AB adhesive film for curved screen and preparation method thereof

Abstract

The present invention relates to the technical field of curved screens, and discloses an AB adhesive film for a curved screen and a preparation method thereof, wherein the AB adhesive film comprises a release film, an adhesive layer, a curved screen substrate, a silicone layer and a protective film; the adhesive layer is bonded to one side of the curved screen substrate, the release film is also bonded to the adhesive layer, the other side of the curved screen substrate is attached to a silicone layer, and the protective film is attached to the silicone layer; the adhesive layer is composed of a component A made of amorphous epoxy resin, and a component B that undergoes a cross-linking reaction with the component A to form an adhesive film; the component A of the adhesive layer also includes a silane coupling agent, a modified polyether surfactant, aerogel particles and a toughening agent; the component B of the adhesive layer includes a polycyclic defoamer, a plasticizer and an antioxidant, and a hardener cross-linked with the component A; the total weight ratio of the component A to the component B is 1:1, and the prepared AB adhesive film has excellent optical transparency, strong plasticity, and can adapt to the shape of the curved screen.

Description

Technical Field

[0001] The present invention relates to the technical field of curved screens, and in particular to an AB adhesive film for a curved screen and a preparation method thereof. Background Art

[0002] With the continuous development of smartphone screens, curved screens (i.e. screens with curved edges) are becoming more and more popular. Curved screens have better visual effects and interactive experience, but they face certain challenges in the process of applying protective films. Traditional protective films are difficult to apply to curved screens, are prone to bubbles, cannot fully adhere to the curve of the screen, or cannot adapt to the slight size differences of the screen, resulting in poor film application and poor user experience.

[0003] Although the AB film products currently on the market work well on flat screens, they often encounter problems such as easy rebound, difficulty in exhausting, and poor tolerance of the film when used on curved screens. These problems greatly affect the application effect and performance of the AB film. Therefore, developing an AB film suitable for curved screens that can solve the above problems has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide an AB adhesive film for curved screens and a preparation method thereof. The AB adhesive film can easily fit the curved screen, has good air-dissipation properties, does not rebound, and has a strong tolerance capability, and can adapt to the size differences of curved screens of different models, thereby improving the overall performance of the mobile phone protective film and the user experience.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] On the one hand, an AB adhesive film for a curved screen is provided, wherein the AB adhesive film comprises a release film, an adhesive layer, a curved screen substrate, a silicone layer and a protective film; the adhesive layer is bonded to one side of the curved screen substrate, the release film is also bonded to the adhesive layer, the other side of the curved screen substrate is attached to a silicone layer, and the protective film is attached to the silicone layer; the adhesive layer is composed of an A component made of amorphous epoxy resin, and a B component that undergoes a cross-linking reaction with the A component to form an adhesive film.

[0007] As a further solution of the present invention, the release film is a polyethylene (PE) film, a polyester (PET) film or a silicone oil treated film with a thickness of 0.01-0.05 mm, which is used to ensure that the surface of the film remains clean and is easily separated from the curved screen substrate during use.

[0008] As a further embodiment of the present invention, the component A of the adhesive layer further comprises a silane coupling agent, a modified polyether surfactant, aerogel particles and a toughening agent; the weight composition of the component A is as follows:

[0009] 40-60 parts of amorphous epoxy resin;

[0010] Silane coupling agent 2-5 parts;

[0011] 1-3 parts of modified polyether surfactant;

[0012] 5-8 parts of aerogel particles;

[0013] 3-5 parts of toughening agent.

[0014] As a further solution of the present invention, the amorphous epoxy resin is an E-44 or E-51 series epoxy resin, which is used to provide basic adhesion and flexibility of the film layer.

[0015] As a further solution of the present invention, the silane coupling agent is γ-aminopropyltriethoxysilane, which is used to enhance the adhesion between component A and the curved screen substrate and improve the bonding strength of the film, especially the adhesion on curved or irregular substrates.

[0016] As a further embodiment of the present invention, the modified polyether surfactant is TEGO-510 modified polyether surfactant in polyether-modified siloxane, which has good air-exhaust performance and fluidity, can effectively reduce the generation of bubbles and improve the smoothness of the film layer.

[0017] As a further solution of the present invention, the aerogel particles are silicon aerogel particles, which have extremely low density and good air permeability, can effectively enhance the air venting of the film and improve the bonding effect, and prevent the generation of bubbles and wrinkles.

[0018] As a further solution of the present invention, the toughening agent is a liquid butyl rubber toughening agent, which is used to improve the toughness and crack resistance of the film layer under impact or pressure.

[0019] As a further embodiment of the present invention, the component B of the adhesive layer includes a polycyclic defoamer, a plasticizer, an antioxidant, and a hardener cross-linked with the component A; the weight composition of the component B is as follows:

[0020] 5-10 parts of polycyclic hardener;

[0021] 1-3 parts of defoaming agent;

[0022] Plasticizer 0.1-0.3 parts;

[0023] Antioxidant 0.5-2 parts.

[0024] As a further solution of the present invention, the total weight ratio of component A to component B is 1:1.

[0025] As a further embodiment of the present invention, the hardener is an aromatic amine or aliphatic amine cross-linked with the A component.

[0026] As a further solution of the present invention, the polycyclic hardener is 4,4'-diaminodiphenylmethane, which is used to improve the cross-linking strength and impact resistance of the adhesive film, and is particularly suitable for the complex bonding of curved screens.

[0027] As a further solution of the present invention, the defoaming agent is a BYK-026 defoaming agent, which can effectively control the bubbles generated by component A during the cross-linking reaction, reduce the defects caused by the bubbles, and ensure a smooth surface of the film layer.

[0028] As a further solution of the present invention, the plasticizer is dioctyl phthalate (DOP), which helps to improve the flexibility and plasticity of the film layer, making it more adaptable to the shape of the curved screen, while not affecting the stability of the film.

[0029] As a further embodiment of the present invention, the antioxidant is Irganox 1010, which can effectively delay the oxidative degradation of the adhesive film, especially in an environment of high temperature or long-term exposure to ultraviolet rays.

[0030] As a further solution of the present invention, the curved screen substrate is made of glass, the silicone layer is organic silicone rubber; and the protective film is a PET film or a polyimide film.

