Impact-resistant ultrathin glass cover plate, preparation method thereof and display module

Abstract

The invention provides an impact-resistant ultra-thin glass cover plate, a preparation method thereof and a display module. The impact-resistant ultra-thin glass cover plate comprises a hardened layer, a first buffer layer, an ultra-thin glass layer and a second buffer layer which are sequentially stacked, the hardened layer is formed by photo-curing a coating liquid containing urethane acrylate and an active monomer; the first buffer layer and the second buffer layer are formed by thermocuring a coating liquid containing a polyimide precursor. According to the impact-resistant ultrathin glass cover plate, the preparation method thereof and the display module provided by the invention, the advantages of high hardness of the hardened layer and good glass adhesiveness and flexibility of the buffer layer are integrated, and the finally obtained flexible ultrathin glass cover plate has the performance advantages of high impact resistance, high hardness and high bending property.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and particularly relates to an impact-resistant ultra-thin glass cover plate, its preparation method, and a display module. Background Technology

[0002] With the development of display technology, mobile terminal displays have evolved from flat screens to flexible screens. Among them, ultra-thin glass (UTG) is a crucial component of flexible screens, serving as a protective cover. Although UTG offers advantages such as a pleasant tactile feel, its impact resistance is relatively poor. For example, its performance against pen or ball drops decreases significantly as the thickness of the bendable UTG decreases, making it unsuitable for direct use as a protective cover.

[0003] Given the above shortcomings, the surface of ultra-thin glass needs to be coated with an impact-resistant coating or laminated to improve its impact resistance. However, after applying a regular organic coating or laminating a film, the surface hardness and scratch resistance of ultra-thin glass are greatly reduced, and it has a strong plastic feel and poor hand feel, losing the advantages of glass such as high hardness, high scratch resistance and good hand feel. Summary of the Invention

[0004] Based on the technical problems mentioned in the background, this invention proposes an impact-resistant ultra-thin glass cover plate and its preparation method, as well as a display module. It combines the advantages of high hardness of the hardened layer and good adhesion and flexibility of the buffer layer to the glass. The resulting ultra-thin glass cover plate has the performance advantages of high impact resistance, high hardness and high bending performance.

[0005] The present invention proposes an impact-resistant ultra-thin glass cover plate, comprising a hardened layer, a first buffer layer, an ultra-thin glass layer and a second buffer layer stacked sequentially. The hardened layer is formed by photocuring a coating liquid comprising polyurethane acrylate and active monomers; the first buffer layer and the second buffer layer are formed by thermocuring a coating liquid comprising a polyimide precursor.

[0006] In this invention, a coating solution using multifunctional polyurethane acrylate and active monomers as the hardening layer is cured by ultraviolet light (UV curing). This results in a coating with high functionality, high crosslinking degree, and high hardness, but relatively low bendability and poor adhesion to glass. Meanwhile, a polyimide precursor solution is used as the buffer layer coating solution. After heat curing, the resulting buffer layer exhibits good flexibility, good adhesion to glass, and explosion-proof properties. This invention achieves good adhesion between the ultrathin glass layer and the hardening layer through the composite layering of the buffer and hardening layers, utilizing the similar properties of both being resins. This results in a superior overall performance of the ultrathin glass cover.

[0007] Preferably, the coating liquid used for the hardening layer comprises, by weight: 50-100 parts of polyurethane acrylate, 10-50 parts of active monomer, 1-10 parts of photoinitiator, and 40-80 parts of organic solvent; Preferably, the polyurethane acrylate is a multifunctional polyurethane acrylate; the active monomer is an acrylate monomer containing at least two double bonds.

[0008] Preferably, the active monomer is at least one selected from trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, 1,3-butanediol dimethacrylate, or 1,6-hexanediol dimethacrylate; the photoinitiator is at least one selected from 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, or 2,4,6-trimethylbenzoyl diphenylphosphine oxide; and the organic solvent is at least one selected from ethanol, isopropanol, ethyl acetate, butyl acetate, butanone, methyl isobutyl ketone, propylene glycol methyl ether, or ethylene glycol ethyl ether acetate.

