A method of increasing the glass strengthening intensity

Abstract

The application provides a method for increasing the strengthening intensity of glass, which comprises the following steps: subjecting glass to a tempering treatment to obtain strengthened glass, wherein the components of the glass include the following: the mass of SiO2 is 74-76%, the mass of CaO is 7-8%, the mass of the mixture of K2O and Na2O is 13.5-13.6%, the mass of MgO is 3.1-3.2%, the mass of Fe2O3 is <=0.1%, the mass of Al2O3 is 1.1-1.2%, the mass of ZrO2 is <0.1%, the mass of TiO2 is 0.02-0.03%, the mass of As2O3 is <0.01%, and the mass of SnS is <0.1%, wherein the total mass of the components of the glass is 100%. The tempering treatment is performed at a temperature of 640-695 DEG C for 160-180 s. In the application, the glass with specific components is subjected to the tempering treatment, and the tempering temperature and time are reasonably controlled, so that the glass is more uniformly tempered, and the stress value data are uniformly distributed. The application increases the strengthening intensity and reduces the risk of self-explosion. The obtained glass is more transparent, the transmittance is improved, and the application is suitable for industrial promotion.

Description

Technical Field

[0001] This invention belongs to the field of glass manufacturing technology and relates to a method for increasing the strength of tempered glass. Background Technology

[0002] Tempered glass is a type of safety glass and also a prestressed glass. To improve the strength of ordinary glass, chemical or physical methods are typically used to support the glass, creating compressive stress on the glass surface. When the glass is subjected to external force, this surface stress is first offset, thereby increasing its load-bearing capacity and enhancing its resistance to wind pressure, temperature changes, and impacts. Tempered glass is several times stronger than ordinary glass and has bending resistance, but it is very fragile at the edges and corners. Tempered glass has excellent stability and can withstand temperature differences three times greater than ordinary glass, up to 200°C. It is widely used in high-rise building doors and windows, glass curtain walls, interior partitions, skylights, sightseeing elevators, and glass railings.

[0003] Physically tempered glass, also known as quenched tempered glass, works by heating the glass to a suitable temperature, allowing it to eliminate internal stress through deformation. The glass is then removed from the furnace and rapidly cooled, causing the surface to contract sharply, generating compressive stress. Meanwhile, the middle layer of the glass cools more slowly and does not have time to contract, thus creating tensile stress. This process gives the glass higher strength, achieving the tempering process. Generally, the higher the cooling intensity, the greater the glass strength.

[0004] CN105036563A discloses a method for tempering perforated glass, including pretreatment, loading, heating, forming, and cooling. When the glass plate is placed on the upper section, a torch is used to spray a flame of hydrocarbon industrial fuel gas onto the through-holes of the glass plate, causing carbon powder to adhere evenly around the through-holes. This invention also provides a tempering apparatus for implementing this method, which features a simple process, convenient equipment maintenance, rapid powder spraying without affecting the original production cycle, high yield, and no impact on the appearance or quality of the glass plate.

[0005] CN112624587A discloses a horizontal roller conveyor continuous glass tempering method. The glass is carried and driven by conveyor rollers in the tempering equipment. It first enters a heating furnace and is heated until it begins to soften and reaches a target temperature before exiting the furnace. Then, it enters a tempering grid for quenching and is further cooled until fully hardened and close to room temperature, thus obtaining tempered glass. While the glass is in a softened state, i.e., from being heated in the heating furnace until it begins to soften and is cooled to harden in the tempering grid, the glass moves continuously in the same direction driven by the conveyor rollers. After being heated to the target temperature in the heating furnace, the glass exits the furnace and enters the tempering grid. From the time it enters the tempering grid until quenching is completed, its movement speed is a uniform speed of not less than 400 mm / s. This method optimizes the conveyor speed in the tempering process, improving the uniformity and flatness of the surface stress of the glass product produced by the horizontal roller conveyor continuous glass tempering method, reducing equipment costs, and minimizing the production floor space required.

[0006] CN101633568A discloses a glass tempering method in which high-temperature glass exiting a glass heating furnace is first uniformly pre-cooled using an air curtain, and then cooled and tempered into shape by a glass cooling and tempering forming mechanism. The method also discloses a glass tempering unit for implementing the above method, which has two sets of air knives symmetrically arranged on both sides of the glass conveying roller conveyor between the heating furnace and the cooling and tempering forming mechanism, used to pre-cool the passing high-temperature glass.

