阅读说明：本技术 用于化学强化玻璃的组合物、方法及化学强化的玻璃 (Composition and method for chemically strengthened glass and chemically strengthened glass ) 是由 裴郁蕾 向前飞 崔静娜 张家鑫 于 2018-06-29 设计创作，主要内容包括：本公开涉及一种用于化学强化玻璃的组合物、方法及化学强化的玻璃。该组合物含有A组分和B组分,相对于100重量份的A组分,B组分的含量为25～70重量份；所述A组分为钾盐,所述B组分为钠盐和/或锂盐；所述A组分和B组分的阴离子相同,且A组分和B组分各自选自硫酸盐、碳酸盐和盐酸盐中的一种。本公开的组合物用于化学强化玻璃,能够通过一步强化将玻璃中的小半径金属离子置换为熔盐中的大半径离子,使玻璃表面发生膨胀,从而在玻璃表面形成压应力,达到强化的目的。该组合物能够使玻璃在400～600℃的较高温度下进行强化,从而促进离子交换、减少强化时间。本申请的组合物对玻璃进行化学强化,能缩短处理时间,玻璃仍保持透明,未生成结晶。(The present disclosure relates to a composition for chemically strengthening glass, a method and chemically strengthened glass. The composition comprises a component A and a component B, wherein the content of the component B is 25-70 parts by weight relative to 100 parts by weight of the component A; the component A is potassium salt, and the component B is sodium salt and/or lithium salt; the anions of the component A and the component B are the same, and the component A and the component B are respectively selected from one of sulfate, carbonate and hydrochloride. The composition disclosed by the invention is used for chemically strengthening glass, and can replace small-radius metal ions in the glass with large-radius ions in molten salt through one-step strengthening so as to expand the surface of the glass, thereby forming compressive stress on the surface of the glass and achieving the purpose of strengthening. The composition can strengthen the glass at a higher temperature of 400-600 ℃, thereby promoting ion exchange and reducing strengthening time. The composition of the present application chemically strengthens glass, shortens processing times, and allows the glass to remain transparent without crystallization.)

1. A composition for chemically strengthening glass, characterized by comprising an A component and a B component, wherein the B component is contained in an amount of 25 to 70 parts by weight relative to 100 parts by weight of the A component; the component A is potassium salt, and the component B is lithium salt and/or sodium salt; the anions of the component A and the component B are the same, and the component A and the component B are respectively selected from one of sulfate, carbonate and hydrochloride.

2. The composition for chemically strengthened glass according to claim 1, wherein the a component is K₂SO₄The component B is Na₂SO₄And/or Li₂SO₄The content of the component B is 28-65 parts by weight relative to 100 parts by weight of the component A.

3. The composition for chemically strengthening glass according to claim 1 or 2, wherein the B component is Na₂SO₄And Li₂SO₄Relative to 100 parts by weight of K₂SO₄，Li₂SO₄30 to 62 parts by weight of Na₂SO₄The content of (B) is 0.5-8 parts by weight.

4. The composition for chemically strengthened glass according to claim 3, wherein Li₂SO₄And K₂SO₄The total weight content of (A) and Na₂SO₄The weight ratio of (20-200): 1.

5. a method of chemically strengthening glass, the method comprising the steps of:

s1, mixing the composition of any claim 1 to 4, heating and melting to obtain a melt-strengthened solution;

s2, dipping the preheated glass into the molten strengthening liquid for chemical strengthening to obtain chemically strengthened glass;

the temperature of the molten strengthening liquid is 400-600 ℃, and the time of chemical strengthening is 50-150 min.

6. The method of claim 1, wherein the method further comprises: and S3, cooling the chemically strengthened glass, cleaning and drying.

7. Chemically strengthened glass produced by the method of claim 5 or 6.

8. The chemically strengthened glass according to claim 7, wherein the chemically strengthened glass has a surface stress of 600 to 750 MPa.

9. The chemically strengthened glass according to claim 7, wherein the chemically strengthened glass has a stress depth of 30 to 50 μm.

10. The chemically strengthened glass according to claim 7, wherein the chemically strengthened glass has a flexural strength of 550 to 750 MPa.

Technical Field

The present disclosure relates to the field of cover glass, and in particular, to a composition and method for chemically strengthening glass, and chemically strengthened glass.

Background

With the development of the touch screen market, consumers have a new trend of pursuing light and thin convenience of related products, which will promote the cover glass to be thinner. The rapid reduction of the thickness of the glass enables the thin glass to have the advantages of small volume, light weight and the like compared with the common glass, but the obvious defect is generated, namely the mechanical property of the glass is obviously reduced, and for improving the performance, a chemical strengthening method is often adopted for the thin glass. The molten salt for chemically strengthened glass mainly comprises potassium nitrate, the strengthening time of the potassium nitrate is long, and the production efficiency is low.

