UTG ultra-thin glass composite protection paste for folding screen and preparation method of UTG ultra-thin glass composite protection paste

Abstract

The invention discloses a UTG ultrathin glass composite protection paste for a folding screen and a preparation method thereof, and the preparation method comprises the following steps: coating a thermoplastic polymer layer on a first release film, pre-curing, and tearing off the first release film to obtain a thermoplastic polymer film; the thermoplastic polymer film and the UTG ultra-thin glass are subjected to die cutting, sequentially and alternately laminated and then subjected to vacuum hot pressing composite forming; an OCA layer is attached to the thermoplastic polymer film layer on the outer side of one layer, and an AR layer and an AFHC layer are sequentially sprayed to the thermoplastic polymer film layer on the outer side of the other layer; and performing die cutting to obtain the UTG ultrathin glass composite protection paste for the folding screen. The thermoplastic polymer film layers are pressed on the two sides of the UTG ultra-thin glass layer, the technology is simple, the efficiency is high, the reject ratio is low, the UTG ultra-thin glass layer is enhanced, and the impact resistance of the UTG ultra-thin glass layer is improved; meanwhile, the AR layer and the AFHC layer are sprayed on the thermoplastic polymer film layer, so that the durability of the appearance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display protection films, and specifically relates to a UTG ultra-thin glass composite protection film for a folding screen and a preparation method thereof. Background Art

[0002] In order to protect the screen of a folding mobile phone, a PET (polyethylene terephthalate) / TAC (triacetyl cellulose) film protection film with a hardening coating is usually pasted on the screen cover plate of the folding mobile phone. In this way, when the surface of the mobile phone screen is worn, there is no need to replace the folding cover plate, and only the outermost protection film needs to be replaced, which is convenient, fast and low-cost.

[0003] However, as a protection film, since the PET / TAC film belongs to a polymer material and its modulus is about 6% of that of glass, and when forming the protection film, a very low-modulus OCA (optical adhesive) layer is laminated, not only does the plastic feeling on the screen surface is strong, but also after the folding screen is used for a period of time, appearance defects such as uneven surface, serious creases, and fingernail marks will appear.

[0004] Therefore, it is of great significance to research and develop a protection film with a glass texture, not easy to break, and not easy to produce unevenness, creases, fingernail marks and other appearance defects after use. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a UTG ultra-thin glass composite protection film for a folding screen and a preparation method thereof. By means of vacuum hot pressing technology, thermoplastic polymer film layers are coated on both sides of the UTG ultra-thin glass layer to enhance the UTG ultra-thin glass and improve its impact resistance; at the same time, an AR (anti-reflection) layer and an AFHC (anti-fingerprint hardening) layer are sprayed on the thermoplastic polymer film layer to avoid problems such as unevenness, creases and fingernail marks on the protection film after use for a period of time.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a preparation method of a UTG ultra-thin glass composite protection film for a folding screen, including the following steps:

[0007] S1. Coating a thermoplastic polymer layer on a first release film, and tearing off the first release film after pre-curing to obtain a thermoplastic polymer film;

[0008] S2. Die-cutting the thermoplastic polymer film and the UTG ultra-thin glass to obtain a thermoplastic polymer film layer and a UTG ultra-thin glass layer, sequentially and alternately laminating them and forming them into a composite by vacuum hot pressing; wherein, both outer sides after lamination are thermoplastic polymer film layers;

[0009] S3. Laminating an OCA layer on the thermoplastic polymer film layer on one outer side, and sequentially spraying an AR layer and an AFHC layer on the thermoplastic polymer film layer on the other outer side;

[0010] S4. Die-cutting to obtain the UTG ultra-thin glass composite protective film for the folding screen.

[0011] In the present invention, a thermoplastic polymer film is pre-coated and pre-cured on the first release film, with a uniform thickness (tolerance ±0.5um), and is formed by vacuum hot pressing and compounding with the UTG ultra-thin glass. The process is simple, efficient, and has a low defect rate. The process of the present invention avoids the problems of double-sided coating required in the traditional process of coating a thermoplastic polymer film on the surface of UTG ultra-thin glass, such as complex process, low efficiency, easy scratching of the surface of UTG ultra-thin glass, and uneven coating thickness.

