Peep-proof hydrogel film and preparation process thereof

Abstract

The invention relates to a peep-proof hydrogel film and a preparation process thereof. The peep-proof hydrogel film sequentially comprises a protective layer, a surface treatment layer, a base material layer, a UV structural adhesive layer, a UV black adhesive layer, a pressure-sensitive adhesive layer and a release layer from top to bottom, the protective layer is connected with one side of the surface treatment layer, and one side of the surface treatment layer back to the protective layer is connected with the base material layer; the surface, opposite to the surface treatment layer, of the base material layer is connected with the UV structural adhesive layer, and the surface, opposite to the base material layer, of the UV structural adhesive layer is connected with one surface of the UV black adhesive layer; one surface, opposite to the UV structural adhesive layer, of the UV black adhesive layer is connected with the pressure-sensitive adhesive layer, and one surface, opposite to the UV black adhesive layer, of the pressure-sensitive adhesive layer is connected with the release layer. The peep-proof hydrogel film can be attached to the 3D curved screen, and the privacy protection performance is high. And the anti-peeping film has good light transmission performance while ensuring excellent anti-peeping performance. And the user experience of watching the mobile phone screen from the front is not influenced. In addition, the peep-proof hydrogel film is high in sensitivity, and unlocking of a mobile phone screen by fingerprints of a user is not affected.

Description

Technical Field

[0001] The invention relates to the field of hydrogel film production, in particular to an anti-peeping hydrogel film and a preparation process thereof. Background Art

[0002] Mobile phone film, also known as mobile phone beauty film and mobile phone protective film, is a kind of cold mounting film that can be used to mount the surface of mobile phone body, screen and other tangible objects. There are many types of mobile phone films. Because mobile phone films were originally widely used for mobile phone beauty, they were named "mobile phone films". Because the mobile phone mounted with mobile phone films can be brand new and dazzling, it can not only play the effect of refurbishing old phones, but also can be waterproof and prevent dust from entering the keyboard and screen, playing a protective role, so people also call it mobile phone beauty film and mobile phone protective film. Mobile phone films can be divided into: mobile phone screen films and mobile phone body films according to their uses. According to their functions, they can be divided into: mobile phone screen anti-peep films, mobile phone screen anti-scratch films, mobile phone body anti-scratch films, and mobile phone body decorative films. According to their materials, they can be divided into: mobile phone transparent films, colored pearl films, and colored pearlescent films. According to the principle of film mounting, they can be divided into: adhesive films and electrostatic films.

[0003] However, mobile phone screen films are divided into hydrogel films, tempered films, film films, high-transmittance films, etc. Most of the current mobile phone screens use 3D curved screens, and traditional hydrogel films, such as the patent application number CN202022412738.2, the invention name of which is a technical solution to be protected by a patent for a curved screen using hydrogel films, do not have an anti-peeping function and cannot meet the user's anti-peeping needs for protective films. Summary of the invention

[0004] Based on this, it is necessary to provide an anti-peeping hydrogel film and its preparation process to address the technical problem that traditional hydrogel films do not have an anti-peeping function and cannot meet users' anti-peeping needs for protective films.

[0005] An anti-peeping hydrogel film, which comprises, from top to bottom, a protective layer, a surface treatment layer, a substrate layer, a UV structural adhesive layer, a UV black adhesive layer, a pressure-sensitive adhesive layer and a release layer; The protective layer is connected to one side of the surface treatment layer, and the side of the surface treatment layer facing away from the protective layer is connected to the substrate layer; the side of the substrate layer facing away from the surface treatment layer is connected to the UV structural adhesive layer, and the side of the UV structural adhesive layer facing away from the substrate layer is connected to one side of the UV black glue layer; the side of the UV black glue layer facing away from the UV structural adhesive layer is connected to the pressure-sensitive adhesive layer, and the side of the pressure-sensitive adhesive layer facing away from the UV black glue layer is connected to the release layer.

[0006] In one embodiment, the protective layer is an acrylic protective film.

[0007] In one embodiment, the protective layer is a PU protective film.

[0008] In one embodiment, the protective layer is a silicone protective film.

[0009] In one embodiment, the surface treatment layer is a solvent-based UV polyurethane layer.

[0010] In one embodiment, the surface treatment layer is a solvent-free UV polyurethane layer.

[0011] In one embodiment, the surface treatment layer is PU glue.

