Folding impact-resistant protective film and folding impact-resistant protective patch
By adding PET or SRF layers as intermediate layers in the folded impact-resistant protective film, the problem of slow imprinting and rebound recovery during impact is solved, and higher impact resistance and better rebound recovery effect are achieved, extending service life.
Patent Information
- Application Number
- CN202421709379.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The existing folding impact-resistant protective film is prone to scratches such as imprints and pits when impacted by external forces, and the rebound recovery time is slow, and the impact resistance cannot meet the growing requirements of high impact resistance.
An intermediate layer is added between the first pressure-sensitive adhesive layer and the buffer layer that folds the impact-resistant protective film, which is a PET layer or an SRF layer, enhancing the impact resistance and rebound recovery ability of the film.
The impact resistance and rebound recovery effect of the folded impact protection film are improved, the service life is extended, and the optical performance is improved.
Smart Images
Figure CN222948288U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of protective films, and in particular to a foldable impact-resistant protective film and a foldable impact-resistant protective sticker. Background Art
[0002] In order to protect the screens of electronic products such as mobile phones, computers, and televisions from scratches, most users now put protective films on the screens of such electronic products for protection. Foldable electronic products are widely loved by users because they can meet the needs of users for large screen sizes and avoid the inconvenience of carrying caused by large screen sizes. Therefore, the demand for foldable protective films is also increasing.
[0003] The folding protective film is generally composed of a hardened layer and a pressure-sensitive adhesive layer stacked along the thickness direction. In order to improve the impact resistance of the folding protective film, a buffer layer (for example, the material is thermoplastic polyurethane elastomer, i.e. TPU) is added to the laminated structure of the folding protective film to form a folding impact-resistant protective film composed of a hardened layer, a pressure-sensitive adhesive layer, a buffer layer and a pressure-sensitive adhesive layer stacked in sequence along the thickness direction.
[0004] However, the above method will cause the folding anti-impact protective film to easily have scratches such as embossing and pitting when it is impacted by external force, and the folding anti-impact protective film has a slow rebound recovery time after being impacted by external force. In addition, the impact resistance of the current folding anti-impact protective film cannot meet the growing high impact resistance requirements. Utility Model Content
[0005] The purpose of the present application is to provide a folding impact-resistant protective film and a folding impact-resistant protective sticker, which are intended to improve the impact resistance and rebound recovery ability of the folding protective film, thereby increasing the service life of the folding impact-resistant protective film.
[0006] In a first aspect, the present application provides a foldable impact-resistant protective film, which includes: a hardening layer, a first pressure-sensitive adhesive layer, an intermediate layer, a buffer layer and a second pressure-sensitive adhesive layer stacked in sequence along the thickness direction; the intermediate layer is a PET layer or an SRF layer.
[0007] The present application can not only enhance the impact resistance of the folding impact-resistant protective film, but also make the folding impact-resistant protective film have better rebound recovery effect by adding an intermediate layer (i.e., a PET layer or an SRF layer) between the first pressure-sensitive adhesive layer and the buffer layer in the folding impact-resistant protective film, thereby helping to increase the service life of the folding impact-resistant protective film.
[0008] In combination with the first aspect, in an optional embodiment of the present application, the thickness of the intermediate layer is 10 μm to 40 μm; or / and, the transmittance of the intermediate layer is greater than 90%; or / and, the haze of the intermediate layer is less than 1.5%.
[0009] In the above technical solution, the thickness of the middle layer is 10μm to 40μm, which can make the folded impact-resistant protective film have high impact resistance, rebound recovery effect and resistance to bending and fracture; the transmittance of the middle layer is greater than 90%, or / and the haze of the middle layer is less than 1.5%, which can make the folded impact-resistant protective film have better optical properties and improve the user's visual experience.
[0010] In combination with the first aspect, in an optional embodiment of the present application, the buffer layer is a TPU layer; or / and, the thickness of the buffer layer is 15 μm to 35 μm; or / and, the Young's modulus of the buffer layer is 50 MPa to 500 MPa.
