Explosion-resistant impact-resistant ultrathin flexible glass, preparation method thereof and display module

Abstract

The invention provides anti-explosion impact-resistant ultra-thin flexible glass and a preparation method thereof. The ultra-thin flexible glass comprises an ultra-thin glass layer, the first buffer layer is located on the surface of one side of the ultra-thin glass layer; the second buffer layer is located on the surface of the other side, away from the first buffer layer, of the ultra-thin glass layer; the hardened layer is located on the surface of the side, away from the ultra-thin glass layer, of the first buffer layer. According to the anti-explosion impact-resistant ultrathin flexible glass and the preparation method thereof, the anti-explosion impact-resistant ultrathin flexible glass has high impact resistance, high explosion resistance, edge breakage resistance and high bending performance, and the problems that traditional flexible glass is poor in impact resistance and prone to fragmentation and layering are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to an anti-explosion and impact-resistant ultra-thin flexible glass, a preparation method thereof and a display module. BACKGROUND

[0002] In recent years, foldable mobile phones have developed rapidly. As a key component of the display, ultra-thin flexible glass has also developed rapidly. At present, the mainstream scheme is to adhere a layer of optical transparent adhesive (OCA) or polyethylene terephthalate (PET) on the surface of the flexible glass. This is because the single ultra-thin flexible glass cannot be directly applied to the surface protection layer of the foldable mobile phone. The ultra-thin characteristic of the ultra-thin flexible glass (UTG) makes it have weak impact resistance and is easy to break. Therefore, an impact-resistant layer (such as a film or a coated film layer) needs to be added to protect it. The friction resistance, hardness and hand feeling of PET and transparent polyimide film (CPI) cannot be compared with those of glass. In addition, they are easy to delaminate under extreme conditions. At the same time, although the polymer material (such as polyimide film) has good flexibility, it cannot meet the requirements of the flexible display screen on its hardness, scratch resistance and optical performance.

[0003] The current flexible glass cannot fully meet the performance requirements of foldable mobile phones, such as explosion-proof and impact resistance. In addition, the increasingly developed foldable mobile phones also have higher requirements for flexible glass. Therefore, the current mainstream scheme in the industry envisages coating a high-molecular coating on the surface of the flexible glass, combining the advantages of the high-molecular coating and the flexible glass, and using a soft and hard combination to solve the problems of weak impact resistance of single flexible glass, easy breakage, and easy delamination and edge collapse during repeated folding of the flexible glass adhered with PET or CPI, and easy edge collapse when the device is knocked.

[0004] Under this background, it has become a core issue in the field of foldable screens to develop a new type of flexible glass production technology with high impact resistance, excellent explosion-proof performance, edge collapse prevention, high folding property and large-scale production. SUMMARY

[0005] Based on the technical problems mentioned in the background, the present application provides an anti-explosion and impact-resistant ultra-thin flexible glass and a preparation method thereof, which has high impact resistance, high explosion-proof performance, edge collapse prevention and high bending property, and solves the problems of weak impact resistance, easy breakage and easy delamination of traditional flexible glass.

[0006] The anti-explosion and impact-resistant ultra-thin flexible glass provided by the present application comprises:

[0007] an ultra-thin glass layer;

[0008] a first buffer layer located on one side surface of the ultra-thin glass layer;

[0009] a second buffer layer located on the other side surface of the ultrathin glass layer away from the first buffer layer;

[0010] a hardening layer located on the side surface of the first buffer layer away from the ultrathin glass layer.

[0011] Preferably, the tensile modulus of the ultrathin glass layer is 1-80 Gpa, and the pencil hardness is 3-7H.

[0012] Preferably, the thickness of the ultrathin glass layer is 30-100 μm.

[0013] Preferably, the material of the ultrathin glass layer is any one of soda-lime glass, alumino-silicate glass, soda-alumino-silicate glass, lithium-alumino-silicate glass, phospho-alumino-silicate glass or microcrystalline glass.

[0014] In the present application, the ultrathin property of the ultrathin glass layer makes it almost impossible to have plastic deformation before brittle fracture, so that the ultrathin flexible glass can be restored to the initial state even after high-temperature static bending for a period of time; therefore, while not affecting the bending property of the ultrathin glass layer, controlling the tensile modulus of the ultrathin glass layer to be 1-80 Gpa and the pencil hardness to be 3-7H can ensure the overall drop resistance and hardness properties of the ultrathin flexible glass and provide good protection for the flexible display panel.

