Coating toughened ultrathin glass and preparation method thereof

Abstract

The invention provides coating toughened ultrathin glass and a preparation method thereof. The coating toughened ultrathin glass comprises ultrathin glass, a first buffer layer, a second buffer layer and a hardened layer, the first buffer layer is formed by coating one side surface of the ultra-thin glass with a UV curing coating containing modified polyurethane acrylate and thermoplastic acrylic resin and then curing; the second buffer layer is formed by coating the surface of the other side, opposite to the first buffer layer, of the ultra-thin glass and the end face of the periphery of the ultra-thin glass with a UV curing coating containing modified polyurethane acrylate and an active monomer and then curing the UV curing coating; the hardened layer is formed by coating a UV curing coating containing high-functionality polyurethane acrylate and an AF material on the surface of one side, far away from the ultra-thin glass, of the first buffer layer and then curing the UV curing coating. The ultra-thin glass is toughened through the coating with the gradient modulus characteristic, adaptive matching of the ultra-thin glass base material and the coating is achieved, meanwhile, the technical problem of edge protection is solved, and a more reliable cover plate solution is provided for folding screen equipment.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and particularly relates to a coated and toughened ultrathin glass and its preparation method. Background Technology

[0002] In recent years, the rapid development of flexible display technology has driven the commercialization of foldable screen devices, while simultaneously placing higher demands on the overall performance of cover glass materials. Traditional rigid glass, due to its high brittleness and poor flexibility, cannot meet the stringent usage requirements of foldable screen devices, which undergo hundreds of thousands of dynamic bends. While simple polymer materials (such as polyimide films) possess good flexibility, their surface hardness is insufficient (typically lower than 3H pencil hardness), making it difficult to meet the scratch resistance and optical transparency requirements of high-end display devices. This technological bottleneck severely restricts the reliability and user experience of foldable screen products.

[0003] To overcome the above limitations, the industry has proposed a solution for coated toughened glass, which achieves a material property of "rigidity and flexibility" by coating a functional polymer coating on an ultra-thin glass substrate. However, the existing technology still has the following key defects: (1) The traditional lamination process uses OCA optical adhesive to bond PET protective film, which leads to stress concentration at the interface and delamination during repeated folding; (2) The glass edges lack effective protection and are prone to edge chipping failure when the equipment is bumped; (3) The elastic modulus of the existing coating is poorly matched with the glass substrate. If the modulus is too high, the bending stress cannot be released, and if the modulus is too low, the surface compressive strength will be lost.

[0004] Against this backdrop, developing a new type of coated glass technology that combines excellent folding performance, edge impact resistance, and the advantages of large-scale production has become a core issue that urgently needs to be addressed in the field of foldable screens. Summary of the Invention

[0005] Based on the technical problems mentioned in the background, this invention proposes a coating-toughened ultrathin glass and its preparation method. By using a coating-toughened ultrathin glass with gradient modulus characteristics and an integrated coating process, the adaptability matching between the ultrathin glass substrate and the coating is achieved. At the same time, it overcomes the technical difficulties of edge protection and provides a more reliable cover plate solution for foldable screen devices.

[0006] The present invention proposes a coating-toughened ultrathin glass, comprising: ultrathin glass, a first buffer layer, a second buffer layer, and a hardening layer;

[0007] The first buffer layer is formed by applying a UV-curable coating, including modified polyurethane acrylate and thermoplastic acrylic resin, to one side surface of ultrathin glass and then curing it.

[0008] The second buffer layer is formed by applying a UV-curable coating, including modified polyurethane acrylate and active monomers, to the surface of the ultra-thin glass opposite to the first buffer layer and its four end faces, and then curing it.

[0009] The hardening layer is formed by applying a UV-curable coating, including high-functionality polyurethane acrylate and AF material, to the surface of the first buffer layer away from the ultra-thin glass and then curing it.

[0010] In this invention, because ultra-thin glass is flexible, thin, and fragile, especially its end face is easily damaged. Even a defect of a few micrometers can cause the ultra-thin glass layer to shatter. Therefore, when a UV-curable coating is applied to the surface of the ultra-thin glass opposite to the first buffer layer and cured to form a second buffer layer, the first and second buffer layers can work together to completely cover the ultra-thin glass layer, thereby protecting the edge of the ultra-thin glass layer. In this way, when the periphery of the ultra-thin glass layer is subjected to pressure or any stimulation, it can absorb the pressure and ensure that the glass edge is effectively protected.

