Barrier film and preparation method thereof

Abstract

The invention discloses a barrier film, which comprises a PEN film layer, a SPA resin layer, a PC film layer, an adhesive layer and a protective film layer in sequence. The barrier film has excellent performance of blocking water vapor and oxygen, thereby effectively improving the service life of OLED.

Description

Technical Field

[0001] The invention belongs to the technical field of membranes, and in particular relates to a barrier membrane and a preparation method thereof. Background Art

[0002] With the rapid development of the mobile phone industry and display technology, traditional LCD technology is slowly being replaced by OLED technology. Compared with LCD, OLED has better display effects and lower power consumption, while making the screen flexible and foldable. However, compared with LCD, OLED is extremely sensitive to water vapor. In order to ensure the luminous efficiency and service life of OLED, OLED must pay great attention to the isolation of water vapor and oxygen during the packaging process. The barrier film's isolation performance against water vapor and oxygen is directly related to the service life of OLED.

[0003] The existing barrier films have only general isolation properties against water vapor and oxygen and cannot meet the requirements of the rapid development of OLEDs. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a barrier film and a preparation method thereof, wherein the barrier film has excellent water vapor and oxygen barrier properties, thereby effectively improving the service life of OLED.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A barrier film comprises a PEN film layer, a SPA resin layer, a PC film layer, an adhesive layer and a protective film layer in sequence.

[0007] Preferably, the SPA resin layer is formed by bonding the SPA resin between the PEN film layer and the PC film layer using OCA optical adhesive and curing the bonded SPA resin.

[0008] Preferably, the average particle size of the SPA resin is 0.5-20 μm, and the specific surface area is 5-25 m 2 / g.

[0009] Preferably, the adhesive in the adhesive layer is OCA optical adhesive.

[0010] Preferably, the protective film layer is a PET release film.

[0011] Preferably, the thickness of the PEN film layer is 10-25 μm.

[0012] Preferably, the PC film layer has a thickness of 15-35 μm.

[0013] Preferably, the thickness of the SPA resin layer is 10-15 μm.

[0014] Preferably, the thickness of the adhesive layer is 5-10 μm.

[0015] Preferably, the thickness of the protective film layer is 15-20 μm.

[0016] Another object of the present invention is to provide a method for preparing the above barrier film:

[0017] A method for preparing the barrier film as described above comprises the following steps:

[0018] (1) Apply a SPA resin layer on the surface of the PEN film layer;

[0019] (2) Laminating the PC film layer on the SPA resin layer;

[0020] (3) Apply an adhesive layer on the surface of the PC film layer;

[0021] (4) A protective film layer is attached to the adhesive layer.

[0022] The beneficial effects of the present invention are:

[0023] (1) The PEN film in the PEN film layer of the barrier film of the present invention has the characteristics of high crystallinity and high density. At the same time, due to the presence of a more rigid naphthalene ring in its molecular structure, it has a strong barrier ability to water vapor and oxygen. At the same time, the molecular chain of the PC film in the PC film layer contains carboxyl groups, which increases the interaction between molecules and makes the molecular chains more densely stacked, thereby having an excellent ability to isolate oxygen and water vapor. In addition, due to the presence of the SPA resin layer, a very small amount of water vapor that passes through the PEN film layer is absorbed in the SPA resin layer and will not diffuse into the PC film layer to affect the molecular chain structure of the PC film, thereby ensuring that the barrier film has an extremely excellent barrier effect against both water vapor and oxygen.

[0024] (2) The average particle size of the SPA resin in the SPA resin layer of the barrier film of the present invention is 0.5-20 μm, and the specific surface area is 5-25 m 2 / g, which makes the barrier film have better water vapor barrier, oxygen barrier performance and light transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 Schematic diagram of the barrier film of Example 1 of the present invention.

[0027] Reference numerals:

[0028] 100. PEN film layer; 200. SPA resin layer; 300. PC film layer; 400. Adhesive layer; 500. Protective film layer. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, a barrier film comprises a PEN film layer 100, a SPA resin layer 200, a PC film layer 300, an adhesive layer 400 and a protective film layer 500 in sequence, wherein the SPA resin layer 200 is formed by bonding the SPA resin between the PEN film layer and the PC film layer with OCA optical adhesive and curing, and the average particle size of the SPA resin is 0.5 μm and the specific surface area is 5 m 2 / g, the adhesive in the SPA resin layer 200 and the adhesive layer 400 are both OCA optical adhesives, and the protective film layer 500 is a PET release film, wherein the thickness of the PEN film layer 100 is 10μm, the thickness of the SPA resin layer 200 is 10μm, the thickness of the PC film layer 300 is 15μm, the thickness of the adhesive layer 400 is 5μm, and the thickness of the protective film layer 500 is 15μm.

[0032] The method for preparing the barrier film comprises the following steps:

[0033] (1) Apply OCA optical glue mixed with SPA resin on the surface of PEN film;

[0034] (2) Laminating the PC film on the OCA optical adhesive mixed with SPA resin;

[0035] (3) Apply OCA optical glue on the surface of PC film;

[0036] (4) Attach the PET release film to the OCA optical adhesive.

