrophobic SiO 2 Airgel powder, detection of hydrophobic SiO by contact angle meter 2 The contact angle between the surface of the airgel powder and water is 147°;
[0052] (2) At room temperature, weigh ethanol, n-hexane and deionized water at a mass ratio of 1:1:100, mix them evenly, and prepare a surface hydrophilic modification solution;
[0053] (3) According to hydrophobic SiO 2 The volume ratio of the airgel powder and the surface hydrophilic modification solutio...
Embodiment 2
[0062] SiO was prepared using the following steps 2 Airgel foam concrete:
[0063] (1) Detection of SiO to be treated using a contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 45°, and then SiO with a particle size of 67 μm 2 The airgel powder is placed in a vacuum heating furnace, and the weighed trimethylchlorosilane is placed in a vacuum heating furnace with a container, heated and vaporized, and hydrophobically modified for 1.5 hours to obtain hydrophobic SiO 2 Airgel powder, detection of hydrophobic SiO by contact angle meter 2 The contact angle between the surface of the airgel powder and water is 146°;
[0064] (2) At room temperature, weigh fatty alcohol polyoxyethylene ether sodium sulfate, sodium alkylbenzene sulfonate, n-hexane and deionized water according to the mass ratio of 1:1:1000, mix them evenly, and prepare the surface hydrophilic modification solution;
[0065] (3) According to hydrophobic S...
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