CN114315163A - Repair liquid, surface treatment method of ultrathin glass, ultrathin glass and display device - Google Patents

Repair liquid, surface treatment method of ultrathin glass, ultrathin glass and display device Download PDF

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CN114315163A
CN114315163A CN202111383847.9A CN202111383847A CN114315163A CN 114315163 A CN114315163 A CN 114315163A CN 202111383847 A CN202111383847 A CN 202111383847A CN 114315163 A CN114315163 A CN 114315163A
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glass
ultra
repair liquid
thin glass
acid
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欧阳春炜
尹爀俊
李汉培
杜川
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Saide Semiconductor Co ltd
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Saide Semiconductor Co ltd
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Abstract

The embodiment of the application discloses a repair liquid, a surface treatment method of ultrathin glass, the ultrathin glass and a display device. The repair liquid consists of the following components: 2-15% by weight of hydrofluoric acid; 0.3 to 4% by weight of ammonium fluoride; 2-15 wt% of inorganic acid and the balance of water. The repair liquid and the treatment method for the surface of the ultrathin glass can effectively passivate or remove the surface defects of the ultrathin glass, so that the damage effect of stress on the surface of the glass is reduced, and the strength of the glass is improved.

Description

Repair liquid, surface treatment method of ultrathin glass, ultrathin glass and display device
Technical Field
The application relates to the technical field of ultrathin glass processing, in particular to a repair liquid, a surface treatment method of ultrathin glass, the ultrathin glass and a display device.
Background
With the development of devices such as flexible screens and the like, ultra-thin glass comes to be produced, and mainly refers to glass with the thickness not exceeding 1.5 mm. The processing of ultra-thin glass presents a number of challenges due to its reduced thickness. For example, in the process of processing ultra-thin glass, it is difficult to avoid cutting the glass, and defects such as micro cracks, surface concave-convex marks, etc. are easily generated on the surface (for example, a cross section) of the glass, wherein the micro cracks induce stress concentration, which causes the glass to break in a controlled manner by pressure, tension or bending, and the yield is significantly reduced, and the surface concave-convex marks cause the glass to have strong roughness, and also easily cause breakage.
The traditional method often adopts a polishing mode to remove the defects. However, since the ultra-thin glass has a small thickness, it has poor resistance to polishing, and it is difficult to obtain a good removal effect on the one hand and easily causes breakage of the ultra-thin glass on the other hand.
Therefore, it is desirable to provide a treatment method that can effectively reduce the surface defects of ultra-thin glass to reduce chipping.
Disclosure of Invention
The invention aims to provide a repair liquid for repairing defects on the surface of ultrathin glass and a treatment method for the surface of ultrathin glass, so as to solve the problems.
In one aspect of the present application, a repair liquid is provided for repairing defects on an ultra-thin glass surface. According to the embodiment of the application, the repair liquid is composed of 2-15 wt% of hydrofluoric acid, 0.3-4 wt% of ammonium fluoride, 2-15 wt% of inorganic acid and the balance of water. Hydrofluoric acid in the repair liquid contains extremely strong electrophilic particles H+And medium electrophilic particles F-The glass has strong decomposition capability, and can react with oxides on the surface of the glass to form fluorosilicate which can be well dissolved in the repair liquid; the ammonium fluoride is alkaline and forms a buffer solution with hydrofluoric acid, so that the shape of the passivation part can be controlled and over-etching can be avoided by regulating and controlling the etching speed; the inorganic acid can provide H+So as to regulate and control the etching rate and exert a synergistic effect with hydrofluoric acid and/or ammonium fluoride to improve the repairing effect. Therefore, on one hand, the repairing liquid can corrode the end face of the microcrack and release the stress at the tip of the microcrack through chemical corrosion to sharply eliminate the stress, and on the other hand, the repairing liquid can effectively remove the microcrack layer on the surface of the ultrathin glass so as to remove the microcrack layerImproving the strength and breaking rate of the glass.
