Nanocellulose and preparation method thereof
A nano-cellulose, extraction technology, applied in the field of nano, to achieve the effect of good dispersion, low cost, and simple process
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[0015] A method for preparing nanocellulose, comprising:
[0016] The agricultural and forestry wastes with a particle size of 3-5 mm were selected as raw materials for preparing nanocellulose. Agricultural and forestry wastes include crop stalks, sawdust and wood chips, forestry harvesting residues and fibers. Specifically, examples include cotton, wood, bamboo, straw, wood pulp, straw pulp, bamboo pulp, wood fiber, bamboo fiber, and microcrystalline cellulose. The various raw materials above are vegetable raw materials rich in cellulose, lignin and hemicellulose, and have a good raw material base.
[0017] Preferably, the above-mentioned agricultural and forestry waste without impurities is selected as the raw material for preparing nanocellulose. It can also be understood that the above-mentioned agricultural and forestry wastes are selected and sorted to remove impurities. Sorting and removing impurities is to remove waste metals, waste plastics, waste glass, waste batt...
Embodiment 1
[0053] Agricultural and forestry wastes such as rice straw, wheat straw, corn stalk, corn cob and bean stalk are selected as raw materials for preparing nanocellulose. After removing waste metals, waste plastics, waste glass, waste batteries, ceramic stones and other sundries in the above agricultural and forestry wastes, put them into a wet material grinder and grind them into 5mm particles. The pulverized agricultural and forestry waste is mixed with water at a mass ratio of 1:8, then added to a colloid mill, and the pulverized agricultural and forestry waste is ground to 20 μm particles to obtain a slurry.
[0054] The prepared slurry was put into a plastic reaction tank, and 1% of the slurry mass of potassium hydroxide and 0.5% of the slurry mass of potassium persulfate were added thereinto, and the stirring was continued for 60 minutes to ensure that it was fully hydrolyzed.
[0055] Inoculate the hydrolyzed slurry with 0.5% of the slurry mass of lactic acid bacteria, bac...
Embodiment 2
[0061] Agricultural and forestry wastes such as rice straw, wheat straw, corn stalk and sawdust are selected as raw materials for preparing nanocellulose. After removing waste metals, waste plastics, waste glass, waste batteries, ceramic stones and other sundries in the above agricultural and forestry wastes, put them into a wet material grinder and grind them into 3mm particles. The pulverized agricultural and forestry waste is mixed with water at a mass ratio of 1:6, then added to a cone mill, and the pulverized agricultural and forestry waste is ground to a particle size of 25 μm to obtain a slurry.
[0062] Add the prepared slurry into a plastic reaction tank, and add potassium hydroxide with a mass of 1.5% of the slurry therein, and keep stirring for 35 minutes to ensure that it is fully hydrolyzed.
[0063] Inoculate the hydrolyzed slurry with 0.5% of the slurry mass of mixed strains of lactic acid bacteria, yeast, cellulase and dextranase, and culture at 35° C. for 11 h...
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