Bending-resistant double-sided tape

Abstract

The utility model discloses a bending-resistant double-sided adhesive tape which comprises a base material layer and adhesive layers arranged on the two surfaces of the base material layer respectively, at least one adhesive layer is a foam adhesive layer, bending-resistant texture blocks are arranged on the surface, away from the base material layer, of the foam adhesive layer, the bending-resistant texture blocks extend in the first direction, and the adjacent bending-resistant texture blocks are arranged at intervals. The bending-resistant double-sided adhesive tape is reasonable in structure, and the foam adhesive layer is arranged to provide impact-resistant protection and buffering effects for the product; when the folding screen is bent, extrusion force can be effectively released through bending closing or stretching opening of the bending-resistant texture blocks arranged on the surface of the foam adhesive layer, and the bending resistance of the adhesive tape and the attaching stability of the adhesive tape and an attached object are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesive tapes, in particular to a bending-resistant double-sided adhesive tape. Background Art

[0002] With technological advancements, foldable screen electronic devices, such as mobile phones and tablets, are becoming increasingly popular. Foldable screen displays in these electronic products are typically composite structures composed of various thin film layers. Double-sided tape is often used to secure these heterogeneous film layers. However, because the materials and moduli of each film layer vary, the stress levels they can withstand during simultaneous bending and folding also vary. Therefore, the double-sided tape between the film layers must possess excellent mechanical properties and flex resistance.

[0003] Patent CN218665870U discloses a bending-resistant double-sided tape for folding screens, comprising a substrate layer and adhesive layers disposed on both surfaces of the substrate layer. At least one surface of the substrate layer is provided with a groove, the length of the groove extending along the winding and unwinding direction of the double-sided tape, and the thickness of the groove gradually decreases from both sides to the middle along the groove width. Although the problem of the tape's resistance to bending is solved, electronic products are inevitably subject to falling and collision during use or transportation, and the tape's impact protection and cushioning effects are still poor.

[0004] Therefore, it is necessary to improve the bending-resistant double-sided tape in the prior art. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects existing in the prior art and provide a bending-resistant double-sided tape, which provides product impact protection and buffering effect through the setting of the foam adhesive layer; when the folding screen is bent, the bending and closing or stretching and opening of the bending-resistant texture blocks set on the surface of the foam adhesive layer can effectively release the squeezing force, thereby improving the bending resistance of the tape and the stability of adhesion with the object to be adhered.

[0006] In order to achieve the above-mentioned technical effects, the technical solution of the present invention is: a bend-resistant double-sided tape, comprising a substrate layer and an adhesive layer arranged on both surfaces of the substrate layer, at least one layer of the adhesive layer is a foam adhesive layer, and a surface of the foam adhesive layer away from the substrate layer is provided with a bend-resistant texture block, the bend-resistant texture block extends along a first direction, and adjacent bend-resistant texture blocks are arranged at intervals.

[0007] A preferred technical solution is that the bending-resistant texture block is an open groove, and the cross section of the groove is semicircular or isosceles trapezoidal.

[0008] A preferred technical solution is that the highest point of the protrusions between adjacent open-shaped grooves is parallel to the surface of the substrate layer.

[0009] A preferred technical solution is that the foam adhesive layer is a laminated structure of a polyurethane foam adhesive layer and a polyvinyl chloride foam adhesive layer / polyurethane foam adhesive layer, and the polyurethane foam adhesive layer is an adhesive adhesive layer.

[0010] The preferred technical solution is that one of the adhesive layers is a foam adhesive layer, and the other adhesive layer is a polyurethane adhesive layer.

[0011] A preferred technical solution is that the material of the substrate layer is polyimide.

[0012] A preferred technical solution is that the surface of the adhesive layer facing away from the substrate layer is covered with an antistatic release film.

[0013] A preferred technical solution is that the substrate layer has a thickness of 10 to 30 μm, the foam adhesive layer has a thickness of 10 to 100 μm, and the polyurethane adhesive layer has a thickness of 2 to 30 μm.

[0014] A preferred technical solution is that the substrate layer is a thermally conductive substrate layer, and the adhesive layer is a thermally conductive adhesive layer.

[0015] The advantages and beneficial effects of the utility model are:

[0016] The bending-resistant double-sided tape has a reasonable structure and provides product impact protection and cushioning through the setting of the foam adhesive layer; when the folding screen is bent, the bending and closing or stretching and opening of the bending-resistant texture blocks set on the surface of the foam adhesive layer can effectively release the squeezing force, thereby improving the bending resistance of the tape and the stability of its adhesion to the object being adhered. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the utility model's bending-resistant double-sided adhesive tape;

[0018] Figure 2 This is another structural schematic diagram of the bending-resistant double-sided adhesive tape of the present invention.

[0019] In the figure: 1. base material layer; 2. adhesive layer; 3. antistatic release film; 20. foam adhesive layer; 21. polyurethane adhesive layer; 22. bending-resistant texture block; 200. groove; 201. polyurethane foam adhesive layer; 202. polyvinyl chloride foam adhesive layer. DETAILED DESCRIPTION

[0020] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] The terms "surface" and "surface" are based on the normal use state of the bend-resistant double-sided tape and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

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

[0023] like Figures 1 and 2 As shown, the bending-resistant double-sided adhesive tape disclosed in the present invention includes a substrate layer 1 and adhesive layers 2 arranged on both surfaces of the substrate layer 1, at least one adhesive layer 2 is a foam adhesive layer 20, and the surface of the foam adhesive layer 20 away from the substrate layer 1 is provided with a bending-resistant texture block 22, the bending-resistant texture block 22 extends along the first direction, and adjacent bending-resistant texture blocks 22 are arranged at intervals.

