Alkaline aluminosilicate glass, its preparation process and applications

Abstract

The present invention discloses an alkaline aluminosilicate glass, its preparation process and applications. The alkaline aluminosilicate glass comprises raw materials in the following mass percentages: 58-65% of SiO₂, 13-15% of Al₂O₃, 12-15% of Na₂O, 0-6% of K₂O, 3-5% of alkaline earth metals and 0-1% of ZrO₂; and the compressive stress of the glass is CS, wherein the CS satisfies: 700 Mpa ≤ CS ≤ 800 Mpa; the depth of the compressive stress layer of the glass is DOL, wherein the DOL satisfies: 30 μm ≤ DOL ≤ 40 μm; the impact resistance energy of the glass is CT, wherein the CT satisfies: CT ≥ 0.8 J. It has a relatively high glass stress, the depth of the compressive stress layer of the glass and excellent impact resistance performance. Moreover, when the vehicle window made of the alkaline aluminosilicate glass of the present invention is broken, the state meets the safety requirements of the country for automotive window glass.

Description

Technical Field

[0001] The present invention relates to the field of glass products, and in particular to an alkaline aluminosilicate glass, its preparation process and applications. Background Art

[0002] In the prior art, alkaline aluminosilicate glass is particularly suitable for making thinner glass products. For example, by using ion exchange (IX) technology to treat alkaline aluminosilicate glass, a high level of compressive stress can be generated in the glass, making it suitable for manufacturing strong and lightweight automotive window glasses. However, when the above glass is broken, a large number of long strip-shaped fragments will appear, and the ends are in the shape of blades, which cannot meet the requirements of national standards for automotive safety glass.

[0003] This is because during the driving of an automobile, it is inevitable that the window is impacted by sand, gravel and other various particulate objects. After being impacted by gravel or fragments, microcracks generated on the glass surface are about dozens of micrometers, so the scratch resistance of the window glass is weak, which will directly affect the appearance and service life of the window.

[0004] Therefore, it is necessary to enhance the scratch resistance and safety performance after breaking of the alkaline aluminosilicate glass. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide an alkaline aluminosilicate glass with high scratch resistance and high safety performance after breaking.

[0006] Another object of the present invention is to provide a preparation method for the alkaline aluminosilicate glass.

[0007] Another object of the present invention is to provide an application of the alkaline aluminosilicate glass in automotive windows.

[0008] The alkaline aluminosilicate glass according to the first aspect embodiment of the present invention comprises raw materials in the following mass percentages: 58 - 65% of SiO2, 13 - 15% of Al2O3, 12 - 15% of Na2O, 0 - 6% of K2O, 3 - 5% of alkaline earth metals and 0 - 1% of ZrO2; and, the compressive stress of the glass is CS, wherein, the CS satisfies: 700 Mpa ≤ CS ≤ 800 Mpa; the depth of the compressive stress layer of the glass is DOL, wherein, the DOL satisfies: 30 μm ≤ DOL ≤ 40 μm; the impact resistance energy of the glass is CT, wherein, the CT satisfies: CT ≥ 0.8 J.

[0009] According to some embodiments of the present invention, the alkaline earth metal oxide is magnesium oxide.

[0010] According to an embodiment of the second aspect of the present invention, the present invention provides a preparation process of an alkaline aluminosilicate glass according to the above-mentioned first aspect embodiment of the present invention, including physical tempering treatment and chemical tempering treatment of an alkaline aluminosilicate glass sample. The temperature of the physical tempering treatment is 620-780°C, and the time is 180-300 s; and / or the temperature of the chemical tempering treatment is 400-450°C, and the time is 120-300 min.

[0011] According to some embodiments of the present invention, the thickness of the silicate glass sample is ≥1.1 mm.

[0012] According to some embodiments of the present invention, a tempering salt is added in the step of chemical tempering. Preferably, the tempering salt is potassium nitrate.

[0013] According to some embodiments of the present invention, it includes the following steps: Step 1, clean and preheat the alkaline aluminosilicate glass sample; Step 2, perform physical tempering treatment on the silicate glass sample processed in Step 1, and then cool it. Step 3, perform secondary cleaning and preheating on the silicate glass sample processed in Step 2; Step 4, perform chemical tempering treatment on the silicate glass sample obtained in Step 3 to form a silicate glass product.

