阅读说明：本技术 曲面强化玻璃及其制备方法 (Curved surface strengthened glass and preparation method thereof ) 是由 锺志明 廖峻伟 林幸樵 于 2018-06-21 设计创作，主要内容包括：本发明涉及一种曲面强化玻璃及其制备方法。曲面强化玻璃的制备方法包括：提供具有缓冲层的平面玻璃基材；以及将平面玻璃基材进行化学强化处理而进行离子交换,通过缓冲层的遮挡,使得所述平面玻璃基材表面的离子交换深度不同,让平面玻璃基材在缓冲层的位置形成弯折部,以得到曲面强化玻璃。另外,本发明还提供一种曲面强化玻璃。本发明的曲面强化玻璃的制备方法能简化生产制造过程以及降低成本与产品不良率。(The invention relates to curved surface tempered glass and a preparation method thereof. The preparation method of the curved surface strengthened glass comprises the following steps: providing a planar glass substrate having a buffer layer; and chemically strengthening the planar glass substrate to perform ion exchange, wherein the ion exchange depth of the surface of the planar glass substrate is different through the shielding of the buffer layer, and the planar glass substrate forms a bent part at the position of the buffer layer to obtain the curved surface strengthened glass. In addition, the invention also provides curved surface tempered glass. The preparation method of the curved surface strengthened glass can simplify the production and manufacturing process and reduce the cost and the product reject ratio.)

1. The preparation method of the curved surface tempered glass is characterized by comprising the following steps of:

providing a planar glass substrate comprising a buffer layer; and

carrying out chemical strengthening treatment on the planar glass substrate, and carrying out ion exchange on the planar glass substrate through the chemical strengthening treatment to obtain curved surface strengthened glass;

the ion exchange depth of the surface of the planar glass substrate is different through the shielding of the buffer layer during the chemical strengthening treatment of the planar glass substrate, so that a bent part is formed on the planar glass substrate at the position of the buffer layer.

2. The method according to claim 1, wherein the planar glass substrate comprises an optical film layer formed on a surface of the planar glass substrate, and the buffer layer is formed on the surface of the planar glass substrate.

3. The method according to claim 1, wherein the planar glass substrate comprises at least one buffer region, wherein the at least one buffer region is located on a surface of the planar glass substrate near the long side, and wherein the buffer layer is formed on the at least one buffer region such that a surface of the planar glass substrate covered by the at least one buffer layer has a different ion exchange depth than other surfaces of the planar glass substrate not covered by the at least one buffer layer.

4. The method according to claim 3, wherein the flat glass substrate comprises another buffer region, two buffer regions are respectively located on the surfaces of two corresponding long sides of the flat glass substrate, and the buffer layers are formed on the two buffer regions, so that the ion exchange depth of the surface of the flat glass substrate covered by the two buffer layers is different from the ion exchange depth of the other surfaces of the flat glass substrate not covered by the two buffer layers.

5. The method according to claim 1, wherein the planar glass substrate comprises a plurality of buffer regions, each of the buffer regions is located on a surface of each of two corresponding long sides of the planar glass substrate, and the buffer layers are formed on each of the buffer regions, so that the surface of the planar glass substrate covered by each of the buffer layers has a different ion exchange depth from the remaining surfaces of the planar glass substrate not covered by each of the buffer layers.

6. The method according to claim 1, wherein the buffer layer is made of an inorganic compound or an organic compound.

7. The method of claim 1, wherein the buffer layer is selected from the group consisting of silicon dioxide, silicon nitride, indium tin oxide, titanium oxide, niobium oxide, and combinations thereof.

8. The method of claim 1, wherein the buffer layer is a coating or a paint layer.

9. The method of claim 1, wherein the buffer layer has a thickness in a range from 1 nm to 100 μm.

10. The method for producing a curved tempered glass according to claim 1, wherein in the step of subjecting the flat glass substrate to the chemical tempering treatment, the flat glass substrate is immersed in a molten chemical tempering salt to be subjected to the chemical tempering treatment.

11. The method for producing the curved tempered glass according to claim 10, wherein the molten chemical strengthening salt is a molten potassium nitrate salt or a molten sodium nitrate salt.

12. The method of claim 1, wherein the ion exchange depth is between 5 microns and 150 microns and includes 5 microns and 150 microns.

13. The curved surface strengthened glass is characterized by comprising at least one bending part and at least one buffer layer, wherein the buffer layer is formed on the surface of the bending part, and the ion exchange depth of the surface of the curved surface strengthened glass, which is shielded by at least one buffer layer, is different from the ion exchange depth of the other surfaces which are not shielded by at least one buffer layer.