[0011] The above technical solution can make the folded impact-resistant protective film have better impact resistance.
[0012] In combination with the first aspect, in an optional implementation manner of the present application, the first pressure-sensitive adhesive layer is an OCA layer; or / and, the thickness of the first pressure-sensitive adhesive layer is 10 μm to 30 μm.
[0013] In the above technical solution, the first pressure-sensitive adhesive layer is an OCA layer, which has the advantages of high light transmittance, low haze and high adhesion, which can make the folded impact-resistant protective film have better optical properties and also make the folded impact-resistant protective film with a laminated structure have higher structural stability.
[0014] In combination with the first aspect, in an optional implementation manner of the present application, the second pressure-sensitive adhesive layer is an OCA layer; or / and, the thickness of the second pressure-sensitive adhesive layer is 10 μm to 50 μm.
[0015] In the above technical solution, the second pressure-sensitive adhesive layer is an OCA layer, which has the advantages of high light transmittance, low haze and high adhesion, which can make the folded impact-resistant protective film have better optical properties and also make the folded impact-resistant protective film with a laminated structure have higher structural stability.
[0016] In combination with the first aspect, in an optional embodiment of the present application, the hardened layer includes a hardened functional layer and a hardened base film layer stacked along the thickness direction, and the hardened functional layer is located on the side of the hardened base film layer away from the first pressure-sensitive adhesive layer; the hardened base film layer is a PET layer or an SRF layer; the hardness of the hardened functional layer is >2H / 1000g.
[0017] In the above technical solution, the hardened layer has high mechanical strength and can improve the mechanical properties of the folded impact-resistant protective film.
[0018] In combination with the first aspect, in an optional embodiment of the present application, the thickness of the hardened functional layer is 2 μm to 5 μm; or / and the thickness of the hardened base film layer is 20 μm to 80 μm.
[0019] In combination with the first aspect, in an optional embodiment of the present application, the peeling force between the first pressure-sensitive adhesive layer and the hardened layer is greater than 1000gf / 25mm; or / and, the peeling force between the first pressure-sensitive adhesive layer and the intermediate layer is greater than 1000gf / 25mm; or / and, the peeling force between the second pressure-sensitive adhesive layer and the buffer layer is greater than 1000gf / 25mm.
[0020] The above technical solution can make the folding anti-impact protective film with a laminated structure have higher structural stability and increase the service life of the folding anti-impact protective film.
[0021] In a second aspect, the present application provides a foldable impact-resistant protective sticker, which comprises: a protective layer, a release film layer, and the foldable impact-resistant protective film provided in any one of the first aspects. The protective layer, the foldable impact-resistant protective film, and the release film layer are stacked in sequence along the thickness direction, and the protective layer is located on the side of the hardening layer away from the first pressure-sensitive adhesive layer, and the release film layer is located on the side of the second pressure-sensitive adhesive layer away from the buffer layer.
[0022] In combination with the second aspect, in an optional embodiment of the present application, the thickness of the release film layer is 25μm to 80μm; or / and, the protective film includes a protective base film layer and a third pressure-sensitive adhesive layer, the protective base film layer is located on the side of the third pressure-sensitive adhesive layer away from the folding impact-resistant protective film, the thickness of the protective base film layer is 25μm to 80μm, and the thickness of the third pressure-sensitive adhesive layer is 5μm to 15μm. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 This is a schematic diagram of the structure of the foldable impact-resistant protective sticker provided in this application.
[0025] Figure 2 A schematic diagram of the structure of the foldable impact-resistant protective film provided in this application.
[0026] Icon: 100-protective layer; 110-protective base film layer; 120-third pressure-sensitive adhesive layer; 200-release film layer; 300-folded impact-resistant protective film; 310-hardening layer; 311-hardening functional layer; 312-hardening base film layer; 320-first pressure-sensitive adhesive layer; 330-middle layer; 340-buffer layer; 350-second pressure-sensitive adhesive layer. DETAILED DESCRIPTION
[0027] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.