[0037] Embodiment 2:

[0038] The difference compared with Example 1 is that the average particle size of the SPA resin is 20 μm and the specific surface area is 25 m 2 / g, the thickness of the PEN film layer is 25μm, the thickness of the SPA resin layer is 15μm, the thickness of the PC film layer is 35μm, the thickness of the adhesive layer is 10μm, and the thickness of the protective film layer is 20μm.

[0039] Embodiment 3:

[0040] The difference compared with Example 1 is that the average particle size of the SPA resin is 12 μm and the specific surface area is 16 m 2 / g, the thickness of the PEN film layer is 20μm, the thickness of the SPA resin layer is 12μm, the thickness of the PC film layer is 25μm, the thickness of the adhesive layer is 6μm, and the thickness of the protective film layer is 16μm.

[0041] Embodiment 4:

[0042] The difference from Example 1 is that the average particle size of the SPA resin is 2 μm and the specific surface area is 20 m 2 / g, the thickness of the PEN film layer is 15μm, the thickness of the SPA resin layer is 11μm, the thickness of the PC film layer is 20μm, the thickness of the adhesive layer is 7μm, and the thickness of the protective film layer is 20μm.

[0043] Embodiment 5:

[0044] The difference from Example 3 is that the average particle size of the SPA resin in the barrier film of Example 5 is 0.4 μm, and the specific surface area is 4.9 m 2 / g.

[0045] Embodiment 6:

[0046] The difference compared with Example 3 is that the average particle size of the SPA resin in the barrier film of Example 6 is 20.2 μm, and the specific surface area is 25.3 m 2 / g.

[0047] Embodiment 7:

[0048] The difference compared with Example 3 is that the average particle size of the SPA resin in the barrier film of Example 7 is 0.4 μm, and the specific surface area is 25.3 m 2 / g.

[0049] Embodiment 8:

[0050] The difference compared with Example 3 is that the average particle size of the SPA resin in the barrier film of Example 8 is 20.2 μm, and the specific surface area is 4.9 m 2 / g.

[0051] Comparative Example 1:

[0052] The difference compared with Example 3 is that the barrier film of Comparative Example 1 does not contain SPA resin.

[0053] Test example:

[0054] The barrier films of Examples 1-8 and Comparative Example 1 were tested for water vapor transmission rate, oxygen transmission rate and light transmittance, respectively. The protective film layer of the barrier film was removed before the test. The test results are shown in Table 1.

[0055] Table 1. Barrier film performance test results of Examples 1-8 and Comparative Example 1

[0056]

[0057] As can be seen from Table 1, the barrier film of the present application has the performance of blocking water vapor and oxygen, and its water vapor transmission rate is 2*10 -6 g / m 2 / day, at least 0.96*10 -6 g / m 2 / day, its oxygen permeability is 2*10 -5 cm 3 / m 2 / day, at least 1.02*10 -5 cm 3 / m 2 / day, and its light transmittance is above 80%, and can reach up to 95.6%.

[0058] Comparing Example 3 with Examples 5-8, it can be seen that when the average particle size of the SPA resin in the SPA resin layer is in the range of 0.5-20 μm and the specific surface area is in the range of 5-25 m 2 / g, it has more excellent water vapor barrier, oxygen barrier performance and light transmittance.

[0059] By comparing Example 3 with Comparative Example 1, it can be seen that when the barrier film does not contain SPA resin, the barrier film's ability to block water vapor and oxygen will be greatly reduced and its light transmittance will also be greatly reduced.

[0060] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A barrier film, characterized in that: The invention comprises a PEN film layer, a SPA resin layer, a PC film layer, an adhesive layer and a protective film layer in sequence; the SPA resin layer is formed by bonding the SPA resin between the PEN film layer and the PC film layer with OCA optical glue and curing; the average particle size of the SPA resin is 0.5-20 μm, and the specific surface area is 5-25 m 2 / g.

2. A barrier film according to claim 1, characterized in that: The adhesive in the adhesive layer is OCA optical adhesive.

3. The barrier film according to claim 1, characterized in that: The protective film layer is a PET release film.

4. The barrier film according to claim 1, characterized in that: The thickness of the PEN film layer is 10-25 μm.

5. The barrier film according to claim 1, characterized in that: The thickness of the PC film layer is 15-35 μm.

6. The barrier film according to claim 1, characterized in that: The thickness of the SPA resin layer is 10-15 μm.

7. The barrier film according to claim 1, characterized in that: The thickness of the adhesive layer is 5-10 μm.

8. The method for preparing a barrier film according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Apply a SPA resin layer on the surface of the PEN film layer; (2) Laminating the PC film layer on the SPA resin layer; (3) Apply an adhesive layer on the surface of the PC film layer; (4) A protective film layer is attached to the adhesive layer.

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