Low-viscosity easy-to-tear polyethylene protective film

Abstract

The utility model discloses a low-viscosity easy-to-tear polyethylene protective film, which comprises a high-temperature-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 high-density polyethylene layer and a polypropylene layer; the antifouling surface layer is arranged on the first surface; the toughening surface layer is arranged on the second surface; and the low adhesive layer is arranged on the surface, far away from the high-temperature-resistant core layer, of the toughening surface layer. The low-viscosity and easy-to-tear polyethylene protective film is reasonable in structure, the high-temperature-resistant core layer formed by combining the high-density polyethylene layer and the polypropylene layer ensures the structural stability and shape retention capacity of the protective film under the high-temperature condition, the protective film can bear the high temperature without melting or deformation, the anti-cracking capacity of the protective film is improved, the service life is prolonged, and the service life is prolonged. The stiffness of the polyethylene protective film is also improved; the combined toughening surface layer is suitable for objects with irregular or curved surfaces; due to the arrangement of the antifouling surface layer, the cleanliness of the surface is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of protective films, in particular to a low-adhesion and easy-to-tear polyethylene protective film. Background Art

[0002] The main function of the protective film is to protect the material during transportation, storage and processing, prevent the surface of the object from being scratched or contaminated during the processing, and after use, the protective film is required to be completely torn off without residue. During the processing, it is often necessary to heat the object at a high temperature. Therefore, the high-temperature resistance performance of the protective film is required.

[0003] The existing low-adhesion and easy-to-tear protective films have the following defects: poor mechanical strength, and partial fracture or deformation are likely to occur during tearing; poor high-temperature resistance, delamination and deformation.

[0004] Therefore, it is necessary to improve the protective film in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the defects existing in the prior art, and provide a low-adhesion and easy-to-tear polyethylene protective film. The high-temperature resistant core layer composed of a high-density polyethylene layer and a polypropylene layer ensures the structural stability and shape retention ability of the protective film under high-temperature conditions. It can withstand high temperatures without melting or deforming, improve the anti-rupture ability of the protective film, extend the service life, and also improve the stiffness of the polyethylene protective film; the toughened surface layer is combined to be suitable for objects with irregular or curved surfaces; due to the setting of the anti-fouling surface layer, the cleanliness of the surface is maintained.

[0006] To achieve the above technical effects, the technical solution of the utility model is: a low-adhesion and easy-to-tear polyethylene protective film, comprising:

[0007] A high-temperature resistant core layer, having a first surface and a second surface opposite to each other along the layer thickness, comprising a high-density polyethylene layer and a polypropylene layer;

[0008] An anti-fouling surface layer, disposed on the first surface;

[0009] A toughened surface layer, disposed on the second surface;

[0010] A low-adhesion adhesive layer, disposed on the surface of the toughened surface layer away from the high-temperature resistant core layer.

[0011] The preferred technical solution is that the high-temperature resistant core layer is a laminated structure of HDPE / PP / HDPE, or PP / HDPE / PP, or PP / PP / HDPE / HDPE, or HDPE / PP / PP / HDPE, or PP / HDPE / HDPE / PP.

[0012] The preferred technical solution is that the anti-fouling surface layer is a metallocene linear low-density polyethylene layer.

[0013] Preferably, the toughened surface layer is a low-density polyethylene layer or a composite of a low-density polyethylene layer and a linear low-density polyethylene layer.

[0014] Preferably, the low-adhesion adhesive layer is a high-temperature resistant acrylic adhesive layer.

[0015] Preferably, the total film thickness of the anti-fouling surface layer, the high-temperature resistant core layer and the toughened surface layer is 40-60 μm, and the layer thickness ratio of the anti-fouling surface layer, the high-temperature resistant core layer and the toughened surface layer is (1-2):(2-3):(1-2).

[0016] Preferably, the layer thickness of the low-adhesion adhesive layer is 12-20 μm.

