High-UV-resistance explosion-proof membrane and preparation method of adhesive tape thereof

Abstract

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a high-UV-resistance explosion-proof film and a preparation method of an adhesive tape of the high-UV-resistance explosion-proof film. The pressure-sensitive adhesive tape comprises a base material layer, and a pressure-sensitive adhesive layer and a release film layer are sequentially attached to the top surface of the base material layer outwards; an adhesive force enhancing bottom coating and a protective film are sequentially arranged on the ground of the base material layer outwards; the release film protection layer, the anti-UV adhesive layer, the base material layer and the adhesive force enhancing bottom coating layer are sequentially stacked from bottom to top, and the functions of appearance design, explosion prevention and the like of a rear cover of a mobile phone can be achieved at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a method for preparing a highly UV-resistant explosion-proof film and an adhesive tape thereof. Background Art

[0002] With the continuous improvement of mobile phone manufacturing technology, mobile phones are constantly being iterated, and the overall mobile phones are becoming thinner and lighter. The glass cover of the back cover of the mobile phone is also becoming thinner and lighter, and the color is also developing towards bright and diverse colors. The explosion-proof film inside the back cover of the mobile phone plays a protective role for the mobile phone, preventing the mobile phone from being injured by external impact and glass fragments flying. The explosion-proof film inside the back cover of the mobile phone can play a safety role and also have a decorative effect.

[0003] The explosion-proof film on the back cover of the mobile phone is a layer of PET protective film that can be used on the glass back cover of the mobile phone battery. Its function is to effectively prevent the back cover or screen of the mobile phone from bursting and alleviate the glass panel from breaking when the mobile phone collides with other objects. If there is no explosion-proof film inside the back cover of the mobile phone, then after the glass is broken, the glass will fly everywhere, so the explosion-proof film inside the back cover of the mobile phone reduces the hidden unsafe factors of the glass panel and ensures the safety of users.

[0004] For example, the Chinese patent with patent number CN110103558A discloses a PET explosion-proof film, an explosion-proof glass back cover, and a preparation process of an explosion-proof glass back cover. The PET explosion-proof film includes an OCA optical adhesive layer, a metallic PET base layer, a UV transfer adhesive layer, and a printing layer laminated on top and bottom; the OCA optical adhesive layer is 20-30um thick; the metallic PET base layer is TORAY's PICASUS film or SKC's blue light film, with a thickness of 30-145um.

[0005] The PET explosion-proof film is attached to the glass cover to prevent glass from splashing when the glass back cover of the mobile phone is broken. However, when using a mobile phone, it is frequently exposed to the sun and is exposed to ultraviolet rays for a long time. On the one hand, the film is prone to aging and falling off, and on the other hand, the mobile phone shell and even the internal components are easily affected, aging and malfunctioning, reducing the service life of the mobile phone.

[0006] In order to solve the above problems, the present invention provides a method for preparing a highly UV-resistant explosion-proof film and an adhesive tape thereof. Summary of the invention

[0007] The object of the present invention is to provide a method for preparing a highly UV-resistant explosion-proof film and an adhesive tape thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A highly UV-resistant explosion-proof film, comprising the following components by weight:

[0010]

[0011] More preferably, the curing agent is epoxy resin.

[0012] Preferably, the solvent is ethyl acetate.

[0013] The present invention provides a high-UV resistant explosion-proof film tape, which is made from any one of the above-mentioned high-UV resistant explosion-proof films, and comprises a substrate layer, wherein a pressure-sensitive adhesive layer and a release film layer are sequentially laminated on the top surface of the substrate layer outward; an adhesion enhancing primer layer and a protective film are sequentially arranged on the bottom surface of the substrate layer outward; and the pressure-sensitive adhesive layer is an anti-UV adhesive layer containing a UV absorber.

[0014] The present invention provides a method for preparing a high-UV resistant explosion-proof film, which is used to prepare any of the above-mentioned high-UV resistant explosion-proof films, comprising the following steps:

[0015] S1, prepare glue, add a certain amount of ethyl acetate, select a certain amount of acrylic resin, stir at a constant speed for 10 minutes, add UV absorber, and continue stirring for 10 minutes;

[0016] S2. Add a quantitative silane coupling agent and continue stirring for 5 minutes;

[0017] S3. Add a quantitative epoxy curing agent and continue stirring for 10 minutes. After coating and drying, a highly UV-resistant explosion-proof film is obtained.

[0018] More optimally, the stirring rate in step S1 is 1200 r / min.

[0019] More optimally, the curing agent accounts for 2% of the total slurry dosage.

[0020] The present invention also provides a method for preparing a high-UV resistant explosion-proof film tape, which is used for the above-mentioned high-UV resistant explosion-proof film tape, comprising the following steps:

[0021] S1, coating 25 μm glue on a transparent PET substrate with a thickness of 50 μm;

[0022] S2, attaching a 125 μm release film to the above PET substrate;

[0023] S3, attaching 28μm PE protective film to the 50μm PET surface;

[0024] S4, placing the explosion-proof film tape in a 40°C constant temperature room for curing for 72 hours to obtain a finished product

[0025] More optimally, the light transmittance of the PET film is 92%.

[0026] More preferably, the content of the UV absorber is 0.3-3%.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0028] (1) In the present invention, the prepared high UV resistant explosion-proof film is stacked from bottom to top in sequence with a release film protective layer, an anti-UV adhesive layer, a substrate layer, and an adhesion enhancing primer layer, which can simultaneously realize the appearance design of the mobile phone back cover and explosion-proof functions.

[0029] (2) In the present invention, by adding a UV absorber to the anti-UV adhesive layer, the UV transmittance can be effectively reduced, thereby protecting the internal components of the mobile phone and extending the service life of the mobile phone.

