Preparation method of nano-cellulose
A nano-cellulose and cellulose technology, applied in the field of nano-materials, can solve the problems of difficult hydrolysis acid solution, complicated post-treatment process, and difficult treatment of reaction acid solution, so as to speed up the oxidation reaction speed, improve the oxidation reaction efficiency, and react The effect of increased accessibility
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Embodiment 1
[0023] Embodiment 1 of the present invention: the preparation of nanocellulose:
[0024] (1) Pretreatment: At room temperature, soak 5 grams of microcrystalline cellulose with 50 grams of 7% sodium hydroxide aqueous solution for 10 hours, filter out the cellulose and wash it with deionized water until the pH of the filtrate The value is 8.
[0025] (2) Oxidation reaction: Disperse the filtered cellulose in 100mL deionized water, add 0.5g sodium bromide and 0.05g 2,2,6,6-tetramethylpiperidine-1-oxide, and stir until After dissolving, add 20g of sodium hypochlorite solution with a mass concentration of 5%, turn on the ultrasonic oscillation, the ultrasonic power is 300w, the frequency is 20kHz, adjust the pH of the reaction solution with 0.5mol / L sodium hydroxide aqueous solution, and maintain the pH value of the reaction solution at 10 -11 or so.
[0026] (3) Post-treatment: When the pH value does not change significantly (the reaction lasts 150 minutes), the reaction solutio...
Embodiment 2
[0027] Embodiment 2 of the present invention: the preparation of nanocellulose:
[0028] Disperse 5 grams of microcrystalline cellulose in 30 grams of 9% sodium hydroxide aqueous solution, soak at room temperature for 15 hours, filter out the cellulose and wash it with deionized water until the pH of the filtrate is 7. Disperse the filtered cellulose in 200mL deionized water, add 0.75g sodium bromide and 0.1g 2,2,6,6-tetramethylpiperidine-1-oxide, stir until dissolved, then add 25g mass For sodium hypochlorite solution with a concentration of 5%, turn on the ultrasonic oscillation, the ultrasonic power is 500w, the frequency is 30kHz, and the pH of the reaction solution is adjusted with 0.5mol / L sodium hydroxide aqueous solution, so that the pH value of the reaction solution is maintained at about 10-11. When the reaction did not change significantly in the pH value (the reaction lasted 85 minutes), the reaction solution was centrifuged four times at a speed of 10,000 rpm to r...
Embodiment 3
[0029] Embodiment 3 of the present invention: the preparation of nanocellulose:
[0030] Disperse 5 grams of microcrystalline cellulose in 80 grams of 4% potassium hydroxide aqueous solution, soak at room temperature for 20 hours, filter out the cellulose and wash it with deionized water until the pH of the filtrate is 6. Disperse the filtered cellulose in 300mL deionized water, add 0.7g sodium bromide and 0.03g 2,2,6,6-tetramethylpiperidine-1-oxide, stir until dissolved, then add 15g mass For sodium hypochlorite solution with a concentration of 5%, turn on the ultrasonic oscillation, the ultrasonic power is 400w, the frequency is 40kHz, and the pH of the reaction solution is adjusted with 0.5mol / L sodium hydroxide aqueous solution, so that the pH value of the reaction solution is maintained at around 10-11. When the pH value remained unchanged after the reaction (the reaction lasted 115 minutes), the reaction solution was centrifuged twice at a speed of 15,000 rpm to remove l...
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