Double-sided tape

Abstract

The utility model provides a double -sided tape. The double -sided tape includes: carrier layer, first adhesive layer and second adhesive layer. First adhesive layer is attached to the first surface of carrier layer, and second adhesive layer is attached to the second surface of carrier layer opposite to the first surface. The carrier layer physically isolates the first adhesive layer and the second adhesive layer. The first adhesive in the first adhesive layer is initiated by the first initiator to initiate the solidification of the second adhesive in the second adhesive layer by the second initiator. The carrier layer is configured to prevent the first initiator from initiating the solidification of the second adhesive in the second adhesive layer through the carrier layer and to prevent the second initiator from initiating the solidification of the first adhesive in the first adhesive layer through the carrier layer. The double -sided tape provided by the utility model can activate the adhesives on both sides of the carrier layer respectively.

Description

Technical Field

[0001] This utility model relates to a double-sided adhesive tape. Background Technology

[0002] Double-sided tape is increasingly widely used in industrial fields and daily life, gradually replacing mechanical connection methods such as welding and riveting. In particular, double-sided tapes that cure adhesives using initiators undergo a chemical reaction under the initiator's influence, transforming the originally liquid or semi-solid adhesive layer into a solid cross-linked network structure, thus achieving curing. These types of double-sided tapes exhibit high and long-lasting bonding strength after curing and are widely used in industrial applications requiring high bonding strength, durability, temperature resistance, or chemical resistance.

[0003] Ideally, for these types of double-sided tapes to achieve optimal bonding performance, the initiator-initiated adhesive curing, bonding, and assembly processes should be performed simultaneously or at the same location. For example, the tape is pre-applied to the first substrate, then the adhesive cures using an initiator, allowing the second substrate to be bonded and assembled quickly. Alternatively, the adhesive cures first using an initiator, followed by the bonding and assembly of both substrates in a short time. However, in some practical applications, it's necessary to pre-apply the tape to the first substrate at one location and allow the adhesive to cure using an initiator, resulting in a product containing both the first substrate and the tape. This product is then transported to another location for bonding and assembly with the second substrate. Since transport time typically takes days, weeks, or even months, the premature curing of the adhesive significantly reduces the bond strength between the two substrates, preventing the achievement of effective and durable adhesion. Utility Model Content

[0004] The purpose of this utility model is to solve at least one aspect of the aforementioned problems and defects existing in the prior art.

[0005] According to one aspect of the present invention, a double-sided adhesive tape is provided, the double-sided adhesive tape comprising:

[0006] Carrier layer;

[0007] A first adhesive layer is attached to the first surface of the carrier layer; and

[0008] The second adhesive layer is attached to the second surface of the carrier layer opposite to the first surface;

[0009] The carrier layer physically isolates the first adhesive layer and the second adhesive layer;

[0010] Wherein, the first adhesive in the first adhesive layer is cured by the first initiator, and the second adhesive in the second adhesive layer is cured by the second initiator;

[0011] The carrier layer is configured to: prevent the first initiator from initiating the curing of the second adhesive in the second adhesive layer via the carrier layer, and prevent the second initiator from initiating the curing of the first adhesive in the first adhesive layer via the carrier layer.

[0012] Preferably, the first adhesive in the first adhesive layer and the second adhesive in the second adhesive layer are the same adhesive.

[0013] Preferably, the first adhesive in the first adhesive layer and the second adhesive in the second adhesive layer are both viscoelastic adhesives or viscoelastic pressure-sensitive adhesives.

[0014] Preferably, the first initiator and the second initiator are the same initiator.

[0015] Preferably, the double-sided tape further includes: a first release paper layer, attached to the surface of the first adhesive layer away from the carrier layer; and a second release paper layer, attached to the surface of the second adhesive layer away from the carrier layer.

[0016] According to a first exemplary embodiment of the present invention, the double-sided tape is an ultraviolet-initiated pressure-sensitive tape.

[0017] According to a first exemplary embodiment of the present invention, the carrier layer is a film layer made of a material capable of blocking ultraviolet light; the first adhesive layer and the second adhesive layer are made of an adhesive that can be cured by ultraviolet light initiation; and the first initiator and the second initiator are ultraviolet light.

[0018] According to a first exemplary embodiment of the present invention, the carrier layer is at least one of the following material film layers: PI film layer, PE foam layer, PVC foam layer, PU foam layer, or PET film layer with ultraviolet blocking coating.

[0019] According to a second exemplary embodiment of the present invention, the double-sided tape is a hybrid structure tape.

