A kind of super heat insulation airgel foam concrete and preparation method thereof

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 invention relates to a preparation method of a building thermal insulation material, in particular to a super heat insulating airgel foam concrete and a preparation method thereof, belonging to the fields of light weight, heat insulation, fire prevention, sound insulation materials and the like. Background technique [0002] With the progress of society, problems such as energy crisis and environmental degradation are becoming more and more serious. In 2006, the "Outline of the Eleventh Five-Year Plan for National Economic and Social Development" put forward the concept of "energy saving and emission reduction" for the first time. %, and the binding target of reducing the total discharge of major pollutants by 10%. "Energy saving" promotes "emission reduction". In the total energy consumption of domestic production, building energy consumption accounts for 33%. Building energy conservation is the top priority of my country's energy conservation an...

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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

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