CN216373669U - Transparent high-barrier polylactic acid film - Google Patents
Transparent high-barrier polylactic acid film Download PDFInfo
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- CN216373669U CN216373669U CN202120378266.5U CN202120378266U CN216373669U CN 216373669 U CN216373669 U CN 216373669U CN 202120378266 U CN202120378266 U CN 202120378266U CN 216373669 U CN216373669 U CN 216373669U
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Abstract
The utility model discloses a transparent high-barrier polylactic acid film which sequentially consists of a surface layer, a bottom coating and a base material layer from top to bottom; the surface layer is a hydrophobic modified polyvinyl alcohol coating; the base coat is a polyurethane base coat or an acrylic base coat; the substrate layer is a three-layer co-extrusion bidirectional stretching polylactic acid film and is composed of an extinction polylactic acid layer, a polylactic acid toughening core layer and a heat-sealing polylactic acid layer from top to bottom in sequence. The polylactic acid film disclosed by the utility model has excellent toughness and oxygen barrier effect, and has the advantages of transparency and visualization while the quality of contents in a package is ensured. The polylactic acid film is suitable for packaging foods, medicines, electronic devices and the like with high barrier requirements.
Description
Technical Field
The utility model belongs to the technical field of film packaging materials, and particularly relates to a transparent high-barrier polylactic acid film.
Background
In recent years, with the gradual improvement of environmental protection consciousness and the implementation of domestic plastic restrictions, the development of biodegradable high polymer materials is increased day by day, the application range is continuously expanded, and the biodegradable high polymer materials gradually replace the traditional plastics in the fields of disposable packaging, commodity packaging and the like. As a biodegradable material, polylactic acid has become a hot spot of current research, and the variety of polylactic acid film products in the market is continuously abundant. However, polylactic acid itself has problems of high brittleness, poor toughness, poor barrier property, etc., and thus, application thereof in the field of films is limited to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, provides a transparent high-barrier polylactic acid film and solves the problems in the background art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the transparent high-barrier polylactic acid film is provided and sequentially comprises a surface layer, a bottom coating and a base material layer from top to bottom; the surface layer is a hydrophobic modified polyvinyl alcohol coating; the base coat is a polyurethane base coat or an acrylic base coat; the substrate layer is a three-layer co-extrusion bidirectional stretching polylactic acid film and is composed of an extinction polylactic acid layer, a polylactic acid toughening core layer and a heat-sealing polylactic acid layer from top to bottom in sequence.
In a preferred embodiment of the present invention, the thickness of the surface layer is 1 to 5 μm.
In a preferred embodiment of the present invention, the thickness of the primer layer is 0.5 to 3 μm.
In a preferred embodiment of the present invention, the upper surface of the matt polylactic acid layer and/or the lower surface of the heat-sealable polylactic acid layer is a corona-treated surface having a corona value of greater than 52 dynes.
In a preferred embodiment of the present invention, silica particles with a particle size of 1 to 3 μm are distributed in the extinction polylactic acid layer.
In a preferred embodiment of the present invention, the polylactic acid toughened core layer is a PLA/PBAT blend.
In a preferred embodiment of the present invention, the thickness of the substrate layer is 12 to 100 μm.
Compared with the background technology, the technical scheme has the following advantages:
1. the polylactic acid film solves the defects of polylactic acid materials, has excellent oxygen barrier effect, ensures the quality of contents in the package, and has the advantages of transparency and visualization;
2. according to the scheme, a three-layer co-extrusion bidirectional stretching polylactic acid film is used as a base material layer, wherein the extinction polylactic acid layer can endow the film with a matte decorative effect, the polylactic acid toughening core layer enables the film to have excellent toughness, and the film prepared by heat-sealing the polylactic acid layer can be directly heat-sealed; and the three polylactic acid film layers are compounded by co-extrusion and biaxial stretching, so that an adhesive is not needed, the production efficiency is high, and the environment is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a transparent high-barrier polylactic acid film.
The coating comprises a substrate layer, a surface layer, a polyvinyl alcohol coating layer, a bottom coating layer, a substrate layer, a three-layer co-extrusion bidirectional stretching polylactic acid substrate layer, a 4-extinction polylactic acid layer, a 5-polylactic acid toughening core layer and a 6-heat-sealable polylactic acid layer.