[0029] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0031] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms such as "thickness" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply 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 on the embodiments of the present application.
[0032] The present application provides a foldable impact-resistant protective sticker. Figure 1 For the structural diagram of the foldable impact-resistant protective sticker provided for this application, please refer to Figure 1 The foldable impact-resistant protective film includes a protective layer 100, a release film layer 200 and a foldable impact-resistant protective film 300 which are stacked in sequence, and the protective layer 100, the foldable impact-resistant protective film 300 and the release film layer 200 are stacked in sequence along the thickness direction.
[0033] When using the foldable impact-resistant protective film provided in the present application, it is necessary to peel off the protective layer 100 and the release film layer 200 from the foldable impact-resistant protective film 300 respectively, and make the side of the foldable impact-resistant protective film 300 in contact with the release film layer 200 adhere to the screen of the electronic product, so as to realize the protective effect of the foldable impact-resistant protective film 300 on the screen of the electronic product.
[0034] Figure 2 For a schematic diagram of the structure of the foldable impact-resistant protective film 300 provided in this application, please refer to Figure 1 and Figure 2 The folded impact-resistant protective film 300 includes: a hardening layer 310, a first pressure-sensitive adhesive layer 320, an intermediate layer 330, a buffer layer 340, and a second pressure-sensitive adhesive layer 350 stacked in sequence along the thickness direction. The protective layer 100 is located on a side of the hardening layer 310 away from the first pressure-sensitive adhesive layer 320, and the release film layer 200 is located on a side of the second pressure-sensitive adhesive layer 350 away from the buffer layer 340.
[0035] In the present application, the middle layer 330 is a PET (polyethylene terephthalate) layer or a SRF (super refractory polyester film) layer.
[0036] The present application adds an intermediate layer 330 (i.e., a PET layer or an SRF layer) between the first pressure-sensitive adhesive layer 320 and the buffer layer 340 in the folded impact-resistant protective film 300, which can not only enhance the impact resistance of the folded impact-resistant protective film 300, but also enable the folded impact-resistant protective film 300 to have a better rebound recovery effect, thereby helping to increase the service life of the folded impact-resistant protective film 300.
[0037] In some optional embodiments of the present application, the thickness of the intermediate layer 330 is 10 μm to 40 μm; the thickness of the intermediate layer 330 is within the above thickness range, so that the folded impact-resistant protective film 300 can have high impact resistance, rebound recovery effect and anti-bending and fracture performance.
[0038] As an example, the thickness of the intermediate layer 330 may be any one of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm and 40 μm, or a range of values between any two of them.
[0039] In some optional embodiments of the present application, the transmittance of the middle layer 330 is greater than 90%, which can make the folded anti-impact protective film 300 have better optical properties and improve the visual experience of the user.
[0040] By way of example, the transmittance of the intermediate layer 330 may be 90.1%, 90.5%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or higher.
[0041] In some optional embodiments of the present application, the haze of the middle layer 330 is less than 1.5%, which can make the folded anti-impact protective film 300 have better optical properties and improve the visual experience of the user.
[0042] By way of example, the haze of the intermediate layer 330 may be 1.4%, 1.3%, 1.2%, 1.1%, 1.0%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5% or less.
[0043] In some optional embodiments of the present application, the buffer layer 340 is a TPU (thermoplastic polyurethane elastomer) layer, which can make the folded impact-resistant protective film 300 have better impact resistance.
[0044] In some optional embodiments of the present application, the thickness of the buffer layer 340 is 15 μm to 35 μm, which can make the folded anti-impact protective film 300 have better impact resistance.