[0031] Another aspect of the present invention provides a method for preparing an AB adhesive film for a curved screen, comprising the following steps:

[0032] Prepare raw materials by weight, pour the weighed amorphous epoxy resin into a clean mixing container, add silane coupling agent and modified polyether surfactant by weight, and add aerogel particles into the mixing container, use mechanical stirring to evenly disperse, then add toughening agent and continue to stir evenly to obtain component A;

[0033] Prepare raw materials by weight, mix component A and component B in a weight ratio of 1:1, first add the weighed defoamer by weight into the container of component B, and stir evenly; add component A to the container, add the plasticizer to the container after preliminary mixing, and add the polycyclic hardener and antioxidant and stir at a low speed until completely and evenly mixed to obtain AB glue;

[0034] Transfer the mixed AB glue solution into a vacuum device for degassing. Degassing is performed for 5-10 minutes in a vacuum environment until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer is obtained.

[0035] Use roller coating to evenly apply the adhesive layer material on the surface of the curved screen substrate to be bonded, and tightly fit the smooth surface of the release film on the surface of the adhesive layer. Use a roller or scraper to gently flatten the release film so that there are no bubbles between the release film and the adhesive layer, and the bonding is even;

[0036] Place the bonding surface of the silicone layer against the quasi-curved screen substrate on the opposite side of the adhesive layer, and use a roller to completely adhere the silicone layer to the back of the curved screen substrate. Then adhere a layer of protective film on the silicone layer. After all layers are bonded, press and cure. The pressurization time is 10-30 minutes, the pressure range is 1-3MPa, the curing temperature is 60℃ to 80℃, and the curing time is 30-60 minutes. After curing, take the film out of the heating equipment and naturally cool to room temperature to obtain an AB film for curved screens.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention provides an AB adhesive film for a curved screen and a preparation method thereof. The prepared AB adhesive film has excellent optical transparency, strong plasticity, and can adapt to the shape of the curved screen. Adding a silane coupling agent to the component A of the adhesive layer can enhance the adhesion between the adhesive film and the curved screen substrate. In particular, on curved or irregularly shaped substrates, the bonding strength of the adhesive film can be effectively improved, thereby ensuring that there will be no peeling or falling off problems during use; using TEGO-510 modified polyether surfactants can improve the fluidity and air discharge of the adhesive film, reduce the generation of bubbles, ensure that the surface of the adhesive film is smooth and uniform, and further enhance its stability; aerogel particles have extremely low density and excellent air permeability, which can effectively enhance the air discharge of the adhesive film, thereby preventing the formation of bubbles during the bonding process, ensuring the smoothness of the adhesive film, and improving the appearance quality of the final product. The vacuum degassing treatment and the roll coating method uniformly apply the adhesive layer to ensure the efficiency and stability of the adhesive film during the production process. The vacuum degassing can completely remove the bubbles in the adhesive liquid to ensure that the surface of the final product is flawless, while the roll coating method can quickly and evenly apply the adhesive liquid on the surface of the curved screen substrate, reducing manual errors and production time. The protective film in the present invention can effectively protect the AB adhesive film from the external environment, reduce the possibility of damage, ensure that the adhesive film maintains excellent appearance and performance for a long time, and enhance the user experience when using the curved screen. The final product can not only ensure a high-quality bonding effect, but also improve the service life and user experience of the curved screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The figure is a schematic structural diagram of an AB adhesive film for a curved screen according to the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0043] Example 1

[0044] The first embodiment of the present invention, see Figure 1 As shown, this embodiment provides an AB adhesive film for a curved screen and a preparation method thereof. The AB adhesive film has high flexibility, air-discharging property and crack resistance, and is particularly suitable for curved or irregularly shaped display screen substrates. The AB adhesive film for a curved screen includes the following components:

[0045] Release film 1: used to protect the surface of the adhesive film, ensure that the surface of the film layer is clean and easy to separate from the curved screen substrate 3. The material of the release film 1 is polyethylene (PE) film, and its thickness is 0.02mm.

[0046] Adhesive layer 2: This layer is composed of component A and component B, and is used to bond the curved screen substrate 3 and the silicone layer 4. Component A is composed of amorphous epoxy resin, silane coupling agent, modified polyether surfactant, aerogel particles and toughening agent; component B contains polycyclic hardener, defoamer, plasticizer and antioxidant.

[0047] Curved screen substrate 3: usually made of glass, its surface has a certain curvature to meet the special requirements of the curved screen.

[0048] Silicone layer 4: usually silicone rubber, located on the back of the curved screen substrate 3, used to increase the flexibility of the structure and buffer impact.

[0049] Protective film 5: A polyimide film is selected to protect the silicone layer 4 from external damage.

[0050] Wherein, the formula of the adhesive layer 2 in the AB adhesive film (in parts by weight):

[0051] Component A:

[0052] Amorphous epoxy resin (E-44): 40 parts;

[0053] Silane coupling agent (γ-aminopropyltriethoxysilane): 2 parts;

[0054] Modified polyether surfactant (TEGO-510): 1 part;

[0055] Aerogel particles (silicon aerogel particles): 5 parts;

[0056] Toughener (liquid butyl rubber toughener): 3 parts;

[0057] Component B:

[0058] Polycyclic hardener (4,4'-diaminodiphenylmethane): 5 parts;

[0059] Defoamer (BYK-026 defoamer): 1 part;

[0060] Plasticizer (dioctyl phthalate DOP): 0.1 part;

[0061] Antioxidant (Irganox 1010): 0.5 parts;

[0062] Among them, the weight ratio of component A to component B is 1:1.

[0063] Component B undergoes a cross-linking reaction with component A to form an adhesive layer 2, and the total weight ratio of component A to component B is 1:1.

[0064] The method for preparing the AB adhesive film for the curved screen comprises the following steps:

[0065] (1) Preparation of component A:

[0066] Add amorphous epoxy resin (E-44) to a clean mixing container and weigh an appropriate amount;

[0067] Add silane coupling agent (γ-aminopropyltriethoxysilane) and modified polyether surfactant (TEGO-510) to epoxy resin and stir evenly;

[0068] Add aerogel particles (silicon aerogel particles) and continue stirring to ensure that the particles are evenly dispersed;

[0069] Add toughening agent (liquid butyl rubber toughening agent) and continue stirring until component A is completely uniform.