[0007] However, existing technologies still have problems such as excessive iron oxide content affecting glass stress value, and the tempering temperature and time are not well matched to enhance glass strength, resulting in a high probability of spontaneous glass breakage and compromised safety. Therefore, it is urgent to design and develop a new type of glass and its strengthening method to overcome the defects of existing technologies while meeting the needs of actual industrial production. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a method for increasing the strength of tempered glass. In this invention, glass with a specific composition is tempered, and the tempering temperature and time are reasonably controlled to make the glass tempered more uniformly, which is visually reflected in the uniformity of stress value data; it also increases the tempering strength and reduces the risk of spontaneous breakage; the resulting glass is more transparent, with increased transmittance, making it suitable for industrial promotion.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This invention provides a method for increasing the strength of tempered glass, the method comprising the following steps:

[0011] The glass is tempered to obtain reinforced glass;

[0012] Wherein, based on the total mass of the glass components being 100%, the glass components include:

[0013] The SiO2 mass is 74-76%, for example, it can be 74%, 74.2%, 74.4%, 74.6%, 74.8%, 75%, 75.2%, 75.4%, 75.6%, 75.8%, 76%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0014] The mass of CaO is 7-8%, for example, it can be 7%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, or 8%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] The mass of the mixture of K2O and Na2O is 13.5% to 13.6%, for example, it can be 13.5%, 13.51%, 13.52%, 13.53%, 13.54%, 13.55%, 13.56%, 13.57%, 13.58%, 13.59%, or 13.6%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0016] The mass content of MgO is 3.1% to 3.2%, for example, it can be 3.1%, 3.11%, 3.12%, 3.13%, 3.14%, 3.15%, 3.16%, 3.17%, 3.18%, 3.19%, or 3.2%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0017] The mass of Fe2O3 is ≤0.1%, for example, it can be 0.1%, 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02%, or 0.01%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable. The mass of Fe2O3 cannot be 0, because it is an essential component of glass. This application achieves better strength in the tempering of glass by controlling the mass of Fe2O3 in the glass to be ≤0.1%.

[0018] The mass of Al2O3 is 1.1% to 1.2%, for example, it can be 1.1%, 1.11%, 1.12%, 1.13%, 1.14%, 1.15%, 1.16%, 1.17%, 1.18%, 1.19%, or 1.2%, but it is not limited to the listed values. Other unlisted values ​​within this range also apply.

[0019] The mass of ZrO2 is <0.1%, for example, it can be 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02%, or 0.01%, but it is not limited to the listed values. Other unlisted values ​​within this range also apply. The mass of ZrO2 cannot be 0, because it is an essential component of glass.

[0020] The mass of TiO2 is 0.02% to 0.03%, for example, it can be 0.02%, 0.022%, 0.024%, 0.026%, 0.028%, or 0.03%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0021] The mass of As2O3 is <0.01%, for example, it can be 0.009%, 0.008%, 0.007%, 0.006%, 0.005%, 0.004%, 0.003%, 0.002%, or 0.001%, but it is not limited to the listed values. Other unlisted values ​​within this range also apply. The mass of As2O3 cannot be 0, because it is an essential component of glass.

[0022] The mass of SnS is <0.1%, for example, it can be 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02%, or 0.01%, but it is not limited to the listed values. Other unlisted values ​​within this range also apply. The mass of SnS cannot be 0, because it is an essential component of glass.

[0023] The tempering temperature is 640 to 695°C, for example, it can be 640°C, 645°C, 650°C, 655°C, 660°C, 665°C, 670°C, 675°C, 680°C, 685°C, 690°C, or 695°C, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0024] The tempering time is 160 to 180 seconds, for example, it can be 160 seconds, 162 seconds, 164 seconds, 166 seconds, 168 seconds, 170 seconds, 172 seconds, 174 seconds, 176 seconds, 178 seconds, or 180 seconds, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] This invention specifically limits the tempering process temperature to 640–695°C and the tempering time to 160–180 seconds. This is because within this limited range, the stress after tempering the glass can be uniform and between 110–130 MPa. Without the limited operation of this invention, the stress would be uneven and the best tempering effect would not be achieved. This is because the glass tempered at different temperatures and times will have very different effects.