[0014] According to some embodiments of the present invention, in Step 1, the temperature of the preheating is 600-720°C, and the time is 120-`180 s.

[0015] According to some embodiments of the present invention, the pressure of the cooling is 8000-12000 Pa, and the time is 30-60 s; and / or the temperature of the preheating is 350-380°C, and the time of the preheating is 30-60 min.

[0016] According to an embodiment of the third aspect of the present invention, the present invention provides an application of the alkaline aluminosilicate glass according to the above-mentioned first aspect embodiment or the glass prepared by the preparation process according to the above-mentioned second aspect embodiment, and the glass is applied to an automobile window.

[0017] Beneficial effects

[0018] The alkaline aluminosilicate glass according to a specific embodiment of the present invention has a relatively high glass stress, the depth of the compressive stress layer of the glass, and excellent impact resistance. Specifically, the CS satisfies: 700 Mpa ≤ CS ≤ 800 Mpa; the DOL satisfies: 30 μm ≤ DOL ≤ 40 μm; the CT satisfies: CT > 0.8 J. And when the window made of the alkaline aluminosilicate glass of the present invention is broken, the state meets the safety requirements of the country for automobile window glass.

[0019] In addition, the alkaline earth metal content of the glass of a specific embodiment of the present invention, expressed as a mass percentage of alkaline earth metal oxide, is w, where w satisfies the following: w ≤ 5%. The high stress of alkali aluminosilicate glass is due to the fact that alkali aluminosilicate glass can be treated using ion exchange (IX) technology. This treatment produces high levels of compressive stress in the glass, reaching up to approximately 1000 MPa at the surface, resulting in high strength and being ideal for manufacturing strong, lightweight automotive windows. The strength of the treated glass generally depends on its CS, DOL, and CT values. A higher CS, a deeper DOL, and a lower CT value indicate a higher theoretical strength. However, as the CS value of the glass increases, the tempered glass exhibits elongated, sharp-angled shapes after a falling ball impact, which can cause the glass to fail to meet national standards for automotive glass. Therefore, it is necessary to control the alkaline earth metal content in the alkali aluminosilicate glass of the present invention. When the alkaline earth metal content in the glass decreases, the ion exchange rate decreases, and its CS or DOL decreases. When the MgO content is between 3% and 5%, the alkali aluminosilicate glass of the present invention not only has higher impact resistance but also improves the state of glass fragments after strengthening. While the CS and DOL of alkali aluminosilicate glass are reduced after chemical strengthening, the reduction range should be limited to a minimum, otherwise the drop ball impact strength of the final glass will be affected.