[0045] As an example, the thickness of the buffer layer 340 may be any one of 15 μm, 17 μm, 20 μm, 22 μm, 25 μm, 27 μm, 30 μm, 32 μm and 35 μm, or a range of values between any two of them.
[0046] In some optional embodiments of the present application, the Young's modulus of the buffer layer 340 is 50 MPa to 500 MPa, which can make the folded anti-impact protective film 300 have better impact resistance.
[0047] As an example, the Young's modulus of the buffer layer 340 may be any one of 50 MPa, 100 MPa, 150 MPa, 200 MPa, 250 MPa, 300 MPa, 350 MPa, 400 MPa, 450 MPa and 500 MPa, or a range of values between any two of them.
[0048] In some optional embodiments of the present application, the first pressure-sensitive adhesive layer 320 is an OCA (Optically Clear Adhesive) layer. The OCA material has the advantages of high light transmittance, low haze and high adhesion, which can make the folded impact-resistant protective film 300 have better optical properties and also make the laminated structure of the folded impact-resistant protective film 300 have higher structural stability.
[0049] Furthermore, in some optional embodiments of the present application, the thickness of the first pressure-sensitive adhesive layer 320 is 10 μm to 30 μm.
[0050] As an example, the thickness of the first pressure-sensitive adhesive layer 320 may be any one of 10 μm, 12 μm, 15 μm, 17 μm, 20 μm, 22 μm, 25 μm, 27 μm and 30 μm, or a range between any two of them.
[0051] In some optional embodiments of the present application, the second pressure-sensitive adhesive layer 350 is an OCA layer. The OCA material has the advantages of high light transmittance, low haze and high adhesion, which can make the folding impact-resistant protective film 300 have better optical properties and also make the folding impact-resistant protective film 300 with a laminated structure have higher structural stability.
[0052] Furthermore, in some optional embodiments of the present application, the thickness of the second pressure-sensitive adhesive layer 350 is 10 μm to 50 μm.
[0053] As an example, the thickness of the second pressure-sensitive adhesive layer 350 may be any one of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm and 50 μm, or a range between any two of the values.
[0054] In some optional embodiments of the present application, the hardened layer 310 includes a hardened functional layer 311 and a hardened base film layer 312 stacked along the thickness direction, and the hardened functional layer 311 is located on the side of the hardened base film layer 312 away from the first pressure-sensitive adhesive layer 320 .
[0055] Furthermore, in some optional embodiments of the present application, the hardened base film layer 312 is a PET layer or a SRF layer.
[0056] In some optional embodiments of the present application, the thickness of the hardened base film layer 312 is 20 μm to 80 μm.
[0057] As an example, the thickness of the hardened base film layer 312 may be any one of 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm and 80 μm, or a range value between any two of them.
[0058] In some optional embodiments of the present application, the hardness of the hardened functional layer 311 is greater than 2H / 1000g; the hardened layer 310 has a high mechanical strength, which can improve the mechanical properties of the folded impact-resistant protective film 300.
[0059] It should be noted that the present application does not limit the material of the hardened functional layer 311 , and the existing conventional hardened functional layer 311 material can be used. For example, the hardened functional layer 311 can be a HC (Hard Coating) layer.
[0060] In some optional embodiments of the present application, the thickness of the hardening functional layer 311 is 2 μm to 5 μm.
[0061] As an example, the thickness of the hardening functional layer 311 may be any one of 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm and 5 μm, or a range of values between any two of them.
[0062] In order to make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, in some optional embodiments of the present application, the peeling force between the first pressure-sensitive adhesive layer 320 and the hardening layer 310 is greater than 1000gf / 25mm; the above method can make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, thereby improving the service life of the folding impact-resistant protective film 300.
[0063] In addition, in order to make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, in some optional embodiments of the present application, the peeling force between the first pressure-sensitive adhesive layer 320 and the intermediate layer 330 is greater than 1000gf / 25mm; the above method can make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, thereby improving the service life of the folding impact-resistant protective film 300.
