Polyethylene release film

Abstract

The utility model discloses a polyethylene release film which comprises a bending-resistant core layer which is provided with a first surface and a second surface opposite to each other along the layer thickness and comprises a metallocene linear low-density polyethylene layer and / or a low-density polyethylene layer; the wear-resistant outer layer is arranged on the first surface and comprises a homopolymerized nylon layer; the anti-static inner layer is arranged on the second surface, and a release layer is arranged on the surface, far away from the bending-resistant core layer, of the anti-static inner layer. The polyethylene release film is reasonable in structure, and the wear resistance of the wear-resistant outer layer is improved through the homopolymerized nylon layer with high crystallinity, intermolecular hydrogen bond acting force and flexible molecular chains; the bending-resistant core layer made of metallocene linear low-density polyethylene and / or low-density polyethylene is combined, so that the flexibility of the release film is improved; due to the arrangement of the anti-static inner layer, the electronic element is prevented from being damaged by electrostatic discharge, and no residue is left after the release film is easily peeled off.

Description

Technical Field

[0001] The utility model relates to the technical field of release films, in particular to a polyethylene release film. Background Art

[0002] Common release films use materials such as PET, PE, PVC, or TPU as the base film. Among them, PET base film has excellent mechanical properties and high-temperature resistance, but poor material flexibility, foldability, and poor elastic recovery performance after stretching; PVC base film has corrosion resistance, but after multiple folds, creases and fold marks will appear, and it is not suitable for use with flexible intelligent materials; TPU base film has excellent bend resistance, but is prone to discoloration and high cost; PE base film is very soft and has good flexibility, easy to bend and fold, but poor wear resistance.

[0003] Therefore, it is necessary to improve the polyethylene release film in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide a polyethylene release film. Through the homopolymer nylon layer with high crystallinity, intermolecular hydrogen bond force, and flexible molecular chains, the wear resistance of the wear-resistant outer layer is improved; combined with the bend-resistant core layer made of metallocene linear low-density polyethylene and / or low-density polyethylene, the flexibility of the release film is improved; the anti-static inner layer is provided to prevent electrostatic discharge and protect electronic components from damage, and also makes the release film easy to peel off without leaving residues.

[0005] To achieve the above technical effects, the technical solution of the utility model is: a polyethylene release film, comprising:

[0006] A bend-resistant core layer having a first surface and a second surface opposite to each other along the layer thickness, comprising a metallocene linear low-density polyethylene layer and / or a low-density polyethylene layer;

[0007] A wear-resistant outer layer provided on the first surface, comprising a homopolymer nylon layer;

[0008] An anti-static inner layer provided on the second surface, and a release layer is provided on the surface away from the bend-resistant core layer.

[0009] Preferably, a polyurethane coating is provided on the surface of the wear-resistant outer layer away from the bend-resistant core layer.

[0010] Preferably, the wear-resistant outer layer further comprises a copolymer nylon layer, the homopolymer nylon layer is connected to the polyurethane coating, and the copolymer nylon layer is close to the bend-resistant core layer.

[0011] Preferably, the bend-resistant core layer is a laminated structure of LDPE / mLLDPE, or mLLDPE / mLDPE, or LDPE / mLLDPE / LDPE, or mLLDPE / LDPE / mLLDPE.

[0012] Preferably, the bend-resistant core layer is connected to the wear-resistant outer layer through a maleic anhydride-modified polyethylene adhesive layer.

[0013] Preferably, the material of the antistatic inner layer is metallocene linear low-density polyethylene or linear low-density polyethylene.

[0014] Preferably, the release layer is one of a methyl silicone oil layer, an ethoxy silicone oil layer, an epoxy silicone oil layer, and a hydroxyl silicone oil layer.

[0015] Preferably, the layer thickness of the release layer is 1 - 2 μm, the layer thickness of the bend-resistant core layer accounts for 40% - 50% of the total film thickness of the release film, the layer thickness of the wear-resistant outer layer accounts for 25% - 30% of the total film thickness of the release film, and the layer thickness of the antistatic inner layer accounts for 25% - 30% of the total film thickness of the release film.

[0016] Preferably, the layer thickness of the polyurethane coating is 1 - 2 μm.

[0017] The advantages and beneficial effects of the present utility model are as follows:

[0018] The polyethylene release film has a reasonable structure. Through the homopolymer nylon layer with high crystallinity, intermolecular hydrogen bond force, and flexible molecular chains, the wear resistance of the wear-resistant outer layer is improved; the homopolymer nylon layer is set as the outer layer of the release film to improve the stiffness and high-temperature resistance of the release film; combined with the bend-resistant core layer made of metallocene linear low-density polyethylene and / or low-density polyethylene, the flexibility of the release film is improved; the setting of the antistatic inner layer prevents electrostatic discharge and protects electronic components from damage, and also makes the release film easily peeled off without leaving residues. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of Embodiment 1 of the polyethylene release film of the present utility model;

[0020] Figure 2 is a schematic structural diagram of Embodiment 2 of the polyethylene release film of the present utility model.

