Block aerogel composite material and preparation method thereof

[0087] In the preparation of the organosol, those skilled in the art can select or adjust the ratio of each component according to the actual situation, so as to obtain the desired organosol.

[0088] According to an embodiment of the present invention, the organic sol precursor used is resorcinol and formaldehyde, the alkaline catalyst is sodium carbonate, and the molar ratio of resorcinol:formaldehyde:water:sodium carbonate may be 1:1.5 ~2.5: 50 to 1500: 0.001 to 0.1, preferably 1: 1.8 to 2.2: 50 to 1000: 0.002 to 0.1, preferably 1: 1.8 to 2.0: 150 to 500: 0.005 to 0.05.

[0089] When the sol is a metal oxide sol, the specific operation steps may include: uniformly mixing the precursor of the metal oxide sol with alcohol and water, then adding an acid catalyst and stirring to obtain the metal oxide sol.

[0090] It should be understood that the materials used in the preparation process of the metal oxide sol are not particularly limited. The organic sol precursors include butyl titana

[0112] Example 1

[0113] The pre-cultured seed culture of Acetobacter xylinum was inoculated into 12L of Acetobacter xylinum fermentation culture at an inoculum of 10%, shaken sufficiently, and placed in a constant temperature of 30℃ for 15 days to obtain a cellulose hydrogel. . The fermentation broth of Acetobacter xylinum contains 2% glucose, 0.5% peptone, 0.5% yeast powder, 0.27% disodium hydrogen phosphate pentahydrate, 0.115% citric acid-water compound, pH 6.0, and high temperature sterilization for 20 minutes.

[0114] The cellulose hydrogel fermented by microorganisms was placed in a 5% NaOH aqueous solution at 90°C for 10 hours, and then placed in deionized water at 85°C for 15 hours. During this period, the deionized water was replaced 3 times, and the volume ratio was 1: The mixture of 1 tert-butanol and deionized water is solvent replaced at 60°C for 10 hours, during which the mixture is replaced twice, and the sample is freeze-dried until the sample is completely dry to

[0118] Example 2

[0119] The pre-cultured seed culture of Acetobacter xylinum was inoculated into 10L of the fermentation culture of Acetobacter xylinum at an inoculum of 12%, shaken sufficiently, and placed in a constant temperature of 30℃ for 20 days to obtain a cellulose hydrogel. . The fermentation broth of Acetobacter xylinum contains glucose 4%, peptone 0.8%, yeast powder 0.5%, disodium hydrogen phosphate pentahydrate 0.35%, citric acid-water compound 0.115%, pH 6.2, and high temperature sterilization for 20 minutes.

[0120] The cellulose hydrogel fermented by microorganisms was placed in a 6% NaOH aqueous solution at 90°C for 8 hours, and then placed in deionized water at 85°C for 15 hours. The deionized water was replaced 3 times during the period, and the volume ratio was 1: The mixture of 1 tert-butanol and deionized water is subjected to solvent replacement at 58°C for 10 hours, during which the mixture is replaced twice, and the sample is freeze-dried until the sample i