[0011] Preferably, the raw materials of the UV-curable coating used in the first buffer layer include, by weight: 40-60 parts of modified polyurethane acrylate, 6-18 parts of thermoplastic acrylic resin, 2-6 parts of photoinitiator and 20-30 parts of organic solvent.

[0012] Preferably, the thickness of the first buffer layer is 5-35 μm.

[0013] In this invention, the first buffer layer is formed by using modified polyurethane acrylate as the main body and adding functional monomers (thermoplastic acrylic resin and / or active monomers, etc.) to form a UV-curable resin. On the one hand, it has excellent adhesion to glass and features low color intensity, high transmittance, yellowing resistance, UV resistance, medium hardness, and high surface smoothness. On the other hand, its flexibility and hardness are balanced. As the first buffer layer in this invention, it improves the overall impact resistance, bending resistance, and explosion-proof performance.

[0014] Specifically, the first buffer layer of the present invention can absorb and convert the energy transmitted from the upper layer into heat energy in the form of damping by its own deformation, and at the same time, it can prevent the transmission of deformation of the hardened layer and relieve the stress on the ultrathin glass.

[0015] Preferably, the raw materials of the UV-curable coating used in the second buffer layer include, by weight: 30-50 parts of modified polyurethane acrylate, 0-15 parts of thermoplastic acrylic resin, 0-20 parts of active monomer, 2-8 parts of photoinitiator and 0-20 parts of organic solvent.

[0016] Preferably, the thickness of the second buffer layer is 5-35 μm.

[0017] In this invention, the second buffer layer is formed by curing a solvent-based or solvent-free UV-curable coating, which has excellent adhesion to glass and features low color intensity, high transmittance, resistance to yellowing, low hardness, high creep recovery rate, and solvent-free properties. Its main function in this invention is to provide edge protection and buffer against explosions.

[0018] Specifically, the second buffer layer of the present invention is also essentially 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.

[0019] Preferably, the raw materials of the UV-curable coating used in the hardening layer include, by weight: 30-50 parts of high-functionality polyurethane acrylate, 6-18 parts of AF material, 3-7 parts of photoinitiator and 25-35 parts of organic solvent.

[0020] Preferably, the thickness of the hardened layer is 4-8 μm.

[0021] In this invention, the hardening layer is obtained by UV curing resin of high-functionality polyurethane acrylate and AF material. It has high degree of polymerization after curing, moderate shrinkage, high transparency, high surface hardness, abrasion resistance, high water droplet angle and toughness. As a hardening layer in this invention, it not only improves the overall hardness, wear resistance and toughness, but also has the tactile feel of glass, which enhances the user experience.

[0022] Specifically, after the hardened layer of this invention is applied, the overall impact resistance of the ultra-thin flexible glass can be effectively improved, thereby achieving protection for the ultra-thin glass.

[0023] Preferably, the modified polyurethane acrylate is obtained by a thiol-ene click reaction of a low-functionality polyurethane acrylate and a thiol;

[0024] Preferably, the low-functionality polyurethane acrylate is an aromatic polyurethane acrylate with less than trifunctionality, and the thiol is at least one of pentaerythritol tetrakis(3-mercaptopropionic acid), trimethylolpropane tris(3-mercaptopropionate), or 1,4-butanediol bis(3-mercaptobutyrate).

[0025] In this invention, a thiol-ene click reaction is carried out between low-functionality polyurethane acrylate and thiol, which results in carbon-sulfur bonds in the main resin, giving the resin good flexibility and facilitating the movement of molecular bonds.

[0026] Preferably, the active monomer is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, isopropyl methacrylate, or isobornyl acrylate.

[0027] Preferably, the high-functionality polyurethane acrylate is an aliphatic polyurethane acrylate with hexafunctionality or higher; the AF material is an organofluorosilicone modified polyurethane acrylate.

[0028] Preferably, the organofluorosilicone modified polyurethane acrylate is obtained by carrying out a thiol-ene click reaction with mercaptosilsesquioxane, fluorinated acrylate, and low-functionality polyurethane acrylate.

