A method for tempering a triple-silver low-e glass and a tempered triple-silver low-e glass

Abstract

The present application relates to the technical field of glass, especially to the field of IPC C03B27, further to a kind of silver LOW-E glass and the method for toughening silver LOW-E glass.The method comprises the following steps: (1) pretreatment: silver LOW-E glass is cut, edge is ground and is cleaned treatment;(2) heating treatment: the silver LOW-E glass after pretreatment is sent into double room convection toughening furnace by roller and is heated;(3) cooling treatment: the silver LOW-E glass after heating is transferred from heating zone to air cooling zone and is cooled;(4) piece is sent out and is framed: the silver LOW-E glass after cooling is sent out double room convection toughening furnace and is framed, and the silver LOW-E glass is obtained.The technical scheme of the present application greatly shortens the toughening time, and the silver LOW-E glass obtained has excellent optical performance and mechanical strength.

Description

Technical Field

[0001] This invention relates to the field of glass technology, particularly to the field of IPC C03B27, and further to a method for tempering triple silver LOW-E glass and tempered triple silver LOW-E glass. Background Technology

[0002] In recent years, with the transformation of people's thinking and design concepts, the application of glass in the construction field has become increasingly common. However, the use of glass windows or glass curtain walls is not conducive to the implementation of energy conservation and emission reduction policies due to the inherent properties of glass itself. Therefore, energy-saving glass has also been developed. Among them, triple-silver Low-E (low-emissivity) glass has broad application prospects due to its low emissivity and high reflectivity to infrared radiation. However, currently, because triple-silver Low-E glass, which requires tempering, often fails to meet product quality requirements, its widespread use in China has not yet been fully promoted.

[0003] Chinese patent CN202011043190 discloses a tempered coated glass and its tempering method. In the tempering process, the pre-treated coated glass is fed into a convection tempering furnace via roller conveyors for high-temperature heating. This furnace may contain a preheating section, a heating section, and an annealing section sequentially. The preheating section has a temperature of 300–450°C for 1–10 minutes; the heating section has a temperature of 620–720°C for 1–20 minutes; and the annealing section has a temperature of 400–650°C for 1–30 minutes. In the cooling step, the tempered coated glass is cooled, for example, by being repeatedly cooled to room temperature using an air vent. However, this method has a long tempering time and may cause problems such as glass warping. Summary of the Invention

[0004] The first aspect of this invention provides a method for tempering triple silver LOW-E glass, comprising the following steps:

[0005] (a) Pre-treatment: Cutting, edge grinding and cleaning of triple silver LOW-E glass;

[0006] (ii) Heat treatment: The pretreated triple silver LOW-E glass is fed into a double-chamber convection tempering furnace via roller conveyor for heat treatment;

[0007] (III) Cooling treatment: The heat-treated triple silver LOW-E glass is transferred from the heating zone to the air-cooling zone for cooling treatment;

[0008] (iv) Unloading and mounting: The cooled triple silver LOW-E glass is sent out of the double-chamber convection tempering furnace for unloading and mounting.

[0009] Preferably, the triple silver LOW-E glass is fed into the dual-chamber convection tempering furnace at a speed of 430–470 mm / s and discharged from the dual-chamber convection tempering furnace at a speed of 480–520 mm / s.

[0010] Preferably, the thickness of the triple silver LOW-E glass is 6 mm.

[0011] Preferably, in step (ii), the heating power of the furnace is 90-95% of the rated power of the furnace.

[0012] Preferably, in step (ii), the heating power of the lower furnace during the heating process is 80-90% of the rated power of the lower furnace.

[0013] Preferably, the heating power of the upper furnace and the heating power of the lower furnace are both 500KW.

[0014] Preferably, the heat treatment in step (ii) includes at least a first heat treatment and a second heat treatment.

[0015] Preferably, the heating treatment in step (ii) includes a first heating treatment and a second heating treatment.

[0016] Preferably, the first heating treatment is: raising the temperature from 25°C to 560-580°C and holding it at that temperature for 15-25 seconds.

[0017] Preferably, the heating period for the first heating treatment, from 25°C to 560-580°C, is 0-160 seconds.

[0018] Preferably, the second heating treatment is: raising the temperature from 560-580°C to 670-690°C and holding it at that temperature for 15-25 seconds.

[0019] Preferably, the second heating treatment, which involves raising the temperature from 560–580°C to 670–690°C, takes 180–340 seconds.

[0020] Preferably, the first heating treatment is: heating from 25°C to 570°C within a time period of 0 to 160 seconds, and holding at that temperature for 20 seconds.

