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CN-224199313-U - Bending-resistant OCA optical adhesive film for folding screen

CN224199313UCN 224199313 UCN224199313 UCN 224199313UCN-224199313-U

Abstract

The utility model discloses a bending-resistant OCA optical adhesive film for a folding screen, which comprises a PDMS film, one side of the PDMS film is provided with a first OCA adhesive layer, and the other side of the PDMS film is provided with a second OCA adhesive layer. The PDMS film and the silica gel OCA in the utility model both take a silicon-oxygen bond (Si-O-Si) as a main chain, and have consistent optical performance. Meanwhile, the PDMS molecular chain has excellent flexibility, can endow the material with low glass transition temperature (about-123 ℃) and high elasticity, and the elongation at break can generally reach 100% -1000%, so that the PDMS molecular chain not only far exceeds that of the acrylic material, but also exceeds that of the common silica gel OCA. The utility model creatively combines the two, gives the product excellent bending resistance, greatly reduces the cost compared with a pure silica gel OCA adhesive film, and simultaneously maintains the characteristics of good high and low temperature resistance, ultraviolet resistance and yellowing resistance of the silica gel OCA.

Inventors

  • ZHANG LEI
  • HUANG BINQING

Assignees

  • 深圳市亚微新材料有限公司

Dates

Publication Date
20260505
Application Date
20250530

Claims (14)

  1. 1. A bending-resistant OCA optical adhesive film for a folding screen is characterized by comprising a PDMS film (1), wherein a first OCA adhesive layer (2) is arranged on one side of the PDMS film (1), and a second OCA adhesive layer (3) is arranged on the other side of the PDMS film (1).
  2. 2. The bending-resistant OCA optical adhesive film for a folding screen according to claim 1, wherein the hardness of the PDMS film (1) ranges from Shore A0 to 80, and the thickness of the PDMS film (1) ranges from 5 mu m to 500 mu m.
  3. 3. The bending-resistant OCA optical adhesive film for a folding screen according to claim 2, wherein the thickness of the PDMS film (1) is 20-200 μm.
  4. 4. The bending-resistant OCA optical adhesive film for a folding screen as claimed in claim 1, wherein the first OCA adhesive layer (2) and the second OCA adhesive layer (3) are made of organic silicon optical transparent adhesive.
  5. 5. The bending-resistant OCA optical adhesive film for a folding screen according to claim 1, wherein the thickness of the first OCA adhesive layer (2) and the second OCA adhesive layer (3) is 10-500 μm.
  6. 6. The bending-resistant OCA optical adhesive film for a folding screen according to claim 5, wherein the thickness of the first OCA adhesive layer (2) and the second OCA adhesive layer (3) is 20-300 μm.
  7. 7. The bending-resistant OCA optical adhesive film for a folding screen according to claim 1, wherein a light release film (4) is arranged on the outer side of the first OCA adhesive layer (2).
  8. 8. The bending-resistant OCA optical adhesive film for a folding screen of claim 7, wherein the release force of the light release film (4) ranges from 1 to 30gf/25mm, and the light release film (4) is an organosilicon release film, a fluorine release film or a non-silicon release film.
  9. 9. The bending-resistant OCA optical adhesive film for a folding screen according to claim 7, wherein the thickness of the light release film (4) is 5-200 μm.
  10. 10. The bending-resistant OCA optical adhesive film for a folding screen according to claim 9, wherein the thickness of the light release film (4) is 25-100 μm.
  11. 11. The bending-resistant OCA optical adhesive film for a folding screen according to claim 1, wherein a heavy release film (5) is arranged on the outer side of the second OCA adhesive layer (3).
  12. 12. The bending-resistant OCA optical adhesive film for a folding screen of claim 11, wherein the heavy release film (5) is an organic silicon release film, a fluorine release film or a non-silicon release film, and the release force of the heavy release film (5) is 20-300 gf/25 mm.
  13. 13. The bending-resistant OCA optical adhesive film for a folding screen according to claim 11, wherein the thickness of the heavy release film (5) is 5-200 μm.
  14. 14. The bending-resistant OCA optical adhesive film for a folding screen according to claim 13, wherein the thickness of the heavy release film (5) is 25-100 μm.