[0070] (2) Preparation of component B:

[0071] Weigh the polycyclic hardener (4,4'-diaminodiphenylmethane) and add it to the B component container; add the defoamer (BYK-026) and stir well to remove bubbles; add the plasticizer (dioctyl phthalate DOP) and antioxidant (Irganox 1010) and stir well.

[0072] (3) Mixing of component A and component B:

[0073] The prepared component A and component B are mixed in a weight ratio of 1:1; component A is first added to component B and stirred evenly; the mixed AB glue solution is poured into a vacuum device for degassing. Degassing is performed in a vacuum environment for 10 minutes until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer 2 is obtained.

[0074] (4) Applying adhesive layer 2:

[0075] Use roller coating to evenly apply the degassed AB glue solution to the surface of the curved screen substrate 3 to be bonded; fit the smooth surface of the release film 1 tightly onto the surface of the adhesive layer 2, and use a roller or scraper to gently flatten the release film 1 to ensure that there are no bubbles between the release film 1 and the adhesive layer 2, and that the bonding is even.

[0076] (5) Laminating silicone layer 4:

[0077] Align the bonding surface of the silicone layer 4 with the back side of the curved screen substrate 3, and use a pressure roller to completely adhere the silicone layer 4 to the curved screen substrate 3; adhere a layer of protective film 5 on the silicone layer 4 to ensure its integrity; after all layers are bonded, press and cure; the pressurization time is 30 minutes, the pressure range is 1MPa; the curing temperature is 60°C, and the curing time is 45 minutes; after curing, take the film out of the heating device and cool it naturally to room temperature; the final AB film for curved screens is obtained.

[0078] Performance Test:

[0079] Bond strength test: Refer to ISO 4587:2012 "Plastics - Determination of tensile bond strength of plastic adhesives" standard for bond strength test. Test steps: Clean the bonding surface between the curved screen and the AB film, remove surface dirt and grease, apply the AB film by roller coating, and place it in a constant temperature environment to cure for 30 minutes. After the film coating is completed, use a universal force machine to apply uniform tension to the joint surface. During the test, the cured AB film sample is cut into a standard tensile specimen (a specimen with a width of 10mm and a length of 30mm), and the specimen is fixed in the two clamps of the tensile machine. It is stretched at a constant tensile rate (1mm / min) until the bonding surface is peeled off, and the maximum tensile force and tensile strength at break are recorded. The results show that the bonding strength of the AB film for the curved screen is 4.5MPa, which meets the requirements of high bonding performance and is significantly higher than the 2-3MPa level of ordinary films. The bonding strength is significantly better than ordinary films.

[0080] Bendability test: Refer to ISO 178:2019 "Plastics-Bending Test Method", the test steps are: prepare the cured AB film sample, apply the AB film on the curved screen and cure it, and prepare a film sample with a certain thickness (0.3mm). The test process is: use a bending test device (three-point bending tester) to apply a gradually increasing bending force. The bending angle can be set through the adjustment device in the device. The target bending angle is 90°. During the test, observe whether the film is cracked, peeled or deformed. The results show that the film did not show any cracks or fall off during the 90° bending test, proving that the film has excellent flexibility. This performance is better than conventional film materials on the market and meets the requirements for the bonding of curved screens.

[0081] Bubble detection test: refer to ISO 11357-2:2013 "Plastics - Differential Scanning Calorimetry (DSC)", the test steps are: vacuum degassing the AB glue for 10 minutes before coating to ensure that there are no bubbles on the surface. When coating the AB glue, the glue should be uniform to avoid bubbles. The test process is: use an optical microscope to check the surface of the cured film to observe whether there are bubbles, and use a surface defect detector to scan the surface of the coated film to check whether the surface is flat and free of bubbles. The results show that the surface of the AB film is smooth, no bubbles were found after testing, and the exhaust is excellent, with excellent exhaust properties.

[0082] UV aging test: refer to ASTM G154-21 "Plastic Accelerated UV Aging Test Standard", the test steps are: expose the AB film cured sample to UV radiation for accelerated aging, use UV accelerated aging test equipment to simulate the solar radiation environment. The test process is: place the sample in the UV aging test box, select a UV lamp with a specific wavelength (UV-B, wavelength 280-315nm) for irradiation; set the irradiation intensity to 0.7W / m 2 ·nm, irradiation time is 400 hours, simulating long-term use conditions. The results show that after 400 hours of UV aging, the AB film did not show obvious yellowing, cracking or decreased bonding performance, and the film showed strong UV resistance.

[0083] Hardness test: Refer to ISO 2039-1:2018 "Plastics - Hardness test methods - Rockwell hardness determination". The test steps are: cut the cured AB film into test pieces that meet the standard size (20mm diameter discs). The test process is: use a Rockwell hardness tester to test the hardness of the sample, select the Rockwell hardness scale (HRB scale), and test according to the standard. The results show that the measured hardness is HRB 60, which meets the requirements of high scratch resistance.

[0084] Wear resistance test: Referring to ISO 9352:2008 "Plastics - Wear Test Methods - Taber Wear Test", the cured AB film samples were cut into circular samples with a diameter of 100mm, and tested using a Taber wear tester. The wear weight of the test wheel (CS-10) was set to 500g, and a wear test was performed for 1000 revolutions, and the wear of the sample surface was recorded. The results showed that the friction coefficient was 0.4, and there was no obvious wear or scratches on the surface of the tested sample.

[0085] The data table is as follows:

[0086]

[0087] The above test results show that the prepared AB film has excellent performance in terms of bonding strength, flexibility, bubble removal, UV tolerance, hardness and wear resistance, and is particularly suitable for the bonding and protection of curved screens. All test results meet the expected standards and are superior to conventional materials, ensuring the high quality and wide application prospects of the product.

[0088] Example 2

[0089] The first embodiment of the present invention, see Figure 1 As shown, this embodiment provides an AB adhesive film for a curved screen and a preparation method thereof. The AB adhesive film has high flexibility, air-discharging property and crack resistance, and is particularly suitable for curved or irregularly shaped display screen substrates. The AB adhesive film for a curved screen includes the following components:

[0090] Release film 1: used to protect the surface of the adhesive film, ensure that the surface of the film layer is clean and easy to separate from the curved screen substrate 3. The material of the release film 1 is a polyester (PET) film with a thickness of 0.03 mm.