Detailed Description
In the description of the present invention, the terms "upper" and "lower" are used in an orientation or positional relationship shown in the drawings only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
The structure of the transparent high-barrier polylactic acid film of the embodiment is shown in fig. 1, and the transparent high-barrier polylactic acid film sequentially comprises a surface layer 1, a bottom coating layer 2 and a substrate layer 3 from top to bottom;
the substrate layer 3 is a three-layer co-extrusion two-way stretching polylactic acid film, and the total thickness is 12-100 mu m. The substrate layer is composed of a delustering polylactic acid layer 4, a polylactic acid toughening core layer 5 and a heat-sealable polylactic acid layer 6 from top to bottom in sequence. The upper surface of the extinction polylactic acid layer 4 is a corona treatment surface, and the corona value is greater than 52 dyne; the bottom coating 2 is formed by coating a polyurethane bottom coating agent on the corona treatment surface of the extinction polylactic acid layer 4, and the thickness of the bottom coating is 0.5-3 mu m; and coating a hydrophobic modified polyvinyl alcohol coating on the upper surface of the bottom coating 2 to form the surface layer 1, wherein the thickness of the surface layer 1 is selected to be 1-5 μm.
The extinction polylactic acid layer 4 is filled with an inorganic extinction agent, in the embodiment, silicon dioxide is adopted, and the particle size is 1-3 μm; the polylactic acid toughening core layer 5 is a PLA/PBAT mixture; the heat-sealable polylactic acid layer 6 is a common material in the prior art, and the publication number adopted in this example is CN104608448A, a blend of crystalline PLA and non-crystalline PLA in "a directly heat-sealable biaxially oriented polylactic acid film and a preparation method thereof"; the upper surface layer 4 of the extinction polylactic acid layer, the polylactic acid toughening core layer 5 and the heat-sealable polylactic acid layer 6 are prepared by a three-layer co-extrusion biaxial stretching method, so that the use of an adhesive is effectively avoided, and the production is efficient and environment-friendly.
Example 2
This example differs from example 1 in that: the primer layer 2 is an acrylic primer layer.
The transparent high-barrier polylactic acid film with the structure has excellent toughness and oxygen barrier effect, and has the advantages of transparency and visualization while ensuring the quality of contents in a package. The packaging method is suitable for packaging foods, medicines, electronic devices and the like with high barrier requirements.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A transparent high-barrier polylactic acid film is characterized in that: the coating sequentially consists of a surface layer, a bottom coating and a base material layer from top to bottom; the surface layer is a hydrophobic modified polyvinyl alcohol coating; the base coat is a polyurethane base coat or an acrylic base coat; the substrate layer is three-layer coextrusion bidirectional stretching polylactic acid film, comprises extinction polylactic acid layer, polylactic acid toughening core layer and heat-sealing polylactic acid layer from top to bottom in proper order, wherein polylactic acid toughening core layer is PLA/PBAT mixture.
2. The transparent high-barrier polylactic acid film according to claim 1, wherein: the thickness of the surface layer is 1-5 μm.
3. The transparent high-barrier polylactic acid film according to claim 1, wherein: the thickness of the bottom coating is 0.5-3 μm.
4. The transparent high-barrier polylactic acid film according to claim 1, wherein: the upper surface of the matt polylactic acid layer and/or the lower surface of the heat-sealable polylactic acid layer is a corona-treated surface with a corona value of greater than 52 dynes.
5. The transparent high-barrier polylactic acid film according to claim 1, wherein: silicon dioxide particles with the particle size of 1-3 mu m are distributed in the extinction polylactic acid layer.
6. The transparent high-barrier polylactic acid film according to claim 1, wherein: the thickness of the substrate layer is 12-100 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120378266.5U CN216373669U (en) | 2021-02-18 | 2021-02-18 | Transparent high-barrier polylactic acid film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120378266.5U CN216373669U (en) | 2021-02-18 | 2021-02-18 | Transparent high-barrier polylactic acid film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216373669U true CN216373669U (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120378266.5U Active CN216373669U (en) | 2021-02-18 | 2021-02-18 | Transparent high-barrier polylactic acid film |
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| CN (1) | CN216373669U (en) |
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2021
- 2021-02-18 CN CN202120378266.5U patent/CN216373669U/en active Active
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