Heat dissipation intelligent display mobile phone rear cover inner explosion-proof film

Abstract

The utility model discloses an explosion-proof membrane in a rear cover of a heat-dissipation intelligent display mobile phone, and belongs to the field of heat-dissipation adhesive tapes of electronic products. The explosion-proof film comprises a release film protection layer, a temperature-resistant heat dissipation adhesive layer, a base material layer, an adhesive force enhancing priming coat, a thermosensitive liquid crystal color-changing ink layer, a heat conduction bonding layer and a heat conduction material layer which are sequentially stacked. The heat dissipation process can be effectively accelerated by adding heat conduction particles in the temperature-resistant heat dissipation adhesive layer and utilizing air convection; the thermosensitive liquid crystal color-changing ink layer can intelligently display the temperature of the rear cover of the mobile phone in real time, and the heat dissipation effect can be visually felt.

Description

Technical Field

[0001] The utility model relates to the field of heat dissipation tapes for electronic products, in particular to a novel heat dissipation explosion-proof film inside the back cover of an intelligent display mobile phone. Background Art

[0002] With the promotion of new wireless applications such as 5G and wireless charging in high-end mobile phones, the types and areas of antennas on mobile phones need to be greatly innovated, and the traditional antenna implementation methods must also be upgraded. Therefore, although the metal casing has a more outstanding texture, the existing signal shielding problem greatly limits its application in the flagship phones with new functions in the new era. On the contrary, glass and ceramics have become the perfect materials for the back covers of mid-to-high-end mobile phones in the future. At present, ceramic materials are heavy and costly, and as the wear resistance and hardness of glass materials continue to improve, its advantages such as diverse color schemes and balanced performance in all aspects make it the mainstream material for the back covers of mobile phones in the future.

[0003] Although the glass back cover has so many advantages, its fragility and splash after breaking have become its fatal flaws, so it is necessary to attach an explosion-proof film to avoid the above situation. As a small electronic product, the CPU, chip, processor, mobile phone battery, etc. inside the mobile phone are assembled very tightly, which is easy to generate a lot of heat when used at high frequency. This heat is not easy to export, and the long-term accumulation of this heat will accelerate the aging of internal components, causing the mobile phone to freeze and freeze. The current explosion-proof film mainly uses UV transfer, coating, silk screen, vacuum bonding and other processes on the PET base film to design the color of the mobile phone glass back cover, which only plays a decorative role on the back cover. The heat dissipation of the mobile phone back cover is mainly achieved by attaching a disposable heat dissipation sticker or adding a heat dissipation mobile phone case as an additional material. These heat dissipation methods are inconvenient to use and the heat dissipation effect cannot be intuitively felt. Summary of the invention

[0004] In view of this, the utility model provides an explosion-proof film inside the back cover of a heat-dissipating intelligent display mobile phone. By adding thermally conductive particles to the temperature-resistant heat-dissipating adhesive layer and adding temperature-sensitive components to the thermosensitive liquid crystal color-changing ink, the mobile phone back cover design, heat conduction, heat dissipation, intuitive feeling of heat dissipation effect, explosion-proof and other functions are simultaneously realized.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A heat-dissipating explosion-proof film inside the back cover of a smart display mobile phone comprises a release film protective layer, a temperature-resistant heat-dissipating adhesive layer, a substrate layer, an adhesion-enhancing primer layer, a thermosensitive liquid crystal color-changing ink layer, a thermally conductive adhesive layer, and a thermally conductive material layer; one side of the substrate layer is coated with the adhesion-enhancing primer layer, and the other side is coated with the temperature-resistant heat-dissipating adhesive layer; the other side of the temperature-resistant heat-dissipating adhesive layer is the release film protective layer, the other side of the adhesion-enhancing primer layer is the thermosensitive liquid crystal color-changing ink layer, the other side of the thermosensitive liquid crystal color-changing ink layer is coated with a thermally conductive adhesive layer, and the other side of the thermally conductive adhesive layer is bonded to a thermally conductive material layer.

[0007] A preferred technical solution is that the release film protective layer is a PET release film with a thickness of 50-125 μm.

