Structural member, preparation method thereof and electronic equipment

Abstract

The invention provides a structural part and a preparation method thereof and electronic equipment, and relates to the technical field of terminals.The structural part comprises a fiberboard, a second slurry layer and a metal coating layer; the fiberboard comprises first thermosetting slurry, second slurry and fibers, the fibers are doped in the first thermosetting slurry and / or the second slurry, and the first thermosetting slurry is bonded with the second slurry; the second slurry layer comprises second slurry and covers all the surfaces of the fiberboard; the metal coating layer covers at least part of the surface of the second slurry layer and is combined with at least part of the surface of the second slurry layer, and the material of the metal coating layer comprises at least one of metal and metal alloy. Therefore, the surface of the structural member has a local or large-area high-texture metal effect which is high in gloss, good in flatness and excellent in reliability.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to a structural component and a preparation method thereof, and an electronic device. Background Art

[0002] Mobile phones, laptops and other electronic devices are becoming increasingly important in people's work and life. As electronic devices gradually develop towards lightweight, structural parts such as battery covers and middle frames in electronic devices are made of some new materials, such as resin-based carbon fiber composite materials, so that electronic devices can have heat dissipation and mechanical properties while also being lightweight and thin.

[0003] Since the surface of resin-based carbon fiber composites is resin, their appearance often has a plastic texture, and the black color of the carbon fiber in resin-based carbon fiber composites is difficult to cover up. In addition, there are often problems such as uneven surface, resin enrichment, resin deficiency, black particle spots, and complex processes, which lead to the appearance of structural parts with poor refinement and a single appearance effect.

[0004] Traditionally, resin-based carbon fiber composites have been treated with a masking spray coating to address these issues. However, current masking spray coatings often fail to achieve a high-end metallic texture, preventing them from achieving a high-end appearance. Summary of the Invention

[0005] The present application provides a structural component, a preparation method thereof, and an electronic device. The second slurry layer in the structural component is tightly combined with the fiberboard. The defects of the fiber prepreg can be improved by the second slurry layer. At the same time, the metal plating layer on the surface of the second slurry layer can achieve a local or large-area high-quality metal effect with high gloss, good flatness, and excellent reliability, thereby making the structural component have the properties of light weight, low cost, high strength, good toughness, good dimensional stability, and excellent chemical resistance.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, a structural component is provided, which includes: a fiberboard, a second slurry layer and a metal coating layer; the fiberboard includes a first thermosetting slurry, a second slurry and fibers, the fibers are mixed in the first thermosetting slurry and / or the second slurry, and the first thermosetting slurry is bonded to the second slurry; the second slurry layer includes the second slurry and covers all surfaces of the fiberboard; the metal coating layer covers at least a portion of the surface of the second slurry layer and is bonded to at least a portion of the surface of the second slurry layer, and the material of the metal coating layer includes at least one of a metal and a metal alloy.

[0008] An embodiment of the present application provides a structural component in which the second slurry layer is tightly combined with the carbon fiber board. The second slurry layer can improve the defects of the fiber board and make the surface smooth. At the same time, the metal coating layer on the surface of the second slurry layer can achieve a local or large-area high-quality metal effect with high gloss, good flatness, and excellent reliability, such as imitation stainless steel texture. The structural component also has the advantages of light weight, low cost, high strength, good toughness, good dimensional stability, excellent chemical resistance, etc., and the product has strong performance.

[0009] In a possible implementation of the first aspect, the fiberboard includes a carbon fiber board; the metal coating layer covers the entire surface of the second slurry layer, and the material of the metal coating layer includes at least one of titanium, chromium, tungsten, vanadium, niobium, zirconium, hafnium, titanium carbide and tungsten carbide.

[0010] This implementation is simple and easy to implement, and titanium, chromium, tungsten, vanadium, niobium, zirconium, hafnium, titanium carbide, tungsten carbide, etc. can achieve a good high-quality metal effect for structural parts.

[0011] In a possible implementation of the first aspect, the carbon fiber board includes carbon fibers and a first thermosetting resin, and the carbon fibers are doped in the first thermosetting resin; the second slurry of the second slurry layer includes a second thermosetting resin, and the second slurry layer composed of the second thermosetting resin is directly bonded to the carbon fiber board.

[0012] In this implementation, the first thermosetting resin itself is an ultra-high-strength adhesive and can therefore be well bonded to the carbon fiber prepreg.

[0013] In a possible implementation of the first aspect, the structural member further includes an adhesive layer; the carbon fiber plate includes carbon fiber and a first thermosetting resin, and the carbon fiber is doped in the first thermosetting resin; the second slurry of the second slurry layer includes a thermoplastic resin, and the second slurry layer composed of the thermoplastic resin is bonded to the carbon fiber plate through the adhesive layer.

[0014] In this implementation, the thermoplastic resin has poor adhesion and can therefore be well combined with the carbon fiber prepreg through the adhesive layer.

[0015] In a possible implementation of the first aspect, the structural component further includes a paint layer, and the paint layer covers at least a portion of the surface of the metal coating layer.

