CFG ultra-thin glass, preparation method and application thereof

Abstract

The application provides CFG ultra-thin glass and a preparation method and application thereof. The CFG ultra-thin glass comprises a plastic zone and a non-plastic zone, the plastic zone comprises a flat zone and symmetrically distributed slope zones on both sides of the flat zone, and the slope zones are smoothly connected with the non-plastic zone and the flat zone; the width of the flat zone is 5mm-20mm; and the width of the slope zone is 1mm-5mm. The preparation method is simple and efficient, has a strong cost advantage, and the CFG ultra-thin glass prepared by the preparation method has a smooth gradient transition zone and can effectively reduce the rebound force of the CFG.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of glass processing forming, and relates to a CFG ultra-thin glass, a preparation method and application thereof. BACKGROUND

[0002] In recent years, domestic mobile phone terminals gradually introduce folding screen mobile phones, and the main cover plate adopts UTG (Ultra-Thin Glass) as the main material. In the coming years, UTG will be in short supply.

[0003] With the gradual introduction of folding mobile phones by terminals, the early UTG can achieve the function of replacing CPI (polyimide) in terms of functionality. Since the main raw material of UTG is glass, it has a certain rigidity. In order to reduce the technical problem of terminal UTG rebound force, it is necessary to provide a CFG (Center Folded Glass) ultra-thin glass.

[0004] CN112939474A discloses a production method of ultra-thin non-equal-thickness glass, which comprises the following steps: 1) thinning the thickness of the folding area; 2) coating the non-folding area of the ultra-thin glass, tempering the folding area, and then removing the film layer of the non-folding area; 3) coating the folding area, tempering the non-folding area, and removing the film layer of the folding area. In step 1), the folding area is thinned by acid etching. Before acid etching, acid-resistant protective films are covered on the surfaces of the ultra-thin glass except the folding area. After the first acid etching, the acid-resistant protective films are removed, and after cleaning and drying, the acid-resistant protective films are re-covered for acid etching. The position of the acid-resistant protective film near the folding area is 1-4 mm closer to the center of the ultra-thin glass than the previous position. This step is repeated until the thickness of the folding area meets the requirements. The method provided by the present application for thinning the thickness of the folding area is relatively complicated, and the processing stability is poor.

[0005] Therefore, in the field, it is expected to develop a simple and efficient preparation method of CFG ultra-thin glass. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a CFG ultra-thin glass, a preparation method and application thereof. The preparation method of the present application is simple and efficient, has strong cost advantage, and the CFG ultra-thin glass prepared by the preparation method of the present application has smooth gradient transition area and can effectively reduce the rebound force of CFG.

[0007] To achieve this application purpose, the following technical solutions are adopted:

[0008] In a first aspect, the present application provides a CFG ultra-thin glass, comprising a plasticized region and a non-plasticized region, wherein the plasticized region comprises a flat region and symmetrically distributed slope regions on both sides of the flat region, and the slope regions smoothly transition to the non-plasticized region and the flat region.

[0009] The width of the flat region is 5-20 mm, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, etc.

[0010] The width of the slope region is 1-5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, etc.

[0011] The slope region of the CFG ultra-thin glass of the present application smoothly transitions to the non-plasticized region and the flat region, which can effectively reduce the rebound force of the CFG.

[0012] Preferably, the thickness of the non-plasticized region is 20-150 μm, for example, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc.

[0013] Preferably, the depth of the flat region is 10-100 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm, etc.

[0014] Preferably, the upper surface and / or the lower surface of the CFG ultra-thin glass is provided with a plasticized region.

