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Preparation method of biodegradable cellulose acetate film

A cellulose acetate membrane and a biodegradable technology are applied in the field of preparation of biodegradable cellulose acetate membranes, and can solve problems such as difficult disposal of waste alkali

Inactive Publication Date: 2007-02-14
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it also overcomes the problem of environmental pollution such as the difficulty in handling the swollen spent alkali.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Take 1.00g of ramie cellulose and swell with distilled water at 15°C for 0.5 hours, then swell with glacial acetic acid at this temperature for 0.5 hours, put the swollen ramie cellulose into the reactor, add 6ml of acetic anhydride, heat up to 80 ℃, add 0.2 ml of sulfuric acid dropwise, and react for 30 minutes to obtain a yellow sol of cellulose acetate. Dissolve cellulose acetate yellow sol in 20ml acetone at 20°C, add polyethylene glycol to prepare a casting solution. Take 2ml of casting solution and cast it into a mold to form a film, volatilize the acetone at 0°C, put the mold into 0°C water to separate the film from the mold, recover and dry the film.

Embodiment 2

[0009] Take 1.00g of ramie cellulose and swell with distilled water at 30°C for 0.5 hours, then swell with glacial acetic acid for 0.5 hours at this temperature, put the swollen ramie cellulose into the reactor, add 6ml of acetic anhydride, heat up to 80 ℃, add 0.2 ml of sulfuric acid dropwise, and react for 30 minutes to obtain a yellow sol of cellulose acetate. Dissolve cellulose acetate yellow sol in 30ml acetone at 20°C, add tributyl citrate to prepare a casting solution. Take 4ml of casting solution and cast it into a mold to form a film, volatilize the acetone at 20°C, put the mold into 0°C water to separate the film from the mold, recover and dry the film.

Embodiment 3

[0011] Take 1.00g of ramie cellulose and swell with distilled water at 15°C for 0.5 hours, then swell with glacial acetic acid at this temperature for 0.5 hours, put the swollen ramie cellulose into the reactor, add 6ml of acetic anhydride, heat up to 80 ℃, add 0.2 ml of sulfuric acid dropwise, and react for 30 minutes to obtain a yellow sol of cellulose acetate. Dissolve cellulose acetate yellow sol in 20ml acetone at 20°C, add polyvinyl alcohol to prepare a casting solution. Take 2ml of casting solution and cast it into a mold to form a film, volatilize the acetone at 25°C, put the mold into 25°C water to separate the film from the mold, recover and dry the film.

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Abstract

The present invention relates to preparation process of biodegradable cellulose acetate film. Ramie cellulose is swelled first with water and then with glacial acetic acid, and reacted with acetic anhydride under catalysis of sulfuric acid to obtain yellow cellulose acetate gel. The obtained cellulose acetate gel is dissolved in acetone, and the solution is filtered and added with different kinds of plasticizer to compound film casting liquid. The film casting liquid is cast in mold to form cellulose acetate film of certain thickness, and after volatilizing the solvent, the cellulose acetate film is separated from the mold in a water bath. The biodegradable cellulose acetate film may be used in preserving soil moisture and may be biodegraded without destroying soil structure and polluting environment.

Description

1. Technical field [0001] The invention relates to a method for preparing a biodegradable cellulose acetate film by using biomass cellulose as a raw material, and the method is particularly suitable for preparing the cellulose acetate film by using ramie cellulose as a raw material. 2. Technical Background [0002] At present, most of the mulch films used in domestic and foreign agricultural production are plastic mulch films. The production method is to melt polyvinyl chloride and other raw materials with hot-melt equipment, add various modified additives, and then blow or stretch them to make a certain thickness. The film is covered on the ground surface with a film applicator or manually to achieve the purpose of water retention and moisturizing. This product and technology has the problem that plastics are difficult to degrade and form a large amount of "white pollution"; in the production process, its melting equipment requires a lot of electricity, resulting in energy ...

Claims

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Application Information

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IPC IPC(8): C08L1/12C08J5/18
Inventor 刘昭铁樊岫珊
Owner SHAANXI NORMAL UNIV
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