Fluoride-free oil-proof paper as well as preparation method and application thereof

A technology for oil-proof paper and paper, applied in paper, papermaking, packaging paper, etc., can solve the problems of unsuitable industrial production and expensive raw materials, and achieve the effects of good mechanical properties, easy degradation and low porosity

Inactive Publication Date: 2019-12-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the raw materials are expensive and not suitable for industrial production

Method used

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  • Fluoride-free oil-proof paper as well as preparation method and application thereof
  • Fluoride-free oil-proof paper as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0029] A preparation method of fluorine-free oil-proof paper, comprising the following steps:

[0030] (1) Sodium hydroxide, urea and water are mixed homogeneously, obtain sodium hydroxide / urea / water solution, the mass ratio of described sodium hydroxide, urea and water is 6:15:79, then described sodium hydroxide / The urea / water solution is subjected to pre-cooling treatment, the temperature of the pre-cooling treatment is -12°C, and the time of the pre-cooling treatment is 5 minutes to obtain a pre-cooled solution;

[0031] (2) 4g dissolving pulp (its cellulose content 95wt%) is added in the solution after the described pre-cooling of step (1), mix uniformly, obtain mixed solution, described mixed solution is carried out freezing treatment, described freezing treatment The temperature is -12°C, the freezing time is 12 hours, and then thawed at room temperature, centrifuged at a speed of 4000 rpm for 25 minutes, and the supernatant is taken to obtain the cellulose coating;

...

Embodiment 2

[0034] A preparation method of fluorine-free oil-proof paper, comprising the following steps:

[0035] (1) sodium hydroxide, urea and water are mixed homogeneously, obtain sodium hydroxide / urea / water solution, the mass ratio of described sodium hydroxide, urea and water is 8:12:80, then described sodium hydroxide / The urea / water solution is subjected to pre-cooling treatment, the temperature of the pre-cooling treatment is -20°C, and the time of the pre-cooling treatment is 10 minutes to obtain a pre-cooled solution;

[0036] (2) 4g of dissolving pulp (the cellulose content is 97%) is added in the solution after the pre-cooling described in step (1), mix uniformly, obtain mixed liquor, described mixed liquor is carried out freezing treatment, described freezing treatment The temperature is -20°C, the freezing time is 24 hours, then thawed at room temperature, centrifuged at 6000 rpm for 20 minutes, and the supernatant is taken to obtain the cellulose coating;

[0037] (3) the...

Embodiment 3

[0039] A preparation method of fluorine-free oil-proof paper, comprising the following steps:

[0040] (1) Sodium hydroxide, urea and water are mixed homogeneously, obtain sodium hydroxide / urea / water solution, the mass ratio of described sodium hydroxide, urea and water is 10:10:80, then described sodium hydroxide / urea The urea / water solution is subjected to pre-cooling treatment, the temperature of the pre-cooling treatment is -16°C, and the time of the pre-cooling treatment is 10 minutes to obtain the pre-cooled solution;

[0041] (2) 4g of dissolving pulp (the cellulose content is 99%) is added in the solution after the pre-cooling described in step (1), mix uniformly, obtain mixed liquor, described mixed liquor is carried out freezing treatment, described freezing treatment The temperature is -16°C, the freezing time is 18 hours, then thawed at room temperature, centrifuged at 8000 rpm for 15 minutes, and the supernatant is taken to obtain the cellulose coating;

[0042] ...

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Abstract

The invention belongs to the technical field of oil-proof paper, and discloses fluoride-free oil-proof paper as well as a preparation method and an application thereof. The preparation method of the oil-proof paper comprises the following steps: putting a sodium hydroxide/urea/water solution into a refrigerator for precooling, moving out the mixed solution, adding dissolved pulp, stirring the mixture at room temperature, and then placing the mixture into the refrigerator for freezing treatment; moving out the mixture after a period of time, and unfreezing the mixture at room temperature; carrying out centrifugal treatment, and collecting supernate to obtain a transparent cellulose coating; coating paper with the obtained cellulose coating, then soaking the paper in a coagulating bath, andcoagulating the coating for a period of time at a certain temperature; and drying the paper to obtain the fluoride-free oil-proof paper. According to the invention, a cellulose regeneration method isadopted to cover the surface of the paper, so that hydrogen bonds among cellulose are rearranged, pores are reduced, and the paper has good barrier property on grease, organic solvents, water vapor and the like. The fluoride-free oil-proof paper provided by the invention can be used in the field of food packaging, and has a good application prospect in preparation of disposable tableware.

Description

technical field [0001] The invention belongs to the technical field of oil-proof paper, and in particular relates to a fluorine-free oil-proof paper and a preparation method and application thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, oil-proof paper gradually replaces polyethylene, polypropylene and other plastic containers or film packaging materials. However, ordinary paper-based materials cannot achieve the oil-proof effect due to their high porosity. At present, fluorine-containing oil-repellent additives are commonly used in developed countries. The surface of fluorine atoms contains more negative charges, and the atomic volume is larger, which can form a dense thin layer with low surface energy and reduce the contact between fibers and liquids. Interaction, coating a layer of these chemicals on the surface of the paper can give the paper good oil repellency. This method recently reported by Professor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10D21H23/22D21H25/04D21H25/06D21H19/12
CPCD21H19/12D21H23/22D21H25/04D21H25/06D21H27/10
Inventor 徐峻谢俊贤杨仁党陈克复
Owner SOUTH CHINA UNIV OF TECH
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