[0009] Preferably, the coating liquid used for the hardening layer further includes, by weight, 5-30 parts of silicone-modified polyurethane acrylate; Preferably, the organosilicon-modified polyurethane acrylate is obtained by a thiol-ene click reaction of low-functionality polyurethane acrylate, mercaptosilsesquioxane, and mercapto nano-silica.

[0010] In this invention, an organosilicon-modified polyurethane acrylate obtained by the thiol-ene click reaction of low-functionality polyurethane acrylate, mercaptosilsesquioxane, and mercapto nano-silica is added to the curing layer coating liquid. This results in the main resin having a silsesquioxane and nano-silica structure, which not only gives the resin better flexibility and increased hardness, but also provides excellent adhesion to glass, improving the overall impact resistance, bending resistance, and explosion-proof properties.

[0011] Preferably, the coating solution used for the first and second buffer layers is a polyamic acid solution; Preferably, the polyamic acid is a flexible polyamic acid.

[0012] Preferably, the flexible polyamic acid is obtained by polycondensation reaction of a diamine containing a flexible chain with a diamine monomer and a dianhydride monomer; In this invention, flexible polyamic acid is obtained by polycondensation reaction of a diamine containing a flexible chain with a diamine monomer and a dianhydride monomer. This polyamic acid serves as a precursor for polyimide, which enhances the bonding force between the polyimide resin buffer layer and the glass substrate. Furthermore, by preparing a hardening layer on the surface of the polyimide buffer layer, the impact resistance and bending performance of the flexible glass cover can be improved.

[0013] Preferably, the diamine containing the flexible chain is an amino-terminated polydimethylsiloxane; the diamine monomer is at least one of p-phenylenediamine, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, or 2,2'-bis(trifluoromethyl)-4,4'-diaminodiphenyl; and the dianhydride monomer is at least one of pyromellitic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride, 3,3',4,4'-diphenyl sulfone tetracarboxylic dianhydride, 4,4'-(hexafluoroisopropylidene) phthalic anhydride, bisphenol A type diether dianhydride, or 3,3',4,4'-biphenyltetracarboxylic dianhydride. Preferably, the solvent of the polyamic acid solution is at least one of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, or N-methylpyrrolidone.

[0014] Preferably, the pencil hardness of the ultrathin glass layer is 5H or higher; Preferably, the thickness of the ultrathin glass layer is 30-100 μm.

[0015] Preferably, the thickness of the hardened layer is 1-15 μm, the thickness of the first buffer layer is 5-35 μm, and the thickness of the second buffer layer is 5-35 μm.

[0016] This invention also proposes a method for preparing the above-mentioned impact-resistant flexible ultrathin glass cover, comprising: A first buffer layer is formed on one side surface of the ultra-thin glass layer, and a hardening layer is formed on the side surface of the first buffer layer away from the ultra-thin glass layer. Then, a second buffer layer is formed on the other side surface of the ultra-thin glass layer away from the first buffer layer, thus obtaining the impact-resistant flexible glass cover.

[0017] In this invention, the buffer layer has good adhesion to the ultra-thin glass layer and the hardening layer, so as to ensure that the hardening layer and the ultra-thin glass layer will not separate during bending. At the same time, it can bear the stress on the ultra-thin glass layer and the hardening layer during bending, thereby improving the bending characteristics of the ultra-thin flexible glass.

[0018] The present invention also proposes a display module, which includes the aforementioned impact-resistant flexible ultrathin glass cover.

[0019] The beneficial effects of the present invention are as follows: In the present invention, by stacking multiple layers of toughened ultrathin glass, each layer undertakes different functions to achieve the preset performance requirements. At the same time, through the innovative stacking structure, the ultrathin flexible glass as a whole has key properties such as high impact resistance, high pencil hardness, and bending resistance, providing a more reliable cover plate solution for foldable screen devices. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the impact-resistant ultra-thin glass cover plate described in this invention. Detailed Implementation

[0021] Example 1

[0022] Reference Figure 1 This embodiment proposes an impact-resistant ultrathin glass cover, comprising: an ultrathin glass layer 100; a first buffer layer 110 located on one side surface of the ultrathin glass layer 100; a second buffer layer 120 located on the other side surface of the ultrathin glass layer 100 away from the first buffer layer 110; and a hardening layer 130 located on the side surface of the first buffer layer 110 away from the ultrathin glass layer 100. The ultrathin glass layer 100 has a thickness of 60 μm and a pencil hardness of 6H; the hardening layer 130 uses a photocurable polyurethane acrylic resin system and has a thickness of 8 μm; the first buffer layer 110 and the second buffer layer 120 use a thermocurable polyimide resin system and both have a thickness of 20 μm.