[0026] In this invention, glass with a specific composition is tempered, and the tempering temperature and time are reasonably controlled to make the glass tempered more uniformly, which is visually reflected in uniform stress values; it also increases tempering strength and reduces the risk of spontaneous breakage; the resulting glass is more transparent, with increased transmittance, making it suitable for industrial application. The reason for controlling the quality of iron oxide is that if the iron oxide quality is too high, it will cause different heat absorption and cooling rates between iron oxide (Fe2O3) and silicon dioxide (SiO2) at the aforementioned tempering temperature and time, resulting in uneven tempering of the same glass sheet and a large stress difference.

[0027] As a preferred technical solution of the present invention, the stress value of the strengthened glass is 110-130 MPa, for example, it can be 110 MPa, 112 MPa, 114 MPa, 116 MPa, 118 MPa, 120 MPa, 122 MPa, 124 MPa, 126 MPa, 128 MPa, or 130 MPa, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0028] It should be noted that the stress value of the glass in this invention specifically refers to the stress generated on the surface and in the center of the glass when it is rapidly cooled from a high temperature, due to the different cooling rates at the surface and center. The surface stress is compressive stress, and the center stress is tensile stress. This invention tests the surface compressive stress. When the glass is subjected to external force, the surface stress is first offset, thereby improving its load-bearing capacity and enhancing its resistance to wind pressure, temperature changes, and impact.

[0029] Preferably, the uniformity of the strengthened glass is <10MPa, for example, it can be 9.9MPa, 9.8MPa, 9MPa, 8MPa, 7MPa, 6MPa, 5MPa, 4MPa, 3MPa, 2MPa, or 1MPa, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] It should be noted that, in this invention, the uniformity of glass is specifically interpreted as the small difference in the values ​​measured at different locations on the same piece of glass.

[0031] In this invention, the stress value of the glass is directly proportional to the uniformity of the glass, and the two are also directly proportional to the relative strength of the glass. That is, the greater the stress value of the glass, the higher the uniformity of the glass, and correspondingly, the greater the strength of the glass. For example, the method for measuring the stress value of the glass in this invention is as follows: select evenly distributed test points in the middle and around the glass. The number of test points is generally 5 to 10, for example, 5, 6, 7, 8, 9, 10, etc., and perform stress testing on each test point. The specific testing process is as follows: with the tin side of the glass facing up, take 9 points as test positions, namely (1) the four corners 100-200mm away from the long side and the short side respectively, (2) the middle 100-200mm away from the long side, and (3) the center position, that is, all test points are 100-200mm away from the edge.

[0032] As a preferred embodiment of the present invention, the method further includes pretreatment before tempering the glass.

[0033] As a preferred technical solution of the present invention, the pretreatment includes sequentially performing forming and cleaning processes on the glass.

[0034] As a preferred technical solution of the present invention, the molding process is mechanical processing.

[0035] Preferably, the machining is grinding.

[0036] It should be noted that the present invention does not impose specific requirements or special limitations on the specific method used in the molding process. The role of the molding process in the present invention is to obtain the target glass shape, which may be grinding or cutting. Therefore, it is understood that other molding methods that can achieve this function can be used in the present invention. Those skilled in the art can make adaptive adjustments to the specific method used in the molding process according to the usage scenario and testing conditions.

[0037] As a preferred technical solution of the present invention, the cleaning process specifically includes: using a method of venting water from both the top and bottom of the glass being processed, while simultaneously using a cleaning tool to remove debris from the surface of the glass being processed.

[0038] Preferably, the cleaning component is a brush.

[0039] As a preferred technical solution of the present invention, the cleaning process takes 3 to 4 minutes, for example, 3 minutes, 3.1 minutes, 3.2 minutes, 3.3 minutes, 3.4 minutes, 3.5 minutes, 3.6 minutes, 3.7 minutes, 3.8 minutes, 3.9 minutes, or 4 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0040] As a preferred embodiment of the present invention, the cleaning process uses pure water for cleaning.

[0041] It should be noted that the pure water in this invention refers to H2O without impurities, which is common knowledge to those skilled in the art.

