Anti-static protective film for OLED (Organic Light Emitting Diode)

Abstract

The utility model discloses an anti-static protective film for an OLED (Organic Light Emitting Diode), which comprises a first substrate layer provided with a first surface and a second surface opposite to each other along the film thickness direction; the antistatic surface layer is arranged on the first surface; the first adhesive layer is arranged on the second surface; the first base material layer comprises a wear-resistant base layer and a bending-resistant base layer, and the wear-resistant base layer and the bending-resistant base layer are matched in a concave-convex mode. The anti-static protective film for the OLED is reasonable in structure, through the wear-resistant base layer and the bending-resistant base layer which are matched in a concave-convex mode, the bonding force between the layers is improved, the mechanical strength and flexibility of the composite first base material layer are improved, the bending resistance of the protective film is optimized, and the protective film is suitable for application of a folding screen; and the wear-resistant base layer also improves the durability of the protective film.

Description

Technical Field

[0001] The utility model relates to the technical field of protective films, in particular to an antistatic protective film for OLED. Background Art

[0002] Organic Light Emitting Diode (OLED) is an optoelectronic technology that uses organic semiconductor materials to produce reversible color changes under current drive to achieve colorful display. OLED has the advantages of lightness, high brightness, wide viewing angle, fast response, and flexibility. It is considered to be the most promising new generation display technology. It is widely used in display fields such as mobile phones, computers, televisions, and car displays.

[0003] OLED screen films are exposed to particles in the air during preparation, loading and unloading, and transportation. Static electricity generated by friction can easily adsorb particles to the surface of the OLED film, causing black spots or short circuits on the display. Therefore, OLED screen films need to be anti-static, free of residual glue, and have good weather resistance. The base material of existing protective films is polyethylene terephthalate (PET), which is not flexible enough and is not suitable for OLED folding screens.

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

[0005] The purpose of the utility model is to overcome the defects existing in the prior art and to provide an antistatic protective film for OLED. Through the concave-convex matched wear-resistant base layer and bending-resistant base layer, not only the bonding force between layers is improved, but also the mechanical strength and softness of the composite first substrate layer are improved, thereby optimizing the bending resistance of the protective film and making it suitable for the application of folding screens.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: an antistatic protective film for OLED, comprising:

[0007] A first substrate layer having a first surface and a second surface opposite to each other in a film thickness direction;

[0008] An antistatic surface layer is disposed on the first surface;

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

[0010] The first substrate layer comprises a wear-resistant base layer and a bending-resistant base layer, and the wear-resistant base layer and the bending-resistant base layer are matched with each other in a concave-convex manner.

[0011] A preferred technical solution is that the first substrate layer is a wear-resistant base layer / bending-resistant base layer, or a wear-resistant base layer / bending-resistant base layer / wear-resistant base layer, or a stacked structure of bending-resistant base layer / wear-resistant base layer / bending-resistant base layer.

[0012] A preferred technical solution is that the material of the wear-resistant base layer is thermoplastic polyurethane, and the material of the bending-resistant base layer is polyurethane.

[0013] A preferred technical solution is that the first adhesive layer is an antistatic adhesive, or an antistatic inner layer is provided between the first adhesive layer and the first substrate layer.

[0014] A preferred technical solution is that a hardening layer is provided between the first substrate layer and the antistatic surface layer.

[0015] A preferred technical solution is that a second substrate layer is provided on the surface of the antistatic surface layer away from the first substrate layer, and the second substrate layer includes a second adhesive layer, a supporting base layer and an antistatic coating stacked in sequence along the film thickness direction, and the second adhesive layer is connected to the antistatic surface layer.

[0016] A preferred technical solution is that an antistatic release film is provided on the surface of the first adhesive layer away from the first substrate layer.

[0017] A preferred technical solution is that the antistatic release film comprises a PET layer, the inner surface of the PET layer is connected to the release layer, and at least the inner surface of the PET layer is provided with an antistatic bottom layer.