[0023] The above-mentioned method for preparing impact-resistant ultrathin glass covers includes: (1) Provide an ultra-thin glass layer with a thickness of 60μm and a pencil hardness of 6H; (2) A coating liquid including a polyimide precursor is coated on one side surface of the ultrathin glass layer by a slit coating process. After coating, it is first heated at 100°C for 0.5h under vacuum, and then cured at high temperature in a nitrogen-protected oven by a temperature program of 100°C / 0.5h, 180°C / 0.5h, 250°C / 0.5h, 350°C / 0.5h with a heating rate of 5°C / min to obtain a first buffer layer with a thickness of 20μm. The coating solution is a polyamic acid solution, which is a polydimethylsiloxane (M) capped with p-phenylenediamine and amino groups. w Add p-phenylenediamine to N-methylpyrrolidone at a molar ratio of 1:0.2 and stir until completely dissolved. Then, under nitrogen protection, add pyromellitic dianhydride. The molar ratio of p-phenylenediamine to pyromellitic dianhydride is 1:1.2. Stir and react at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20 wt%. (3) A coating solution comprising polyurethane acrylate and active monomers is applied to the surface of the first buffer layer on the side away from the ultrathin glass layer by a spraying process. After coating, it is cured by a 365nm light source with a curing energy of 3000mJ / cm. 2 UV curing was performed to obtain a hardened layer with a thickness of 8μm; The coating solution comprises, by weight, 80 parts of hexafunctional polyurethane acrylate (Sartoma CN9006), 20 parts of trimethylolpropane trimethacrylate, 10 parts of triethylene glycol dimethacrylate, 2 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 2 parts of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 30 parts of methyl isobutyl ketone, 20 parts of ethyl acetate, and 10 parts of ethylene glycol ethyl ether acetate. The coating solution is obtained by vacuum degassing after stirring and mixing the hexafunctional polyurethane acrylate, trimethylolpropane trimethacrylate, triethylene glycol dimethacrylate, 2-hydroxy-2-methyl-1-phenylpropanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, methyl isobutyl ketone, ethyl acetate, and ethylene glycol ethyl ether acetate. (4) A coating liquid including a polyimide precursor is coated on the other side surface of the ultrathin glass layer by a slit coating process. After coating, it is first heated at 100°C for 0.5h under vacuum, and then cured at high temperature in a nitrogen-protected oven by a temperature program of 100°C / 0.5h, 180°C / 0.5h, 250°C / 0.5h, 350°C / 0.5h with a heating rate of 5°C / min to obtain a second buffer layer with a thickness of 20μm. The coating solution is also a polyamic acid solution, which is a polydimethylsiloxane (M) capped with p-phenylenediamine and amino groups. w Add p-phenylenediamine to N-methylpyrrolidone at a molar ratio of 1:0.2 and stir until completely dissolved. Then, under nitrogen protection, add pyromellitic dianhydride. The molar ratio of p-phenylenediamine to pyromellitic dianhydride is 1:1.2. Stir and react at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20 wt%.

