Aerogel felt and method for producing same
A technology of airgel felt and sol, which is applied in the direction of airgel preparation, chemical instruments and methods, textiles and papermaking, etc., can solve the problem of insufficient impregnation of precursor sol and gelling catalyst, reducing the thermal insulation performance of the final product, Problems such as the destruction of gelled airgel, to achieve the effect of easy gelation time, shortening gelation time, and reducing fluidity
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Embodiment 1
[0099]Precursor solutions prepared by mixing prehydrolyzed TEOS (HTEOS) as a gel precursor, ethanol, distilled water, and opacifier at a weight ratio of 1:0.35:0.77:0.015, and ethanol and ammonia water at 89 :1 weight ratio mixed prepared catalyst solution. The prepared precursor solution and the prepared catalyst solution were mixed (volume ratio 1:1) to prepare a catalytic sol. At this time, the viscosity of the catalytic sol was 5 mPa·s. The catalytic sol was introduced into the impregnation tank at a rate of 1.0 L / min. The sol was added to the impregnation tank in an amount of 33.3 L, and as a base material for the mat, fibers (glass fiber mat, 10 mm) were passed through the impregnation tank into which the catalytic sol was introduced to infiltrate the catalytic sol into the fibers, The fibers were simultaneously passed so that the fibers exiting the dip tank at a rate of 1.0 L / min, and the rate of introduction of the fibers into the dip tank was controlled such that th...
Embodiment 2 to Embodiment 6
[0101] In addition to adjusting the volume of the catalytic sol in the impregnating tank, the residence time of the catalytic sol in the impregnating tank, the viscosity of the catalytic sol when penetrating into the substrate for felt as shown in Table 1 below, the same method as in Example 1 Airgel mats are manufactured in the same manner as in .
Embodiment 7 to Embodiment 8
[0103] Precursor solutions prepared by mixing prehydrolyzed TEOS (HTEOS), ethanol, and distilled water as a gel precursor in a weight ratio of 1:0.35:1.21 were prepared, and by mixing ethanol and ammonia water in a weight ratio of 98:1 Mix the prepared catalyst solutions. The prepared precursor solution and the prepared catalyst solution were mixed (volume ratio 1:1) to prepare a catalytic sol. At this time, the viscosity of the catalytic sol was 1.8 mPa·s. An airgel felt was manufactured in the same manner as in Example 1, except that the above-prepared sol having a viscosity of 1.8 mPa·s was used as the catalytic sol and the impregnation conditions were adjusted as shown in Table 1 and Table 2 below.
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