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High-strength high-barrier fresh-keeping plastic film used for vegetable and fruit packaging and preparation method of plastic film

A plastic film, high barrier technology, applied in the field of packaging materials, can solve the problems affecting the service life and hand feel of the barrier material, the bonding strength of the composite layer is not high, and the mechanical properties are reduced, so as to achieve a simple and controllable preparation process scheme and improve the mechanical properties. and barrier properties, the effect of high toughness

Inactive Publication Date: 2018-08-24
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects that the bonding strength between the composite layers is not high in the current multi-layer composite technology, and the direct mixing of gas-adsorbing porous substances into the plastic film leads to a decrease in the mechanical properties of the film matrix, which affects the service life and hand feeling of the barrier material, the present invention A high-strength high-barrier fresh-keeping plastic film for fruit and vegetable packaging and its preparation method are proposed. By enhancing the strength of the joints between the composite layers, the barrier performance of the film for fruit and vegetable packaging is improved, the storage time is delayed, and the freshness preservation effect is achieved.

Method used

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  • High-strength high-barrier fresh-keeping plastic film used for vegetable and fruit packaging and preparation method of plastic film
  • High-strength high-barrier fresh-keeping plastic film used for vegetable and fruit packaging and preparation method of plastic film
  • High-strength high-barrier fresh-keeping plastic film used for vegetable and fruit packaging and preparation method of plastic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) According to the mass ratio of 1:0.5:20, the activated clay with a particle size of 3 μm, a radial size of 7 μm, and amphiphilic graphene oxide and styrene with a thickness of 0.5 nm are weighed;

[0033] (2) Add the amphiphilic graphene oxide into an organic solvent, disperse by ultrasonic, the ultrasonic power is 5kW, and the ultrasonic time is 30 minutes to obtain a uniform dispersion, then add activated clay, stir at high speed, and the speed of stirring at high speed is 1200rpm, The stirring time is 80 minutes, and the amphiphilic graphene oxide is uniformly wrapped with activated clay, and the viscosity is adjusted to obtain an activated clay / amphiphilic graphene oxide composite dispersion with a viscosity of 2.6 Pa·s;

[0034] (3) By the scraping method, the scraping rate is controlled to be 100nm / min, and the activated clay / amphiphilic graphene oxide composite dispersion is coated on the surface of a hyperbranched polyamide film substrate with a thickness of 10...

Embodiment 2

[0037] (1) According to the mass ratio of 1:1.3:25, the activated clay with a particle size of 10 μm, a radial size of 8 μm, and amphiphilic graphene oxide and perchlorethylene with a thickness of 1.3 nm are weighed;

[0038] (2) Add the amphiphilic graphene oxide into an organic solvent, disperse by ultrasonic, the ultrasonic power is 2.5kW, and the ultrasonic time is 35 minutes to obtain a uniform dispersion, then add activated clay, stir at a high speed, and the stirring rate at a high speed is 450rpm , the stirring time is 40 minutes, the amphiphilic graphene oxide is uniformly wrapped with activated clay, and the viscosity is adjusted to obtain an activated clay / amphiphilic graphene oxide composite dispersion with a viscosity of 2.8Pa·s;

[0039] (3) by the scraping method, control the scraping coating rate to be 300nm / min, the activated clay / amphiphilic graphene oxide composite dispersion is coated on the surface of the hyperbranched polyurethane film matrix with a thickn...

Embodiment 3

[0042] (1) According to the mass ratio of 1:1.2:35, the activated clay with a particle size of 5 μm, a radial size of 7 μm, and amphiphilic graphene oxide, pentane and hexane with a thickness of 1.5 nm are weighed;

[0043] (2) Add the amphiphilic graphene oxide into an organic solvent, disperse by ultrasonic, the ultrasonic power is 2kW, and the ultrasonic time is 45 minutes to obtain a uniform dispersion, then add activated clay, stir at high speed, and the speed of stirring at high speed is 900rpm, The stirring time is 65 minutes, and the amphiphilic graphene oxide is uniformly wrapped with activated clay, and the viscosity is adjusted to obtain an activated clay / amphiphilic graphene oxide composite dispersion with a viscosity of 3.8 Pa·s;

[0044] (3) by scraping method, control described scraping coating coating speed to be 210nm / min, described activated clay / amphiphilic graphene oxide composite dispersion liquid is coated on the hyperbranched polyurethane film substrate s...

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Abstract

The invention provides a high-strength high-barrier fresh-keeping plastic film used for vegetable and fruit packaging and a preparation method of the plastic film. The method comprises the following steps: performing ultrasonic dispersion on activated argil and surface-modified amphiphilic graphene oxide in a solvent to obtain a uniform dispersion liquid, coating the surface of a hyperbranched film substrate with the dispersion liquid, performing drying solidification to form a composite film, and finally coating the surface of the graphene oxide with a layer of SiO2 film through magnetron sputtering to obtain the high-barrier plastic film with a three-layer composite structure. The method provided by the invention overcomes the defects that bonding strength among composite layers in a current layer compounding technology is not high, the mechanical properties of the film substrate are reduced because a gas adsorbing porous substance is directly mixed into a plastic film, and service life and hand feeling of a barrier material are affected, the mechanical properties of the plastic film as a fruit and vegetable packaging film is greatly improved, the barrier properties of the film and the service life of the film are improved, and the storage time of fruits and vegetables is prolonged.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a high-strength high-barrier fresh-keeping plastic film for fruit and vegetable packaging and a preparation method thereof. Background technique [0002] With the development of the economy and the improvement of living standards, people's dietary life has transitioned from the single type of food and clothing in the past to the current type of diversified nutrition. The demand for vegetables and fruits is increasing, and the requirements for their freshness are also getting higher and higher. Unlike other foods, fruits and vegetables do not die after being picked, but remain alive. Vegetables and fruits maintain life by means of respiration during storage. In the process of respiration, vegetables and fruits inhale oxygen, exhale carbon dioxide, produce ethylene gas, and reduce water. Respiration will result in consumption of internal components, softening of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/34B32B27/36B32B33/00B29D7/01
CPCB32B27/08B29D7/01B32B27/34B32B27/36B32B33/00B32B2250/24B32B2255/10B32B2255/20B32B2307/7242B32B2307/758B32B2439/70
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD
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