WO-2026092254-A1 - VACUUM GLASS AND PREPARATION METHOD THEREFOR

WO2026092254A1WO 2026092254 A1WO2026092254 A1WO 2026092254A1WO-2026092254-A1

Abstract

Disclosed in the present invention are vacuum glass and a preparation method therefor. The method comprises: grinding a corner portion on the back surface of each of two glass sheets to form a notch; tempering the two glass sheets, applying first solder to the outer edge of the back surface of each of the glass sheets, and forming a gap; merging the two glass sheets; performing first sealing on the merged two glass sheets; placing a getter in a cavity between the two glass sheets through the gap on a sealing frame; sintering second solder to form an insert and placing the insert into the notch, one end of the insert being configured towards the cavity; mounting an elastic pressing device on the two glass sheets, the elastic pressing device elastically pressing against the other end of the insert; and sequentially performing vacuumizing and second sealing on the two glass sheets, so that a vacuum is formed in the cavity, and melting the second solder to seal the notch. The present invention solves the problem that, in existing preparation methods for vacuum glass, solder at an edge portion is prone to foaming when heated at high temperature under vacuum.

Inventors

HUA, SHAN

Assignees

南通皓晶真空玻璃科技有限公司

Dates

Publication Date: 20260507
Application Date: 20251022
Priority Date: 20241031

Claims (8)

A method for preparing vacuum glass, characterized by comprising the following steps: Two glass plates are provided, each glass plate having a front side and a back side, and a notch is formed by grinding one corner of the back side of the glass plate. The notch has an inner side facing the center of the plane of the glass plate and an outer side facing away from the center of the plane, and the width of the notch gradually decreases from the outer side of the notch to the inner side of the notch; The two glass plates are tempered and a first solder is applied to the outer edge of the back side of the glass plates. The first solder is arranged in a circle along the circumferential direction of the glass plates, and a notch is formed in the circle of the first solder. The notch is located at the notch position. The two glass plates are joined together so that their back sides face each other. Under normal pressure, the two glass plates after being laminated are sealed for the first time, so that the first solder melts to form a sealing frame bonded between the back sides of the two glass plates; The getter is placed into the cavity between the two glass plates through the notch on the sealing frame; The second solder is sintered to form a patch and inserted into the notch. One end of the patch faces the cavity. The sealing temperature of the second solder is lower than that of the first solder and the temperature difference is less than 150°C. An elastic pressure device is installed on the two glass plates, and the elastic pressure device is elastically pressed against the other end of the insert; The two glass plates are evacuated and then sealed a second time under vacuum, so that a vacuum is formed in the cavity, and the second solder melts to seal the gap; The elastic pressing device includes: a pressing rod abutting against the side of the glass plate away from the insert, the opposite ends of the pressing rod being bent to form two limbs, the ends of the two limbs extending to the outside of the other side of the glass plate near the insert; a reaction plate, positionably mounted on the ends of the two limbs; and a pressure plate elastically mounted on the side of the reaction plate facing the other side of the glass plate, the inner side of the pressure plate being connected to an inner liner plate, the inner liner plate having a socket groove, the other side of the glass plate near the insert being embedded in the socket groove, and the insert abutting against the bottom of the socket groove.
According to the vacuum glass preparation method of claim 1, the notch is formed on the back side of each of the two glass plates.
According to the vacuum glass preparation method of claim 2, a solder transition layer is provided between the first solder and the back side of the glass plate.
According to the vacuum glass preparation method of claim 1, the back side of the glass plate is formed with a limiting groove, one end of the limiting groove is connected to the notch, and the getter is contained in the limiting groove.
According to the vacuum glass preparation method of claim 1, the reaction plate has first through holes at its opposite ends, the ends of the two limbs are movably inserted into the first through holes, the ends of the limbs are formed with external threads, and the ends of the limbs are screwed with screwing members, which press against the other side of the reaction plate.
According to the vacuum glass preparation method of claim 5, the pressure plate is provided with second through holes on its opposite sides, and the two limb rods are movably inserted into the second through holes of the pressure plate.
According to the vacuum glass preparation method of claim 1, the wavelength of the infrared heating tube of the heating device in the sealing chamber is 900-1300 nm during the first and second sealing processes.
A vacuum glass, characterized in that it is prepared by the vacuum glass preparation method as described in any one of claims 1 to 7.

