Secondary chemical strengthened UFG glass and preparation method thereof

By adjusting the component ratio of UFG glass and the staged chemical strengthening process, the warping and wrinkling problems caused by uneven thickness during the chemical strengthening process of UFG glass have been solved, achieving uniform stress distribution and high yield of glass, which is suitable for flexible screen protection of foldable devices.

CN122127059APending Publication Date: 2026-06-02IRICO +1
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Patent Information

Application Number
CN202610040675.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-13
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the existing technology, the uneven thickness of UFG glass during the chemical strengthening process leads to significant differences in the amount of expansion in different areas, resulting in warping and wrinkling of the cover plate after strengthening. This affects the flatness and yield of the product, limiting its application in high-end foldable screen devices.

Method used

By employing a UFG glass formulation with specific component ratios and a secondary chemical strengthening process, and by adjusting the molar ratios of SiO2, Al2O3, Na2O, Li2O, B2O3, MgO, P2O5, and SnO2, combined with staged chemical strengthening and regional protection, the volume expansion behavior of different thickness regions is coordinated to ensure a consistent volume expansion rate.

Benefits of technology

It effectively avoids the problem of uneven stress distribution caused by thickness differences, improves product flatness and yield, and is suitable for flexible screen protection of foldable devices.

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Abstract

The invention discloses secondary chemical strengthened UFG glass and a preparation method thereof, and relates to the technical field of ultrathin flexible glass. The UFG glass subjected to secondary chemical strengthening is prepared from the following raw materials in percentage by mole: 59.85 percent to 69.43 percent of SiO2, 11.81 percent to 18.45 percent of Al2O3, 7.5 percent to 10.48 percent of Na2O, 6.7 percent to 9.0 percent of Li2O, 0 to 3.7 percent of B2O3, 0 to 3.65 percent of MgO, 0 to 4.59 percent of P2O5 and 0.9 percent of SnO2. After the UFG glass is chemically strengthened twice, the volume expansion rates of the first area and the second area of the UFG glass with different thicknesses are equal, so that the problems that the strengthened cover plate glass is easy to twist, deform, fold and the like are avoided, the yield is increased, and large-scale production is facilitated.
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