[0021] Preferably, the second heating treatment is: heating from 570°C to 680°C within a time period of 180 to 340 seconds, and holding at that temperature for 20 seconds.

[0022] Preferably, the oscillation speed of the triple silver LOW-E glass during the heat treatment process includes at least three different oscillation speeds.

[0023] Preferably, the oscillation speed of the triple silver LOW-E glass during the heat treatment process includes five different oscillation speeds.

[0024] Preferably, the five different oscillation speeds are 45-55 mm / s, 75-85 mm / s, 115-125 mm / s, 170-190 mm / s, and 210-230 mm / s, respectively.

[0025] Preferably, the time periods of the five different swing speeds are 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s, respectively.

[0026] Preferably, the heating process includes at least three different convection frequencies.

[0027] Preferably, the heating process includes five different convection frequencies.

[0028] Preferably, the five different convection frequencies are respectively 40-50%, 35-45%, 30-40%, 20-30%, and 15-25% of the total convection frequency.

[0029] Preferably, the total convection frequency is 50Hz.

[0030] Preferably, the time periods of the five different convection frequencies are 0–72s, 72–144s, 144–216s, 216–288s, and 288–360s, respectively.

[0031] Generally, due to the presence of the Low-E film layer, triple-silver Low-E glass reflects some heat, which can easily lead to uneven heating on both sides, thus affecting its flatness and film performance. Existing technologies address this problem by using low-temperature, long-time methods. However, through extensive inventive experiments, the applicant has discovered that when the proposed method employs a heating process including a first heating process and a second heating process—the first heating process being a temperature increase from 25°C to 570°C within a 0–160s timeframe, followed by a 20s holding period; and the second heating process being a temperature increase from 570°C to 680°C within a 180–340s timeframe, followed by a 20s holding period—the resulting tempered triple-silver Low-E glass exhibits excellent light transmittance, shading coefficient, heat transfer coefficient, and flatness. The applicant speculates that the heating power of the upper furnace in step (II) of this application is 90-95% of the rated power of the upper furnace, and the heating power of the lower furnace in step (II) is 80-90% of the rated power of the lower furnace. This can reduce the asymmetry of heating between the LOW-E film layer and the glass surface to a certain extent. In addition, the oscillation speed of the triple silver LOW-E glass during the heating process includes 5 different oscillation speeds and 5 different convection frequencies, which can make the heating of the LOW-E film layer and the glass surface of the triple silver LOW-E glass more uniform, avoiding warping and deformation, and also avoiding cracking due to excessive difference in compressive and tensile stress. At the same time, it can also protect the LOW-E film layer of the triple silver LOW-E glass from being affected, maintaining the high light transmittance, low shading coefficient, and low heat transfer coefficient of the triple silver LOW-E glass, making it suitable for urban curtain walls, residences, public venues, and canopies.

[0032] During the experiment, the applicant further discovered that when the five different swing speeds were 45–55 mm / s, 75–85 mm / s, 115–125 mm / s, 170–190 mm / s, and 210–230 mm / s respectively, and the time periods of the five different swing speeds were 0–72 s, 72–144 s, 144–216 s, 216–288 s, and 288–360 s respectively, it could also, to a certain extent, prevent collision scratches on triple silver LOW-E glass and further improve its flatness.

[0033] When the five different convection frequencies are 40-50%, 35-45%, 30-40%, 20-30%, and 15-25% of the total convection frequency, respectively, and the time periods of the five different convection frequencies are 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s, respectively, the flatness and uniform color of the film layer can be further guaranteed.

[0034] Preferably, in step (iii), the height of the upper air vent from the surface of the triple silver LOW-E glass in the cooling process is 20-30 mm; the height of the lower air vent from the surface of the triple silver LOW-E glass is 20-30 mm.

[0035] Preferably, in step (iii), the height of the upper air vent from the surface of the triple silver LOW-E glass in the cooling process is 25mm; the height of the lower air vent from the surface of the triple silver LOW-E glass is 25mm.

[0036] Preferably, the cooling process in step (iii) includes rapid cooling and cooling treatment.

[0037] Preferably, the oscillation speed of the upper and lower air grilles during the rapid cooling process is 180-220 mm / s; the rapid cooling time is 70-90 s.

[0038] Preferably, the air pressure during the rapid cooling process is 3000-3300 MPa.

[0039] Preferably, the air pressure during the rapid cooling process is 3200 MPa.

[0040] Preferably, the oscillation speed of the upper and lower air grilles during the cooling process is 90-110 mm / s; the cooling time is 70-90 s.