[0008] A preferred technical solution is to add thermally conductive particles to the temperature-resistant heat dissipation adhesive layer, wherein the thermally conductive particles are one or more of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and magnesium oxide.

[0009] The preferred technical solution is to add a triazine ultraviolet absorber to the temperature-resistant heat dissipation adhesive layer to prevent the ultraviolet rays in the sunlight from aging the liquid crystal in the thermosensitive liquid crystal color-changing ink layer after long-term sun exposure, causing the explosion-proof film to lose its color-changing effect.

[0010] A preferred technical solution is that the thickness of the temperature-resistant heat dissipation adhesive layer is 15-25 μm.

[0011] A preferred technical solution is that the substrate layer is a PET film or a PI film with a light transmittance of more than 90% and a thickness of 23-50 μm.

[0012] A preferred technical solution is that the substrate layer is a high-transmittance PET film that is resistant to high temperatures and has low shrinkage.

[0013] The preferred technical solution is that the adhesion enhancing primer is a coating obtained by heat curing a two-component functional coating agent compounded with an acrylic polymer main agent and an isocyanate curing agent, and the thickness is 100-800 nm.

[0014] The preferred technical solution is that the thermosensitive liquid crystal color-changing ink layer is a thermosensitive liquid crystal color-changing ink layer to which cholesteryl ester compounds are added. The cholesteryl ester compounds have a helical structure with unique optical properties, which endows the ink layer with high sensitivity to temperature changes. As the temperature rises, the helical pitch gradually decreases, the wavelength of the scattered light moves toward the short wave, and the color changes from red to purple accordingly. When the temperature drops, the color changes from purple to red, so that the ink layer can reflect the temperature changes in real time.

[0015] A preferred technical solution is that the thickness of the thermosensitive liquid crystal color-changing ink layer is 5-10 μm.

[0016] A preferred technical solution is that the thermally conductive adhesive layer is a thermally conductive silicone layer with a thickness of 10-20 μm.

[0017] The preferred technical solution is that the thermal conductive material layer is a graphite sheet layer with a thickness of 15-50 μm; the thermal conductive material layer evenly distributes the point heat source temperature of the mobile phone on a plane through diffusion, which facilitates uniform heat dissipation and can effectively control the temperature of the high-temperature heat source.

[0018] Beneficial effects of the utility model:

[0019] 1. The explosion-proof film inside the back cover of the heat-dissipating smart display mobile phone is stacked from bottom to top in sequence: a release film protective layer, a temperature-resistant heat-dissipating adhesive layer, a substrate layer, an adhesion-enhancing primer layer, a thermosensitive liquid crystal color-changing ink layer, a heat-conductive adhesive layer, and a heat-conductive material layer; it can simultaneously realize the appearance design of the back cover of the mobile phone, heat conduction, heat dissipation, intuitive feeling of heat dissipation effect, explosion-proof and other functions; it is more convenient for users to use, and there is no need to use disposable heat dissipation stickers or install heat dissipation mobile phone cases.

[0020] 2. By adding thermal conductive particles to the temperature-resistant heat dissipation adhesive layer and utilizing air convection, the heat dissipation process can be effectively accelerated.

[0021] 3. Adhesion enhancement The primer layer can significantly enhance the adhesion of the ink layer on the substrate layer, thereby ensuring that the ink can be firmly attached to the substrate and is not easy to fall off or peel off.

[0022] 4. The thermosensitive liquid crystal color-changing ink layer can intelligently display the temperature information of the back cover of the mobile phone in real time. It displays different colors as the temperature changes. Users can intuitively understand the temperature status of the back cover of the mobile phone and then judge the heat dissipation effect of the mobile phone. This design not only improves the intelligence level of the mobile phone, but also enhances the interactivity between the user and the mobile phone. Users can adjust the use of the mobile phone according to the displayed temperature information, such as reducing high-load running applications, using heat dissipation back clips, etc., to improve the heat dissipation performance of the mobile phone and extend the service life of the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] In the figure: 1. Release film protective layer; 2. Heat-resistant heat dissipation adhesive layer; 3. Base material layer; 4. Adhesion enhancing primer layer; 5. Thermosensitive liquid crystal color-changing ink layer; 6. Thermal conductive adhesive layer; 7. Thermal conductive material layer. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] Embodiment 1:

[0027] like Figure 1A heat-dissipating explosion-proof film inside the back cover of a smart display mobile phone, comprising a 125 μm PET release film protective layer (1), a 25 μm silicon nitride-containing temperature-resistant heat-dissipating adhesive layer (2), a 50 μm PET film with a light transmittance of 92% (3), a 500 nm adhesion-enhancing primer layer (4), a 10 μm thermosensitive liquid crystal color-changing ink layer (5), a 15 μm thermally conductive silicone layer (6), and a 35 μm graphite sheet thermally conductive material layer (7) which are stacked in sequence.

[0028] Comparative Example 1:

[0029] A heat-dissipating explosion-proof film inside the back cover of a smart display mobile phone, comprising a 125 μm PET release film protective layer (1), a 25 μm silicon nitride-containing temperature-resistant heat-dissipating adhesive layer (2), a 50 μm PET film with a light transmittance of 92% (3), a 500 nm adhesion-enhancing primer layer (4), a 10 μm orange ink layer (5), a 15 μm heat-conducting silicone layer (6), and a 35 μm graphite sheet heat-conducting material layer (7) which are stacked in sequence.

[0030] Comparative Example 2:

[0031] A heat-dissipating explosion-proof film inside the back cover of a smart display mobile phone comprises a 125 μm PET release film protective layer (1), a 25 μm heat-dissipating adhesive layer (2) without heat-conducting particles, a 50 μm PET film (3) with a light transmittance of 92%, a 500 nm adhesion-enhancing primer layer (4), and a 10 μm orange ink layer (5) which are stacked in sequence.

[0032] Comparative Example 3:

[0033] A heat-dissipating explosion-proof film inside the back cover of a smart display mobile phone comprises a 125 μm PET release film protective layer (1), a 25 μm heat-dissipating adhesive layer (2) without heat-conducting particles, a 25 μm PET film with a light transmittance of 92% (3), a 500 nm adhesion-enhancing primer layer (4), a 10 μm thermosensitive liquid crystal color-changing ink layer (5), a 15 μm heat-conducting silicone layer (6), and a 35 μm graphite sheet heat-conducting material layer (7) which are stacked in sequence.

[0034] The preparation method of the explosion-proof film inside the back cover of the heat dissipation intelligent display mobile phone is as follows:

[0035] Step 1: Add the acrylic polymer main agent, isocyanate curing agent and solvent into the liquid preparation bucket in sequence, stir for 20-40 minutes, and then let stand for 0.5-1 hour to prepare a coating liquid 1 with a solid content of 10-15%;

[0036] Step 2: evenly apply the prepared coating liquid 1 to the PET surface, and dry at 120° C. for 3 min to obtain an adhesion-enhancing primer layer;

[0037] Step 3: Add the acrylic polymer main agent, epoxy curing agent, thermal conductive particles, ultraviolet absorber and solvent into the liquid preparation bucket in sequence, stir for 20-40 minutes, and then stand for 0.5-4 hours to prepare a coating liquid 2 with a solid content of 25-35%;

[0038] Step 4: evenly apply the prepared coating liquid 2 to the other side of the PET, and fully dry it at 120-140°C to obtain a temperature-resistant heat dissipation adhesive layer;

[0039] Step 5: Attach the release film to the surface of the heat-resistant heat dissipation adhesive layer to ensure that there are no bubbles;

[0040] Step 6: Curing the product obtained in step 5 at 40°C for 3-4 days;

[0041] Step 7: Add the main agent, auxiliary agent, binder, defoamer and water-soluble resin of the liquid crystal microcapsule containing cholesterol ester compound into the liquid preparation barrel in sequence, and stir for 15-30 minutes to obtain ink;

[0042] Step 8: Evenly apply the prepared ink to the other side of the adhesion enhancing primer layer through a 180-230 mesh anilox roller, and fully dry at 40-60° C. to obtain a thermosensitive liquid crystal color-changing ink layer;

[0043] Step nine, coating a thermally conductive silicone layer on the thermosensitive liquid crystal color-changing ink layer;

[0044] Step 10: Bond the graphite sheet made by pressing the artificial graphite powder to the thermosensitive liquid crystal color-changing ink layer through a 20 μm thermal conductive silicone to obtain a heat-dissipating explosion-proof film inside the back cover of the smart display mobile phone.