[0018] A preferred technical solution is that the first adhesive layer is a polyurethane pressure-sensitive adhesive.

[0019] A preferred technical solution is that one surface of the first adhesive layer is connected to the first substrate layer, and the other surface is provided with a concave-convex surface.

[0020] The advantages and beneficial effects of the utility model are:

[0021] The anti-static protective film for OLED has a reasonable structure. The concave and convex wear-resistant base layer and the bending-resistant base layer not only improve the bonding strength between the layers, but also improve the mechanical strength and softness of the composite first substrate layer, thereby optimizing the bending resistance of the protective film and making it suitable for the application of folding screens; the wear-resistant base layer also improves the durability of the protective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of Embodiment 1 of the utility model antistatic protective film for OLED;

[0023] Figure 2 This is a schematic structural diagram of Embodiment 2 of the utility model antistatic protective film for OLED;

[0024] Figure 3 It is a structural schematic diagram of Example 3 of the antistatic protective film for OLED of the utility model.

[0025] In the figure: 1. first substrate layer; 2. antistatic surface layer; 3. first adhesive layer; 4. first substrate layer; 5. antistatic release film; 11. wear-resistant base layer; 12. bending-resistant base layer; 21. hardening layer; 40. supporting base layer; 41. antistatic coating; 42. second adhesive layer; 50. PET layer; 51. antistatic bottom layer; 52. release layer. DETAILED DESCRIPTION

[0026] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0027] The terms “surface”, “outside” and “inside” are based on the normal use state of the antistatic protective film for OLED and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] like Figures 1 to 3 As shown, the utility model discloses an antistatic protective film for OLED, comprising a first substrate layer 1, an antistatic surface layer 2 and a first adhesive layer 3, the first substrate layer 1 having a first surface and a second surface opposite to each other along a film thickness direction, the antistatic surface layer 2 is arranged on the first surface, the first adhesive layer 3 is arranged on the second surface, the first substrate layer 1 comprises a wear-resistant base layer 11 and a bending-resistant base layer 12, and the wear-resistant base layer 11 and the bending-resistant base layer 12 are matched with each other in a concave-convex manner.

[0030] The antistatic surface layer 2 is obtained by curing a coating liquid containing a polythiophene antistatic agent.

[0031] The material of the wear-resistant base layer 11 is thermoplastic polyurethane, and the material of the bending-resistant base layer 12 is polyurethane. Thermoplastic polyurethane (TPU) is a highly elastic synthetic rubber material with high tensile strength and tear strength; good wear resistance; good oil resistance; and can maintain its elasticity and performance at low temperatures. Polyurethane (PU) has good wear resistance, oil resistance and bending resistance. When compounded with TPU, it maintains excellent mechanical properties, weather resistance, high temperature resistance and bending resistance, and also optimizes economic costs. The concave-convex matching between the wear-resistant base layer and the bending-resistant base layer not only improves the bonding strength between the layers, but also further improves the bending resistance.

[0032] like Figure 1 As shown, in some embodiments, the first substrate layer 1 is a laminated structure of a wear-resistant base layer 11 and a bending-resistant base layer 12 , and the wear-resistant base layer 11 is close to the antistatic surface layer 2 .

[0033] like Figure 2 As shown, in some embodiments, the first substrate layer 1 is a laminated structure of wear-resistant base layer 11 / bending-resistant base layer 12 / wear-resistant base layer 11. The bending performance of the protective film can be further improved, and can reach 20,000 times without creases or cracks.

[0034] In some embodiments, the first substrate layer 1 is a stacked structure of a bending-resistant base layer 12 / a wear-resistant base layer 11 / a bending-resistant base layer 12 .

