A double barrier layer silicone oil transfer resistant release film

Abstract

The utility model belongs to the release film technical field, concretely relates to a double barrier layer silicone oil anti -transfer release film, including PET base material layer, the both sides of PET base material layer are provided with first barrier layer and second barrier layer respectively, one side of first barrier layer away from PET base material layer is equipped with the concave -convex structure that continuously and evenly distributes, be provided with the corona layer on first barrier layer, be provided with heavy silicone oil layer on the corona layer, one side of second barrier layer away from PET base material layer is equipped with the corrugated surface, be provided with light silicone oil layer on the corrugated surface. Through the setting of above -mentioned component, effectively prevent release agent transfer.

Description

Technical Field

[0001] This utility model belongs to the field of release film technology, specifically relating to a double-barrier layer silicone oil anti-transfer release film. Background Technology

[0002] Double-sided release film, as an important functional material, is widely used in electronics manufacturing, optical displays, new energy, and other fields. Its structure typically uses materials such as PET as the base material, with light and heavy release force release layers formed on the top and bottom surfaces respectively. Protective films, optical films, etc., can be adhered to the two release layers respectively. This differentiated release force design can meet the needs of different stages in the process. For example, the light release force side allows for easy peeling during use, while the heavy release force side firmly fixes the film material during transportation and storage, preventing adhesion or detachment.

[0003] However, this structure has significant drawbacks in practical applications. Due to the large difference in release forces on both sides, during operations such as film peeling and winding, the release agent easily migrates from the side with high release force to the adhesive layer or the side with low release force due to uneven stress. On the one hand, release agent migration causes changes in the release forces on both sides of the release film. The release force on the side with low release force increases due to release agent migration, making it difficult to peel off the film, while the release force on the side with high release force decreases, causing the film to detach prematurely. On the other hand, after the release agent migrates to the adhesive layer, it will damage the adhesive properties, light transmittance, and other properties of the adhesive layer, affecting product quality. For example, in the OCA optical adhesive bonding of mobile phone screens, release agent migration may cause bubbles and reduced adhesion of the film, seriously affecting product yield. Utility Model Content

[0004] The purpose of this invention is to provide a double-barrier silicone oil anti-transfer release film, which aims to solve the technical problem of release agent transfer after stress in existing double-sided release films with large differences in release forces on both sides.

[0005] To achieve the above objectives, this utility model provides a double-barrier silicone oil anti-transfer release film, comprising a first barrier layer and a second barrier layer respectively disposed on both sides of a PET substrate layer. The side of the first barrier layer away from the PET substrate layer has a continuously and uniformly distributed concave-convex structure. A corona layer is disposed on the first barrier layer, and a heavy silicone oil layer is disposed on the corona layer. The side of the second barrier layer away from the PET substrate layer has a corrugated surface, and a light silicone oil layer is disposed on the corrugated surface.

[0006] Preferably, the continuous and uniformly distributed uneven structure on the side of the first barrier layer away from the PET substrate layer consists of multiple bumps. The bumps are cuboid structures with a height of 3-8 micrometers, a bottom length and width of 10-20 micrometers, and a spacing of 20-50 micrometers between adjacent bumps.

[0007] Preferably, the first barrier layer is a silica sol layer, and the thickness of the silica sol layer is 0.5-2 micrometers.

[0008] Preferably, the corrugated surface is composed of continuous isosceles triangular peaks and troughs, with peak height and trough depth both being 5-10 micrometers and wavelength being 20-50 micrometers.

[0009] Preferably, the second barrier layer is provided with a corona layer, which is formed on the second barrier layer by corona discharge, and the thickness of the corona layer is 5-12 micrometers.

[0010] Preferably, the surface of the corona layer near the heavy silicone oil layer is coated with a primer containing active groups.

[0011] Preferably, the heavy-duty silicone oil layer is a long-chain alkyl-modified silicone oil layer.

[0012] Preferably, the second barrier layer is a PVA coating with a thickness of 0.3-1 micrometer.

[0013] Preferably, a silane coupling agent transition layer is provided between the PVA coating and the light silicone oil layer.

[0014] Preferably, the thickness of the PET substrate layer is 50 micrometers to 100 micrometers.

[0015] The above-mentioned technical solutions of one or more of the double-barrier layer silicone oil anti-transfer release film provided in this embodiment of the utility model have at least one of the following technical effects: This anti-transfer release film effectively solves the problem of release agent migration caused by the difference in release force in traditional double-sided release films, and significantly improves the reliability of film materials and product yield in scenarios such as electronic manufacturing and optical display. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A side view of a double-barrier silicone oil anti-transfer release film provided for an embodiment of this utility model.

[0018] Figure 2 An exploded view of a double-barrier silicone oil anti-transfer release film provided for an embodiment of this utility model.