[0012] In the present invention, thermoplastic polymer film layers are laminated on both sides of the UTG ultra-thin glass layer to strengthen the UTG ultra-thin glass layer and improve its impact resistance; at the same time, an AR layer and an AFHC layer are sprayed on the thermoplastic polymer film layer to improve its appearance durability and avoid problems such as unevenness, creases, and fingernail marks on the surface of the protective film after a period of use.

[0013] Further, the parameters of the vacuum hot pressing and compounding are: temperature 150 - 200°C, vacuum degree < -101.2 kPa, pressure 1 - 10 kg / cm 2 , and the pressure holding time is 5 - 15 min.

[0014] Further, the material of the thermoplastic polymer film layer is epoxy resin, with a light transmittance > 90% and a haze < 1%.

[0015] Further, the thickness of the thermoplastic polymer film layer is 10 - 30μm, and the thickness of the UTG ultra-thin glass layer is 10 - 50μm.

[0016] Further, the thickness of the AFHC layer is 5 - 15μm, the hardness > 3H, and the water contact angle > 110°.

[0017] Further, the thickness of the AR layer < 5μm, the light transmittance > 90%, and the haze < 1%.

[0018] Further, the thickness of the OCA layer is 15 - 50μm, and a second release film layer with a thickness of 50 - 100μm is provided on the outside of the OCA layer.

[0019] Further, in S2, the number of layers of the laminate is three or five.

[0020] Furthermore, the outer dimension of the thermoplastic polymer film layer is larger than that of the UTG ultra-thin glass layer, and the UTG ultra-thin glass layer is wrapped. After die-cutting in S4, the width of the thermoplastic polymer film layer on the outer periphery of the UTG ultra-thin glass layer is 0.1-0.5 mm. In the present invention, the UTG ultra-thin glass layer is wrapped by the thermoplastic polymer film layer to enhance the protection of the UTG ultra-thin glass, improve its impact resistance, and avoid the risk of edge breakage of the UTG ultra-thin glass layer.

[0021] The second aspect of the present invention provides a UTG ultra-thin glass composite protection film for a folding screen obtained by the preparation method described in the first aspect.

[0022] Advantages of the present invention:

[0023] In the present invention, thermoplastic polymer film layers are laminated on both sides of the UTG ultra-thin glass layer to enhance the UTG ultra-thin glass layer and improve its impact resistance; the UTG ultra-thin glass is wrapped by the thermoplastic polymer film layer to avoid edge breakage; at the same time, an AR layer and an AFHC layer are sprayed on the thermoplastic polymer film layer to improve its appearance durability.

[0024] In the present invention, the thermoplastic polymer film is coated and pre-cured on the release film in advance, and is compounded and formed with the UTG ultra-thin glass by vacuum hot pressing. The process is simple, efficient, and has a low defect rate, avoiding the problems of double-sided coating required in the traditional process of coating the thermoplastic polymer film on the surface of the UTG ultra-thin glass, complex process, low efficiency, easy scratching of the surface of the UTG ultra-thin glass, and uneven coating thickness. Description of the drawings

[0025] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the UTG ultra-thin glass composite protection film for a folding screen of the present invention;

[0027] Figure 2 It is a schematic structural diagram of another embodiment of the UTG ultra-thin glass composite protection film for a folding screen of the present invention. Detailed implementation manners

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] This embodiment provides a preparation method for a UTG ultra-thin glass composite protective film for a folding screen, comprising the following steps:

[0030] S1. Coat a thermoplastic polymer layer on the first release film, and after pre-curing, tear off the first release film to obtain a thermoplastic polymer film;

[0031] S2. Die-cut the thermoplastic polymer film and the UTG ultra-thin glass to obtain a thermoplastic polymer film layer and a UTG ultra-thin glass layer, stack them alternately in sequence and form them by vacuum hot pressing; wherein, both outer sides after stacking are thermoplastic polymer film layers;

[0032] S3. Bond an OCA layer on the thermoplastic polymer film layer on one outer side, and sequentially spray an AR layer and an AFHC layer on the thermoplastic polymer film layer on the other outer side;

[0033] S4. Die-cut to obtain the UTG ultra-thin glass composite protective film for the folding screen.