[0029] Preferably, the mercaptosilsesquioxane is mercaptopropyl-heptaisobutylsilsesquioxane, the fluorinated acrylate is perfluorooctyl ethyl acrylate or hexafluorobutyl acrylate, and the low-functionality polyurethane acrylate is an aromatic polyurethane acrylate with trifunctionality or less.

[0030] In this invention, on the one hand, using polyurethane acrylate prepolymers with hexamethylene or higher functionality can increase the crosslinking density of the resin in the coating, thereby improving the surface hardness of the hardened layer; on the other hand, using organofluorosilicone modified polyurethane acrylate as the AF material can introduce fluorocarbon chains and POSS structures, improve the hydrophobicity of the coating to obtain AF properties, and further enhance mechanical properties and dimensional stability.

[0031] Preferably, the photoinitiator is at least one of 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone, or 2,4,6-trimethylbenzoyl diphenylphosphine oxide; and the solvent is at least one of ethanol, isopropanol, ethyl acetate, butanone, butyl acetate, or propylene glycol methyl ether acetate.

[0032] The present invention also proposes a method for preparing the above-mentioned coated toughened ultrathin glass, comprising the following steps:

[0033] S1. Prepare ultra-thin glass;

[0034] S2. A second buffer layer is formed on one side surface and all four sides of the ultra-thin glass.

[0035] S3. A first buffer layer is formed on the surface of the ultrathin glass on the opposite side of the second buffer layer;

[0036] S4. A hardened layer is formed on the surface of the first buffer layer away from the ultra-thin glass.

[0037] The beneficial effects of this invention are:

[0038] (1) In this invention, by stacking multiple layers to toughen the ultra-thin glass layer, each layer undertakes different functions to achieve the preset performance requirements, so that the ultra-thin flexible glass as a whole has key performances such as high impact resistance, explosion resistance, and edge protection, providing a more reliable cover plate solution for foldable screen devices.

[0039] (2) In this invention, the mechanical properties and interfacial characteristics of the coating are precisely controlled by systematically adjusting the ratio of the main resin, other monomeric resins, and additives in the coating formulation, thereby achieving optimized matching with the stress of ultrathin flexible glass (UTG). Specifically, the selection of the main resin (sulfur-modified polyurethane acrylate or high-functionality polyurethane acrylate) can improve the crosslinking density and rigidity of the coating, while the appropriate introduction of flexible monomeric resins (thermoplastic acrylic resin, hydroxypropyl methacrylate, hydroxyethyl acrylate, and isobornyl acrylate, etc., active monomers) can enhance the deformation capability of the coating. At the same time, the addition of a specific proportion of organofluorosilicone-modified polyurethane acrylate can improve the AF of the coating; this multi-component synergistic control method enables the shrinkage stress of the coating during the curing process to reach a dynamic balance with the inherent stress of the UTG, which not only avoids the glass warping problem caused by stress mismatch, but also ensures the interfacial stability of the coating under repeated bending conditions. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the coated and toughened ultrathin glass described in this invention. Detailed Implementation

[0041] Example 1

[0042] Reference Figure 1 This embodiment proposes a coating-toughened ultrathin glass, comprising: ultrathin glass B, a first buffer layer A and a second buffer layer D located on opposite sides of the ultrathin glass, and a hardening layer C located on the side of the first buffer layer A away from the ultrathin glass B; the second buffer layer D includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass.

[0043] The aforementioned ultrathin glass B is UTG ultrathin high-alumina glass with a thickness of 30μm;

[0044] The first buffer layer A is obtained by mixing 50 parts by weight of sulfur-modified polyurethane acrylate, 12 parts by weight of thermoplastic acrylic resin (Mitsubishi Rayon 106), 4 parts by weight of 1-hydroxycyclohexylphenyl ketone, and 25 parts by weight of ethyl acetate to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass B and cured under ultraviolet light. The ultraviolet light intensity is 600 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0045] The thickness of the first buffer layer A is 20 μm;

[0046] The material of the second buffer layer D is the same as that of the first buffer layer A, and the thickness is 20μm;

