Preparation method of ammonification elastic silicon-based composite aerogel
A composite airgel and aerogel technology, applied in the direction of airgel preparation, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of airgel with few amino groups and easy falling off of amino groups, and achieve high brittleness and good Application prospect, effect of strong metal ion chelating ability
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Embodiment 1
[0034] Example 1: Preparation of GO-free ammoniated elastic silicon-based airgel samples
[0035] Include the following steps:
[0036] (1) Preparation of GO-free ammoniated elastic silicon-based composite wet gel:
[0037] Dimethyldiethoxysilane (DDS), 3-aminopropyltriethoxysilane (APTES), C 12 h 25 SO 3 Na, urea, and deionized water were mixed in a mass ratio of 3:3:1:4:20, reacted at 40°C for 5 hours, and then transferred to a closed container for gel aging for 48 hours to obtain GO-free ammoniated elastic silicon-based hygroscopic glue.
[0038] (2) Wet gel solvent replacement and drying
[0039]The prepared wet gel was sequentially soaked in 30%, 60% and 100% tert-butanol solutions at room temperature for 24 hours each. The replaced polar wet gel was dried at -15°C for 48 hours by vacuum freeze-drying method to obtain elastic silicon-based airgel; it was designated as SA airgel sample.
Embodiment 2
[0040] Example 2: Preparation of GO ammoniated elastic silicon-based airgel samples
[0041] Include the following steps:
[0042] (1) Preparation of GO ammoniated elastic silicon-based composite wet gel:
[0043] Prepare a 5 mg / ml GO dispersion by ultrasonic dispersion, mix it with dimethyldiethoxysilane (DDS), 3-aminopropyltriethoxysilane (APTES), C 12 h 25 SO 3 Na, urea, and deionized water were mixed in a mass ratio of 1:120:120:40:160:800, reacted at 40°C for 5 hours, and transferred the above mixed solution to a closed container for gel aging to obtain GO-containing ammoniated Elastic silicone based complex wet gel.
[0044] (2) Wet gel solvent replacement and drying
[0045] The prepared wet gel was sequentially soaked in 30%, 60% and 100% tert-butanol solutions at room temperature for 24 hours each. The replaced polar wet gel was dried at -15°C for 48 hours by vacuum freeze-drying method to obtain an elastic silicon-based airgel; it was recorded as the SGA airgel...
Embodiment 3
[0046] Example 3: Preparation of GO-free ammoniated elastic silicon-based airgel samples
[0047] Include the following steps:
[0048] (1) Preparation of GO-free ammoniated elastic silicon-based composite wet gel:
[0049] Dimethyldiethoxysilane (DDS), 3-aminopropyltriethoxysilane (APTES), C 12 h 25 SO 3 Na, urea, and deionized water are mixed in a certain ratio (3:3:1:4:20), reacted at about 45°C for 5 hours, and then transferred to a closed container for gel aging for 36 hours to obtain GO-free ammoniated elastic silicon base wet gel;
[0050] (2) Wet gel solvent replacement and drying
[0051] The prepared wet gel was sequentially soaked in 30%, 60% and 100% tert-butanol solutions at room temperature for 24 hours each. The replaced polar wet gel was dried at -25°C for 24 hours by vacuum freeze-drying method to obtain an elastic silicon-based airgel; it was designated as the SA airgel sample.
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