[0091] Adhesive layer 2: This layer is composed of component A and component B, and is used to bond the curved screen substrate 3 and the silicone layer 4. Component A is composed of amorphous epoxy resin, silane coupling agent, modified polyether surfactant, aerogel particles and toughening agent; component B contains polycyclic hardener, defoamer, plasticizer and antioxidant.

[0092] Curved screen substrate 3: usually made of glass, its surface has a certain curvature to meet the special requirements of the curved screen.

[0093] Silicone layer 4: usually silicone rubber, located on the back of the curved screen substrate 3, used to increase the flexibility of the structure and buffer impact.

[0094] Protective film 5: A PET film is selected to protect the silicone layer 4 from external damage.

[0095] Wherein, the formula of the adhesive layer 2 in the AB adhesive film (in parts by weight):

[0096] Component A:

[0097] Amorphous epoxy resin (E-51): 50 parts;

[0098] Silane coupling agent (γ-aminopropyltriethoxysilane): 3 parts;

[0099] Modified polyether surfactant (TEGO-510): 2 parts;

[0100] Aerogel particles (silicon aerogel particles): 7 parts;

[0101] Toughener (liquid butyl rubber toughener): 4 parts;

[0102] Component B:

[0103] Polycyclic hardener (4,4'-diaminodiphenylmethane): 8 parts;

[0104] Defoamer (BYK-026 defoamer): 2 parts;

[0105] Plasticizer (dioctyl phthalate DOP): 0.2 parts;

[0106] Antioxidant (Irganox 1010): 1.5 parts;

[0107] Among them, the weight ratio of component A to component B is 1:1.

[0108] Component B undergoes a cross-linking reaction with component A to form an adhesive layer 2, and the total weight ratio of component A to component B is 1:1.

[0109] The method for preparing the AB adhesive film for the curved screen comprises the following steps:

[0110] (1) Preparation of component A:

[0111] Add amorphous epoxy resin (E-51) to a clean mixing container and weigh an appropriate amount;

[0112] Add silane coupling agent (γ-aminopropyltriethoxysilane) and modified polyether surfactant (TEGO-510) to epoxy resin and stir evenly;

[0113] Add aerogel particles (silicon aerogel particles) and continue stirring to ensure that the particles are evenly dispersed;

[0114] Add toughening agent (liquid butyl rubber toughening agent) and continue stirring until component A is completely uniform.

[0115] (2) Preparation of component B:

[0116] Weigh the polycyclic hardener (4,4'-diaminodiphenylmethane) and add it to the B component container; add the defoamer (BYK-026) and stir well to remove bubbles; add the plasticizer (dioctyl phthalate DOP) and antioxidant (Irganox 1010) and stir well.

[0117] (3) Mixing of component A and component B:

[0118] The prepared component A and component B are mixed in a weight ratio of 1:1; component A is first added to component B and stirred evenly; the mixed AB glue solution is poured into a vacuum device for degassing. Degassing is performed for 8 minutes in a vacuum environment until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer 2 is obtained.

[0119] (4) Applying adhesive layer 2:

[0120] Use roller coating to evenly apply the degassed AB glue solution to the surface of the curved screen substrate 3 to be bonded; fit the smooth surface of the release film 1 tightly onto the surface of the adhesive layer 2, and use a roller or scraper to gently flatten the release film 1 to ensure that there are no bubbles between the release film 1 and the adhesive layer 2, and that the bonding is even.

[0121] (5) Laminating silicone layer 4:

[0122] Align the bonding surface of the silicone layer 4 with the back side of the curved screen substrate 3, and use a pressure roller to completely adhere the silicone layer 4 to the curved screen substrate 3; adhere a layer of protective film 5 on the silicone layer 4 to ensure its integrity; after all layers are bonded, press and cure; the pressurization time is 20 minutes, the pressure range is 2MPa; the curing temperature is 60°C, and the curing time is 60 minutes; after curing, take the film out of the heating equipment and cool it naturally to room temperature; the final AB film for curved screens is obtained.

[0123] Performance Test:

[0124] Bond strength test: Refer to ISO 4587:2012 "Plastics - Determination of tensile bond strength of plastic adhesives" standard for bond strength test. Test steps: Clean the bonding surface between the curved screen and the AB film, remove surface dirt and grease, apply the AB film by roller coating, and place it in a constant temperature environment to cure for 30 minutes. After the film coating is completed, use a universal force machine to apply uniform tension to the joint surface. During the test, the cured AB film sample is cut into a standard tensile specimen (a specimen with a width of 10mm and a length of 30mm), and the specimen is fixed in the two clamps of the tensile machine. It is stretched at a constant tensile rate (1mm / min) until the bonding surface is peeled off, and the maximum tensile force and tensile strength at break are recorded. The results show that the bonding strength of the AB film for the curved screen is 4.2MPa, which meets the requirements of high bonding performance and is significantly higher than the 2-3MPa level of ordinary films. The bonding strength is significantly better than ordinary films.

[0125] Bendability test: Refer to ISO 178:2019 "Plastics-Bending Test Method", the test steps are: prepare the cured AB film sample, apply the AB film on the curved screen and cure it, and prepare a film sample with a certain thickness (0.3mm). The test process is: use a bending test device (three-point bending tester) to apply a gradually increasing bending force. The bending angle can be set through the adjustment device in the device. The target bending angle is 90°. During the test, observe whether the film is cracked, peeled or deformed. The results show that the film did not show any cracks or fall off during the 90° bending test, proving that the film has excellent flexibility. This performance is better than conventional film materials on the market and meets the requirements for the bonding of curved screens.

[0126] Bubble detection test: refer to ISO 11357-2:2013 "Plastics - Differential Scanning Calorimetry (DSC)", the test steps are: vacuum degassing the AB glue for 10 minutes before coating to ensure that there are no bubbles on the surface. When coating the AB glue, the glue should be uniform to avoid bubbles. The test process is: use an optical microscope to check the surface of the cured film to observe whether there are bubbles, and use a surface defect detector to scan the surface of the coated film to check whether the surface is flat and free of bubbles. The results show that the surface of the AB film is smooth, no bubbles were found after testing, and the exhaust is excellent, with excellent exhaust properties.