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

[0018] The structure of the low-adhesion and easy-to-tear polyethylene protective film is reasonable. The high-temperature resistant core layer composed of a high-density polyethylene layer and a polypropylene layer ensures the structural stability and shape retention ability of the protective film under high-temperature conditions. It can withstand high temperatures without melting or deforming, improve the anti-rupture ability of the protective film, extend the service life, and also improve the stiffness of the polyethylene protective film; the toughened surface layer is suitable for objects with irregular or curved surfaces; due to the setting of the anti-fouling surface layer, the surface cleanliness is maintained. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of Embodiment 1 of the low-adhesion and easy-to-tear polyethylene protective film of the present utility model;

[0020] Figure 2 is a schematic structural diagram of Embodiment 2 of the low-adhesion and easy-to-tear polyethylene protective film of the present utility model.

[0021] In the figure: 1, high-temperature resistant core layer; 2, anti-fouling surface layer; 3, toughened surface layer; 4, low-adhesion adhesive layer; 11, polypropylene layer; 12, high-density polyethylene layer; 31, low-density polyethylene layer; 32, linear low-density polyethylene layer. Detailed Embodiments

[0022] The following combines the drawings and embodiments to further describe the specific embodiments of the present utility model. 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] "Surface" and "core layer" are referenced based on the normal use state of the low-adhesion and easy-to-tear polyethylene protective film, which is only for the convenience of describing 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 therefore cannot be understood as a limitation to the present utility model.

[0024] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and should not 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 present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0025] As Figures 1 - 2 shown, the present utility model creates a low-viscosity and easy-to-tear polyethylene protective film, which includes a high-temperature resistant core layer 1, an anti-fouling surface layer 2, and a toughening surface layer 3. The high-temperature resistant core layer 1 has a first surface (not marked) and a second surface (not marked) opposite to each other along the layer thickness, and includes a high-density polyethylene layer 12 and a polypropylene layer 11; the anti-fouling surface layer 2 is disposed on the first surface; the toughening surface layer 3 is disposed on the second surface; the low-viscosity adhesive layer 4 is disposed on the surface of the toughening surface layer 3 away from the high-temperature resistant core layer 1.

[0026] The high-temperature resistant core layer 1 combined by the high-density polyethylene layer 12 and the polypropylene layer 11 ensures the structural stability and shape retention ability of the protective film under high-temperature conditions. It can withstand high temperatures without melting or deforming, improve the anti-rupture ability of the protective film, extend the service life, and also improve the stiffness of the polyethylene protective film; due to the setting of the anti-fouling surface layer 2, the surface cleanliness is maintained.

[0027] In some embodiments, the high-temperature resistant core layer 1 is a laminated structure of HDPE / PP / HDPE.

[0028] In some embodiments, the high-temperature resistant core layer 1 is a laminated structure of PP / HDPE / PP.

[0029] In some embodiments, the high-temperature resistant core layer 1 is a laminated structure of PP / PP / HDPE / HDPE.

[0030] In some embodiments, the high-temperature resistant core layer 1 is a laminated structure of HDPE / PP / PP / HDPE.

[0031] In some embodiments, the high-temperature resistant core layer 1 is a laminated structure of PP / HDPE / HDPE / PP

[0032] PP has a relatively high melting point and better heat resistance, and is suitable for applications requiring relatively high temperature stability; HDPE has good heat resistance, dimensional stability, and high mechanical strength.

[0033] The anti-fouling surface layer 2 is a metallocene linear low-density polyethylene layer. When metallocene linear low-density polyethylene (mLLDPE) is used as the surface layer of the protective film, it can not only provide anti-fouling performance, but also enhance the transparency, processing performance, mechanical properties, environmental stress cracking resistance, dimensional stability, and chemical resistance of the protective film, etc., and also improve the toughness of the protective film.

[0034] In some embodiments, the toughened surface layer 3 is a low-density polyethylene layer 31. In some embodiments, the toughened surface layer 3 is a composite of a low-density polyethylene layer 31 and a linear low-density polyethylene layer 32. Among them, the low-density polyethylene layer 31 is for improving the softness and transparency of the protective film, so it is suitable for protecting the irregular or curved surfaces of objects; the linear low-density polyethylene layer 32 is for further improving the tear resistance, puncture resistance, and environmental stress cracking resistance of the protective film.