[0042] As a preferred embodiment of the present invention, the tempering process is carried out in a tempering furnace.

[0043] Preferably, the intermediate temperature of the tempering furnace used in the tempering process is greater than the temperatures at both ends of the tempering furnace.

[0044] Preferably, the temperature difference between the intermediate temperature of the tempering furnace and the temperatures at both ends of the tempering furnace is 3 to 8°C.

[0045] It should be noted that the glass is placed in the middle of the conveyor rollers from the tempering furnace inlet. The rollers rotate and move the glass forward until it comes out of the outlet. To ensure that the glass is heated as evenly as possible on both sides, the glass is placed as centrally as possible.

[0046] This invention specifically limits the intermediate temperature of the tempering furnace used in the tempering process to be greater than the temperatures at both ends of the tempering furnace, and the temperature difference between the intermediate temperature and the temperatures at both ends of the tempering furnace is 3 to 8°C. This is because within this limited range of operation, the glass surface can be heated evenly. If the operation is not limited by this invention, the temperature at which heat reaches the glass surface will be uneven. This is because as the temperature rises, the edges of the glass soften more easily. Therefore, when heating the furnace, the intermediate temperature is increased to make the glass soften as evenly as possible.

[0047] As a preferred embodiment of the present invention, the glass is cooled after tempering.

[0048] Preferably, the cooling method is air cooling.

[0049] Preferably, the cooling air pressure of the air-cooled system is 80-85%.

[0050] It should be noted that the cooling method in this invention is air cooling, but other cooling methods, such as water cooling, are not excluded. Furthermore, the cooling air pressure of 80-85% in this invention refers to the percentage of the cooling air being turned on being 80-85%. This invention limits the cooling air pressure to 80-85% because within this range, the glass can be cooled rapidly. If it is outside this range, the tempering effect will be poor, because the stress value on the glass surface is mainly generated during the cooling process after heating.

[0051] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] In this invention, glass with a specific composition is tempered, and the tempering temperature and time are reasonably controlled, so that the glass is tempered more uniformly, which is directly reflected in the uniform stress value data; it also increases the tempering strength and reduces the risk of spontaneous breakage; the resulting glass is more transparent and has a higher transmittance, making it suitable for industrial promotion. Detailed Implementation

[0054] It should be understood that in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown on the paper page. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0057] In one specific embodiment, the present invention provides a method for increasing the strength of tempered glass, the method comprising the following steps:

[0058] The glass is tempered to obtain reinforced glass;

[0059] Wherein, based on the total mass of the glass components being 100%, the glass components include:

[0060] The mass percentages are as follows: SiO2 74–76%, CaO 7–8%, K2O + Na2O 13.5–13.6%, MgO 3.1–3.2%, Fe2O3 ≤0.1%, Al2O3 1.1–1.2%, ZrO2 <0.1%, TiO2 0.02–0.03%, As2O3 <0.01%, and SnS <0.1%.

[0061] The tempering temperature is 640–695℃, and the tempering time is 160–180 seconds.

[0062] In this invention, glass with a specific composition is tempered, and the tempering temperature and time are reasonably controlled, so that the glass is tempered more uniformly, which is directly reflected in the uniform stress value data; it also increases the tempering strength and reduces the risk of spontaneous breakage; the resulting glass is more transparent and has a higher transmittance, making it suitable for industrial promotion.

[0063] Furthermore, the stress value of the glass is 110–130 MPa, and the uniformity of the glass is <10 MPa.

[0064] The method further includes pretreatment before tempering the glass, and the pretreatment includes sequentially forming and cleaning the glass.

[0065] The forming process is mechanical forming, specifically grinding. It should be noted that this invention does not impose specific requirements or limitations on the particular method used in the forming process. The purpose of the forming process in this invention is to obtain the target glass shape, which can be grinding or cutting. Therefore, it is understood that other forming methods capable of achieving this function can be used in this invention. Those skilled in the art can adaptively adjust the specific method used in the forming process according to the usage scenario and testing conditions.

[0066] The cleaning process specifically includes: applying water to both the top and bottom of the glass being processed, while simultaneously using a cleaning tool to remove debris from the surface of the glass. Specifically, the cleaning tool is a brush. The cleaning process takes 3-4 minutes and uses pure water. It should be noted that in this invention, pure water refers to H2O free of impurities, a fact well-known to those skilled in the art.

