An adhesive structure, wearable product, and housing

Abstract

This utility model relates to an adhesive structure, wearable products, and housing. The adhesive structure includes a functional layer and an adhesive layer bonded to at least one side of the functional layer. The adhesive layer includes a flexible fabric layer embedded therein, which comprises a single layer of fibers or multiple layers of fibers. The functional layer is selected from at least one of a decorative layer, a stain-resistant layer, a wear-resistant layer, and a sealing layer. This utility model provides a lightweight adhesive structure with excellent comfort and durability, and strong adaptability to substrates and environments. It solves the technical problems of insufficient strength, limited functionality, poor process adaptability, and weak environmental adaptability of traditional adhesive structures, and has significant application advantages in wearable products, electronic device housings, automotive interiors, and other fields.

Description

Technical Field

[0001] This utility model belongs to the field of adhesive products, and particularly relates to an adhesive structure, as well as wearable products, shells and other fields that require bonding and functional integration, including the adhesive structure. Background Technology

[0002] With the rapid development of electronic devices, wearable devices, and automotive interiors, the performance requirements for material bonding structures are increasing. Traditional bonding structures typically use a single-function adhesive layer to directly bond a functional layer (such as a decorative layer or wear-resistant layer) to a substrate layer, but this method suffers from drawbacks such as insufficient bonding strength, limited functionality, poor process adaptability, and insufficient environmental adaptability. Utility model patent CN212630116U discloses a strap and wearable device that can be used to connect an electronic device to be worn on a user's wrist. The strap includes a strap body and a buffer portion. The strap body includes a first surface and a second surface arranged opposite to each other. The buffer portion is connected to the strap body and forms a cavity with the strap body on the side where the second surface is located. After the electronic device is worn on the user's wrist, the second surface faces the user's wrist skin, and the buffer portion can press against the wrist and deform to conform to the strap body. In this strap, the buffer portion forms a cavity with the strap body. After the electronic device is worn on the user's wrist, the buffer portion can press against the wrist and deform to conform to the strap body, thereby reducing the volume of the cavity. The aforementioned structural design allows the strap to be used by users with different wrist sizes and enables it to better fit the wrist, thus improving wearing comfort. However, the strap's complex structure results in higher production costs and makes it difficult to balance comfort and durability.

[0003] Utility model patent CN218044061U discloses a fabric-reinforced watch strap, which includes a vulcanized rubber layer and a vulcanized rubber layer filled within the vulcanized rubber layer; the vulcanized rubber layer is filled with vulcanized long-cut glass fibers. Although this patent provides a fabric-reinforced watch strap with a high modulus of elasticity, the long-cut glass fibers have low flexibility, resulting in insufficient comfort and bending resistance during use, making it unsuitable for folding, carrying, and long-term wear.

[0004] Therefore, how to provide a lightweight adhesive structure that is both comfortable and durable, and has strong adaptability to substrates and environments has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of this utility model is to provide an adhesive structure, as well as a wearable product and a shell including the adhesive structure.

[0006] In a first aspect, the present invention provides an adhesive structure, including a functional layer and an adhesive layer bonded to at least one side of the functional layer, wherein the adhesive layer includes a flexible fabric layer embedded therein, and the flexible fabric layer includes a single layer of fibers or multiple layers of fibers.

[0007] The functional layer is selected from at least one of the following: decorative layer, anti-fouling layer, wear-resistant layer, and sealing layer.

[0008] Traditional adhesive layers are mostly homogeneous structures lacking a reinforcing framework, making them prone to delamination and peeling after exposure to external impacts or prolonged use, especially exhibiting poor reliability under dynamic conditions such as bending and stretching. Current technologies that increase adhesive layer thickness to improve strength tend to result in a bulky overall structure and also fail to address the delamination problem under dynamic conditions.

[0009] This invention embeds single or multiple fiber layers (such as polyester fibers, aramid fibers, etc.) within an adhesive layer to obtain a flexible fabric layer. This unidirectional or multidirectional flexible fiber-reinforced structure, made of the same or different materials, significantly improves the tensile, shear, and bending resistance of the bonded structure, making it particularly suitable for dynamic stress scenarios such as wearable devices and automotive interiors. It solves the technical problems of traditional homogeneous adhesive layers, such as easy delamination and insufficient strength. Furthermore, by replacing traditional metal or ceramic reinforcements with a composite design that embeds fiber layers within the adhesive layer, the overall structural weight is significantly reduced. In addition, this invention can be mass-produced using conventional coating and curing processes, without the need for complex equipment or high-temperature, high-pressure conditions, thus reducing production costs.

