CN116891334A - Tempering method of three-silver LOW-E glass and tempered three-silver LOW-E glass - Google Patents

Abstract

The application relates to the technical field of glass, in particular to the field of IPC C03B27, and further relates to a toughening method of three-silver LOW-E glass and toughened three-silver LOW-E glass. The method comprises the following steps: pretreatment: cutting, edging and cleaning the three-silver LOW-E glass; (II) heat treatment: the pretreated three-silver LOW-E glass is sent into a double-chamber convection tempering furnace through a roller way for heating treatment; (III) cooling treatment: transferring the three-silver LOW-E glass subjected to the heating treatment from the heating zone to an air cooling zone, and performing cooling treatment; (IV) lower sheet loading frame: and (5) sending the three-silver LOW-E glass subjected to cooling treatment out of the double-chamber convection tempering furnace, and carrying out sheet unloading and frame loading. According to the technical scheme, the tempering time is greatly shortened, and the obtained tempered three-silver LOW-E glass has excellent optical performance and mechanical strength.

Description

A kind of tempering method of triple silver LOW-E glass and tempered triple silver LOW-E glass

Technical field

The present invention relates to the field of glass technology, especially to the field of IPC C03B27. Furthermore, it relates to a tempering method of triple silver LOW-E glass and tempered triple silver LOW-E glass.

Background technique

In recent years, with the changes in people's way of thinking and design concepts, the application of glass in the construction field has become more and more common. However, the use of glass windows or glass curtain walls is not conducive to the implementation of energy conservation and emission reduction policies, so energy-saving glass has also be developed. Among them, triple silver LOW-E (low-emissivity) glass has broad application prospects due to its low emissivity and high reflective properties for infrared radiation. However, currently, triple-silver Low-E glass that requires tempering often fails to meet product quality requirements, so it has not yet been fully promoted and used in China.

Chinese patent CN202011043190 discloses a tempered coated glass and a tempering treatment method. In this technical solution, in the tempering step, for example, the pretreated coated glass to be tempered is sent to a convection tempering furnace through a roller for high-temperature heating treatment. For example, the convection tempering furnace is provided with a preheating section, a heating section and an annealing section in sequence. The temperature of the preheating section is, for example, 300-450°C, the preheating time is 1-10 minutes, the temperature of the heating section is 620-720°C, and the heating time The duration is 1 to 20 minutes, the annealing section temperature is, for example, 400 to 650°C, and the annealing time is 1 to 30 minutes. In the cooling step, for example, the tempered coated glass is cooled, for example, by being sent to an air grille for reciprocating cooling until it is cooled to normal temperature. However, the tempering process of this technical solution takes a long time, and may cause problems such as upturned glass.

Contents of the invention

A first aspect of the invention provides a tempering method for triple silver LOW-E glass, which includes the following steps:

(1) Pretreatment: Cut, grind and clean triple silver LOW-E glass;

(2) Heating treatment: The pretreated triple silver LOW-E glass is sent into the double-chamber convection tempering furnace through a roller conveyor for heating treatment;

(3) Cooling treatment: Transfer the heat-treated triple silver LOW-E glass from the heating area to the air-cooling area for cooling treatment;

(4) Unloading and racking: Send the triple-silver LOW-E glass after cooling treatment out of the double-chamber convection tempering furnace for unloading and racking.

Preferably, the speed at which the three-silver LOW-E glass is fed into the double-chamber convection tempering furnace is 430-470 mm/s; the speed at which it is sent out of the double-chamber convection tempering furnace is 480-520 mm/s.

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

Preferably, the heating power of the upper furnace in the heat treatment in step (2) is 90-95% of the rated power of the upper furnace.

Preferably, in the heat treatment in step (2), the heating power of the lower furnace is 80-90% of the rated power of the lower furnace.

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

Preferably, the heating treatment in step (2) includes at least a first heating treatment and a second heating treatment.

Preferably, the heating treatment in step (2) includes a first heating treatment and a second heating treatment.

