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Biodegradable high-barrier coated paper as well as preparation method and application thereof

A biodegradable and coated paper technology, applied in the field of coated paper, can solve the problems of environmental pollution, biodegradability and other problems, and achieve the goals of alleviating environmental pollution, excellent barrier performance, good oxygen barrier performance and water vapor barrier performance Effect

Inactive Publication Date: 2022-01-11
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-barrier paper-based packaging materials are mostly composed of paper and non-degradable plastics such as polyethylene (PE), polypropylene (PP), ethylene-vinyl alcohol copolymer (EVOH), etc., which cannot be biodegradable. requirements, there are still environmental pollution problems

Method used

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  • Biodegradable high-barrier coated paper as well as preparation method and application thereof
  • Biodegradable high-barrier coated paper as well as preparation method and application thereof
  • Biodegradable high-barrier coated paper as well as preparation method and application thereof

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preparation example Construction

[0044] The invention provides a kind of preparation method of biodegradable high barrier coated paper, comprising the following steps:

[0045] Preparation of S1 barrier layer: Coat the polyvinyl alcohol / nanocellulose composite coating on the base paper surface. After coating, place the coated paper at 40-70°C to dry for 30-120 minutes. The preferred drying method and conditions are: Dry in an oven at 70°C for 60 minutes. The drying method can also be selected according to the needs and conditions: natural drying, hot plate drying, far-infrared drying, vacuum drying, microwave drying, etc.;

[0046] S2 Preparation of the heat-sealing layer: apply the cellulose acetate solution on the barrier layer obtained in step S1, and after the coating is completed, place the coated paper indoors to dry naturally for 30-120 minutes to obtain the biological Degradable high barrier coated paper.

[0047] In some embodiments of the present invention, in step S1, the coated base paper is sing...

Embodiment 1

[0070] A preparation method of biodegradable high barrier coated paper, comprising the following steps:

[0071] (1) Preparation of polyvinyl alcohol / nanocellulose composite coating: 8.62g of TEMPO oxidized nanocellulose (5-10 μm in length, 10-20nm in diameter) with a solid content of 1.16% was added to 81.48ml deionized water, and the The rod was fully stirred until there was no obvious agglomeration, and the nanocellulose solution was obtained by ultrasonication for 1 h at 80 Hz in an ice-water bath at 0°C. Add 9.9 g of polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 90% (mol fraction) into the above-mentioned nanocellulose solution, then heat at 90°C, and stir for 4 hours at a speed of 350r / min until a uniform Transparent solution, that is, polyvinyl alcohol / nanocellulose mixed solution; the polyvinyl alcohol / nanocellulose mixed solution is left to defoam for 2 hours, and the solution is cooled to room temperature for later use to ob...

Embodiment 2

[0080] A preparation method of biodegradable high barrier coated paper, comprising the following steps:

[0081] (1) Preparation of polyvinyl alcohol / nanocellulose composite coating: 8.62g of quaternary ammonium salt modified cationic nanocellulose (length 1-10 μm, diameter<20nm) with a solid content of 1.27% was added to 81.48ml deionized water, Stir well with a glass rod until there is no obvious agglomeration, and take 9.8 g of polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 97% (mole fraction) and add it to the above nanocellulose solution , and then heated at 90°C, and stirred at a speed of 400r / min for 4h until a uniform transparent solution was obtained, that is, the polyvinyl alcohol / nanocellulose mixed solution; the polyvinyl alcohol / nanocellulose mixed solution was left to defoam 2h. Wait for the solution to cool down to room temperature for later use.

[0082] (2) Preparation of cellulose acetate solution: 10g degree of subs...

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Abstract

The invention relates to biodegradable high-barrier coated paper and a preparation method and application thereof. The method comprises the following steps of: S1, preparation of a barrier layer: coating the surface of raw paper with a polyvinyl alcohol / nanocellulose composite coating, and after coating is completed, drying the coated paper at 40-70 DEG C for 30-120 min to obtain coated paper with a barrier layer; and S2, preparation of a heat sealing layer: coating the barrier layer obtained in the step S1 with a cellulose acetate solution, and after coating is completed, air-drying the coated paper in a room for 30-120 min to obtain the high-barrier coated paper. The coated paper prepared by the invention has good oxygen barrier and water vapor barrier properties, and can realize heat sealing at the same time, so that the coated paper can well meet the requirement of simultaneously completing feeding and packaging on an automatic packaging machine. The coated paper is an environment-friendly packaging material with excellent performance, and can be used for packaging food such as fruits and vegetables and biscuits and packaging products such as medicines and electronic devices.

Description

technical field [0001] The invention relates to the field of coated paper, in particular to a biodegradable high-barrier coated paper and a preparation method and application thereof. Background technique [0002] Packaging materials with high barrier properties are indispensable for industries such as food, medicine, and electronics. Traditional barrier packaging materials are mostly based on non-degradable petroleum-based plastic materials. In recent years, the extensive use of disposable plastic products has brought serious environmental pollution problems. With the improvement of people's awareness of environmental protection and the increasingly stringent policy of "banning and limiting plastics", it is becoming more and more important to seek an environmentally friendly and economical biodegradable high-barrier material. urgent needs of today's society. [0003] As a renewable, sustainable and biodegradable green material, paper is widely used in the packaging field. ...

Claims

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Application Information

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IPC IPC(8): D21H27/10D21H19/82D21H19/34D21H19/20D21H19/14D21H21/14
CPCD21H27/10D21H19/824D21H19/34D21H19/20D21H19/14D21H21/14
Inventor 许凤王珺雅陈胜游婷婷曹梦遥
Owner BEIJING FORESTRY UNIVERSITY
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