[0019] The following are the labeling elements in the figure: 10—PET substrate layer; 20—First barrier layer; 21—Bump; 30—Corona layer; 40—Heavy-duty silicone oil layer; 50—Second barrier layer; 60—Light-duty silicone oil layer. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0024] In one embodiment of this utility model, such as Figure 1 , 2 As shown, a dual-barrier silicone oil anti-transfer release film is provided, including a PET substrate layer 10, the thickness of which is 50 micrometers to 100 micrometers.

[0025] A first barrier layer 20 and a second barrier layer 50 are respectively provided on both sides of the PET substrate layer 10. The side of the first barrier layer 20 away from the PET substrate layer 10 has a continuously and uniformly distributed concave-convex structure. A corona layer 30 is provided on the first barrier layer 20, and a heavy silicone oil layer 40 is provided on the corona layer 30. The side of the second barrier layer 50 away from the PET substrate layer 10 has a corrugated surface, and a light silicone oil layer 60 is provided on the corrugated surface of the second barrier layer 50.

[0026] The PET substrate layer 10 is pretreated with corona discharge to achieve a surface energy of 41-47 mN / m, thereby enhancing its adhesion to the first and second barrier layers. The haze of the PET substrate layer is less than 1%, and its light transmittance is greater than 90%.

[0027] The first barrier layer 20 is a silica sol layer with a thickness of 0.5-2 micrometers. It is formed on the surface of the PET substrate layer 10 by dip coating or spray coating. The silica sol layer contains uniformly dispersed silica nanoparticles with a particle size of 50-200 nanometers, which are used to improve the barrier performance against silicone oil.

[0028] The first barrier layer 20 has a continuous and uniformly distributed uneven structure on the side away from the PET substrate layer 10, which is formed by a plurality of continuously and uniformly distributed bumps 21. The bumps 21 are cuboid structures with a height of 3-8 micrometers, a bottom length and width of 10-20 micrometers, and a spacing of 20-50 micrometers between adjacent bumps 21.

[0029] The design of the bump 21 increases the contact area between the first barrier layer 20 and the corona layer 30, effectively dispersing the tear stress and reducing the risk of migration of the heavy silicone oil release agent to the PET substrate.

[0030] The corona layer has a thickness of 5-12 micrometers. The corona layer 30 is formed on the first barrier layer 20 by corona discharge, and its surface energy reaches 45-55 mN / m, which enhances the bonding force with the heavy silicone oil layer.

[0031] The corona layer 30 and the heavy silicone oil layer 40 are connected by chemical bonding. The chemical bonding is formed by coating the surface of the corona layer 30 near the heavy silicone oil layer 40 with a primer containing active groups, which reacts with the active ingredients of the heavy silicone oil layer 40.

[0032] The heavy-duty silicone oil layer 40 is a long-chain alkyl-modified silicone oil, which is prepared by hydrosilylation reaction of hydrogen-containing silicone oil and long-chain olefins. The long-chain alkyl-modified silicone oil can be obtained commercially, and Hubei Longsheng Sihai New Materials Co., Ltd. sells this product.

[0033] The release force of the long-chain alkyl modified silicone oil is 1.2-1.5 N / 25 mm. This release force is controlled by adjusting the coating amount and crosslinking degree of the long-chain alkyl modified silicone oil. The coating amount of the long-chain alkyl modified silicone oil is 1.5-2.5 g / m², and it is cured at 120-150℃ for 2-5 minutes.

[0034] The carbon chain length of the long-chain alkyl modified silicone oil is C18-C20. The long-chain alkyl can reduce the surface energy of the silicone oil and improve the release effect. In addition, the steric hindrance effect of the long-chain alkyl can inhibit the migration of silicone oil molecules to the adhesive layer.

[0035] The second barrier layer 50 is a polyvinyl alcohol (PVA) coating with a thickness of 0.3-1 micrometer. The PVA coating is applied to the surface of the PET substrate layer 10 by means of an aqueous solution and forms a continuous and dense film after drying. A silane coupling agent transition layer is provided between the PVA coating and the light silicone oil layer 60 to enhance the bonding force between the two.

[0036] The second barrier layer 50 has a corrugated surface on the side away from the PET substrate layer 10. The corrugated surface is composed of continuous isosceles triangular peaks and troughs, with a peak height and trough depth of 5-10 micrometers and a wavelength of 20-50 micrometers.

[0037] The isosceles triangular structure of the corrugated surface can adjust the uniformity of the coating thickness of the lightweight silicone oil layer 60, thereby reducing the fluctuation range of the release force of the lightweight silicone oil layer 60.

[0038] The corrugated surface and the lightweight silicone oil layer 60 achieve a stable bond through physical adsorption and microstructure integration. The surface roughness Ra of the corrugated surface is 0.5-2μm, which enhances the adhesion between the corrugated surface and the lightweight silicone oil layer 60.