In another aspect of the present application, a method for surface treatment of ultra-thin glass is provided. According to an embodiment of the present application, a surface treatment method of ultra-thin glass includes: and contacting the surface of the ultrathin glass with at least the defects with the repair liquid, and etching the surface of the ultrathin glass with at least the defects. The surface or the section of the ultrathin glass forms defects such as microcracks and the like due to cutting, the repairing liquid can corrode the end faces of the microcracks, the stress at the tips of the microcracks is released and sharply eliminated through chemical corrosion, and the microcrack layer on the surface of the ultrathin glass can be effectively removed, so that the defects are repaired. According to the embodiment of the application, when the surface of the ultrathin glass at least with defects is etched, the temperature of the repairing liquid is 20-40 ℃, and preferably 25-30 ℃. According to the embodiment of the application, the etching time is 30 s-7 min, preferably 1-5 min. According to the embodiment of the application, before the contacting of the surface with defects of the ultrathin glass with the repair liquid, the method further comprises the following steps: wetting the ultra-thin glass with at least a defective surface.
In yet another aspect of the present application, an ultra-thin glass is provided. According to the embodiment of the application, the ultrathin glass is obtained after being processed by the surface treatment method of the ultrathin glass, is provided with the passivation part with the passivation size of 5-25 mu m, and can bear the bending radius of less than 3mm, so that the ultrathin glass has good strength and bending resistance.
In yet another aspect of the present application, a display device is provided. According to an embodiment of the present application, the display device includes the ultra-thin glass as described above. Therefore, the display device has better strength and comprises flexibility or folding performance.
The repair liquid and the treatment method for the surface of the ultrathin glass can effectively passivate or remove the surface defects of the ultrathin glass, so that the damage effect of stress on the surface of the glass is reduced, and the strength of the glass is improved;
the application provides an ultra-thin glass, intensity is high, anti bending capability is outstanding, is applicable to flexible screen of preparation and relevant equipment.
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Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 shows a passivation structure;
FIG. 2 is a schematic illustration of the circularity of the passivation;
FIG. 3 is a schematic view of the bend radius of ultra-thin glass;
FIG. 4 is a graph of passivation size versus bend radius;
FIG. 5 is a graph of circularity versus bend radius.
Detailed Description
The present application will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It is noted that the endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and that such ranges or values are understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Cover substrates, such as cover glasses, for consumer products (e.g., consumer electronics, including cell phones, tablets, computers, navigation systems, wearable devices, etc.) are primarily used to provide a transparent surface that is easy to clean and to protect sensitive components of the consumer product from mechanical damage (e.g., punctures and impact forces). For consumer products that include flexible, foldable, and/or sharply curved portions (e.g., including flexible, foldable, and/or sharply curved display screens), the cover glass used to protect the display screen should retain the flexibility, foldability, and/or curvature of the display screen.
The flexibility of ultra-thin glass makes the above-described styling of consumer products possible. However, ultra-thin glass is prone to visible defects, such as mechanical defects, during processing. The mechanical defect may be a crack or a plastic deformation (e.g., a surface indentation). The crack may be a surface crack or a through crack, and may extend through all or a portion of the layers of the glass.
As an example of defects that may easily occur in the process of processing the ultra-thin glass, it is difficult to inevitably cut a large-sized glass into a small size to meet the application target, for example, microcracks may be easily formed on the surface of the glass when cutting is performed by a physical or mechanical method such as laser, diamond wheel, CNC, and the like. In particular, due to restrictions of the cutting apparatus and the cutting method, microcracks are liable to occur at a position close to the cutting, i.e., a cut edge or a cut section of glass. Stress concentrations are induced at the tips of the microcracks in the tensile stress region, and when the stress is above a certain threshold, the crack tip radius is reduced by stress corrosion and crack growth occurs, causing the glass to fracture at stresses well below theoretical strength. The traditional defect repairing method, such as grinding and polishing, cannot completely remove sharp crack tips, so that the repairing effect is poor, and how to remove the surface micro-crack layer to the maximum extent is very important for improving the glass strength.
Thus, in a first aspect of the present application, the present application provides a repair liquid, which is composed of 2 to 15 wt% of hydrofluoric acid, 0.3 to 4 wt% of ammonium fluoride, 2 to 15 wt% of an inorganic acid, and the balance of water.
The repair liquid can corrode the end face of the microcrack, release stress at the tip of the microcrack through chemical corrosion, sharply eliminate the stress, and effectively remove the microcrack layer on the surface, so that the fracture rate of the glass is improved. As shown in fig. 1, the corroded crack tip is blunted to form a passivation (Blunt) to reduce stress concentration, the formed passivation is circular or elliptical, and the passivation Size (Blunt Size) of the passivation can be adjusted by adjusting the composition of the repair liquid, the repair time and the repair temperature. It has been surprisingly found that when a passivating portion of a particular passivating size and shape is formed on the surface of the glass using the repair liquid of the present application, the dynamic bending properties of the glass are significantly improved, in particular as evidenced by a significant increase in the bending radius that can withstand fracture, i.e., increased bending strength is obtained.
