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CN-119591325-B - Multidirectional bending fatigue-resistant electronic glass and preparation method thereof

CN119591325BCN 119591325 BCN119591325 BCN 119591325BCN-119591325-B

Abstract

The invention discloses a multidirectional bending fatigue-resistant electronic glass and a preparation method thereof, wherein the preparation method comprises the steps of cleaning with a pre-soaking solution, washing with water, chemically thinning after film pasting protection, then carrying out local high-temperature annealing and stretching thinning, and finally carrying out chemical tempering to obtain the multidirectional bending fatigue-resistant electronic glass; the chemical thinning is to etch the two sides of the electronic glass to obtain etching grooves with double-sided symmetry. According to the invention, the electronic glass is treated by adopting a two-stage treatment method of chemical thinning, local high-temperature annealing and stretching thinning, so that the bending resistance of the electronic glass is improved, and the double-sided bending of the electronic glass is realized.

Inventors

  • WANG HUAN
  • YANG KAILONG
  • ZHANG HONGJUN
  • LIU LEI
  • LAN DONG
  • WANG MINGZHONG

Assignees

  • 宜昌南玻光电玻璃有限公司
  • 中国南玻集团股份有限公司

Dates

Publication Date
20260512
Application Date
20241215

Claims (7)

  1. 1. A preparation method of multi-directional bending fatigue-resistant electronic glass is characterized by comprising the following steps: (1) Pre-cleaning, namely cleaning an electronic glass raw sheet in a pre-soaking solution, and then washing with water; (2) Sticking a UV film on two sides of the pre-cleaned electronic glass raw sheet, and reserving two non-sticking areas on two sides; (3) Chemical thinning, namely performing chemical thinning by acid liquor top spraying on electronic glass, and forming etching grooves in the non-sticky area; (4) Cleaning, namely removing the UV film and then secondarily cleaning by using presoaked liquid; (5) Local annealing, namely heating the etched groove of the electronic glass, and then carrying out local high-temperature annealing and stretching thinning; (6) And (3) chemical tempering, namely tempering the electronic glass subjected to stretching and thinning in tempering liquid, and then cleaning, wherein the local high-temperature annealing condition in the step (5) is that the temperature is kept for 3-8min at 400-600 ℃, and the stretching force of the stretching and thinning is 3-6N.
  2. 2. The method according to claim 1, wherein the pre-soaking solution in the steps (1) and (4) comprises 2-8% hydrofluoric acid, 7-15% auxiliary acid and 80-85% deionized water, and the auxiliary acid is one or more of sulfuric acid, oxalic acid and hydrochloric acid.
  3. 3. The method according to claim 1, wherein the washing conditions in the steps (1) and (4) are 30-50 ℃ for 10-15min.
  4. 4. The method of claim 1, wherein the non-adhesive area in step (2) has a width of 1-5mm and is 50-100mm from the edge of the electronic glass.
  5. 5. The method according to claim 1, wherein the acid solution in the step (3) is composed of 5-17% hydrofluoric acid and 9-20% auxiliary acid, the auxiliary acid is one or more of sulfuric acid, oxalic acid and nitric acid, the chemical thinning rate is 1.8-3 μm/min, and the thinning time is 100-150min.
  6. 6. The method of claim 1, wherein the UV film is removed in step (4) by ultraviolet irradiation for 1-2min.
  7. 7. The method of claim 1, wherein the tempering temperature in the step (6) is 390-450 ℃ and the tempering time is 1.5-3h.

Description

Multidirectional bending fatigue-resistant electronic glass and preparation method thereof Technical Field The invention belongs to the technical field of electronic display devices, and particularly relates to multidirectional bending fatigue-resistant electronic glass and a preparation method thereof. Background Electronic glass generally refers to ultra-thin float glass with the thickness of less than 2mm, and refers to a high-technology product which can be applied to the fields of electronics, microelectronics and optoelectronics, and is mainly used for manufacturing integrated circuits and glass materials with photoelectric, thermoelectric, acousto-optic, magneto-optic and other functional components. With the rapid development of the folding screen display market, manufacturers push out new folding screen products almost every quarter, so that higher and higher requirements are put forward on bendable electronic glass matched with the folding screen display device, and the electronic glass not only needs to meet the optical properties such as high light transmittance, but also needs to have excellent mechanical properties such as scratch resistance, drop resistance, multiple bending resistance, small folds and the like. Chinese patent CN117776519a discloses an ultra-thin flexible reinforced glass and its preparation method, the glass comprises, by mass percentage of oxides, 57.5-61.8% of SiO 2, 13.9-15.2% of Al 2O3, 12.1-13.2% of Na 2 O, 6.2-7.2% of MgO, 5.5-6.4% of K 2 O, 0.4-1.0% of ZrO 2, the ultimate bending radius of curvature is 4-13mm, and the sustainable bending pressure is 400-840MPa. Chinese patent CN113173708a discloses a processing method for improving bending performance of flexible glass, which includes the steps of cutting, etching, debonding and chemically toughening multi-layer glued flexible glass to obtain flexible glass with enhanced bending performance, wherein the multi-layer glued flexible glass includes a bottom plate at the lowest layer and at least 1 repeating unit layer glued on the upper layer of the bottom plate, the repeating unit layer includes flexible glass at the lower layer and a substrate glued on the upper layer of the flexible glass, and the repeating unit layers are glued and laminated together. The final bending breaking rate is only 1-2%. The prior bendable electronic glass is generally 20-40 mu m in equal thickness, although the hinge of the mobile phone can meet the requirement of flexible folding, the front surface of the mobile phone screen is not scratch-resistant and bending-resistant because the whole piece of glass is too thin, so that the user experience is greatly affected, besides, although students put forward the concept of the bendable electronic glass with different thicknesses, however, the stress concentration of the joint area with unequal thickness cannot be properly treated, so that the electronic glass is easily broken in the use process, and the existing electronic glass with unequal thickness and bendable can only meet the requirement of unidirectional folding and cannot be suitable for the display requirement of a future multidirectional folding electronic display device. Disclosure of Invention According to the electronic glass capable of being bent in multiple directions and resisting fatigue and the preparation method thereof, the electronic glass is treated by adopting a two-stage treatment method of chemical thinning, local high-temperature annealing and stretching thinning, so that the bending resistance of the electronic glass is improved, and double-sided bending of the electronic glass is realized. In order to achieve the above object, the present invention provides a method for preparing a multidirectional bending fatigue-resistant electronic glass, comprising the steps of: (1) Pre-cleaning, namely cleaning an electronic glass raw sheet in a pre-soaking solution, and then washing with water; (2) Sticking a UV film on two sides of the pre-cleaned electronic glass raw sheet, and reserving two non-sticking areas on two sides; (3) Chemical thinning, namely performing chemical thinning by acid liquor top spraying on electronic glass, and forming etching grooves in the non-sticky area; (4) Cleaning, namely removing the UV film and then secondarily cleaning by using presoaked liquid; (5) Local annealing, namely heating the etched groove of the electronic glass, and then carrying out local high-temperature annealing and stretching thinning; (6) And (3) chemical tempering, namely putting the stretched and thinned electronic glass into tempering liquid for tempering, and then cleaning. Preferably, the electronic glass raw sheet in the step (1) is high-alumina electronic glass, wherein the mass fraction of aluminum is 9.7-14.8%. Preferably, the washing in step (1) includes the following steps: S1, spraying liquid medicine; S2, air cutting and deionized water flushing; S3, ultrasonic cleaning. Preferably, the pre-soaking liquid in the ste