[0067] The tempering process is carried out in a tempering furnace. The temperature in the middle of the tempering furnace is higher than the temperature at both ends of the furnace. The temperature difference between the middle temperature and the temperature at both ends of the tempering furnace is 3-8°C. After the glass tempering process, it is cooled by air cooling. The cooling air pressure is 80-85%. It should be noted that the cooling air pressure of 80-85% in this invention refers to the proportion of cooling air being turned on being 80-85%.

[0068] Example 1

[0069] This embodiment provides a method for increasing the strength of tempered glass, as detailed below:

[0070] The glass is tempered to obtain reinforced glass;

[0071] Wherein, based on the total mass of the glass components being 100%, the glass components include:

[0072] The mass percentages are as follows: SiO2 74%, CaO 7%, a mixture of K2O and Na2O 13.5%, MgO 3.1%, Fe2O3 0.1%, Al2O3 1.1%, ZrO2 0.09%, TiO2 0.02%, As2O3 0.009%, and SnS 0.09%.

[0073] The tempering temperature is 640℃ and the tempering time is 180s.

[0074] The method further includes pretreatment before tempering the glass, and the pretreatment includes sequentially forming and cleaning the glass.

[0075] The forming process is machining, specifically grinding. The cleaning process includes: applying water to both the top and bottom of the glass being processed, while simultaneously using a cleaning tool (a brush) to remove debris from the surface of the glass. The cleaning process takes 3 minutes and uses pure water.

[0076] The tempering process is carried out in a tempering furnace. The temperature in the middle of the tempering furnace is higher than the temperature at both ends of the furnace. The temperature difference between the middle temperature and the temperature at both ends of the tempering furnace is 3℃. After tempering, the glass is cooled by air cooling with a cooling air pressure of 85%.

[0077] Example 2

[0078] This embodiment provides a method for increasing the strength of tempered glass, as detailed below:

[0079] The glass is tempered to obtain reinforced glass;

[0080] Wherein, based on the total mass of the glass components being 100%, the glass components include:

[0081] The composition of SiO2 is 75% by mass, CaO is 7.5% by mass, the mixture of K2O and Na2O is 13.55% by mass, MgO is 3.15% by mass, Fe2O3 is 0.08% by mass, Al2O3 is 1.15% by mass, ZrO2 is 0.08% by mass, TiO2 is 0.026% by mass, As2O3 is 0.008% by mass, and SnS is 0.07% by mass.

[0082] The tempering temperature is 670℃ and the tempering time is 170s.

[0083] The method further includes pretreatment before tempering the glass, and the pretreatment includes sequentially forming and cleaning the glass.

[0084] The forming process is mechanical forming, which involves grinding. The cleaning process specifically includes: applying water to both the top and bottom of the glass being processed, while simultaneously using a cleaning tool, specifically a brush, to remove debris from the surface of the glass. The cleaning process takes 3.5 minutes and uses pure water.

[0085] The tempering process is carried out in a tempering furnace. The temperature in the middle of the tempering furnace is higher than the temperature at both ends of the tempering furnace. The temperature difference between the middle temperature and the temperature at both ends of the tempering furnace is 5℃. After tempering, the glass is cooled by air cooling with a cooling air pressure of 83%.

[0086] Example 3

[0087] This embodiment provides a method for increasing the strength of tempered glass, as detailed below:

[0088] The glass is tempered to obtain reinforced glass;

[0089] Wherein, based on the total mass of the glass components being 100%, the glass components include:

[0090] The mass percentages are as follows: SiO2 76%, CaO 8%, a mixture of K2O and Na2O 13.6%, MgO 3.2%, Fe2O3 0.05%, Al2O3 1.2%, ZrO2 0.03%, TiO2 0.03%, As2O3 0.005%, and SnS 0.04%.

[0091] Methods for strengthening glass include:

[0092] The tempering temperature is 695℃ and the tempering time is 160s.

[0093] The method further includes pretreatment before tempering the glass, and the pretreatment includes sequentially forming and cleaning the glass.

