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Method for improving gas barrier property of film substrate, film and application

A gas barrier and film technology, applied in transportation and packaging, flexible coverings, packaging, etc., can solve problems such as poor interface interaction, shedding, and limitations in practical applications

Active Publication Date: 2022-07-29
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, poor interfacial interactions can easily cause GO or rGO layers to detach from substrates under external physical forces such as bending, stretching, and folding, limiting practical applications.

Method used

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  • Method for improving gas barrier property of film substrate, film and application
  • Method for improving gas barrier property of film substrate, film and application
  • Method for improving gas barrier property of film substrate, film and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Accurately weigh 12 g of cellulose acetate and 5 mL of glycerol and dissolve them in 95 mL of acetic acid solution, and stir thoroughly until they are completely dissolved. The cellulose acetate film was obtained by the casting method, and was naturally dried at room temperature to obtain a CA film with a film thickness of 100 μm.

[0025] 2) Soak 5 g of cellulose acetate film in 20 mL of a chitosan aqueous solution with a concentration of 3 wt.%, and keep it at 60° C. for 24 hours.

[0026] The film was taken out and rinsed with deionized water to remove unreacted molecular glue; then immersed in 20 mL of GO (1-2 nm thick) aqueous solution with a concentration of 1 mg / ml, and incubated at 60 °C for 24 h. The film was taken out, rinsed with deionized water to remove unfixed GO, and dried at room temperature to obtain the CA / GO film.

[0027] 3) Accurately weigh 0.18 g of cobalt acetate tetrahydrate and dissolve it in 10 mL of ethylene glycol, and slowly add 100 mg o...

Embodiment 2

[0030] 1) Accurately weigh 15 g of cellulose acetate and 5 mL of glycerol and dissolve in 95 mL of acetic acid solution, and stir well until all dissolved. The cellulose acetate film was obtained by the casting method, and was naturally dried at room temperature to obtain a CA film with a film thickness of 100 μm.

[0031] 2) Soak 4 g of cellulose acetate film in 20 mL of a polyvinyl alcohol aqueous solution with a concentration of 2 wt. %, and keep it at 90° C. for 12 hours. The film was taken out, rinsed with deionized water to remove unreacted molecular glue, and then immersed in 20 mL of an aqueous solution with a concentration of 2 mg / ml GO (1-2 nm in thickness), and incubated at 60 °C for 10 h. The film was taken out, rinsed with deionized water to remove unfixed GO, and dried at room temperature to obtain the CA / GO film.

[0032] 3) Accurately weigh 0.18g of nickel acetate tetrahydrate and dissolve it in 10mL of ethylene glycol, and slowly add 150mg of sodium borohydri...

Embodiment 3

[0035]1) Accurately weigh 6 g of cellulose acetate and 10 mL of glycerol and dissolve in 90 mL of acetic acid solution, and stir well until all dissolved. The cellulose acetate film was obtained by a casting method, and was naturally dried at room temperature to obtain a CA film with a film thickness of 90 μm.

[0036] 2) Soak 5 g of cellulose acetate film in 20 mL of a polyethyleneimine aqueous solution with a concentration of 2 wt.%, and keep it at 40° C. for 5 hours. The film was taken out, rinsed with deionized water to remove unreacted molecular glue, and then immersed in 20 mL of an aqueous solution with a concentration of 2 mg / ml GO (1-2 nm in thickness), and incubated at 50 °C for 6 h. The film was taken out, rinsed with deionized water to remove unfixed GO, and dried at room temperature to obtain the CA / GO film.

[0037] 3) Accurately weigh 0.18g of ferric acetate tetrahydrate and dissolve it in 10mL of ethylene glycol, and slowly add 300mg of sodium borohydride unde...

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Abstract

The invention discloses a method for improving the gas barrier property of a matrix, and belongs to the technical field of bioplastic packaging. According to the technical scheme, a certain mass fraction of cellulose acetate (CA) and a glycerol solution are prepared into a cellulose acetate film through a tape casting method, and the cellulose acetate film is combined with graphene oxide (GO) nanosheets under the action of molecular glue to form a compact composite film material (CA / GO); and then riveting transition metal oxide nanoparticles (NPs) prepared by adopting a room-temperature rapid reduction method on the surface of the CA / GO film under the action of hydrogen bonds to realize precise repair of GO defect sites and block a gas transmission channel, thereby obtaining the high-gas-barrier CA / GO-NPs nano composite film. The method is low in energy consumption, simple in technological process and easy for batch and large-area production, effectively reduces the permeability of oxygen and water vapor molecules, and is expected to be widely applied to the bioplastic-based packaging fields of food preservation, medicine packaging, electronic product packaging, agricultural packaging and the like.

Description

technical field [0001] The invention belongs to the technical field of bioplastic gas-resistant films, and in particular relates to a method for improving the gas barrier properties of a matrix. Background technique [0002] In recent years, with the promulgation of the "plastic ban" and people's increasing attention to environmental issues, natural materials as bioplastic packaging have attracted increasing attention due to their advantages such as biocompatibility, biodegradability, renewability and low cost. more and more attention. In particular, cellulose, the most abundant and renewable natural polysaccharide, can be efficiently isolated from various lignocellulosic biomass, including wood or agricultural residues. Furthermore, as one of the most promising derivatives of cellulose, cellulose acetate (CA) has been widely used in various daily consumer products such as cigarette filters, textiles, and packaging film materials. However, the high gas permeability of pure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L1/12C08L5/08C08L29/04C08L79/02C08K3/04C08K3/22B65D65/42
CPCC08J7/12C08J5/18B65D65/42C08J2301/12C08J2405/08C08J2429/04C08J2479/02C08K3/042C08K2003/2289C08K2003/2293C08K2003/2272C08K2201/011
Inventor 杜健周慧敏王海松鲁杰程意陶叶晗吕艳娜
Owner DALIAN POLYTECHNIC UNIVERSITY
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