[0016] In this implementation, while having a local metallic texture, a splicing structural part with a local metallic texture can be obtained by masking a partial area of ​​the surface of the metal coating layer and then spraying a paint layer, making the product appearance more diversified and meeting the needs of more consumers.

[0017] In a possible implementation of the first aspect, a pencil hardness test of the structural part is greater than or equal to 2H; and / or a 100-grid adhesion of the structural part is greater than or equal to 4B; and / or a mirror effect grade of the structural part is less than or equal to A3.

[0018] In this implementation, the structural member is relatively hard and has a smooth surface.

[0019] In a possible implementation of the first aspect, the preparation method of the metal coating layer includes at least one of physical vapor deposition, non-conductive vacuum plating, thermal evaporation, magnetron sputtering coating, ordinary spraying and water plating.

[0020] This implementation is simple and easy to implement.

[0021] In a possible implementation of the first aspect, the modulus of the second slurry layer is greater than or equal to 3000 mPA; and / or the withstand temperature of the second slurry layer is greater than or equal to 150° C.; and / or the heat deformation temperature of the second slurry layer is greater than or equal to 120° C.; and / or the thermal expansion coefficient of the second slurry layer is less than or equal to 60×10 -6 / K; and / or, the surface hardness of the second slurry layer is greater than or equal to F.

[0022] In this implementation, the second slurry layer has good high temperature resistance, low thermal expansion coefficient, and excellent surface hardness, which helps to reduce scratches. It has a high modulus and can be directly physically vapor deposited on its surface. It is very suitable for sputtering physical vapor deposition metallization process. During the sputtering process, the second slurry layer can effectively improve the yield by virtue of its high heat resistance and good bonding strength of the layer formed by physical vapor deposition. In addition, the high hardness and low thermal expansion coefficient of the second slurry layer help to avoid problems such as cracking of the layer formed by physical vapor deposition.

[0023] In a possible implementation of the first aspect, the thickness of the metal coating layer ranges from 0.2 μm to 8 μm.

[0024] In this implementation, the thickness of the metal plating layer is relatively thin, which will not affect the overall lightness and thinness of the electronic device.

[0025] In a possible implementation of the first aspect, the structural component includes any one of a middle frame, a battery cover, and a shell.

[0026] In this implementation, structural parts such as the middle frame, battery cover and shell can have a local or large-area high-quality metal effect with high gloss, good flatness and excellent reliability, and also have the advantages of light weight, low cost, high strength, good toughness, good dimensional stability and excellent chemical resistance.

[0027] In a possible implementation of the first aspect, the thermosetting resin includes at least one of epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane and bismaleimide resin.

[0028] This implementation is simple and easy to implement.

[0029] In a possible implementation of the first aspect, the thermoplastic resin includes at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, polyetherimide, polyethersulfone, polyphenylene sulfone resin and polyphthalamide.

[0030] This implementation is simple and easy to implement.

[0031] In a possible implementation manner of the first aspect, the second thermosetting resin is the same as the first thermosetting resin.

[0032] In this implementation, the appearance of the carbon fiber after the carbon fiber prepreg is cured will not be affected, and the appearance of the structural parts can present more and better pattern effects. Moreover, since the functional groups of the same resins are the same, the second thermosetting resin has better bonding strength with the first thermosetting resin during the curing process, and the resin curing can be completed at the same time, which is not easy to delaminate.

[0033] In a second aspect, an electronic device is provided, comprising the structural component in the first aspect or any possible implementation of the first aspect.

[0034] An embodiment of the present application provides an electronic device that can achieve a local or large-area high-quality metal effect with high gloss, good flatness, and excellent reliability, and also has the advantages of being light weight, low cost, high strength, good toughness, good dimensional stability, and excellent chemical resistance, and has strong product performance.

[0035] In a third aspect, a method for preparing a structural component is provided, the method comprising:

[0036] Providing a fiber prepreg; wherein the fiber prepreg comprises fibers and a first thermosetting slurry, and the fibers are doped in the first thermosetting slurry;

[0037] After forming a second slurry or laminating a second slurry film on all surfaces of the fiber prepreg, curing is performed to form a fiberboard and a second slurry layer; wherein the second slurry layer includes the second slurry, the second slurry is bonded to the first thermosetting slurry in the fiber prepreg, and the fibers are doped in the first thermosetting slurry and / or the second slurry;

[0038] A metal coating layer is formed on at least a portion of the surface of the second slurry layer; wherein the metal coating layer is combined with at least a portion of the surface of the second slurry layer, and the material of the metal coating layer includes at least one of metal and metal alloy.

[0039] An embodiment of the present application provides a method for preparing a structural part. The preparation method forms a transparent, high-temperature resistant, and high-hardness second slurry layer on the outer surface of a fiber prepreg having a thermosetting resin through high-temperature curing. The second slurry layer can be used to mask defects such as fiber grain on the surface of the carbon fiber prepreg, and the surface is smooth. At the same time, since the second slurry layer has the advantages of high-temperature resistance, low thermal expansion coefficient, and high hardness, it can be directly sputtered and coated on its surface, so as to obtain a carbon fiber structural part with high gloss, good flatness, and a high-gloss imitation metal appearance. Moreover, the metal coating layer and the second slurry layer are firmly bonded, have excellent wear resistance, and are not easy to crack or fall off. Through this preparation process, a structural part with the advantages of exquisite appearance, high-end appearance texture, light weight, high strength, good toughness, good dimensional stability, and excellent chemical resistance is obtained, and the product has strong performance. In addition, the preparation method is simple and easy to implement, and the cost is low.

