Composite board used as shell

Abstract

The utility model provides a composite board used as a shell. The composite board comprises a base material layer, a first bonding layer, a sandwich layer, a second bonding layer and a panel layer which are arranged in a laminated mode, the base material layer is of a rigid structure, the sandwich layer is of a flexible structure, and the thickness of the base material layer is larger than that of the sandwich layer. The rigid structure is adopted as the base material layer, the flexible structure is adopted as the sandwich layer, and the thickness of the base material layer is adjusted to be larger than that of the sandwich layer, so that the composite board has certain strength and rigidity, can buffer external scraping damage, and has an elastic hand feeling.

Description

Technical Field

[0001] The utility model relates to the technical field of plates, in particular to a composite plate used as a housing. Background Art

[0002] At present, the composite plates used as housings are usually thin leather plates. The thin leather plates refer to thin plates mainly composed of a surface leather layer and a structural support layer. The surface leather layer consists of an adhesive film layer, an adhesive layer and a base. The surface adhesive film layer endows the leather with texture, color, touch, wear resistance, weather resistance, waterproofness and other properties. The surface adhesive film layer is mainly formed of PVC, PU (polyurethane) or silicone, with a thickness of 0.03 - 0.3 mm. The base is usually a layer of soft material, mainly common elastic fabrics such as polyester and spandex. The base gives the surface leather layer certain heaviness, elasticity, toughness and other properties. On the leather plate, it also serves as a good interface for composite with the multi-layer composite material structure layer. The common thickness range of the base is 0.2 - 0.8 mm. The adhesive layer is used to connect the surface adhesive film and the base material. The multi-layer composite material structure layer mainly provides the necessary physical properties such as rigidity and strength for the leather plate, with a thickness generally of 0.2 - 0.8 mm. The overall thickness of the existing thin leather plates is 0.23 - 1.3 mm, and it is a kind of thin plate with leather texture.

[0003] Due to environmental protection requirements, most of such leather plates currently use PU leather or silicone leather as the surface leather layer, rarely using PVC leather, and are made by hot pressing and laminating with the plate through a hot melt adhesive film, or by hot pressing and curing PU leather or silicone leather with a glass fiber prepreg. The thickness of PU leather or silicone leather is 0.2 - 0.6 mm. Such plates are cut into the required sizes and shapes and are widely used in the 2D flat mobile phone battery housings or tablet computer battery housings.

[0004] The existing structural support layer of leather plates is mainly composed of thermosetting epoxy resin and glass fiber. Although its strength is higher than that of engineering plastics, its thermosetting property makes the raw materials difficult to recycle, so it is gradually prohibited from use by some end customers in an environment with increasingly strict environmental protection requirements. At the same time, due to its thermosetting property, it cannot be reshaped twice, and its application scenarios are limited. At present, there is also a composite structure using a plasticizable material as the base layer. When this composite structure is used as the housing material of electronic devices, etc., it is difficult to meet people's requirements for the strength, rigidity and scratch resistance of the housing, and there is also a problem that the material is too hard and lacks an elastic feel during use.

[0005] Therefore, there is an urgent need for a composite plate used as a housing to solve the above problems. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a composite board used as a housing, which has good strength, rigidity and scratch resistance, and has a better elastic feel.

[0007] To achieve the above object, the present utility model provides a composite board used as a housing, including a base material layer, a first bonding layer, a sandwich layer, a second bonding layer and a panel layer which are stacked. The base material layer is a rigid structure, the sandwich layer is a flexible structure, and the thickness of the base material layer is greater than the thickness of the sandwich layer.

[0008] Compared with the prior art, the present utility model uses a rigid structure as the base material layer and a flexible structure as the sandwich layer. The rigid structure can give the composite board high strength and rigidity, improve the ability of the composite board to resist deformation, and it is difficult to deform when subjected to external forces. The flexible structure gives the composite board an elastic feel and can buffer external scratching damage, improving scratch resistance. Further, the thickness of the base material layer is set to be greater than the thickness of the sandwich layer, so that the base material layer can provide better structural support and protection, enabling the composite board of the present utility model to maintain performance and structural integrity for a long time during use. Therefore, the composite board of the present utility model has high strength and rigidity, good scratch resistance and a better elastic feel.

[0009] As a preferred technical solution, the hardness of the base material layer of the present utility model is greater than the hardness of the sandwich layer.

[0010] As a preferred technical solution, the hardness of the base material layer of the present utility model is 60HRC - 80BHN, and the hardness of the sandwich layer is 60HA - 85HA.

[0011] As a preferred technical solution, the thickness of the base material layer of the present utility model is 0.3mm - 0.8mm, and the thickness of the sandwich layer is 0.05mm - 0.15mm.

[0012] As a preferred technical solution, the base material layer and the sandwich layer of the present utility model are bonded through the first bonding layer, and the sandwich layer and the panel layer are bonded through the second bonding layer.

[0013] As a preferred technical solution, the thickness of the first bonding layer of the present utility model is 0.01mm - 0.05mm.