[0015] In the present application, the smaller the thickness of the ultrathin glass layer, the more conducive to improving flexibility; the greater the thickness of the ultrathin glass layer, the more conducive to improving strength, so as not to be easily broken and damaged; in the present application, the thickness of the ultrathin glass layer is preferably 30-100 μm, which can be 33 μm, 36 μm, 39 μm, 42 μm, 47 μm, 50 μm, 53 μm, 56 μm, 59 μm, 62 μm, 65 μm, 68 μm, 71 μm, 75 μm, 79 μm, 82 μm, 85 μm, 89 μm, 93 μm, 95 μm or 98 μm, etc., so as to realize the bending property of the ultrathin flexible glass and have sufficient strength.

[0016] Preferably, the tensile modulus of the hardening layer is 2-6 Gpa, and the pencil hardness is 1-7H.

[0017] Preferably, the thickness of the hardening layer is 4-7 μm.

[0018] Preferably, the material of the hardening layer is any one of polyurethane resin, acrylic resin, epoxy resin, amino resin, alkyd resin or silicone resin.

[0019] In the present application, the hardening layer has certain hardness and strength to protect the ultra-thin glass layer and reduce the risk of being scratched or broken under pressure. The pencil hardness of the hardening layer should be more than 1H, and the tensile modulus should be at least 1Gpa. In this way, the impact resistance of the overall ultra-thin flexible glass can be effectively improved after covering the hardening layer, and the protection of the ultra-thin glass layer can be realized.

[0020] In the present application, the thickness of the hardening layer is preferably 4-7μm. When the thickness of the hardening layer is specifically set, the thickness of the hardening layer can be 4.5μm, 5μm, 5.5μm, 6μm or 6.5μm, etc. In this way, the hardening layer has sufficient flexibility while having sufficient protective effect on the ultra-thin glass layer.

[0021] In the present application, the hardening layer can be any one of polyurethane resin, acrylic resin, epoxy resin, amino resin, alkyd resin or silicone resin, preferably a multi-functional polyurethane acrylate resin hardening layer with AF properties. It can convert impact kinetic energy into its own elastic potential energy by its own tensile deformation, and dissipate energy to both sides by its own tensile deformation, thereby dispersing most of the energy. In this way, the hardening layer has good bending and light transmission properties, ensuring that the bending and optical properties of the ultra-thin glass do not deteriorate significantly after covering the hardening layer.

[0022] Preferably, the tensile modulus of the first buffer layer is 175MPa-1.5Gpa, and the elongation at break is 15-120%;

[0023] Preferably, the thickness of the first buffer layer is 5-35μm;

[0024] Preferably, the material of the first buffer layer is any one of polyurethane elastomer, polyacrylate elastomer, thermoplastic dynamic vulcanization rubber or silicone rubber.

[0025] In the present application, the tensile modulus of the first buffer layer is 175MPa-1.5Gpa, and the elongation at break is 15-120%. In fact, it is a high-elasticity buffer layer with low modulus. In this way, the energy transmitted from the upper layer can be absorbed and converted into heat energy in the form of damping, and the transmission of hardening layer deformation can also be prevented, thereby relieving the stress on the ultra-thin glass layer.

[0026] In the present application, the thickness of the first buffer layer is preferably 5-35μm. When the thickness of the first buffer layer is specifically set, the thickness of the first buffer layer can be 6μm, 8μm, 10μm, 13μm, 16μm, 18μm, 20μm, 23μm, 25μm, 27μm, 30μm, 32μm or 34μm.

[0027] Preferably, the tensile modulus of the second buffer layer is 75 MPa-1 GPa, and the elongation at break is 120-450%.

[0028] Preferably, the thickness of the second buffer layer is 5-35 μm;

[0029] Preferably, the material of the second buffer layer is any one of polyurethane elastomer, polyacrylate elastomer, thermoplastic dynamic vulcanizate, or silicone rubber.

[0030] In this invention, the elastic modulus of the second buffer layer is 75MPa-1Gpa, and the elongation at break is 120-450%. In essence, it is also a high-elasticity buffer layer with a low modulus, which can provide sufficient buffering capacity for the other side surface of the ultra-thin glass layer.