[0035] When the release film is removed, static electricity is generated due to friction, and dust and particles from the outside are easily adsorbed on the surface of the first adhesive layer, which not only affects the quality of the object to be attached, but also has a negative impact on the adhesion of the protective film. In some embodiments, the first adhesive layer 3 is an antistatic adhesive, and the first adhesive layer 3 is a polyurethane pressure-sensitive adhesive. Fluorine-containing lithium salt is added to the adhesive to improve the anti-fouling and antistatic properties of the first adhesive layer 3. In other embodiments, an antistatic inner layer (not shown) is provided between the first adhesive layer 3 and the first substrate layer 1. The antistatic inner layer is a coating containing a polythiophene antistatic agent.

[0036] like Figure 3 As shown, in some embodiments, in order to improve the hardness of the protective film, a hardening layer 21 is provided between the first substrate layer 1 and the antistatic surface layer 2 .

[0037] like Figures 1-2As shown, in other embodiments, in order to improve the hardness of the protective film, the surface of the antistatic surface layer 2 away from the first substrate layer 1 is provided with a second substrate layer 4, and the second substrate layer 4 includes a second adhesive layer 42, a supporting base layer 40 and an antistatic coating 41 stacked in sequence along the film thickness direction, and the second adhesive layer 42 is connected to the antistatic surface layer 2. The second substrate layer plays a role in improving the stiffness and support of the protective film in the preparation of OLED. When used, the second substrate layer can be peeled off, and only the first substrate layer is attached to the surface of the object to be attached to maintain the bending resistance of the protective film. In order to further improve the antistatic property of the protective film, and when the second substrate layer is bonded and separated from the first substrate layer, reduce the static electricity generated by friction, resulting in the adsorption of external particles and dust on the film surface, affecting the performance and quality of the protective film, the second adhesive layer 42 is an antistatic adhesive layer. Furthermore, the material of the second adhesive layer 42 and the first adhesive layer 3 is consistent.

[0038] The surface of the first adhesive layer 3 away from the first substrate layer 1 is provided with an antistatic release film 5, the antistatic release film 5 includes a PET layer 50, the inner surface of the PET layer 50 is connected to the release layer 52, the antistatic release film 5 is single-sided antistatic, and the inner surface of the PET layer 50 is provided with an antistatic bottom layer 51, that is, the antistatic bottom layer 51 is sandwiched between the PET layer 50 and the release layer 52; the antistatic release film 5 is double-sided antistatic, and the inner and outer surfaces of the PET layer 50 are both provided with antistatic bottom layers 51, wherein the antistatic bottom layer 51 on the inner surface of the PET layer 50 is sandwiched between the PET layer 50 and the release layer 52. The antistatic bottom layer 51 is a coating containing a polythiophene antistatic agent.

[0039] In order to improve the pasting efficiency of the first adhesive layer 3, the first adhesive layer has a venting effect to effectively prevent the occurrence of bubbles during the film pasting process, thereby improving the beauty and usability of the protective film. Furthermore, one surface of the first adhesive layer 3 is connected to the first substrate layer 1, and the other surface is provided with a concave-convex surface.

[0040] The thickness of the first substrate layer is 30-100 μm, the thickness of the antistatic surface layer is 0.3-1 μm, the thickness of the first adhesive layer is 50-100 μm, the thickness of the antistatic release film is 20-50 μm, and the thickness of the first substrate layer is 30-100 μm.

[0041] Example 1

[0042] like Figure 1As shown, the antistatic protective film for OLED includes a first substrate layer 1, an antistatic surface layer 2, a first adhesive layer 3 and a second substrate layer 4. The first substrate layer 1 has a first surface and a second surface opposite to each other along the film thickness direction. The antistatic surface layer 2 is arranged on the first surface, and the first adhesive layer 3 is arranged on the second surface. The first substrate layer 1 is a laminated structure of a wear-resistant base layer 11 / a bending-resistant base layer 12, and the wear-resistant base layer 11 and the bending-resistant base layer 12 are matched with each other in a concave-convex manner. Among them, the first adhesive layer 3 is an antistatic adhesive. An antistatic release film 5 is arranged on the surface of the first adhesive layer 3 away from the first substrate layer 1. The antistatic release film 5 includes a PET layer 50, an antistatic bottom layer 51 and a release layer 52 stacked in sequence along the film thickness direction, and the release layer 52 is connected to the first adhesive layer 3.

