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Biaxial drawing polylactic acid compound film with barrier property and preparation method thereof

A composite film, biaxial stretching technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of lack of biodegradability, poor barrier properties of polylactic acid, poor mechanical properties of films, etc. , to achieve the effect of preventing white pollution, uniform thickness and high thickness accuracy

Active Publication Date: 2012-06-20
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Many traditional packaging films (such as PP, PE, PVC, PET) have good heat sealing properties, printing properties, metallization properties, gas barrier properties and controllable coefficient of friction, but these materials are not biodegradable ,polluted environment
[0003] With the development of fully biodegradable materials, biodegradable materials are gradually applied to packaging films, such as polylactic acid film (BOPLA film), but polylactic acid itself has poor barrier properties and cannot be used alone as a barrier material
[0004] Chinese patent 200980108671.7 discloses a biodegradable composite oxygen barrier film, which is composed of at least two support layers and a barrier layer arranged between each two support layers. Long shelf life, shelf life; at the same time, it can prevent white pollution, but it is prepared by multi-layer co-extrusion method, the mechanical properties of the film are poor, and the scope of use is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A barrier biaxially stretched polylactic acid composite film, comprising two polylactic acid layers and a barrier layer located in the middle of the two polylactic acid layers, the total film thickness is 40 μm, the polylactic acid layer thickness is 15 μm, and the barrier layer thickness is 10 μm. Each layer of the film includes the following components by weight percentage, two polylactic acid layers: 85% crystalline polylactic acid, 3% melt reinforcing agent, 2% toughening agent, 2% antistatic agent, 2% antioxidant, cool 3% slip agent, 3% anti-blocking agent; Barrier layer: 100% polypropylene carbonate inorganic modification.

[0042] The preparation method of this polylactic acid composite film comprises the following steps:

[0043] Place the three-layer ingredients that have been dried on-line in the hoppers of the corresponding three extruders respectively, and set the appropriate temperature (the setting temperature of polylactic acid should not exceed 230°C, a...

Embodiment 2

[0049] A barrier biaxially stretched polylactic acid composite film, including a four-layer structure, sequentially composed of heat-sealing layer, polylactic acid layer, barrier layer and polylactic acid layer, the total film thickness is 50 μm, the heat-sealing layer is 3 μm, poly The lactic acid layer is 18 μm and the barrier layer is 11 μm. Each layer of the film includes the following components by weight percentage, two polylactic acid layers: 86% crystalline polylactic acid, 2% melt reinforcement, 3% toughening agent, 2% antistatic agent, 3% antioxidant, cool 1% slip agent, 3% anti-adhesive agent; barrier layer: 100% inorganic modified polypropylene carbonate; heat-sealing layer: 95% non-crystalline polylactic acid, 3% anti-adhesive agent, 2% antioxidant.

[0050] Compared with Example 1, the preparation method of the polylactic acid composite film is the same as Example 1 except that one more extruder is used for melting and plasticizing the extra heat-sealing layer in...

Embodiment 3

[0053] A barrier biaxially stretched polylactic acid composite film includes a five-layer structure, which is sequentially composed of a heat-sealing layer, a polylactic acid layer, a barrier layer, a metal receiving layer and an aluminum plating layer. The total film thickness is 60 μm, the heat seal layer is 3 μm, the outer layer is 35 μm, the barrier layer is 20 μm, and the metal receiving layer is 2 μm. Each layer of the film includes the following components by weight percentage, the outer layer: crystalline polylactic acid 75%, melt reinforcement 5%, toughening agent 5%, antistatic 4%, antioxidant 4%, slip agent 3% , anti-blocking agent 4%; barrier layer: polypropylene carbonate inorganic modification 100%; heat-sealing layer: non-crystalline polylactic acid 96%, anti-adhesive agent 2%, antioxidant 2%; metal receiving layer : Non-crystalline polylactic acid 95%, anti-adhesive agent 3%, antioxidant 2%.

[0054] The preparation method of this polylactic acid composite fil...

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Abstract

The invention discloses a biaxial drawing polylactic acid compound film with a barrier property and a preparation method thereof. The compound film comprises two polylactic acid layers and a barrier layer arranged between the two polylactic acid layers, wherein each polylactic acid layer comprises the following components in weight percentage: 75-100 percent of crystalline polylactic acid, 0-5 percent of melt reinforcing agent, 0-5 percent of toughening agent, 0-5 percent of antistatic agent, 0-5 percent of antioxygen, 0-5 percent of slipping agent and 0-5 percent of antiblocking agent, and the barrier layer is fully biodegradable and is provided with a carbon dioxide copolymer with the gas barrier property. According to the preparation method, a multilayer co-extrusion gradual or synchronous biaxial drawing process is adopted. The compound film can be fully biodegradable, has very good oxygen, carbon dioxide and moisture barrier property, higher tensile strength, high puncture resistance and high deflection, and can be used for packages of foods, cosmetics, electronic products, chemicals and the like.

Description

technical field [0001] The invention relates to a barrier biaxially stretched polylactic acid composite film and a preparation method thereof. Background technique [0002] Many traditional packaging films (such as PP, PE, PVC, PET) have good heat sealing properties, printing properties, metallization properties, gas barrier properties and controllable coefficient of friction, but these materials are not biodegradable ,polluted environment. [0003] With the development of fully biodegradable materials, biodegradable materials are gradually applied to packaging films, such as polylactic acid film (BOPLA film), but polylactic acid itself has poor barrier properties and cannot be used alone as a barrier material. [0004] Chinese patent 200980108671.7 discloses a biodegradable composite oxygen barrier film, which is composed of at least two support layers and a barrier layer arranged between each two support layers. At the same time, it can prevent white pollution, but it is...

Claims

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Application Information

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IPC IPC(8): B32B27/36B32B27/18C08L67/04B29C69/00B29C55/14B29C47/00B29C71/02B29C71/04
Inventor 张广强仇植
Owner FSPG HI TECH
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