Biodegradable barrier film and packaging material

Abstract

The utility model discloses a biodegradable barrier film and a packaging material comprising the biodegradable barrier film. The biodegradable barrier film comprises a base material layer, a bonding layer and a barrier layer which are sequentially arranged, the base material layer comprises a supporting layer and at least one printing layer, the barrier layer comprises a heat sealing layer and a high barrier layer, and the high barrier layer is arranged between the bonding layer and the heat sealing layer; the supporting layer is paper or polyhydroxyalkanoate (PHA), the high-barrier layer is an aluminum-plated layer, an aluminum oxide-plated layer or a silicon oxide layer, and the heat sealing layer is biaxially oriented polyhydroxyalkanoate (BOPHA). The biodegradable barrier film has high barrier performance and can meet the requirements of food packaging materials, and meanwhile, due to the fact that the base material layer and the heat sealing layer can be degraded, pollution to the environment is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of film packaging, and in particular relates to a biodegradable barrier film and packaging material. Background Art

[0002] Food packaging usually requires that the packaging film has good oxygen barrier and waterproof properties to prevent the packaged food from oxidation and moisture, which may lead to food corruption. Polypropylene (PP) and polyethylene (PE) have good waterproof and heat-sealing properties, polyamide (PA) has good oxygen barrier and flexibility, polyethylene terephthalate (PET) has good stiffness and printability, and aluminum foil (AL) has excellent oxygen and water barrier properties. In existing food packaging, several materials are often used in combination to meet the performance requirements of food packaging, such as PA / AL / PE composite film, which makes the composite packaging material have excellent barrier properties, heat sealing properties and puncture resistance. However, these traditional composite food packaging do not have degradability, and due to the differences in the properties of various materials, it is difficult to recycle and reuse, which will cause great white pollution to the environment.

[0003] According to the currently available public information, the applicable degradable packaging materials still have some defects. For example, the barrier properties of PLA film are poor and require industrial composting for degradation; another example is that the application of PBAT film is limited due to its poor mechanical and optical properties.

[0004] In summary, it is necessary to develop a packaging film that is environmentally friendly and has excellent barrier properties to simultaneously meet the increasingly stringent environmental requirements and the use needs of food packaging. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a biodegradable barrier film and packaging material, which solves the problems of poor barrier performance and environmental pollution of the film mentioned in the above background technology. The technical solution of the utility model is as follows:

[0006] A biodegradable barrier film comprises a substrate layer, an adhesive layer and a barrier layer arranged in sequence;

[0007] The substrate layer includes a support layer and at least one printing layer, the barrier layer includes a heat-sealing layer and a high-barrier layer, and the high-barrier layer is arranged between the adhesive layer and the heat-sealing layer;

[0008] The support layer is paper or polyhydroxyalkanoate (PHA), the high barrier layer is an aluminum-plated layer, an aluminum oxide-plated layer or a silicon oxide layer, and the heat sealing layer is biaxially oriented polyhydroxyalkanoate (BOPHA).

[0009] The support layer of the above-mentioned biodegradable barrier film is paper or polyhydroxyalkanoate (PHA), which can provide good hand feel and mechanical support. The barrier layer can provide excellent oxygen and water barrier properties, which meets the needs of high-barrier food packaging. At the same time, the heat-sealing layer can also improve the packaging performance of the biodegradable barrier film. In addition, the substrate layer and the heat-sealing barrier layer can be biodegraded, and the high-barrier layer can be processed and recycled, which has less pollution to the environment.

[0010] In some preferred embodiments of the present application, the melting point of the heat-sealable polyhydroxyalkanoate (PHA) is 110°C-140°C.

[0011] In some preferred embodiments of the present application, the thickness of the biaxially oriented polyhydroxyalkanoate (BOPHA) layer is 10 μm-160 μm.

[0012] In some preferred embodiments of the present application, the thickness of the support layer is 10 μm-160 μm.

[0013] In some preferred embodiments of the present application, the thickness of the high barrier layer is At the above thickness, the high barrier layer can achieve good barrier properties with low cost.

[0014] In some preferred embodiments of the present application, the adhesive layer is a degradable glue.

[0015] In some preferred embodiments of the present application, the thickness of the adhesive layer is 0.1 μm-2 μm.

[0016] In some preferred embodiments of the present application, the printing layer is disposed between the support layer and the adhesive layer, or the printing layer is disposed on a side of the substrate layer away from the adhesive layer.