[0014] As a preferred technical solution, the thickness of the second bonding layer of the present utility model is 0.03mm - 0.08mm.

[0015] As a preferred technical solution, the thickness of the panel layer of the present utility model is 0.03mm - 0.08mm.

[0016] As a preferred technical solution, a functional layer is provided on the surface of the panel layer of the present utility model.

[0017] As a preferred technical solution, the functional layer of the present utility model is an anti-fouling layer and / or a hand feeling layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a composite board used as a housing in the first embodiment of the present utility model.

[0019] Figure 2 It is a schematic diagram of a composite board used as a housing in the second embodiment of the present utility model.

[0020] In the drawings, 100 - composite board, 10 - base material layer, 20 - first bonding layer, 30 - sandwich layer, 40 - second bonding layer, 50 - panel layer, 60 - functional layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To better illustrate the purpose, technical solution and beneficial effects of the present utility model, the present utility model will be further described below in conjunction with specific embodiments. It should be noted that the following described methods are further explanatory descriptions of the present utility model and should not be regarded as limitations to the present utility model.

[0022] Please refer to Figure 1 , Figure 1 It is a schematic diagram of a composite board used as a housing in the first embodiment of the present utility model. In this embodiment, the present utility model provides a composite board 100 used as a housing, which includes a base material layer 10, a first bonding layer 20, a sandwich layer 30, a second bonding layer 40 and a panel layer 50 arranged in a stacked manner. The base material layer 10 is a rigid structure, the sandwich layer 30 is a flexible structure, and the thickness of the base material layer 10 is greater than the thickness of the sandwich layer 20.

[0023] Among them, the base material layer 10 plays a role in providing the structural strength and rigidity of the composite board. In this embodiment, the base material layer 10 can be selected from high-strength plastics. Using high-strength plastics as the base material layer 10 can not only provide the structural strength and rigidity of the composite board 100, but also provide plastic processing performance. Specifically, the high-strength plastic can be polycarbonate (PC), polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polyamide (PA), polybutylene terephthalate (PBT), polyphenylene ether (PPO), polyoxymethylene (POM), polyetherimide (PEI), polyphenylene sulfide (PPS), polypropylene (PP), polyetheretherketone (PEEK), polymethyl methacrylate (PMMA) and other materials, their modified materials or their composite materials. The thickness of the base material layer 10 is 0.3 mm to 0.8 mm. Specifically, the thickness of the base material layer 10 can be but is not limited to 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm.

[0024] The first adhesive layer 20 is disposed between the base material layer 10 and the sandwich layer 30, and the base material layer 10 and the sandwich layer 30 are bonded through the first adhesive layer 20. The first adhesive layer 20 is prepared using a polyurethane (PU) binder. Specifically, the polyurethane binder can be selected from waterborne polyurethane, polyurethane containing organic solvents, solvent-free polyurethane, or reactive solvent-free polyurethane. This series of PU adhesives have high bonding strength with materials such as high-strength plastics and TPU, and good environmental aging resistance. Moreover, the adhesive layer formed by the PU-based adhesive has good flexibility, which is convenient for subsequent shaping. The thickness of the first adhesive layer is 0.01 mm to 0.05 mm. By way of example, the thickness of the first adhesive layer can be, but is not limited to, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm.

[0025] The sandwich layer 30 provides an elastic feel for the composite board 100 of the present utility model, and can buffer external scratching damage, improving the scratch resistance. In this embodiment, the sandwich layer 30 can be made of thermoplastic polyurethane elastomer (TPU), foamed polyurethane, etc. The thickness of the sandwich layer 30 is 0.05 mm to 0.15 mm. Specifically, the thickness of the sandwich layer can be, but is not limited to, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm.

[0026] The hardness of the base material layer 10 is greater than the hardness of the sandwich layer 30. Specifically, the hardness of the base material layer 10 is 60 HRC to 80 BHN, and the hardness of the sandwich layer 30 is 60 HA - 85 HA. By way of example, the hardness of the sandwich layer 30 of the present utility model can be, but is not limited to, 60 HA, 62 HA, 64 HA, 66 HA, 68 HA, 70 HA, 72 HA, 74 HA, 76 HA, 78 HA, 80 HA, 82 HA, 83 HA, 84 HA, 85 HA.

[0027] The second adhesive layer 40 is disposed between the sandwich layer 30 and the panel layer 50, and the sandwich layer 30 and the panel layer 50 are bonded through the second adhesive layer 40. The material used for the second adhesive layer 40 can be the same as the material used for the first adhesive layer 20. For example, a polyurethane binder can be used. Specifically, the polyurethane binder can be selected from waterborne polyurethane, polyurethane containing organic solvents, solvent-free polyurethane, or reactive solvent-free polyurethane. Moreover, the adhesive layer formed by the polyurethane-based adhesive has good flexibility, which is convenient for subsequent shaping. The thickness of the second adhesive layer 40 is 0.03 mm to 0.08 mm. By way of example, the thickness of the second adhesive layer 40 can be, but is not limited to, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm.