[0041] During the experiment, the applicant discovered that controlling the oscillation speed of the upper and lower air grilles to 180–220 mm / s and the quenching time to 70–90 s during the rapid cooling process can improve the impact resistance of triple-silver LOW-E glass and achieve good tempering effect. The applicant further discovered that, under the above conditions, further controlling the air pressure during the rapid cooling process to 3000–3300 MPa, especially when the air pressure is 3200 MPa, can stabilize and balance the internal stress of the tempered glass, preventing excessive internal stress from causing breakage; and effectively ensuring the number of fragments.

[0042] Preferably, the air pressure during the cooling process is 1700–1900 MPa.

[0043] Preferably, the air pressure during the cooling process is 1860 MPa.

[0044] Preferably, the tempering method for triple silver LOW-E glass provided by the present invention is applicable from May to October.

[0045] Preferably, if the tempering method of triple silver LOW-E glass provided by the present invention is used in November, December, and January to March, the difference from May to October is that the total heating treatment time is increased by 5 to 10%; and the air pressure in the rapid cooling process and the cooling process is reduced by 10%.

[0046] A second aspect of the present invention provides a tempered triple silver LOW-E glass prepared by the above method.

[0047] Beneficial effects:

[0048] 1. This application employs a heat treatment method that includes a first heat treatment and a second heat treatment. The first heat treatment is: heating from 25℃ to 570℃ within a time period of 0 to 160s and holding at that temperature for 20s; the second heat treatment is: heating from 570℃ to 680℃ within a time period of 180 to 340s and holding at that temperature for 20s. The resulting tempered triple silver LOW-E glass has good light transmittance, shading coefficient, heat transfer coefficient, and flatness.

[0049] 2. When the five different swing speeds of this application are 45-55mm / s, 75-85mm / s, 115-125mm / s, 170-190mm / s, and 210-230mm / s respectively, and the time periods of the five different swing speeds are 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s respectively, it can also avoid collision scratches on triple silver LOW-E glass and further improve its flatness to a certain extent.

[0050] 3. When the five different convection frequencies are respectively 40-50%, 35-45%, 30-40%, 20-30%, and 15-25% of the total convection frequency, and the time periods of the five different convection frequencies are respectively 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s, the flatness and uniform color of the film layer can be further guaranteed.

[0051] 4. This application controls the swing speed of the upper and lower air grilles to 180-220 mm / s during the rapid cooling process; the rapid cooling time is 70-90 s; this can improve the impact resistance of triple silver LOW-E glass and has a good tempering effect.

[0052] 5. This application further controls the air pressure during the rapid cooling process to 3000-3300 MPa, especially when the air pressure during the rapid cooling process is 3200 MPa, which can further stabilize and balance the internal stress of tempered glass, prevent excessive internal stress from causing breakage, and effectively ensure the number of fragments. Attached Figure Description

[0053] Figures 1-2 The image shows a physical picture of tempered triple silver LOW-E glass obtained by the tempering method of Example 1. Detailed Implementation

[0054] Example 1

[0055] Example 1 provides a method for tempering triple silver LOW-E glass, comprising the following steps:

[0056] (a) Pre-treatment: Cutting, edge grinding and cleaning of triple silver LOW-E glass;

[0057] (ii) Heat treatment: The pretreated triple silver LOW-E glass is fed into a double-chamber convection tempering furnace via roller conveyor for heat treatment;

[0058] (III) Cooling treatment: The heat-treated triple silver LOW-E glass is transferred from the heating zone to the air-cooling zone for cooling treatment;

[0059] (iv) Unloading and mounting: The cooled triple silver LOW-E glass is sent out of the double-chamber convection tempering furnace for unloading and mounting.

[0060] The aforementioned Sanyin Low-E glass was purchased from Xinyi Glass Holdings Limited, model number: XTTG 0170.

[0061] The triple silver LOW-E glass is fed into the dual-chamber convection tempering furnace at a speed of 450 mm / s and exited the dual-chamber convection tempering furnace at a speed of 500 mm / s.

[0062] The thickness of the triple silver LOW-E glass is 6mm.

[0063] In step (ii), the heating power of the upper furnace is 95% of the rated power of the upper furnace.

[0064] In step (ii), the heating power of the lower furnace is 85% of the rated power of the lower furnace.

[0065] The heating power of the upper furnace and the lower furnace are both 500KW.

[0066] The heating treatment in step (ii) includes a first heating treatment and a second heating treatment.

[0067] The first heating treatment is as follows: the temperature is increased from 25°C to 570°C within a time period of 0 to 160 seconds, and then held for 20 seconds.

