Cover plate glass strengthening process

Abstract

A cover plate glass strengthening method comprises the following steps: primary strengthening: cleaning the surface of cover plate glass to be strengthened, immersing the cover plate glass into ion exchange molten salt in a strengthening furnace, controlling the temperature at 350-380 DEG C, immersing the cover plate glass for 4-7 hours, and carrying out ion exchange, wherein the molten salt beinga molten liquid of more than one of potassium salt, sodium salt and lithium salt; secondary strenthening: controlling the temperature of a strengthening furnace to be 370-400 DEG C, soaking the coverplate glass into molten salt liquid of potassium salt and lithium salt with the mass fraction being 70-100:0-30, soaking is conducted for 1-3 hours, then putting the cover plate glass in a closed container to be cooled to the room temperature, so that the strengthened cover plate glass is obtained. The stress depth of the reinforced cover plate glass is 40-65 microns, the surface stress strengthis 800-1300 MPa, the warping degree is lower than 0.1 mm, and the boundary dimension expansion rate is lower than 2%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a strengthening process of cover glass. Background technique [0002] Cover glass (CoverLens), also known as strengthened optical glass, glass window, strengthened mobile phone lens, etc., is mainly used in the outermost layer of the touch screen. Its main raw material is ultra-thin flat glass, which has been cut, CNC carved, thinned, strengthened, After coating, printing and other processes, it has the functions of impact resistance and scratch resistance. The glass itself is very brittle and fragile, and the cover glass is very thin. The Baidu range is between 0.3-0.8mm. If it is not strengthened or tempered, the cover glass is easy to break under a very small external force, which will affect the cover. Further applications of glass. [0003] Therefore, in the current prior art, in order to meet the various environmental performances required by the glass used in mobi...

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Problems solved by technology

[0008] In order to solve the problems in the prior art of insufficient strengthening of cover glass (low self-favorable parameters), uneven distribution of glass plane stress, and excessive curvature, the present invention proposes a solution based on the following principles. It can effectively improve the CS (stress value) and DOL (stress depth) of the glass cover of the mobile phone and reduce the problem of warpage

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