Mobile phone rear cover 3D glass PVD electroplating process protective film

Abstract

A mobile phone rear cover 3D glass PVD electroplating process protective film comprises a using layer and a release film, the using layer comprises a first base material layer, a composite temperature-resistant adhesive layer, a second base material layer and a temperature-resistant using adhesive layer, the composite temperature-resistant adhesive layer is arranged between the first base material layer and the second base material layer, the temperature-resistant using adhesive layer is arranged on the second base material layer, and the release film is arranged on the first base material layer. And the release film is arranged on the temperature-resistant adhesive layer. According to the utility model, the structure of the double-layer high-temperature-resistant transparent PET and the two heat-resistant adhesive layers is adopted, the composite heat-resistant adhesive layer and the heat-resistant use adhesive layer have better heat resistance and high-temperature fitting performance in the PVD electroplating process, and a better fitting effect is achieved on the curved surface of the 3D glass in a high-temperature environment; and on the basis of not influencing the physical properties of the glue, the high temperature resistance is improved, and the reject ratio of no residual glue and overflow plating in the PVD electroplating process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of protective films, in particular to a 3D glass PVD electroplating process protective film for a mobile phone rear cover. Background Art

[0002] PVD electroplating technology refers to the technology of using physical methods to vaporize the solid surface of the material source into gaseous atoms or molecules, or partially ionize into ions under vacuum conditions, and deposit a thin film with certain special functions on the surface of the substrate through a low-pressure gas or plasma process. This patent is an invention for the PVD electroplating process protection of the 3D glass on the back cover of mobile phones. At this stage, people have higher and higher requirements for the beauty of mobile phones. The curvature of the curved surface of the 3D glass on the back cover of mobile phones can reach 2-3mm, which has higher requirements for the electroplating process protective film. At present, most protective films are made of single-layer PET material, coated with a layer of acrylic glue, and rolled up with a release film. General single-layer protective films will have difficulty in pasting during the process, and bubbles, residual glue, overflow plating and other defects will occur in high temperature environments. Utility Model Content

[0003] The purpose of the utility model is to provide a PVD electroplating process protective film for 3D glass on the back cover of a mobile phone, aiming to solve the above-mentioned technical problems. The utility model adopts a double-layer structure of high-temperature resistant transparent PET and a double-layer heat-resistant adhesive layer on the use layer. The double-layer heat-resistant adhesive layer adopts a composite heat-resistant adhesive layer and a heat-resistant use adhesive layer. The high-temperature resistant transparent PET, the composite heat-resistant adhesive layer and the heat-resistant use adhesive layer have good heat resistance and high-temperature bonding performance in the PVD electroplating process, and have a good compliant effect on the 3D glass curved surface under a high temperature environment. A heat-resistant additive is added to the use layer glue, and on the basis of not affecting the physical properties of the glue itself, the defective rate of residual glue and overflow plating in the PVD electroplating process is improved.

[0004] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0005] A protective film for a 3D glass PVD electroplating process on a mobile phone back cover comprises a use layer and a release film, wherein the use layer comprises a first substrate layer, a composite heat-resistant adhesive layer, a second substrate layer and a heat-resistant use adhesive layer, the composite heat-resistant adhesive layer is arranged between the first substrate layer and the second substrate layer, the heat-resistant use adhesive layer is arranged on the second substrate layer, and the release film is arranged on the heat-resistant use adhesive layer. Such a combination sequence helps to improve the fit effect, and there is no need to add a cover film in the film-sticking process, thereby reducing the process cost.

[0006] Furthermore, the first substrate layer is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm.

[0007] Furthermore, the second substrate layer is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm.

[0008] Furthermore, the thickness range of the heat-resistant adhesive layer is 20-30 μm, the temperature range is 200°C-350°C, and the viscosity range is 300-1000gf / 25mm. The heat-resistant adhesive layer has good heat resistance and high-temperature bonding performance in the PVD electroplating process, and has a good adhesion effect on the 3D glass curved surface in a high temperature environment.

[0009] Furthermore, the thickness range of the composite heat-resistant adhesive layer is 25-35μm, the temperature range is 200℃-350℃, and the viscosity range is 300~1000gf / 25mm. Heat-resistant additives are added to the heat-resistant adhesive layer and the composite heat-resistant adhesive layer. On the basis of not affecting the physical properties of the glue itself, the temperature resistance of the adhesive layer is also improved, and the defective rate of residual glue and overflow plating in the PVD electroplating process is reduced. The composite heat-resistant adhesive layer has good heat resistance and high-temperature bonding performance in the PVD electroplating process, and has a better adhesion effect on the 3D glass curved surface in a high temperature environment.

