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Fully-degradable high-barrier co-extrusion bag and preparation method thereof

A high-barrier, fully-degradable technology, used in chemical instruments and methods, bag making operations, flexible container manufacturing, etc. Pollution and other problems, to achieve the effect of low production cost, ensure barrier properties and puncture strength, and avoid white pollution

Active Publication Date: 2021-12-03
东莞市博晨塑料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing co-extrusion films are made of nylon and other raw materials, and their degradation ability is relatively weak. The co-extrusion bags are easy to cause white pollution after being discarded. If the co-extrusion films are produced with degradable materials, their barrier properties and puncture strength cannot meet the requirements of the industry.

Method used

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  • Fully-degradable high-barrier co-extrusion bag and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] like figure 1 As shown, a fully degradable high-barrier co-extrusion bag includes a bag body, and the bag body is made of two pieces of co-extrusion film heat-pressed and edge-sealed. The co-extrusion film includes a PLA surface layer 1, a first removable A degradable adhesive layer 2, a barrier layer 3, a second degradable adhesive layer 4 and a PLA sealing layer 5, the barrier layer 3 is a PVOH modified EVOH material layer.

[0039] The raw material of the PLA surface layer 1 and the raw material of the PLA sealing layer 5 all adopt a density of 1.24g / cm 3 , and polylactic acid with a melt index of 18g / 10min under the condition of 210°C / 2.16kg load.

[0040] The raw materials of the first degradable adhesive layer 2 and the second degradable adhesive layer 4 are made of polylactic acid, maleic anhydride modified polylactic acid and maleic anhydride grafted polyethylene in a weight ratio of 7:2.5: 1 blended.

[0041] The maleic anhydride grafted polyethylene is sele...

Embodiment 2

[0055] A fully degradable high-barrier co-extruded bag, including a bag body, the bag body is made of two co-extruded films heat-pressed and edge-sealed, and the co-extruded film includes a PLA surface layer and a first degradable adhesive layer arranged in sequence , a barrier layer, a second degradable adhesive layer and a PLA sealing layer, wherein the barrier layer is a PVOH modified EVOH material layer.

[0056] The raw material of the PLA surface layer and the raw material of the PLA sealing layer all adopt a density of 1.22g / cm 3 , and polylactic acid with a melt index of 14g / 10min under the condition of 210°C / 2.16kg load.

[0057] The raw materials of the first degradable adhesive layer and the second degradable adhesive layer are mixed by polylactic acid, maleic anhydride modified polylactic acid and maleic anhydride grafted polyethylene in a weight ratio of 7:2:1 made.

[0058] The maleic anhydride grafted polyethylene is selected from PE1040, and the polylactic ac...

Embodiment 3

[0072] A fully degradable high-barrier co-extruded bag, including a bag body, the bag body is made of two co-extruded films heat-pressed and edge-sealed, and the co-extruded film includes a PLA surface layer and a first degradable adhesive layer arranged in sequence , a barrier layer, a second degradable adhesive layer and a PLA sealing layer, wherein the barrier layer is a PVOH modified EVOH material layer.

[0073] The raw material of the PLA surface layer and the raw material of the PLA sealing layer all adopt a density of 1.25g / cm 3 , and polylactic acid with a melt index of 22g / 10min under the condition of 210°C / 2.16kg load.

[0074] The raw materials of the first degradable adhesive layer and the second degradable adhesive layer are mixed by polylactic acid, maleic anhydride modified polylactic acid and maleic anhydride grafted polyethylene in a weight ratio of 7:3:1 made.

[0075] The maleic anhydride grafted polyethylene is selected from AT2235E, and the polylactic a...

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Abstract

The invention relates to the technical field of degradable packaging bags, in particular to a fully-degradable high-barrier co-extrusion bag and a preparation method thereof. The fully-degradable high-barrier co-extrusion bag comprises a bag body, wherein the bag body is formed by hot-pressing and edge-sealing of two co-extrusion films, wherein each co-extrusion film comprises a PLA surface layer, a first degradable bonding layer, a barrier layer, a second degradable bonding layer and a PLA sealing layer which are arranged in sequence, and the barrier layer is a PVOH modified EVOH material layer. The co-extrusion films can be fully degraded, white pollution caused by discarding of the produced co-extrusion bag is avoided, the barrier property and puncture strength of the co-extrusion films can be guaranteed, and use requirements in the art are met.

Description

technical field [0001] The invention relates to the technical field of degradable packaging bags, in particular to a fully degradable high-barrier co-extruded bag and a preparation method thereof. Background technique [0002] Co-extrusion film has most of the characteristics of composite film, but there is a difference, that is, all layers of co-extrusion film are extruded together at the same time, so there will be no other non-plastic materials such as aluminum foil and paper. The combination of product materials is relatively small, and the scope of application is also small, but because the layers are bonded by hot melt without adhesives, the hygienic safety of the co-extrusion film for food packaging is relatively reliable. [0003] Most of the existing co-extrusion films are made of nylon and other raw materials, and their degradation ability is weak, and the co-extrusion bags are easy to cause white pollution after being discarded. If the co-extrusion films are produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/12B32B27/08B32B27/30B32B27/36B65D65/40B29C48/10B29C48/18B29C55/28B29D22/00B31B70/14B31B70/64B31B155/00
CPCB32B27/36B32B7/12B32B27/08B32B27/306B65D65/40B29D22/00B29C55/28B29C48/10B29C48/18B31B70/14B31B70/64B32B2439/70B32B2307/716B32B2307/50B31B2155/00Y02W90/10
Inventor 李洪河
Owner 东莞市博晨塑料科技有限公司
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