Disclosure of Invention

The purpose of the present disclosure is to provide a composition for chemically strengthening glass, which can shorten the processing time and improve the production efficiency when used for chemical strengthening.

In order to achieve the above object, a first aspect of the present disclosure provides a composition for chemically strengthened glass, the composition comprising an a component and a B component, the B component being present in an amount of 25 to 70 parts by weight relative to 100 parts by weight of the a component; the component A is potassium salt, and the component B is sodium salt and/or lithium salt; the anions of the component A and the component B are the same, and the component A and the component B are selected from one of sulfate, carbonate and hydrochloride.

Optionally, the component A is K₂SO₄The component B is Li₂SO₄And/or Na₂SO₄The content of the component B is 28-65 parts by weight relative to 100 parts by weight of the component A.

Optionally, the B component is Na₂SO₄And Li₂SO₄Relative to 100 parts by weight of K₂SO₄，Li₂SO₄30 to 62 parts by weight of Na₂SO₄The content of (B) is 0.5-8 parts by weight.

Alternatively, Li₂SO₄And K₂SO₄The total weight content of (A) and Na₂SO₄The weight ratio of (20-200): 1.

in a second aspect, the present disclosure provides a method of chemically strengthening glass, the method comprising the steps of: s1, mixing and heating to melt the composition of the first aspect of the disclosure to obtain a melt-strengthened solution; s2, dipping the preheated glass into the molten strengthening liquid for chemical strengthening to obtain chemically strengthened glass; the temperature of the molten strengthening liquid is 400-600 ℃, and the time of chemical strengthening is 50-150 min.

Optionally, the method further comprises: and S3, cooling the chemically strengthened glass, cleaning and drying.

A third aspect of the present disclosure provides a chemically strengthened glass produced by the method of the second aspect of the present disclosure.

Optionally, the chemically strengthened glass has a surface stress of 600 to 750 MPa.

Optionally, the chemically strengthened glass has a stress depth of 30 to 50 μm.

Optionally, the chemically strengthened glass has a bending strength of 550 to 750 MPa.

By adopting the technical scheme, the composition provided by the disclosure is used for chemically strengthening glass, and can replace small-radius metal ions in the glass with large-radius metal ions in molten salt through one-step strengthening so that the surface of the glass expands, thereby forming compressive stress on the surface of the glass and achieving the purpose of strengthening; compared with the prior nitrate composition which is strengthened at the temperature of 400-600 ℃, the nitrate is easy to decompose, is not beneficial to ion exchange, and cannot obtain better strengthening performance, so that the composition disclosed by the invention can provide a composition which is chemically strengthened within a properly improved temperature range, thereby improving the strengthening performance and shortening the strengthening time; in addition, the composition disclosed by the invention contains lithium salt and/or sodium salt, the melting point of the composition can be adjusted, the problem that the melting point of single-component potassium salt, especially potassium sulfate, is too high is solved, the composition with the proper melting point can be obtained by limiting the content range of the component A and the component B which are proper in the disclosure, and therefore, the glass can be strengthened at 400-600 ℃, on one hand, the rapid ion exchange can be promoted, the strengthening time can be shortened, on the other hand, the glass can be prevented from being deformed after being strengthened due to too high temperature, and the energy consumption can be saved. The composition of the present application chemically strengthens glass, can shorten the treatment time, and the glass remains transparent and does not generate crystals.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

The first aspect of the disclosure provides that the composition contains an A component and a B component, wherein the content of the B component is 25-70 parts by weight relative to 100 parts by weight of the A component; the component A is potassium salt, and the component B is sodium salt and/or lithium salt; the anions of the component A and the component B are the same, and the component A and the component B are respectively selected from one of sulfate, carbonate and hydrochloride.

The composition provided by the disclosure is used for chemically strengthening glass, and can replace small-radius metal ions in the glass with large-radius metal ions in molten salt through one-step strengthening, so that the surface of the glass expands, and compressive stress is formed on the surface of the glass, and the purpose of strengthening is achieved. The composition can strengthen the glass at a higher temperature of 400-600 ℃, thereby promoting ion exchange and reducing strengthening time. The composition of the present application chemically strengthens glass, can shorten the treatment time, and the glass remains transparent and does not generate crystals.