Preferably, the first heating treatment is: heating from 25°C to 560-580°C, and maintaining the temperature for 15-25 seconds.

Preferably, the heating time period of the first heating treatment from 25°C to 560-580°C is 0-160 s.

Preferably, the second heat treatment is: heating from 560 to 580°C to 670 to 690°C, and maintaining the temperature for 15 to 25 seconds.

Preferably, the heating time period of the second heating treatment from 560 to 580°C to 670 to 690°C is 180 to 340 seconds.

Preferably, the first heating treatment is: heating from 25°C to 570°C within a time period of 0 to 160s, and maintaining the temperature for 20s.

Preferably, the second heating treatment is: heating from 570°C to 680°C within a period of 180 to 340 seconds, and maintaining the temperature for 20 seconds.

Preferably, the swing speed of the three-silver LOW-E glass during the heat treatment process includes at least three different swing speeds.

Preferably, the swing speed of the three-silver LOW-E glass during the heat treatment process includes 5 different swing speeds.

Preferably, the five different swing speeds are respectively 45~55mm/s, 75~85mm/s, 115~125mm/s, 170~190mm/s, and 210~230mm/s.

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

Preferably, the heating treatment process includes at least three stages of different convection frequencies.

Preferably, the heating treatment process includes 5 stages of different convection frequencies.

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

Preferably, the total frequency of convection is 50Hz.

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

Generally speaking, due to the existence of the LOW-E film layer of triple silver LOW-E glass, the LOW-E film layer will reflect part of the heat, which can easily lead to uneven heating on both sides of the triple silver LOW-E glass, thus causing its flatness and film Layer performance is affected. In order to solve the above technical problems, the existing technology will adopt a low-temperature and long-term method. However, the applicant has discovered through a large number of creative experiments that when the application adopts heating treatment including the first heating treatment and the second heating treatment, the first heating treatment The treatment is: heating from 25°C to 570°C in the time period of 0 to 160s, and keeping the temperature for 20s; the second heating treatment is: raising the temperature from 570°C to 680°C in the time period of 180 to 340s, and keeping the temperature for 20s. The prepared tempered three-silver LOW-E glass has good light transmittance, shading coefficient, heat transfer coefficient and flatness. The applicant guesses that this is because in the heating treatment in step (2) of the present application, the heating power of the upper furnace is 90-95% of the rated power of the upper furnace, and in the heating treatment in step (2), the heating power of the lower furnace is 80 to 90% of the rated power of the lower furnace can reduce the asymmetry of heating between the LOW-E film layer and the glass surface to a certain extent; and the swing speed of Sanyin LOW-E glass during the heating process includes 5 different swing speeds and 5 different convection frequencies can make the LOW-E film layer and glass surface of triple silver LOW-E glass heat more evenly, avoiding warping deformation and also avoiding the excessive difference between compressive stress and tensile stress. rupture; at the same time, it can also protect the LOW-E film layer of triple silver LOW-E glass from being affected, and maintain the higher light transmittance, lower shading coefficient, and lower heat transfer coefficient of triple silver LOW-E glass. Suitable for urban curtain walls, residences, public venues and awnings.

The applicant further discovered during the experiment that when the five different swing speeds are respectively 45~55mm/s, 75~85mm/s, 115~125mm/s, 170~190mm/s, and 210~230mm/s, When the time periods of the five different swing speeds are 0~72s, 72~144s, 144~216s, 216~288s, and 288~360s, it can also avoid collision and scratches on the Sanyin LOW-E glass to a certain extent. and further improve flatness.

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

Preferably, the height of the upwind grid in the cooling treatment process in step (3) is 20 to 30 mm from the surface of the triple silver LOW-E glass; the height of the downwind grid from the surface of the triple silver LOW-E glass is 20 to 30 mm.

Preferably, the height of the upwind grid in the cooling treatment process in step (3) is 25 mm from the surface of the triple silver LOW-E glass; the height of the downwind grid from the surface of the triple silver LOW-E glass is 25 mm.

