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Method for forming nano cellulose film

A nanocellulose and cellulose technology, applied in pharmaceutical formulations, preparations for skin care, cosmetics, etc., can solve problems such as environmental pollution, cellulose degradation, decrease in degree of polymerization and crystallinity, etc.

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

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Problems solved by technology

In addition, the chemical modification of cellulose will also cause problems such as degradation, denaturation, decrease in the degree of polymerization and crystallinity of cellulose, deterioration of mechanical strength, and weakening of acid and alkali resistance. At the same time, there are serious environmental pollution problems in the production process.

Method used

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  • Method for forming nano cellulose film
  • Method for forming nano cellulose film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Grind the nanocellulose of corn stalks, weigh 0.6g of crushed 40-mesh nanocellulose of corn stalks and add it to 25mL of water, imbibition for 5h, separate the solid by suction filtration, then disperse the cellulose raw material with 20mL of acetone, and separate by suction filtration Solids are used to replace the water therein, and acetone needs to be repeatedly replaced and suction filtered twice. Further, the above-mentioned separated solid was added to 10 mL of N,N-dimethylformamide (DMF), stirred for 5 h until the cellulose was fully dispersed to obtain a cellulose solution, and left to stand for 20 h for aging to obtain a casting solution of cellulose. Place the above-prepared casting solution on a smooth and clean glass plate, scrape a film with a thickness of 0.02 cm on the clean glass plate with a scraper, and then put the glass plate into water together with the film to obtain nanocellulose Membrane, labeled #1 Nanocellulose Membrane.

[0030] #1 Characte...

Embodiment 2

[0033] Grind the nanocellulose of corn stalks, weigh 1.9g of the crushed 100-mesh nanocellulose of corn stalks and add it to 55mL of water, imbibition for 2h, separate the solid by suction filtration, then disperse the cellulose raw material with 50mL of acetone, and separate by suction filtration Solids are used to replace the water therein, and acetone needs to be repeatedly replaced and suction filtered 3 times. Further, the above-mentioned separated solid was added to 33 mL of tetrahydrofuran (THF), stirred for 12 h until the cellulose was fully dispersed to obtain a cellulose solution, left to stand for 20 h for aging to obtain a cellulose casting solution, and the above prepared casting solution flow Put it on a smooth and clean glass plate, scrape a film with a thickness of 0.01cm on the clean glass plate with a scraper, and then put the glass plate together with the film into water to obtain a nanocellulose film.

Embodiment 3

[0035] Grind the nanocellulose of corn stalks, weigh 0.5g of crushed 40-mesh nanocellulose of corn stalks, add it to 15mL of water, imbibe for 2h, separate the solid by suction filtration, then disperse the cellulose raw material with 10mL of methanol, and separate by suction filtration Solids are used to replace the water therein, and methanol needs to be repeatedly replaced and suction filtered 3 times. Further, add the above-mentioned separated solid into a mixed system containing 0.8g lithium chloride (LiCl) and 10mL N,N-dimethylacetamide (DMAC), stir for 12h until the cellulose is fully dispersed to obtain a cellulose solution, and let stand for 10h to proceed Aging to obtain the casting solution of cellulose, place the above-mentioned casting solution flow on a smooth and clean glass plate, scrape a film with a thickness of 0.01cm on the clean glass plate with a scraper, and then connect the glass plates The membranes are put into water together to obtain the nanocellulo...

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Abstract

The invention discloses a method for forming a nano cellulose film , which at least comprises the following steps: (1) after a cellulose raw material absorbs water and swells, mixing the cellulose rawmaterial with an organic solvent 1, then separating to obtain a solid, and replacing water in cellulose by the organic solvent 1; (2) mixing the separated solid with an organic solvent 2, aging to obtain a membrane casting solution, and uniformly dispersing cellulose by the organic solvent 2; and (3) scraping the membrane casting solution on a glass plate to form a membrane, thereby obtaining thenano cellulose film. The prepared nano cellulose film has good hydrophilicity and mechanical properties, is simple in operation process, and has a wide application prospect in the industries of cosmetics, medicines, foods, and the like.

Description

technical field [0001] The application relates to a method for forming a nanocellulose film, which belongs to the technical field of polymer film preparation. Background technique [0002] Plant cellulose is the most abundant renewable resource on earth, accounting for about 40-50% of the total mass of biomass. As a material with a wide range of sources, environmental friendliness, biocompatibility and biodegradability, making full use of cellulose can not only It is of great practical significance to protect the environment and save limited oil resources. From the chemical structure point of view, cellulose is a chain polymer compound composed of D-glucose connected by glycosidic bonds, and each glucosyl ring contains 3 hydroxyl groups, which has good hydrophilicity, but due to the polymer chain There are strong intramolecular and intermolecular hydrogen bonds between them, making them difficult to dissolve and melt, and their stable physical and chemical properties at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18A61K8/02A61K8/73A61Q19/00C08L1/02
CPCA61K8/0212A61K8/731A61Q19/00C08J5/18C08J2301/02
Inventor 路芳司晓勤卢锐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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