A photothermal conversion type residue-free peeling process protective film

Abstract

The utility model provides a kind of photothermal conversion type no residue peeling process protective film, it is related to protective film technical field, including base film;The base film is made of PET material, with good optical performance and mechanical properties, the lower inside position of base film is provided with photothermal conversion coating, and photothermal conversion coating contains nano metal oxide and carbon nanometer material photothermal conversion agent, the lower inside position of photothermal conversion coating is provided with adhesive layer, and adhesive layer uses acrylate heat-sensitive type bonding material.The cooperation of photothermal conversion coating and acrylate heat-sensitive type bonding material, photothermal conversion coating absorbs light energy and converts into heat energy, so that the temperature of adhesive layer increases, and the adhesion decreases, residue peeling is realized, and the influence of glue residue on PMMA organic glass screen appearance and display effect is avoided.The existing protective film is prone to leave glue residue on the surface of PMMA organic glass during peeling, which affects the screen appearance and display effect.

Description

Technical Field

[0001] This utility model belongs to the field of protective film technology, and more specifically, it relates to a photothermal conversion type protective film with no residue peeling process. Background Technology

[0002] With the widespread use of smartphones, screen protection has become crucial. Currently, the outer layer of smartphone screens often uses PMMA (polymethyl methacrylate) acrylic glass, which has good optical properties but is easily scratched, worn, and contaminated. Existing protective films have some problems during use, such as leaving adhesive residue on the PMMA acrylic glass surface when peeled off, affecting the screen's appearance and display effect; or having insufficient adhesion, making them easy to fall off and failing to provide effective protection. Therefore, a new type of protective film is needed to solve these problems.

[0003] Application No. CN202022100673.8 discloses an AB adhesive suitable for PC-PMMA film and a protective film suitable for curved screens. The AB adhesive comprises, in sequence, a release film, a low-tack silicone layer, a flexible substrate layer, an OCA layer, a PET substrate layer, a high-tack silicone layer, and a release film. The flexible substrate layer is any one of PVC film, TPU film, TPH film, and PE film, and its thickness is 20–80 μm. The OCA layer is a photocurable polyacrylic acid resin adhesive layer with a thickness of 100–300 μm and a Shore A hardness of 0–1A. The high-tack silicone layer is a silicone resin adhesive layer with a thickness of 10–40 μm and a peel force of 800–2000 gf / 25 mm. The AB adhesive and its protective film disclosed in this invention, suitable for PC-PMMA film, do not produce bubble points after lamination with the PC-PMMA film, can pass stringent environmental tests, and exhibit high weather resistance.

[0004] Based on the above patent search and understanding of the application of existing protective films: With the popularization of smartphones, the PMMA organic glass commonly used on the outer layer of mobile phone screens has good optical performance, but it is easily scratched, worn and contaminated. Existing protective films have many problems. When peeling them off, they are easy to leave glue residue on the surface of PMMA organic glass, which affects the appearance and display effect of the screen. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides a photothermal conversion type protective film with a residue-free peeling process, which solves the problem that existing protective films easily leave adhesive residue on the surface of PMMA acrylic glass during peeling, affecting the screen's appearance and display effect.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A photothermal conversion type residue-free peeling protective film includes a base film; the base film is made of PET material and has good optical and mechanical properties; a photothermal conversion coating is disposed on the lower inner side of the base film, the photothermal conversion coating contains nano-metal oxide and carbon nanomaterial photothermal conversion agent; an adhesive layer is disposed on the lower inner side of the photothermal conversion coating, the adhesive layer is made of acrylic heat-sensitive adhesive material, and the adhesive layer is bonded to the top surface of PMMA organic glass.

[0008] According to one embodiment of the present invention, the base film has a thickness of 40±10μm.

[0009] According to one embodiment of the present invention, the thickness of the photothermal conversion coating is 4.5μm-5μm.

[0010] According to one embodiment of the present invention, the thickness of the adhesive layer is 5μm-6μm.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The base film is made of PET material, which has advantages such as high transparency, low haze, good flexibility and tensile strength, providing a stable support structure for the protective film and ensuring the overall performance and service life of the protective film.

[0013] The thicknesses of the base film, photothermal conversion coating, and adhesive layer were reasonably limited. The base film thickness was 40±10μm, balancing strength and flexibility. The photothermal conversion coating thickness was 4.5μm-5μm, which could effectively absorb light energy to generate sufficient heat to regulate the adhesive layer's viscosity. The adhesive layer thickness was 5μm-6μm, ensuring adhesion at room temperature and rapidly reducing viscosity when heated, making it easy to detach.

[0014] The adhesive layer has good adhesion at room temperature, which can firmly fix the protective film to the PMMA acrylic glass, ensuring that the protective film will not easily fall off during normal use, and providing stable and reliable protection for the mobile phone screen.