[0020] The preparation process of the alkaline aluminosilicate glass of the present invention includes physical tempering treatment and chemical tempering treatment of the alkaline aluminosilicate glass sample, and the two act synergistically to achieve the strengthening preparation of the silicate glass. Specifically, the thickness of the alkaline aluminosilicate glass sample used in the present invention is greater than or equal to 1.1 mm. Combining specific experiments, it is found that when the thickness of the alkaline aluminosilicate glass sample is less than 1.1 mm, during physical strengthening, its strengthening efficiency is very low, the fragment ratio is as high as more than 50%, and the deformation of the glass is serious, which is not suitable for physical strengthening. While for the glass with a thickness of the alkaline aluminosilicate glass sample greater than 1.1 mm, its fragment ratio is smaller and the deformation is within a suitable range. Further, the treatment of the alkaline aluminosilicate glass sample of the present invention includes the steps of preheating the alkaline aluminosilicate glass sample, physical tempering treatment and chemical tempering treatment, which are specifically as follows: The step of preheating the alkaline aluminosilicate glass sample includes placing the alkaline aluminosilicate glass sample in the preheating area of the physical tempering furnace for preheating. By setting the preheating temperature of the glass to 600 - 720 °C and the preheating time to 120 s - 180 s, the glass itself reaches a semi-plastic state before entering the tempering temperature, eliminating the stress of the glass. Physical tempering is carried out on the preheated silicate glass sample. The temperature, time and tempering air pressure of physical tempering play an important role in the tempering degree and surface stress formation of the glass, and need to be determined according to the different physical and chemical properties and thickness of the glass. When the thickness of the alkaline aluminosilicate glass sample is less than 1.1 mm, the preheated glass sample is transported to the physical tempering area in the physical tempering furnace through the conveyor track, the tempering temperature is 650 - 780 °C, and the holding time is 90 - 120 seconds. The silicate glass sample is cooled by a cooling fan, the pressure of the cooling fan is 10000 - 30000 Pa, and the time is 30 - 60 seconds. The air temperature during quenching is lower than 35 °C. The stress of the glass sample after the above physical tempering is between 120 - 300 Mpa. After physical tempering, the glass can retain a granular distribution of physical tempered glass when broken, so as to avoid the formation of obtuse long strip shapes when the aluminosilicate glass product is damaged by impact after tempering, thus meeting the relevant safety standards. Before chemical tempering of the aluminosilicate glass part, the secondary preheating temperature is 350 - 380 °C and the preheating time is 30 - 60 min. At this temperature and time, the thermal uniformity of the physically tempered glass is better, which can avoid uneven stress during chemical tempering. The chemical tempering temperature of the aluminosilicate glass part is 400 - 450 °C, and the chemical tempering time is 120 - 00 min.The chemical tempering time and temperature should not be too long, otherwise the compressive stress CS of the aluminosilicate glass will be too large, eliminating the physical tempering effect and causing the glass to easily show a long strip and obtuse angle shape when broken. The condition for determining whether the compressive stress CS of the aluminosilicate glass after chemical tempering is too large is whether the surface compressive stress CS is greater than 700 Mpa and less than 850 Mpa. When the compressive stress of chemical tempering is greater than 850 Mpa, the fragment state will change, and when the CS compressive stress is less than 700 Mpa, its impact resistance cannot meet the standard requirements. Therefore, the compressive stress of the aluminosilicate glass is between 700 and 850 Mpa.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the state of the glass after breaking according to a specific embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the state of the conventional high-aluminum glass after breaking. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following specifically describes the alkaline aluminosilicate glass and its preparation process according to specific embodiments of the present invention in combination with specific embodiments.

[0025] Example 1

[0026] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 60.65% of SiO2, 14.41% of Al2O3, 13.38% of Na2O, 5.86% of K2O, 4.95% of MgO, 0.81% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 780 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 40 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 1.1 J.

[0027] Its preparation process includes the following steps:

[0028] Step 1: Wash the alkaline aluminosilicate glass sample with deionized water to remove the glass fragments and impurities on the surface of the sample, where the thickness of the sample is 1.1 mm; then place the washed sample on the conveyor roller and enter the physical tempering furnace for preheating. The preheating is carried out from room temperature (25 °C) to 680 °C, and the preheating time is 180 s.

[0029] Step 2: Physically temper the aluminosilicate glass sample that has been preheated in Step 1. The specific steps are as follows: Feed the preheated glass into the physical tempering area through a conveyor belt. The physical tempering temperature is 620°C, and the tempering time is 300 s. In the cooling zone, air cooling is used for strengthening. The fan pressure is 12,000 Pa, the time is 40 s, and the air cooling temperature is 32°C.

[0030] Step 3: Perform secondary cleaning and preheating on the sample processed in Step 2. The specific steps are as follows: Wash the sample after physical tempering in Step 2 with deionized water and then feed it into a tempering furnace for preheating. The preheating temperature is 360°C, and the time is 30 min.

[0031] Step 4: Chemically temper the silicate glass sample obtained in Step 3 to form a silicate glass product. The chemical strengthening temperature is 420°C, the tempering molten salt is pure potassium nitrate, and the strengthening time is 210 min. The sample is naturally cooled and annealed in the furnace to below 100°C and then taken out. After the sample is cooled to room temperature, it is washed and dried. The alkaline aluminosilicate glass numbered 1 is obtained.

[0032] Example 2

[0033] Example 2 is basically the same as Example 1, except that

[0034] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 60.82% of SiO2, 13.58% of Al2O3, 14.65% of Na2O, 5.95% of K2O, 4.13% of MgO, 0.87% of ZrO2; and the compressive stress of the glass is CS, where CS satisfies: CS = 752 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 36 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 0.8 J. The alkaline aluminosilicate glass numbered 2 is obtained.