[0024] Example 2 Reference Figure 1 This embodiment also proposes an impact-resistant ultrathin glass cover plate, specifically referring to Embodiment 1. Except for steps (2) and (4), the coating liquid is a polyamic acid solution, which is a mixture of 4,4'-diaminodiphenyl ether and amino-terminated polydimethylsiloxane (M... w Add 1000) to N-methylpyrrolidone at a molar ratio of 1:0.2 and stir until completely dissolved. Under nitrogen protection, add 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 4,4'-diaminodiphenyl ether and 3,3',4,4'-benzophenone tetracarboxylic dianhydride at a molar ratio of 1:1.2. Stir and react at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20 wt%. In step (3), the coating liquid comprises, by weight, 50 parts of hexafunctional polyurethane acrylate (Sartoma CN9006), 30 parts of ethylene glycol dimethacrylate, 20 parts of 1,6-hexanediol dimethacrylate, 1 part of 1-hydroxycyclohexylphenyl ketone, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 20 parts of methyl isobutyl ketone, 15 parts of ethyl acetate, and 5 parts of propylene glycol methyl ether. The coating liquid is obtained by vacuum degassing after stirring and mixing hexafunctional polyurethane acrylate, ethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, methyl isobutyl ketone, ethyl acetate, and propylene glycol methyl ether.

[0025] Example 3 Reference Figure 1 This embodiment also proposes an impact-resistant ultrathin glass cover plate, specifically referring to Embodiment 1. Except for steps (2) and (4), the coating liquid is a polyamic acid solution, which is a mixture of 2,2'-bis(trifluoromethyl)-4,4'-diaminodiphenyl and amino-terminated polydimethylsiloxane (M... w Add 1000) to N-methylpyrrolidone at a molar ratio of 1:0.2 and stir until completely dissolved. Under nitrogen protection, add 3,3',4,4'-biphenyltetracarboxylic dianhydride, 2,2'-bis(trifluoromethyl)-4,4'-diaminodiphenyl and 3,3',4,4'-biphenyltetracarboxylic dianhydride at a molar ratio of 1:1.2. Stir and react at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20 wt%. In step (3), the coating liquid comprises, by weight, 100 parts of hexafunctional polyurethane acrylate (Sartoma CN9006), 10 parts of neopentyl glycol dimethacrylate, 5 parts of 1,3-butanediol dimethacrylate, 2 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 2 parts of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 30 parts of butanone, 40 parts of ethyl acetate, and 10 parts of ethylene glycol ethyl ether acetate. The coating liquid is obtained by stirring and mixing hexafunctional polyurethane acrylate, neopentyl glycol dimethacrylate, 1,3-butanediol dimethacrylate, 2-hydroxy-2-methyl-1-phenylpropanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, butanone, ethyl acetate, and ethylene glycol ethyl ether acetate, followed by vacuum degassing.

[0026] Example 4 Reference Figure 1This embodiment also proposes an impact-resistant ultra-thin glass cover plate, specifically referring to Embodiment 1. Except for step (3), the coating liquid includes the following by weight: 80 parts of hexafunctional polyurethane acrylate (Sartoma CN9006), 15 parts of silicone-modified polyurethane acrylate, 20 parts of trimethylolpropane trimethacrylate, 10 parts of triethylene glycol dimethacrylate, 2 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 2 parts of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 30 parts of methyl isobutyl ketone, 20 parts of ethyl acetate, and 10 parts of ethylene glycol ethyl ether acetate. The silicone-modified polyurethane acrylate is prepared by mixing polyurethane acrylate (SM6329), mercaptopropyl-heptaisobutylsilsesquioxane, mercapto-nano silica, and 2-hydroxy-2-methyl-1-phenylpropanone in acetone at a mass ratio of 1:0.1:0.15:0.02, followed by stirring. The resulting mixture has a strength of 5 W / cm. 2 The mercapto-based nano silica was obtained by irradiating it under a UV lamp for 5 minutes; the mercapto-based nano silica was obtained by adding nano silica (average particle size 50 nm) and 3-mercaptopropyltrimethoxysilane in a mass ratio of 100:5 to a mixed solvent of ethanol and water (mass ratio 5:1), reacting it under reflux in a water bath at 60°C for 8 hours, and then centrifuging it. The coating solution is obtained by stirring and mixing hexafunctional polyurethane acrylate, silicone-modified polyurethane acrylate, trimethylolpropane trimethacrylate, triethylene glycol dimethacrylate, 2-hydroxy-2-methyl-1-phenylpropanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, methyl isobutyl ketone, ethyl acetate, and ethylene glycol ethyl ether acetate, followed by vacuum degassing. Comparative Example 1 This comparative example proposes an ultrathin glass cover plate, comprising: an ultrathin glass layer; a hardening layer located on one side surface of the ultrathin glass layer; and a buffer layer located on the other side surface of the ultrathin glass layer away from the hardening layer. The ultrathin glass layer has a thickness of 60μm and a pencil hardness of 6H; the hardening layer uses a photocurable polyurethane acrylic resin system with a thickness of 8μm; and the buffer layer uses a thermocurable polyimide resin system with a thickness of 20μm.