[0031] In this invention, the thickness of the second buffer layer is preferably 5-35μm. When specifically setting the thickness of the second buffer layer, the thickness of the second buffer layer can be 6μm, 8μm, 10μm, 13μm, 16μm, 18μm, 20μm, 23μm, 25μm, 27μm, 30μm, 32μm or 34μm.

[0032] Preferably, the ultrathin flexible glass further includes:

[0033] An end-face buffer layer is located on the end face of the ultra-thin glass layer and is integrally formed with the first buffer layer or the second buffer layer.

[0034] In this invention, because the ultrathin glass layer is flexible, thin, and fragile, especially its end face is easily damaged. Even a defect of a few micrometers can cause the ultrathin glass layer to shatter. Therefore, when the end face buffer layer located on the end face of the ultrathin glass layer cooperates with the first and second buffer layers on the opposite two surfaces to completely cover the ultrathin glass layer, the edge of the ultrathin glass layer can be protected. In this way, when the periphery of the ultrathin glass layer is subjected to pressure or any stimulation, it can absorb the pressure, play a role in protecting the ultrathin glass layer, and reduce the possibility of the entire ultrathin glass layer shattering due to stress on the end face.

[0035] Preferably, the ultrathin flexible glass further includes:

[0036] An ink border layer is located on the side surface of the ultrathin glass layer near the first buffer layer or the second buffer layer, and surrounds the edge of the surface of the ultrathin glass layer;

[0037] Preferably, the ink border layer is formed by printing thermosetting ink onto the surface of the flexible glass layer and / or the surface of the end face buffer layer and curing it.

[0038] Preferably, the thickness of the ink border layer is 4-7 μm.

[0039] In this invention, the ink border layer can be printed between the first buffer layer and the ultra-thin flexible glass, and coincide with the outer edge of the first buffer layer; the ink layer can also be printed between the second buffer layer and the ultra-thin flexible glass, and coincide with the outer edge of the second buffer layer.

[0040] This invention also proposes a method for preparing the above-mentioned explosion-proof and impact-resistant ultrathin flexible glass, comprising:

[0041] A first buffer layer is formed on one side surface of the ultra-thin glass layer; a second buffer layer is formed on the other side surface of the ultra-thin glass layer away from the first buffer layer; and a hardening layer is formed on the side surface of the first buffer layer away from the ultra-thin glass layer, thus obtaining the explosion-proof and impact-resistant ultra-thin flexible glass.

[0042] Preferably, a first buffer layer is formed by coating a photocurable elastomer material onto one side of the ultrathin glass layer and then curing it; a second buffer layer is formed by coating a photocurable elastomer material onto the other side of the ultrathin glass layer away from the first buffer layer and then curing it.

[0043] Preferably, the photocurable elastomer material is a composition comprising a photocurable resin, an active monomer, a photoinitiator, a silane coupling agent, and a solvent.

[0044] In this invention, the first buffer layer should also have good adhesion to the ultrathin glass layer and the hardening layer to ensure that the hardening layer and the ultrathin glass layer do not separate during bending. Simultaneously, it should be able to bear the stress experienced by the ultrathin glass layer and the hardening layer during bending, thereby further improving the bending characteristics of the ultrathin flexible glass. In practical applications, a photocurable elastomer material system containing solvent, active monomer, and silane coupling agent can be selected. The excellent wettability of the solvent and active monomer is used to wet the glass, and their polar groups form hydrogen bonds with the glass surface. The methoxy groups of the silane coupling agent condense with the hydroxyl groups on the glass to form a strong bond. Simultaneously, by utilizing the similar properties to the resin, which is also a hardening layer, good adhesion to the ultrathin glass layer and the hardening layer is achieved.

[0045] In this invention, the second buffer layer and the ultra-thin glass layer should have good adhesion to ensure that they do not separate during bending. In practical applications, a buffer layer adhesive system containing solvents and active monomers can also be selected.

[0046] The present invention also proposes a display module comprising the aforementioned explosion-proof and impact-resistant ultrathin flexible glass.

