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Biodegradable high-barrier paper-plastic packaging composite film and preparation method thereof

A biodegradable, high-barrier technology, applied in the field of packaging materials, can solve problems such as the need to control the degradation rate, increase the cost of raw materials, lack of elasticity and flexibility, etc., achieve good printing performance and appearance, control production and processing costs, and good composite fastness degree of effect

Pending Publication Date: 2021-11-09
JIANGSU LEATER GREEN PACKAGING CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although PLA has many advantages, there are also many shortcomings in practical applications: such as PLA's poor toughness, lack of elasticity and flexibility, hard texture and high brittleness, relatively low solution strength, and slow crystallization rate. Its application in many aspects
The chemical structure of PLA contains a large number of ester bonds, resulting in poor hydrophilicity, and the degradation rate needs to be controlled, etc.
Moreover, the high price of PLA increases the cost of raw materials and limits its commercial promotion.

Method used

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  • Biodegradable high-barrier paper-plastic packaging composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation method of the biodegradable high-barrier paper-plastic packaging composite film provided by the present invention comprises the following steps:

[0050] 1) Use gravure printing technology to print degradable water-based ink on the surface of kraft paper;

[0051] 2) In parts by weight, add 55 parts of PLA particles and 1 part of bifunctional compatibilizer KT20 into the casting machine, mix for 20 minutes and then raise the temperature to 175°C to make the PLA particles reach a molten state, then cool down to 140°C, add 18 1 part of PBAT and 10 parts of PPC were mixed for 2 hours and then extruded through a flat die to form a film at a film forming temperature of 50°C to obtain PLA layer 5;

[0052] 3) Vacuum-deposit a layer of aluminum foil on the PLA layer 5 to form the aluminum-coated layer 4;

[0053] 4) Bond the kraft paper to the aluminized layer 4 with a solvent-free polyurethane adhesive. The specific steps are: at room temperature, roll-coat c...

Embodiment 2

[0055] The preparation method of the biodegradable high-barrier paper-plastic packaging composite film provided by the present invention comprises the following steps:

[0056] 1) Use gravure printing technology to print degradable water-based ink on the surface of wood pulp paper;

[0057] 2) In parts by weight, add 58 parts of PLA particles and 2 parts of compatibilizer EsunBio5004K into the casting machine, mix for 30 minutes and then heat up to 170°C to make the PLA particles reach a molten state, then cool down to 150°C and add 20 parts of PBAT and 8 parts of PPC, mixed for 1.5 h, extruded through a flat sheet die to form a film, and the film forming temperature was 40 ° C to obtain PLA layer 5;

[0058] 3) Vacuum-deposit a layer of aluminum foil on the PLA layer 5 to form the aluminum-coated layer 4;

[0059] 4) Bond the wood pulp paper and the aluminum layer 4 with a solvent-free polyurethane adhesive. The specific steps are: mix components A and B of the solvent-free ...

Embodiment 3

[0061] The preparation method of the biodegradable high-barrier paper-plastic packaging composite film provided by the present invention comprises the following steps:

[0062] 1) Use gravure printing technology to print degradable water-based ink on the surface of glassine paper;

[0063] 2) In parts by weight, add 60 parts of PLA particles and 0.5 parts of BASF epoxy chain extender ADR 4468 into the casting machine, mix for 25 minutes and then heat up to 180°C to make the PLA particles reach a molten state, then cool down to 160°C , add 15 parts of PBAT and 5 parts of PPC, mix for 1 hour and extrude through a flat sheet die to form a film at a film forming temperature of 60°C to obtain PLA layer 5;

[0064] 3) Vacuum-deposit a layer of aluminum foil on the PLA layer 5 to form the aluminum-coated layer 4;

[0065] 4) Bond the glassine paper to the aluminum layer 4 with a solvent-free polyurethane adhesive. The specific steps are: roll or spray the one-component solvent-free ...

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Abstract

The invention provides a biodegradable high-barrier paper-plastic packaging composite film and a preparation method thereof. The biodegradable high-barrier paper-plastic packaging composite film sequentially comprises an ink layer, a paper layer, a bonding layer, an aluminized layer and a PLA layer from outside to inside, wherein the PLA layer is modified through a thermoplastic elastomer, and after modification, the temperature resistance and toughness of the PLA layer can be improved, the heat sealing performance of the PLA layer is guaranteed, and the packaging requirements of different contents and different weights are met; and the aluminized layer can ensure that a final finished product has good barrier property and prolong the shelf life of the contents. The biodegradable high-barrier paper-plastic packaging composite film has the advantages of being exquisite in printing appearance, good in display effect and the like, is made of degradable materials, can be biodegraded after being used, and is free of pollution to the environment.

Description

technical field [0001] The invention belongs to the field of packaging materials, and in particular relates to a biodegradable high-barrier paper-plastic packaging composite film and a preparation method thereof. Background technique [0002] Traditional plastic products have become common consumables in people's lives because of their lightness and low price. However, since plastic products are difficult to degrade, abandoned plastic products will bring serious harm to the environment, which is commonly known as "white pollution". According to an analysis by Kearney, only 8% of the world's plastic is currently recycled, with 8 million tonnes of plastic waste entering the ocean every year. About 30% of the total global plastic use comes from packaging products, a figure that totaled 110 million tons in 2019. Plastic production is expected to grow significantly by 2050, when the figure is forecast to reach 700 million tonnes. If no countermeasures are taken, 644 million to...

Claims

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Application Information

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IPC IPC(8): B32B27/36B32B27/10B32B29/00B32B33/00B32B7/12B29C48/00B29C48/08B29D7/01C08J5/18C08L67/04C08L67/02
CPCB32B27/36B32B27/365B32B27/10B32B29/00B32B33/00B32B7/12B29D7/01B29C48/0021B29C48/08B29C48/022C08J5/18B65D65/40B32B2307/7163B32B2307/306B32B2307/558B32B2307/31C08J2367/04C08J2467/02
Inventor 顾成周伟学孙宁李斌斌
Owner JIANGSU LEATER GREEN PACKAGING CORP LTD
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