14. The curved strengthened glass of claim 13, further comprising: and the two bending parts are oppositely formed on two opposite long edges of the curved surface tempered glass.

15. The curved strengthened glass of claim 13, wherein the ion exchange depth is between 5 microns and 150 microns and includes 5 microns and 150 microns.

Technical Field

The invention relates to a glass forming method, in particular to curved surface strengthened glass and a preparation method thereof.

Background

In recent years, the display panel of the electronic device is gradually changed from a flat panel to a curved panel, and thus the demand for curved glass for the curved panel is increasing.

In the prior art, a mold pressing method is generally used, a heated glass plate is placed on a forming mold with an inner concave shape, and then pressure is applied to form the glass plate according to the forming mold.

Another prior art method for generating curved surfaces is a suction molding method, in which a molding die of the suction molding method has an upper die, a lower die and a core therebetween; the mould core is provided with a plurality of holes which are communicated with the diversion trench opened on the lower mould, the mould core is pumped through the diversion trench of the lower mould, and then the glass plate blank which is poured into the mould core and can be in a glass plastic state is deformed and bent towards the mould core, and then the curved glass is obtained after cooling and demoulding.

In addition, chemical strengthening is generally used for strengthening treatment of glass. Chemical strengthening is a technique of using monovalent cations (such as potassium ions) to replace alkali metal ions (such as sodium ions) contained in the surface of glass, thereby forming a compressive stress layer on the surface of the glass and further improving the strength of the glass.

However, the above prior art is limited by the size of the forming mold, and the surface roughness of the curved glass is also easily increased when the forming mold contacts with the forming mold. Moreover, when the strengthened glass with the curved surface is to be manufactured, the hardness of the strengthened glass is stronger, so that the difficulty of manufacturing the curved surface in a pressurizing way is increased; or the curved glass is deformed and bent again when the curved glass is subjected to chemical strengthening; therefore, the manufacturing process is complicated, the yield is low and the cost is high.

Disclosure of Invention

In view of the disadvantages of the prior art, an object of the present invention is to provide a method for manufacturing curved tempered glass, which can simplify the manufacturing process and reduce the cost and product fraction defective, and curved tempered glass manufactured by the method.

In order to achieve the above object, the present invention provides a method for preparing curved surface strengthened glass, comprising: providing a planar glass substrate comprising a buffer layer; carrying out chemical strengthening treatment on the planar glass substrate, wherein the planar glass substrate is subjected to ion exchange through the chemical strengthening treatment to obtain curved surface strengthened glass; the ion exchange depth of the surface of the planar glass substrate is different through the shielding of the buffer layer during the chemical strengthening treatment of the planar glass substrate, so that a bent part is formed on the planar glass substrate at the position of the buffer layer.

Preferably, the planar glass substrate comprises an optical film layer, the optical film layer is formed on the surface of the planar glass substrate, and the buffer layer is formed on the surface of the planar glass substrate.

Preferably, the planar glass substrate comprises at least one buffer region, the at least one buffer region is located on the surface of the planar glass substrate close to the long side, and the buffer layer is formed on the at least one buffer region, so that the ion exchange depth of the surface of the planar glass substrate shielded by the at least one buffer layer is different from the ion exchange depth of the other surfaces not shielded by the at least one buffer layer.

More preferably, the planar glass substrate includes another buffer region, two buffer regions are respectively located on the surfaces of two corresponding long sides of the planar glass substrate, and the buffer layers are formed on the two buffer regions, so that the ion exchange depth of the surface of the planar glass substrate shielded by the two buffer layers is different from the ion exchange depth of the other surfaces not shielded by the two buffer layers.

Preferably, the planar glass substrate includes a plurality of buffer regions, each of the buffer regions is located at a position where a bending portion is expected to be formed on a surface of the planar glass substrate, and the buffer layer is formed on each of the buffer regions, so that a surface of the planar glass substrate covered by each of the buffer layers has a different ion exchange depth from other surfaces of the planar glass substrate not covered by each of the buffer layers.

Preferably, the buffer layer has a thickness ranging from 1 nm to 100 μm.

Preferably, the material of the buffer layer is an inorganic compound or an organic compound.

More preferably, the buffer layer is made of a material selected from the group consisting of silicon dioxide, silicon nitride, indium tin oxide, titanium oxide, niobium oxide, and combinations thereof.

Preferably, the buffer layer is a coating layer or a paint layer.

Preferably, in the step of subjecting the flat glass substrate to chemical strengthening treatment, the flat glass substrate is immersed in a molten chemical strengthening salt to be subjected to chemical strengthening treatment.

More preferably, the molten salt of chemical strengthening includes, but is not limited to, a molten salt of potassium nitrate or a molten salt of sodium nitrate.