[0035] The low-tack adhesive layer 4 is a high-temperature resistant acrylic adhesive layer. It is prepared by polymerizing and modifying by selecting high-temperature resistant monomers and other soft and hard monomers. It prevents the protective film from having residual glue on the surface of the object under high-temperature conditions.

[0036] Among them, the total film thickness of the anti-fouling surface layer 2, the high-temperature resistant core layer 1, and the toughened surface layer 3 is 40 - 60 μm, and the layer thickness ratio of the anti-fouling surface layer 2, the high-temperature resistant core layer 1, and the toughened surface layer 3 is (1 - 2):(2 - 3):(1 - 2). The layer thickness of the low-tack adhesive layer 4 is 12 - 20 μm.

[0037] Example 1

[0038] As Figure 1 shown, the low-tack and easy-tear polyethylene protective film of Example 1 is a five-layer co-extruded film, including a high-temperature resistant core layer 1, an anti-fouling surface layer 2, a toughened surface layer 3, and a low-tack adhesive layer 4. The high-temperature resistant core layer 1 has a first surface (not marked) and a second surface (not marked) opposite along the layer thickness; the anti-fouling surface layer 2 is disposed on the first surface; the toughened surface layer 3 is disposed on the second surface; the low-tack adhesive layer 4 is disposed on the surface of the toughened surface layer 3 away from the high-temperature resistant core layer 1. Among them, the high-temperature resistant core layer 1 is a laminated structure of PP / HDPE / PP, and the toughened surface layer 3 is a low-density polyethylene layer 31.

[0039] Example 2

[0040] As Figure 2 shown, Example 2 is based on Example 1, and the difference is that the protective film is a seven-layer co-extruded film. Among them, the high-temperature resistant core layer 1 is a laminated structure of PP / HDPE / HDPE / PP, and the toughened surface layer 3 is a composite of a low-density polyethylene layer 31 and a linear low-density polyethylene layer 32.

[0041] The high-temperature resistant core layers 1 of both Example 1 and Example 2 adopt a symmetric structure to improve processing stability and structural stability. The mechanical properties of Example 2 are better than those of Example 1.

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

Claims

1. A low-viscosity and easy-to-tear polyethylene protective film, characterized in that, Comprising: A high-temperature resistant core layer having a first surface and a second surface opposite to each other along the layer thickness, comprising a high-density polyethylene layer and a polypropylene layer; An anti-fouling surface layer disposed on the first surface; A toughened surface layer disposed on the second surface; A low-viscosity adhesive layer disposed on the surface of the toughened surface layer away from the high-temperature resistant core layer.

2. The low-viscosity and easy-to-tear polyethylene protective film according to claim 1, wherein The high-temperature resistant core layer is a laminated structure of HDPE / PP / HDPE, or PP / HDPE / PP, or PP / PP / HDPE / HDPE, or HDPE / PP / PP / HDPE, or PP / HDPE / HDPE / PP.

3. The low-viscosity and easy-to-tear polyethylene protective film according to claim 1 or 2, characterized in that The anti-fouling surface layer is a metallocene linear low-density polyethylene layer.

4. The low-viscosity and easy-to-tear polyethylene protective film according to claim 1 or 2, characterized in that, The toughened surface layer is a low-density polyethylene layer, or a composite of a low-density polyethylene layer and a linear low-density polyethylene layer.

5. The low-viscosity and easy-to-tear polyethylene protective film according to claim 1, wherein The low-viscosity adhesive layer is a high-temperature resistant acrylic adhesive layer.

6. The low-viscosity and easy-to-tear polyethylene protective film according to claim 1, wherein The total film thickness of the anti-fouling surface layer, the high-temperature resistant core layer and the toughened surface layer is 40-60 μm, and the layer thickness ratio of the anti-fouling surface layer, the high-temperature resistant core layer and the toughened surface layer is (1-2):(2-3):(1-2).

7. The low-viscosity and easily tearable polyethylene protective film according to claim 1 or 6, characterized in that, The layer thickness of the low-viscosity adhesive layer is 12-20 μm.

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