Preferably, the cooling treatment in step (3) includes quenching treatment and cooling treatment.

Preferably, the swing speeds of the upper and lower air grids during the quenching process are both 180-220mm/s; the quenching time is 70-90s.

Preferably, the wind pressure during the quenching treatment process is 3000-3300MPa.

Preferably, the air pressure during the quenching process is 3200MPa.

Preferably, the swing speeds of the upper and lower air grilles during the cooling process are both 90-110mm/s; the cooling time is 70-90s.

The applicant found during the experiment that when the swing speeds of the upper and lower air grids are controlled to be 180-220mm/s during the quenching process, and the quenching time is 70-90s, the impact resistance of triple silver LOW-E glass can be improved. Has good tempering effect. The applicant further found that by further controlling the wind pressure of the quenching process to 3000-3300MPa under the above conditions, especially when the wind pressure of the quenching process is 3200MPa, the internal stress of the tempered glass can be stabilized and balanced, and the internal stress can be prevented. Excessive size will produce explosive fragments; it can effectively ensure the number of fragment particles.

Preferably, the wind pressure during the cooling process is 1700-1900MPa.

Preferably, the wind pressure during the cooling process is 1860MPa.

Preferably, the three-silver LOW-E glass tempering method provided by the present invention is suitable for use from May to October.

Preferably, if the three-silver LOW-E glass tempering method provided by the present invention is used in November, December, January to March, the difference from May to October is that the total time of the heat treatment is increased by 5~ 10%; the wind pressure during the quenching process and cooling process is reduced by 10%.

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

Beneficial effects:

1. The heating treatment used in this application includes the first heating treatment and the second heating treatment. The first heating treatment is: heating from 25°C to 570°C within a period of 0 to 160s, and holding for 20s; the second heating treatment The technical solution is: heating from 570°C to 680°C within a period of 180 to 340 seconds, and maintaining the temperature for 20 seconds. The prepared tempered three-silver LOW-E glass has good light transmittance, shading coefficient, heat transfer coefficient and flatness.

2. In this application, the 5 different swing speeds are respectively 45~55mm/s, 75~85mm/s, 115~125mm/s, 170~190mm/s, 210~230mm/s. When the time periods are 0~72s, 72~144s, 144~216s, 216~288s, and 288~360s, it can also avoid collision scratches on the triple silver LOW-E glass to a certain extent and further improve the flatness.

3. In this application, when the five different convection frequencies are respectively 40~50%, 35~45%, 30~40%, 20~30%, and 15~25% of the total convection frequency, the five different convection frequencies When the time periods are 0~72s, 72~144s, 144~216s, 216~288s, and 288~360s, the flatness and uniform color of the film layer can be further ensured.

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

5. This application further controls the wind pressure during the quenching process to 3000~3300MPa, especially when the wind pressure during the quenching process is 3200MPa, which can further stabilize and balance the internal stress of the tempered glass and prevent excessive internal stress from causing bursts. ; Can effectively ensure the number of fragment particles.

Description of the drawings

Figures 1 to 2 are physical pictures of tempered triple silver LOW-E glass obtained by using the triple silver LOW-E glass tempering method in Example 1.

Detailed ways

Example 1

Embodiment 1 provides a tempering method for triple silver LOW-E glass, including the following steps:

(1) Pretreatment: Cut, grind and clean triple silver LOW-E glass;

(2) Heating treatment: The pretreated triple silver LOW-E glass is sent into the double-chamber convection tempering furnace through a roller conveyor for heating treatment;

(3) Cooling treatment: Transfer the heat-treated triple silver LOW-E glass from the heating area to the air-cooling area for cooling treatment;

(4) Unloading and racking: Send the triple-silver LOW-E glass after cooling treatment out of the double-chamber convection tempering furnace for unloading and racking.

The Sanyin LOW-E glass was purchased from Yiyi Glass Holdings Co., Ltd., model: XTTG 0170.