[0035] Example 3

[0036] Example 3 is basically the same as Example 1, except that

[0037] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 61.35% of SiO2, 14.58% of Al2O3, 14.55% of Na2O, 5.12% of K2O, 3.58% of MgO, 0.82% of ZrO2; and the compressive stress of the glass is CS, where CS satisfies: CS = 775 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 38 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 0.9 J. The alkaline aluminosilicate glass numbered 3 is obtained.

[0038] Example 4

[0039] Example 4 is basically the same as Example 1, except that

[0040] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 61.33% of SiO2, 14.25% of Al2O3, 14.28% of Na2O, 5.12% of K2O, 3.58% of MgO, 0.82% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 775 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 38 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 0.9 J. The alkaline aluminosilicate glass numbered 4 is obtained.

[0041] Example 5

[0042] Example 5 is basically the same as Example 1, except that

[0043] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 58% of SiO2, 15% of Al2O3, 15% of Na2O, 6% of K2O, 5% of MgO, 1% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 785 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 42 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 1.2 J. The alkaline aluminosilicate glass numbered 5 is obtained.

[0044] And, during the preparation process, the physical tempering temperature is 630 °C and the tempering time is 280 s; the chemical tempering temperature is 430 °C and the tempering time is 200 min.

[0045] Example 6

[0046] Example 6 is basically the same as Example 1, except that

[0047] An alkaline aluminosilicate glass, including the following raw materials and their mass percentages: 65% of SiO2, 13% of Al2O3, 14.05% of Na2O, 3.95% of K2O, 4% of MgO; and, the compressive stress of the glass is CS, where CS satisfies: CS = 775 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 38 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 1.2 J. The alkaline aluminosilicate glass numbered 6 is obtained.

[0048] Moreover, during the preparation process, the physical tempering temperature is 650 °C and the tempering time is 280 s; the chemical tempering temperature is 420 °C and the tempering time is 220 min.

[0049] Example 7

[0050] Example 7 is basically the same as Example 1, except that

[0051] An alkaline aluminosilicate glass, comprising the following raw materials and their mass percentages: 61% of SiO2, 14% of Al2O3, 15% of Na2O, 6% of K2O, 3% of MgO, 1% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 781 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 39 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 1.1 J. The alkaline aluminosilicate glass numbered 7 is obtained.

[0052] Moreover, during the preparation process, the physical tempering temperature is 660 °C and the tempering time is 280 s; the chemical tempering temperature is 420 °C and the tempering time is 250 min.

[0053] Example 8

[0054] Example 8 is basically the same as Example 1, except that

[0055] An alkaline aluminosilicate glass, comprising the following raw materials and their mass percentages: 64.53% of SiO2, 13.97% of Al2O3, 12% of Na2O, 3.5% of K2O, 5% of MgO, 1% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 775 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 41 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 0.9 J. The alkaline aluminosilicate glass numbered 8 is obtained.

[0056] Moreover, during the preparation process, the physical tempering temperature is 670 °C and the tempering time is 280 s; the chemical tempering temperature is 430 °C and the tempering time is 190 min.

[0057] Example 9

[0058] Example 9 is basically the same as Example 1, except that

[0059] CS = 765 Mpa, DOL = 39 μm, CT = 1.1 J. The alkaline aluminosilicate glass numbered 9 is obtained.

[0060] During the preparation process, the physical tempering temperature is 620 °C and the tempering time is 300 s; the chemical tempering temperature is 430 °C and the tempering time is 180 min.

[0061] Example 10

[0062] Example 10 is basically the same as Example 1, except that

[0063] CS = 765 Mpa, DOL = 39 μm, CT = 1.1 J. Alkaline aluminosilicate glass numbered 10 is obtained.

[0064] During the preparation process, the physical tempering temperature is 620 °C and the tempering time is 300 s; the chemical tempering temperature is 430 °C and the tempering time is 180 min.

[0065] Example 11

[0066] Example 11 is basically the same as Example 1, except that

[0067] CS = 761 Mpa, DOL = 36 μm, CT = 1.0 J. Alkaline aluminosilicate glass numbered 11 is obtained.