[0012] In one embodiment, the substrate layer is a PET layer.

[0013] In one embodiment, the substrate layer is an EPU layer.

[0014] A preparation process of an anti-peeping hydrogel film is used to prepare the anti-peeping hydrogel film described in any of the above embodiments, and the process comprises the following steps: UV structural adhesive layer coating step: coating the structural adhesive resin onto the substrate layer and curing it through UV to form a UV structural adhesive layer; UV black glue layer coating steps: coating the black glue raw material on the cured UV structural glue layer, curing it through UV to form a UV black glue layer, and covering the UV black glue layer with a layer of black glue protective film; Pressure-sensitive adhesive layer coating steps: tear off the black adhesive protective film, apply the pressure-sensitive adhesive to the surface of the UV black adhesive layer, form a pressure-sensitive adhesive layer after oven drying and curing, and adhere a release layer to the pressure-sensitive adhesive layer; Surface treatment layer coating step: coating the surface treatment adhesive on the side of the substrate layer facing away from the UV structural adhesive layer; Protective layer adhesion step: Cover the surface of the surface treatment rubber with a release protective film, and after UV curing to form a surface treatment layer, peel off the release protective film and adhere the surface protective film on the surface treatment layer as a protective layer The above-mentioned anti-peep hydrogel film can be bonded to a 3D curved screen, and has strong privacy protection performance. It has good light transmittance while ensuring excellent anti-peep performance. It does not affect the user's experience of viewing the mobile phone screen from the front. In addition, the above-mentioned anti-peep hydrogel film has strong sensitivity and does not affect the user's fingerprint unlocking of the mobile phone screen. The above-mentioned anti-peep hydrogel film preparation process steps are concise and exquisite, easy to control, and each step is careful and meticulous. The anti-peep hydrogel film obtained by the above-mentioned anti-peep hydrogel film preparation process can be bonded to a 3D curved screen, and has strong privacy protection performance. It has good light transmittance while ensuring excellent anti-peep performance. It does not affect the user's experience of viewing the mobile phone screen from the front. In addition, the above-mentioned anti-peep hydrogel film has strong sensitivity and does not affect the user's fingerprint unlocking of the mobile phone screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of an anti-peeping hydrogel film in one embodiment; Figure 2 The figure is a schematic diagram of a process for preparing an anti-peeping hydrogel film in one embodiment. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 of the present invention.

[0017] In addition, the terms "first" and "second" 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, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0021] See also Figure 1 The present invention provides an anti-peeping hydrogel film 10, which includes a protective layer 100, a surface treatment layer 200, a substrate layer 300, a UV structural adhesive layer 400, a UV black glue layer 500, a pressure-sensitive adhesive layer 600 and a release layer 700 from top to bottom.

[0022] In this embodiment, the protective layer 100 is an acrylic protective film. In another embodiment, the protective layer 100 is a PU protective film. In yet another embodiment, the protective layer 100 is a silicone protective film. The protective layer 100 is connected to one side of the surface treatment layer 200. The peeling force of the protective layer 100 is 2 gf / 25mm to 5 gf / 25mm.

[0023] The surface treatment layer 200 is connected to the substrate layer 300 on the side facing away from the protective layer 100. In this embodiment, the surface treatment layer 200 is a solvent-based UV polyurethane layer. In another embodiment, the surface treatment layer 200 is a solvent-free UV polyurethane layer. In yet another embodiment, the surface treatment layer 200 is PU glue. The light transmittance of the surface treatment layer 200 is greater than 94%, the haze is less than 0.5%, and the dynamic friction coefficient is less than 0.07.

[0024] The side of the substrate layer 300 facing away from the surface treatment layer 200 is connected to the UV structural adhesive layer 400. In this embodiment, the substrate layer 300 is a PET layer. In another embodiment, the substrate layer 300 is an EPU layer. In yet another embodiment, the substrate layer 300 is a TPU layer. The thickness of the substrate layer 300 is 23 microns to 125 microns. Further, the thickness of the substrate layer 300 is 23 microns to 25 microns.

[0025] The side of the UV structural adhesive layer 400 facing away from the substrate layer 300 is connected to the side of the UV black glue layer 500. In this embodiment, the UV structural adhesive layer 400 is formed by curing a solvent-free UV polyurethane resin. In another embodiment, the UV structural adhesive layer 400 is formed by curing a solvent-free UV polyester resin. In yet another embodiment, the UV structural adhesive layer 400 is formed by curing a solvent-free epoxy resin. In other embodiments, the UV structural adhesive layer 400 is a mixture of two or three of a solvent-free UV polyurethane resin, a solvent-free UV polyester resin, and a solvent-free epoxy resin.

