Vacuum glass and preparation method thereof

Abstract

The invention provides vacuum glass which comprises upper glass and lower glass, wherein the upper glass and the lower glass are convex glass or flat glass, an edge banding frame is arranged at the periphery of the upper glass, an edge groove is formed in the periphery of the lower glass, and the peripheries of the upper glass and the lower glass are welded together through a low-temperature solder material in a vacuum edge sealing furnace, and a closed vacuum layer is formed between the upper glass and the lower glass. The preparation method is simple; and the prepared vacuum glass and tempered vacuum glass can overcome the defects in the prior art, the gas tightness of the vacuum glass can be effectively ensured, and the strength and the heat insulation and sound insulation properties of the vacuum glass can be enhanced.

Description

technical field [0001] The invention relates to the technical field of glass deep processing, in particular to a vacuum glass and a manufacturing method thereof. Background technique [0002] The existing vacuum glass is generally composed of two pieces of flat glass. The glass is sealed with low-temperature glass solder around the glass, and there is a tiny support in the middle. A thin vacuum layer with a thickness of 0.1-0.2mm is formed between the two pieces of glass through the air extraction hole. Since there is no heat and sound transmission of gas, and the inner surface of the glass can have a transparent low-heat radiation film, the vacuum glass has good heat insulation and sound insulation effects, and is the best energy-saving glass. [0003] The most critical technology for preparing vacuum glass is edge sealing. The existing vacuum glass edge sealing process is to form a staggered or inner chamfer at the peripheral welding of the upper and lower two pieces of gl...

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Problems solved by technology

[0003] The most critical technology for preparing vacuum glass is edge sealing. The existing vacuum glass edge sealing process is to form a staggered or inner chamfer at the peripheral welding of the upper and lower two pieces of glass, and place the low melting point glass powder on the staggered or inner chamfer. Heating to melt the low-melting-point glass powder, and using the capillary action of the liquid at high temperature to make the molten low-melting-point glass powder enter the gap between the upper and lower glasses, so as to realize the welding of the upper and lower glasses; the main disadvantage is that the sealing edge is uneven Irregularity, poor sealing reliability, unable to extract air from the welding place, a special air extraction port must be set up, welding and air extraction cannot be completed in one step, first welding and then air extraction, resulting in large stress on the edge of the glass, and the vacuum glass is easily damaged. Can only be done in one piece, low production efficiency, high cost, etc.

Patents CN201206116Y and CN201553684U disclose a vacuum glass edge sealing structure, which uses a ring groove around the glass and places low-melting glass powder in the ring groove, which solves the problem of uneven sealing edges of vacuum glass and poor sealing reliability. Advanced problems, but did not solve other problems of the existing vacuum glass edge sealing process

In the patent application 2012100754353, the applicant of the present invention overcomes the main shortcomings in the existing vacuum glass edge sealing process by setting an edge banding frame at the welding place around the glass, but one of the disadvantages is that the edge banding frame needs to be sintered at high temperature, The pressed edge grooves also need high-temperature treatment. For glass that does not need to be tempered, it not only wastes energy but also easily leads to deformation of the glass under high temperature; the etching process of edge grooves is not only harmful to the physical and mental health of workers, but also harmful It is beneficial to environmental protection; the second is that the edge sealing strip frame needs a certain height, resulting in a thicker vacuum layer between the upper and lower glass. For the vacuum glass with supports, the diameter and height of the supports will be smaller. Larger, not only the support is clearly visible, but also more heat and sound will be transmitted, which will affect the visibility of the vacuum glass and the performance of heat and sound insulation

[0004] The edge banding of the existing vacuum glass is generally to weld two pieces of glass together with low-temperature solder in the edge banding furnace using conventional heating. The disadvantages of conventional heating are long heating time, slow heating rate, slower cooling rate, and energy consumption. High, poor heating uniformity, especially when making Low-E vacuum glass in a vacuum state, because there is no convective heat transfer, and the Low-E film seriously restricts radiation heat transfer, so its shortcomings are more prominent

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