[0094] The forming process is mechanical forming, which involves grinding. The cleaning process specifically includes: water being sprayed from both the top and bottom of the glass being processed, while simultaneously using a cleaning tool, specifically a brush, to remove debris from the surface of the glass. The cleaning process takes 4 minutes and uses pure water.

[0095] The tempering process is carried out in a tempering furnace. The temperature in the middle of the tempering furnace is higher than the temperature at both ends of the furnace. The temperature difference between the middle temperature and the temperature at both ends of the tempering furnace is 8°C. After tempering, the glass is cooled by air cooling with a cooling air pressure of 80%.

[0096] Example 4

[0097] Compared with Example 1, the difference in this embodiment is that the temperature difference between the middle temperature and the two ends of the tempering furnace is 2°C. All other parameters and methods are exactly the same as in Example 1.

[0098] Example 5

[0099] Compared with Example 1, the difference in this embodiment is that the temperature difference between the middle temperature and the two ends of the tempering furnace is 9°C. All other parameters and methods are exactly the same as in Example 1.

[0100] Example 6

[0101] Compared with Example 1, the difference in this embodiment is that there is no temperature difference between the middle temperature and the two ends of the tempering furnace, while the other parameters and methods are exactly the same as in Example 1.

[0102] Example 7

[0103] Compared with Example 1, the difference in this embodiment is that the cooling air pressure during the tempering process is 78%, while the other parameters and methods are exactly the same as in Example 1.

[0104] Example 8

[0105] Compared with Example 1, the difference in this embodiment is that the cooling air pressure during the tempering process is 88%, while the other parameters and methods are exactly the same as in Example 1.

[0106] Comparative Example 1

[0107] The difference between this comparative example and Example 1 is that the mass of Fe2O3 is 0.12%, while the other parameters and methods are exactly the same as in Example 1.

[0108] Comparative Example 2

[0109] The difference between this comparative example and Example 1 is that the mass of Fe2O3 is 0.2%, while all other parameters and methods are exactly the same as in Example 1.

[0110] Comparative Example 3

[0111] The difference between this comparative example and Example 1 is that the tempering process temperature is 635°C, while the other parameters and methods are exactly the same as in Example 1.

[0112] Comparative Example 4

[0113] The difference between this comparative example and Example 1 is that the tempering temperature is 698°C, while the other parameters and methods are exactly the same as in Example 1.

[0114] Comparative Example 5

[0115] The difference between this comparative example and Example 1 is that the tempering process takes 155 seconds, while all other parameters and methods are exactly the same as in Example 1.

[0116] Comparative Example 6

[0117] The difference between this comparative example and Example 1 is that the tempering process takes 185 seconds, while all other parameters and methods are exactly the same as in Example 1.

[0118] The strengthened glass prepared in the above embodiments was subjected to re-cleaning, printing, spraying, inspection, and packaging, followed by stress value testing, as detailed below:

[0119] In this invention, the stress value of the glass is directly proportional to the uniformity of the glass, and the two are also directly proportional to the relative strength of the glass. That is, the greater the stress value of the glass, the higher the uniformity of the glass, and correspondingly, the greater the strength of the glass. For example, the method for measuring the stress value of the glass in this invention is as follows: select evenly distributed test points in the middle and around the glass. The number of test points is generally 5 to 10, for example, 5, 6, 7, 8, 9, 10, etc., and perform stress testing on each test point. The specific testing process is as follows: with the tin side of the glass facing up, take 9 points as test positions, namely (1) the four corners 100-200mm away from the long side and the short side respectively, (2) the middle 100-200mm away from the long side, and (3) the center position, that is, all test points are 100-200mm away from the edge.

[0120] Table 1. Average stress values ​​of the glass prepared in each embodiment.

[0121]

[0122]

[0123] As shown in Table 1:

[0124] A comparison of Examples 1-3 and Examples 4-10 shows that this application, by specifying the specific composition of the glass and the specific operating parameters for glass strengthening, enables the stress value of the glass to be between 110-130 MPa, resulting in good uniformity of the strengthened glass.

[0125] By comparing Examples 1 and 4, 5 and 6, it can be seen that this application limits the temperature difference between the middle temperature and the two ends of the tempering furnace to 3-8°C, so that the stress value of the glass is between 110-130MPa and the glass surface is heated evenly. If it is not within the limits of this invention, the temperature of the heat reaching the glass surface will be uneven. This is because the glass softens more easily around the edges as the temperature rises. Therefore, when heating the furnace, the middle temperature is increased to make the glass soften as evenly as possible.

