CN218749784U - High-barrier paper-plastic composite biodegradable film - Google Patents

Abstract

The utility model discloses a high-barrier paper-plastic composite biodegradable film, which comprises a co-extrusion high-barrier degradable film, a bonding layer coated on the upper surface of the co-extrusion high-barrier degradable film, and a paper layer bonded with the co-extrusion high-barrier degradable film through the bonding layer; the co-extrusion high-barrier degradation film comprises a barrier layer, a co-extrusion PLA corona layer, a co-extrusion PLA enhancement layer and a co-extrusion PLA low-temperature heat sealing layer from top to bottom; the barrier layer is formed by applying an aqueous coating solution of modified PVA. The utility model discloses degradable, green and gaseous separation nature is excellent.

Description

High-barrier paper-plastic composite biodegradable film

Technical Field

The utility model belongs to the technical field of the degradable membrane, concretely relates to compound biodegradable plastic film is moulded to high resistant separation paper.

Background

With the increase of commodity circulation speed, the consumption of plastic packaging products is increasing day by day, and the problem of environmental pollution caused by the plastic packaging products is becoming more serious. The materials used by the current plastic flexible packaging materials are mostly single plastic film materials or composite films such as PET, PA, PE, CPP and the like, have rich varieties and excellent performance, but have the defects of no degradation, high recycling difficulty and potential damage to the environment.

In the aspect of degradation materials, most of the degradation materials circulating in the market at present are prepared by blending PBAT and PLA materials, the temperature resistance and the softness of the materials are improved by adding CaCO3 and starch to meet the requirement of using performance, but the prepared degradation film has the condition of low barrier property, and the used resin raw materials are all non-high barrier materials, so that the degradation film has great limitation in the field of flexible package application and cannot meet the using conditions of a plurality of package products with the requirement on the barrier property.

The reverse kiss coater shown in fig. 3 is used for coating glue solution, the quantity and depth of the wires of the wire roll and the wrap angle of the film and the wire roll control the coating quantity together, and the coating is carried out by the coater, so that the coating surface is smooth.

SUMMERY OF THE UTILITY MODEL

To the problem that the above-mentioned background art provided, the utility model aims at: aims to provide a high-barrier paper-plastic composite biodegradable film.

In order to realize the technical purpose, the utility model discloses a technical scheme as follows:

a high-barrier paper-plastic composite biodegradable film comprises a co-extrusion high-barrier degradable film, a bonding layer coated on the upper surface of the co-extrusion high-barrier degradable film, and a paper layer bonded with the co-extrusion high-barrier degradable film through the bonding layer;

the co-extrusion high-barrier degradation film comprises a barrier layer, a co-extrusion PLA corona layer, a co-extrusion PLA enhancement layer and a co-extrusion PLA low-temperature heat sealing layer from top to bottom;

the barrier layer is formed by coating a modified PVA aqueous coating liquid.

Further define, the paper layer is the kraft paper, and such structural design is convenient for carry out the surface printing production on the paper layer, and the kraft paper itself possesses the degradation characteristic, buries for a long time and handles and can accomplish the degradation.

Further limited, the bonding layer is formed by coating the two-component solvent-free polyurethane adhesive, and due to the structural design, the two-component solvent-free polyurethane adhesive has no solvent, so that the VOC tail gas emission can be reduced, and the environmental pollution can be reduced.

Further inject, the number of piles of crowded PLA corona layer altogether, crowded PLA enhancement layer altogether and crowded PLA low temperature heat-seal layer altogether is the three-layer, and such structural design through multilayer design, increases overall structure intensity.

The thickness of the barrier layer is 10-50um, and the barrier performance of the barrier layer is controlled by adjusting the thickness of the coating layer through the structural design, so that the use requirements of different scenes are met.

Further define, the corona value of crowded PLA corona layer altogether is more than or equal to 38 dynes, and such structural design guarantees to crowd PLA corona layer surface polarity altogether, improves the adhesion strength of the barrier layer that PVA formed and film.

The utility model has the advantages that:

1. the gas barrier is degradable, green and environment-friendly, and has excellent gas barrier property;

2. the co-extruded high-barrier degradable film can be directly used as an original film, can also be matched with a paper material for composite processing, and has wider adaptability.

Drawings

The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

FIG. 1 is a schematic structural view of an embodiment of a high-barrier paper-plastic composite biodegradable film of the present invention;

FIG. 2 is a schematic structural view of a co-extruded high-barrier degradable film in an embodiment of the high-barrier paper-plastic composite biodegradable film of the present invention;

FIG. 3 is a schematic view of a reverse kiss coater;

the main element symbols are as follows:

a paper layer 1;

an adhesive layer 2;

co-extruding a high-barrier degradable film 3;

a barrier layer 31, a co-extrusion PLA corona layer 32, a co-extrusion PLA enhancement layer 33 and a co-extrusion PLA low-temperature heat-sealing layer 34.

Detailed Description

In order to make the technical solution of the present invention better understood, the following description is provided for the purpose of illustrating the present invention with reference to the accompanying drawings and embodiments.

As shown in fig. 1-3, the high-barrier paper-plastic composite biodegradable film of the present invention comprises a co-extrusion high-barrier degradable film 3, a bonding layer 2 coated on the upper surface of the co-extrusion high-barrier degradable film 3, and a paper layer 1 bonded to the co-extrusion high-barrier degradable film 3 through the bonding layer 2;

the co-extruded high-barrier degradation film 3 comprises a barrier layer 31, a co-extruded PLA corona layer 32, a co-extruded PLA enhancement layer 33 and a co-extruded PLA low-temperature heat-sealing layer 34 from top to bottom;

the barrier layer 31 is formed by applying an aqueous coating solution of modified PVA.