[0068] During the preparation process, the physical tempering temperature is 610 °C and the tempering time is 380 s; the chemical tempering temperature is 420 °C and the tempering time is 210 min.

[0069] Example 12

[0070] Example 12 is basically the same as Example 1, except that

[0071] CS = 750 Mpa, DOL = 35 μm, CT = 0.8 J. Alkaline aluminosilicate glass numbered 12 is obtained.

[0072] During the preparation process, the physical tempering temperature is 610 °C and the tempering time is 380 s; the chemical tempering temperature is 430 °C and the tempering time is 180 min.

[0073] Example 13

[0074] Example 13 is basically the same as Example 1, except that

[0075] CS = 761 Mpa, DOL = 38 μm, CT = 0.85 J. Alkaline aluminosilicate glass numbered 13 is obtained.

[0076] During the preparation process, the physical tempering temperature is 610 °C and the tempering time is 380 s; the chemical tempering temperature is 410 °C and the tempering time is 300 min.

[0077] Example 14

[0078] Example 14 is basically the same as Example 1, except that

[0079] CS = 785 Mpa, DOL = 37 μm, CT = 1.0 J. Alkaline aluminosilicate glass numbered 14 is obtained.

[0080] During the preparation process, the physical tempering temperature is 680 °C and the tempering time is 180 s; the chemical tempering temperature is 420 °C and the tempering time is 210 min.

[0081] Example 15

[0082] Example 15 is basically the same as Example 1, except that

[0083] CS = 778 Mpa, DOL = 36 μm, CT = 1.1 J. Alkaline aluminosilicate glass numbered 15 is obtained.

[0084] During the preparation process, the physical tempering temperature is 680 °C and the tempering time is 180 s; the chemical tempering temperature is 430 °C and the tempering time is 180 min.

[0085] Comparative Example 1

[0086] Comparative Example 1 is basically the same as Example 1, except that

[0087] CS = 890 Mpa, DOL = 42 μm, CT = 1.1 J. Alkaline aluminosilicate glass numbered 16 is obtained.

[0088] During the preparation process, the step of physical tempering is omitted; the chemical tempering temperature is 420 °C and the tempering time is 300 min.

[0089] Comparative Example 2

[0090] Comparative Example 2 is basically the same as Example 1, except that

[0091] CS = 140 Mpa, DOL cannot be detected, CT = 0.3 J. Alkaline aluminosilicate glass numbered 17 is obtained.

[0092] During the preparation process, the step of chemical tempering is omitted; the physical tempering temperature is 620 °C and the tempering time is 180 s.

[0093] Comparative Example 3

[0094] Comparative Example 3 is basically the same as Example 1, except that

[0095] CS = 780 Mpa, DOL = 38 Mpa, CT = 0.9 J. Alkaline aluminosilicate glass numbered 18 is obtained.

[0096] During the preparation process, the physical tempering temperature is 620 °C and the tempering time is 300 s; the chemical tempering temperature is 450 °C and the tempering time is 300 min.

[0097] Comparative Example 4

[0098] Comparative Example 4 is basically the same as Example 1, except that

[0099] An alkaline aluminosilicate glass, comprising raw materials and their mass percentages as follows: 62.52% of SiO2, 15.17% of Al2O3, 14.1% of Na2O, 5.83% of K2O, 1.62% of MgO, 0.78% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 776 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 35 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 0.7 J. The alkaline aluminosilicate glass numbered 19 is obtained.

[0100] Comparative Example 5

[0101] Comparative Example 5 is basically the same as Example 1, except that

[0102] An alkaline aluminosilicate glass, comprising raw materials and their mass percentages as follows: 60.53% of SiO2, 13.41% of Al2O3, 12.41% of Na2O, 5.34% of K2O, 7.55% of MgO, 0.76% of ZrO2; and, the compressive stress of the glass is CS, where CS satisfies: CS = 835 Mpa; the depth of the compressive stress layer of the glass is DOL, where DOL satisfies: DOL = 45 μm; the impact resistance energy of the glass is CT, where CT satisfies: CT = 1.1 J. The alkaline aluminosilicate glass numbered 20 is obtained.