[0047] The beneficial effects of this invention are:

[0048] In this invention, multiple layers of toughened ultrathin glass are stacked, each layer performing different functions to achieve preset performance requirements. At the same time, through innovative stacking structure, the ultrathin flexible glass as a whole possesses key properties such as high impact resistance, explosion resistance, and edge protection, providing a more reliable cover plate solution for foldable screen devices. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the ultrathin flexible glass described in Embodiment 1 of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of the ultrathin flexible glass described in Embodiment 2 of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of the ultrathin flexible glass described in Embodiment 3 of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of the ultrathin flexible glass described in Comparative Example 1 of the present invention. Detailed Implementation

[0053] Example 1

[0054] Reference Figure 1 This embodiment proposes an explosion-proof and impact-resistant ultrathin flexible glass, comprising:

[0055] 100mm ultra-thin glass layer;

[0056] The first buffer layer 110 is located on one side surface of the ultrathin glass layer 100;

[0057] The second buffer layer 120 is located on the other side of the ultrathin glass layer 100 away from the first buffer layer 110;

[0058] The hardened layer 130 is located on the side of the first buffer layer 110 away from the ultrathin glass layer 100;

[0059] The second buffer layer 120 includes a first portion covering one side surface of the ultra-thin glass layer 100 and a second portion covering the end face of the ultra-thin glass layer; the first buffer layer 110 includes a third portion covering the other side surface of the ultra-thin glass layer, and the first portion, the second portion, the third portion and the ink border layer work together to completely cover the ultra-thin glass layer 100.

[0060] The ink border layer 140 is located on the side surface of the ultrathin glass layer 100 near the first buffer layer 110, and surrounds the surface edge of the ultrathin glass layer 100 and extends beyond the edge of the ultrathin glass layer 100 to cover the second part of the surface of the second buffer layer 120.

[0061] The aforementioned ultrathin glass layer 100 is UTG ultrathin glass with a thickness of 60 μm, a tensile modulus of 30 GPa, and a pencil hardness of 6H. The hardened layer 130 uses a photocurable polyurethane acrylic resin system with a thickness of 6 μm, a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5 GPa, and an elongation at break ≥1.5%. The first buffer layer 110 also uses a photocurable polyurethane acrylic resin system with a thickness of 20 μm, a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5 GPa, and an elongation at break ≥35%. The second buffer layer 120 also uses a photocurable polyurethane acrylic resin system with a thickness of 20 μm, a Shore hardness of 65D, a Tg point of 55℃, a tensile modulus of 970 MPa, and an elongation at break ≥230%.

[0062] The preparation method of the above-mentioned explosion-proof and impact-resistant ultrathin flexible glass includes:

[0063] UTG ultrathin glass with a thickness of 60μm is used as ultrathin glass layer 100. The tensile modulus of ultrathin glass layer 100 is 30Gpa and the pencil hardness is 6H.

[0064] A second buffer layer 120 with a thickness of 20 μm is coated on one side surface and end face of the ultrathin glass layer 100 by a coating process. The second buffer layer 120 has a Shore hardness of 65D, a Tg point of 55℃, a tensile modulus of 970MPa, and an elongation at break of ≥230%.

[0065] A 5μm thick ink border layer 140 is printed on the other side surface of the ultrathin glass layer 100 and on the surface of the second buffer layer 120 located at the end face by a printing process. The ink border layer 140 surrounds the edge of the surface of the ultrathin glass layer 100 and extends beyond the edge of the ultrathin glass layer 100.

[0066] Then, a first buffer layer 110 with a thickness of 20μm is coated on the same side surface of the ultrathin glass layer 100 and the surface of the ink border layer 140 by a coating process. The first buffer layer 110 has a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5Gpa, and an elongation at break of ≥35%.

[0067] Next, a hardening layer 130 with a thickness of 6 μm is coated on the surface of the first buffer layer 110 away from the ultrathin glass layer 100 by a coating process. The hardening layer 130 has a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5Gpa, and an elongation at break ≥1.5%.

[0068] Example 2

[0069] Reference Figure 2 This embodiment proposes an explosion-proof and impact-resistant ultrathin flexible glass, comprising:

[0070] 200mm ultra-thin glass layer;

[0071] The first buffer layer 210 is located on one side surface of the ultrathin glass layer 200;

[0072] The second buffer layer 220 is located on the other side of the ultrathin glass layer 200 away from the first buffer layer 210.

[0073] The hardened layer 230 is located on the side of the first buffer layer 210 away from the ultrathin glass layer 200;

[0074] The first buffer layer 210 includes a first portion covering one side surface of the ultra-thin glass layer 200 and a second portion covering the end face of the ultra-thin glass layer; the second buffer layer 220 includes a third portion covering the other side surface of the ultra-thin glass layer, and the first portion, the second portion, the third portion and the ink border layer work together to completely cover the ultra-thin glass layer 200.