The speed at which the three-silver LOW-E glass is fed into the double-chamber convection tempering furnace is 450mm/s; the speed at which it is sent out of the double-chamber convection tempering furnace is 500mm/s.

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

In the heating treatment in step (2), the heating power of the upper furnace is 95% of the rated power of the upper furnace.

In the heating treatment in step (2), the heating power of the lower furnace is 85% of the rated power of the lower furnace.

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

The heating treatment in step (2) includes a first heating treatment and a second heating treatment.

The first heating treatment is: heating from 25°C to 570°C within a time period of 0 to 160s, and maintaining the temperature for 20s.

The second heating treatment is: heating from 570°C to 680°C within a time period of 180 to 340s, and maintaining the temperature for 20s.

During the heat treatment process, the swing speed of triple silver LOW-E glass includes 5 different swing speeds.

The five different swing speeds are respectively 50mm/s, 80mm/s, 120mm/s, 180mm/s, and 220mm/s.

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

The heating treatment process includes 5 different convection frequencies.

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

The total frequency of convection is 50Hz.

The five time periods of different convection frequencies are respectively 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s.

In the cooling process in step (3), the height of the upwind grid from the surface of the triple silver LOW-E glass is 25 mm; the height of the downwind grid from the surface of the triple silver LOW-E glass is 25 mm.

The cooling process in step (3) includes rapid cooling process and cooling process.

The swing speeds of the upper and lower air grids in the quenching process are both 200mm/s; the quenching time is 80s.

The wind pressure during the quenching process is 3200MPa.

During the cooling process, the swing speeds of the upper and lower air grilles are both 100mm/s; the cooling time is 80s.

The wind pressure during the cooling process is 1860MPa.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Example 2

Embodiment 2 provides a tempering method for triple silver LOW-E glass, including the following steps:

(1) Pretreatment: Cut, grind and clean triple silver LOW-E glass;

(2) Heating treatment: The pretreated triple silver LOW-E glass is sent into the double-chamber convection tempering furnace through a roller conveyor for heating treatment;

(3) Cooling treatment: Transfer the heat-treated triple silver LOW-E glass from the heating area to the air-cooling area for cooling treatment;

(4) Unloading and racking: Send the triple-silver LOW-E glass after cooling treatment out of the double-chamber convection tempering furnace for unloading and racking.

The Sanyin LOW-E glass was purchased from Yiyi Glass Holdings Co., Ltd., model: XTTG 0170.

The speed at which the three-silver LOW-E glass is fed into the double-chamber convection tempering furnace is 450mm/s; the speed at which it is sent out of the double-chamber convection tempering furnace is 500mm/s.

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

In the heating treatment in step (2), the heating power of the upper furnace is 95% of the rated power of the upper furnace.

In the heating treatment in step (2), the heating power of the lower furnace is 85% of the rated power of the lower furnace.

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

The heating treatment in step (2) includes a first heating treatment and a second heating treatment.

The first heating treatment is: heating from 25°C to 570°C within a time period of 0 to 160s, and maintaining the temperature for 20s.

The second heating treatment is: heating from 570°C to 680°C within a time period of 180 to 340s, and maintaining the temperature for 20s.

During the heat treatment process, the swing speed of triple silver LOW-E glass includes 5 different swing speeds.

The five different swing speeds are respectively 55mm/s, 85mm/s, 125mm/s, 185mm/s, and 225mm/s.

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

The heating treatment process includes 5 different convection frequencies.

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

The total frequency of convection is 50Hz.

The five time periods of different convection frequencies are respectively 0-72s, 72-144s, 144-216s, 216-288s, and 288-360s.

In the cooling process in step (3), the height of the upwind grid from the surface of the triple silver LOW-E glass is 25 mm; the height of the downwind grid from the surface of the triple silver LOW-E glass is 25 mm.

The cooling process in step (3) includes rapid cooling process and cooling process.

The swing speeds of the upper and lower air grids during the quenching process are both 210mm/s; the quenching time is 80s.

The wind pressure during the quenching process is 3200MPa.

