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Preparation method of single side oxidized cellulose film

A cellulose film and single-sided oxidation technology, which is applied in the field of preparation of single-sided oxidized cellulose film, can solve the problems of cellulose film waste and application restrictions, and achieve the effects of high reaction efficiency, simple operation, and low dosage

Inactive Publication Date: 2016-02-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the choice of oxidation method and oxidation process, the oxidation of cellulose membranes is often double-sided, which limits the application of cellulose membrane oxidation functional membranes in some fields, such as the adsorption of metal particles by double-sided oxidized cellulose membranes. Conductive film cannot meet the single-sided conduction required in some special occasions; and when oxidized cellulose film absorbs antibacterial particles and other wound dressings in the medical field, double-sided oxidized cellulose film will cause unnecessary waste

Method used

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  • Preparation method of single side oxidized cellulose film

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Preparation of cellulose film: disperse the cotton linters in the alkaline solution, freeze the resulting cellulose suspension at low temperature, take it out after 24 hours, stir it with high-speed machinery, and centrifuge. The cellulose solution obtained by this simple method is placed in a glass Push the plate to make a thin layer, then immerse in concentrated sulfuric acid solution to solidify and regenerate to obtain a transparent cellulose film, and the cellulose film is washed repeatedly with deionized water before use.

[0022] (2) Buffer solution configuration: 3.3-3.6g of boric acid is dissolved in 800ml of water, diluted with 0.1mol / L sodium hydroxide solution, so that the pH of the solution is 10-11

[0023] (3) Impregnation of cellulose membrane: Dissolve 2 g of sodium bromide and 0.3 g of TEMPO reagent in the buffer solution configured in (2) above, and after mixing evenly with magnetic stirring, immerse the cellulose membrane in the configured solutio...

Embodiment 2

[0028] (1) Preparation of cellulose film: at room temperature, immerse bacterial cellulose dried to absolute dryness in 100 mL ethylenediamine solution for 90 min, then wash with a large amount of distilled water and methanol, and dry in vacuum at 80 °C. Add 100mL of DMAc and 8g of LiCl dried in vacuum at 150°C into a 250mL three-neck round bottom flask, then stir, and heat the three-neck flask with an oil bath. After the LiCl was completely dissolved, the bacterial cellulose impregnated with ethylenediamine was added, heated and stirred for 3 hours, cooled to room temperature and left to stand until it was completely dissolved. The above bacterial cellulose solution was scraped on a constant temperature hot glass plate to form a film, immersed in a coagulation bath at 25°C, and then dried naturally.

[0029] (2) Buffer solution configuration: 3.3-3.6g of boric acid is dissolved in 800ml of water, diluted with 0.1mol / L sodium hydroxide solution, so that the pH of the solution ...

Embodiment 3

[0035] (1) Preparation of cellulose film: Dilute the nanocellulose suspension obtained by acid hydrolysis to 0.5 wt%, and treat it with 300W ultrasonic power for 10 minutes in an ice bath to ensure that the nanocellulose is uniformly dispersed in water. Then filter the above-mentioned diluted solution with a glass membrane-changing filter device covered with an organic filter membrane, and vacuum filter with a vacuum pump. After the nanocellulose is uniformly formed into a nanocellulose membrane, take it out together with the organic filter membrane, cover with an organic filter membrane, dry at room temperature for 2 to 3 days, and then move to a vacuum oven at 60°C to dry for 2 to 3 days. sky. After drying, it is uncovered to obtain a transparent nanocellulose film.

[0036] (2) Buffer solution configuration: 3.3-3.6g boric acid is dissolved in 800ml water, diluted with 0.1mol / L potassium hydroxide solution, so that the pH of the solution is 10-11.

[0037] (3) Impregnatio...

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Abstract

The invention relates to a preparation method of a single side oxidized cellulose film. The preparation method is characterized by firstly preparing a porous cellulose film by adopting a phase transformation method, soaking the prepared cellulose film in a TEMPO / NaBr mixed solution with a certain pH (10-11), after carrying out treatment for 3-8 hours, immobilizing the cellulose film in molds in different thickness, preparing printing pulp with different NaClO contents to carry out printing treatment on one side of the cellulose film and carrying out washing treatment after reacting for a certain time, thus obtaining the single side oxidized cellulose film. The preparation method has the beneficial effects that the method is simple to operate, is mild in reaction conditions and high in reaction efficiency and is suitable for industrial production; obtainment of the single side oxidized cellulose functional film provides more possibility for functionalization application of the oxidized cellulose film; after being further processed, the single side oxidized cellulose film can be used in the fields of single side electric conduction, medical treatment, barrier films, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of a cellulose film, in particular to a method for preparing a single-sided oxidized cellulose film Background technique [0002] Cellulose membrane has a series of excellent properties, such as highly hydrophilic, excellent permeability, pollution resistance, good physical and chemical resistance, high temperature resistance, high transparency and good physical and mechanical properties; Environmentally friendly and renewable; cellulose membranes have been widely used in osmosis technology, food processing, and medical applications in recent years. [0003] The hydroxyl group on the cellulose macromolecular chain and the porous structure of the cellulose membrane make it possible to improve the shortcomings of the cellulose membrane such as poor water resistance and chemical corrosion resistance through chemical modification and loading technologies, and to further increase the added value of...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08L1/02
Inventor 王玮白倩刘晓亚
Owner JIANGNAN UNIV
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