[0075] The ink border layer 240 is located on the side surface of the ultrathin glass layer 200 near the first buffer layer 210, and surrounds the surface edge of the ultrathin glass layer 200 and extends beyond the edge of the ultrathin glass layer 200 to cover a second part of the surface of the first buffer layer 210.

[0076] The aforementioned ultrathin glass layer 200 is UTG ultrathin glass with a thickness of 60 μm, a tensile modulus of 30 GPa, and a pencil hardness of 6H. The hardening layer 230 uses a photocurable polyurethane acrylic resin system with a thickness of 6 μm, a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5 GPa, and an elongation at break ≥1.5%. The first buffer layer 210 also uses a photocurable polyurethane acrylic resin system with a thickness of 20 μm, a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5 GPa, and an elongation at break ≥35%. The second buffer layer 220 also uses a photocurable polyurethane acrylic resin system with a thickness of 6 μm, a Shore hardness of 35D, a Tg point of 30℃, a tensile modulus of 750 MPa, and an elongation at break ≥300%.

[0077] The preparation method of the above-mentioned explosion-proof and impact-resistant ultrathin flexible glass includes:

[0078] UTG ultrathin glass with a thickness of 60μm is used as the ultrathin glass layer 200. The tensile modulus of the ultrathin glass layer 200 is 30Gpa, and the pencil hardness is 6H.

[0079] A first buffer layer 210 with a thickness of 20 μm is coated on one side surface and end face of the ultrathin glass layer 200 by a coating process. The first buffer layer 210 has a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5 GPa, and an elongation at break of ≥35%.

[0080] A 5μm thick ink border layer 240 is printed on the other side surface of the ultrathin glass layer 200 and on the surface of the first buffer layer 210 located at the end face by a printing process. The ink border layer 240 surrounds the edge of the surface of the ultrathin glass layer 200 and extends out of the edge of the ultrathin glass layer 100.

[0081] Then, a second buffer layer 220 with a thickness of 20μm is coated on the same side surface of the ultrathin glass layer 20 and the surface of the ink border layer 240 by a coating process. The second buffer layer 220 has a Shore hardness of 35D, a Tg point of 30℃, a tensile modulus of 750MPa, and an elongation at break of ≥300%.

[0082] Next, a hardening layer 230 with a thickness of 6μm is coated on the surface of the first buffer layer 210 away from the ultrathin glass layer 200 by a coating process. The hardening layer 230 has a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5Gpa, and an elongation at break ≥1.5%.

[0083] Example 3

[0084] Reference Figure 3 This embodiment proposes an explosion-proof and impact-resistant ultrathin flexible glass, comprising:

[0085] 300mm ultra-thin glass layer;

[0086] The first buffer layer 310 is located on one side surface of the ultrathin glass layer 300;

[0087] The second buffer layer 320 is located on the side of the first buffer layer 310 away from the ultrathin glass layer 300;

[0088] The third buffer layer 330 is located on the other side of the ultrathin glass layer 300 away from the first buffer layer 310;

[0089] The hardened layer 340 is located on the side of the second buffer layer 320 away from the first buffer layer 310;

[0090] The third buffer layer 330 includes a first portion covering one side surface of the ultra-thin glass layer 300 and a second portion covering the end face of the ultra-thin glass layer; the first buffer layer 310 includes a third portion covering the other side surface of the ultra-thin glass layer, and the first portion, the second portion, the third portion and the ink border layer work together to completely cover the ultra-thin glass layer 300.

[0091] The ink border layer 350 is located on the side surface of the ultrathin glass layer 300 near the first buffer layer 310, and surrounds the surface edge of the ultrathin glass layer 300 and extends beyond the edge of the ultrathin glass layer 300 to cover the second part of the surface of the third buffer layer 330.