[0017] In some preferred embodiments of the present application, the thickness of the printing layer is 0.1 μm-2 μm.

[0018] A packaging material comprises the above-mentioned biodegradable barrier film.

[0019] This technical solution has the following beneficial effects:

[0020] 1. This solution provides a biodegradable barrier film. The heat seal layer provides the biodegradable barrier film with good oxygen and water barrier properties, and the oxygen transmission rate is ≤1cc / (m 2 *day), can meet most food packaging needs, the support layer can provide good feel and mechanical support, at the same time, the substrate layer and heat-sealing layer have good biocompatibility and natural degradation ability. The above biodegradable barrier film has good market application prospects in the packaging fields of food packaging, pharmaceutical packaging and electronic products.

[0021] 2. In some possible implementations, the substrate layer of the biodegradable barrier film also includes a printing layer, which provides product information and rich patterns for the film, thereby enhancing the competitive advantage of the packaging product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a layer structure diagram of the biodegradable barrier film provided in Example 1 of the present application.

[0023] The reference numerals in the figure are: 10 - substrate layer, 11 - support layer, 12 - printing layer, 20 - barrier layer, 21 - heat sealing layer, 22 - high barrier layer, 30 - adhesive layer. DETAILED DESCRIPTION

[0024] A biodegradable barrier film comprises, from bottom to top, a substrate layer 10, an adhesive layer 30 and a barrier layer 20, wherein the substrate layer 10 comprises a printing layer 12 and a support layer 11 arranged between the printing layer 12 and the adhesive layer 30, and the barrier layer 20 comprises a heat sealing layer 21 and a high barrier layer 22 arranged between the heat sealing layer 21 and the adhesive layer 30.

[0025] Specifically, the printing layer 12 has a thickness of 0.5 μm; the support layer 11 is paper with a thickness of 20 μm; the adhesive layer 30 is degradable glue with a thickness of 0.5 μm; the heat sealing layer 21 is made of biaxially oriented polyhydroxyalkanoate with a thickness of 15 μm; the high barrier layer 22 is an aluminum-plated layer with a thickness of

[0026] The oxygen transmission rate of the above biodegradable barrier film was tested, as shown in Table 1:

[0027] Table 1: Performance test of biodegradable barrier film of Example 1

[0028]

[0029] It can be seen from the above table that the oxygen permeability of the biodegradable barrier film provided in this embodiment is 1cc / (m 2 *day), has high barrier properties and can extend the shelf life of food. At the same time, the base material layer and heat-sealing layer of the product are biodegradable, which reduces the problem of "white pollution" caused by packaging materials after use and the formation of environmental hazards. It can be widely used in packaging materials for food, medicine and electronic products.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biodegradable barrier film, characterized in that: It includes a substrate layer, an adhesive layer and a barrier layer arranged in sequence; The substrate layer comprises a support layer and at least one printing layer, the barrier layer comprises a heat-sealing layer and a high-barrier layer, and the high-barrier layer is arranged between the adhesive layer and the heat-sealing layer; The support layer is paper or polyhydroxyalkanoate, the high barrier layer is an aluminum-plated layer, an aluminum oxide-plated layer or a silicon oxide layer, and the heat-sealing layer is biaxially stretched polyhydroxyalkanoate.

2. The biodegradable barrier film according to claim 1, characterized in that: The melting point of the biaxially oriented polyhydroxyalkanoate is 110°C-140°C.

3. The biodegradable barrier film according to claim 1, characterized in that: The thickness of the heat-sealing layer is 10 μm-160 μm.

4. The biodegradable barrier film according to claim 1, characterized in that: The thickness of the support layer is 10 μm-160 μm.

5. The biodegradable barrier film according to claim 1, characterized in that: The thickness of the high barrier layer is 6. The biodegradable barrier film according to claim 1, characterized in that: The adhesive layer is degradable glue.

7. The biodegradable barrier film according to claim 1 or 6, characterized in that: The thickness of the adhesive layer is 0.1 μm-2 μm.

8. The biodegradable barrier film according to claim 1, characterized in that: The printing layer is disposed between the support layer and the adhesive layer, or the printing layer is disposed on a side of the substrate layer away from the adhesive layer.

9. The biodegradable barrier film according to claim 8, characterized in that: The thickness of the printing layer is 0.1 μm-2 μm.

10. A packaging material comprising the biodegradable barrier film according to any one of claims 1 to 9.

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