CN117756404A - Cover glass based on chemical reinforcement and preparation method thereof - Google Patents
Cover glass based on chemical reinforcement and preparation method thereof Download PDFInfo
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- CN117756404A CN117756404A CN202311656780.0A CN202311656780A CN117756404A CN 117756404 A CN117756404 A CN 117756404A CN 202311656780 A CN202311656780 A CN 202311656780A CN 117756404 A CN117756404 A CN 117756404A
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- ion exchange
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- 239000000126 substance Substances 0.000 title claims abstract description 11
- 230000002787 reinforcement Effects 0.000 title claims abstract description 6
- 239000006059 cover glass Substances 0.000 title claims description 18
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000011521 glass Substances 0.000 claims abstract description 72
- 238000005342 ion exchange Methods 0.000 claims abstract description 64
- 150000003839 salts Chemical class 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000011734 sodium Substances 0.000 claims abstract description 16
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 14
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000003426 chemical strengthening reaction Methods 0.000 claims description 10
- 159000000000 sodium salts Chemical class 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims 1
- 239000002243 precursor Substances 0.000 claims 1
- 239000005357 flat glass Substances 0.000 abstract description 16
- 238000007906 compression Methods 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 11
- 229910052700 potassium Inorganic materials 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011591 potassium Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 4
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 238000002791 soaking Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 229910003251 Na K Inorganic materials 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007495 chemical tempering process Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Surface Treatment Of Glass (AREA)
Abstract
The invention discloses cover plate glass based on chemical reinforcement and a preparation method thereof, and belongs to the technical field of cover plate glass, wherein the cover plate glass is treated by two rounds of ion exchange treatment during preparation, a glass raw sheet is treated by high-sodium low-potassium molten salt for the first time, a compression layer is formed on the surface of the glass raw sheet, the ion exchange treatment is further carried out by the high-potassium low-sodium molten salt for the second time, and the requirement on ion exchange liquid molten salt CS is reduced during the first time of treatment by carrying out the ion exchange treatment for the second time, so that molten salt is fully utilized, frequent replacement of the molten salt is avoided, and the cost is reduced; and Li2O is added into the raw material of the glass raw sheet, so that the effect of the first ion exchange can be ensured, and a compression layer with a certain thickness can be formed on the surface of the glass raw sheet after the first ion exchange is finished.
Description
Technical Field
The invention belongs to the technical field of cover glass, and particularly relates to cover glass based on chemical reinforcement and a preparation method thereof.
Background
The Cover Glass is mainly applied to the outermost layer of a display screen, and is also called Cover Lens or Cover Glass, which is also called reinforced optical Glass, glass window, reinforced Lens and the like. Has the advantages of high strength, high wear resistance, high impact resistance and the like, the method is widely applied to smart phones, tablet personal computers, smart watches, vehicle-mounted equipment and the like. The product is mainly made of ultra-thin plate glass, and has the functions of preventing impact, scraping, resisting oil stain, preventing fingerprints, enhancing light transmittance and the like after being subjected to cutting, CNC engraving, thinning, strengthening, coating, printing and other processes. After the cover plate glass is attached to the outer surface layer of the display screen, the effect of protecting the touch screen is achieved, and different colors, patterns and marks can be printed on the other hand, so that the effects of decorating and beautifying products are achieved.
In the prior art, when the cover glass is chemically strengthened, a compression layer is formed on the surface of a glass raw sheet through ion exchange, so that the purpose of strengthening is achieved, but the problem of short service cycle of molten salt exists, the strengthening effect is further improved, and the following technical scheme is provided for solving the problem.
Disclosure of Invention
The invention aims to provide cover plate glass based on chemical strengthening and a preparation method thereof, which solve the problem of short service cycle of molten salt in the prior art when the chemical strengthening is carried out, and further optimize and improve the surface compressive stress intensity of the treated cover plate glass.