[0020] According to a second exemplary embodiment of the present invention, the carrier layer is a PE foam layer, a PVC foam layer, or a PU foam layer; the first adhesive layer and the second adhesive layer are made of a mixed structural adhesive; and the first initiator and the second initiator are active primers.

[0021] According to the aforementioned exemplary embodiments of the present invention, the double-sided tape physically isolates the first adhesive layer and the second adhesive layer located on both sides of the carrier layer. Furthermore, the design of the carrier layer prevents the initiator from passing through the carrier layer from one side to the other. Due to the isolating effect of the carrier layer, the adhesives on both sides of the carrier layer can be activated separately, achieving independent curing control of the adhesives on both sides of the carrier layer. Therefore, the curing timing of the adhesives on both sides can be controlled separately according to different application requirements, improving the application flexibility of the tape.

[0022] Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram showing a double-sided adhesive tape according to an exemplary embodiment of the present invention. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this utility model with reference to the accompanying drawings is intended to explain the overall inventive concept of this utility model and should not be construed as a limitation thereof.

[0025] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0026] According to the inventive concept of this utility model, a double-sided adhesive tape is provided, comprising: a carrier layer, a first adhesive layer, and a second adhesive layer. The first adhesive layer is attached to a first surface of the carrier layer; the second adhesive layer is attached to a second surface of the carrier layer opposite to the first surface. The carrier layer physically isolates the first adhesive layer and the second adhesive layer. A first initiator initiates the curing of the first adhesive in the first adhesive layer, and a second initiator initiates the curing of the second adhesive in the second adhesive layer. The carrier layer is configured to: prevent the first initiator from initiating the curing of the second adhesive in the second adhesive layer via the carrier layer, and prevent the second initiator from initiating the curing of the first adhesive in the first adhesive layer via the carrier layer. In the double-sided adhesive tape provided by this utility model, the adhesives on both sides of the carrier layer can be activated separately.

[0027] See Figure 1 This utility model provides a double-sided adhesive tape 1. The double-sided adhesive tape 1 includes a carrier layer 10, a first adhesive layer 20, a second adhesive layer 30, a first release paper layer 40, and a second release paper layer 50.

[0028] The carrier layer 10 is located in the middle of the double-sided adhesive tape 1. The carrier layer 10 has a first surface and a second surface opposite to the first surface. The thickness of the carrier layer 10 is determined according to application requirements and the characteristics of the carrier material, typically between 10 micrometers and 5 millimeters, but not limited to the aforementioned range. The carrier layer 10 has sufficient mechanical strength to support the adhesive layers. The surface roughness of the carrier layer 10 is controlled within a suitable range to ensure the adhesion performance between the carrier layer 10 and the adhesive layers 20 and 30.

[0029] The first adhesive layer 20 is attached to the first surface of the carrier layer 10, and the second adhesive layer 30 is attached to the second surface of the carrier layer 10 opposite to the first surface. That is, the first adhesive layer 20 and the second adhesive layer 30 are located on opposite sides of the carrier layer 10. The carrier layer 10 supports the first adhesive layer 20 and the second adhesive layer 30 while physically isolating them. The thickness of the first adhesive layer 20 and the second adhesive layer 30 is selected depending on the required bond strength and application requirements, typically between 5 micrometers and 200 micrometers, but not limited to the aforementioned range.

[0030] The first release paper layer 40 is attached to the surface of the first adhesive layer 20 away from the carrier layer 10, and the second release paper layer 50 is attached to the surface of the second adhesive layer 30 away from the carrier layer 10. The function of the release paper layers is to protect the adhesive layers and prevent them from being contaminated or damaged during storage and transportation. The release paper layers are typically made of coated paper or plastic film with good peel properties.

[0031] According to this invention, the first adhesive in the first adhesive layer 20 can be cured by a first initiator, and the second adhesive in the second adhesive layer 30 can be cured by a second initiator. In some embodiments, the first adhesive in the first adhesive layer 20 and the second adhesive in the second adhesive layer 30 may be the same adhesive; the first initiator and the second initiator may be the same initiator. In other embodiments, the first adhesive in the first adhesive layer 20 and the second adhesive in the second adhesive layer 30 may be different adhesives, in which case the first initiator and the second initiator are respectively initiators capable of initiating the curing of the first adhesive and the curing of the second adhesive. In some embodiments, the first adhesive in the first adhesive layer 20 and / or the second adhesive in the second adhesive layer 30 may be semi-solid adhesives, such as viscoelastic adhesives or viscoelastic pressure-sensitive adhesives.