[0010] Furthermore, the composite heat-resistant glue layer is a transparent high-temperature resistant glue layer.

[0011] Furthermore, the thickness of the use layer ranges from 50 to 85 μm, and the thickness of the use layer reaches 67 μm, making its high temperature resistance and protection performance even better.

[0012] Furthermore, the release film is a transparent release film with a thickness ranging from 30 to 80 μm. The main function of the transparent release film is to isolate and protect the use layer.

[0013] The utility model discloses a 3D glass PVD electroplating process protective film for a mobile phone rear cover, which has the following beneficial effects:

[0014] 1. The utility model is a 3D glass PVD electroplating process protective film for the back cover of a mobile phone. It has a composite structure of a double-layer high-temperature resistant transparent PET. The thickness of the high-temperature resistant transparent PET is 6μm, and the total thickness of the used layer is 67μm. Compared with the single-layer protective film in the prior art, it improves the difficulty of film pasting, and the defects such as bubbles, residual glue, and overflow plating will appear in a high temperature environment without affecting the performance. It can greatly protect the glass back cover of the mobile phone;

[0015] 2. The utility model is a protective film for the PVD electroplating process of the 3D glass of the back cover of a mobile phone. The heat-resistant adhesive layer and the composite heat-resistant adhesive layer have a heat-resistant additive. Under the premise of not affecting the physical properties of the glue itself, the heat-resistant adhesive layer and the composite heat-resistant adhesive layer are improved in heat resistance. The heat-resistant adhesive layer and the composite heat-resistant adhesive layer can be continuously resistant to 220°C within 1 hour, reducing the defective rate of residual glue and overflow plating in the PVD electroplating process, and ensuring that the viscosity range can reach 300-1000gf / 25mm according to the requirements;

[0016] 3. The utility model is a 3D glass PVD electroplating process protective film for the back cover of a mobile phone. The first substrate layer of the use layer adopts high-temperature resistant transparent PET, and a composite heat-resistant adhesive layer is provided on the first substrate layer. The second substrate layer adopts high-temperature resistant transparent PET, and a heat-resistant use layer is provided on the second base layer. Such an arrangement sequence helps to improve the fit effect, and there is no need to add a cover film in the film-sticking process, thereby reducing the process cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the 3D glass PVD electroplating process protective film for the mobile phone back cover of the utility model;

[0018] Figure 2 It is a cross-sectional view of the protective film of the 3D glass PVD electroplating process of the mobile phone back cover of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with embodiments and drawings.

[0020] It should be noted that when an element is referred to as being "fixed to" 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", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figure 1 and Figure 2 As shown, a protective film for a 3D glass PVD electroplating process of a mobile phone back cover includes a use layer and a release film 1, wherein the use layer includes a first substrate layer 3, a composite heat-resistant adhesive layer 2, a second substrate layer 5 and a heat-resistant use adhesive layer 4, wherein the composite heat-resistant adhesive layer 2 is arranged between the first substrate layer 3 and the second substrate layer 5, the heat-resistant use adhesive layer 4 is arranged on the second substrate layer 5, and the release film 1 is arranged on the heat-resistant use adhesive layer 4. Such a combination order helps to improve the fit effect, and there is no need to add a cover film in the film-sticking process, thereby reducing the process cost.