Preferably, the ion exchange depth is between 5 microns to 150 microns and includes 5 microns and 150 microns.

In order to solve the above technical problem, another technical solution of the present invention is to provide a curved tempered glass, which includes at least one bending portion and at least one buffer layer, wherein the buffer layer is formed on a surface of the bending portion, and an ion exchange depth of a surface of the curved tempered glass, which is shielded by the at least one buffer layer, is different from an ion exchange depth of other surfaces of the curved tempered glass, which are not shielded by the at least one buffer layer.

Preferably, the curved tempered glass further comprises: and the two bending parts are oppositely formed on two opposite long edges of the curved surface tempered glass.

Preferably, the ion exchange depth is between 5 microns to 150 microns and includes 5 microns and 150 microns.

The preparation method of the curved surface strengthened glass has the beneficial effects that the technical scheme that the ion exchange depths of the surfaces of the plane glass substrates are different through the shielding of the buffer layer is adopted, so that the plane glass substrates are bent at the position of the buffer layer and become the curved surface strengthened glass, and the manufacturing process steps in the prior art can be simplified to obtain the curved surface strengthened glass. The preparation method of the invention not only simplifies the steps of the manufacturing process, but also reduces the manufacturing cost and the reject ratio of the product; in addition, the preparation method of the invention is different from the prior art which needs a forming die to manufacture, so the preparation method is not limited by the size of glass, and the preparation method is more widely applied.

The invention has another beneficial effect that the curved surface tempered glass prepared by the preparation method can be applied to the panels of electronic devices and the protective casings of electronic carrying devices.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.

Drawings

FIG. 1 is a flow chart of a method for manufacturing a curved tempered glass according to a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a planar glass substrate according to a first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional side view of a planar glass substrate according to a first embodiment of the present invention.

Fig. 4 is a schematic view of S200 in the method for manufacturing a curved tempered glass according to the first embodiment of the present invention.

Fig. 5 is another schematic view of S200 of the method for manufacturing a curved tempered glass according to the first embodiment of the present invention.

FIG. 6 is a perspective view of a curved tempered glass according to a first embodiment of the present invention.

FIG. 7 is a schematic cross-sectional side view of a curved tempered glass according to a first embodiment of the invention.

FIG. 8 is a schematic cross-sectional side view of a planar glass substrate according to a second embodiment of the present invention.

FIG. 9 is a schematic cross-sectional side view of the surface-treated strengthened glass obtained by the manufacturing method of the present invention on the flat glass substrate shown in FIG. 8.

FIG. 10 is a schematic cross-sectional side view of another aspect of a planar glass substrate according to a second embodiment of the present invention.

FIG. 11 is a schematic sectional side view of the surface-treated strengthened glass obtained by the manufacturing method of the present invention on the flat glass substrate shown in FIG. 10.

Detailed Description

The following is a description of the embodiments of the "curved tempered glass and the method for making the same" disclosed in the present invention with reference to specific examples, and those skilled in the art will understand the advantages and effects of the present invention from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.

[ first embodiment ]

Referring to fig. 1, a first embodiment of the present invention provides a method for producing curved tempered glass. As shown in fig. 2 and fig. 3, step S100 is first performed to provide a planar glass substrate 1, where the planar glass substrate 1 includes a buffer layer 2. The flat glass substrate 1 is made of glass for ion strengthening, the material of the flat glass substrate 1 is prepared by general glass raw materials such as silica, alumina, potassium carbonate, calcium carbonate, basic magnesium carbonate or sodium carbonate, and the like, in the embodiment, the flat glass substrate 1 is glass for strengthening containing sodium ions, the buffer layer 2 is a coating layer or a coating layer, and the material of the buffer layer 2 can be an inorganic compound or an organic compound with good adhesion with glass. For example, the material of the buffer layer 2 is preferably selected from the group consisting of silicon dioxide, silicon nitride, indium tin oxide, titanium oxide, niobium oxide, and combinations thereof. In addition, in the present embodiment, the planar glass substrate 1 is provided with at least one buffer area 11 and another buffer area 11, and the two buffer areas 11 are respectively located on the surfaces of two corresponding long sides of the planar glass substrate 1; wherein the buffer layer 2 is formed on each of the buffer regions 11. For example, the thickness of the buffer layer 2 ranges from 1 nm to 100 μm, and can be adjusted according to the radius of curvature of the final product. However, the present invention is not limited to the above-mentioned examples.

For example, the planar glass substrate 1 may be provided with a plurality of buffer regions 11, and each buffer region 11 is located at a position where a surface of the planar glass substrate 1 is expected to bend.

The flat glass substrate 1 may be first preheated to a suitable temperature, and then, as shown in fig. 4, the flat glass substrate 1 is chemically strengthened in step S200.