[0026] The side of the UV black glue layer 500 facing away from the UV structural glue layer 400 is connected to the pressure-sensitive glue layer 600. The UV black glue layer 500 is formed by curing black glue raw material.

[0027] The side of the pressure-sensitive adhesive layer 600 facing away from the UV black glue layer 500 is connected to the release layer 700. In the present embodiment, the pressure-sensitive adhesive layer 600 is an acrylic pressure-sensitive adhesive. In another embodiment, the pressure-sensitive adhesive layer 600 is a PU adhesive. The light transmittance of the pressure-sensitive adhesive layer 600 is greater than 92%, and the haze is less than 0.5%. In the present embodiment, the release layer 700 is a PET silicone oil release film, and the release force of the release layer 700 is 3 gf / 25mm to 15gf / 25mm, and further, the release force of the release layer 700 is 5 gf / 25mm to 10gf / 25mm. The thickness of the release layer 700 is 36 microns to 125 microns, and further, the thickness of the release layer 700 is 75 microns.

[0028] The above-mentioned anti-peeping hydrogel film 10 can be bonded to a 3D curved screen, and has strong privacy protection performance. It has good light transmission performance while ensuring excellent anti-peeping performance. It does not affect the user's experience of watching the mobile phone screen from the front. In addition, the above-mentioned anti-peeping hydrogel film 10 has strong sensitivity and does not affect the user's fingerprint unlocking of the mobile phone screen.

[0029] See also Figure 2 The present invention also provides a preparation process of an anti-peeping hydrogel film, which is used to prepare the anti-peeping hydrogel film 10 described in any of the above embodiments, and the process comprises the following steps: Step 101: UV structural adhesive layer coating step: coating the structural adhesive resin onto the substrate layer 300 and forming the UV structural adhesive layer 400 through UV curing.

[0030] The structural adhesive resin is one or more of solvent-free UV polyurethane resin, solvent-free UV polyester resin and solvent-free epoxy resin.

[0031] Specifically, the structural adhesive resin is coated on the substrate layer 300 by using a structural roll-pressed film curing process with a shutter structure, and then cured by UV to form a UV structural adhesive layer 400. The coating thickness of the structural adhesive resin is 80 microns.

[0032] Step 102: UV black glue layer coating step: coating the black glue raw material on the cured UV structural glue layer 400, curing it through UV to form a UV black glue layer 500, and covering the UV black glue layer 500 with a layer of black glue protective film.

[0033] The black glue raw material includes the following components in parts by weight: 10 to 30 parts of polyurethane UV resin, 70 to 90 parts of acrylate monomer, 3 to 10 parts of nano black pigment and 3 to 8 parts of initiator. Specifically, the polyurethane UV resin is one or both of a difunctional polyurethane UV resin and a trifunctional polyurethane UV resin. The acrylate monomer is one or both of a monofunctional acrylate monomer and a difunctional acrylate monomer.

[0034] Specifically, the black glue raw material is coated on the cured UV structural glue layer 400, and then UV-cured to form the UV black glue layer 500, and a black glue protective film is covered on the UV black glue layer 500 to protect the surface of the UV black glue layer 500. In this embodiment, the black glue protective film is a PE film.

[0035] Step 103: Pressure-sensitive adhesive layer coating step: tear off the black adhesive protective film, apply the pressure-sensitive adhesive to the surface of the UV black adhesive layer 500, form a pressure-sensitive adhesive layer 600 after oven drying and curing, and adhere a release layer 700 to the pressure-sensitive adhesive layer 600.

[0036] Specifically, the black glue protective film is torn off, and the pressure-sensitive adhesive is coated on the surface of the UV black glue layer 500, and the pressure-sensitive adhesive coating thickness is 30 microns to 50 microns. After being dried and cured in an oven, a pressure-sensitive adhesive layer 600 is formed, and a release layer 700 is adhered to the pressure-sensitive adhesive layer 600. The temperature of the oven is 120 degrees Celsius. The baking time is 2 minutes.

[0037] Step 104: Surface treatment layer coating step: coating the surface treatment adhesive on the side of the substrate layer 300 facing away from the UV structural adhesive layer 400 .