[0023] It should be noted that: in the present utility model, the PVD electroplating process is a new type of electroplating technology. The PVD electroplating technology is mainly used for coating metals and non-metals, such as coating titanium alloys and cobalt alloys. It can also be used for coating non-metals such as the present embodiment, etc. The purpose is to increase the wear resistance and corrosion resistance of the coating, and it can obtain a low-thickness coating. The actual working principle is to heat the material in a solid form to convert it into a gas phase, and then deposit the evaporated material on the surface of the material to be covered to form a thin film. This technology has many advantages, such as strong compatibility with most metals and non-metals, highly uniform film quality, high adhesion, low workpiece deformation and environmental friendliness. However, due to its special processing process, there are general requirements for the heat resistance of covering materials and glue. In this embodiment, the composite heat-resistant glue layer 2 and the heat-resistant glue layer 4 have heat-resistant additives, which not only do not affect the physical properties of the glue itself, but also can improve the temperature resistance of the glue layer, and reduce the defective rate of residual glue and overflow plating in the PVD electroplating process of the utility model. The high-temperature resistant transparent PET has good mechanical and chemical properties, creep resistance, fatigue resistance, and friction resistance, small wear and high hardness, and good toughness; and the high-temperature resistant transparent PET has good electrical insulation properties, is less affected by temperature, is non-toxic, and has an impact strength of three to five times that of other films. The utility model adopts a double-layer high-temperature resistant transparent PET structure. Compared with the single-layer protective film in the prior art, the difficulty of film pasting is improved, and bubbles, residual glue, overflow plating and other adverse effects will occur under high temperature environments, which greatly protects the glass back cover of the mobile phone.

[0024] like Figure 1 and Figure 2 As shown, the first substrate layer 3 is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm. The second substrate layer 5 is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm.

[0025] like Figure 1 and Figure 2 As shown, the thickness range of the heat-resistant adhesive layer 4 is 20-30μm, the temperature range is 200℃-350℃, and the viscosity range is 300~1000gf / 25mm. The heat-resistant adhesive layer 4 has good heat resistance and high-temperature bonding performance in the PVD electroplating process, and has a better adhesion effect on the 3D glass curved surface in a high temperature environment.

[0026] like Figure 1 and Figure 2As shown, the thickness range of the composite heat-resistant adhesive layer 2 is 25-35μm, the temperature range is 200℃-350℃, and the viscosity range is 300~1000gf / 25mm. The heat-resistant adhesive layer 4 and the composite heat-resistant adhesive layer 2 have a heat-resistant additive, which not only does not affect the physical properties of the glue itself, but also improves the temperature resistance of the adhesive layer, reduces the defective rate of residual glue and overflow plating in the PVD electroplating process of the utility model, and has good heat resistance and high-temperature bonding performance in the PVD electroplating process, and has a better adhesion effect on the 3D glass curved surface in a high temperature environment.

[0027] like Figure 1 and Figure 2 As shown, the composite heat-resistant adhesive layer 2 is a transparent heat-resistant adhesive layer. The thickness of the use layer ranges from 50 to 85 μm. In this embodiment, the thickness of the use layer is 67 μm.

[0028] like Figure 1 and Figure 2 As shown, the release film 1 is a transparent release film with a thickness ranging from 30 to 80 μm. The main function of the transparent release film is to isolate and protect the use layer.

[0029] The above description is only a preferred embodiment of the utility model and does not constitute any form of limitation to the utility model. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the utility model, which are all equivalent embodiments of the utility model. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model still belong to the technical solution of the utility model.

Claims

1. A 3D glass PVD electroplating process protective film for a mobile phone back cover, comprising a use layer and a release film, characterized in that: The use layer includes a first substrate layer, a composite heat-resistant adhesive layer, a second substrate layer and a heat-resistant use adhesive layer, the composite heat-resistant adhesive layer is arranged between the first substrate layer and the second substrate layer, the heat-resistant use adhesive layer is arranged on the second substrate layer, and the release film is arranged on the heat-resistant use adhesive layer.

2. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 1, characterized in that: The first substrate layer is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm.

3. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 2, characterized in that: The second substrate layer is made of high temperature resistant transparent PET, and its thickness ranges from 2 to 10 μm.

4. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 3, characterized in that: The thickness of the heat-resistant adhesive layer is in the range of 20-30 μm, the temperature range is 200° C.-350° C., and the viscosity range is 300-1000 gf / 25 mm.

5. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 4, characterized in that: The composite heat-resistant adhesive layer has a thickness range of 25-35 μm, a temperature resistance range of 200° C.-350° C., and a viscosity range of 300-1000 gf / 25 mm.

6. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 5, characterized in that: The composite heat-resistant adhesive layer is a transparent heat-resistant adhesive layer.

7. The protective film for 3D glass PVD electroplating process for mobile phone rear cover according to claim 6, characterized in that: The thickness of the utilization layer is in the range of 50-85 μm.

8. The PVD electroplating process protective film for 3D glass of mobile phone back cover according to claim 7, characterized in that: The release film is a transparent release film, and the thickness thereof is in the range of 30-80 μm.

Images