A kind of chestnut shell airgel and its preparation method and application
A technology of chestnut shell and aerogel
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Embodiment 1
[0031] (1) 1 kg of chestnut shells, add 8% dilute nitric acid by volume and react at 90°C for 1 h, the solid-liquid ratio is 1:10 (g / mL), filter, wash with water until neutral, and add 4% by mass to the obtained filter residue. 10L of NaOH aqueous solution and 10L of 8% hydrogen peroxide aqueous solution, react at 60°C for 3h, filter, wash with water until neutral, and dry at 50°C for 8h to obtain chestnut shell cellulose;
[0032] (2) Chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride in a mass ratio of 1:15, swell at 120 ° C for 2 hours, add a sulfuric acid solution with a volume fraction of 10% of the ionic liquid mass, React at 90°C for 3h, centrifuge at 5000r / min for 10min, dialyze it in distilled water for 24h (molecular weight cut-off 3000Da) to obtain a nanocellulose suspension; fully mix it with 15% lauric acid ethanol solution with a mass fraction of 1 times its volume, Then add hydrogen peroxide with a mixed liquid fraction of 0.8% as an initiator, r...
Embodiment 2
[0038] (1) 1 kg of chestnut shells, add 12% dilute nitric acid by volume and react at 70°C for 3 hours, with a solid-liquid ratio of 1:30 (g / mL), filter, wash with water until neutral, and add 6% mass fraction of filtrate to the obtained filter residue. 30 L of NaOH aqueous solution and 30 L of 10% hydrogen peroxide aqueous solution, react at 60 °C for 2 h, filter, wash with water until neutral, and dry at 60 °C for 3 h to obtain chestnut shell cellulose;
[0039] (2) The mass ratio of chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride is 1:20, swelling at 120 °C for 2 h, adding 3 times the mass of ionic liquid with a volume fraction of 10% sulfuric acid solution. React at 90°C for 3h, centrifuge at 10000r / min for 10min, dialyze in distilled water for 48h (molecular weight cut-off 5000Da) to obtain a nanocellulose suspension; fully mix it with 30% lauric acid ethanol solution of 3 times its volume, and then Add 1.5% hydrogen peroxide in the mixed liquid as an i...
Embodiment 3
[0045] (1) 1kg of chestnut shells, add 10% dilute nitric acid by volume and react at 80°C for 2h, the solid-liquid ratio is 1:20 (g / mL), filter, wash with water until neutral, and add 5% by mass to the obtained filter residue 20 L of NaOH aqueous solution and 20 L of 9% aqueous hydrogen peroxide solution, react at 50 °C for 2.5 h, filter, wash with water until neutral, and dry at 55 °C for 5 h to obtain chestnut shell cellulose;
[0046] (2) The mass ratio of chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride is 1:18, swelling at 110°C for 2.5h, adding 9% sulfuric acid solution with twice the mass of ionic liquid, React at 80°C for 4h, centrifuge at 8000r / min for 20min, dialyze it in distilled water for 36h (molecular weight cut-off 4000Da) to obtain a nanocellulose suspension; fully mix it with 20% 20% lauric acid ethanol solution with twice its volume, Then add hydrogen peroxide with a fraction of 1.0% of the mixed liquid as an initiator, react at 50 °C for 1...
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