[0015] In a second aspect, the present application provides a preparation method of the CFG ultra-thin glass of the first aspect, comprising the following steps:

[0016] (1) Film coating: an acid-resistant film is attached to one side of the ultra-thin glass (UTG);

[0017] (2) Plasticizing: the ultra-thin glass of step (1) is loaded into a plasticizing device, and then the plasticizing device is immersed in an etching solution for 1-2 min (for example, 1 min, 1.5 min or 2 min, etc.), and then the plasticizing device is uniformly lowered or the etching solution is added to make the liquid level uniformly rise, to obtain the plasticized ultra-thin glass;

[0018] (3) Chemical strengthening: one end of the non-plasticized region of the plasticized ultra-thin glass is immersed in a potassium nitrate solution, and then the other end of the non-plasticized region of the ultra-thin glass is immersed in the potassium nitrate solution, and then the whole ultra-thin glass is immersed in the potassium nitrate solution, to obtain the CFG ultra-thin glass.

[0019] In the present application, ≤30 pieces of ultra-thin glass can be loaded into the plastic molding device at one time, improving production efficiency, and using the plastic molding device of the present application can ensure that each piece of ultra-thin glass has the same thinning effect, improving production stability. In addition, the preparation method of the present application does not require yellow light process or polishing and repairing process, avoids using expensive photoresist manufacturing process or physical coarse / fine grinding manufacturing process, has low processing cost, and has the convenience of movement after processing.

[0020] In the present application, by immersing the plastic molding device in the etching solution for 1-2 min, a flat area can be formed, and then by uniformly lowering the plastic molding device or adding etching solution to make the liquid level rise uniformly, a smooth transition slope area can be formed, avoiding the production of sharp corners at the junction of the plastic molding area and the non-plastic molding area. According to the customer's demand for the width of the flat area of the product, the immersion time of the plastic molding device in the etching solution can be adaptively adjusted; according to the customer's demand for the width of the slope area of the product, the speed and time of uniformly lowering the plastic molding device or uniformly rising the liquid level of the etching solution can be adaptively adjusted. And in the actual operation process, the plastic molding can be carried out back and forth many times according to the demand, such as when the plastic molding is carried out by uniformly lowering the plastic molding device, the plastic molding device is first uniformly lowered, and then uniformly raised, and the cycle is repeated many times. The total thinning time is usually controlled within 5-20 min.

[0021] In the present application, if it is necessary to plastic mold both sides of the ultra-thin glass, the ultra-thin glass is taken out from the plastic molding device after step (2) is performed, the acid-resistant film is removed, and the acid-resistant film is attached to the already molded side, and step (2) is repeated again.

[0022] It should be noted that the preparation method of the present application can form a plastic molding area at the middle position of the ultra-thin glass, or at any other position.

[0023] Preferably, the thickness of the ultra-thin glass in step (1) is 20-150 μm, such as 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc.

[0024] Preferably, the preparation method of the ultra-thin glass (UTG) in step (1) comprises the following steps:

[0025] 1) Cutting: The raw material glass with a thickness of 0.2-1 mm is cut into the required size, and the L size is usually designed to be 400-1000 mm; the W size is usually designed to be 500-1300 mm.

[0026] 2) Chemical thinning: The glass after cutting is installed into an etching basket, and is placed into an etching machine (immersion type \ top spray type) to perform chemical thinning to form a UTG large plate substrate. The thickness of the thinned glass is usually 0.02mm~0.15mm, and the thickness tolerance is controlled within ±0.003mm. After the chemical thinning is completed, the UTG large plate substrate is cleaned.

[0027] 3) Laser cutting: The edge of the UTG large plate substrate is cut by using a femtosecond IR laser, and the cutting edge collapse is controlled within ±0.002mm, thereby forming a UTG large plate glass.

[0028] 4) Stacking:

[0029] Stacking processing: The UTG large plate glass is stacked by multiple layers through an automatic device, and the UV type hydrolysis glue is used to isolate the UTG large plate glasses, wherein the hydrolysis glue contains particle ions with a Dmax of 0.010mm~0.050mm for supporting the UTG large plate glass; the number of stacked layers of the UTG is usually designed to be 1~20 layers (i.e. 1~20 UTG large plates), and the thick glass with a thickness of 0.5mm~1mm is used to isolate the upper and lower layers and the middle layer, and the glue solidification is automatically completed by the device.