[0032] According to this invention, the carrier layer 10 is configured to: prevent the first initiator from initiating the curing of the first adhesive in the first adhesive layer 20 via the carrier layer 10 when the first initiator is used to initiate the curing of the second adhesive in the second adhesive layer 30; and prevent the second initiator from initiating the curing of the second adhesive in the second adhesive layer 30 via the carrier layer 10 when the second initiator is used to initiate the curing of the first adhesive in the first adhesive layer 20 via the carrier layer 10 when the second initiator is used to initiate the curing of the second adhesive in the second adhesive layer 30. In other words, in the double-sided tape 1 provided by this invention, the carrier layer 10 needs to possess good isolation properties to prevent the penetration of the initiator. Therefore, in this invention, the material selection and / or structural selection of the carrier layer 10 are crucial for achieving independent curing control of the adhesives on both sides of the carrier layer 10. For example, in terms of physical barrier properties, the dense structure of the carrier layer 10 can effectively prevent the diffusion and penetration of initiator molecules. In terms of chemical inertness, the material of the carrier layer 10 does not chemically react with the initiator, and there will be no degradation of the carrier layer or activation of the initiator due to chemical action.

[0033] The technical content of the double-sided adhesive tape (especially the carrier layer) provided by this utility model is described in detail below with reference to two exemplary embodiments.

[0034] According to a first exemplary embodiment, the double-sided tape 1 is an ultraviolet-initiated pressure-sensitive tape. The carrier layer 10 is a film layer made of a material capable of blocking ultraviolet light. Specifically, the carrier layer 10 is at least one of the following material film layers: a PI film layer, a PE foam layer, a PVC foam layer, a PU foam layer, or a PET film layer with an ultraviolet-blocking coating. These film layers share the common characteristic of having excellent ultraviolet blocking performance, effectively preventing ultraviolet light penetration and ensuring that ultraviolet light cannot penetrate the carrier layer 10 from one side and affect the adhesive layer on the other side. It should be noted that the "foam layer" described herein has closed-cell foaming characteristics, thereby providing the function of blocking the penetration of the initiator. In some examples, the carrier layer 10 may be a single-material carrier layer composed of one of the above-mentioned material film layers. In other examples, the carrier layer 10 may also be a composite material carrier layer including one of the above-mentioned material film layers.

[0035] In a first exemplary embodiment, the first adhesive layer 20 and the second adhesive layer 30 are made of an adhesive that can be cured by ultraviolet light, such as an acrylic adhesive. In its uncured state, this adhesive is in a viscoelastic state similar to a pressure-sensitive adhesive, exhibiting a certain degree of tackiness but low strength. The first initiator for the first adhesive layer 20 and the second initiator for the second adhesive layer 30 are ultraviolet light. When exposed to ultraviolet light, the adhesives in the first adhesive layer 20 and the second adhesive layer 30 are activated, initiating a polymerization reaction that rapidly cures the adhesive, gradually losing its pressure-sensitive properties and forming a high-strength bond.

[0036] According to the UV-initiated pressure-sensitive tape described in the first exemplary embodiment, in use, firstly, the first release paper layer 40 is peeled off, and the first adhesive layer 20 is irradiated with a UV lamp to activate a crosslinking reaction. Then, within a recommended open time, the first adhesive layer 20 is bonded to the surface of the first substrate, allowing the first adhesive in the first adhesive layer 20 to adhere firmly to the surface of the first substrate and cure. Due to the UV isolation effect of the carrier layer 10, the second adhesive in the second adhesive layer 30 will not be cured by UV irradiation. Next, when it is necessary to bond to the surface of the second substrate, the second release paper layer 50 is peeled off, and the second adhesive layer 30 is irradiated with a UV lamp to activate a crosslinking reaction. Then, within a recommended open time, the second adhesive layer 30 is bonded to the surface of the second substrate, allowing the second adhesive in the second adhesive layer 30 to adhere firmly to the surface of the second substrate and cure.

[0037] According to a second exemplary embodiment, the double-sided tape 1 is a hybrid structural tape (HST). The carrier layer 10 can be a PE foam layer, a PVC foam layer, or a PU foam layer. These membrane layers share the common characteristic of excellent chemical stability and barrier properties, enabling them to prevent the penetration of chemical initiators (such as reactive primers). It should be noted that the "foam layer" described herein has closed-cell foaming characteristics, thereby enabling it to block the penetration of chemical initiators. In some examples, the carrier layer 10 can be a single-material carrier layer composed of one of the aforementioned material membrane layers. In other examples, the carrier layer 10 can also be a composite material carrier layer including one of the aforementioned material membrane layers.