[0127] UV aging test: refer to ASTM G154-21 "Plastic Accelerated UV Aging Test Standard", the test steps are: expose the AB film cured sample to UV radiation for accelerated aging, use UV accelerated aging test equipment to simulate the solar radiation environment. The test process is: place the sample in the UV aging test box, select a UV lamp with a specific wavelength (UV-B, wavelength 280-315nm) for irradiation; set the irradiation intensity to 0.7W / m 2 ·nm, irradiation time is 400 hours, simulating long-term use conditions. The results show that after 400 hours of UV aging, the AB film did not show obvious yellowing, cracking or decreased bonding performance, and the film showed strong UV resistance.

[0128] Hardness test: Refer to ISO 2039-1:2018 "Plastics - Hardness test methods - Rockwell hardness determination". The test steps are: cut the cured AB film into test pieces that meet the standard size (20mm diameter discs). The test process is: use a Rockwell hardness tester to test the hardness of the sample, select the Rockwell hardness scale (HRB scale), and test according to the standard. The results show that the measured hardness is HRB 58, which meets the requirements of high scratch resistance.

[0129] Wear resistance test: Referring to ISO 9352:2008 "Plastics - Wear Test Methods - Taber Wear Test", the cured AB film samples were cut into circular samples with a diameter of 100mm, and tested using a Taber wear tester. The wear weight of the test wheel (CS-10) was set to 500g, and a wear test was performed for 1000 revolutions, and the wear of the sample surface was recorded. The results showed that the friction coefficient was 0.38, and there was no obvious wear or scratches on the surface of the tested sample.

[0130] The data table is as follows:

[0131]

[0132]

[0133] The above test results show that the prepared AB film has excellent performance in terms of bonding strength, flexibility, bubble removal, UV tolerance, hardness and wear resistance, and is particularly suitable for the bonding and protection of curved screens. All test results meet the expected standards and are superior to conventional materials, ensuring the high quality and wide application prospects of the product.

[0134] Example 3

[0135] The first embodiment of the present invention, see Figure 1As shown, this embodiment provides an AB adhesive film for a curved screen and a preparation method thereof. The AB adhesive film has high flexibility, air-discharging property and crack resistance, and is particularly suitable for curved or irregularly shaped display screen substrates. The AB adhesive film for a curved screen includes the following components:

[0136] Release film 1: used to protect the surface of the adhesive film, ensure that the surface of the film layer is clean and easy to separate from the curved screen substrate 3. The material of the release film 1 is polyethylene (PE) film, and its thickness is 0.05mm.

[0137] Adhesive layer 2: This layer is composed of component A and component B, and is used to bond the curved screen substrate 3 and the silicone layer 4. Component A is composed of amorphous epoxy resin, silane coupling agent, modified polyether surfactant, aerogel particles and toughening agent; component B contains polycyclic hardener, defoamer, plasticizer and antioxidant.

[0138] Curved screen substrate 3: usually made of glass, its surface has a certain curvature to meet the special requirements of the curved screen.

[0139] Silicone layer 4: usually silicone rubber, located on the back of the curved screen substrate 3, used to increase the flexibility of the structure and buffer impact.

[0140] Protective film 5: A PET film is selected to protect the silicone layer 4 from external damage.

[0141] Wherein, the formula of the adhesive layer 2 in the AB adhesive film (in parts by weight):

[0142] Component A:

[0143] Amorphous epoxy resin (E-44): 50 parts;

[0144] Silane coupling agent (γ-aminopropyltriethoxysilane): 4 parts;

[0145] Modified polyether surfactant (TEGO-510): 2 parts;

[0146] Aerogel particles (silicon aerogel particles): 7 parts;

[0147] Toughener (liquid butyl rubber toughener): 3 parts;

[0148] Component B:

[0149] Polycyclic hardener (4,4'-diaminodiphenylmethane): 6 parts;

[0150] Defoamer (BYK-026 defoamer): 1.5 parts;

[0151] Plasticizer (dioctyl phthalate DOP): 0.2 parts;

[0152] Antioxidant (Irganox 1010): 0.5 parts;

[0153] Among them, the weight ratio of component A to component B is 1:1.

[0154] Component B undergoes a cross-linking reaction with component A to form an adhesive layer 2, and the total weight ratio of component A to component B is 1:1.

[0155] The method for preparing the AB adhesive film for the curved screen comprises the following steps:

[0156] (1) Preparation of component A:

[0157] Add amorphous epoxy resin (E-44) to a clean mixing container and weigh an appropriate amount;

[0158] Add silane coupling agent (γ-aminopropyltriethoxysilane) and modified polyether surfactant (TEGO-510) to epoxy resin and stir evenly;

[0159] Add aerogel particles (silicon aerogel particles) and continue stirring to ensure that the particles are evenly dispersed;

[0160] Add toughening agent (liquid butyl rubber toughening agent) and continue stirring until component A is completely uniform.

[0161] (2) Preparation of component B:

[0162] Weigh the polycyclic hardener (4,4'-diaminodiphenylmethane) and add it to the B component container; add the defoamer (BYK-026) and stir well to remove bubbles; add the plasticizer (dioctyl phthalate DOP) and antioxidant (Irganox 1010) and stir well.

[0163] (3) Mixing of component A and component B:

[0164] The prepared component A and component B are mixed in a weight ratio of 1:1; component A is first added to component B and stirred evenly; the mixed AB glue solution is poured into a vacuum device for degassing. Degassing is performed in a vacuum environment for 5 minutes until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer 2 is obtained.

[0165] (4) Applying adhesive layer 2:

[0166] Use roller coating to evenly apply the degassed AB glue solution to the surface of the curved screen substrate 3 to be bonded; fit the smooth surface of the release film 1 tightly onto the surface of the adhesive layer 2, and use a roller or scraper to gently flatten the release film 1 to ensure that there are no bubbles between the release film 1 and the adhesive layer 2, and that the bonding is even.

[0167] (5) Laminating silicone layer 4:

[0168] Align the bonding surface of the silicone layer 4 with the back side of the curved screen substrate 3, and use a pressure roller to completely adhere the silicone layer 4 to the curved screen substrate 3; adhere a layer of protective film 5 on the silicone layer 4 to ensure its integrity; after all layers are bonded, press and cure; the pressurization time is 30 minutes, the pressure range is 1MPa; the curing temperature is 80°C, and the curing time is 30 minutes; after curing, take the film out of the heating equipment and cool it naturally to room temperature; the final AB film for curved screens is obtained.