[0064] In order to make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, in some optional embodiments of the present application, the peeling force between the second pressure-sensitive adhesive layer 350 and the buffer layer 340 is greater than 1000gf / 25mm; the above method can make the folding impact-resistant protective film 300 of the laminated structure have a higher structural stability, thereby improving the service life of the folding impact-resistant protective film 300.
[0065] See also Figure 1 In the present application, the release film layer 200 is located on the side of the second pressure-sensitive adhesive layer 350 away from the buffer layer 340. In some optional embodiments of the present application, the thickness of the release film layer 200 is 25 μm to 80 μm.
[0066] As an example, the thickness of the release film layer 200 may be any one of 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm and 80 μm, or a range of values between any two of them.
[0067] In some optional embodiments of the present application, the peeling force between the release film layer 200 and the second pressure-sensitive adhesive layer 350 is less than 10gf / 25mm, which can facilitate the separation of the release film layer 200 from the folded impact-resistant protective film 300 and facilitate the use of the folded impact-resistant protective film.
[0068] As an example, the release film layer 200 is a silicon-based release film, for example, the release film layer 200 may be a single silicon release film.
[0069] In the present application, the protective layer 100 is located on the side of the hardening layer 310 away from the first pressure-sensitive adhesive layer 320. In some optional embodiments of the present application, the protective film includes a protective base film layer 110 and a third pressure-sensitive adhesive layer 120, and the protective base film layer 110 is located on the side of the third pressure-sensitive adhesive layer 120 away from the folded impact-resistant protective film 300.
[0070] Furthermore, in some optional embodiments of the present application, the thickness of the protective base film layer 110 is 25 μm to 80 μm.
[0071] As an example, the thickness of the protective base film layer 110 may be any one of 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm and 80 μm, or a range value between any two of them.
[0072] As an example, the protective base film layer 110 is a PET layer.
[0073] Furthermore, in some optional embodiments of the present application, the thickness of the third pressure-sensitive adhesive layer 120 is 5 μm to 15 μm.
[0074] As an example, the thickness of the third pressure-sensitive adhesive layer 120 may be any one of 5 μm, 7 μm, 10 μm, 12 μm, and 15 μm, or a range of values between any two of them.
[0075] As an example, the third pressure-sensitive adhesive layer 120 is an acrylic adhesive layer or a silicone adhesive layer.
[0076] The present application also provides a foldable impact-resistant protective film 300, such as Figure 2 As shown, the folded impact-resistant protective film 300 includes: a hardening layer 310, a first pressure-sensitive adhesive layer 320, an intermediate layer 330, a buffer layer 340, and a second pressure-sensitive adhesive layer 350 stacked in sequence along the thickness direction. The protective layer 100 is located on the side of the hardening layer 310 away from the first pressure-sensitive adhesive layer 320, and the release film layer 200 is located on the side of the second pressure-sensitive adhesive layer 350 away from the buffer layer 340. The intermediate layer 330 is a PET layer or an SRF layer.
[0077] It should be noted that the materials and related parameters of the hardening layer 310 , the first pressure-sensitive adhesive layer 320 , the middle layer 330 , the buffer layer 340 and the second pressure-sensitive adhesive layer 350 are described above and will not be repeated here.
[0078] Example 1
[0079] This embodiment provides a foldable impact-resistant protective sticker, such as Figure 1 As shown, it comprises a protective layer 100, a folded anti-impact protective film 300 and a release film layer 200 which are sequentially stacked along the thickness direction.
[0080] The protective layer includes a protective base film layer 110 and a third pressure-sensitive adhesive layer 120 stacked in a thickness direction.
[0081] The folded impact-resistant protective film 300 comprises a hardening layer 310, a first pressure-sensitive adhesive layer 320, an intermediate layer 330, a buffer layer 340 and a second pressure-sensitive adhesive layer 350 stacked in a thickness direction; the hardening layer 310 comprises a hardening functional layer 311 and a hardening base film layer 312 stacked in a thickness direction.