During the cooling process, the swing speeds of the upper and lower air grilles are both 100mm/s; the cooling time is 80s.

The wind pressure during the cooling process is 1860MPa.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Example 3

Embodiment 3 provides a method for tempering triple silver LOW-E glass. The specific implementation method is the same as that of Embodiment 1. The difference is that:

During the first heat treatment and the second heat treatment, the swing speed of the three-silver LOW-E glass includes three different swing speeds.

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

The three different swing speed time periods are respectively 0~120s, 120~240s, and 240~360s.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Example 4

Embodiment 4 provides a method for tempering three-silver LOW-E glass. The specific implementation method is the same as that of Embodiment 1. The difference is that the first heating treatment and the second heating treatment include three different stages. Convection frequency.

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

The three time periods of different convection frequencies are 0 to 120s, 120 to 240s, and 240 to 360s respectively.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Example 5

Embodiment 5 provides a method for tempering triple silver LOW-E glass. The specific implementation method is the same as that of Embodiment 1. The difference is that the swing speeds of the upper and lower air grids during the rapid cooling process are both 230 mm/s.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Example 6

Embodiment 6 provides a method for tempering triple silver LOW-E glass. The specific implementation method is the same as that of Embodiment 1. The difference is that the air pressure during the rapid cooling process is 3300MPa.

A kind of tempered three-silver LOW-E glass prepared by the above method.

Performance test: The following tests were performed on the tempered three-silver LOW-E glass (June) prepared in Examples 1 to 6:

1. Light transmittance and shading coefficient: Use spectrophotometer to detect.

2. Heat transfer coefficient: refer to standard T/CECS 627-2019.

3. Impact resistance, curvature, surface stress, fragmentation status: refer to standard GB/T35604-2017.

Test Results:

Claims (10)

1. the toughening method of the three-silver LOW-E glass is characterized by comprising the following steps of:

pretreatment: cutting, edging and cleaning the three-silver LOW-E glass;

(II) heat treatment: the pretreated three-silver LOW-E glass is sent into a double-chamber convection tempering furnace through a roller way for heating treatment;

(III) cooling treatment: transferring the three-silver LOW-E glass subjected to the heating treatment from the heating zone to an air cooling zone, and performing cooling treatment;

(IV) lower sheet loading frame: and (5) sending the three-silver LOW-E glass subjected to cooling treatment out of the double-chamber convection tempering furnace, and carrying out sheet unloading and frame loading.

2. The method for tempering three-silver LOW-E glass according to claim 1, wherein the heat treatment in the step (two) comprises at least a first heat treatment and a second heat treatment.

3. The method for tempering three-silver LOW-E glass according to claim 2, wherein the first heat treatment is: raising the temperature to 560-580 ℃ from 25 ℃, and preserving the heat for 15-25 s.

4. The method for tempering three-silver LOW-E glass according to claim 3, wherein the second heat treatment is: heating to 670-690 ℃ from 560-580 ℃, and preserving heat for 15-25 s.

5. The method for tempering three-silver LOW-E glass according to any one of claims 1 to 4, wherein the swinging speed of the three-silver LOW-E glass during the heat treatment includes at least 3 different swinging speeds.

6. The method for tempering three-silver LOW-E glass according to any one of claims 1 to 4, wherein the heat treatment process includes at least 3 different convection frequencies.

7. The method for tempering three-silver LOW-E glass according to claim 1, wherein the cooling treatment in the step (three) comprises a quenching treatment and a cooling treatment.

8. The method for toughening three-silver LOW-E glass according to claim 7, wherein the swinging speeds of the upper air grid and the lower air grid in the quenching treatment process are 180-220 mm/s; the quenching treatment time is 70-90 s.

9. The method for tempering three-silver LOW-E glass according to claim 8, wherein the wind pressure in the quenching process is 3000-3300 MPa.

10. A tempered trisilver LOW-E glass, characterized in that it is produced by a tempering method according to any one of claims 1 to 9.