[0034] In this embodiment, the thermoplastic polymer film is pre-coated and pre-cured on the first release film, with uniform thickness, and is formed by vacuum hot pressing with the UTG ultra-thin glass. The process is simple, efficient, and has a low defect rate; thermoplastic polymer film layers are laminated on both sides of the UTG ultra-thin glass layer to strengthen the UTG ultra-thin glass layer and improve its impact resistance; the UTG ultra-thin glass is wrapped by the thermoplastic polymer film layer to prevent its edges from breaking; at the same time, an AR layer and an AFHC layer are sprayed on the thermoplastic polymer film layer to improve its appearance durability.

[0035] As a preferred embodiment, the parameters of the vacuum hot pressing are: temperature 150 - 200 °C, vacuum degree < -101.2 kPa, pressure 1 - 10 kg / cm 2 , and the pressure holding time is 5 - 15 min.

[0036] As a preferred embodiment, the material of the thermoplastic polymer film layer is epoxy resin, with a light transmittance > 90%, a haze < 1%; the thickness of the thermoplastic polymer film layer is 10 - 30 μm, and the thickness of the UTG ultra-thin glass layer is 10 - 50 μm; the thickness of the AFHC layer is 5 - 15 μm, the hardness > 3H, and the water contact angle > 110°; the thickness of the AR layer < 5 μm, the light transmittance > 90%, and the haze < 1%; the thickness of the OCA layer is 15 - 50 μm, and the OCA layer has a second release film layer with a thickness of 50 - 100 μm on its outer side.

[0037] As a preferred embodiment, in S2, the number of stacked layers is three (refer to Figure 1 ) or five (refer to Figure 2 ).

[0038] As a preferred embodiment, the outer dimensions of the thermoplastic polymer film layer are larger than those of the UTG ultra-thin glass layer, and the UTG ultra-thin glass layer is wrapped. The width of the thermoplastic polymer film layer on the outer periphery of the UTG ultra-thin glass layer is 0.1 - 0.5 mm. By wrapping the UTG ultra-thin glass layer with the thermoplastic polymer film layer, the protection of the UTG ultra-thin glass is enhanced, its impact resistance is provided, and at the same time, the risk of edge breakage of the UTG ultra-thin glass layer is avoided.

[0039] Another embodiment provides a UTG ultra-thin glass composite protective film for a folding screen prepared by the preparation method described in the above embodiment.

[0040] Example 1

[0041] (1) Coat a thermoplastic polymer (epoxy resin) layer on the first release film. After pre-curing, tear off the first release film to obtain a thermoplastic polymer film (30 μm);

[0042] (2) Die-cut the thermoplastic polymer film and the UTG ultra-thin glass (30 μm) to obtain a thermoplastic polymer film layer and a UTG ultra-thin glass layer. Stack them alternately in sequence (three layers) and form them by vacuum hot pressing. The parameters for hot pressing are: temperature 150 °C, vacuum degree < -101.2 kPa, pressure 5 kg / cm 2 , and the pressure holding time is 10 min;

[0043] (3) Bond an OCA layer (50 μm) on the thermoplastic polymer film layer on the outside of one layer, and sequentially spray an AR layer (3 μm) and an AFHC layer (10 μm) on the thermoplastic polymer film layer on the outside of the other layer.

[0044] Example 2

[0045] The difference between this example and Example 1 is that the lamination in step (2) is five layers, and other parameters and steps remain unchanged.

[0046] Comparative Example 1

[0047] The difference between this comparative example and Example 1 is that the UTG ultra-thin glass monomer is directly bonded to the OCA layer (50 μm), and the AR layer (3 μm) and the AFHC layer (10 μm) are sequentially sprayed.

[0048] Comparative Example 2

[0049] The difference between this comparative example and Example 1 is that a thermoplastic polymer film is only laminated on the side of the UTG ultra-thin glass close to the AR layer.