[0030] Forming rough cutting: The UTG large plate glass after the stacking is completed is placed into a cutting machine to perform rough cutting. According to the forming size requirements, the L\W size is enlarged by 0.8mm~1.8mm.

[0031] CNC fine processing: The multiple layer UTG small plate glass after cutting is placed into a high-precision CNC to perform accurate processing of the shape and size. The processing size is designed according to the forming size, and the processing requirements of the special-shaped size can also be met.

[0032] Edge plasticity: The UTG small plate glass after fine processing is placed into an etching solution mainly containing HF to perform edge etching, so that the edge shape is etched into a pestle type. The small plate UTG after the edge plasticity is completed is cut.

[0033] Preferably, the acid-resistant film of step (1) comprises any one of a PVC film, a PP film or a PET film. The acid-resistant film used in the present application is a common commercially available acid-resistant film, and the surface of the acid-resistant film is coated with an adhesive.

[0034] Preferably, the thickness of the acid-resistant film of step (1) is 50μm~300μm, such as 50μm, 80μm, 100μm, 130μm, 150μm, 180μm, 200μm, 230μm, 250μm, 280μm or 300μm, etc.

[0035] Preferably, the speed of the uniform speed descending in step (2) is 0.05-2 mm / min, such as 0.05 mm / min, 0.1 mm / min, 0.2 mm / min, 0.3 mm / min, 0.4 mm / min, 0.5 mm / min, 0.6 mm / min, 0.7 mm / min, 0.8 mm / min, 0.9 mm / min, 1 mm / min, 1.1 mm / min, 1.2 mm / min, 1.3 mm / min, 1.4 mm / min, 1.5 mm / min, 1.6 mm / min, 1.7 mm / min, 1.8 mm / min, 1.9 mm / min or 2 mm / min, etc.

[0036] Preferably, the speed of the uniform speed ascending in step (2) is 0.05-2 mm / min, such as 0.05 mm / min, 0.1 mm / min, 0.2 mm / min, 0.3 mm / min, 0.4 mm / min, 0.5 mm / min, 0.6 mm / min, 0.7 mm / min, 0.8 mm / min, 0.9 mm / min, 1 mm / min, 1.1 mm / min, 1.2 mm / min, 1.3 mm / min, 1.4 mm / min, 1.5 mm / min, 1.6 mm / min, 1.7 mm / min, 1.8 mm / min, 1.9 mm / min or 2 mm / min, etc.

[0037] If the speed of the uniform speed descending or the uniform speed ascending is too fast, the slope gradient cannot be formed.

[0038] Preferably, the concentration of the potassium nitrate solution in step (3) is 95%-99.95%, such as 95%, 96%, 97%, 98%, 99% or 99.95%, etc.

[0039] Preferably, the time of immersing one end of the non-molding area of the shaped ultrathin glass into the potassium nitrate solution in step (3) is 10-30 min, such as 10 min, 15 min, 20 min, 25 min or 30 min, etc.

[0040] Preferably, the time of immersing the other end of the non-molding area of the ultrathin glass into the potassium nitrate solution in step (3) is 10-30 min, such as 10 min, 15 min, 20 min, 25 min or 30 min, etc.

[0041] Preferably, the time of immersing the whole ultrathin glass into the potassium nitrate solution in step (3) is 10-20 min, such as 10 min, 12 min, 15 min, 18 min or 20 min, etc.

[0042] As a preferred technical scheme of the present application, the non-plastic forming area of the ultra-thin glass is first chemically strengthened, and then the whole ultra-thin glass is chemically strengthened, so that the tensile stress of the whole CFG ultra-thin glass is close. If the whole CFG is chemically strengthened at one time according to the traditional chemical strengthening method, when the strengthening depth of the non-plastic forming area exceeds the strengthening depth of the plastic forming area, the plastic forming area will have a self-explosion phenomenon.