The aim of the invention can be achieved by the following technical scheme:
the glass raw sheet formula of the cover plate glass based on chemical reinforcement comprises the following components in percentage by weight:
60% -70% of SiO 2 16% -21% of Al 2 O 3 8.5 to 12 percent of Na 2 O、1.5％-3％Li 2 O、0.5％-1.8％B 2 O 3 0.5 to 4 percent of ZnO and 1 to 3 percent of TiO 2 。
Further, the chemical strengthening method of the cover glass comprises the following steps:
stp1, pre-treating the original piece of glass, cleaning and drying;
stp2, performing a first ion exchange treatment, and immersing the glass raw sheet into a first ion exchange liquid;
the first ion exchange liquid meets the requirement that the CS of molten salt is more than 300Mpa;
stp3, carrying out secondary ion exchange treatment, and adding the glass raw sheet subjected to the primary ion exchange treatment into a second ion exchange liquid;
the second ion exchange liquid meets the requirement that the CS of molten salt is more than 800Mpa.
Further, the first ion exchange liquid is a molten salt of potassium salt and sodium salt in a molar ratio of 20-60:100; the second ion exchange liquid is a molten salt of sodium salt and potassium salt in a molar ratio of 0-20:100.
And further, after the second ion exchange treatment is finished, adding the glass raw sheet subjected to the ion exchange treatment for two times into an annealing furnace, performing heat treatment at the temperature of 500-600 ℃ for 30-50min, and then quenching the glass raw sheet subjected to the heat treatment to obtain the cover plate glass.
The invention has the beneficial effects that:
1. the invention can obviously improve the surface compressive stress intensity and the stress depth of the cover plate glass;
2. according to the invention, through two rounds of ion exchange treatment, the glass raw sheet is treated through high-sodium low-potassium molten salt for the first time, a compression layer is formed on the surface of the glass raw sheet through exchange among Li-Na, li-K and Na-K, and the compression layer can increase the compression stress on the surface of the glass, so that the strength and impact resistance of the glass are improved, the ion exchange treatment, especially the exchange among Na-K, is further carried out through the high-potassium low-sodium molten salt in the second time, and the requirement on the ion exchange liquid molten salt CS is reduced in the first time through the two times of ion exchange treatment, so that the molten salt is fully utilized, frequent replacement of the molten salt is avoided, and the cost is reduced;
3. the invention is characterized in that Li is added into the raw material of the glass raw sheet 2 O can ensure the effect of the first ion exchange and can form a compression layer with a certain thickness on the surface of the glass sheet after the first ion exchange is finished.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The glass raw sheet formula of the cover glass comprises the following components in percentage by weight:
60% -70% of SiO 2 16% -21% of Al 2 O 3 8.5 to 12 percent of Na 2 O、1.5％-3％Li 2 O、0.5％-1.8％B 2 O 3 0.5 to 4 percent of ZnO and 1 to 3 percent of TiO 2 ；
SiO 2 Is an essential component constituting the glass skeleton, and its content affects the chemical resistance and mechanical strength of the glass, and also affects the density of the glass. The higher the content, the higher the chemical resistance and mechanical strength of the glass, while increasing the high temperature viscosity of the glass, making it difficult to melt the glass.
Al 2 O 3 Is an essential component for ensuring the chemical stability of glass, can promote the ion exchange speed of chemical tempering and improve the chemical strengthening characteristic. The glass with high content has higher surface compressive stress after chemical strengthening and thicker stress layer, but is unfavorable for molding if the glass is too high.
Li 2 O and Na 2 O is a chemicalThe main ion exchange in the tempering treatment process contains Li + The ion exchange speed of the glass is higher, so that the glass can obtain a thicker strengthening layer. Li (Li) + Ions and Na in the melt + Ion exchange, and speed ratio Na + And K is equal to + The ion exchange speed is high.
B 2 O 3 The ion exchange speed in the chemical tempering process can be promoted;
the ZnO can increase the compressive strength and the bending strength of the glass, improve the reliability and the safety of the glass in industrial production, and play a role in adjusting the transparency of the glass;
TiO 2 the optical properties of the glass can be improved, and the weather resistance and the light resistance of the glass can be improved. The ultraviolet-resistant glass has excellent ultraviolet resistance, can effectively absorb ultraviolet rays and prevent the damage of the ultraviolet irradiation to the glass.