[0050] The obtained protective films in the examples and comparative examples were subjected to a ball-drop test. Among them, the UTG ultra-thin glass coated with a thermoplastic polymer film layer on both sides in Examples 1-2 did not break when the ball-drop height was 1500 mm. However, the single UTG ultra-thin glass in Comparative Example 1 started to break when the ball-drop height was 5 mm, and the UTG ultra-thin glass with a single-layer composite thermoplastic polymer film layer in Comparative Example 2 started to break when the ball-drop height was 950 mm.

[0051] The obtained protective films in the examples were subjected to a bending resistance test. Among them, the UTG ultra-thin glass coated with a thermoplastic polymer film layer on both sides in Examples 1-2 did not show any breakage when the bending radii were R1.5 mm and R2.0 mm.

[0052] In summary, in the present invention, a thermoplastic polymer film layer is laminated on both sides of the UTG ultra-thin glass layer to strengthen the UTG ultra-thin glass layer and improve its impact resistance; the UTG ultra-thin glass is wrapped with a thermoplastic polymer film layer to prevent its edge from breaking; at the same time, an AR layer and an AFHC layer are sprayed on the thermoplastic polymer film layer to improve its appearance durability; the thermoplastic polymer film is coated and pre-cured on the release film in advance and then compounded with the UTG ultra-thin glass by vacuum hot pressing. The process is simple, efficient, and has a low defect rate, avoiding the problems of double-sided coating required in the traditional process of coating a thermoplastic polymer film on the surface of UTG ultra-thin glass, such as complex process, low efficiency, easy scratching of the surface of UTG ultra-thin glass, and uneven coating thickness.

[0053] The present invention has been described in detail above in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting the present invention. Those skilled in the art understand that without departing from the spirit and scope of the present invention, various equivalent substitutions, modifications, or improvements can be made to the technical solutions and their implementation manners of the present invention, and these all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims

1. A method for preparing a UTG ultra-thin glass composite protective film for a folding screen, characterized in that: The steps include: S1, coating a thermoplastic polymer layer on a first release film, and tearing off the first release film after pre-curing to obtain a thermoplastic polymer film; S2, die-cutting the thermoplastic polymer film and the UTG ultra-thin glass to obtain a thermoplastic polymer film layer and a UTG ultra-thin glass layer, stacking them alternately in sequence and performing composite molding by vacuum hot pressing; wherein both outer sides after stacking are thermoplastic polymer film layers; S3, laminating an OCA layer on one of the outer thermoplastic polymer film layers, and sequentially spraying an AR layer and an AFHC layer on the other outer thermoplastic polymer film layer; S4. Die-cutting to obtain the UTG ultra-thin glass composite protective film for the folding screen.

2. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The parameters of the vacuum hot pressing composite molding are: temperature 150-200°C, vacuum degree <-101.2kPa, pressure 1-10kg / cm 2 , the holding time is 5-15min.

3. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The material of the thermoplastic polymer film layer is epoxy resin, with a light transmittance greater than 90% and a haze less than 1%.

4. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The thickness of the thermoplastic polymer film layer is 10-30 μm, and the thickness of the UTG ultra-thin glass layer is 10-50 μm.

5. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The AFHC layer has a thickness of 5-15 μm, a hardness of more than 3H, and a water drop angle of more than 110°.

6. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The AR layer has a thickness of less than 5 μm, a light transmittance of more than 90%, and a haze of less than 1%.

7. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The thickness of the OCA layer is 15-50 μm, and the outer side of the OCA layer is provided with a second release film layer with a thickness of 50-100 μm.

8. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: In S2, the number of layers of the stack is three or five.

9. The method for preparing the UTG ultra-thin glass composite protective film for folding screen according to claim 1, characterized in that: The thermoplastic polymer film layer has an outer dimension larger than that of the UTG ultra-thin glass layer, and wraps the UTG ultra-thin glass layer. After S4 die-cutting, the width of the thermoplastic polymer film layer around the UTG ultra-thin glass layer is 0.1-0.5 mm.

10. A UTG ultra-thin glass composite protective film for a folding screen prepared by the preparation method according to any one of claims 1 to 9.

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