[0092] The aforementioned ultrathin glass layer 300 is UTG ultrathin glass with a thickness of 60 μm, a tensile modulus of 30 GPa, and a pencil hardness of 6H. The hardening layer 340 uses a photocurable polyurethane acrylic resin system with a thickness of 6 μm, a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5 GPa, and an elongation at break ≥1.5%. The first buffer layer 310 also uses a photocurable polyurethane acrylic resin system with a thickness of 8 μm, a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5 GPa, and an elongation at break ≥35%. The second buffer layer 320 also uses a photocurable polyurethane acrylic resin system with a Shore hardness of 65D, a Tg point of 55℃, a tensile modulus of 970 MPa, and an elongation at break ≥230%. The third buffer layer 330 also uses a photocurable polyurethane acrylic resin system with a Shore hardness of 35D, a Tg point of 30℃, a tensile modulus of 750 MPa, and an elongation at break ≥300%.

[0093] The preparation method of the above-mentioned explosion-proof and impact-resistant ultrathin flexible glass includes:

[0094] UTG ultrathin glass with a thickness of 60μm is used as the ultrathin glass layer 300. The tensile modulus of the ultrathin glass layer 300 is 30Gpa, and the pencil hardness is 6H.

[0095] A third buffer layer 330 with a thickness of 20 μm is coated on one side surface and end face of the ultrathin glass layer 300 by a coating process. The third buffer layer 330 has a Shore hardness of 35D, a Tg point of 30℃, a tensile modulus of 750MPa, and an elongation at break of ≥300%.

[0096] A 5μm thick ink border layer 350 is printed on the other side surface of the ultrathin glass layer 300 and on the surface of the third buffer layer 330 located at the end face by a printing process. The ink border layer 350 surrounds the edge of the ultrathin glass layer 300 and extends beyond the edge of the ultrathin glass layer 300.

[0097] Then, a first buffer layer 310 with a thickness of 8μm is coated on the same side surface of the ultrathin glass layer 300 and the surface of the ink border layer 350 through a coating process. The first buffer layer 310 has a hardness of HB, a Tg point of 75℃, a tensile modulus of 1.5Gpa, and an elongation at break of ≥35%.

[0098] A second buffer layer 320 with a thickness of 20 μm is coated on the side of the first buffer layer 310 away from the ultrathin glass layer 300 by a coating process. The second buffer layer 320 also adopts a photocurable system of polyurethane acrylic resin with a Shore hardness of 65D, a Tg point of 55℃, a tensile modulus of 970MPa, and an elongation at break of ≥230%.

[0099] Then, a hardening layer 340 with a thickness of 6μm is coated on the surface of the second buffer layer 320 away from the first buffer layer 310 by a coating process. The hardening layer 340 has a pencil hardness ≥3H, a Tg point of 103℃, a tensile modulus of 5Gpa, and an elongation at break ≥1.5%.

[0100] Comparative Example 1

[0101] Reference Figure 4 This comparative example proposes an ultrathin flexible glass, comprising:

[0102] 400mm ultra-thin glass layer;

[0103] OCA layer 410 is located on the upper and lower surfaces of the ultrathin glass layer 400;

[0104] The PET layer 420 is located on the side of the OCA layer 410 away from the ultrathin glass layer 400.

[0105] The aforementioned ultrathin glass layer 400 is UTG ultrathin glass with a thickness of 60μm, a tensile modulus of 30Gpa, and a pencil hardness of 6H; the OCA layer 410 is made of acrylic resin with a light transmittance of ≥91%, can withstand 200,000 dynamic bending tests (curvature radius 1.5-3mm), and has a thickness of 25μm; the PET layer is made of polyethylene terephthalate, can withstand more than 200,000 dynamic bending tests (curvature radius 1.5-3mm), has a tensile modulus of 4Gpa, and has a thickness of 32μm.

[0106] Comparative Example 2

[0107] This comparative example proposes an ultrathin flexible glass, which differs from Example 1 only in that the first buffer layer 110 is omitted and the hardening layer 130 is used instead of the first buffer layer 110 for structural configuration.

[0108] Comparative Example 3

[0109] This comparative example presents an ultrathin flexible glass, which differs from Example 1 only in that the first buffer layer 110 has a hardness of 1H, a Tg point of 89°C, a tensile modulus of 2.5 GPa, and an elongation at break of ≥15%.

[0110] Comparative Example 4

[0111] This comparative example presents an ultrathin flexible glass, which differs from Example 1 only in that the Tg point of the first buffer layer 110 is 25°C, the tensile modulus is 50 MPa, and the elongation at break is ≥450%.

[0112] The properties of the ultrathin flexible glass obtained in the above embodiments and comparative examples are shown in Table 1 below:

[0113] Table 1. Performance test results of the ultrathin flexible glass described in the embodiments and comparative examples.