[0043] In order to make the tensile stress value of the whole CFG close, the strengthening time of the plastic forming area / non-plastic forming area is adjusted to adjust the strengthening depth, so as to realize the consistency of the tensile stress.

[0044] The CT calculation formula is as follows:

[0045] CT = (CS * DOL) / (measured point glass thickness - 2 * DOL), wherein CT is the tensile stress; CS is the compressive stress; DOL is the chemical strengthening depth.

[0046] In order to make the CT value of the whole CFG close, the present application realizes the CT value close by adopting three-stage chemical strengthening. The specific implementation steps are as follows:

[0047] Step A: First, the non-plastic forming area of the ultra-thin glass is chemically strengthened, and the strengthening depth is: the DOL target value of one end of the non-plastic forming area - the DOL target value of the plastic forming area.

[0048] Step B: Then, the other end of the non-plastic forming area of the ultra-thin glass is chemically strengthened, and the strengthening depth is: the DOL target value of the other end of the non-plastic forming area - the DOL target value of the plastic forming area.

[0049] Step C: Finally, the whole ultra-thin glass is chemically strengthened, and the strengthening depth is: the DOL target value of the plastic forming area.

[0050] Preferably, the plastic forming device of step (2) comprises a plastic block, a positioning block, a CFG fixing block, a side plate, and a connecting rod, wherein the plastic block is vertically fixed on the side plate, the positioning block is located above the plastic block and is vertically fixed on the side plate, the CFG fixing block is located outside the positioning block and is connected with the positioning block, and one end of the connecting rod is fixed in parallel with the side plate.

[0051] The plastic block has an arc structure.

[0052] The CFG shaping device of the present application has the functions of ultra-thin glass fixing and bending diameter adjustment, and can ensure the consistency of the bending shape of multiple pieces of ultra-thin glass. The shaping block is a modular device, which can be adjusted or replaced according to the characteristics of CFG. Generally, the shaping block device can satisfy the adjustment of the shaping radius between R10 and R50. The positioning block is placed above the shaping block, and the positioning block adjusts the bending diameter of the ultra-thin glass together with the shaping block. When the positioning block is moved outward, the bending diameter becomes larger, and when the positioning block is moved inward, the bending diameter becomes smaller. Generally, the bending radius of the ultra-thin glass is designed to be 5mm-30mm, such as 5mm, 8mm, 10mm, 13mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm or 30mm, etc. The CFG fixing block is connected with the positioning block, and the CFG fixing block is installed after the ultra-thin glass is placed. One end of the connecting rod is connected with the side plate, and the other end is connected with the equipment mechanism, which is used for fixing the device. Since the shaping device involves chemical corrosion solvent, the parts are made of corrosion-resistant materials.

[0053] Preferably, the step (2) of loading the ultra-thin glass of step (1) into the shaping device comprises the following steps:

[0054] The ultra-thin glass is placed outside the shaping block and the positioning block, wherein the side with the acid-resistant film is in contact with the shaping block and the positioning block, and then the CFG fixing block is installed.

[0055] In the present application, the outside refers to the side in contact with the etching solution when the shaping device is immersed in the etching solution.

[0056] In a third aspect, the present application provides the application of the CFG ultra-thin glass of the first aspect in a folding screen.

[0057] Compared with the prior art, the present application has the following beneficial effects:

[0058] (1) The slope area of the CFG ultra-thin glass of the present application smoothly transitions with the non-shaping area and the flat area, which can effectively reduce the rebound force of CFG.

[0059] (2) In the present application, ≤30 pieces of ultra-thin glass can be loaded into the shaping device at one time, which improves the production efficiency. Moreover, the shaping device of the present application can ensure that each piece of ultra-thin glass has the same thinning effect, which improves the production stability and has a strong cost advantage. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 The structural schematic diagram of the CFG ultra-thin glass provided for embodiments 1-3 of the present application.

[0061] Wherein, A-shaped area, B-non-shaped area, A1-flat area, A2-sloping area, L1-width of the slope area, L2-depth of the flat area, L3-thickness of the non-shaped area, and L4-width of the flat area.

