A kind of airgel fiber mat composite material and preparation method thereof
A technology for composite materials and fiber mats, which is applied in the field of airgel fiber mat composite materials and its preparation, can solve the problems of high cost, harsh technical conditions, and high equipment requirements, and achieves reduced manufacturing costs, simple and easy methods, and improved mechanical properties. performance effect
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[0023] The invention provides a kind of preparation method of airgel fiber felt composite material, comprises the following steps:
[0024] A) mixing and impregnating the inorganic fiber felt with the sol to obtain the sol fiber felt;
[0025] B) Electrolyzing the sol fiber mat under vacuum conditions to obtain an airgel fiber mat composite material.
[0026] According to the present invention, firstly, the inorganic fiber mat is mixed and impregnated with the sol to obtain the sol fiber mat.
[0027] In the present invention, the inorganic fiber mat is preferably made of inorganic fibers, and the inorganic fibers are preferably one or more of glass fibers, ceramic fibers, slag wool fibers and rock wool fibers; the source of the inorganic fibers does not have Special restrictions, general commercial products can be. In the present invention, there is no special limitation on the method of making inorganic fiber mats from inorganic fibers, and conventional production methods ...
Embodiment 1
[0036] The ceramic fiber is needle-punched into a ceramic fiber mat, and the ceramic fiber mat is soaked in silica sol with a solid content of 20% to obtain a sol fiber mat precursor. The soaked sol fiber mat precursor is sucked off excess water through a vacuum pump to obtain a sol fiber mat with a water content of 30%. Put the sol fiber mat in a vacuum device connected to a DC electrode, and electrolyze it for 30 minutes under the vacuum condition of 0.08MPa and the electrolysis condition of 150V, and discharge the oxygen and hydrogen gas electrolyzed during the electrolysis process. After the electrolysis is completed, Get a density of 300Kg / m 3 airgel fiber felt composites.
[0037] The performance test of the airgel fiber mat composite material obtained shows that the thermal conductivity of the composite material at 25°C is 0.013W / m·k, and the compressive strength is 2.1MPa.
Embodiment 2
[0039] The glass fiber is needle-punched into a glass fiber mat, and the glass fiber mat is soaked in an aqueous solution of aluminum sol with a solid content of 20% to obtain a sol fiber mat precursor. The soaked sol fiber mat precursor is sucked off excess water through a vacuum pump to obtain a sol fiber mat with a water content of 70%. Put the sol fiber mat in a vacuum device connected to a DC electrode, and electrolyze it for 40 minutes under the vacuum condition of 0.095MPa and the electrolysis condition of 250V, and discharge the oxygen and hydrogen gas electrolyzed during the electrolysis process. After the electrolysis is completed, Get a density of 200Kg / m 3 airgel fiber felt composites.
[0040]The performance test of the airgel fiber mat composite material obtained shows that the thermal conductivity of the composite material at 25°C is 0.011W / m·k, and the compressive strength is 1.8MPa.
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Abstract
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