[0114]

[0115] As shown in Table 1 above, compared with the comparative example, the ultra-thin flexible glass described in the embodiment has high impact resistance, high explosion resistance, anti-chipping properties, and high bending properties.

[0116] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An explosion-proof and impact-resistant ultrathin flexible glass, characterized in that, include: Ultra-thin glass layer; The first buffer layer is located on one side surface of the ultra-thin glass layer; The second buffer layer is located on the surface of the ultrathin glass layer away from the first buffer layer; The hardened layer is located on the side of the first buffer layer away from the ultrathin glass layer.

2. The explosion-proof and impact-resistant ultrathin flexible glass according to claim 1, characterized in that, The tensile modulus of the ultrathin glass layer is 1-80 GPa, and the pencil hardness is 3-7H. Preferably, the thickness of the ultrathin glass layer is 30-100 μm; Preferably, the material of the ultrathin glass layer is any one of soda-lime glass, aluminosilicate glass, sodium aluminum silicate glass, lithium aluminum silicate glass, phosphor aluminum silicate glass, or microcrystalline glass.

3. The explosion-proof and impact-resistant ultrathin flexible glass according to claim 1 or 2, characterized in that, The tensile modulus of the hardened layer is 2-6 GPa, and the pencil hardness is 1-7 H. Preferably, the thickness of the hardened layer is 4-7 μm; Preferably, the material of the hardened layer is any one of polyurethane resin, acrylic resin, epoxy resin, amino resin, alkyd resin or silicone resin.

4. The explosion-proof and impact-resistant ultrathin flexible glass according to any one of claims 1-3, characterized in that, The tensile modulus of the first buffer layer is 175 MPa-1.5 GPa, and the elongation at break is 15-120%. Preferably, the thickness of the first buffer layer is 5-35 μm; Preferably, the material of the first buffer layer is any one of polyurethane elastomer, polyacrylate elastomer, thermoplastic dynamic vulcanizate, or silicone rubber.

5. The explosion-proof and impact-resistant ultrathin flexible glass according to any one of claims 1-4, characterized in that, The tensile modulus of the second buffer layer is 75 MPa-1 GPa, and the elongation at break is 120-450%. Preferably, the thickness of the second buffer layer is 5-35 μm; Preferably, the material of the second buffer layer is any one of polyurethane elastomer, polyacrylate elastomer, thermoplastic dynamic vulcanizate, or silicone rubber.

6. The explosion-proof and impact-resistant ultrathin flexible glass according to any one of claims 1-5, characterized in that, Also includes: An end-face buffer layer is located on the end face of the ultra-thin glass layer and is integrally formed with the first buffer layer or the second buffer layer.

7. The explosion-proof and impact-resistant ultrathin flexible glass according to any one of claims 1-6, characterized in that, Also includes: An ink border layer is located on the side surface of the ultrathin glass layer near the first buffer layer or the second buffer layer, and surrounds the surface edge of the ultrathin glass layer; Preferably, the ink border layer is formed by printing thermosetting ink onto the surface of the ultrathin glass layer and / or the surface of the end face buffer layer and curing it. Preferably, the thickness of the ink border layer is 4-7 μm.

8. A method for preparing the explosion-proof and impact-resistant ultrathin flexible glass according to any one of claims 1-7, characterized in that, include: A first buffer layer is formed on one side surface of the ultra-thin glass layer; a second buffer layer is formed on the other side surface of the ultra-thin glass layer away from the first buffer layer; and a hardening layer is formed on the side surface of the first buffer layer away from the ultra-thin glass layer, thus obtaining the explosion-proof and impact-resistant ultra-thin flexible glass.

9. The preparation method of the explosion-proof and impact-resistant ultrathin flexible glass according to claim 8, characterized in that, A first buffer layer is formed by coating a photocurable elastomer material onto one side of the ultrathin glass layer and then curing it; a second buffer layer is formed by coating a photocurable elastomer material onto the other side of the ultrathin glass layer away from the first buffer layer and then curing it. Preferably, the photocurable elastomer material is a composition comprising a photocurable resin, an active monomer, a photoinitiator, a silane coupling agent, and a solvent.

10. A display module, characterized in that, Includes the explosion-proof and impact-resistant ultrathin flexible glass as described in any one of claims 1-7.

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