[0062] Figure 2 This is a schematic diagram of the molding device of the present invention.

[0063] Among them, 001-molding block, 002-positioning block, 003-CFG fixing block, 004-side plate, and 005-connecting rod.

[0064] Figure 3 This is a schematic diagram of the molding device of the present invention immersed in the etching solution.

[0065] Among them, 001-molding block, 002-positioning block, 003-CFG fixing block, 011-CFG ultra-thin glass; 012-etching solution.

[0066] Figure 4 This is a schematic diagram of the structure of the CFG ultrathin glass provided in Embodiment 4 of the present invention. Detailed Implementation

[0067] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0068] Example 1

[0069] This embodiment provides a method such as Figure 1 The CFG ultrathin glass shown includes a molding region A and a non-molded region B. The molding region A includes a flat region A1 and symmetrically distributed slope regions A2 located on both sides of the flat region. The slope regions A2 smoothly transition from the non-molded region B and the flat region A1. The width L4 of the flat region A1 is 5 mm. The width L1 of the slope region A2 is 1 mm. The thickness L3 of the non-molded region B is 50 μm. The depth L2 of the flat region A1 is 20 μm.

[0070] The upper surface of the CFG ultrathin glass has a molding zone.

[0071] The preparation method includes the following steps:

[0072] (1) Coating: An acid-resistant film is laminated onto one side of the ultra-thin glass;

[0073] (2) Shaping: The ultra-thin glass from step (1) is loaded into the shaping device, and then the shaping device is immersed in the etching solution for 1 minute. Then the shaping device is lowered at a constant speed of 0.5 mm / s to obtain the shaped ultra-thin glass.

[0074] (3) Chemical strengthening: Immerse one end of the non-molded area of ​​the shaped ultrathin glass in potassium nitrate solution for 20 min, then immerse the other end of the non-molded area of ​​the ultrathin glass in potassium nitrate solution for 20 min, and then immerse the entire ultrathin glass in potassium nitrate solution for 15 min to obtain the CFG ultrathin glass.

[0075] Wherein, the thickness of the ultra-thin glass in step (1) is 50 μm; the acid-resistant film in step (1) is a PVC film with a thickness of 50 μm; and the concentration of the potassium nitrate solution in step (3) is 95%.

[0076] The molding device described in step (2) is as follows Figure 2 As shown, it includes a molding block 001, a positioning block 002, a CFG fixing block 003, a side plate 004, and a connecting rod 005. The molding block 001 is vertically fixed on the side plate 004. The positioning block 002 is located above the molding block 001 and is vertically fixed on the side plate 004. The CFG fixing block 003 is located outside the positioning block 002 and is connected to the positioning block 002. One end of the connecting rod 005 is fixed parallel to the side plate 004. The molding block has an arc-shaped structure.

[0077] Step (2) involves loading the ultrathin glass from step (1) into the molding device, specifically including the following steps:

[0078] The ultra-thin glass is placed on the outside of the molding block 001 and the positioning block 002, wherein the side with the acid-resistant film is in contact with the molding block and the positioning block, and then the CFG fixing block 003 is installed.

[0079] A schematic diagram of the molding device immersed in the etching solution is shown below. Figure 3 As shown.

[0080] Example 2

[0081] This embodiment provides a method such as Figure 1 The CFG ultrathin glass shown includes a molding region A and a non-molded region B. The molding region A includes a flat region A1 and symmetrically distributed slope regions A2 located on both sides of the flat region. The slope regions A2 smoothly transition from the non-molded region B and the flat region A1. The width L4 of the flat region A1 is 10 mm; the width L1 of the slope region A2 is 1.5 mm; the thickness L3 of the non-molded region B is 70 μm; and the depth L2 of the flat region A1 is 40 μm.

[0082] The upper surface of the CFG ultrathin glass has a molding zone.