Description

Bending-resistant OCA optical adhesive film for folding screen Technical Field The utility model discloses an optical adhesive film, in particular relates to a bending-resistant OCA optical adhesive film for a folding screen, and belongs to the technical field of electronic product accessories. Background OCA optical cement (OpticallyClearAdhesive) is an optical-grade adhesive material with high light transmittance and high adhesive strength, and is mainly used for laminating processes of electronic equipment such as touch screens, display screens, camera modules and the like, and can replace the traditional air layer, reduce light refraction, improve display effect and enhance structural strength. Folding screen mobile phones are new and expensive in mobile phones, and are sought after by the majority of mobile phone users since ask oneself. OCA optical cement is used in the touch screen of a folding screen mobile phone for attaching TP and LCM, because the folding screen mobile phone is required to be frequently bent (usually required to support more than one million times of bending) in the use process, the OCA optical cement provides a challenge of higher dimension for the performance of the OCA, the OCA used in the folding screen mobile phone can only bear more than or equal to 20 ten thousand times of bending (bending radius is less than or equal to 3 mm), and the glue layer is not broken, layered or deteriorated in optical performance. In the prior art, the conventional OCA optical adhesive is usually pure acrylic acid OCA, and a pure acrylic acid adhesive layer is easy to generate microcracks after being bent for fifty thousand times (because of the lack of elasticity of a molecular chain crosslinking structure), so that the haze is increased or the light transmittance is reduced, and stress relaxation is obvious (i.e. "creep") after being bent for a long time, so that the crease of a screen is deepened or uneven. Meanwhile, ester groups in the acrylic acid molecular chain are easy to be attacked by ultraviolet rays and damp heat, oxidation chain scission occurs, and yellowing is caused. In addition, the glass transition temperature (Tg) of the acrylic OCA is about-20 ℃, the adhesive layer is easy to become brittle in a low-temperature environment, cracking is caused, and the modulus is reduced at high temperature (60 ℃) and the adhesive overflow at the edge of a screen is possibly caused. Although the silica gel OCA solves the problems of poor bending property, yellowing resistance, high and low temperature and the like of the acrylic acid OCA to a certain extent. However, silica OCAs still have disadvantages in terms of bending resistance. Meanwhile, silica gel OCA is expensive, and the cost is about twice that of acrylic acid OCA. Disclosure of Invention In order to overcome the defect of poor bending resistance of the OCA optical adhesive in the prior art, the utility model provides a bending-resistant OCA optical adhesive film for a folding screen, which is endowed with excellent bending-resistant characteristics by combining a PDMS film and a silica gel OCA. The technical scheme is that the bending-resistant OCA optical adhesive film for the folding screen comprises a PDMS film, wherein a first OCA adhesive layer is arranged on one side of the PDMS film, and a second OCA adhesive layer is arranged on the other side of the PDMS film. The technical scheme adopted by the utility model for solving the technical problems further comprises the following steps: The hardness of the PDMS film ranges from Shore A0 to 80, the thickness of the PDMS film is 5-500 mu m, and the thickness of the PDMS film is 20-200 mu m. The first OCA adhesive layer and the second OCA adhesive layer adopt organic silicon optical transparent adhesive. The thickness of the first OCA adhesive layer and the second OCA adhesive layer is 10-500 mu m, and preferably, the thickness of the first OCA adhesive layer and the second OCA adhesive layer is 20-500 mu m. The outside of first OCA glue film be equipped with light release film. The release force range of the light release film is 1-30 gf/25mm, and the light release film adopts an organic silicon release film, a fluorine release film or a non-silicon release film. The thickness of the light release film is 5-200 mu m, and the preferable thickness of the light release film is 25-100 mu m. And a heavy release film is arranged on the outer side of the second OCA adhesive layer. The release force range of the heavy release film is 20-300 gf/25mm, and the heavy release film adopts an organic silicon release film, a fluorine release film or a non-silicon release film. The thickness of the heavy release film is 5-200 mu m, and the thickness of the heavy release film is 25-100 mu m. The utility model has the beneficial effects that the PDMS film and the silica gel OCA both take silicon-oxygen bond (Si-O-Si) as main chains, and have consistent optical performance. Meanwhile, the PDMS mol