[0028] The panel layer 50 provides patterns and tactile sensations for the composite board 100 of the present utility model. Specifically, the panel layer 50 can be a PU leather layer. The PU leather layer can provide patterns and tactile sensations for the composite board 100 of the present utility model. The thickness of the panel layer 50 can be 0.03 mm to 0.08 mm. By way of example, the thickness of the panel layer 50 can be, but is not limited to, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm.

[0029] In this embodiment, the present utility model uses a rigid structure as the base layer 10 and a flexible structure as the sandwich layer 30. The rigid structure can give the composite board 100 high strength and rigidity, improving the ability of the composite board 100 to resist deformation and making it difficult to deform when subjected to external forces. The flexible structure gives the composite board 100 an elastic feel and can buffer external scratching damage, improving the scratch resistance. Further, the thickness of the base layer 10 is set to be greater than the thickness of the sandwich layer 30, enabling the base layer 10 to provide better structural support and protection, so that the composite board 100 of the present utility model can maintain its performance and structural integrity for a long time during use. At the same time, the PU, TPU, and foamed PU used in the base layer 10, the first adhesive layer 20, the sandwich layer 30, the second adhesive layer 40, and the panel layer 50 are all plastic materials or soft materials, facilitating subsequent secondary shaping of the composite board 100. Therefore, the composite board of the present utility model has high strength and rigidity, good scratch resistance, and a good elastic feel, and is particularly suitable as a housing material for products such as electronic devices. Due to its secondary shaping characteristics, it can be extended from a 2D flat application to a 3D-shaped structural application.

[0030] Please refer to Figure 2 , Figure 2 is a schematic diagram of the composite board used as a housing in the second embodiment of the present utility model. In the second embodiment of the present utility model, the composite board 100 of the present utility model includes a base layer 10, a first adhesive layer 20, a sandwich layer 30, a second adhesive layer 40, a panel layer 50, and a functional layer 60 arranged in a stacked manner. Among them, the specific settings of the base layer 10, the first adhesive layer 20, the sandwich layer 30, the second adhesive layer 40, and the panel layer 50 are the same as those in the first embodiment of the present utility model and will not be elaborated here. The functional layer 60 is provided on the surface of the panel layer 50. The functional layer 60 can be adjusted according to different functional requirements to meet certain needs. By way of example, the functional layer 60 can be an anti-fouling layer (not marked in the figure), the functional layer 60 can be a tactile layer (not marked in the figure), and the functional layer 60 can also be a tactile layer and an anti-fouling layer sequentially stacked on the surface of the panel layer 50.

[0031] Generally speaking, by using high-strength plastics with suitable thickness as the base material layer in this composite board of the utility model, the mechanical properties required for the shell structure can be achieved for this product, such as the back cover shell of mobile phones, the shell of tablet computers, the shell of game controllers, and the interior shell of automobiles. A sandwich layer with good elasticity and other comprehensive properties is introduced into the composite board, making the shell structure have an elastic and fleshy feeling, with a high-class and comfortable experience. The materials used in the composite board are either thermoplastic or flexible, facilitating subsequent hot bending into a 3D shape and expanding the application scenarios of the composite board.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, it is not limited only to the embodiments listed. Those of ordinary skill in the art should understand that the technical solutions of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the utility model.

Claims

1. A composite sheet used as a housing, characterized in that, It includes a substrate layer, a first adhesive layer, a sandwich layer, a second adhesive layer and a panel layer which are arranged in a laminated manner. The substrate layer is a rigid structure, the sandwich layer is a flexible structure, and the thickness of the substrate layer is greater than that of the sandwich layer.

2. The composite sheet used as a housing according to claim 1, characterized in that, The hardness of the substrate layer is greater than that of the sandwich layer.

3. The composite sheet used as a housing according to claim 2, characterized in that, The hardness of the substrate layer is 60 HRC to 80 BHN, and the hardness of the sandwich layer is 60 HA to 85 HA.

4. The composite sheet used as a housing according to claim 1, characterized in that, The thickness of the substrate layer is 0.3 mm to 0.8 mm, and the thickness of the sandwich layer is 0.05 mm to 0.15 mm.

5. The composite sheet used as a housing according to claim 1, characterized in that, The substrate layer and the sandwich layer are bonded through the first adhesive layer, and the sandwich layer and the panel layer are bonded through the second adhesive layer.

6. The composite sheet used as a housing according to claim 1, characterized in that, The thickness of the first adhesive layer is 0.01 mm to 0.05 mm.

7. The composite sheet used as a housing according to claim 1, characterized in that, The thickness of the second adhesive layer is 0.03 mm to 0.08 mm.

8. The composite sheet used as a housing according to claim 1, characterized in that, The thickness of the panel layer is 0.03 mm to 0.08 mm.

9. The composite sheet used as a housing according to claim 1, characterized in that, A functional layer is provided on the surface of the panel layer.

10. The composite sheet used as a housing according to claim 9, characterized in that, The functional layer is an anti-fouling layer and / or a handle feeling layer.

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