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Fluorine-contained hydrophobic oil-proof modified nanocellulose for food packaging paper and preparation method of nanocellulose

A technology of nanocellulose and food wrapping paper, applied in the directions of wrapping paper, wrapping paper, packaging, etc., can solve the problems of harming food, reducing physical strength, hidden dangers, etc., to improve physical properties, improve oxygen barrier, good film formation sexual effect

Active Publication Date: 2020-02-18
浙江恒川新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether the surface of food packaging paper is waxed or coated is safe, which is also a concern of the government, the public and technical personnel in related fields. There will be certain safety hazards for the surface of food packaging paper coated with wax or coated; for example, waxed paper is used for packaging Hot water will melt the paraffin on the inner wall of the paper cup, which may endanger your health
In addition, this kind of wax and polymer film will cause trouble in the recycling process of waste paper, and the waste paper pulp is difficult to clean, thus affecting environmental sanitation and environmental safety.
[0006] 2. The strength and barrier of food packaging paper
[0007] Generally, when the ambient humidity of food packaging paper is high, water vapor can easily penetrate into the pores of the paper, and the paper has high water absorption, which will significantly reduce the physical strength of the paper, make the paper easy to break, and endanger its packaging. In addition, the ability of food packaging paper to block oxygen and water vapor is also weakened, so that the packaged food is easy to deteriorate, and it is difficult to meet the high requirements of food packaging.

Method used

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  • Fluorine-contained hydrophobic oil-proof modified nanocellulose for food packaging paper and preparation method of nanocellulose
  • Fluorine-contained hydrophobic oil-proof modified nanocellulose for food packaging paper and preparation method of nanocellulose
  • Fluorine-contained hydrophobic oil-proof modified nanocellulose for food packaging paper and preparation method of nanocellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for preparing a fluorine-containing hydrophobic and oil-resistant modified nanocellulose for food wrapping paper according to this embodiment, the method specifically includes the following steps:

[0034] (1) First, add water to the purchased nanocellulose (made by TEMPO oxidation-mechanical treatment of softwood pulp fibers) to prepare a 1.5% nanocellulose suspension, and put 1.5% nanocellulose in the reactor The aqueous suspension was evaporated so that the suspension became gel-like. Add dispersant N-N-dimethylformamide and gelatinous nanocellulose into another reactor according to the ratio, mix well, then keep stirring at constant temperature in the reactor for 6 hours at 85°C, then add trifluoroacetic acid anhydride and 4-dimethylaminopyridine (the mass ratio of nanocellulose, trifluoroacetic anhydride, and 4-dimethylaminopyridine is 1:50:2.0), then disperse for 20 minutes, and raise the temperature to 100°C. After 6 hours of reaction Cool for 30 minute...

Embodiment 2

[0037] A method for preparing a fluorine-containing hydrophobic and oil-resistant modified nanocellulose for food wrapping paper according to this embodiment, the method specifically includes the following steps:

[0038] (1) First, add water to the purchased nanocellulose (made by TEMPO oxidation-mechanical treatment of softwood pulp fibers) to prepare a 1% nanocellulose suspension, and put 1% nanocellulose in the reactor The aqueous suspension was evaporated so that the suspension became gel-like. Add dispersant N-N-dimethylformamide and gelatinous nanocellulose into another reactor according to the ratio, mix well, then keep stirring in the reactor at constant temperature for 3 hours at 90°C, and then add trifluoroacetic acid anhydride and 4-dimethylaminopyridine (the mass ratio of nanocellulose, trifluoroacetic anhydride, and 4-dimethylaminopyridine is 1:50:1.0), then disperse for 15 minutes, and raise the temperature to 100°C, and react for 5 hours Cool for 30 minutes, a...

Embodiment 3

[0041] A method for preparing a fluorine-containing hydrophobic and oil-resistant modified nanocellulose for food wrapping paper according to this embodiment, the method specifically includes the following steps:

[0042] (1) First, add water to the purchased nanocellulose (made by TEMPO oxidation-mechanical treatment of softwood pulp fibers) to prepare a 1.2% nanocellulose suspension, and 1.2% nanocellulose in the reactor The aqueous suspension was evaporated so that the suspension became gel-like. Add dispersant N-N-dimethylformamide and gelatinous nanocellulose into another reactor according to the ratio, mix well, then keep stirring in the reactor at constant temperature for 4 hours at 90°C, and then add trifluoroacetic acid anhydride and 4-dimethylaminopyridine (the mass ratio of nanocellulose, trifluoroacetic anhydride, and 4-dimethylaminopyridine is 1:50:0.5), then disperse for 10 minutes, and raise the temperature to 100°C, and react for 3 hours Cool for 30 minutes, a...

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Abstract

The invention discloses fluorine-contained hydrophobic oil-proof modified nanocellulose for food packaging paper and a preparation method of the nanocellulose and belongs to the technical field of functional materials. According to the preparation method, firstly, oxidized nanocellulose is diluted into a nanocellulose water suspension with the concentration of 1-1.5%, then evaporation is performedto obtain gel nanocellulose, then trifluoroacetic anhydride and 2,2-difluoroethylamine are sequentially used for modifying the nanocellulose, and the fluorine-contained hydrophobic oil-proof modifiednanocellulose is obtained. The fluorine-contained hydrophobic oil-proof modified nanocellulose has good water resistance and film-forming performance; after the nanocellulose is spread on the surfaceof the food packaging paper, a uniform film can be formed to effectively prevent permeation of water vapor and oxygen, and therefore the shelf life of food is prolonged; and besides, since the nanocellulose has a great specific surface area and contains abundant hydroxide radicals, the nanocellulose can be tightly combined with fibers, the binding force between the fibers and the strength of thepaper are improved, and the reliability of the food packaging paper in use is improved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a fluorine-containing hydrophobic and oil-resistant modified nano-cellulose for food wrapping paper and a preparation method thereof. Background technique [0002] With the improvement of people's awareness of environmental protection and the promulgation of the national ban on plastics, many areas no longer use plastics as packaging materials, and replace them with recyclable, degradable, and non-white pollution paper. However, food packaging paper has disadvantages such as poor oxygen resistance and water vapor performance in the case of high ambient humidity, which will affect its use effect and the safety of its packaged food. If wax coating or coating is used, there will be safety risks. . Therefore, the present invention aims at this problem and develops a novel hydrophobically modified nano-cellulose composite emulsion as a surface sizing agent to...

Claims

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Application Information

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IPC IPC(8): C08B15/06D21H19/34D21H19/28D21H19/14D21H21/14D21H21/36D21H27/10
CPCC08B15/06D21H19/14D21H19/28D21H19/34D21H21/14D21H21/36D21H27/10
Inventor 赵新民邱旭峰杨柳青林俊辉刘敏陈宪
Owner 浙江恒川新材料有限公司
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