[0015] By combining a photothermal conversion coating with an acrylic heat-sensitive adhesive, the photothermal conversion coating absorbs light energy and converts it into heat energy, which raises the temperature of the adhesive layer, reduces the adhesion, and achieves residue-free peeling, thus avoiding the impact of glue residue on the appearance and display effect of the PMMA organic glass screen. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall main view of this utility model.

[0017] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0018] 1. Base film; 2. Photothermal conversion coating; 3. Adhesive layer; 4. PMMA acrylic glass. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The use of terms such as "a," "an," or "the" in this utility model patent application specification and claims does not indicate a quantity limitation, but rather indicates the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0022] Example:

[0023] As attached Figure 1 As shown:

[0024] This invention provides a photothermal conversion type residue-free peeling protective film, including a base film 1. The base film 1 is made of PET material, which has good optical and mechanical properties. PET material has advantages such as high transparency, low haze, good flexibility and tensile strength, and can provide a stable support structure for the protective film. A photothermal conversion coating 2 is provided on the lower inner side of the base film 1. The photothermal conversion coating 2 contains nano-metal oxides and carbon nanomaterials as photothermal conversion agents. The nano-metal oxides include titanium dioxide and zinc oxide, and the carbon nanomaterials include carbon nanotubes and graphene, which have excellent photothermal conversion performance and can convert absorbed light energy into heat energy.

[0025] An adhesive layer 3 is provided on the inner side below the photothermal conversion coating 2. The adhesive layer 3 is made of acrylic heat-sensitive adhesive material. The adhesive layer 3 adheres to the top surface of the PMMA organic glass 4. The adhesive layer 3 has good adhesion at room temperature and can firmly fix the protective film on the PMMA organic glass 4. When the photothermal conversion coating 2 absorbs light and generates heat, causing the temperature to rise, the adhesion of the adhesive layer 3 decreases, making it easy to peel off without residue.

[0026] The base film 1 has a thickness of 40±10μm. This thickness range ensures that the base film 1 has sufficient strength while maintaining a certain degree of flexibility, making it easy to process and use.

[0027] The photothermal conversion coating 2 has a thickness of 4.5μm-5μm. Within this thickness range, the photothermal conversion coating 2 can effectively absorb light energy and generate sufficient heat to control the adhesion of the adhesive layer 3.

[0028] The adhesive layer 3 has a thickness of 5μm-6μm. This thickness ensures that the adhesive layer 3 has sufficient adhesion at room temperature, and at the same time, it can quickly reduce the stickiness under photothermal conversion, so that the adhesive layer 3 can quickly detach from the top surface of the PMMA organic glass 4.

[0029] When using:

[0030] A suitable PET material was selected, and a base film 1 with a thickness of 40±10μm was prepared by extrusion, stretching and other processes. During the preparation process, the process parameters were strictly controlled to ensure that the optical and mechanical properties of the base film 1 met the requirements.

[0031] A coating liquid containing nano-metal oxides and carbon nanomaterial photothermal conversion agents is uniformly coated on the inner surface below the base film 1 using a coating process. The coating process can be carried out by methods such as scraping or spraying. After coating, the coating is dried and cured to form a photothermal conversion coating 2 with a thickness of 4.5μm-5μm.

[0032] An acrylic heat-sensitive adhesive material is coated onto the inner surface below the photothermal conversion coating 2 using a coating process to form an adhesive layer 3 with a thickness of 5μm-6μm. After coating, appropriate drying and curing treatments are performed to ensure the adhesive performance of the adhesive layer 3.

[0033] Although this application has been described with reference to the foregoing embodiments, those skilled in the art will understand that various changes can be made without departing from the spirit and scope of this application as defined by the appended claims. While this specification contains details of many specific implementations, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular embodiments. The scope of this application is defined by the appended claims and their equivalents, and is not limited to the embodiments described above.

Claims

1. A photothermal conversion type residue-free peeling protective film, characterized in that: Includes a base film (1); the base film (1) is made of PET material and has good optical and mechanical properties. A photothermal conversion coating (2) is provided on the lower inner side of the base film (1). The photothermal conversion coating (2) contains nano metal oxide and carbon nanomaterial photothermal conversion agent. An adhesive layer (3) is provided on the lower inner side of the photothermal conversion coating (2). The adhesive layer (3) is made of acrylic heat-sensitive adhesive material. The adhesive layer (3) is bonded to the top surface of PMMA organic glass (4).

2. The photothermal conversion type residue-free peeling protective film as described in claim 1, characterized in that: The base film (1) has a thickness of 40±10μm.

3. The photothermal conversion type residue-free peeling protective film as described in claim 1, characterized in that: The photothermal conversion coating (2) has a thickness of 4.5μm-5μm.

4. The photothermal conversion type residue-free peeling protective film as described in claim 1, characterized in that: The thickness of the adhesive layer (3) is 5μm-6μm.

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