[0027] The preparation method of the above-mentioned ultrathin glass cover includes: (1) Provide an ultra-thin glass layer with a thickness of 60μm and a pencil hardness of 6H; (2) A coating solution comprising polyurethane acrylate and active monomers is applied to one side surface of the ultrathin glass layer by a spraying process. After coating, it is cured by a 365nm light source with a curing energy of 3000mJ / cm. 2 UV curing was performed to obtain a hardened layer with a thickness of 8μm; The coating solution comprises, by weight, 80 parts of hexafunctional polyurethane acrylate (Sartoma CN9006), 20 parts of trimethylolpropane trimethacrylate, 10 parts of triethylene glycol dimethacrylate, 2 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 2 parts of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 30 parts of methyl isobutyl ketone, 20 parts of ethyl acetate, and 10 parts of ethylene glycol ethyl ether acetate. The coating solution is obtained by vacuum degassing after stirring and mixing the hexafunctional polyurethane acrylate, trimethylolpropane trimethacrylate, triethylene glycol dimethacrylate, 2-hydroxy-2-methyl-1-phenylpropanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, methyl isobutyl ketone, ethyl acetate, and ethylene glycol ethyl ether acetate. (3) A coating liquid including a polyimide precursor is coated on the other side surface of the ultrathin glass layer by a slit coating process. After coating, the coating is first heated at 100°C for 0.5h under vacuum, and then cured at high temperature in a nitrogen-protected oven by a temperature program of 100°C / 0.5h, 180°C / 0.5h, 250°C / 0.5h, 350°C / 0.5h with a heating rate of 5°C / min to obtain a second buffer layer with a thickness of 20μm. The coating solution is a polyamic acid solution, which is a polydimethylsiloxane (M) capped with p-phenylenediamine and amino groups. w Add p-phenylenediamine to N-methylpyrrolidone at a molar ratio of 1:0.2 and stir until completely dissolved. Then, under nitrogen protection, add pyromellitic dianhydride. The molar ratio of p-phenylenediamine to pyromellitic dianhydride is 1:1.2. Stir and react at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20 wt%. Comparative Example 2 This comparative example proposes an ultra-thin glass cover plate, specifically referring to Example 1. Except for steps (2) and (4), the coating liquid is a polyamic acid solution, which is obtained by adding p-phenylenediamine to N-methylpyrrolidone and stirring until completely dissolved, then adding pyromellitic anhydride under nitrogen protection. The molar ratio of p-phenylenediamine to pyromellitic anhydride is 1:1. The mixture is stirred and reacted at room temperature for 8 hours to obtain a polyamic acid solution with a curing amount of 20wt%. Comparative Example 3 This comparative example proposes an ultrathin glass cover, specifically referring to Example 4. Except for step (3), the silicone-modified polyurethane acrylate is prepared by adding polyurethane acrylate (SM6329), mercaptopropyl-heptaisobutylsilsesquioxane, nano-silica (average particle size 50nm), and 2-hydroxy-2-methyl-1-phenylpropanone to acetone in a mass ratio of 1:0.1:0.15:0.02 and stirring to achieve a strength of 5W / cm. 2 Obtained by irradiation under a UV lamp for 5 minutes; The performance of the ultrathin glass cover plates obtained in the above embodiments and comparative examples is shown in Table 1 below: Bending performance test: The bending performance test is carried out by a bending machine. The glass cover is attached to the bending machine test table and repeatedly folded by the bending machine test table. Pencil hardness test: A pencil is pressed against the glass cover at approximately 45° under a load of 750g, at a uniform speed of approximately 1cm / s for about 1cm. No scratches are observed.