[0126] By comparing Examples 1 and 7 and 8, it can be seen that this application limits the cooling air pressure of the tempering process to 80-85%, which enables the glass to cool down quickly. If it is not within the limits of this invention, the tempering effect will be poor. This is because the stress value on the glass surface is mainly generated when it is cooled after heating.

[0127] By comparing Example 1 and Comparative Examples 1 and 2, it can be seen that by limiting the mass of Fe2O3 in the glass to ≤0.1%, the stress value of the glass is stabilized. If the mass of iron oxide is too high, it will cause the iron oxide Fe2O3 and silicon dioxide SiO2 to have different heat absorption and cooling rates at the above-mentioned tempering temperature and time, resulting in uneven tempering effect and large stress difference in the same piece of glass.

[0128] By comparing Example 1 and Comparative Examples 3 and 4, it can be seen that this application limits the tempering process temperature to 640-695°C, so that the glass surface is heated evenly. If it is not within the limits of this invention, the temperature of the heat reaching the glass surface will be uneven. This is because the glass softens more easily around the edges as the temperature rises. Therefore, when heating in the furnace, the intermediate temperature is increased to make the glass soften as evenly as possible.

[0129] By comparing Example 1 and Comparative Examples 5 and 6, it can be seen that by limiting the tempering process time to 160-180s, the stress of the tempered glass is uniform and between 110-130MPa. If the operation is not limited by the present invention, the stress will be uneven and the best tempering effect will not be achieved. This is because the glass tempered at different temperatures and times will have very different effects.

[0130] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0131] The present invention has been illustrated with the above embodiments to explain the detailed method of the present invention. However, the present invention is not limited to the detailed method described above, that is, it does not mean that the present invention must rely on the detailed method described above to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for increasing the strength of tempered glass, characterized in that, The method includes the following steps: The glass is tempered to obtain reinforced glass; The total mass percentage of the glass component is 100%, and the glass component includes: SiO2 74~76%; CaO 7~8%; A mixture of K2O and Na2O, 13.5% to 13.6%; MgO 3.1~3.2%; Fe2O3 ≤ 0.1% and not 0; Al2O3 1.1~1.2%; ZrO2 < 0.1%; TiO2 0.02~0.03%; As2O3 < 0.01% and not 0; SnS < 0.1% and is not 0; The tempering temperature is 640~695℃, and the tempering time is 160~180s.

2. The method according to claim 1, characterized in that, The surface compressive stress value of the strengthened glass is 110~130MPa.

3. The method according to claim 1, characterized in that, The uniformity of the strengthened glass is <10 MPa.

4. The method according to claim 1, characterized in that, The method further includes pretreatment before tempering the glass.

5. The method according to claim 4, characterized in that, The pretreatment includes sequentially shaping and cleaning the glass.

6. The method according to claim 5, characterized in that, The forming process is mechanical processing.

7. The method according to claim 6, characterized in that, The machining process is grinding.

8. The method according to claim 5, characterized in that, The cleaning process specifically includes: using a method where water is discharged from both the top and bottom of the glass to be processed, while simultaneously using a cleaning tool to remove debris from the surface of the glass to be processed.

9. The method according to claim 8, characterized in that, The cleaning component is a brush.

10. The method according to claim 5, characterized in that, The cleaning process takes 3 to 4 minutes.

11. The method according to claim 5, characterized in that, The cleaning process uses pure water.

12. The method according to claim 1, characterized in that, The tempering process is carried out in a tempering furnace.

13. The method according to claim 12, characterized in that, The intermediate temperature of the tempering furnace used in the tempering process is higher than the temperatures at both ends of the tempering furnace.

14. The method according to claim 13, characterized in that, The temperature difference between the middle temperature and the two ends of the tempering furnace is 3~8℃.

15. The method according to claim 1, characterized in that, The glass is cooled after tempering.

16. The method according to claim 15, characterized in that, The cooling method is air cooling.

17. The method according to claim 16, characterized in that, When using air cooling, the cooling fan is turned on 80-85% of the time.

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