[0043] The second substrate layer 4 includes a second adhesive layer 42 , a supporting base layer 40 and an antistatic coating layer 41 stacked in sequence along the film thickness direction, and the second adhesive layer 42 is connected to the antistatic surface layer 2 .

[0044] Example 2

[0045] like Figure 2 As shown, Example 2 is based on Example 1, with the difference that the first substrate layer 1 is a stacked structure of wear-resistant base layer 11 / bending-resistant base layer 12 / wear-resistant base layer 11.

[0046] Example 3

[0047] like Figure 3 As shown, Example 3 is based on Example 1, except that a hardening layer 21 is provided between the first substrate layer 1 and the antistatic surface layer 2, and the second substrate layer 4 is not included.

[0048] Example protective film performance test:

[0049] 1. Pencil hardness tester YASDA, load 1000g;

[0050] 2. Antistatic property: surface resistivity meter Trek model 152-1;

[0051] 3. Wear resistance: abrasion resistance tester Airma;

[0052] 4. Transmissometer and haze meter: NDH 5000.

[0053] 5. External bending: With the hardened coating facing outwards, the diameter is 3mm, and the bending angle is 180°. Bend it 100,000 times to observe whether there are creases. Internal bending: With the hardened coating facing inwards, the diameter is 1.5mm, and the bending angle is 180°. Bend it 100,000 times to observe whether there are creases. Remove the second substrate layer for measurement.

[0054] The test results of the embodiment are as follows:

[0055]

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An antistatic protective film for OLED, comprising: A first substrate layer having a first surface and a second surface opposite to each other in a film thickness direction; An antistatic surface layer is disposed on the first surface; A first adhesive layer, disposed on the second surface; The invention is characterized in that the first substrate layer comprises a wear-resistant base layer and a bending-resistant base layer, and the wear-resistant base layer and the bending-resistant base layer are matched with each other in a concave-convex manner.

2. The antistatic protective film for OLED according to claim 1, characterized in that: The first substrate layer is a wear-resistant base layer / bending-resistant base layer, or a wear-resistant base layer / bending-resistant base layer / wear-resistant base layer, or a stacked structure of bending-resistant base layer / wear-resistant base layer / bending-resistant base layer.

3. The antistatic protective film for OLED according to claim 1 or 2, characterized in that: The material of the wear-resistant base layer is thermoplastic polyurethane, and the material of the bending-resistant base layer is polyurethane.

4. The antistatic protective film for OLED according to claim 1, characterized in that: The first adhesive layer is an antistatic adhesive, or an antistatic inner layer is arranged between the first adhesive layer and the first substrate layer.

5. The antistatic protective film for OLED according to claim 1, characterized in that: A hardening layer is arranged between the first substrate layer and the antistatic surface layer.

6. The antistatic protective film for OLED according to claim 1 or 5, characterized in that: The surface of the antistatic surface layer away from the first substrate layer is provided with a second substrate layer, and the second substrate layer includes a second adhesive layer, a supporting base layer and an antistatic coating layer stacked in sequence along the film thickness direction, and the second adhesive layer is connected to the antistatic surface layer.

7. The antistatic protective film for OLED according to claim 1, characterized in that: An antistatic release film is disposed on a surface of the first adhesive layer away from the first substrate layer.

8. The antistatic protective film for OLED according to claim 7, characterized in that: The antistatic release film comprises a PET layer, the inner surface of the PET layer is connected to the release layer, and at least the inner surface of the PET layer is provided with an antistatic bottom layer.

9. The antistatic protective film for OLED according to claim 1, characterized in that: The first adhesive layer is polyurethane pressure-sensitive adhesive.

10. The antistatic protective film for OLED according to claim 1 or 9, characterized in that: One surface of the first adhesive layer is connected to the first substrate layer, and the other surface is provided with a concave-convex surface.

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