Description

Vacuum Glass and its Preparation Method Technical Field This invention relates to the field of vacuum glass technology, and more specifically to a vacuum glass and its preparation method. Background Technology Vacuum glass consists of two panes of glass sealed around the edges and separated by thin supports, with a vacuum in the middle. Due to the vacuum layer, vacuum glass possesses excellent thermal insulation and sound insulation properties, and is extremely thin and lightweight; furthermore, the excellent airtightness and sealing strength of the surrounding welds contribute to its superior performance. Based on these characteristics, vacuum glass is widely used in industries such as energy-efficient building doors and windows, and energy-efficient glass doors for refrigerators. Existing vacuum glass manufacturing methods (such as Chinese patent CN104030557B) mitigate the impact of edge venting on vacuum levels, but still fail to address the issues of foaming of the edge solder during high-temperature heating under vacuum and the need for double high-temperature annealing. Furthermore, the sealing solder, placed outside the glass, cannot fully wet the glass surface before reaching the sealing temperature and is difficult to press into the micro-vacuum layer to form an effective seal width. Once the sealing solder softens to a molten state, the lack of external constraint makes it prone to foaming. The sealing device is fixed to a mechanism outside the glass, restricting the glass placement and hindering continuous mass production. The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention To overcome the shortcomings of existing technologies, a vacuum glass and its preparation method are provided to solve the problem that existing vacuum glass preparation methods are prone to foaming when the edge solder is heated at high temperatures under vacuum. To achieve the above objectives, a method for preparing vacuum glass is provided, comprising: Two glass plates are provided, each glass plate having a front side and a back side, and a notch is formed by grinding one corner of the back side of the glass plate. The two glass plates are tempered and a first solder is applied to the outer edge of the back side of the glass plates. The first solder is arranged in a circle along the circumferential direction of the glass plates, and a notch is formed in the circle of the first solder. The notch is located at the notch position. The two glass plates are joined together so that their back sides face each other. Under normal pressure, the two glass plates after being laminated are sealed for the first time, so that the first solder melts to form a sealing frame bonded between the back sides of the two glass plates; The getter is placed into the cavity between the two glass plates through the notch on the sealing frame; The second solder is sintered to form a patch and inserted into the notch. One end of the patch faces the cavity. The sealing temperature of the second solder is lower than that of the first solder and the temperature difference is less than 150°C. An elastic pressure device is installed on the two glass plates, and the elastic pressure device is elastically pressed against the other end of the insert; The two glass plates are sequentially evacuated and then sealed a second time, creating a vacuum inside the cavity, and the second solder melts to seal the gap. Furthermore, the notch has an inner side facing the center of the plane of the glass plate and an outer side facing away from the center of the plane, and the width of the notch gradually decreases from the outer side of the notch to the inner side of the notch. Furthermore, the back sides of the two glass plates are respectively formed with the notches. Furthermore, a solder transition layer is provided between the first solder and the back of the glass plate. Furthermore, a limiting groove is formed on the back of the glass plate, one end of the limiting groove is connected to the notch, and the getter is contained in the limiting groove. Furthermore, the elastic pressure device includes: A pressure bar abuts against the side of the glass sheet away from the insert, and the opposite ends of the pressure bar are bent to form two limbs, the ends of which extend to the outside of the other side of the glass sheet near the insert. A reaction plate is installed in an adjustable position at the ends of the two limb rods; A pressure plate is elastically installed on one side of the reaction plate facing the other side of the glass sheet. An inner liner plate is connected to the inner side of the pressure plate. A socket groove is formed on the inner liner plate. The other side of the glass sheet near the