The method for carrying out chemical strengthening on the basis of the glass raw sheet further comprises the following steps:
stp1, pre-treating the original piece of glass, cleaning, drying, and entering the next step, wherein the purpose of the pre-treatment is to ensure the smoothness and flatness of the surface of the original piece of glass;
stp2, carrying out a first ion exchange treatment, specifically adding a glass raw sheet into a first ion exchange liquid, and soaking for 3-7 hours at 340-370 ℃;
the first ion exchange liquid is a molten salt of potassium salt and sodium salt in a molar ratio of 20-60:100;
the first ion exchange liquid meets the requirement that the CS of molten salt is more than 300Mpa;
stp3, carrying out a second ion exchange treatment, specifically adding the glass raw sheet subjected to the first ion exchange treatment into a second ion exchange liquid, and soaking at 380-400 ℃ for 2-5 hours;
the second ion exchange liquid is a molten salt of sodium salt and potassium salt with a molar ratio of 0-20:100;
the second ion exchange liquid meets the requirement that the CS of molten salt is more than 800Mpa;
stp4, annealing treatment, namely adding the glass raw sheet subjected to the ion exchange treatment twice into an annealing furnace, performing heat treatment at the temperature of 500-600 ℃ for 30-50min, and then quenching the glass raw sheet subjected to the heat treatment to obtain cover plate glass;
as the quenching, usable liquid-phase quenching substances such as air, inert gas and mineral oil can be used.
According to the invention, through two rounds of ion exchange treatment, the glass raw sheet is treated through high-sodium low-potassium molten salt for the first time, and through exchange among Li-Na, li-K and Na-K, a compression layer is formed on the surface of the glass raw sheet, and the compression layer can increase the compression stress on the surface of the glass, so that the strength and impact resistance of the glass are improved, and in the second time, the ion exchange treatment, especially the exchange among Na-K, is further carried out through the high-potassium low-sodium molten salt, and the ion exchange treatment is carried out for the second time, so that the whole treatment time is prolonged, but the requirement on the molten salt CS of the ion exchange liquid is reduced in the first treatment, so that the molten salt is fully utilized, frequent replacement of the molten salt is avoided, and the cost is reduced;
by adding Li to the raw material of the glass sheet 2 O can also ensure the effect of the first ion exchange, and can form a compression layer with a certain thickness on the surface of the glass sheet after the first ion exchange is finished.
Examples
The method comprises the steps of adjusting the raw material composition of a glass original plate, processing the glass original plate under the following conditions, cutting the processed cover plate glass into specifications of 120mm 50mm 0.7mm, detecting the surface compressive stress intensity and the stress depth, and measuring the stress intensity and the stress depth by adopting a surface stress meter according to the specific results shown in Table 1;
the treatment method comprises the following steps: stp1, pretreating raw glass, cleaning and drying;
stp2, adding the glass raw sheet into molten salt of potassium salt and sodium salt in a molar ratio of 40:100, and soaking for 4.5 hours at the temperature of 360 ℃;
the first ion exchange liquid meets the requirement of molten salt CS=380-400 Mpa;
stp3, adding the glass raw sheet subjected to the first ion exchange treatment into molten salt of potassium salt, soaking at 400 ℃ for 2 hours, and melting salt CS=860-880 Mpa;
stp4 is subjected to heat treatment at 540-550 ℃ for 40min, and air quenching is performed, wherein the cooling speed is 80-85 ℃/s, so that the cover plate glass is obtained.
TABLE 1
| Stress intensity/Mpa | Stress depth/. Mu.m | |
| Example 1 | 907 | 41 |
| Example 2 | 887 | 38 |
| Example 3 | 843 | 34 |
The corresponding formulation of example 1 is: 67% SiO 2 17% Al 2 O 3 9% Na 2 O、2.5％Li 2 O,1% B 2 O 3 2% ZnO, 1.5% TiO 2 ；
The corresponding formulation of example 2 is: 67% SiO 2 17% Al 2 O 3 9% Na 2 O、2.5％K 2 O,1% B 2 O 3 2% ZnO, 1.5% TiO 2 ；
The corresponding formulation of example 3 is: 67% SiO 2 17% Al 2 O 3 11.5% Na 2 O,1% B 2 O 3 2% ZnO, 1.5% TiO 2 。
The surface compressive stress intensity and the stress depth of the cover plate glass obtained after the treatment are detected by adjusting the parameters of the treatment of the glass original plate, the specific results are shown in table 2, and the stress intensity and the stress depth are measured by adopting a surface stress meter;
the formula of the glass raw plate comprises the following components: 67% SiO 2 17% Al 2 O 3 9% Na 2 O、2.5％Li 2 O,1% B 2 O 3 2% ZnO, 1.5% TiO 2 ；
TABLE 2
The treatment method in example 4 is: stp1, pretreating raw glass, cleaning and drying;
stp2, adding the glass raw sheet into molten salt of potassium salt and sodium salt in a molar ratio of 40:100, and soaking for 4.5 hours at the temperature of 360 ℃;
the first ion exchange liquid meets the requirement of molten salt CS=380-400 Mpa;
stp3, adding the glass raw sheet subjected to the first ion exchange treatment into molten salt of potassium salt, soaking at 400 ℃ for 2 hours, and melting salt CS=860-880 Mpa;
stp4 is subjected to heat treatment at 540-550 ℃ for 40min, and air quenching is performed, wherein the cooling speed is 80-85 ℃/s, so that the cover plate glass is obtained.