[0047] Hardening layer C is formed by mixing 40 parts by weight of 12-functional polyurethane acrylate, 12 parts by weight of AF material, 5 parts by weight of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, and 30 parts by weight of ethyl acetate to form a UV-curable coating. This coating is then applied to the surface of the first buffer layer away from the ultra-thin glass B and cured under ultraviolet light. The ultraviolet light intensity is 800 mJ / cm. 2 The AF material is prepared by the following method: Polyurethane acrylate (SM6329) and 10 wt% hexafluorobutyl acrylate (SM6329) are stirred and dissolved. Then, 15 wt% mercaptopropyl-heptaisobutylsilsesquioxane (SM6329) and 3 wt% 2,2-dimethoxy-2-phenylacetophenone (SM6329) are added. After stirring and mixing for 1 hour, the mixture is then subjected to a strength of 3 W / cm. 2 The AF material was obtained by irradiating it with a UV lamp for 5 minutes to carry out a thiol-olefin click reaction.

[0048] The thickness of the hardened layer is 6 μm.

[0049] Example 2

[0050] This embodiment also proposes a coating-toughened ultrathin glass, including: ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass;

[0051] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0052] The first buffer layer is the same as the first buffer layer in Example 1;

[0053] The second buffer layer is formed by mixing 40 parts by weight of sulfur-modified polyurethane acrylate, 6 parts by weight of thermoplastic acrylic resin (Mitsubishi Rayon 106), 10 parts by weight of isobornyl acrylate, 6 parts by weight of 1-hydroxycyclohexylphenyl ketone, and 20 parts by weight of ethyl acetate to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 700 mJ / cm. 2The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0054] The thickness of the second buffer layer is 20 μm;

[0055] The hardened layer is the same as the hardened layer in Example 1.

[0056] Example 3

[0057] This embodiment also proposes a coating-toughened ultrathin glass, including: ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass;

[0058] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0059] The first buffer layer is formed by mixing 40 parts by weight of sulfur-modified polyurethane acrylate, 18 parts by weight of thermoplastic acrylic resin (Mitsubishi Rayon 106), 2 parts by weight of 1-hydroxycyclohexylphenyl ketone, and 30 parts by weight of ethyl acetate to form a UV-curable coating, which is then coated onto one side of an ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 600 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0060] The thickness of the first buffer layer is 20 μm;

[0061] The second buffer layer is the same as the second buffer layer in Example 2;

[0062] The hardened layer is the same as the hardened layer in Example 1.

[0063] Example 4

[0064] This embodiment also proposes a coating-toughened ultrathin glass, including: ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass;

[0065] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0066] The first buffer layer is formed by mixing 60 parts by weight of sulfur-modified polyurethane acrylate, 6 parts by weight of thermoplastic acrylic resin (Mitsubishi Rayon 106), 6 parts by weight of 1-hydroxycyclohexylphenyl ketone, and 20 parts by weight of ethyl acetate to form a UV-curable coating, which is then coated onto one side of an ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 600 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0067] The thickness of the first buffer layer is 20 μm;

[0068] The second buffer layer is formed by mixing 40 parts by weight of sulfur-modified polyurethane acrylate, 5 parts by weight of hydroxyethyl acrylate, 10 parts by weight of isobornyl acrylate, 5 parts by weight of isopropyl methacrylate, and 6 parts by weight of 1-hydroxycyclohexylphenyl ketone to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 700 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0069] The thickness of the second buffer layer is 20 μm;

[0070] The hardened layer is the same as the hardened layer in Example 1.

[0071] Example 5

[0072] This embodiment also proposes a coating-toughened ultrathin glass, including: ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass;

[0073] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0074] The first buffer layer is the same as the first buffer layer in Example 3;

[0075] The second buffer layer is formed by mixing 40 parts by weight of sulfur-modified polyurethane acrylate, 5 parts by weight of isooctyl acrylate, 10 parts by weight of isobornyl acrylate, 5 parts by weight of hydroxyethyl methacrylate, and 6 parts by weight of 1-hydroxycyclohexylphenyl ketone to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 700 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0076] The thickness of the second buffer layer is 20 μm;

[0077] The hardened layer is the same as the hardened layer in Example 1.