[0169] Performance Test:

[0170] Bond strength test: Refer to ISO 4587:2012 "Plastics - Determination of tensile bond strength of plastic adhesives" standard for bond strength test. Test steps: Clean the bonding surface between the curved screen and the AB film, remove surface dirt and grease, apply the AB film by roller coating, and place it in a constant temperature environment to cure for 30 minutes. After the film coating is completed, use a universal force machine to apply uniform tension to the joint surface. During the test, the cured AB film sample is cut into a standard tensile specimen (a specimen with a width of 10mm and a length of 30mm), and the specimen is fixed in the two clamps of the tensile machine. It is stretched at a constant tensile rate (1mm / min) until the bonding surface is peeled off, and the maximum tensile force and tensile strength at break are recorded. The results show that the bonding strength of the AB film for the curved screen is 3.9MPa, which meets the requirements of high bonding performance and is significantly higher than the 2-3MPa level of ordinary films. The bonding strength is significantly better than ordinary films.

[0171] Bendability test: Refer to ISO 178:2019 "Plastics-Bending Test Method", the test steps are: prepare the cured AB film sample, apply the AB film on the curved screen and cure it, and prepare a film sample with a certain thickness (0.3mm). The test process is: use a bending test device (three-point bending tester) to apply a gradually increasing bending force. The bending angle can be set through the adjustment device in the device. The target bending angle is 90°. During the test, observe whether the film is cracked, peeled or deformed. The results show that the film did not show any cracks or fall off during the 90° bending test, proving that the film has excellent flexibility. This performance is better than conventional film materials on the market and meets the requirements for the bonding of curved screens.

[0172] Bubble detection test: refer to ISO 11357-2:2013 "Plastics - Differential Scanning Calorimetry (DSC)", the test steps are: vacuum degassing the AB glue for 10 minutes before coating to ensure that there are no bubbles on the surface. When coating the AB glue, the glue should be uniform to avoid bubbles. The test process is: use an optical microscope to check the surface of the cured film to observe whether there are bubbles, and use a surface defect detector to scan the surface of the coated film to check whether the surface is flat and free of bubbles. The results show that the surface of the AB film is smooth, no bubbles were found after testing, and the exhaust is excellent, with excellent exhaust properties.

[0173] UV aging test: refer to ASTM G154-21 "Plastic Accelerated UV Aging Test Standard", the test steps are: expose the AB film cured sample to UV radiation for accelerated aging, use UV accelerated aging test equipment to simulate the solar radiation environment. The test process is: place the sample in the UV aging test box, select a UV lamp with a specific wavelength (UV-B, wavelength 280-315nm) for irradiation; set the irradiation intensity to 0.7W / m 2 ·nm, irradiation time is 400 hours, simulating long-term use conditions. The results show that after 400 hours of UV aging, the AB film did not show obvious yellowing, cracking or decreased bonding performance, and the film showed strong UV resistance.

[0174] Hardness test: Refer to ISO 2039-1:2018 "Plastics - Hardness test methods - Rockwell hardness determination". The test steps are: cut the cured AB film into test pieces that meet the standard size (20mm diameter discs). The test process is: use a Rockwell hardness tester to test the hardness of the sample, select the Rockwell hardness scale (HRB scale), and test according to the standard. The results show that the measured hardness is HRB 55, which meets the requirements of high scratch resistance.

[0175] Wear resistance test: Referring to ISO 9352:2008 "Plastics - Wear Test Methods - Taber Wear Test", the cured AB film samples were cut into circular samples with a diameter of 100mm, and tested using a Taber wear tester. The wear weight of the test wheel (CS-10) was set to 500g, and a wear test was performed for 1000 revolutions. The wear of the sample surface was recorded. The results showed that the friction coefficient was 0.45, and there was no obvious wear or scratches on the surface of the tested sample.

[0176] The data table is as follows:

[0177]

[0178] The above test results show that the prepared AB film has excellent performance in terms of bonding strength, flexibility, bubble removal, UV tolerance, hardness and wear resistance, and is particularly suitable for the bonding and protection of curved screens. All test results meet the expected standards and are superior to conventional materials, ensuring the high quality and wide application prospects of the product.

[0179] Example 4

[0180] The first embodiment of the present invention, see Figure 1 As shown, this embodiment provides an AB adhesive film for a curved screen and a preparation method thereof. The AB adhesive film has high flexibility, air-discharging property and crack resistance, and is particularly suitable for curved or irregularly shaped display screen substrates. The AB adhesive film for a curved screen includes the following components:

[0181] Release film 1: used to protect the surface of the adhesive film, ensure that the surface of the film layer is clean and easy to separate from the curved screen substrate 3. The material of the release film 1 is a silicone oil treated film with a thickness of 0.01 mm.

[0182] Adhesive layer 2: This layer is composed of component A and component B, and is used to bond the curved screen substrate 3 and the silicone layer 4. Component A is composed of amorphous epoxy resin, silane coupling agent, modified polyether surfactant, aerogel particles and toughening agent; component B contains polycyclic hardener, defoamer, plasticizer and antioxidant.

[0183] Curved screen substrate 3: usually made of glass, its surface has a certain curvature to meet the special requirements of the curved screen.

[0184] Silicone layer 4: usually silicone rubber, located on the back of the curved screen substrate 3, used to increase the flexibility of the structure and buffer impact.

[0185] Protective film 5: A polyimide film is selected to protect the silicone layer 4 from external damage.

[0186] Wherein, the formula of the adhesive layer 2 in the AB adhesive film (in parts by weight):

[0187] Component A:

[0188] Amorphous epoxy resin (E-44): 60 parts;

[0189] Silane coupling agent (γ-aminopropyltriethoxysilane): 5 parts;

[0190] Modified polyether surfactant (TEGO-510): 3 parts;

[0191] Aerogel particles (silicon aerogel particles): 8 parts;

[0192] Toughener (liquid butyl rubber toughener): 5 parts;

[0193] Component B:

[0194] Polycyclic hardener (4,4'-diaminodiphenylmethane): 10 parts;

[0195] Defoamer (BYK-026 defoamer): 1 part;

[0196] Plasticizer (dioctyl phthalate DOP): 0.3 parts;

[0197] Antioxidant (Irganox 1010): 2 parts;

[0198] Among them, the weight ratio of component A to component B is 1:1.