[0045] The explosion-proof films prepared in Example 1 and Comparative Examples 1-3 were tested:

[0046] Remove the protective layer of the release film, stick the heat-resistant heat dissipation adhesive layer of the explosion-proof film to the glass back covers of four mobile phones of the same model, open the same high-energy consumption software, and perform the following tests on the glass back covers of the four mobile phones:

[0047] Test 1: Place the phone in a 25°C room temperature environment and observe the color change through the glass back cover of the phone before and 10 minutes, 20 minutes, 30 minutes, 45 minutes, and 60 minutes after the software is turned on.

[0048] Test 2: Place the phone in a 25°C room temperature environment and test the temperature of the phone’s glass back cover before opening the software and at 10min, 20min, 30min, 45min, and 60min after opening it.

[0049] The test results are shown in Tables 1 and 2.

[0050] Table 1 Mobile phone glass back cover color display

[0051] project Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Before starting the software orange color orange color orange color orange color Software started for 10 minutes orange color orange color orange color orange color Software started for 20 minutes orange color orange color orange color yellow Software started for 30 minutes yellow orange color orange color yellow Software started for 45 minutes yellow orange color orange color green Software started for 60 minutes green orange color orange color blue

[0052] Table 2 Temperature changes of mobile phone glass back cover

[0053] project Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Before starting the software 25.0℃ 25.0℃ 25.0℃ 25.0℃ Software started for 10 minutes 25.4℃ 25.7℃ 27.8℃ 26.2℃ Software started for 20 minutes 26.5℃ 26.3℃ 32.1℃ 28.3℃ Software started for 30 minutes 28.1℃ 28.3℃ 36.5℃ 31.5℃ Software started for 45 minutes 30.2℃ 29.8℃ 39.2℃ 35.4℃ Software started for 60 minutes 33.4℃ 33.1℃ 43.3℃ 38.1℃

[0054] The above-mentioned embodiments are only specific application examples of the present utility model. The description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present utility model.

[0055] It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A heat dissipation explosion-proof film inside the back cover of a smart display mobile phone, characterized in that: It includes a release film protective layer, a temperature-resistant heat dissipation adhesive layer, a substrate layer, an adhesion enhancing primer layer, a thermosensitive liquid crystal color-changing ink layer, a thermally conductive adhesive layer, and a thermally conductive material layer; one side of the substrate layer is coated with an adhesion enhancing primer layer, and the other side is coated with a temperature-resistant heat dissipation adhesive layer; the other side of the temperature-resistant heat dissipation adhesive layer is a release film protective layer, the other side of the adhesion enhancing primer layer is a thermosensitive liquid crystal color-changing ink layer, the other side of the thermosensitive liquid crystal color-changing ink layer is coated with a thermally conductive adhesive layer, and the other side of the thermally conductive adhesive layer is bonded to a thermally conductive material layer.

2. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thickness of the release film protective layer is 50-125 μm.

3. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thickness of the temperature-resistant heat dissipation adhesive layer is 15-25 μm.

4. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The substrate layer has a light transmittance of more than 90% and a thickness of 23-50 μm.

5. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 4, characterized in that: The substrate layer is a high-transparency PET film that is resistant to high temperatures and has low shrinkage.

6. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thickness of the adhesion enhancing primer layer is 100-800 nm.

7. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thickness of the thermosensitive liquid crystal color-changing ink layer is 5-10 μm.

8. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thermally conductive adhesive layer is a thermally conductive silicone layer with a thickness of 10-20 μm.

9. The explosion-proof film inside the back cover of a heat dissipating smart display mobile phone according to claim 1, characterized in that: The thermal conductive material layer is a graphite sheet layer with a thickness of 15-50 μm.

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