The materials in the repair liquid of the present example are combined with each other to form an appropriate acid-base environment. Wherein the hydrofluoric acid contains extremely strong electrophilic particles H+And medium electrophilic particles F-The glass repair liquid has strong decomposition capability, can react with oxides on the surface of glass to form fluorosilicate, and the fluorosilicate can be well dissolved in the repair liquid. According to the embodiment of the application, through optimization screening, based on the total weight of the repair liquid, the content of hydrofluoric acid is 2-15%, when the amount of hydrofluoric acid is less than 2%, a passivation part is difficult to form, so that the bending strength of glass cannot be increased, and when the amount of hydrofluoric acid is more than 15%, on one hand, the etching amount is too large, the size of glass is affected, and the morphology of the passivation part is not uniform, on the other hand, the etching rate is too high, so that the formation degree of the passivation part is difficult to control, and safety and environmental problems may be caused. Ammonium fluoride is basic and forms a buffer solution with hydrofluoric acid, and NH4+Will influence F-The activation degree of the passivation part is adjusted and controlled to reduce the reaction rate of the glass and hydrofluoric acid, the shape of the passivation part is controlled and over-etching is avoided through the adjustment and control of the etching speed, the slow etching speed is favorable for improving the flatness of the edge, and the glass strength is favorably improved. According to the embodiment of the application, through optimization screening, based on the total weight of the repair liquid, the content of ammonium fluoride is 0.3-4%, when the amount of ammonium fluoride is less than 0.3%, the purpose of controlling the etching rate is difficult to achieve, and when the amount of ammonium fluoride is more than 4%, the etching rate is too low, so that the repair efficiency is affected. The inorganic acid can provide H+To regulate the etching rate and to act synergistically with hydrofluoric acid and/or ammonium fluoride to provideHigh repairing effect. According to the embodiment of the application, by optimizing and screening, based on the total weight of the repair liquid, the content of inorganic acid is 2-15%, the content of inorganic acid is less than 2%, the etching rate is reduced, an expected passivation part cannot be formed, the content of inorganic acid is greater than 15%, on one hand, the etching rate is too high, so that the shape and the size of the passivation part are not controlled, on the other hand, the inorganic acid in the repair liquid reaches a critical saturation state when the content of the inorganic acid is 15%, if the content of the inorganic acid is continuously increased, the repair liquid contains excessive inorganic acid, the cost is increased, and more acid-containing wastewater is discharged. Among them, the water is preferably deionized water.
The repair liquid is configured to form a passivation part with a passivation size of 5-25 μm on the glass surface, preferably form a passivation part with a passivation size of more than 9 μm to improve the anti-crushing performance, and further preferably form a passivation part with a passivation size of more than 10 μm. Wherein, the shape of the passivation part is preferably circular or elliptical to make the stress distribution uniform, and the passivation part has a circularity of 1-5. As shown in fig. 2, the ratio of the major axis diameter (y) to the minor axis diameter (x) of the formed round or oval passivation is defined as the circularity. The adjustment of the passivation size and the circularity of the passivation part can be realized by adjusting the composition of the repair liquid, the repair time and the repair temperature, and the circularity of the passivation part is preferably 1 so as to form uniformly distributed stress.
At the same time, the repair liquid is configured to increase the bending strength or breaking strength, for example, so that the treated glass can withstand a bending radius of 3mm or less. As shown in fig. 3, when a bending force 11 is applied to the glass 10 to bend it to a bending radius R, the limit R value at which the glass does not break when held at the "R" radius for more than 60 minutes at about 25 ℃ and about 50% relative humidity is 3mm or less. In some embodiments, the bend radius R of the treated glass can be 2.5mm or less. In some embodiments, the bend radius R of the treated glass can be 2mm or less. In some embodiments, the bend radius R of the treated glass can be 1.5mm or less.
In some embodiments, the hydrofluoric acid is present in an amount of 5 to 10 wt%. The repair liquid with the content is proved to have better repair effect.