[0199] Component B undergoes a cross-linking reaction with component A to form an adhesive layer 2, and the total weight ratio of component A to component B is 1:1.

[0200] The method for preparing the AB adhesive film for the curved screen comprises the following steps:

[0201] (1) Preparation of component A:

[0202] Add amorphous epoxy resin (E-44) to a clean mixing container and weigh an appropriate amount;

[0203] Add silane coupling agent (γ-aminopropyltriethoxysilane) and modified polyether surfactant (TEGO-510) to epoxy resin and stir evenly;

[0204] Add aerogel particles (silicon aerogel particles) and continue stirring to ensure that the particles are evenly dispersed;

[0205] Add toughening agent (liquid butyl rubber toughening agent) and continue stirring until component A is completely uniform.

[0206] (2) Preparation of component B:

[0207] Weigh the polycyclic hardener (4,4'-diaminodiphenylmethane) and add it to the B component container; add the defoamer (BYK-026) and stir well to remove bubbles; add the plasticizer (dioctyl phthalate DOP) and antioxidant (Irganox 1010) and stir well.

[0208] (3) Mixing of component A and component B:

[0209] The prepared component A and component B are mixed in a weight ratio of 1:1; component A is first added to component B and stirred evenly; the mixed AB glue solution is poured into a vacuum device for degassing. Degassing is performed in a vacuum environment for 5 minutes until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer 2 is obtained.

[0210] (4) Applying adhesive layer 2:

[0211] Use roller coating to evenly apply the degassed AB glue solution to the surface of the curved screen substrate 3 to be bonded; fit the smooth surface of the release film 1 tightly onto the surface of the adhesive layer 2, and use a roller or scraper to gently flatten the release film 1 to ensure that there are no bubbles between the release film 1 and the adhesive layer 2, and that the bonding is even.

[0212] (5) Laminating silicone layer 4:

[0213] Align the bonding surface of the silicone layer 4 with the back side of the curved screen substrate 3, and use a pressure roller to completely adhere the silicone layer 4 to the curved screen substrate 3; adhere a layer of protective film 5 on the silicone layer 4 to ensure its integrity; after all layers are bonded, press and cure; the pressurization time is 10 minutes, the pressure range is 3MPa; the curing temperature is 70°C, and the curing time is 50 minutes; after curing, take the film out of the heating equipment and cool it naturally to room temperature; the final AB film for curved screens is obtained.

[0214] Performance Test:

[0215] Bond strength test: Refer to ISO 4587:2012 "Plastics - Determination of tensile bond strength of plastic adhesives" standard for bond strength test. Test steps: Clean the bonding surface between the curved screen and the AB film, remove surface dirt and grease, apply the AB film by roller coating, and place it in a constant temperature environment to cure for 30 minutes. After the film coating is completed, use a universal force machine to apply uniform tension to the joint surface. During the test, the cured AB film sample is cut into a standard tensile specimen (a specimen with a width of 10mm and a length of 30mm), and the specimen is fixed in the two clamps of the tensile machine. It is stretched at a constant tensile rate (1mm / min) until the bonding surface is peeled off, and the maximum tensile force and tensile strength at break are recorded. The results show that the bonding strength of the AB film for the curved screen is 4.0MPa, which meets the requirements of high bonding performance and is significantly higher than the 2-3MPa level of ordinary films. The bonding strength is significantly better than ordinary films.

[0216] Bendability test: Refer to ISO 178:2019 "Plastics-Bending Test Method", the test steps are: prepare the cured AB film sample, apply the AB film on the curved screen and cure it, and prepare a film sample with a certain thickness (0.3mm). The test process is: use a bending test device (three-point bending tester) to apply a gradually increasing bending force. The bending angle can be set through the adjustment device in the device. The target bending angle is 90°. During the test, observe whether the film is cracked, peeled or deformed. The results show that the film did not show any cracks or fall off during the 90° bending test, proving that the film has excellent flexibility. This performance is better than conventional film materials on the market and meets the requirements for the bonding of curved screens.

[0217] Bubble detection test: refer to ISO 11357-2:2013 "Plastics - Differential Scanning Calorimetry (DSC)", the test steps are: vacuum degassing the AB glue for 10 minutes before coating to ensure that there are no bubbles on the surface. When coating the AB glue, the glue should be uniform to avoid bubbles. The test process is: use an optical microscope to check the surface of the cured film to observe whether there are bubbles, and use a surface defect detector to scan the surface of the coated film to check whether the surface is flat and free of bubbles. The results show that the surface of the AB film is smooth, no bubbles were found after testing, and the exhaust is excellent, with excellent exhaust properties.

[0218] UV aging test: refer to ASTM G154-21 "Plastic Accelerated UV Aging Test Standard", the test steps are: expose the AB film cured sample to UV radiation for accelerated aging, use UV accelerated aging test equipment to simulate the solar radiation environment. The test process is: place the sample in the UV aging test box, select a UV lamp with a specific wavelength (UV-B, wavelength 280-315nm) for irradiation; set the irradiation intensity to 0.7W / m 2 ·nm, irradiation time is 400 hours, simulating long-term use conditions. The results show that after 400 hours of UV aging, the AB film did not show obvious yellowing, cracking or decreased bonding performance, and the film showed strong UV resistance.

[0219] Hardness test: Refer to ISO 2039-1:2018 "Plastics - Hardness test methods - Rockwell hardness determination". The test steps are: cut the cured AB film into test pieces that meet the standard size (20mm diameter discs). The test process is: use a Rockwell hardness tester to test the hardness of the sample, select the Rockwell hardness scale (HRB scale), and test according to the standard. The results show that the measured hardness is HRB 62, which meets the requirements of high scratch resistance.

[0220] Wear resistance test: Referring to ISO 9352:2008 "Plastics - Wear Test Methods - Taber Wear Test", the cured AB film samples were cut into circular samples with a diameter of 100mm, and tested using a Taber wear tester. The wear weight of the test wheel (CS-10) was set to 500g, and a wear test was performed for 1000 revolutions, and the wear of the sample surface was recorded. The results showed that the friction coefficient was 0.42, and the surface performance of the tested sample was good, with excellent surface wear resistance.