In the embodiment, firstly, a co-extrusion high-barrier degradable film 3 is prepared;

the co-extrusion high-barrier degradation film 3 is firstly connected with a co-extrusion PLA corona layer 32, a co-extrusion PLA enhancement layer 33 and a co-extrusion PLA low-temperature heat sealing layer 34, and finally the modified PVA aqueous coating liquid is smeared by a reverse kiss coating machine to form a barrier layer 31, and the barrier layer 31, the co-extrusion PLA corona layer 32, the co-extrusion PLA enhancement layer 33 and the co-extrusion PLA low-temperature heat sealing layer 34 form the co-extrusion high-barrier degradation film 3 together; the co-extrusion PLA enhancement layer 33 is used for improving the performances of the co-extrusion high-barrier degradable film 3 such as tensile strength, stiffness, hardness and the like, the density of raw materials selected for the co-extrusion PLA low-temperature heat sealing layer 34 is low, so that the sealing temperature is low, the production efficiency of the film in the production process can be improved, the barrier layer 31 has the following functions of blocking gas and keeping fragrance, and through tests, the gas transmittance of the barrier layer 31 with the thickness of 50 microns can reach not more than 1 cc/square meter 24h under the conditions that the temperature is 40 ℃ and the relative humidity is 50%, and the use requirement of a high-barrier material can be met;

then, coating an adhesive layer 2, and adhering the paper layer 1 and a co-extruded high-barrier degradation film 3, wherein the paper layer 1 is used for surface printing;

the main components of the modified PVA aqueous coating liquid are carbon, hydrogen, oxygen, silicon, nano inorganic particles and polar groups, the modified PVA aqueous coating liquid is degradable and recyclable, only CO2 and water are generated after combustion, and the environment is not polluted;

the co-extruded high-barrier degradation film 3 has good printing and composite adaptability due to the coating of the modified PVA aqueous coating liquid and the polar groups, and the co-extruded high-barrier degradation film 3 can be directly used as an original film and can also be compounded with materials such as paper and the like for processing; the nano inorganic particles improve the wear resistance, temperature resistance and light reflectivity of the co-extruded high-barrier degradation film 3.

Preferably, the paper layer 1 is kraft paper, and such structural design is convenient for carry out the surface printing production on the paper layer 1, and the kraft paper itself has the degradation characteristic, and long-term landfill treatment can accomplish the degradation. In practice, other types of paper layers 1 may also be specifically considered as the case may be.

Preferably, the bonding layer 2 is formed by coating a two-component solvent-free polyurethane adhesive, and due to the structural design, the two-component solvent-free polyurethane adhesive has no solvent, so that the VOC tail gas emission can be reduced, and the environmental pollution can be reduced. In practice, other types of adhesive layer 2 may be specifically considered as the case may be.

Preferably, the number of layers of the co-extrusion PLA corona layer 32, the co-extrusion PLA enhancement layer 33 and the co-extrusion PLA low-temperature heat-sealing layer 34 is three, and the structural design increases the overall structural strength through multilayer design. In fact, other structural shapes of the co-extruded PLA corona layer 32, the co-extruded PLA enhancement layer 33 and the co-extruded PLA low-temperature heat-seal layer 34 can be specifically considered according to specific situations.

Preferably, the thickness of the barrier layer 31 is 10-50um, and the structural design controls the barrier property of the barrier layer by adjusting the thickness of the coating layer, so that the use requirements of different scenes are met. In fact, other structural shapes of the barrier layer 31 may be specifically contemplated as the case may be.

Preferably, the corona value of the co-extruded PLA corona layer 32 is more than or equal to 38 dynes, and the structural design ensures the surface polarity of the co-extruded PLA corona layer 32 and improves the adhesive strength between the barrier layer 31 formed by PVA and the film. In fact, other structural shapes of the coextruded PLA corona layer 32 may be specifically contemplated as the case may be.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (6)

1. A high resistant separates paper and moulds compound biodegradable film which characterized in that: comprises a co-extrusion high-barrier degradation film (3), a bonding layer (2) coated on the upper surface of the co-extrusion high-barrier degradation film (3), and a paper layer (1) bonded with the co-extrusion high-barrier degradation film (3) through the bonding layer (2);

the co-extrusion high-barrier degradation film (3) comprises a barrier layer (31), a co-extrusion PLA corona layer (32), a co-extrusion PLA enhancement layer (33) and a co-extrusion PLA low-temperature heat-sealing layer (34) from top to bottom;

the barrier layer (31) is formed by applying an aqueous coating solution of modified PVA.

2. The high-barrier paper-plastic composite biodegradable film according to claim 1, characterized in that: the paper layer (1) is kraft paper.

3. The high-barrier paper-plastic composite biodegradable film according to claim 2, characterized in that: the bonding layer (2) is formed by coating a double-component solvent-free polyurethane adhesive.

4. The high-barrier paper-plastic composite biodegradable film according to claim 3, characterized in that: the number of layers of the co-extrusion PLA corona layer (32), the co-extrusion PLA enhancement layer (33) and the co-extrusion PLA low-temperature heat-sealing layer (34) is three.

5. The high-barrier paper-plastic composite biodegradable film according to claim 4, characterized in that: the thickness of the barrier layer (31) is 10-50um.

6. The high-barrier paper-plastic composite biodegradable film according to claim 5, characterized in that: the corona value of the co-extruded PLA corona layer (32) is greater than or equal to 38 dynes.

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