[0082] In the foldable impact-resistant protective film, the protective base film layer 110, the third pressure-sensitive adhesive layer 120, the hardened functional layer 311, the hardened base film layer 312, the first pressure-sensitive adhesive layer 320, the middle layer 330, the buffer layer 340, the second pressure-sensitive adhesive layer 350 and the release film layer 200 are stacked in sequence.
[0083] The protective base film layer 110 has a thickness of 50 μm and is made of PET.
[0084] The third pressure-sensitive adhesive layer 120 has a thickness of 10 μm and is made of silicone.
[0085] The thickness of the hardening functional layer 311 is 3 μm.
[0086] The thickness of the hardened base film layer 312 is 50 μm, and the material is PET.
[0087] The first pressure-sensitive adhesive layer 320 has a thickness of 25 μm and is made of OCA.
[0088] The thickness of the middle layer 330 is 15 μm and the material is PET.
[0089] The buffer layer 340 has a thickness of 30 μm and is made of TPU.
[0090] The second pressure-sensitive adhesive layer 350 has a thickness of 25 μm and is made of OCA.
[0091] The thickness of the release film layer 200 is 50 μm.
[0092] Example 2
[0093] This embodiment provides a foldable impact-resistant protective sticker. The difference between Embodiment 2 and Embodiment 1 is that the material of the middle layer 330 in Embodiment 1 is replaced by SRF instead of PET.
[0094] Comparative Example
[0095] This comparative example provides a foldable impact-resistant protective sticker, and the comparative example is different from Example 1 only in that the comparative example does not have the intermediate layer 330 .
[0096] Experimental example
[0097] The folded impact-resistant protective films of Examples 1 to 2 and the comparative example were subjected to impact resistance test and rebound recovery ability test. The test results are shown in Table 1.
[0098] Among them, the impact resistance test is carried out in accordance with ASTM D56282010; the specific steps are as follows: peel off the release film layer in the folding impact-resistant protective film, stick the side of the folding impact-resistant protective film in contact with the release film layer on the tempered glass plate (thickness of 0.5mm), and then peel off the protective layer from the folding impact-resistant protective film; place a small steel ball (diameter of 10mm, weight of 4g) above the tempered glass plate, so that the small steel ball falls freely, and "when the tempered glass plate cracks, the height of the small steel ball from the upper surface of the folding impact-resistant protective film before it falls" is used as the critical impact resistance height; the higher the critical impact resistance height, the better the impact resistance of the folding impact-resistant protective film.
[0099] The specific steps of the rebound recovery ability test are as follows: peel off the release film layer in the folding impact-resistant protective film, stick the side of the folding impact-resistant protective film that is in contact with the release film layer on the mobile phone screen, and then peel off the protective layer from the folding impact-resistant protective film; use a force of 2H / 500g to perform a scratch test on the upper surface of the folding impact-resistant protective film, observe the scratches and scratch degree on the upper surface of the folding impact-resistant protective film and the recovery time of the scratches; the shorter the recovery time of the scratches, the better the rebound recovery ability of the folding impact-resistant protective film.
[0100] Table 1
[0101] Critical height of impact resistance (cm) Scratch test results Example 1 130 No scratches, slight scratches, scratches recovered within 10 seconds Example 2 125 No scratches, slight scratches, scratches recovered in 20 seconds Comparative Example 100 No scratches, heavy scratches, scratches recovered in 60s
[0102] It can be seen from Table 1 that adding a PET layer or an SRF layer between the first pressure-sensitive adhesive layer and the buffer layer in the folded impact-resistant protective film can not only enhance the impact resistance of the folded impact-resistant protective film, but also make the folded impact-resistant protective film have a better rebound recovery effect.