[0221] The data table is as follows:

[0222]

[0223] From the above test results, it can be seen that the bonding strength of Example 1 is the highest, reaching 4.5MPa, indicating that the formula has very strong bonding performance and is suitable for high-demand curved screen bonding. All examples did not crack or fall off in the bending test, indicating that the film has good flexibility. Examples 1, 2, 3 and 4 all performed well in terms of bubble removal, completely free of bubbles, meeting the requirements of high-quality coating, and performed excellently under ultraviolet irradiation. Examples 1, 2, 3 and 4 did not change color or crack, indicating that the defoaming agent is very effective. The hardness of Example 4 reached HRB 62 and performed the strongest, which is suitable for curved screens requiring high scratch resistance. All examples showed good wear resistance, and the friction coefficient was less than 0.5, meeting the requirements of high durability. Therefore, the prepared AB film showed excellent performance in terms of bonding strength, flexibility, bubble removal, ultraviolet tolerance, hardness and wear resistance, and was particularly suitable for the bonding and protection of curved screens. All test results met the expected standards and were better than conventional materials, ensuring the high quality and wide application prospects of the products.

[0224] In summary, through the above four embodiments, it can be clearly seen that the AB adhesive film for curved screens of the present invention has excellent optical transparency, strong plasticity, and adapts to the shape of the curved screen. The use of high-transparency epoxy resin and the addition of a hardener ensures the transparency of the adhesive film without affecting the display effect of the curved screen. It can also effectively prevent ultraviolet damage to the curved screen and extend the service life of the screen. The addition of a hardener makes the adhesive film have good scratch resistance and wear resistance, protecting the curved screen from external damage. The prepared AB adhesive film has good plasticity and flexibility, can adapt to the curved shape of the curved screen, ensure complete coverage of the screen, and will not affect the performance of the adhesive film due to deformation. It is suitable for various curved screen displays, such as smart phones, tablet computers, televisions, electronic glasses, car displays, etc., and has broad application prospects.

[0225] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0226] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0227] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0228] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An AB adhesive film for a curved screen, characterized in that: The AB adhesive film includes a release film, an adhesive layer, a curved screen substrate, a silicone layer and a protective film; the adhesive layer is bonded to one side of the curved screen substrate, and the release film is also bonded to the adhesive layer; the other side of the curved screen substrate is attached to a silicone layer, and the protective film is attached to the silicone layer; the adhesive layer is composed of an A component made of amorphous epoxy resin, and a B component that undergoes a cross-linking reaction with the A component to form an adhesive film.

2. The AB adhesive film for curved screen according to claim 1, characterized in that: The release film is a polyethylene film, a polyester film or a silicone oil treated film, and has a thickness of 0.01-0.05 mm.

3. The AB adhesive film for curved screen according to claim 2, characterized in that: Component A of the adhesive layer also includes a silane coupling agent, a modified polyether surfactant, aerogel particles and a toughening agent; the weight composition of component A is as follows: 40-60 parts of amorphous epoxy resin; Silane coupling agent 2-5 parts; 1-3 parts of modified polyether surfactant; 5-8 parts of aerogel particles; 3-5 parts of toughening agent.

4. The AB adhesive film for curved screen according to claim 3, characterized in that: The amorphous epoxy resin is an E-44 or E-51 series epoxy resin; the silane coupling agent is γ-aminopropyltriethoxysilane; and the modified polyether surfactant is TEGO-510 modified polyether surfactant in polyether-modified siloxane.

5. The AB adhesive film for curved screen according to claim 3, characterized in that: The aerogel particles are silicon aerogel particles; and the toughening agent is a liquid butyl rubber toughening agent.

6. The AB adhesive film for curved screen according to claim 1, characterized in that: The component B of the adhesive layer includes a polycyclic defoamer, a plasticizer, an antioxidant, and a hardener cross-linked with the component A; the weight composition of the component B is as follows: 5-10 parts of polycyclic hardener; 1-3 parts of defoaming agent; Plasticizer 0.1-0.3 parts; Antioxidant 0.5-2 parts.

7. The AB adhesive film for curved screen according to claim 6, characterized in that: The total weight ratio of the A component to the B component is 1:1; the hardener is an aromatic amine or aliphatic amine cross-linked with the A component.

8. The AB adhesive film for curved screen according to claim 7, characterized in that: The polycyclic hardener is 4,4'-diaminodiphenylmethane, the defoamer is BYK-026 defoamer, the plasticizer is dioctyl phthalate; and the antioxidant is Irganox 1010.

9. The AB adhesive film for curved screen according to claim 1, characterized in that: The curved screen substrate is made of glass, the silicone layer is organic silicone rubber; and the protective film is a PET film or a polyimide film.

10. A method for preparing an AB adhesive film for a curved screen according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: Prepare the raw materials by weight, pour the weighed amorphous epoxy resin into a clean mixing container, Add silane coupling agent and modified polyether surfactant according to weight, and add aerogel particles into a mixing container, and after uniformly dispersing by mechanical stirring, add toughening agent and continue to stir uniformly to obtain component A; Prepare raw materials by weight, mix component A and component B in a weight ratio of 1:1, first add the weighed defoamer by weight into the container of component B, and stir evenly; add component A to the container, add the plasticizer to the container after preliminary mixing, and add the polycyclic hardener and antioxidant and stir at a low speed until completely and evenly mixed to obtain AB glue; Transfer the mixed AB glue solution into a vacuum device for degassing. Degassing is performed for 5-10 minutes in a vacuum environment until there are no bubbles on the surface of the glue solution, and a degassed adhesive layer is obtained. Use roller coating to evenly apply the adhesive layer material on the surface of the curved screen substrate to be bonded, and tightly fit the smooth surface of the release film on the surface of the adhesive layer. Use a roller or scraper to gently flatten the release film so that there are no bubbles between the release film and the adhesive layer, and the bonding is even; Place the bonding surface of the silicone layer against the quasi-curved screen substrate on the opposite side of the adhesive layer, and use a roller to completely adhere the silicone layer to the back of the curved screen substrate. Then adhere a layer of protective film on the silicone layer. After all layers are bonded, press and cure. The pressurization time is 10-30 minutes, the pressure range is 1-3MPa, the curing temperature is 60℃ to 80℃, and the curing time is 30-60 minutes. After curing, take the film out of the heating equipment and cool it naturally to room temperature to obtain an AB film for curved screens.

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