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Preparation method of graphene oxide/nano cellulose/polyvinyl alcohol composite film

A technology of nano-cellulose and polyvinyl alcohol, which is applied in the field of composite packaging film preparation, can solve the problems of poor mechanical properties and barrier properties of degradable polyvinyl alcohol packaging films, and achieve high light transmittance

Active Publication Date: 2017-05-24
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem of poor mechanical properties and barrier properties of the existing degradable polyvinyl alcohol packaging film, and provides a preparation method of graphene oxide / nanocellulose / polyvinyl alcohol composite film

Method used

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  • Preparation method of graphene oxide/nano cellulose/polyvinyl alcohol composite film
  • Preparation method of graphene oxide/nano cellulose/polyvinyl alcohol composite film
  • Preparation method of graphene oxide/nano cellulose/polyvinyl alcohol composite film

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Experimental program
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specific Embodiment approach 1

[0028] Specific embodiment one: the preparation method of graphene oxide / nanocellulose / polyvinyl alcohol composite film in this embodiment is carried out according to the following steps:

[0029] 1. Preparation of nanocellulose;

[0030] Two, prepare graphene oxide;

[0031] 3. Preparation of nanocellulose / polyvinyl alcohol mixed solution:

[0032]Mix 13.56ml of nanocellulose suspension with a concentration of 5.9g / L, 3.919g of polyvinyl alcohol and 86.44ml of distilled water in a 90°C water bath at a high speed of 500r / min for 2h to obtain a nanocellulose / polyvinyl alcohol mixed solution ;

[0033] 4. Graphene oxide solution equipment:

[0034] Prepare a graphene oxide solution with a weight percentage of 0.1wt%-0.3wt%, and ultrasonically treat it for 30 minutes to obtain a graphene oxide solution;

[0035] 5. Preparation of composite film: Pour the graphene oxide solution into the nanocellulose / polyvinyl alcohol mixed solution, stir and mix evenly, and then ultrasonical...

specific Embodiment approach 2

[0042] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the preparation method of nanocellulose in step one is as follows:

[0043] Weigh 7g of microcrystalline cellulose, add it to 100mL of sulfuric acid solution with a mass fraction of 64%, stir it with a magnetic stirrer to make it evenly mixed, then put it in a water bath at 40°C and stir at a speed of 500r / min for 2h, and then sonicate for 15min , dilute with 1000ml deionized water, end the reaction, let it stand for 24 hours, pour off the supernatant, collect the lower layer solution and put it in a centrifuge washing at a speed of 8000r / min, until it is in the form of a non-layered hydrosol colloid, collect the colloid and put it in a dialysis bag , using deionized water as the dialysate, dialyzed until the pH value of the suspension colloid is 7, to obtain nanocellulose. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0044] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the preparation method of graphene oxide in step 2 is as follows:

[0045] (1) 1.0g natural flake graphite, 1.0g NaNO 3 Mix with 46mL of concentrated sulfuric acid with a mass fraction of 98%, place it in an ice bath at 5°C, stir for 1 hour, and mix well to obtain a mixed solution;

[0046] (2) Add 6g KMnO to the mixture 4 , stirred for 1 h, then moved the solution to a water bath at 50°C, and stirred at a speed of 500 r / min for 4 h, the solution changed from black to taupe;

[0047] (3) Raise the temperature in the water bath to 85°C, and stir at a speed of 500r / min for 1h to obtain a soil brown suspension solution;

[0048] (4) The obtained soil brown suspension solution is poured into 200mL H 2 o 2 In deionized aqueous solution, treated in an ice bath, the suspension turns brownish yellow, and the suspension is allowed to stand at room temperature for 24 h...

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Abstract

The invention relates to a preparation method of a graphene oxide / nano cellulose / polyvinyl alcohol composite film. The method aims to solve the problems of poor mechanical properties and poor barrier properties of the existing degradable polyvinyl alcohol packaging film. The method comprises the following steps: 1. preparing nano cellulose; 2. preparing graphene oxide; 3. preparing a nano cellulose / polyvinyl alcohol mixed solution; 4. preparing a graphene oxide solution; and 5. preparing the composite film. The composite film has favorable mechanical properties; the tensile strength can reach 101.49 MPa which is enhanced by 42.4% as compared with the PVA (polyvinyl alcohol) film; the oxygen barrier property is enhanced by 2.08 times as compared with the pure PVA film; the thermal decomposition temperature is enhanced by 10-20 DEG C; and the composite film has higher light transmittance. The method belongs to the field of preparation of composite packaging films.

Description

technical field [0001] The invention relates to a preparation method of a composite packaging film. Background technique [0002] Polyvinyl alcohol (PVA) has good biodegradability, film-forming property, printability, environmental friendliness and solubility. It is one of the packaging materials with great application potential and is widely used in packaging, biomedical and other industries. However, the molecular chain of polyvinyl alcohol contains a large number of hydroxyl groups, and there are a large number of hydrogen bonds in the molecule. The mechanical properties and barrier properties of biodegradable materials prepared from it often cannot meet higher requirements for use. Therefore, improving the mechanical properties of polyvinyl alcohol and improving its barrier properties have become the main problems to be solved urgently. [0003] The size of nanocellulose (NCC) reaches the nanoscale, light weight and high strength. Therefore, when it is combined with som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08L1/02C08K3/04
CPCC08J5/18C08J2329/04C08J2401/02C08L29/04C08L2201/10C08L2201/14C08L2203/16C08L1/02C08K3/04
Inventor 徐淑艳谢元仲张维丽
Owner NORTHEAST FORESTRY UNIVERSITY
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