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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.

Active Publication Date: 2017-10-20
NANJING WEICAI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the following technical bottlenecks are encountered in the development of airgel foam concrete: (1) Due to the large difference in density between airgel powder and concrete, phase separation between the two is easy to occur during the mixing process, resulting in air condensation It is difficult for the glue to be evenly distributed in the concrete system, resulting in a serious decline in the mechanical properties of the foamed concrete, and the improvement of the thermal insulation performance is not obvious; (2) During the preparation of the foamed concrete, the airgel nanoporous structure is easily destroyed by water and cement in the concrete The additives in the raw materials are destroyed, and the excellent thermal insulation properties of the airgel due to the nanoporous structure are lost; (3) The mechanical properties of the foamed concrete are significantly reduced due to the low interface strength between the airgel and the cementitious material. And it is easy to cause the airgel powder to fall off from the concrete matrix

Method used

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  • Super-thermal-insulation aerogel foamed concrete and preparation method thereof

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preparation example Construction

[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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Abstract

The invention discloses super-thermal-insulation aerogel foamed concrete and a preparation method thereof. The super-thermal-insulation aerogel foamed concrete is characterized by being prepared from aerogel powder and foamed concrete, wherein the aerogel powder comprises an inner hydrophobic layer and a surface hydrophilic layer, and the thickness of the surface hydrophilic layer is 0.1-100 mu m. The preparation method of the super-thermal-insulation aerogel foamed concrete comprises steps as follows: (1), the aerogel powder is modified; (2), the aerogel powder modified in the step (1) is subjected to dry blending with a cementitious material, and water is added to a mixture for wet blending; (3), a wet mixture obtained in the step (2) is mixed with a foaming agent for stirring. The aerogel foamed concrete can be widely applied to the fields of thermal insulation, fire protection and sound insulation of walls, fire protection of steel structures and the like.

Description

technical field [0001] The present invention relates to a kind of preparation method of building thermal insulation material, relate in particular to A kind of super heat insulation airgel foam concrete and preparation method thereof , belongs to the fields of light weight, heat insulation, fire prevention, sound insulation materials and so on. Background technique [0002] With the progress of society, problems such as energy crisis and environmental degradation are becoming more and more serious. year 2006," national The Outline of the Eleventh Five-Year Plan for Economic and Social Development puts forward the concept of "energy conservation and emission reduction" for the first time, and proposes that during the "Eleventh Five-Year Plan" period (2006-2010), the energy consumption per unit of GDP will be reduced by about 20%, and the main pollution A binding target of 10% reduction in total pollutant emissions. "Energy saving" promotes "emission reduction". In the tot...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/10C04B14/06C04B18/02C04B22/06C04B22/14C04B24/08C04B24/26C04B24/38C04B103/30
CPCC04B28/04C04B14/064C04B18/023C04B24/26C04B24/383C04B22/147C04B22/06C04B24/08C04B38/10C04B2103/302
Inventor 卢锋
Owner NANJING WEICAI NEW ENERGY TECH
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