CN-122010418-A - Protective film and method for producing same

Abstract

The application provides a protective film and a manufacturing method thereof, wherein the protective film is a flexible glass substrate with the thickness smaller than or equal to 0.5mm, the manufacturing method comprises the following steps of carrying out chemical etching thinning on the glass substrate by using etching liquid to obtain a protective film blank with target thickness, carrying out silk-screen printing protective ink step, respectively coating protective ink on two opposite surfaces of the protective film blank, carrying out edge treatment step, namely placing the protective film blank coated with the protective ink in acidic passivation liquid to remove microcracks at the edge of the protective film blank, carrying out ink fading step, namely using an ink fading agent to fade protective ink on the protective film blank, and carrying out polishing treatment on the protective film blank subjected to ink fading in first polishing liquid for the first time. The protective film and the manufacturing method thereof provided by the application have reasonable process flow design, effectively improve the production yield of the protective film, improve the strength consistency of the protective film and improve the edge microcracks and the surface defects.

Inventors

• Gong Derun
• LI YIBO

Assignees

• 深圳市简皆科技有限公司

Dates

Publication Date

20260512

Application Date

20260224

Claims (11)

1. 1. A method for manufacturing a protective film using a flexible glass substrate having a thickness of 0.5mm or less, comprising the steps of: Etching and thinning, namely chemically etching and thinning the glass substrate by adopting etching liquid to obtain a protective film blank with target thickness; respectively coating protective ink on the two opposite surfaces of the protective film blank; the edge treatment step, namely placing the protective film blank coated with the protective ink into an acidic passivation solution for treatment so as to remove microcracks at the edge of the protective film blank; an ink fading step of fading the protective ink on the protective film blank by using an ink fading agent; and (3) a first polishing step, namely placing the protective film blank subjected to ink removal into a first polishing solution for polishing treatment.
2. 2. The method of manufacturing a protective film according to claim 1, further comprising a backing plate attaching step of attaching the entire glass substrate to a rigid backing plate by an optical adhesive.
3. 3. The method of producing a protective film according to claim 2, further comprising a separation step of separating the protective film blank from the backing sheet before the step of screen printing the protective ink.
4. 4. The method of producing a protective film according to claim 3, wherein the separation step is carried out at an ambient temperature ranging from 20 ℃ to 25 ℃, a humidity ranging from 40% to 60%, a separation speed ranging from 10 mm/s to 30mm/s, and a separation angle ranging from 90 ° to 120 °.
5. 5. The method of manufacturing a protective film according to claim 1, further comprising a chemical strengthening step of subjecting the protective film blank after the first polishing treatment to ion exchange in a molten alkali salt.
6. 6. The method of manufacturing a protective film according to claim 5, further comprising a second polishing step of placing the reinforced protective film blank in a second polishing liquid having a pH greater than that of the first polishing liquid, wherein the first polishing liquid and the second polishing liquid are acidic polishing liquids, respectively.
7. 7. The method of manufacturing a protective film according to claim 6, wherein in the second polishing step, the polishing temperature is in the range of 20 ℃ to 25 ℃, the polishing time is in the range of 30 seconds to 90 seconds, and the polishing depth is not more than 2 μm.
8. 8. The method of manufacturing a protective film according to claim 1, wherein in the first polishing step, during polishing of the protective film blank using the first polishing liquid, vibration assistance is performed by megasonic waves having a frequency in the range of 0.8 to 1.2MHz, a polishing time of 60 to 180 seconds, and a polishing depth of 2 to 3 μm.
9. 9. The method of manufacturing a protective film according to claim 1, wherein the acidic passivation solution in the edge treatment step is a mixed aqueous solution comprising hydrofluoric acid, nitric acid and a buffer, the treatment temperature is 25 ℃ to 35 ℃, and the treatment time is 30 seconds to 90 seconds.
10. 10. The method of manufacturing a protective film according to claim 1, further comprising a lamination step of laminating a plurality of said protective film blanks in a jig with a buffer material interposed between adjacent two of said protective film blanks, before said edge processing step.
11. 11. A protective film manufactured by the manufacturing method according to any one of claims 1 to 10.

