High-pressure high-temperature edge sealing method for vacuum glass

Abstract

The invention relates to a high-pressure high-temperature edge sealing method for vacuum glass. The high-pressure high-temperature edge sealing method for the vacuum glass comprise the steps of (1) of coating one circle of closed low-melting-point glass powder onto the edge periphery of a lower glass piece with a support object, and combining an upper glass piece with the lower glass piece; (2) putting the combined glass into a high-pressure high-temperature heating pot in a manner of vertically arranging the glass or flatly putting the glass on a bracket; and (3) increasing the temperature in the high-pressure high-temperature heating pot to the melting point of the glass powder 350 DEG C to 480 DEG C, increasing the pressure 0.1MPa to 5MPa into the pot by an air compressor, keeping the temperature and the pressure for 0.2 hour to 2 hours, and decreasing the pressure and the temperature to obtain a vacuum glass finished product. With the adoption of the high-pressure high-temperature edge sealing method for the vacuum glass, the low-melting-point glass powder is put between the edges of the two glass pieces; the temperature is increased to 350 DEG C to 480 DEG C under the normal pressure in the high-pressure pot; after the low-melting-point glass powder is molten, the pressure increase is performed, so that the two glass pieces are extruded in a vacuum way; therefore, the molten low-melting-point glass powder contacts with the upper glass piece and the lower glass piece fully and closely; the heat conduction speed and the heat conduction amount are increased; the adhesion force and the leveling performance of the molten powder are enhanced; the sealing quality of edges sealed with the low-melting-point glass powder is improved; and the technical difficulty of air leakage after the edge sealing is effectively solved.

Description

technical field [0001] The invention belongs to the field of vacuum glass and relates to edge sealing of vacuum glass, in particular to a high-pressure and high-temperature edge sealing method of vacuum glass. Background technique [0002] Generally, the manufacture of vacuum glass is under normal pressure (that is, the pressure in the container is lower than 0.1mpa, and the vacuum degree is lower than 0.02mpa), or under high vacuum and equal pressure, the glass edge is sealed by melting low melting point glass powder at high temperature. Because the low-melting-point glass powder is naturally leveled under equal pressure and sealed after contacting the upper and lower sheets of glass to solidify, the leveling and adhesion of the low-melting-point glass powder for edge sealing are not good after melting, resulting in large defects in the quality of edge sealing , the air leakage rate after edge sealing is not less than 15%. Contents of the invention [0003] The purpose o...

AI Technical Summary

Problems solved by technology

Because the low-melting-point glass powder is naturally leveled under equal pressure and sealed after contacting the upper and lower sheets of glass to solidify, the leveling and adhesion of the low-melting-point glass powder for edge sealing are not good after melting, resulting in large defects in the quality of edge sealing , the air leakage rate after edge sealing is not less than 15%