[0039] The lightweight silicone oil layer 60 is a UV fluorosilicone oil curing layer with a thickness of 0.3-0.8 micrometers. The UV fluorosilicone oil curing layer is formed on the corrugated surface by a UV light curing process. The light intensity of the UV light curing process is 800-1200 mJ / cm², and the curing time is 1-3 seconds. The surface energy of the UV fluorosilicone oil curing layer is less than 20 mN / m, and it has excellent anti-stick properties.

[0040] The release force of the UV-cured fluorosilicone oil layer is 0.3-0.6 N / 25 mm. The working principle of this invention is as follows: The PET substrate layer 10 undergoes corona pretreatment to form a strong adhesion interface with the first barrier layer 20 and the second barrier layer 50, avoiding stress concentration caused by interlayer peeling. The uniformly dispersed 50-200 nanometer silica particles inside the first barrier layer 20 form a mesh barrier, which physically prevents the release agent of the heavy silicone oil layer 40 from migrating to the substrate; at the same time, the cuboid protrusions 21 on the surface increase the contact area with the corona layer 30, and reduce the risk of release agent diffusion to the low release force side due to uneven stress during the film peeling process by dispersing stress.

[0041] The second barrier layer 50, with its corrugated surface, precisely controls the uniformity of the coating thickness of the lightweight silicone oil layer 60 through microstructure interlocking. Combined with the enhanced physical adsorption force due to surface roughness, it prevents the lightweight silicone oil layer 60 from shifting or the release agent from penetrating into the substrate during the winding process.

[0042] The corona layer 30 enables the first barrier layer 20 and the heavy silicone oil layer 40 to form a covalent connection through chemical bonding, rather than simple physical adsorption, thereby significantly inhibiting the diffusion of silicone oil molecules into the interior of the corona layer 30.

[0043] The heavy-duty silicone oil layer 40 hinders the movement of silicone oil molecular chains through steric hindrance, reducing its migration activity; at the same time, the cross-linked network formed by the hydrosilylation reaction enhances the cohesive strength of the silicone oil layer. With the control of coating amount and curing conditions, the release force is stabilized at 1.2-1.5N / 25mm.

[0044] The lightweight silicone oil layer 60 forms a dense coating through a photocuring process, exhibiting excellent anti-stick properties. Simultaneously, the microstructure integration with the PVA corrugated surface and the chemical bridging effect of the silane coupling agent transition layer ensure that the lightweight silicone oil layer 60 maintains stable adhesion even under low release force, preventing the release agent from migrating due to weak interfacial bonding.

[0045] Through a triple mechanism of "physical barrier + chemical anchoring + microstructure stress dispersion", this utility model effectively solves the problem of release agent migration caused by the difference in release force in traditional double-sided release films, and improves the reliability and yield of film materials in scenarios such as electronic manufacturing and optical display.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-barrier layer silicone oil anti-transfer release film, characterized in that: The material includes a PET substrate layer, on both sides of which a first barrier layer and a second barrier layer are respectively provided. The side of the first barrier layer away from the PET substrate layer has a continuously and uniformly distributed uneven structure. A corona layer is provided on the first barrier layer, and a heavy-duty silicone oil layer is provided on the corona layer. The side of the second barrier layer away from the PET substrate layer has a corrugated surface, and a light-duty silicone oil layer is provided on the corrugated surface.

2. The dual-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The first barrier layer has a continuous and uniformly distributed uneven structure on the side away from the PET substrate layer, which consists of multiple bumps. The bumps are cuboid structures with a height of 3-8 micrometers, a bottom length and width of 10-20 micrometers, and a spacing of 20-50 micrometers between adjacent bumps.

3. The double-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The first barrier layer is a silica sol layer, and the thickness of the silica sol layer is 0.5-2 micrometers.

4. The double-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The corrugated surface is composed of continuous isosceles triangular peaks and troughs, with peak height and trough depth both being 5-10 micrometers and wavelength being 20-50 micrometers.

5. The double-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The first barrier layer is provided with a corona layer, which is formed on the first barrier layer by corona discharge, and the thickness of the corona layer is 5-12 micrometers.

6. The dual-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The corona layer is coated with a primer containing active groups on the surface near the heavy silicone oil layer.

7. The dual-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The heavy-duty silicone oil layer is a long-chain alkyl-modified silicone oil layer.

8. The dual-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The second barrier layer is a PVA coating with a thickness of 0.3-1 micrometer.

9. The dual-barrier layer silicone oil anti-transfer release film according to claim 8, characterized in that: A silane coupling agent transition layer is provided between the PVA coating and the light silicone oil layer.

10. The double-barrier layer silicone oil anti-transfer release film according to claim 1, characterized in that: The thickness of the PET substrate layer is 50 micrometers to 100 micrometers.

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