Description

Protective film and method for producing same Technical Field The application relates to the technical field of screen protective films, in particular to a protective film and a manufacturing method thereof. Background Traditional glass is thick, heavy, high in brittleness and incapable of being bent, and the use requirements of flexible electronic equipment such as folding screens are difficult to meet. The ultra-thin flexible glass (UTG) is a glass material with flexibility and bending property, has a thickness of less than or equal to 500 micrometers, and can be bent at will under the action of external force without heat treatment unlike the conventional rigid glass used for the protective film. The material is prepared by a special manufacturing process, has the characteristics of ultra-thin, wear-resistant, high-temperature-resistant, corrosion-resistant, high-strength, high light transmittance, bending property, good rebound resilience and the like, and can be applied to flexible electronic equipment such as folding screens and the like. In the process of realizing the application, the inventor finds that the prior art has at least the following problems that the prior UTG protective film manufacturing process is not perfect enough, so that the produced UTG protective film has the problems of poor strength consistency, easy breakage and the like, and the reliability, flexibility and optical performance of the final product are affected. Disclosure of Invention Based on the above, the present application provides a protective film and a method for manufacturing the same, so as to solve at least one of the problems of poor process design, poor strength uniformity, and easy cracking in the prior art. In order to achieve the above object, the technical solution of the embodiment of the present application is as follows: In one aspect, an embodiment of the present application provides a method for manufacturing a protective film using a flexible glass substrate having a thickness of 0.5mm or less, the method comprising the steps of: Etching and thinning, namely chemically etching and thinning the glass substrate by adopting etching liquid to obtain a protective film blank with target thickness; respectively coating protective ink on the two opposite surfaces of the protective film blank; the edge treatment step, namely placing the protective film blank coated with the protective ink into an acidic passivation solution for treatment so as to remove microcracks at the edge of the protective film blank; an ink fading step of fading the protective ink on the protective film blank by using an ink fading agent; and (3) a first polishing step, namely placing the protective film blank subjected to ink removal into a first polishing solution for polishing treatment. In one embodiment, the etching and thinning step further comprises a lining plate attaching step of attaching the whole glass substrate to the rigid lining plate through optical cement. In one embodiment, the method further comprises a separation step of stripping the protective film blank and the lining plate before the silk-screen protective ink step. In one embodiment, the separation step is performed at an ambient temperature in the range of 20-25 ℃, a humidity in the range of 40-60%, a separation speed in the range of 10-30mm/s, and a peel angle in the range of 90-120. In one embodiment, the method further comprises a chemical strengthening step after the first polishing step, wherein the protective film blank subjected to the first polishing treatment is placed in molten alkali salt for ion exchange. In one embodiment, the method further comprises a second polishing step, wherein the reinforced protective film blank is placed in a second polishing solution for polishing, the pH value of the second polishing solution is larger than that of the first polishing solution, and the first polishing solution and the second polishing solution are respectively acidic polishing solutions. In one embodiment, in the second polishing step, the polishing temperature is in the range of 20 ℃ to 25 ℃, the polishing time is in the range of 30 seconds to 90 seconds, and the polishing depth is not more than 2 microns. In one embodiment, in the first polishing step, in the process of polishing the protective film blank by using the first polishing solution, vibration is assisted by megasonic waves, wherein the frequency range of the megasonic waves is 0.8-1.2MHz, the polishing time is 60-180 seconds, and the polishing depth is 2-3 micrometers. In one embodiment, the acidic passivation solution in the edge treatment step is a mixed aqueous solution comprising hydrofluoric acid, nitric acid and a buffer, the treatment temperature is 25-35 ℃, and the treatment time is 30-90 seconds. In one embodiment, the edge processing step further comprises a lamination step of laminating a plurality of protective film blanks and then placing the laminated protective film blanks in an