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Nano cellulose and preparation method thereof

A technology of nanocellulose and cellulose, applied in the field of materials, can solve the problems of intractable hydrolysis products, strong corrosiveness of reaction equipment, and difficult recycling of reaction liquids.

Active Publication Date: 2020-10-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the inorganic acid system, cellulose has a serious hydrolysis problem, the recovery rate is low, and the inorganic acid is highly corrosive to the reaction equipment, the hydrolyzate is difficult to handle and the reaction solution is difficult to recycle.

Method used

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  • Nano cellulose and preparation method thereof
  • Nano cellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh the cellulose pulp of 0.5g pine wood and add in the reaction kettle, add formic acid and water simultaneously, the total volume of formic acid and water is 9.6ml, wherein contains 0.5g formic acid and 9.5g water, stirs and makes it fully mix. Seal the reaction kettle, close the gas inlet and outlet, heat up to 180°C by electric heating under 600rpm magnetic stirring, and react for 600min. After the reaction, the reactor was cooled to room temperature with ice water, the stirring was stopped, and the reaction solution was centrifuged to obtain the solid nanocellulose part and the recovered reaction solution, and the solid was washed 3 times with deionized water until neutral. The nanocellulose product is obtained by drying the nanocellulose solid at 30° C. for 36 hours in a vacuum box with a vacuum degree of -0.1 MPa. The recovered reaction solution can be further recycled to prepare nanocellulose.

[0038] The nanocellulose labeled as #1 sample was obtained with ...

Embodiment 2

[0050] Weigh 1g of pine wood cellulose pulp into the reactor, add acetic acid and water at the same time, the total volume of acetic acid and water is 21.0ml, which contains 1.5g acetic acid and 20.1g water, stir to make it fully mixed. Seal the reaction kettle, close the air inlet and outlet, and raise the temperature to 160°C by electric heating under 800rpm magnetic stirring, and react for 1000min. After the reaction, the reactor was cooled to room temperature with ice water, the stirring was stopped, and the reaction solution was centrifuged to obtain the solid nanocellulose part and the recovered reaction solution, and the solid was washed 5 times with deionized water until neutral. The nanocellulose product is obtained by drying the nanocellulose solid at -20° C. for 12 hours in a freeze-drying oven with a vacuum degree of -0.1 MPa. The recovered reaction solution can be further recycled to prepare nanocellulose.

[0051] It was obtained that the yield of nanocellulose ...

Embodiment 3

[0053] Weigh the cellulose pulp of 0.6g pine and add in the reaction kettle, add propionic acid and water simultaneously, the total volume of propionic acid and water is 10.4ml, wherein contains 0.8g propionic acid and 10.0g water, stirs and makes it fully mix. Seal the reaction kettle, close the air inlet and outlet, heat up to 150°C by electric heating under 800rpm magnetic stirring, and react for 800min. After the reaction, the reactor was cooled to room temperature with ice water, the stirring was stopped, and the reaction liquid was centrifuged to obtain the solid nanocellulose part and the recovered reaction liquid, and the solid was washed 4 times with deionized water until neutral. The nanocellulose product is obtained by drying the nanocellulose solid at -20° C. for 12 hours in a freeze-drying oven with a vacuum degree of -0.1 MPa. The recovered reaction solution can be further recycled to prepare nanocellulose.

[0054] The yield of nanocellulose was 89.7%, and the ...

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PUM

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Abstract

The invention discloses a nano cellulose and a preparation method thereof. The water contact angle of the nano cellulose is smaller than 20 degrees. The method prepares the nano cellulose in an organic acid system, and at least comprises the following steps: (1) reacting a cellulose raw material with an organic acid solvent and water to obtain a solid reactant, and washing the solid reactant to beneutral; and (2) drying the obtained solid reactant to obtain the nano cellulose. According to the method, the organic acid is adopted to hydrolyze the cellulose to prepare the nano cellulose, the operation is simple, the reaction conditions are mild, the energy consumption is low, the separated and recycled reaction solution can be recycled, the environmental pollution is reduced, and a new pathfor industrial production of the nano cellulose is provided.

Description

technical field [0001] The application relates to a nanocellulose and a preparation method thereof, belonging to the field of materials. Background technique [0002] As the most abundant renewable biomass resource on earth, cellulose accounts for about 40-50% of the total mass of biomass. It is composed of β-D-glucopyranose groups connected by β-1,4-glycosidic bonds The linear natural polymer compound, the polymer compound further forms cellulose bundles through covalent bonds and hydrogen bonds, which are mainly composed of crystalline regions and amorphous regions. Compared with synthetic polymers, cellulose has the advantages of extensive sources, environmental friendliness, biocompatibility, biodegradability and regeneration. Nanocellulose is a new type of biomass nanomaterial with nanometer size and high specific surface area. It not only has the excellent properties of cellulose itself, but also has high purity, high crystallinity, high modulus, high strength, ultraf...

Claims

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Application Information

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IPC IPC(8): C08B15/02A61K8/02A61K8/73A61Q19/00
CPCA61K8/0212A61K8/731A61Q19/00C08B15/02
Inventor 路芳司晓勤卢锐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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