[0103] In addition, the alkaline aluminosilicate glass specimens can be prepared by the following method:

[0104] The ingredients can be proportioned according to the ratio described in Table 1, the mixed materials are put into a sealed bag, mixed evenly in the sealed bag, and then poured into a platinum crucible for melting at 1550 - 1650 °C. The molten glass liquid is poured into a metal mold, and the glass together with the metal mold is put into an annealing furnace for annealing and cooling. The glass plate is processed into alkaline aluminosilicate glass specimens of 145 mm x 73 mm x 1.1 mm and 300 mm * 300 mm * 1.1 mm.

[0105] Performance Test

[0106] The alkaline aluminosilicate glasses of Examples 1-15 and Comparative Examples 1-5 were subjected to CS, DOL, 4PB, and ball drop tests. Among them, the ball drop test conditions were: a 132 g steel ball, a base height of 15 cm, a gradient of 5 cm, 3 times / height, until broken. See Table 1 for each example, comparative example, and their test results.

[0107] Table 1. Examples and Performance Test Results

[0108]

[0109]

[0110] Combined with the examples, comparative examples, and Table 1, it can be seen that for the glasses in Examples 1 to 15 prepared by the technical solution of the present invention, their impact resistance and glass breakage state meet the automotive glass safety standards. Compared with Example 1 of the present invention, Comparative Example 1 only has chemical tempering and no physical tempering. Although its impact resistance is relatively high, when it breaks, the glass is in strips and does not have safety performance; compared with Example 1 of the present invention, Comparative Example 2 only has physical tempering and no chemical tempering, and the CS on the glass surface is relatively shallow, and the impact resistance is relatively low; compared with Example 1 of the present invention, Comparative Example 3 has both physical and chemical tempering, but its breakage state still shows strips and the safety performance is relatively low. In Comparative Example 4, the magnesium oxide content is relatively low, and in Comparative Example 5, the magnesium oxide content is relatively low, both of which will result in relatively low safety performance of the glass.

[0111] A method for strengthening an alkaline aluminosilicate glass proposed by the present invention, through two-step strengthening, namely physical tempering and chemical tempering, enables the glass particles generated when the glass is broken by a heavy blow to be obtuse angles and not to hurt people, and maintains relatively high impact resistance, meeting the national requirements for automotive glass safety. The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solution of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

[0112] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0113] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An alkaline aluminosilicate glass, characterized in that, It is composed of raw materials with the following mass percentages: 58 - 65% of SiO2, 13 - 15% of Al2O3, 12 - 15% of Na2O, 0 - 6% of K2O, 3 - 5% of magnesium oxide, and 0 - 1% of ZrO2; and, The compressive stress of the glass is CS, where CS satisfies: 700 Mpa ≤ CS ≤ 800 Mpa; The depth of the compressive stress layer of the glass is DOL, where DOL satisfies: 30 μm ≤ DOL ≤ 40 μm; The impact resistance energy of the glass is CT, where CT satisfies: CT ≥ 0.8 J; The alkaline aluminosilicate glass is obtained through the following preparation process, which includes physical tempering and chemical tempering of the alkaline aluminosilicate glass sample to obtain the alkaline aluminosilicate glass. The temperature of the physical tempering is 620 - 780 °C, and the time is 180 - 300 s; and the temperature of the chemical tempering is 400 - 420 °C, and the time is 120 - 210 min; In the step of the chemical tempering treatment, a tempering salt is added, and the tempering salt is potassium nitrate; The thickness of the alkaline aluminosilicate glass sample ≥ 1.1 mm.

2. The alkaline aluminosilicate glass according to claim 1, wherein, The preparation process further includes the following steps: Step 1: Physically temper the cleaned and preheated alkaline aluminosilicate glass sample, and then cool it; Step 2: Secondarily clean and preheat the alkaline aluminosilicate glass sample treated in Step 1; Step 3: Chemically temper the alkaline aluminosilicate glass sample obtained in Step 2 to form a silicate glass product.

3. The alkaline aluminosilicate glass according to claim 2, wherein In Step 1, the pressure during cooling is 8000 - 12000 pa, and the time is 30 - 60 s; and In Step 2, the preheating temperature is 350 - 380 °C, and the preheating time is 30 - 60 min.

4. An alkaline aluminosilicate glass according to any one of claims 1-3, characterized in that, Apply the glass to automotive windows.

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