[0083] The preparation method includes the following steps:

[0084] (1) Coating: An acid-resistant film is laminated onto one side of the ultra-thin glass;

[0085] (2) Shaping: the ultra-thin glass of step (1) is loaded into a shaping device, then the shaping device is immersed in an etching solution for 1.5 min, and then the shaping device is lowered at a speed of 1 mm / s, to obtain the shaped ultra-thin glass;

[0086] (3) Chemical strengthening: one end of the shaped ultra-thin glass is immersed in a potassium nitrate solution for 10 min, then the other end of the shaped ultra-thin glass is immersed in the potassium nitrate solution for 10 min, and then the entire shaped ultra-thin glass is immersed in the potassium nitrate solution for 10 min, to obtain the CFG ultra-thin glass.

[0087] In step (1), the thickness of the ultra-thin glass is 70 μm; in step (1), the acid-resistant film is a PP film with a thickness of 100 μm; and in step (3), the concentration of the potassium nitrate solution is 96%.

[0088] The shaping device and the step of loading the ultra-thin glass into the shaping device in this embodiment are the same as those in Embodiment 1.

[0089] Embodiment 3

[0090] In this embodiment, a CFG ultra-thin glass as shown in Figure 1 includes a shaped region A and a non-shaped region B, the shaped region A includes a flat region A1 and symmetrically distributed slope regions A2 on both sides of the flat region A1, and the slope regions A2 smoothly transition to the non-shaped region B and the flat region A1; the width L4 of the flat region A1 is 20 mm; the width L1 of the slope region A2 is 2 mm; the thickness L3 of the non-shaped region B is 100 μm; and the depth L2 of the flat region A1 is 70 μm.

[0091] In the CFG ultra-thin glass, the upper surface is provided with a shaped region.

[0092] The preparation method includes the following steps:

[0093] (1) Film coating: an acid-resistant film is attached to one side of the ultra-thin glass;

[0094] (2) Shaping: the ultra-thin glass of step (1) is loaded into a shaping device, then the shaping device is immersed in an etching solution for 2 min, and then the shaping device is added with the etching solution at a speed of 2 mm / s to make the liquid level rise at a constant speed, to obtain the shaped ultra-thin glass;

[0095] (3) Chemical strengthening: one end of the shaped ultra-thin glass is immersed in a potassium nitrate solution for 30 min, then the other end of the shaped ultra-thin glass is immersed in the potassium nitrate solution for 30 min, and then the entire shaped ultra-thin glass is immersed in the potassium nitrate solution for 20 min, to obtain the CFG ultra-thin glass.

[0096] The thickness of the ultra-thin glass in step (1) is 100 μm; the acid-resistant film in step (1) is a PET film with a thickness of 300 μm; and the concentration of the potassium nitrate solution in step (3) is 97%.

[0097] The molding device and the step of loading the ultra-thin glass into the molding device in this embodiment are the same as those in Embodiment 1.

[0098] Embodiment 4

[0099] In this embodiment, a CFG ultra-thin glass is provided, which comprises a molding region and a non-molding region, the molding region comprises a flat region and symmetrically distributed slope regions on both sides of the flat region, and the slope regions smoothly transition to the non-molding region and the flat region; the width of the flat region is 10 mm; the width of the slope region is 5 mm; the thickness of the non-molding region is 150 μm; and the depth of the flat region is 50 μm.

[0100] The upper surface and the lower surface of the CFG ultra-thin glass are both provided with a molding region, as shown in Figure 4 .