In some embodiments, the ammonium fluoride is present in an amount of 0.7 to 1.5 wt.%. The repair liquid with the content is proved to have better repair effect.
In some embodiments, the inorganic acid is present in an amount of 7 to 12 wt.%. The repair liquid with the content is proved to have better repair effect.
In some embodiments, the repair liquid comprises 9 wt% hydrofluoric acid, 1.2 wt% ammonium fluoride, 12 wt% inorganic acid, and the balance water. By optimizing the content of the three key components, the glass treated by the repair liquid of the embodiment forms a remarkably optimized passivation part and bending strength.
In some of these embodiments, the inorganic acid is at least one of nitric acid, sulfuric acid, phosphoric acid, and hydrochloric acid. Nitric acid can increase acidity of the acid solution and enhance etching effect; the viscosity of the sulfuric acid is high, so that the surface of the glass can be covered and protected, and new defects are prevented from being generated in the etching process; the addition of phosphoric acid can ensure the SiO of the glass2The layer is not over-etched but only in-plane defects are repaired; the hydrochloric acid can effectively remove metal impurities contained in the glass, and the dissolved glass components can not be condensed to form a water glass state.
In some embodiments, the inorganic acid is a combination of sulfuric acid and phosphoric acid, and the mass ratio of sulfuric acid to phosphoric acid is 1: 1-3. The inventor of the application unexpectedly finds that when the combination of sulfuric acid and phosphoric acid is adopted, and the mass ratio of the sulfuric acid to the phosphoric acid is 1: 1-3, such as 1:1, 1:2 and 1:3, the repair liquid has better repair effect than other inorganic acids or the combination of the inorganic acids. Probably because the hydrogen bonds of the sulfuric acid and the phosphoric acid are strong and have higher boiling points and viscosity, on one hand, the etching can be promoted by increasing the boiling point of the repair liquid, and on the other hand, the glass surface can be covered and protected, so that new defects are avoided. When only NO is stored in the repair liquid3 -And Cl-In the presence of sulfuric acid and phosphoric acid, the viscosity and/or boiling point of the repair liquid are not improved to a desired degree, resulting in unsatisfactory repairAnd (4) horizontal.
The repairing liquid is prepared by mixing the raw materials according to the formula amount and uniformly stirring. The repair liquid has a reasonable formula, the purposes of controlling the etching degree, the etching uniformity and the etching rate are achieved by controlling the using amount of each component, and the surface microcracks of the ultrathin glass treated by the repair liquid are obviously passivated.
In a second aspect of the present application, there is provided a method for surface treatment of ultra-thin glass, comprising the steps of: and contacting the surface of the ultrathin glass with at least the defects with the repair liquid, and etching the surface of the ultrathin glass with at least the defects.
For example, the surface to be treated of the ultrathin glass is immersed in the repair liquid, or the repair liquid is sprayed on the surface to be treated, or the surface to be treated of the ultrathin glass, which does not need to be treated, can be covered and protected to expose the surface to be treated, and then the ultrathin glass is immersed in the repair liquid or sprayed with the repair liquid.
In some embodiments, the temperature of the repair liquid is 20-40 ℃ when the surface of the ultra-thin glass with at least defects is etched. Too high a temperature results in an excessively large etching amount and non-uniform passivation state, on the one hand, and side reactions, on the other hand, and too low a temperature results in a slow etching rate. According to the embodiment of the application, the repairing effect is better when the temperature of the repairing liquid is 25-30 ℃ through optimization screening.
In some embodiments, the etching time is 30 s-7 min, preferably 1-5 min, and more preferably 3 min. Etching time affects etching degree and etching uniformity, the etching time is too short to repair defects, the circularity of a passivation portion is poor, and overetching is easily caused by too long time.
In some embodiments, before contacting the ultra-thin glass with the repair liquid, the ultra-thin glass further comprises: wetting the ultra-thin glass with at least a defective surface.
Wherein, the surface of the ultra-thin glass with at least defects can be wetted by immersing the surface in water (such as deionized water) for 5-30 min, and the purpose of wetting the surface is to fully wet cracks or micropores, thereby improving the corrosion speed and the corrosion uniformity.
In some embodiments, after contacting the surface of the ultra-thin glass having defects with the repair liquid, cleaning the treated surface. The cleaning step and the reagents used in the cleaning step can be those commonly used in the art, for example, the cleaning reagent is pure water or an alkaline glass cleaner, and the cleaning method is multi-tank soaking, showering, etc.