The treatment method in example 5 is:
stp1, pretreating raw glass, cleaning and drying;
stp2, adding the glass raw sheet into molten salt of potassium salt, soaking for 3.5 hours at 400 ℃, and melting salt CS=860-880 Mpa;
stp3, heat treatment for 40min at 540-550 ℃, air quenching, and cooling at 80-85 ℃/s to obtain cover glass.
The treatment method in example 6 is:
stp1, pretreating raw glass, cleaning and drying;
stp2, adding the glass raw sheet into molten salt of potassium salt, soaking for 3.5 hours at 400 ℃, and melting salt CS=860-880 Mpa.
According to the detection result, the invention can obviously improve the surface compressive stress intensity and the stress depth of the cover plate glass.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (7)
1. The cover glass based on chemical reinforcement is characterized in that the glass raw sheet formula of the cover glass comprises the following components in percentage by weight:
60% -70% of SiO 2 16% -21% of Al 2 O 3 8.5 to 12 percent of Na 2 O、1.5％-3％Li 2 O、0.5％-1.8％B 2 O 3 0.5 to 4 percent of ZnO and 1 to 3 percent of TiO 2 。
2. The cover glass based on chemical strengthening according to claim 1, wherein the method of chemical strengthening of the cover glass comprises the steps of:
stp1, pre-treating the original piece of glass, cleaning and drying;
stp2, performing a first ion exchange treatment, and immersing the glass raw sheet into a first ion exchange liquid;
the first ion exchange liquid meets the requirement that the CS of molten salt is more than 300Mpa;
stp3, carrying out secondary ion exchange treatment, and adding the glass raw sheet subjected to the primary ion exchange treatment into a second ion exchange liquid;
the second ion exchange liquid meets the requirement that the CS of molten salt is more than 800Mpa.
3. The chemically strengthened cover glass according to claim 2, wherein the glass precursor is immersed in the first ion exchange liquid at a temperature of 340-370 ℃ for 3-7 hours.
4. A cover glass based on chemical strengthening according to claim 3, wherein the glass raw sheet is immersed in the second ion exchange liquid for 2-5 hours at a temperature of 380-400 ℃.
5. The chemically strengthened cover glass of claim 2 wherein the first ion exchange liquid is a molten salt of potassium salt and sodium salt in a molar ratio of 20-60:100; the second ion exchange liquid is a molten salt of sodium salt and potassium salt in a molar ratio of 0-20:100.
6. The chemically strengthened cover glass of claim 5 wherein the first ion exchange fluid is a molten salt of potassium salt and sodium salt in a molar ratio of 40:100.
7. The cover glass based on chemical strengthening according to claim 1, wherein the glass raw sheet subjected to the ion exchange treatment twice is further added to an annealing furnace after the completion of the ion exchange treatment twice, heat-treated at a temperature of 500-600 ℃ for 30-50min, and then the heat-treated glass raw sheet is quenched to obtain the cover glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311656780.0A CN117756404A (en) | 2023-12-06 | 2023-12-06 | Cover glass based on chemical reinforcement and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311656780.0A CN117756404A (en) | 2023-12-06 | 2023-12-06 | Cover glass based on chemical reinforcement and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117756404A true CN117756404A (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311656780.0A Pending CN117756404A (en) | 2023-12-06 | 2023-12-06 | Cover glass based on chemical reinforcement and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117756404A (en) |
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2023
- 2023-12-06 CN CN202311656780.0A patent/CN117756404A/en active Pending
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