[0103] In summary, the foldable impact-resistant protective film of the present application includes a hardening layer, a first pressure-sensitive adhesive layer, an intermediate layer, a buffer layer and a second pressure-sensitive adhesive layer stacked in sequence along the thickness direction, wherein the intermediate layer is a PET layer or an SRF layer. The present application not only enhances the impact resistance of the foldable impact-resistant protective film by adding an intermediate layer (i.e., a PET layer or an SRF layer) between the first pressure-sensitive adhesive layer and the buffer layer in the foldable impact-resistant protective film, but also enables the foldable impact-resistant protective film to have a better rebound recovery effect, thereby facilitating the improvement of the service life of the foldable impact-resistant protective film.
[0104] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A foldable impact-resistant protective film, characterized in that: include: The hardening layer, the first pressure-sensitive adhesive layer, the intermediate layer, the buffer layer and the second pressure-sensitive adhesive layer are sequentially stacked in the thickness direction. Wherein, the middle layer is a PET layer or a SRF layer.
2. The folded impact-resistant protective film according to claim 1, characterized in that: The thickness of the intermediate layer is 10 μm to 40 μm; Or / and, the transmittance of the intermediate layer is greater than 90%; Or / and, the haze of the intermediate layer is less than 1.5%.
3. The folded impact-resistant protective film according to claim 1 or 2, characterized in that: The buffer layer is a TPU layer; Or / and, the thickness of the buffer layer is 15 μm to 35 μm; Or / and, the Young's modulus of the buffer layer is 50 MPa to 500 MPa.
4. The folded impact-resistant protective film according to claim 1 or 2, characterized in that: The first pressure-sensitive adhesive layer is an OCA layer; Or / and, the thickness of the first pressure-sensitive adhesive layer is 10 μm to 30 μm.
5. The folded impact-resistant protective film according to claim 1 or 2, characterized in that: The second pressure-sensitive adhesive layer is an OCA layer; Or / and, the thickness of the second pressure-sensitive adhesive layer is 10 μm to 50 μm.
6. The folded impact-resistant protective film according to claim 1 or 2, characterized in that: The hardened layer comprises a hardened functional layer and a hardened base film layer stacked along the thickness direction, and the hardened functional layer is located on a side of the hardened base film layer away from the first pressure-sensitive adhesive layer; The hardened base film layer is a PET layer or a SRF layer; The hardness of the hardened functional layer is greater than 2H / 1000g.
7. The folded impact-resistant protective film according to claim 6, characterized in that: The thickness of the hardened functional layer is 2 μm to 5 μm; Or / and, the thickness of the hardened base film layer is 20 μm to 80 μm.
8. The folded impact-resistant protective film according to claim 1 or 2, characterized in that: The peeling force between the first pressure-sensitive adhesive layer and the hardened layer is greater than 1000 gf / 25 mm; or / and, the peeling force between the first pressure-sensitive adhesive layer and the intermediate layer is greater than 1000 gf / 25 mm; Or / and, the peeling force between the second pressure-sensitive adhesive layer and the buffer layer is greater than 1000 gf / 25 mm.
9. A foldable impact-resistant protective sticker, characterized in that: include: A protective layer, a release film layer, and a folded impact-resistant protective film according to any one of claims 1 to 8; The protective layer, the folded anti-impact protective film and the release film layer are stacked in sequence along the thickness direction, and the protective layer is located on the side of the hardening layer away from the first pressure-sensitive adhesive layer, and the release film layer is located on the side of the second pressure-sensitive adhesive layer away from the buffer layer.
10. The foldable impact-resistant protective sticker according to claim 9, characterized in that: The thickness of the release film layer is 25 μm to 80 μm; Or / and, the protective film includes a protective base film layer and a third pressure-sensitive adhesive layer, the protective base film layer is located on the side of the third pressure-sensitive adhesive layer away from the folded impact-resistant protective film; the thickness of the protective base film layer is 25μm to 80μm, and the thickness of the third pressure-sensitive adhesive layer is 5μm to 15μm.