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UTG chemical strengthening process

A chemical and process technology, applied in the field of UTG chemical strengthening process, can solve the problems of poor regional pits, inability to meet the needs of use, and apparent warpage and deformation of the product, and achieve the ability to improve the processing limit, reduce warpage, and reduce the degree of defect. Effect

Pending Publication Date: 2022-08-09
WGTECH JIANGXI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to enhance the flexibility and durability of UTG, it is usually necessary to strengthen UTG. The conventional strengthening process is generally only used for glass products with a thickness above 0.15mm. More than 90%, and the appearance of the product has obvious warping deformation and poor pits in the area, which cannot meet the needs of use

Method used

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  • UTG chemical strengthening process

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Effect test

Embodiment 1～8

[0045] ①HF acid etching. The product to be treated is exposed and immersed in a 2.5mol / L HF acid solution for double-sided etching. See Table 1 for etching times.

[0046] ②Cleaning. Clean to remove HF acid residues and other surface contamination to ensure clean product surface.

[0047] ③ Preheating. The product was raised from normal temperature to 390°C.

[0048] ④ strengthen. The product is soaked for a period of time in a strengthening solution (molten potassium nitrate). The soaking time is 15min, and the strengthening temperature is 390℃.

[0049] ⑤ Annealing. After the product is taken out of the strengthening liquid, it is cooled from the strengthening temperature to 50°C.

[0050] ⑥ Soak in water. Soak the product in 50℃ pure water to dissolve and remove the salt residue on the surface.

[0051] ⑦HF acid etching. The product to be treated is exposed and soaked in a 1mol / L HF acid solution, and double-sided etching is performed to repair the apparent warpa...

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Abstract

The invention provides a UTG chemical strengthening process which comprises the following steps: A) immersing a UTG material to be chemically strengthened into an HF solution, and carrying out double-sided etching; the concentration of the HF solution is 1-4 mol / L; the time of the double-sided etching is 10 to 20 minutes; b) cleaning to remove residual acid on the surface of the UTG, and then preheating to 360-390 DEG C; c) immersing the preheated UTG in a strengthening liquid for chemical strengthening; and D) annealing and soaking the chemically strengthened UTG in water to obtain the strengthened UTG. Through the combination of etching before tempering and etching after tempering, the apparent reject ratio of the UTG product is reduced from 90% to 10% or below, meanwhile, the bad degree is greatly reduced, the trial production requirement is preliminarily met, meanwhile, the machining limit capacity of the chemical strengthening process in the product thickness aspect is improved through the technology, and the minimum thickness of the machinable product can be as low as 0.03 mm.

Description

technical field [0001] The invention belongs to the technical field of ultra-thin flexible glass production, and in particular relates to a UTG chemical strengthening process. Background technique [0002] At present, mainstream mobile phone manufacturers will focus on the layout of folding screens as a means of mobile phone innovation and entry into the high-end market. [0003] At present, the mass-produced and listed flexible folding cover materials are mainly divided into CPI (transparent polyimide film) and UTG (ultra-thin flexible glass). CPI is an engineering plastic; UTG is the flexibility of glass when the thickness is less than 100 μm, so it can keep the advantages of glass itself while being light, thin and bendable. Compared with CPI, the advantages of UTG are: 1) High light transmittance: UTG is based on the characteristics of glass, and the light transmittance exceeds 90%; 2) Strong durability: UTG material is durable, not easy to be damaged after bending, not...

Claims

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Application Information

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IPC IPC(8): C03C15/00C03C21/00C03B25/00
CPCC03C15/00C03C21/001C03B25/00
Inventor 张迅易伟华杨会良周俊敏谢凯立徐艳勇
Owner WGTECH JIANGXI