An airgel composite sound-absorbing structure
An airgel and sound-absorbing technology, which is applied in the field of sound-absorbing structures and airgel composite sound-absorbing structures, can solve the problems of limited quantity, poor low-frequency sound wave absorption effect, and large millimeter-scale holes, etc., achieving huge application potential and market Effect of outlook, excellent heat insulation, excellent absorption effect
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[0050] (1) Preparation of silica sol, mix and stir organosilane, dilute hydrochloric acid, deionized water, and organic solvent, react at 0~70°C for 4~60h, add alkali solution, stir, and react for 0.01~1h to obtain silica sol, Among them, the volume ratio of organosilane, deionized water, organic solvent, dilute hydrochloric acid and alkali solution is 1:0.05~5:0.5~8:0.0025~0.5:0.0025~0.5;
[0051] (2) Preparation of composite gel, pour the prepared silica sol into a mold with a through-hole type high damping metal foam, and gel;
[0052] (3) Drying, drying the composite gel to obtain a heat-insulating and sound-absorbing part.
[0053] In this embodiment, short fibers are added in the step (1).
[0054] In this way, the short fibers of the present invention can be polypropylene fibers, aramid fibers, carbon fibers, etc., and the addition of short fibers can further improve the sound insulation and sound absorption performance of the composite material, because when the sound...
Embodiment 1
[0080] The heat-insulating and sound-absorbing parts are prepared through the following steps:
[0081] (1) At 40°C, mix and stir methyl orthosilicate, deionized water, methanol, and dilute hydrochloric acid, stir and react for 40 hours, then add dilute ammonia, stir, and react for 0.5 hours to obtain silica sol, in which methyl orthosilicate The volume ratio of ester, deionized water, methanol, dilute hydrochloric acid and dilute ammonia water is 1:0.1:0.5:0.0025:0.025, and the concentration of dilute hydrochloric acid and dilute ammonia water is 0.3mol / L;
[0082] (2) Use a mixture of alkylphenol polyoxyethylene ether and water (mass ratio 1:90) to clean and wet the through-hole type high damping Mn-Cu foam alloy;
[0083] (3) Pour the silica sol in step (1) into a mold with a through-hole type high damping Mn-Cu foam alloy, and gel;
[0084] (4) CO 2 Supercritical drying to obtain heat-insulating and sound-absorbing parts.
[0085] An airgel composite sound-absorbing str...
Embodiment 2
[0087] The heat-insulating and sound-absorbing parts are prepared through the following steps:
[0088] (1) At 0°C, mix and stir ethyl orthosilicate, deionized water, ethanol, and dilute hydrochloric acid, stir and react for 60 hours, then add aqueous sodium hydroxide solution, stir, and react for 1 hour to obtain silica sol, in which orthosilicic acid The volume ratio of ethyl ester, deionized water, ethanol, dilute hydrochloric acid, and aqueous sodium hydroxide solution is 1:0.05:8:0.5:0.0025, and the concentration of dilute hydrochloric acid and aqueous sodium hydroxide solution is 0.3mol / L;
[0089] (2) Use a mixture of sodium dodecylbenzenesulfonate and water (mass ratio 1:50) to clean and wet through-hole Cu-Zn-Al shape memory foam alloy;
[0090] (3) Pour the silica sol in step (1) into a mold with a through-hole Cu-Zn-Al shape memory foam alloy, and perform ultrasonic treatment at the same time to gel;
[0091] (4) Hydrophobic modification of the composite gel in step ...
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