In the present embodiment, the flat glass substrate 1 is immersed in the molten chemical strengthening salt 6 at a specific temperature of 350 ℃ to 480 ℃ (preferably 410 ℃) for 5 minutes to 600 minutes (preferably about 90 minutes to 410 minutes). In the present example, the molten chemical strengthening salt 6 is a molten potassium nitrate salt, and potassium ions in the molten potassium nitrate salt are ion-exchanged with sodium ions in the flat glass substrate 1, thereby forming a compressive stress layer on the surface of the flat glass substrate 1. Since the ion exchange depth of the planar glass substrate 1 is shallow because the buffer layer 2 covers the buffer region 11, the compressive stress layer formed in the buffer region 11 is thinner than the other surfaces, and is thus stressed and bent. Wherein the ion exchange depth is between 5 microns and 150 microns and includes 5 microns and 150 microns. Referring to fig. 4 and 5, after the chemical strengthening treatment, the planar substrate 1 (as shown in fig. 4) becomes a curved strengthened glass 3 (as shown in fig. 5) including at least one bent portion 31, and in this embodiment, further includes another bent portion 31 formed on two opposite long sides of the curved strengthened glass 3; the buffer layer 2 is on the surface of the bending portion 31, as shown in fig. 6 and 7. The curved tempered glass 3 after the chemical tempering treatment is further subjected to the steps of washing and slow cooling.

It is to be noted that the flat glass substrate may be a glass for tempering containing lithium ions, the molten chemical tempering salt may be a molten potassium nitrate salt or a molten sodium nitrate salt, and lithium ions in the flat glass substrate are ion-exchanged with potassium ions in the molten potassium nitrate salt or sodium ions in the molten sodium nitrate salt, thereby forming a compressive stress layer on the surface of the flat glass substrate. However, the present invention is not limited to the above-mentioned examples.

In the present invention, the thickness of the buffer layer 2 affects the ion exchange rate and further affects the curvature radius of the bent portion 31 of the curved tempered glass 3 to be finally formed. In other words, the thicker the buffer layer 2 is, the smaller the radius of curvature of the bent portion 31 is; the thinner the buffer layer 2 is, the larger the radius of curvature of the bent portion 31 is.

[ second embodiment ]

The second embodiment of the present invention is similar to the first embodiment of the present invention, and the difference is that the planar glass substrate 1 of the second embodiment further includes an optical film layer 4, and the optical film 4 is formed on at least one surface of the planar glass substrate 1. Thus, for example, one aspect of the flat glass substrate 1 of the second embodiment is shown in fig. 8, i.e., the optical film 4 is formed between the flat glass 1 and the buffer layer 2, and the curved tempered glass 3 is shown in fig. 9; in another aspect, as shown in fig. 10, the optical film 4 is formed on the surface of the flat glass 1 opposite to the buffer layer 2, and the curved tempered glass 3 is obtained as shown in fig. 11.

In detail, in the preparation method of the present invention, when the chemical strengthening temperature is between 350 ℃ and 480 ℃, the chemical strengthening treatment time is between 90 minutes and 410 minutes, and the thickness of the buffer layer is between 9 nanometers and 70 nanometers, the curved surface strengthened glass with the curvature radius of between 300 centimeters and 8000 centimeters can be obtained.

[ advantageous effects of the embodiments ]

The curved surface strengthened glass and the preparation method thereof have the beneficial effects that the curved surface strengthened glass can be obtained by simplifying the manufacturing process steps in the prior art through the technical scheme that the shielding of the buffer layer enables the ion exchange depth on the surface of the planar glass substrate to be different, so that the bending part is formed on the planar glass substrate at the position of the buffer layer, and the planar glass substrate is made into the curved surface strengthened glass. The preparation method of the invention not only simplifies the steps of the manufacturing process, but also reduces the manufacturing cost and the reject ratio of the product; in addition, the preparation method of the invention is different from the prior art which needs a forming die to manufacture, so the preparation method is not limited by the size of glass, and the preparation method is more widely applied. The curved surface strengthened glass obtained by the preparation method can also be applied to a glass panel of an electronic device or a glass protective film or a back shell of a portable electronic device.

Furthermore, the invention can further adjust the thickness of the buffer layer and the length of the chemical strengthening treatment time to obtain the curved surface strengthened glass with ideal curvature radius.

In addition, the curved surface strengthened glass obtained by the preparation method of the invention can be further chemically treated to remove the buffer layer or further form a metal plating layer according to requirements.

The disclosure is only a preferred embodiment of the invention and should not be taken as limiting the scope of the invention, so that the invention is not limited by the disclosure of the specification and drawings.