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Composite food packaging material and preparation method thereof

A packaging material and composite food technology, applied in the field of composite food packaging materials and their preparation, can solve the problems of high brittleness, poor moisture resistance, low mechanical strength of chitosan, etc., and achieve the effect of strong plasticity and reducing environmental pollution.

Inactive Publication Date: 2017-12-15
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, due to factors such as low mechanical strength, high brittleness, and poor moisture resistance of chitosan, its use and promotion are limited. Therefore, it needs to be modified to improve its mechanical properties, oxygen barrier and moisture resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] A composite food packaging material and a preparation method thereof, comprising the following steps:

[0021] (1) Preparation of Acetobacter xylinum medium (g / L): glucose 10, peptone 10, yeast powder 7.5, Na 2 HPO 4 10, pH 6.0, pasteurized.

[0022] (2) First activate Gluconoacetobacter xylinum, then inoculate the seed liquid into the culture medium according to the inoculation amount of 3% by volume, put it into a 30°C constant temperature incubator and cultivate it for 6 days, then take out the cellulose film and wash it with water After rinsing, the cellulose membrane was put into a pot and boiled for 15 minutes, and the operation was repeated until the pH was close to neutral to obtain a purified bacterial cellulose membrane.

[0023] (3) Place the bacterial cellulose membrane obtained after culturing for six days in distilled water, and add 0.01 mol and 0.02 mol of cationic etherification agent dropwise into the distilled water respectively at 60° C., and then ...

Embodiment 1

[0028] (1) Preparation of Acetobacter xylinum medium (g / L): glucose 10, peptone 10, yeast powder 7.5, Na 2 HPO 4 10, pH 6.0, pasteurized.

[0029] (2) First activate Gluconoacetobacter xylinum, then inoculate the seed liquid into the culture medium according to the inoculation amount of 3% by volume, put it into a 30°C constant temperature incubator and cultivate it for 6 days, then take out the cellulose film and wash it with water After rinsing, the cellulose membrane was put into a pot and boiled for 15 minutes, and the operation was repeated until the pH was close to neutral to obtain a purified bacterial cellulose membrane.

[0030] (3) The bacterial cellulose membrane obtained by culturing for six days was placed in distilled water. At 60° C., 0.01 mol of cationic etherification agent was added dropwise to the distilled water, and then reacted for 12 hours.

[0031] (4) dissolving chitosan in acetic acid solution to form a chitosan acetic acid solution with a concentr...

Embodiment 2

[0035] (1) Preparation of Acetobacter xylinum medium (g / L): glucose 10, peptone 10, yeast powder 7.5, Na 2 HPO 4 10, pH 6.0, pasteurized.

[0036] (2) First activate Gluconoacetobacter xylinum, then inoculate the seed liquid into the culture medium according to the inoculation amount of 3% by volume, put it into a 30°C constant temperature incubator and cultivate it for 6 days, then take out the cellulose film and wash it with water After rinsing, the cellulose membrane was put into a pot and boiled for 15 minutes, and the operation was repeated until the pH was close to neutral to obtain a purified bacterial cellulose membrane.

[0037] (3) The bacterial cellulose membrane obtained by culturing for six days was placed in distilled water. At 60° C., 0.01 mol of cationic etherification agent was added dropwise to the distilled water, and then reacted for 12 hours.

[0038] (4) dissolving chitosan in acetic acid solution to form a chitosan acetic acid solution with a concentr...

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Abstract

The invention discloses a composite food packaging material and a preparation method thereof, and belongs to the technical field of composite materials. The method comprises the steps that 1, bacterial cellulose is produced by fermentation of acetobactor xylinum; 2, bacterial cellulose membrane is obtained, and purification process is conducted, then 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride is used as an etherifying agent, and cationization is conducted on the cellulose membrane; 3, the cationic bacterial cellulose membrane and chitosan are subjected to crosslinking and blending reaction and then removed to be pressurized and dried, and a chitosan-bacterial cellulose composite material is prepared. The prepared composite material has good biocompatibility, biodegradability, membrane forming property, air permeability, good water retention, high mechanical strength and certain bacteriostatic action, and has good application prospect in the field of food packaging.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a composite food packaging material and a preparation method thereof Background technique [0002] With the continuous improvement of national living standards, disposable plastic foam lunch boxes, handbags, and fresh-keeping bags are more and more favored by people because of their convenient use and low price. The resin raw materials used in traditional plastic products are mainly derived from non-renewable petroleum resources. Due to their good chemical stability, they are difficult to degrade in the soil after being discarded, resulting in serious "white pollution". Therefore, biodegradable and renewable natural biopolymer materials have attracted the attention of many scholars. Such materials can be decomposed by microorganisms in soil to generate carbon dioxide, water and small inorganic molecules, which are truly environmentally friendly materials. For some fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08L1/28
CPCC08J7/12C08J2301/28C08J2405/08
Inventor 钟成孙忠岩贾士儒侯颖韩培培
Owner TIANJIN UNIV OF SCI & TECH
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