[0078] Example 6

[0079] This embodiment also proposes a coating-toughened ultrathin glass, including: ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass;

[0080] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0081] The first buffer layer is the same as the first buffer layer in Example 3;

[0082] The second buffer layer is formed by mixing 30 parts by weight of sulfur-modified polyurethane acrylate, 5 parts by weight of hydroxyethyl acrylate, 10 parts by weight of isobornyl acrylate, 5 parts by weight of isopropyl methacrylate, and 8 parts by weight of 1-hydroxycyclohexylphenyl ketone to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 700 mJ / cm. 2 The sulfur-modified polyurethane acrylate is prepared by the following method: Polyurethane acrylate (SM6329) is heated to 85°C and melted. Then, 10 wt% of pentaerythritol tetrakis(3-mercaptopropionic acid) ester and 2 wt% of 2-hydroxy-2-methylphenylacetone ester (SM6329) are added. After stirring and mixing, the mixture is prepared at a strength of 3 W / cm². 2 The sulfur-modified polyurethane acrylate was obtained by irradiating it under a UV lamp for 3 minutes to carry out a thiol-olefin click reaction.

[0083] The thickness of the second buffer layer is 20 μm;

[0084] The hardened layer is the same as the hardened layer in Example 1.

[0085] Comparative Example 1

[0086] This comparative example also proposes a coating-toughened ultrathin glass, comprising: an ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer comprises a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass.

[0087] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0088] The first buffer layer is the same as the first buffer layer in Example 1;

[0089] The second buffer layer is obtained by coating a colorless and transparent polyimide (CPI) solution onto one side of an ultrathin glass surface and then heat-curing it.

[0090] The thickness of the second buffer layer is 20 μm;

[0091] The hardened layer is the same as the hardened layer in Example 1.

[0092] Comparative Example 2

[0093] This comparative example also proposes a coating-toughened ultrathin glass, comprising: an ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer comprises a first portion covering one side of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass.

[0094] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0095] The first buffer layer is formed by mixing 50 parts by weight of polyurethane acrylate (SM6329), 12 parts by weight of thermoplastic acrylic resin (Mitsubishi Rayon 106), 4 parts by weight of 1-hydroxycyclohexylphenyl ketone, and 25 parts by weight of ethyl acetate to form a UV-curable coating, which is then coated onto one side of an ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 600 mJ / cm. 2 ;

[0096] The thickness of the first buffer layer is 20 μm;

[0097] The second buffer layer is formed by mixing 40 parts by weight of polyurethane acrylate (SM6329), 5 parts by weight of hydroxyethyl acrylate, 10 parts by weight of isobornyl acrylate, 5 parts by weight of isopropyl methacrylate, and 6 parts by weight of 1-hydroxycyclohexylphenyl ketone to form a UV-curable coating, which is then coated onto one side of the ultra-thin glass surface and cured under ultraviolet light. The ultraviolet light intensity is 700 mJ / cm. 2 ;

[0098] The thickness of the second buffer layer is 20 μm;

[0099] The hardened layer is the same as the hardened layer in Example 1.

[0100] Comparative Example 3

[0101] This comparative example proposes a coating-toughened ultrathin glass, comprising: an ultrathin glass, a first buffer layer and a second buffer layer located on opposite sides of the ultrathin glass, and a hardening layer located on the side of the first buffer layer away from the ultrathin glass; the second buffer layer includes a first portion covering one side surface of the ultrathin glass and a second portion covering the opposite end face of the ultrathin glass.

[0102] The aforementioned ultra-thin glass is UTG ultra-thin high-alumina glass with a thickness of 30μm;

[0103] The first buffer layer is the same as the first buffer layer in Example 1;

[0104] The second buffer layer is the same as the second buffer layer in Example 4;

[0105] The hardening layer is formed by mixing 40 parts by weight of 12-functional polyurethane acrylate, 12 parts by weight of polyurethane acrylate (SM6329), 5 parts by weight of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, and 30 parts by weight of ethyl acetate to form a UV-curable coating. This coating is then applied to the surface of the first buffer layer away from the ultra-thin glass and cured under ultraviolet light. The ultraviolet light intensity is 800 mJ / cm. 2 ;

[0106] The thickness of the hardened layer is 20 μm.

[0107] The properties of the coated and toughened ultrathin glass obtained in the above embodiments and comparative examples are shown in Table 1 below:

[0108] Table 1. Performance test results of the ultrathin flexible glass described in the embodiments and comparative examples.

[0109]

[0110] As shown in Table 1 above, the ultrathin flexible glass described in this application has good bending performance.