[0010] The functional layer can be selected from at least one of the decorative layer, anti-fouling layer, abrasion-resistant layer, and sealing layer. More preferably, multiple functional layers can be stacked and combined as needed. For example, in wearable products, the decorative layer (such as a pattern printing layer) and the abrasion-resistant layer (such as a polyurethane coating) can be integrally stacked and bonded to meet the requirements of both aesthetics and durability.

[0011] Furthermore, the thickness of the adhesive layer is 20 μm to 2000 μm, preferably 50 to 1500 μm, more preferably 100-1000 μm, and the thickness of the flexible fabric layer is 10%-50% of the thickness of the adhesive layer.

[0012] Furthermore, the flexible fabric layer includes at least one of the following: polyester fiber layer, polypropylene fiber layer, polyamide fiber layer, hemp fiber layer, cotton fiber layer, silk fiber layer, and aramid fiber layer.

[0013] Furthermore, the flexible fabric layer includes at least a first fiber layer and a second fiber layer, wherein the fiber arrangement directions of the first fiber layer and the second fiber layer are different.

[0014] This invention utilizes multiple flexible fibers to form fiber layers, which are embedded within the adhesive layer, enhancing the strength and toughness of the adhesive layer without reducing its flexibility. Compared to using a single fiber layer to reinforce the adhesive layer, where the fiber arrangement direction is singular and it is difficult to achieve balanced mechanical properties in multiple directions, a composite fiber layer with different fiber arrangement directions is preferred to provide the adhesive layer with reinforcement and tear resistance in multiple directions. More preferably, multiple fiber layers formed using different fiber materials utilize the different strengths and temperature resistances of the fibers to form a flexible fabric layer with excellent overall performance.

[0015] Furthermore, the adhesive layer is selected from at least one of low-temperature thermoplastic adhesive layers, low-temperature thermosetting adhesive layers, and light-curing adhesive layers. Preferably, the adhesive layer is a low-temperature thermosetting (LTR) adhesive layer with a curing temperature below 100°C.

[0016] The adhesive layer is selected from low-temperature curing adhesives, which can directly bond heat-sensitive substrates such as plastics and fabrics. In particular, when a flexible fabric layer with slightly lower temperature resistance is embedded in it, it avoids the deformation or performance degradation of the flexible fabric layer and substrate caused by high-temperature curing, thus expanding the material selection range of the adhesive structure of this utility model and its application in the fields of flexible electronic devices and textile composite materials.

[0017] Furthermore, the adhesive structure includes multiple through-holes penetrating the functional layers and the adhesive layer. The design of the through-holes helps to release the internal stress of the adhesive structure, reduce the tendency of subsequent deformation or interlayer delamination, and can further improve the air venting and moisture permeability of the adhesive structure, thereby enhancing the product's resistance to humid heat aging.

[0018] Furthermore, a substrate layer is bonded to the outer surface of the adhesive layer away from the functional layer; or

[0019] A release layer is bonded to the outer surface of the adhesive layer away from the functional layer.

[0020] The adhesive structure of this invention can be directly bonded to the substrate to form a product, or it can be used as an intermediate material. In this case, it is preferable to attach a release layer to the adhesive layer to protect the adhesive layer.

[0021] Furthermore, the substrate layer satisfies at least one of the following:

[0022] (1) The substrate layer includes a metal layer;

[0023] (2) The substrate layer includes a non-metallic layer;

[0024] (3) The side of the substrate facing the adhesive layer includes an activation treatment layer with a roughness of 0.5 μm to 2.5 μm.

[0025] Furthermore, the non-metallic layer may be selected from at least one of the following: a plastic layer, a rubber layer, and a fabric layer.

[0026] Furthermore, the activated layer has a thickness of 1-20 μm and a roughness of 0.5 μm to 2.5 μm is achieved through mechanical roughening, laser etching, plasma treatment, or other methods. The formation of the activated layer effectively improves the interfacial bonding strength between the adhesive layer and the substrate, particularly when using difficult-to-bond substrates such as metals, significantly enhancing the bonding performance.

[0027] Secondly, this utility model provides a wearable article, including the aforementioned adhesive structure.

[0028] Thirdly, this utility model provides a housing, including the aforementioned adhesive structure.

[0029] This invention solves the technical problems of insufficient strength, limited functionality, poor process adaptability, and weak environmental adaptability of traditional adhesive structures through structural innovation, and has significant application advantages in wearable products, electronic device housings, automotive interiors and other fields.