According to the present disclosure, the anions of the a-component and the B-component are the same, meaning that both the a-component and the B-component are sulfate salts, or both the a-component and the B-component are carbonate salts, or both the a-component and the B-component are hydrochloride salts.

To further enhance the chemical strengthening effect of the composition, both the A and B components are preferably sulfates, e.g., the A component may be K₂SO₄The component B may be Na₂SO₄And/or Li₂SO₄The content of the B component may be 28 to 65 parts by weight, preferably 30 to 62 parts by weight, relative to 100 parts by weight of the A component.

Further, in order to adjust the melting temperature, the B component may be Na₂SO₄And Li₂SO₄Relative to 100 parts by weight of K₂SO₄，Li₂SO₄The content of (b) may be 30 to 62 parts by weight; na (Na)₂SO₄The content of (b) may be 0.5 to 8 parts by weight, preferably 1 to 6.5 parts by weight. Relative to 100 parts by weight of K₂SO₄And Li₂SO₄，Na₂SO₄The content of (b) may be 0.5 to 5 parts by weight, preferably 0.8 to 4 parts by weight.

In accordance with the present disclosure, preferably, Li₂SO₄And K₂SO₄The total weight content of (A) and Na₂SO₄The weight ratio of (20-200): 1, preferably (25-125): 1.

in a second aspect, the present disclosure provides a method of chemically strengthening glass, the method comprising the steps of: s1, mixing and heating to melt the composition of the first aspect of the disclosure to obtain a melt-strengthened liquid; s2, immersing the preheated glass in the molten strengthening liquid for chemical strengthening so as to perform ion exchange between sodium ions in the glass and potassium ions in the molten salt, thereby obtaining the chemically strengthened glass; the temperature of the molten strengthening liquid is 400-600 ℃, and the time of chemical strengthening is 50-150 min.

Furthermore, in order to improve the comprehensive performance of the strengthened glass, in the method disclosed by the invention, the temperature of the molten strengthening liquid is preferably 450-550 ℃, and the time for chemical strengthening is preferably 60-120 min.

The method disclosed by the invention adopts the composition to carry out chemical strengthening treatment on the glass, so that the strengthened glass has higher surface stress, the strength of the glass is improved, meanwhile, the chemical strengthening treatment time is short, the production efficiency is high, and the strengthened glass can still keep transparent without crystallization. The meaning and method of operation of the chemical strengthening process in which small radius ions are present in the glass are well known to those skilled in the artCapable of exchanging with large radius ions in the molten salt to form a strengthened stress layer on the glass surface, e.g. Na in the glass⁺Can be mixed with K in molten salt⁺Exchange if the glass contains Li⁺It may also include Li in glass⁺With Na⁺The exchange of (2).

The glass used for strengthening may be conventional in the art, such as a cover glass, among others. The method for mixing, heating and melting the composition may be conventional in the art, and for example, the composition may be weighed according to the parts by weight, mixed well, added into a strengthening furnace, and heated and melted to obtain a molten strengthening liquid. The method for preheating the glass can be conventional in the field, and the temperature of the preheated glass can be 300-400 ℃, and is preferably 350-400 ℃.

According to the present disclosure, the method may further comprise: and S3, cooling, cleaning and drying the chemically strengthened glass to obtain a clean chemically strengthened glass product.

A third aspect of the present disclosure provides a chemically strengthened glass produced by the method of the second aspect of the present disclosure.

According to the disclosure, the chemically strengthened glass prepared by the method has high surface stress and large stress depth, and preferably, the surface stress of the chemically strengthened glass can be 600 to 750MPa, and preferably 650 to 730 MPa; the stress depth of the chemically strengthened glass can be 30-50 μm, and preferably 35-45 μm; the chemically strengthened glass may have a flexural strength of 550 to 750MPa, preferably 600 to 700 MPa. In the present disclosure, the surface stress and stress layer depth of the chemically strengthened glass may be measured using a Japanese bending prototype FSM-6000 surface stress tester, and the bending strength of the chemically strengthened glass may be measured using a Posett PT-307 three-point bending tester.

The present invention is further described below by way of examples, but the present disclosure is not limited thereto. In the following examples of the disclosure, the potassium sulfate used is 99.0% potassium sulfate in the chemical industry of Fuchen; the lithium sulfate is 99.0 percent of Tianjin compounded lithium sulfate; the sodium sulfate is 99.0% anhydrous sodium sulfate of Shanghai Chinese medicine; the potassium nitrate is 99.0 percent of the Shanghai nationality medicine, the other used reagents are all commercial products, and the glass used for chemical strengthening is third-generation gorilla glass purchased from corning.