[0101] The preparation method comprises the following steps:

[0102] (1) Film coating: an acid-resistant film is attached to one side of the ultra-thin glass;

[0103] (2) Molding: the ultra-thin glass in step (1) is loaded into a molding device, then the molding device is immersed in an etching solution for 1.5 min, and then the molding device is uniformly lowered at a speed of 1 mm / s and taken out;

[0104] (3) Film coating: an acid-resistant film is attached to the side of the ultra-thin glass that has been molded;

[0105] (4) Molding: the ultra-thin glass in step (3) is loaded into a molding device, then the molding device is immersed in an etching solution for 1.5 min, and then the molding device is uniformly lowered at a speed of 1 mm / s to obtain the molded ultra-thin glass;

[0106] (5) Chemical strengthening: one end of the non-molding region of the molded ultra-thin glass is immersed in a potassium nitrate solution for 20 min, then the other end of the non-molding region of the ultra-thin glass is immersed in the potassium nitrate solution for 15 min, and then the entire ultra-thin glass is immersed in the potassium nitrate solution for 10 min to obtain the CFG ultra-thin glass.

[0107] The thickness of the ultra-thin glass in step (1) is 70 μm; the acid-resistant film in steps (1) and (3) is a PP film with a thickness of 100 μm; and the concentration of the potassium nitrate solution in step (5) is 99.95%.

[0108] The plastic shaping device and the step of loading the ultra-thin glass into the plastic shaping device of the present example are the same as those of Example 1.

[0109] Comparative Example 1

[0110] The only difference between the present comparative example and Example 1 is that the plastic shaping device is lowered at a constant speed of 3 mm / s in step (2), and other conditions are the same as those of Example 1.

[0111] Comparative Example 2

[0112] The only difference between the present comparative example and Example 1 is that the ultra-thin glass is directly immersed in the potassium nitrate solution as a whole for 15 min in step (3), and other conditions are the same as those of Example 1.

[0113] The CFG ultra-thin glasses of Examples 1-4 and Comparative Examples 1-2 are subjected to performance tests, and the test methods are as follows:

[0114] (1) Resilience: The CFG ultra-thin glass is placed in a resilience test device, and the resilience value of the test glass at a set radius (R = 10 mm) is tested during the pressing process;

[0115] (2) 2PB (2 point bending) test: The CFG ultra-thin glass is placed in a bending machine, and the plastic shaping area is pressed until the glass is broken, and the bending radius data at the time of breakage is recorded;

[0116] (3) Bending radius: the radius value at the time of bending during the product bending test (200,000 times);

[0117] (4) Bending times: the plastic shaping area of the CFG ultra-thin glass is defined as the bending area, and the bending test is performed, and if the ultra-thin glass is not broken after 200,000 times of bending, the test is stopped;

[0118] (5) Anti-extrusion force: the CFG ultra-thin glass is placed in an extrusion device, and if the CFG ultra-thin glass can maintain 20 s without being broken under a certain set pressure, the set pressure is the anti-extrusion force.

[0119] The performance test results are shown in Table 1.

[0120] Table 1

[0121]

[0122] As can be seen from Table 1, the CFG ultra-thin glasses provided in Examples 1-4 all have excellent bending resistance and anti-extrusion force.

[0123] Compared with Example 1, the bending resistance and anti-extrusion force of the CFG ultra-thin glass provided in Comparative Example 1 are not much different, but the resilience is slightly increased.

[0124] Compared with Example 1, the extrusion resistance of the CFG ultra-thin glass B region provided by Comparative Example 2 slightly decreases.

[0125] The applicant declares that the CFG ultra-thin glass and the preparation method thereof of the present application are illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of the raw materials selected by the present application, addition of auxiliary ingredients, selection of specific modes, etc. all fall within the protection scope and disclosure scope of the present application.