[0030] The advantages of this utility model are as follows:

[0031] (1) This utility model embeds a single or multiple flexible fiber layers in the adhesive layer, which can significantly improve the tensile, shear and bending resistance of the adhesive structure. It is especially suitable for dynamic stress scenarios such as wearable devices and automotive interiors, and solves the technical problem of easy delamination of traditional homogeneous adhesive layers.

[0032] (2) The functional layer of this utility model has a variety of design methods or a laminated composite method. The low-temperature curing adhesive layer can be directly embedded into the flexible fabric layer, so that the functional layer and the substrate layer are directly bonded to achieve integrated molding, which simplifies the production process and avoids the deformation or performance degradation of the flexible fabric layer, functional layer and substrate caused by high-temperature curing, thus expanding the application of this utility model in the fields of flexible electronic devices, textile composite materials and the like.

[0033] (3) This utility model replaces the defects of traditional rigid reinforcements that reduce structural comfort by using a composite design of flexible fiber layer embedded with adhesive layer. It can also significantly reduce the overall structural weight and realize lightweight product design. It has significant application advantages in wearable devices, electronic device housings and other fields. Attached Figure Description

[0034] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0035] Figure 1 A cross-sectional view of the adhesive structure according to Embodiment 1 of the present invention is shown;

[0036] Figure 2 A cross-sectional view of the adhesive structure according to Embodiment 2 of the present invention is shown;

[0037] Figure 3 A cross-sectional view of the watch strap structure according to Embodiment 3 of the present invention is shown.

[0038] Explanation of reference numerals in the attached drawings: 1. Functional layer, 2. Adhesive layer, 3. Flexible fabric layer, 3.1. First fiber layer, 3.2. Second fiber layer, 4. Through hole, 5. Substrate layer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description will be provided in conjunction with the appendix. Figures 1-3 The present invention will be described in further detail below. It should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0040] An adhesive structure that can be used in wearable products, such as as a watch strap or bandage, or as part of clothing or its decoration, and can also be used in housings such as mobile phone cases, computer cases, etc., including:

[0041] (1) Functional layer 1, which is selected from at least one of the following: decorative layer, anti-fouling layer, wear-resistant layer, and sealing layer;

[0042] (2) Adhesive layer 2, bonded to at least one side of functional layer 1, including a flexible fabric layer 3 embedded therein, the thickness of adhesive layer 2 is 20 μm to 2000 μm, preferably 50 to 1500 μm, more preferably 100-1000 μm, and adhesive layer 2 is selected from at least one of low temperature thermoplastic adhesive layer, low temperature thermosetting adhesive layer, and photocurable adhesive layer;

[0043] (3) The flexible fabric layer 3 includes a single layer of fibers or multiple layers of fibers, and the thickness of the flexible fabric layer 3 is 10%-50% of the thickness of the adhesive layer; the flexible fabric layer 3 includes at least one of polyester fiber layer, polypropylene fiber layer, polyamide fiber layer, hemp fiber layer, cotton fiber layer, silk fiber layer, and aramid fiber layer; preferably, the flexible fabric layer 3 includes at least a first fiber layer 3.1 and a second fiber layer 3.2, and the fiber arrangement directions of the first fiber layer 3.1 and the second fiber layer 3.2 are different, or the fiber layers are made of different materials;

[0044] Optionally, (4) a substrate layer 5 or a release layer is laminated on the outer side of the adhesive layer 2 away from the functional layer 1, wherein the substrate layer 5 satisfies at least one of the following:

[0045] 1) The substrate layer 5 includes a metal layer;

[0046] 2) The substrate layer 5 includes a non-metallic layer;

[0047] 3) The side of the substrate layer 5 facing the adhesive layer includes an activation treatment layer (not shown) with a roughness of 0.5 μm to 2.5 μm. The specific material of the substrate layer 5 can be determined according to the application requirements of the adhesive structure.

[0048] Optional (5) multiple through holes 4, at least penetrating the functional layer 1 and the adhesive layer 2.

[0049] Example 1

[0050] See appendix Figure 1 An adhesive structure for watch straps, comprising:

[0051] (1) Functional layer 1, including a decorative layer and a wear-resistant layer on its outer surface;

[0052] (2) Adhesive layer 2, bonded to at least one side of functional layer 1, including a flexible fabric layer 3 embedded therein, the thickness of adhesive layer 2 is about 1000 μm, adhesive layer 2 is a low temperature thermosetting adhesive layer, specifically a low temperature thermosetting (LTR) adhesive layer with a curing temperature of less than 100°C.

[0053] (3) Flexible fabric layer 3, including a single layer of polyester fiber with a thickness of about 200 μm.