[0068] The second heating treatment is as follows: the temperature is raised from 570℃ to 680℃ within a time period of 180 to 340 seconds, and then held for 20 seconds.

[0069] The swing speed of the triple silver LOW-E glass during the heat treatment process includes 5 different swing speeds.

[0070] The five different oscillation speeds are 50mm / s, 80mm / s, 120mm / s, 180mm / s, and 220mm / s, respectively.

[0071] The time periods of the five different swing speeds are 0–72s, 72–144s, 144–216s, 216–288s, and 288–360s, respectively.

[0072] The heating process includes five different convection frequencies.

[0073] The five different convection frequencies are respectively 45%, 40%, 35%, 25%, and 20% of the total convection frequency.

[0074] The total frequency of the convection is 50 Hz.

[0075] The five different convection frequencies are 0–72s, 72–144s, 144–216s, 216–288s, and 288–360s, respectively.

[0076] In step (iii), the height of the upper air grating from the surface of the triple silver LOW-E glass in the cooling process is 25mm; the height of the lower air grating from the surface of the triple silver LOW-E glass is 25mm.

[0077] The cooling process in step (iii) includes rapid cooling and quenching.

[0078] The oscillation speed of the upper and lower air grilles during the rapid cooling process is 200 mm / s; the rapid cooling time is 80 s.

[0079] The air pressure during the rapid cooling process is 3200 MPa.

[0080] During the cooling process, the swing speed of the upper and lower air grilles is 100 mm / s; the cooling time is 80 s.

[0081] The air pressure during the cooling process is 1860 MPa.

[0082] A tempered triple silver LOW-E glass prepared by the above method.

[0083] Example 2

[0084] Example 2 provides a method for tempering triple silver LOW-E glass, comprising the following steps:

[0085] (a) Pre-treatment: Cutting, edge grinding and cleaning of triple silver LOW-E glass;

[0086] (ii) Heat treatment: The pretreated triple silver LOW-E glass is fed into a double-chamber convection tempering furnace via roller conveyor for heat treatment;

[0087] (III) Cooling treatment: The heat-treated triple silver LOW-E glass is transferred from the heating zone to the air-cooling zone for cooling treatment;

[0088] (iv) Unloading and mounting: The cooled triple silver LOW-E glass is sent out of the double-chamber convection tempering furnace for unloading and mounting.

[0089] The aforementioned Sanyin Low-E glass was purchased from Xinyi Glass Holdings Limited, model number: XTTG 0170.

[0090] The triple silver LOW-E glass is fed into the dual-chamber convection tempering furnace at a speed of 450 mm / s and exited the dual-chamber convection tempering furnace at a speed of 500 mm / s.

[0091] The thickness of the triple silver LOW-E glass is 6mm.

[0092] In step (ii), the heating power of the upper furnace is 95% of the rated power of the upper furnace.

[0093] In step (ii), the heating power of the lower furnace is 85% of the rated power of the lower furnace.

[0094] The heating power of the upper furnace and the lower furnace are both 500KW.

[0095] The heating treatment in step (ii) includes a first heating treatment and a second heating treatment.

[0096] The first heating treatment is as follows: the temperature is increased from 25°C to 570°C within a time period of 0 to 160 seconds, and then held for 20 seconds.

[0097] The second heating treatment is as follows: the temperature is raised from 570℃ to 680℃ within a time period of 180 to 340 seconds, and then held for 20 seconds.

[0098] The swing speed of the triple silver LOW-E glass during the heat treatment process includes 5 different swing speeds.

[0099] The five different oscillation speeds are 55mm / s, 85mm / s, 125mm / s, 185mm / s, and 225mm / s, respectively.

[0100] The time periods of the five different swing speeds are 0–72s, 72–144s, 144–216s, 216–288s, and 288–360s, respectively.

[0101] The heating process includes five different convection frequencies.

[0102] The five different convection frequencies are respectively 50%, 45%, 40%, 30%, and 25% of the total convection frequency.

[0103] The total frequency of the convection is 50 Hz.

[0104] The five different convection frequencies are 0–72s, 72–144s, 144–216s, 216–288s, and 288–360s, respectively.

[0105] In step (iii), the height of the upper air grating from the surface of the triple silver LOW-E glass in the cooling process is 25mm; the height of the lower air grating from the surface of the triple silver LOW-E glass is 25mm.

[0106] The cooling process in step (iii) includes rapid cooling and quenching.

[0107] The oscillation speed of the upper and lower air grilles during the rapid cooling process is 210 mm / s; the rapid cooling time is 80 s.