[0038] In a second exemplary embodiment, both the first adhesive layer 20 and the second adhesive layer 30 employ a hybrid adhesive structure. Under normal conditions, the adhesive components are relatively stable, and the adhesive maintains the viscoelastic state of a pressure-sensitive adhesive. When an active primer is applied, the active components in the active primer activate the curing agent in the adhesive, initiating a cross-linking and curing reaction of the adhesive to form a high-strength bond.

[0039] According to the hybrid structure tape described in the second exemplary embodiment, in use, an active primer is first applied to the surface of the first adhesive layer 20, then the first release paper layer 40 is peeled off, and the first adhesive layer 20 is adhered to the surface of the first substrate treated with the active primer. Under the action of the active primer, the first adhesive layer 20 gradually crosslinks and cures. Due to the isolating effect of the carrier layer 10, the active primer cannot penetrate to the second adhesive layer 30, so the second adhesive layer 30 remains uncured. Next, when it is necessary to adhere it to the surface of the second substrate, an active primer is first applied to the surface of the second adhesive layer 30, then the second release paper layer 50 is peeled off, and the second adhesive layer 30 is adhered to the surface of the second substrate treated with the active primer. Under the action of the active primer, the second adhesive layer 30 gradually crosslinks and cures.

[0040] According to the aforementioned exemplary embodiments of the present invention, the double-sided tape physically isolates the first adhesive layer and the second adhesive layer located on both sides of the carrier layer. Furthermore, the design of the carrier layer prevents the initiator from passing through the carrier layer from one side to the other. Due to the isolating effect of the carrier layer, the adhesives on both sides of the carrier layer can be activated separately, achieving independent curing control of the adhesives on both sides of the carrier layer. Therefore, the curing timing of the adhesives on both sides can be controlled separately according to different application requirements, improving the application flexibility of the tape.

[0041] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the present invention and should not be construed as a limitation thereof.

[0042] While some embodiments of the present invention have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-sided adhesive tape (1), characterized in that, The double-sided adhesive tape includes: Carrier layer (10); A first adhesive layer (20) is attached to the first surface of the carrier layer; and The second adhesive layer (30) is attached to the second surface of the carrier layer opposite to the first surface; The carrier layer physically isolates the first adhesive layer and the second adhesive layer; Wherein, the first adhesive in the first adhesive layer is cured by the first initiator, and the second adhesive in the second adhesive layer is cured by the second initiator; The carrier layer is configured to: prevent the first initiator from initiating the curing of the second adhesive in the second adhesive layer via the carrier layer, and prevent the second initiator from initiating the curing of the first adhesive in the first adhesive layer via the carrier layer.

2. The double-sided adhesive tape according to claim 1, characterized in that, The first adhesive in the first adhesive layer (20) and the second adhesive in the second adhesive layer (30) are the same adhesive.

3. The double-sided tape according to claim 2, characterized in that, The first adhesive in the first adhesive layer (20) and the second adhesive in the second adhesive layer (30) are both viscoelastic adhesives or viscoelastic pressure-sensitive adhesives.

4. The double-sided tape according to claim 2, characterized in that, The first initiator and the second initiator are the same initiator.

5. The double-sided tape according to claim 1, characterized in that, The double-sided tape also includes: The first release paper layer (40) is attached to the surface of the first adhesive layer away from the carrier layer; and The second release paper layer (50) is attached to the surface of the second adhesive layer away from the carrier layer.

6. The double-sided tape according to any one of claims 1 to 5, characterized in that, The double-sided tape is a UV-initiated pressure-sensitive tape.

7. The double-sided tape according to claim 6, characterized in that, The carrier layer is a film layer made of a material capable of blocking ultraviolet rays; The first adhesive layer and the second adhesive layer are made of an adhesive that can be cured by ultraviolet light; and The first initiator and the second initiator are ultraviolet rays.

8. The double-sided adhesive tape according to claim 7, characterized in that, The carrier layer is at least one of the following material film layers: PI film layer, PE foam layer, PVC foam layer, PU foam layer, or PET film layer with ultraviolet blocking coating.

9. The double-sided tape according to any one of claims 1 to 5, characterized in that, The double-sided tape is a hybrid structure tape.

10. The double-sided tape according to claim 9, characterized in that, The carrier layer is a PE foam layer, a PVC foam layer, or a PU foam layer; The first adhesive layer and the second adhesive layer are made of a hybrid structural adhesive; and The first initiator and the second initiator are reactive primers.

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