[0028] Abrasion resistance test: Using 0000# steel wool with an area of ​​10×10mm, a stroke of 40 times / min, a load of 1kg, after 2000 round trips of friction, observe whether there are scratches on the surface; Impact resistance test: A 12.8g Chenguang K35 ballpoint pen was dropped vertically onto a glass cover from a certain height. The impact height was continuously increased until the glass cover was broken, and the impact height was recorded. Transmittance test: The transmittance of the ultrathin glass cover at a wavelength of 550nm was tested using an ultraviolet-visible spectrometer.

[0029] Table 1. Performance test results of the ultrathin glass cover plates described in the embodiments and comparative examples.

[0030] As shown in Table 1 above, compared with the comparative example, the ultra-thin glass cover plate described in the embodiment has high impact resistance, high hardness and high flexibility.

[0031] 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 impact-resistant ultra-thin glass cover, characterized in that, It includes a hardening layer, a first buffer layer, an ultra-thin glass layer, and a second buffer layer that are stacked in sequence. The hardened layer is formed by photocuring a coating liquid comprising polyurethane acrylate and active monomers; the first buffer layer and the second buffer layer are formed by thermocuring a coating liquid comprising a polyimide precursor.

2. The impact-resistant ultra-thin glass cover plate according to claim 1, characterized in that, The coating liquid used for the hardening layer comprises, by weight: 50-100 parts of polyurethane acrylate, 10-50 parts of active monomer, 1-10 parts of photoinitiator, and 40-80 parts of organic solvent. Preferably, the polyurethane acrylate is a multifunctional polyurethane acrylate; the active monomer is an acrylate monomer containing at least two double bonds.

3. The impact-resistant ultra-thin glass cover plate according to claim 2, characterized in that, The active monomer is at least one of trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, 1,3-butanediol dimethacrylate, or 1,6-hexanediol dimethacrylate; the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, or 2,4,6-trimethylbenzoyl diphenylphosphine oxide; the organic solvent is at least one of ethanol, isopropanol, ethyl acetate, butyl acetate, butanone, methyl isobutyl ketone, propylene glycol methyl ether, or ethylene glycol ethyl ether acetate.

4. The impact-resistant ultra-thin glass cover plate according to claim 2 or 3, characterized in that, The coating liquid used for the hardening layer also includes, by weight, 5-30 parts of silicone-modified polyurethane acrylate; Preferably, the organosilicon-modified polyurethane acrylate is obtained by a thiol-ene click reaction of low-functionality polyurethane acrylate, mercaptosilsesquioxane, and mercapto nano-silica.

5. The impact-resistant ultrathin glass cover plate according to any one of claims 1-4, characterized in that, The coating solution used for the first and second buffer layers is a polyamic acid solution; Preferably, the polyamic acid is a flexible polyamic acid.

6. The impact-resistant ultra-thin glass cover plate according to claim 5, characterized in that, The flexible polyamic acid is obtained by polycondensation reaction of a diamine containing a flexible chain with a diamine monomer and a dianhydride monomer. Preferably, the diamine containing the flexible chain is an amino-terminated polydimethylsiloxane; the diamine monomer is at least one of p-phenylenediamine, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, or 2,2'-bis(trifluoromethyl)-4,4'-diaminodiphenyl; and the dianhydride monomer is at least one of pyromellitic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride, 3,3',4,4'-diphenyl sulfone tetracarboxylic dianhydride, 4,4'-(hexafluoroisopropylidene) phthalic anhydride, bisphenol A type diether dianhydride, or 3,3',4,4'-biphenyltetracarboxylic dianhydride. Preferably, the solvent of the polyamic acid solution is at least one of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, or N-methylpyrrolidone.

7. The impact-resistant ultrathin glass cover plate according to any one of claims 1-6, characterized in that, The pencil hardness of the ultra-thin glass layer is 5H or higher; Preferably, the thickness of the ultrathin glass layer is 30-100 μm.

8. The impact-resistant ultrathin glass cover plate according to any one of claims 1-7, characterized in that, The thickness of the hardened layer is 1-15 μm, the thickness of the first buffer layer is 5-35 μm, and the thickness of the second buffer layer is 5-35 μm.

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

10. A display module, characterized in that, Includes the impact-resistant ultrathin glass cover as described in any one of claims 1-8.

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