[0108] The air pressure during the rapid cooling process is 3200 MPa.

[0109] During the cooling process, the swing speed of the upper and lower air grilles is 100 mm / s; the cooling time is 80 s.

[0110] The air pressure during the cooling process is 1860 MPa.

[0111] A tempered triple silver LOW-E glass prepared by the above method.

[0112] Example 3

[0113] Example 3 provides a method for tempering triple silver LOW-E glass, the specific implementation of which is the same as in Example 1, except that...

[0114] The swing speed of the triple silver LOW-E glass during the first and second heat treatments includes three different swing speeds.

[0115] The three different swing speeds are 80mm / s, 120mm / s, and 180mm / s, respectively.

[0116] The time periods for the three different swing speeds are 0–120s, 120–240s, and 240–360s, respectively.

[0117] A tempered triple silver LOW-E glass prepared by the above method.

[0118] Example 4

[0119] Example 4 provides a tempering method for triple silver LOW-E glass, the specific implementation of which is the same as that of Example 1, except that the first and second heating processes include three different convection frequencies.

[0120] The three different convection frequencies are 40%, 35%, and 25% of the total convection frequency, respectively.

[0121] The three different convection frequencies are 0–120 s, 120–240 s, and 240–360 s, respectively.

[0122] A tempered triple silver LOW-E glass prepared by the above method.

[0123] Example 5

[0124] Example 5 provides a tempering method for triple silver LOW-E glass, the specific implementation of which is the same as that of Example 1, except that the oscillation speed of the upper and lower air grids in the rapid cooling process is 230 mm / s.

[0125] A tempered triple silver LOW-E glass prepared by the above method.

[0126] Example 6

[0127] Example 6 provides a tempering method for triple silver LOW-E glass, the specific implementation of which is the same as that of Example 1, except that the air pressure in the rapid cooling process is 3300MPa.

[0128] A tempered triple silver LOW-E glass prepared by the above method.

[0129] Performance testing: The tempered triple silver LOW-E glass prepared in Examples 1-6 (June) was tested as follows:

[0130] 1. Light transmittance and shading coefficient: measured using a spectrophotometer.

[0131] 2. Heat transfer coefficient: Refer to standard T / CECS 627-2019.

[0132] 3. Impact resistance, bending resistance, surface stress, and fragmentation: Refer to standard GB / T35604-2017.

[0133] Test results:

[0134]

[0135]

Claims

1. A method for tempering triple-silver LOW-E glass, characterized in that, Includes the following steps: (a) Pre-treatment: Cutting, edge grinding and cleaning of triple silver LOW-E glass; (ii) Heat treatment: The pretreated triple silver LOW-E glass is fed into a double-chamber convection tempering furnace via roller conveyor for heat treatment; (iii) Cooling treatment: The heat-treated triple silver LOW-E glass is transferred from the heating zone to the air-cooling zone for cooling treatment; (iv) Unloading and mounting: The cooled triple silver LOW-E glass is sent out of the double-chamber convection tempering furnace for unloading and mounting. During the heat treatment process, the oscillation speed of the triple silver LOW-E glass includes five different oscillation speeds; the five different oscillation speeds are 45~55 mm / s, 75~85 mm / s, 115~125 mm / s, 170~190 mm / s, and 210~230 mm / s, respectively; the time periods of the five different oscillation speeds are 0~72s, 72~144s, 144~216s, 216~288s, and 288~360s, respectively. The heating process includes five different convection frequencies; the five different convection frequencies are 40-50%, 35-45%, 30-40%, 20-30%, and 15-25% of the total convection frequency, respectively; the time periods of the five different convection frequencies are 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s, respectively. The cooling process in step (iii) includes rapid cooling and quenching. During the rapid cooling process, the oscillation speed of the upper and lower air grilles is 180~220mm / s; the rapid cooling time is 70~90s. In step (ii), the heating power of the upper furnace in the heating treatment is 90-95% of the rated power of the upper furnace, and the heating power of the lower furnace in the heating treatment in step (ii) is 80-90% of the rated power of the lower furnace. The heat treatment in step (ii) includes at least a first heat treatment and a second heat treatment; The first heating treatment is as follows: the temperature is raised from 25°C to 570°C within a time period of 0 to 160 seconds, and then held for 20 seconds. The second heating treatment is as follows: the temperature is raised from 570℃ to 680℃ within a time period of 180 to 340 seconds, and then held for 20 seconds.

2. A tempered triple-silver LOW-E glass, characterized in that, The triple silver LOW-E glass was prepared by the tempering method according to claim 1.

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