[0024] The setting of the foam adhesive layer 20 provides the product with impact protection and buffering effect; when the folding screen is bent, the bending and closing or stretching and opening of the bending-resistant texture blocks 22 set on the surface of the foam adhesive layer 20 can effectively release the squeezing force, thereby improving the bending resistance of the tape and the stability of the adhesion with the object.

[0025] Furthermore, the bend-resistant texture blocks 22 are open grooves 200 with a semicircular or isosceles trapezoidal cross-section. This allows for a 180° bend without breaking and prevents adhesion of the groove sidewalls. The highest points of the protrusions between adjacent open grooves 200 are parallel to the surface of the substrate layer 1, increasing the bonding area between the adhesive layer and the adhered object, improving bonding strength and stability.

[0026] like Figure 1 As shown, in some embodiments, the foam adhesive layer 20 is a polyurethane foam adhesive layer 201 .

[0027] like Figure 2 As shown, in other embodiments, the foam adhesive layer 20 is a laminated structure of a polyvinyl chloride foam adhesive layer 202 and a polyurethane foam adhesive layer 201 , and the polyurethane foam adhesive layer 201 is an adhesive adhesive layer.

[0028] The polyurethane foam adhesive layer 201 has high bonding strength and can bond a variety of materials. It also has good flexibility, expanding and contracting within a certain range with the deformation of the substrate, resisting cracking, and exhibiting excellent weather resistance, allowing it to withstand hot summer conditions without aging. It also exhibits good resistance to many chemicals. The polyvinyl chloride foam adhesive layer 202 is fireproof, providing the tape with flame retardancy.

[0029] In order to achieve the thermal conductivity of the double-sided tape and prevent the foam adhesive layer 20 from having thermal insulation properties that lead to poor heat dissipation of the adhered object, which not only affects the adhesive strength of the tape but also has a negative impact on the performance of the adhered object, further, the substrate layer 1 is a thermally conductive substrate layer, and the adhesive layer 2 is a thermally conductive adhesive layer. Thermally conductive materials such as highly stable boron nitride and aluminum oxide can be added to the raw materials of the substrate layer and the adhesive layer. Among them, boron nitride has a low dielectric constant and is compatible with polyimide. It can exhibit low dielectric loss in high-frequency applications and is suitable for use in high-frequency electronic devices.

[0030] like Figures 1 and 2 As shown, in order to improve the heat conduction effect of the thermal double-sided tape and ensure that the tape plays an anti-impact protection and buffering role, in some embodiments, one adhesive layer 2 is a foam adhesive layer 20 and the other adhesive layer 2 is a polyurethane adhesive layer 21.

[0031] Substrate layer 1 is made of polyimide. Polyimide has excellent high-temperature resistance, with a melting point exceeding 500°C. It maintains stable performance in high-temperature environments, resists decomposition or discoloration at high temperatures, and exhibits excellent thermal stability. Polyimide also has high tensile strength and impact resistance, allowing it to withstand significant mechanical loads. Its high Young's modulus means it resists deformation when stretched and maintains good flexibility at low temperatures, making it less susceptible to brittle cracking. Polyimide also exhibits excellent tolerance to many solvents (such as alcohols, ketones, and esters), and is resistant to acids, alkalis, and oils.

[0032] The surface of the adhesive layer 2 facing away from the substrate layer 1 is covered with an antistatic release film 3 .

[0033] The thickness of the base material layer 1 is 10-30 μm, the thickness of the foam rubber layer 20 is 10-100 μm, and the thickness of the polyurethane adhesive layer 21 is 2-30 μm.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A bending-resistant double-sided tape comprising a substrate layer and adhesive layers disposed on both surfaces of the substrate layer, characterized in that: At least one of the adhesive layers is a foam adhesive layer, and a surface of the foam adhesive layer away from the substrate layer is provided with anti-bending texture blocks, the anti-bending texture blocks extend along a first direction, and adjacent anti-bending texture blocks are spaced apart.

2. The bending-resistant double-sided tape according to claim 1, characterized in that: The bending-resistant texture block is an open groove, and the cross section of the groove is semicircular or isosceles trapezoidal.

3. The bending-resistant double-sided tape according to claim 2, characterized in that: The highest points of the protrusions between adjacent open grooves are parallel to the surface of the substrate layer.

4. The bending-resistant double-sided tape according to claim 1, characterized in that: The foam adhesive layer is a laminated structure of a polyurethane foam adhesive layer, a polyvinyl chloride foam adhesive layer / a polyurethane foam adhesive layer, and the polyurethane foam adhesive layer is an adhesive adhesive layer.

5. The bending-resistant double-sided tape according to claim 1 or 2, characterized in that: One of the adhesive layers is a foam adhesive layer, and the other adhesive layer is a polyurethane adhesive layer.

6. The bending-resistant double-sided tape according to claim 1, characterized in that: The material of the substrate layer is polyimide.

7. The bending-resistant double-sided tape according to claim 1, characterized in that: The surface of the adhesive layer facing away from the substrate layer is covered with an antistatic release film.

8. The bending-resistant double-sided tape according to claim 5, characterized in that: The thickness of the substrate layer is 10-30 μm, the thickness of the foam adhesive layer is 10-100 μm, and the thickness of the polyurethane adhesive layer is 2-30 μm.

9. The bending-resistant double-sided tape according to claim 1 or 4, characterized in that: The substrate layer is a heat-conducting substrate layer, and the adhesive layer is a heat-conducting adhesive layer.

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