[0054] Example 2

[0055] See appendix Figure 2 An adhesive structure for watch straps, comprising:

[0056] (1) Functional layer 1, including a decorative layer and a wear-resistant layer on its outer surface;

[0057] (2) Adhesive layer 2, bonded to at least one side of functional layer 1, including a flexible fabric layer embedded therein, adhesive layer 2 has a thickness of about 1000 μm, adhesive layer 2 is a low temperature thermosetting adhesive layer, specifically a low temperature thermosetting (LTR) adhesive layer with a curing temperature of less than 100°C.

[0058] (3) Flexible fabric layer, including first fiber layer 3.1 and second fiber layer 3.2, with a total thickness of about 300 μm. First fiber layer 3.1 and second fiber layer 3.2 are both polyester fiber layers with different fiber arrangement directions, forming an angle of about 45°.

[0059] Example 3

[0060] See appendix Figure 3 A watch strap structure with an adhesive structure, comprising:

[0061] (1) Functional layer 1, including a decorative layer and a wear-resistant layer on its outer surface;

[0062] (2) Adhesive layer 2, bonded to at least one side of functional layer 1, including a flexible fabric layer embedded therein, adhesive layer 2 has a thickness of about 1000 μm, adhesive layer 2 is a low temperature thermosetting adhesive layer, specifically a low temperature thermosetting (LTR) adhesive layer with a curing temperature of less than 100°C.

[0063] (3) A flexible fabric layer, comprising a first fiber layer 3.1 and a second fiber layer 3.2, with a total thickness of approximately 300 μm. Both the first fiber layer 3.1 and the second fiber layer 3.2 are polyester fiber layers with different fiber orientations, forming an angle of approximately 45°. See also the appendix. Figure 2 ;

[0064] (4) Substrate layer 5, laminated on the outer side of adhesive layer 2 away from functional layer 1, substrate layer 5 is PU leather layer;

[0065] (5) Multiple through holes 4 penetrate the functional layer 1, adhesive layer 2 and substrate layer 5.

[0066] The preferred embodiments of this utility model have been described above, which are intended to make the spirit of this utility model clearer and easier to understand. They are not intended to limit this utility model. All modifications, substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adhesive structure, characterized in that, It includes a functional layer (1) and an adhesive layer (2) bonded to at least one side of the functional layer (1), the adhesive layer (2) including a flexible fabric layer (3) embedded therein, the flexible fabric layer (3) including a single layer of fibers or multiple layers of fibers; The functional layer (1) is selected from at least one of the following: decorative layer, anti-fouling layer, wear-resistant layer, and sealing layer.

2. The adhesive structure as described in claim 1, characterized in that, The thickness of the adhesive layer (2) is 20 μm to 2000 μm, and the thickness of the flexible fabric layer (3) is 10% to 50% of the thickness of the adhesive layer.

3. The adhesive structure as described in claim 2, characterized in that, The flexible fabric layer (3) includes at least one of the following: polyester fiber layer, polypropylene fiber layer, polyamide fiber layer, hemp fiber layer, cotton fiber layer, silk fiber layer, and aramid fiber layer.

4. The adhesive structure as described in any one of claims 1-3, characterized in that, The flexible fabric layer (3) includes at least a first fiber layer (3.1) and a second fiber layer (3.2), wherein the fiber arrangement directions of the first fiber layer (3.1) and the second fiber layer (3.2) are different.

5. The adhesive structure as described in any one of claims 1-3, characterized in that, The adhesive layer (2) is selected from at least one of low-temperature thermoplastic adhesive layer, low-temperature thermosetting adhesive layer, and light-curing adhesive layer.

6. The adhesive structure according to any one of claims 1-3, characterized in that, The adhesive structure includes multiple through holes (4) that penetrate the functional layer (1) and the adhesive layer (2).

7. The adhesive structure according to any one of claims 1-3, characterized in that, The substrate layer (5) is bonded to the outer surface of the adhesive layer (2) away from the functional layer (1); or A release layer is bonded to the outer surface of the adhesive layer (2) away from the functional layer (1).

8. The adhesive structure as described in claim 7, characterized in that, The substrate layer (5) satisfies at least one of the following: 1) The substrate layer (5) includes a metal layer; 2) The substrate layer (5) includes a non-metallic layer; 3) The side of the substrate layer (5) facing the adhesive layer (2) includes an activation treatment layer with a roughness of 0.5 μm to 2.5 μm.

9. A wearable product, characterized in that, Includes the adhesive structure as described in any one of claims 1-8.

10. A housing, characterized in that, Includes the adhesive structure as described in any one of claims 1-8.

Images