Method for improving strength of AG TP glass
The alkaline pre-treatment and chemical strengthening process enhances AG TP glass strength by addressing surface defects and forming a uniform compressive stress layer, achieving a 90% pass rate in the 7-point ball drop test.
Patent Information
- Application Number
- CN202510499666.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-07-15
AI Technical Summary
AG TP glass has insufficient mechanical strength during chemical reinforcement, especially in the full 7-point ball drop test, which is 0%, which cannot meet the high reliability requirements.
The AG TP glass was treated with a mixed alkaline solvent at pH 12-13, and then ion exchange was performed in the molten salt of potassium nitrate to form a compressive stress layer with a depth of ≥10μm, the surface microcrack tip was etched away and impurity ions were complexed to avoid excessive corrosion.
The strength of AG TP glass has been significantly improved, making the pass rate of the ball drop test of 7 points full version reach ≥90%, and the compressive stress is increased by 20%-30%.
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of AG TP glass production, and specifically to a method for enhancing the strength of AG TP glass. Background Art
[0002] AG TP glass is widely used in electronic device screens due to its anti-glare properties. However, its surface microstructure results in insufficient mechanical strength. Especially in the full-page 7-point drop ball test (impact of a 150g steel ball from a height of 20cm), the passing rate of the traditional method through chemical strengthening alone is 0%, which cannot meet the high-reliability requirements. The reason is that chemical strengthening forms a compressive stress layer on the glass surface through ion exchange, but the rough surface of AG glass easily causes the expansion of microcracks, limiting the strength improvement. Summary of the Invention
[0003] In view of the above problems, the present invention provides a method for enhancing the strength of AG TP glass, and the passing rate of the full-page 7-point drop ball test of the obtained AG TP glass is ≥90%, which can reliably enhance the strength of AG TP glass.
[0004] A method for enhancing the strength of AG TP glass, characterized in that it comprises the following steps:
[0005] S1. Alkaline pretreatment: Immerse the AG TP glass in a mixed alkaline solvent with a pH of 12 - 13.
[0006] S2. Chemical strengthening: After the alkaline pretreatment of the AG TP glass, rinse the surface residue of the solution with deionized water, and then put it into a chemical strengthening furnace containing molten salt such as potassium nitrate, and carry out an ion exchange reaction at a high temperature to form a compressive stress layer on the glass surface.
[0007] S3. Performance testing: Package and store the AG TP glass that has passed the inspection.
[0008] It is further characterized in that:
[0009] In step S1, the mixed alkaline solvent is formulated by mass percentage as follows: 4 - 6% carbonate, 5 - 7% carbonate ester, 4 - 6% disodium ethylenediaminetetraacetate, 4 - 6% sodium hydroxide, and the balance is deionized water;
[0010] In step S1, the AG TP glass is immersed in the constant-temperature mixed alkaline solvent at 80 ± 5°C for 50 - 70 minutes, and then ultrasonically cleaned and dried;
[0011] In step S2, the AG TP glass is ion-exchanged in potassium nitrate molten salt at 400 - 500°C for 3 - 6 hours to form a compressive stress layer with a depth ≥10μm;
[0012] In step S3, a full-surface 7-point ball drop test is performed on the AG TP glass, and its passing rate is ≥ 90%.
[0013] For the AG TP glass after adopting the process of the present invention, the microcrack tips on the surface are gently etched off by alkaline pretreatment, the stress concentration points are passivated, and the surface impurity ions (such as Ca 2 +, Mg2+) are complexed, reducing the defect initiation sources. And because its pH is 12 - 13, over-corrosion can be avoided, a uniform prestress layer is formed, and the surface after pretreatment is more conducive to the deep exchange of K+-Na+, so that the compressive stress is increased by 20% - 30%. The passing rate of the full-surface 7-point ball drop test of the AG TP glass obtained by production is ≥ 90%, reliably improving the strength of the AG TP glass. Specific embodiments
[0014] A method for improving the strength of AG TP glass, which includes the following steps:
[0015] S1. Alkaline pretreatment: Immerse the AG TP glass in a mixed alkaline solvent with a pH of 12 - 13.