In a third aspect of the present application, there is provided an ultra-thin glass obtained by treating the ultra-thin glass with the surface treatment method described above.
In one embodiment, the ultra-thin glass has a passivation portion having a passivation size of 5 to 25 μm. In one embodiment, the passivation is a circle or an ellipse having a ratio of a major axis diameter to a minor axis diameter of 1 to 5. In one embodiment thereof, the ultra-thin glass withstands bending radii of 3mm or less. In one embodiment thereof, the ultra-thin glass has a passivation dimension greater than 10 μm and withstands bend radii of 1.5mm or less. The ultra-thin glass is formed with a passivation of a specific passivation size and shape to allow stress relief at the crack tip and sharp elimination, thereby increasing strength, and its dynamic bending characteristics are significantly improved, in particular as a bending radius that can withstand fracture is significantly increased, i.e., increased bending strength is obtained.
In a fourth aspect of the present application, there is provided a display device comprising the ultra-thin glass of the present application. One exemplary article comprising a display device disclosed herein is a consumer electronic device comprising a housing having a front surface, a back surface, and side surfaces; electrical components located at least partially or completely within the housing and which include at least a controller, a memory and a display device located at or near the front surface of the housing. The display device has all the features and advantages of the ultra-thin glass described above, and will not be described in any greater detail herein.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Examples 1 to 6 and comparative examples 1 to 7
The method comprises the following steps of preparing a repairing liquid according to the components in percentage by weight shown in the following table, and treating the surface of the glass by using the repairing liquid, wherein the specific process for treating the ultrathin glass comprises the following steps: 1) forming a protective layer on a surface mask of the ultrathin glass without defects, wherein the ultrathin glass is alkali aluminosilicate glass and has the thickness of 1 mm; 2) soaking ultrathin glass in pure water for 20min, and soaking in repairing solution at 23 deg.C for 3 min; 3) fully cleaning the treated glass by adopting pure water; 4) strengthening for 40min at 370 ℃ by using a conventional chemical strengthening agent in the field; 5) the passivation size of the passivation was measured by observing the passivation through SEM, and the bending radius was measured by two-point bending.
Figure BDA0003364928080000101
Figure BDA0003364928080000111
As is clear from comparison of comparative examples 1 to 7 with examples 1 to 6, when only the repair liquid containing hydrofluoric acid, or hydrofluoric acid and ammonium fluoride, or hydrofluoric acid and an inorganic acid was used, although the passivation portion could be formed, the passivation size was 5 μm or less and the bend radius was 3mm or more, indicating that the repair effect on the surface defects of the glass was poor and the breaking strength of the glass was not as expected.
From the results of examples 1 to 6, it was found that when the content of hydrofluoric acid was 9 wt%, the content of ammonium fluoride was 0.7 to 1.5 wt%, and the content of inorganic acid was 7 to 12 wt%, the glass treated with the repair liquid was able to form a passivated portion having a passivated portion with a passivated size of more than 9 μm, and the glass had a bending radius (R) of 1.5mm or less.
It can be seen from example 6 that the repairing effect is more excellent when the hydrofluoric acid content is 9 wt%, the ammonium fluoride content is 1.2 wt%, and the inorganic acid content is 12 wt%, the treated glass can form a passivated portion having a passivated size of more than 12 μm, and the glass has a bending radius (R) of 1.1 mm.
It is found from examples 1 to 6 and comparative examples 8 to 9 that when the inorganic acid content exceeds 15 wt%, for example, 22 wt% and 30 wt%, the obtained repair liquid can obtain a slightly deteriorated repair effect compared with the inorganic acid content of 12 wt%, which indicates that the inorganic acid content in the repair liquid reaches a saturated range, and although the increase of the inorganic acid content does not significantly deteriorate the repair effect of the repair liquid, the repair liquid can contain excessive inorganic acid, so that the repair effect can be ensured by controlling the inorganic acid content to be below 15%, the cost can be reduced, and environmental and health problems caused by excessive acid content in the repair liquid can be avoided.
As described above, in order to ensure a preferable repairing effect, the content of hydrofluoric acid is preferably 2 to 15 wt%, more preferably 5 to 10 wt%, and even more preferably 9 wt%, and the content of ammonium fluoride is preferably 0.3 to 4 wt%, more preferably 0.7 to 1.5 wt%, and even more preferably 1.2 wt%, and the content of inorganic acid is preferably 2 to 15 wt%, more preferably 7 to 12 wt%, and even more preferably 12 wt%.