Claims

1. A CFG ultra-thin glass, characterized in that, The CFG ultra-thin glass comprises a plastic zone and a non-plastic zone, the plastic zone comprises a flat zone and symmetrically distributed slope zones on both sides of the flat zone, and the slope zones are smoothly connected with the non-plastic zone and the flat zone; The width of the flat zone is 5mm-20mm. The width of the slope zone is 1mm-5mm. The CFG ultra-thin glass is prepared by the following method: (1) Film coating: an acid-resistant film is attached to one side of the ultra-thin glass; (2) Plastic forming: the ultra-thin glass of step (1) is loaded into a plastic forming device, then the plastic forming device is immersed in an etching solution for 1-2min, and then the plastic forming device is uniformly lowered or the etching solution is added to make the liquid level uniformly rise, to obtain the plastic-formed ultra-thin glass; (3) Chemical strengthening: one end of the non-plastic zone of the plastic-formed ultra-thin glass is immersed in a potassium nitrate solution, then the other end of the non-plastic zone of the ultra-thin glass is immersed in the potassium nitrate solution, and then the whole ultra-thin glass is immersed in the potassium nitrate solution, to obtain the CFG ultra-thin glass. 2.The CFG ultrathin glass of claim 1, wherein, The thickness of the non-plastic zone is 20μm-150μm. 3.The CFG ultrathin glass of claim 1, wherein, The depth of the flat zone is 10μm-100μm. 4.The CFG ultrathin glass of claim 1, wherein, The upper surface and / or the lower surface of the CFG ultra-thin glass is provided with a plastic zone. 5.The method of any one of claims 1-4, wherein, The preparation method comprises the following steps: (1) Film coating: an acid-resistant film is attached to one side of the ultra-thin glass; (2) Plastic forming: the ultra-thin glass of step (1) is loaded into a plastic forming device, then the plastic forming device is immersed in an etching solution for 1-2min, and then the plastic forming device is uniformly lowered or the etching solution is added to make the liquid level uniformly rise, to obtain the plastic-formed ultra-thin glass; (3) Chemical strengthening: one end of the non-plastic zone of the plastic-formed ultra-thin glass is immersed in a potassium nitrate solution, then the other end of the non-plastic zone of the ultra-thin glass is immersed in the potassium nitrate solution, and then the whole ultra-thin glass is immersed in the potassium nitrate solution, to obtain the CFG ultra-thin glass.

6. The production method according to claim 5, wherein The thickness of the ultra-thin glass of step (1) is 20μm-150μm.

7. The preparation method according to claim 5, characterized in that, The acid-resistant film of step (1) comprises any one of a PVC film, a PP film or a PET film.

8. The preparation method according to claim 5, characterized in that, The thickness of the acid-resistant film of step (1) is 50μm-300μm.

9. The preparation method according to claim 5, characterized in that, The speed of the uniform lowering of step (2) is 0.05-2mm / min.

10. The method of claim 5, wherein, The speed of the uniform rising of step (2) is 0.05-2mm / min.

11. The preparation method according to claim 5, characterized in that, The concentration of the potassium nitrate solution of step (3) is 95%-99.95%.

12. The method of claim 5, wherein, The time for immersing one end of the non-plastic zone of the plastic-formed ultra-thin glass in the potassium nitrate solution of step (3) is 10-30min.

13. The preparation method according to claim 5, characterized in that, The time for immersing the other end of the non-plastic zone of the ultra-thin glass in the potassium nitrate solution of step (3) is 10-30min.

14. The method of claim 5, wherein, The time for immersing the whole ultra-thin glass in the potassium nitrate solution of step (3) is 10-20min.

15. The preparation method according to claim 5, characterized in that, The molding device in step (2) comprises a molding block (001), a positioning block (002), a CFG fixing block (003), a side plate (004), and a connecting rod (005), wherein the molding block (001) is vertically fixed on the side plate (004), the positioning block (002) is located above the molding block (001) and is vertically fixed on the side plate (004), the CFG fixing block (003) is located outside the positioning block (002) and is connected with the positioning block (002), and one end of the connecting rod (005) is fixed in parallel with the side plate (004).

16. The method of claim 15, wherein, The molding block has an arc-shaped structure.

17. The preparation method according to claim 5, characterized in that, The step (2) of loading the ultrathin glass in step (1) into the molding device specifically comprises the following steps: The ultrathin glass is placed outside the molding block (001) and the positioning block (002), wherein the side with the acid-resistant film is in contact with the molding block and the positioning block, and then the CFG fixing block (003) is installed.

18. Application of the CFG ultrathin glass according to any one of claims 1-4 in a folding screen.

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