[0030] (3) In the present invention, the adhesion enhancing 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a high-UV-resistant explosion-proof film tape;

[0033] Figure 2 It is a comparison chart of the test results of the embodiment, comparative example and competing products.

[0034] Among them, 1. Release film; 2. Pressure-sensitive adhesive layer; 3. Base material layer; 4. Adhesion enhancing primer layer; 5. Protective film. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention verifies the performance of the prepared tape through several groups of examples. The specific examples and comparative examples are as follows.

[0037] Embodiment 1:

[0038] like Figure 1A UV-resistant explosion-proof film inside the back cover of a smart display mobile phone comprises a 125μm PET release film protective layer 1, a 25μm UV-resistant adhesive layer 2 containing 3% ultraviolet absorber, a 50μm PET film 3 with a light transmittance of 92%, a 500nm adhesion enhancing primer 4, and a 28μm PE protective film 5 which are stacked in sequence.

[0039] Comparative Example 1

[0040] A UV-resistant explosion-proof film inside the back cover of a smart display mobile phone comprises a 125μm PET release film protective layer 1, a 25μm adhesive layer 2 containing 1% ultraviolet absorber, a 50μm PET film 3 with a light transmittance of 92%, a 500nm adhesion enhancing primer 4, and a 28μm PE protective film 5 which are stacked in sequence.

[0041] Comparative Example 2

[0042] A UV-resistant explosion-proof film inside the back cover of a smart display mobile phone comprises a 125μm PET release film protective layer 1, a 25μm adhesive layer 2 containing 0.3% ultraviolet absorber, a 50μm PET film 3 with a light transmittance of 92%, a 500nm adhesion enhancing primer 4, and a 28μm PE protective film 5 which are stacked in sequence.

[0043] Comparative Example 3

[0044] The invention discloses an explosion-proof film inside the back cover of a UV-resistant smart display mobile phone, comprising a 125 μm PET release film protective layer 1, a 25 μm adhesive layer 2, a 50 μm PET film 3 with a light transmittance of 92%, a 500 nm adhesion enhancing primer 4, and a 28 μm PE protective film 5 which are sequentially stacked.

[0045] The present invention also purchased common explosion-proof films on the market as competing products and verified their performance.

[0046] Performance test: The explosion-proof films prepared in Example 1, Comparative Examples 1-3 and the explosion-proof films of competing products were tested:

[0047] The specific test is to peel off the protective layer of the release film and test the UV transmittance of the explosion-proof film sample, that is, to perform the UV transmittance test using a UV-visible spectrophotometer.

[0048] The test results are as follows Figure 2 shown.

[0049] Depend on Figure 2It can be seen that the transmittance of the explosion-proof film sample prepared in Example 1 begins to increase significantly when the wavelength reaches above 380nm, and reaches 60% at 400nm; while the transmittance of ordinary competing explosion-proof films on the market increases significantly at a wavelength of 360nm, and reaches more than 80% at a wavelength of 380nm. Therefore, it can be seen that the explosion-proof film sample prepared by the present invention has a stronger protection effect against ultraviolet rays of different wavelengths, a lower ultraviolet transmittance, and a better protection effect on mobile phone casings and parts.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly UV resistant explosion-proof film, characterized in that: Includes the following weight components:

2. The high UV resistant explosion-proof film according to claim 1, characterized in that: The curing agent is epoxy resin.

3. The high UV resistant explosion-proof film according to claim 1, characterized in that: The solvent is ethyl acetate.

4. A high UV resistant explosion-proof film tape, made from any one of the high UV resistant explosion-proof films as claimed in claims 1 to 3, characterized in that: It comprises a substrate layer, wherein a pressure-sensitive adhesive layer and a release film layer are sequentially adhered to the top surface of the substrate layer outwardly; an adhesion enhancing primer layer and a protective film are sequentially arranged on the bottom surface of the substrate layer outwardly; and the pressure-sensitive adhesive layer is an anti-UV adhesive layer containing a UV absorber.

5. A method for preparing a highly UV resistant explosion-proof film, used for preparing any one of the highly UV resistant explosion-proof films as claimed in claims 1 to 3, characterized in that: The steps include: S1, prepare glue, add a certain amount of ethyl acetate, select a certain amount of acrylic resin, stir at a constant speed for 10 minutes, add UV absorber, and continue stirring for 10 minutes; S2. Add a quantitative silane coupling agent and continue stirring for 5 minutes; S3. Add a quantitative epoxy curing agent and continue stirring for 10 minutes. After coating and drying, a highly UV-resistant explosion-proof film is obtained. 6 . The method for preparing a highly UV-resistant explosion-proof film according to claim 5 , wherein the stirring rate in step S1 is 1200 r / min. 7 . The method for preparing a highly UV-resistant explosion-proof film according to claim 5 , wherein in step S2 , the curing agent accounts for 2% of the total slurry amount.

8. A method for preparing a highly UV resistant explosion-proof film tape, used for preparing a highly UV resistant explosion-proof film tape as claimed in claim 4, characterized in that: The steps include: S1, coating 25 μm glue on a transparent PET substrate with a thickness of 50 μm; S2, attaching a 125 μm release film to the above PET substrate; S3, attaching 28μm PE protective film to the 50μm PET surface; S4, placing the explosion-proof film tape in a constant temperature chamber at 40° C. for curing for 72 hours to obtain a finished product.

9. The method for preparing a highly UV-resistant explosion-proof film tape according to claim 8, characterized in that: The light transmittance of the PET film is 92%.

10. The method for preparing a highly UV-resistant explosion-proof film tape according to claim 8, characterized in that: The content of the UV absorber is 0.3-3%.

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