The change rule of the passivation size and the bending radius is shown in fig. 4, and it can be seen that the ultrathin glass treated by the repair liquid of the embodiment of the application can have a passivation part with a passivation size larger than 9 μm and can withstand a bending radius smaller than 1.5 mm.
Further, the inventors of the present application studied the influence of the treatment time on the morphology of the passivated portion, and calculated the circularity of the passivated portion at different treatment times, and the composition of the repair liquid and the experimental results are shown in the following table, and the change law of the repair time and the circularity is shown in fig. 5.
Figure BDA0003364928080000121
It can be seen that the circularity of the passivated portion is related to the composition of the repair liquid and the treatment time, and when the treatment time is 3min, the circularity can be made to approach 1, indicating that the morphology of the passivated portion formed at the treatment time is more uniform and approaches a circular shape.
Further, the inventors of the present application, taking the repairing solution of example 1 as an example, studied the treatment effect of the repairing solution at different temperatures, and found that the contact time of the treated surface and the repairing solution is 3min, and as a result of experiments, when the treatment temperature is 20 to 40 ℃, especially 25 to 30 ℃, the treated ultra-thin glass can form a passivation part with a passivation size of more than 9 μm, the bending radius R is 1.5mm or less, and the circularity is close to 1, which indicates that a passivation part with a uniform shape can be formed in the preferable temperature range, so that the strength of the ultra-thin glass is remarkably enhanced.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that modifications, substitutions, and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (17)

1. The repair liquid is used for repairing the defects of the surface of the ultrathin glass and is characterized by comprising the following components:
2-15% by weight of hydrofluoric acid;
0.3 to 4% by weight of ammonium fluoride;
2-15 wt% of an inorganic acid; and
the balance of water.
2. The repair liquid according to claim 1, wherein the hydrofluoric acid content is 5 to 10% by weight.
3. The repair liquid according to claim 1, wherein the ammonium fluoride is contained in an amount of 0.7 to 1.5% by weight.
4. The repair liquid according to claim 1, wherein the inorganic acid is contained in an amount of 7 to 12% by weight.
5. The repair fluid according to claim 1, consisting of:
9% by weight of hydrofluoric acid;
1.2% by weight of ammonium fluoride;
12% by weight of an inorganic acid; and
the balance of water.
6. The repair liquid according to any one of claims 1 to 5, wherein the inorganic acid is at least one of nitric acid, sulfuric acid, phosphoric acid, and hydrochloric acid.
7. The repair liquid according to claim 6, wherein the inorganic acid is a combination of nitric acid and sulfuric acid, and the mass ratio of the sulfuric acid to the phosphoric acid is 1: 1-3.
8. A surface treatment method of ultrathin glass is characterized by comprising the following steps:
contacting at least the surface with defects of the ultrathin glass with the repair liquid as claimed in any one of claims 1 to 7, and etching the surface with at least defects of the ultrathin glass.
9. The method for surface treatment of an ultra-thin glass as claimed in claim 8, wherein the temperature of the repair liquid is 20 to 40 ℃ when etching at least a surface of the ultra-thin glass having defects.
10. The method for surface treatment of ultra-thin glass as claimed in claim 8, wherein the etching time is 30s to 7 min.
11. The method for surface treatment of an ultra-thin glass as claimed in claim 8, further comprising, before contacting at least a surface of the ultra-thin glass having defects with the repair liquid:
wetting the ultra-thin glass with at least a defective surface.
12. An ultrathin glass characterized by being obtained by being treated by the surface treatment method for an ultrathin glass according to any one of claims 8 to 11.
13. The ultra-thin glass of claim 12, having a passivation dimension of 5 to 25 μ ι η.
14. The ultra-thin glass of claim 13, wherein the passivation portion is circular or elliptical in shape having a ratio of a major axis diameter to a minor axis diameter of 1 to 5.
15. The ultra-thin glass of claim 12, wherein the ultra-thin glass withstands a bend radius of 3mm or less.
16. The ultra-thin glass of claim 12, having a passivation dimension greater than 9 μ ι η and withstanding a bend radius of 1.5mm or less.
17. A display device comprising the ultra-thin glass as defined in any one of claims 12 to 16.
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