[0111] 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. A coated and toughened ultrathin glass, characterized in that, include: Ultra-thin glass, first buffer layer, second buffer layer, and hardening layer; The first buffer layer is formed by applying a UV-curable coating, including modified polyurethane acrylate and thermoplastic acrylic resin, to one side surface of ultrathin glass and then curing it. The second buffer layer is formed by applying a UV-curable coating, including modified polyurethane acrylate and active monomers, to the surface of the ultra-thin glass opposite to the first buffer layer and its four end faces, and then curing it. The hardening layer is formed by applying a UV-curable coating, including high-functionality polyurethane acrylate and AF material, to the surface of the first buffer layer away from the ultra-thin glass and then curing it.

2. The coated and toughened ultrathin glass according to claim 1, characterized in that, The raw materials of the UV-curable coating used in the first buffer layer include, by weight: 40-60 parts of modified polyurethane acrylate, 6-18 parts of thermoplastic acrylic resin, 2-6 parts of photoinitiator and 20-30 parts of organic solvent. Preferably, the thickness of the first buffer layer is 5-35 μm.

3. The coated and toughened ultrathin glass according to claim 1 or 2, characterized in that, The raw materials of the UV-curable coating used in the second buffer layer include, by weight: 30-50 parts of modified polyurethane acrylate, 0-15 parts of thermoplastic acrylic resin, 0-20 parts of active monomer, 2-8 parts of photoinitiator and 0-20 parts of organic solvent. Preferably, the thickness of the second buffer layer is 5-35 μm.

4. The coated and toughened ultrathin glass according to any one of claims 1-3, characterized in that, The raw materials of the UV-curable coating used in the hardening layer include, by weight: 30-50 parts of high-functionality polyurethane acrylate, 6-18 parts of AF material, 3-7 parts of photoinitiator and 25-35 parts of organic solvent. Preferably, the thickness of the hardened layer is 4-8 μm.

5. The coated and toughened ultrathin glass according to claim 2 or 3, characterized in that, The modified polyurethane acrylate is obtained by carrying out a thiol-ene click reaction between a low-functionality polyurethane acrylate and a thiol. Preferably, the low-functionality polyurethane acrylate is an aromatic polyurethane acrylate with less than trifunctionality, and the thiol is at least one of pentaerythritol tetrakis(3-mercaptopropionic acid), trimethylolpropane tris(3-mercaptopropionate), or 1,4-butanediol bis(3-mercaptobutyrate).

6. The coated and toughened ultrathin glass according to claim 3, characterized in that, The active monomer is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, isooctyl acrylate, hydroxyethyl methacrylate, isopropyl methacrylate, or isobornyl acrylate.

7. The coated and toughened ultrathin glass according to claim 4, characterized in that, The high-functionality polyurethane acrylate is an aliphatic polyurethane acrylate with hexafunctionality or higher; the AF material is an organofluorosilicone modified polyurethane acrylate.

8. The coated and toughened ultrathin glass according to claim 7, characterized in that, The organofluorosilicone modified polyurethane acrylate is obtained by carrying out a thiol-ene click reaction with mercaptosilsesquioxane, fluorinated acrylate, and low-functionality polyurethane acrylate. Preferably, the mercaptosilsesquioxane is mercaptopropyl-heptaisobutylsilsesquioxane, the fluorinated acrylate is perfluorooctyl ethyl acrylate or hexafluorobutyl acrylate, and the low-functionality polyurethane acrylate is an aromatic polyurethane acrylate with trifunctionality or less.

9. The coated and toughened ultrathin glass according to any one of claims 2-4, characterized in that, The photoinitiator is at least one of 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone, or 2,4,6-trimethylbenzoyl diphenylphosphine oxide; the solvent is at least one of ethanol, isopropanol, ethyl acetate, butanone, butyl acetate, or propylene glycol methyl ether acetate.

10. A method for preparing the coated and toughened ultrathin glass according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Prepare ultra-thin glass; S2. A second buffer layer is formed on one side surface and all four sides of the ultra-thin glass. S3. A first buffer layer is formed on the surface of the ultrathin glass on the opposite side of the second buffer layer; S4. A hardened layer is formed on the surface of the first buffer layer away from the ultra-thin glass.

Images