[0038] Among them, the surface treatment adhesive is solvent-free UV polyurethane adhesive.

[0039] Specifically, the surface treatment adhesive is coated on the side of the substrate layer 300 facing away from the UV structural adhesive layer 400. The coating thickness of the surface treatment adhesive is 15 micrometers to 20 micrometers.

[0040] Step 105: Protective layer adhesion step: Cover the surface of the surface treatment rubber with a release protective film, and after UV curing to form a surface treatment layer 200, peel off the release protective film and adhere a surface protective film on the surface treatment layer 200 as a protective layer 100.

[0041] The release protective film is a silicone oil release film, and the surface protective film is an acrylic film.

[0042] Specifically, the surface of the surface treatment rubber is covered with a release protective film, and after UV curing to form the surface treatment layer 200 , the release protective film is peeled off, and an acrylic film is adhered on the surface treatment layer 200 as the protection layer 100 .

[0043] The above-mentioned anti-peeping hydrogel film preparation process is concise and exquisite, easy to control, and each step is carefully and meticulously. The anti-peeping hydrogel film 10 obtained by the above-mentioned anti-peeping hydrogel film preparation process can be bonded to a 3D curved screen, and has strong privacy protection performance. It has good light transmission performance while ensuring excellent anti-peeping performance. It does not affect the user's experience of watching the mobile phone screen from the front. In addition, the above-mentioned anti-peeping hydrogel film has strong sensitivity and does not affect the user's fingerprint unlocking of the mobile phone screen. The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An anti-peep hydrogel film, characterized in that: From top to bottom, it includes a protective layer, a surface treatment layer, a substrate layer, a UV structural adhesive layer, a UV black adhesive layer, a pressure-sensitive adhesive layer and a release layer; The protective layer is connected to one side of the surface treatment layer, and the side of the surface treatment layer facing away from the protective layer is connected to the substrate layer; The side of the substrate layer facing away from the surface treatment layer is connected to the UV structural adhesive layer, and the side of the UV structural adhesive layer facing away from the substrate layer is connected to a side of the UV black glue layer; the side of the UV black glue layer facing away from the UV structural adhesive layer is connected to the pressure-sensitive adhesive layer, and the side of the pressure-sensitive adhesive layer facing away from the UV black glue layer is connected to the release layer.

2. The anti-peeping hydrogel film according to claim 1, characterized in that: The protective layer is an acrylic protective film.

3. The anti-peeping hydrogel film according to claim 1, characterized in that: The protective layer is a PU protective film.

4. The anti-peeping hydrogel film according to claim 1, characterized in that: The protective layer is a silicone protective film.

5. The anti-peeping hydrogel film according to claim 1, characterized in that: The surface treatment layer is a solvent-based UV polyurethane layer.

6. The anti-peeping hydrogel film according to claim 1, characterized in that: The surface treatment layer is a solvent-free UV polyurethane layer.

7. The anti-peeping hydrogel film according to claim 1, characterized in that: The surface treatment layer is PU glue.

8. The anti-peeping hydrogel film according to claim 1, characterized in that: The substrate layer is a PET layer.

9. The anti-peeping hydrogel film according to claim 1, characterized in that: The substrate layer is an EPU layer.

10. A process for preparing an anti-peeping hydrogel film, used for preparing the anti-peeping hydrogel film as claimed in any one of claims 1 to 9, characterized in that: The process comprises the following steps: UV structural adhesive layer coating step: coating the structural adhesive resin onto the substrate layer and curing it through UV to form a UV structural adhesive layer; UV black glue layer coating steps: coating the black glue raw material on the cured UV structural glue layer, curing it through UV to form a UV black glue layer, and covering the UV black glue layer with a layer of black glue protective film; Pressure-sensitive adhesive layer coating steps: tear off the black adhesive protective film, apply the pressure-sensitive adhesive to the surface of the UV black adhesive layer, form a pressure-sensitive adhesive layer after oven drying and curing, and adhere a release layer to the pressure-sensitive adhesive layer; Surface treatment layer coating step: coating the surface treatment adhesive on the side of the substrate layer facing away from the UV structural adhesive layer; Protective layer adhesion step: Cover the surface of the surface treatment rubber with a release protective film, and after UV curing to form a surface treatment layer, peel off the release protective film and adhere the surface protection film on the surface treatment layer as a protective layer.

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