[0016] The mixed alkaline solvent is formulated by mass percentage as follows: 4 - 6% carbonate, 5 - 7% carbonate ester, 4 - 6% disodium ethylenediaminetetraacetate, 4 - 6% sodium hydroxide, and the balance is deionized water.
[0017] ; Specifically in implementation, the carbonate is selected as sodium / potassium carbonate, the carbonate ester is selected as propylene carbonate, and the disodium ethylenediaminetetraacetate is selected as EDTA-2Na, which enables the carbonate / ester to corrode synergistically, thereby gently etching the tips of the surface microcracks, passivating the stress concentration points, and chelating the surface impurity ions (such as Ca 2 +, Mg2+) through the chelating effect of EDTA, reducing the defect initiation sources, and controlling the reaction rate through sodium hydroxide to avoid over-corrosion, forming a uniform prestress layer, generating chemical strengthening synergy, making the surface of the AGTP glass after pretreatment more conducive to the deep exchange of K+-Na+, and increasing the compressive stress by 20% - 30%.
[0018] The AG TP glass is immersed in the constant-temperature mixed alkaline solvent at 80 ± 5°C for 50 - 70 minutes, and then ultrasonically cleaned and dried.
[0019] S2. Chemical strengthening: After the alkaline pretreatment of the AG TP glass, the surface residual solution is rinsed off with deionized water, and then it is put into a chemical strengthening furnace containing a molten salt such as potassium nitrate for an ion exchange reaction at high temperature to form a compressive stress layer on the glass surface.
[0020] Specifically in implementation, the AG TP glass is ion-exchanged in potassium nitrate molten salt at 400 - 420°C for 4 - 6 hours to form a compressive stress layer with a depth ≥ 10 μm.
[0021] In step S3, a full-surface 7-point ball-drop test is performed on the AG TP glass, and its passing rate ≥ 90%.
[0022] The surface microcrack tips of the AG TP glass are gently etched off through alkaline pretreatment to passivate stress concentration points, and surface impurity ions (such as Ca 2 +, Mg2+) are complexed to reduce the defect initiation sources. Moreover, since its pH is 12 - 13, over-corrosion can be avoided, and a uniform prestress layer is formed. The pretreated surface is more conducive to the deep exchange of K+-Na+, resulting in a 20% - 30% increase in the compressive stress. The passing rate of the full-surface 7-point ball-drop test of the AG TP glass obtained by this production is ≥ 90%, reliably improving the strength of the AG TP glass.
[0023] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.
[0024] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A method for enhancing the strength of AG TP glass, characterized in that, It includes the following steps: S1. Alkaline pretreatment: Immerse the AG TP glass in a mixed alkaline solvent with a pH of 12 - 13. S2. Chemical strengthening: After the alkaline pretreatment, rinse the surface of the AG TP glass with deionized water to remove the residual solution, and then put it into a chemical strengthening furnace containing a molten salt such as potassium nitrate for an ion exchange reaction at a high temperature to form a compressive stress layer on the glass surface. S3. Performance testing: Pack and store the AG TP glass that has passed the inspection.
2. A method for enhancing the strength of AG TP glass according to claim 1, characterized in that, In step S1, the mixed alkaline solvent is formulated by mass percentage as follows: 4 - 6% carbonate, 5 - 7% carbonate ester, 4 - 6% disodium ethylenediaminetetraacetate, 4 - 6% sodium hydroxide, and the balance is deionized water.
3. A method for enhancing the strength of AG TP glass according to claim 1, characterized in that: In step S1, the AG TP glass is immersed in the constant-temperature mixed alkaline solvent at 80 ± 5 °C for 50 - 70 minutes, followed by ultrasonic cleaning and drying.
4. A method for enhancing the strength of AG TP glass according to claim 1, characterized in that: In step S2, the AG TP glass undergoes ion exchange in potassium nitrate molten salt at 400 - 500 °C for 3 - 6 hours to form a compressive stress layer with a depth ≥ 10 μm.
5. A method for enhancing the strength of AG TP glass according to claim 1, characterized in that: In step S3, a full-page 7-point ball-drop test is conducted on the AG TP glass, and its passing rate ≥ 90.