[0021] In the figure: 1, bend-resistant core layer; 2, wear-resistant outer layer; 3, antistatic inner layer; 4, maleic anhydride-modified polyethylene adhesive layer; 5, release layer; 11, metallocene linear low-density polyethylene layer; 12, low-density polyethylene layer; 21, homopolymer nylon layer; 22, copolymer nylon layer; 200, polyurethane coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will further describe the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0023] "Outer", "inner", and "core" are referenced based on the normal use state of the polyethylene release film, which is only for facilitating the description of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0024] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the creation of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0025] A polyethylene release film disclosed by the present utility model includes a bend-resistant core layer 1, a wear-resistant outer layer 2, an antistatic inner layer 3, and a release layer 5. The bend-resistant core layer 1 has a first surface (not labeled) and a second surface (not labeled) opposite to each other along the layer thickness. The wear-resistant outer layer 2 is disposed on the first surface, the antistatic inner layer 3 is disposed on the second surface, and the release layer 5 is disposed on the surface of the antistatic inner layer 3 away from the bend-resistant core layer 1; wherein, the wear-resistant outer layer 2 includes a homopolymer nylon layer 21; the bend-resistant core layer 1 includes a metallocene linear low-density polyethylene layer 11 and / or a low-density polyethylene layer 12.

[0026] Homopolymer nylon has a relatively high crystallinity, which improves the hardness and wear resistance of the wear-resistant outer layer; the hydrogen bond interaction between homopolymer nylon molecules is relatively strong, thereby improving the wear resistance of the wear-resistant outer layer; the molecular chain of homopolymer nylon is relatively flexible, dispersing external forces and reducing wear, thereby improving the wear resistance of the wear-resistant outer layer.

[0027] Through the homopolymer nylon layer 21 with high crystallinity, intermolecular hydrogen bond force, and flexible molecular chain, the wear resistance of the wear-resistant outer layer 2 is improved; the homopolymer nylon layer 21 is set as the outer layer of the release film to improve the stiffness and high-temperature resistance of the release film; combined with the bend-resistant core layer 1 made of metallocene linear low-density polyethylene and / or low-density polyethylene material, the flexibility of the release film is improved; the setting of the antistatic inner layer 3 effectively prevents electrostatic discharge and protects electronic components from damage, and also enables the release film to be easily peeled off without leaving residues.

[0028] In some embodiments, the bend-resistant core layer 1 is a laminated structure of LDPE / mLLDPE.

[0029] In some embodiments, the bend-resistant core layer 1 has a laminated structure of mLLDPE / mLDPE.

[0030] In some embodiments, the bend-resistant core layer 1 has a laminated structure of LDPE / mLLDPE / LDPE.

[0031] In some embodiments, the bend-resistant core layer 1 has a laminated structure of mLLDPE / LDPE / mLLDPE.

[0032] In order to further improve the bend resistance and abrasion resistance of the polyethylene release film, a polyurethane coating 200 is provided on the surface of the wear-resistant outer layer 2 away from the bend-resistant core layer 1.

[0033] Furthermore, the wear-resistant outer layer 2 further includes a copolyamide layer 22. The homopolyamide layer 21 is connected to the polyurethane coating 200, and the copolyamide layer 22 is close to the bend-resistant core layer 1. The copolyamide layer 22 has good dimensional stability and water resistance, which improves the barrier property of the release film. Combining with the homopolyamide layer 21 improves the toughness of the release film.

[0034] The bend-resistant core layer 1 is connected to the wear-resistant outer layer 2 through a maleic anhydride-modified polyethylene adhesive layer 4. Further, the raw materials of the maleic anhydride-modified polyethylene adhesive layer 4 are maleic acid-modified linear low-density polyethylene and metallocene linear low-density polyethylene with a mass ratio of 1:1. It not only improves the connection firmness between nylon and polyethylene, but also improves the mechanical properties and toughness of the release film.

[0035] The material of the antistatic inner layer 3 is metallocene linear low-density polyethylene or linear low-density polyethylene. LLDPE has higher strength, toughness, rigidity, tear resistance and environmental stress cracking resistance; using mLLDPE material will increase the mechanical properties, flexibility, impact strength and film-forming property of the protective film.

[0036] The release layer 5 is one of a methyl silicone oil layer, an ethoxy silicone oil layer, an epoxy silicone oil layer and a hydroxyl silicone oil layer. The methyl silicone oil layer has good lubricity, heat resistance and chemical stability; the ethoxy silicone oil layer has good water solubility and wettability, which improves the hydrophilicity of the release layer and the leveling property of the release layer coating liquid; the epoxy silicone oil layer has reactivity, which improves the adhesion between the release layer and the antistatic inner layer and the chemical resistance of the release film; the hydroxyl silicone oil layer has high reactivity, which improves the adhesion between the release layer and the antistatic inner layer and the wettability of the release layer.

[0037] Among them, the total film thickness of the release film is 50~100μm, the layer thickness of the release layer 5 is 1~2μm, the layer thickness of the polyurethane coating 200 is 1~2μm, the layer thickness of the bend-resistant core layer 1 accounts for 40%~50% of the total film thickness of the release film, the layer thickness of the wear-resistant outer layer 2 accounts for 25%~30% of the total film thickness of the release film, and the layer thickness of the antistatic inner layer 3 accounts for 25%~30% of the total film thickness of the release film.

[0038] Example 1

[0039] As Figure 1 shown, the polyethylene release film of Example 1 includes a bend-resistant core layer 1, a wear-resistant outer layer 2, an antistatic inner layer 3, and a release layer 5, which is a five-layer coextruded film. The bend-resistant core layer 1 has a first surface (not labeled) and a second surface (not labeled) opposite to each other along the layer thickness. The wear-resistant outer layer 2 is disposed on the first surface, the antistatic inner layer 3 is disposed on the second surface, the release layer 5 is disposed on the surface of the antistatic inner layer 3 away from the bend-resistant core layer 1, and a polyurethane coating 200 is disposed on the surface of the wear-resistant outer layer 2 away from the bend-resistant core layer 1. Among them, the wear-resistant outer layer 2 includes a homopolymer nylon layer 21; the bend-resistant core layer 1 includes a metallocene linear low-density polyethylene layer 11, and the bend-resistant core layer 1 is a laminated structure of mLLDPE / mLDPE. The bend-resistant core layer 1 is connected to the wear-resistant outer layer 2 through a maleic anhydride-modified polyethylene adhesive layer 4.

[0040] Example 2

[0041] As Figure 2 shown, Example 2 is based on Example 1, the difference is that the base film of the polyethylene release film is a seven-layer coextruded film, the wear-resistant outer layer 2 further includes a copolymer nylon layer 22, the homopolymer nylon layer 21 is connected to the polyurethane coating 200, the copolymer nylon layer 22 is close to the bend-resistant core layer 1, and the bend-resistant core layer 1 is a laminated structure of mLLDPE / LDPE / mLLDPE.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A polyethylene release film, characterized in that, Comprising: A bend-resistant core layer having a first surface and a second surface opposite to each other along the layer thickness, including a metallocene linear low-density polyethylene layer and / or a low-density polyethylene layer; A wear-resistant outer layer disposed on the first surface, including a homopolymer nylon layer; An antistatic inner layer disposed on the second surface, and a release layer is provided on the surface away from the bend-resistant core layer.

2. The polyethylene release film according to claim 1, wherein, A polyurethane coating is provided on the surface of the wear-resistant outer layer away from the bend-resistant core layer.

3. The polyethylene release film according to claim 2, wherein The wear-resistant outer layer further includes a copolymer nylon layer. The homopolymer nylon layer is connected to the polyurethane coating, and the copolymer nylon layer is close to the bend-resistant core layer.

4. The polyethylene release film according to claim 1, characterized in that, The bend-resistant core layer is a laminated structure of LDPE / mLLDPE, or mLLDPE / mLDPE, or LDPE / mLLDPE / LDPE, or mLLDPE / LDPE / mLLDPE.

5. The polyethylene release film according to claim 3 or 4, characterized in that, The bend-resistant core layer is connected to the wear-resistant outer layer through a maleic anhydride-modified polyethylene adhesive layer.

6. The polyethylene release film according to claim 1, characterized in that, The material of the antistatic inner layer is metallocene linear low-density polyethylene or linear low-density polyethylene.

7. The polyethylene release film according to claim 1, wherein The release layer is one of a methyl silicone oil layer, an ethoxy silicone oil layer, an epoxy silicone oil layer, and a hydroxy silicone oil layer.

8. The polyethylene release film according to claim 7, wherein, The layer thickness of the release layer is 1-2 μm. The layer thickness of the bend-resistant core layer accounts for 40%-50% of the total film thickness of the release film. The layer thickness of the wear-resistant outer layer accounts for 25%-30% of the total film thickness of the release film. The layer thickness of the antistatic inner layer accounts for 25%-30% of the total film thickness of the release film.

9. The polyethylene release film according to claim 2, wherein, The layer thickness of the polyurethane coating is 1-2 μm.

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