[0040] The embodiments of the present application provide a structural component, a preparation method thereof, and an electronic device. By forming a second slurry layer on the outer surface of the fiber prepreg and forming a metal coating layer on part or all of the second slurry layer, the defects of the carbon fiber board can be improved by the second slurry layer tightly combined with the carbon fiber board, and the surface is smooth. At the same time, the metal coating layer can achieve a local or large-area high-quality metal effect with high gloss, good flatness, and excellent reliability, so that the structural component has the advantages of light weight, low cost, high strength, good toughness, good dimensional stability, excellent chemical resistance, etc., and the user experience is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the overall structure of an electronic device provided in an embodiment of the present application;

[0042] Figure 2 for Figure 1 Schematic diagram of the disassembled structure of the electronic device;

[0043] Figure 3 A schematic structural diagram of a mobile phone main frame provided in an embodiment of the present application;

[0044] Figure 4 A schematic structural diagram of a mobile phone sub-frame provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the overall structure of a laptop computer provided in an embodiment of the present application;

[0046] Figure 6A schematic structural diagram of the bottom surface of a laptop computer provided in an embodiment of the present application;

[0047] Figure 7 A schematic structural diagram of a black carbon fiber prepreg provided in an embodiment of the present application;

[0048] Figure 8 It is a structural schematic diagram of a structural component in the related art;

[0049] Figure 9 A schematic diagram of the surface effect of a first structural member in the related art;

[0050] Figure 10 A schematic diagram of the surface effect of a second structural member in the related art;

[0051] Figure 11 A schematic diagram of the surface effect of the third structural member in the related art;

[0052] Figure 12 Schematic diagram of the surface effect of the fourth structural member in the related art;

[0053] Figure 13 Schematic diagram of the surface effect of the fifth structural member in the related art;

[0054] Figure 14 Schematic diagram of the surface effect of the sixth structural member in the related art;

[0055] Figure 15 Schematic diagram of the surface effect of the seventh structural component in the related art;

[0056] Figure 16 Schematic diagram of the surface effect of the eighth structural member in the related art;

[0057] Figure 17 Schematic diagram of the surface effect of the ninth structural component in the related art;

[0058] Figure 18 A flow chart of a manufacturing process of a structural component provided in an embodiment of the present application;

[0059] Figure 19 A flow chart of a manufacturing process for another structural member provided in an embodiment of the present application;

[0060] Figure 20 A schematic structural diagram of a carbon fiber prepreg provided in an embodiment of the present application;

[0061] Figure 21 A schematic structural diagram of another carbon fiber prepreg provided in an embodiment of the present application;

[0062] Figure 22A schematic structural diagram of another carbon fiber prepreg provided in an embodiment of the present application;

[0063] Figure 23 A schematic structural diagram of another carbon fiber prepreg provided in an embodiment of the present application;

[0064] Figure 24 A flow chart of a manufacturing process of another structural member provided in an embodiment of the present application;

[0065] Figure 25 A flow chart of a manufacturing process for another structural member provided in an embodiment of the present application;

[0066] Figure 26 A flow chart of a manufacturing process of another structural member provided in an embodiment of the present application;

[0067] Figure 27 A schematic structural diagram of a paint layer provided in an embodiment of the present application;

[0068] Figure 28 A schematic diagram of a structure for partial painting of a structural part provided in an embodiment of the present application;

[0069] Figure 29 This is an actual rendering of a structural component provided in an embodiment of the present application.

[0070] Reference numerals:

[0071] 01-Mobile phone; 100-Display screen; 101-Middle frame; 102-Back cover; 103-Circuit board assembly; 1031-Motherboard; 1032-Components; 104-Battery; 105-Battery cover; 011-Mobile phone main frame; 012-Mobile phone sub-frame; 1011-Mobile phone middle frame non-appearance shell; 1012-Mobile phone battery compartment disassembled parts; 02-Laptop computer; 200-Laptop computer body shell facing the laptop computer cover side; 201-Laptop computer cover shell; 021-Laptop computer body bottom shell; 203-Heat dissipation vents; 204-Raised pad; 03-Structural parts; 1-Carbon fiber prepreg; 11-Carbon fiber; 12-First thermosetting resin; 3-Carbon fiber board; 4-Second slurry layer; 41-Transparent high-temperature resistant resin film; 5-Metal coating layer; 6-Paint layer; 61-Primer; 62-Middle paint; 63-Top paint. DETAILED DESCRIPTION

[0072] The following is a clear and detailed description of the technical solutions in the embodiments of the present application, with reference to the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of "or." For example, A / B can represent A or B. "and / or" in the text is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone.

[0073] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "multiple" means two or more. "At least one" means one or more.

[0074] First, some of the terms used in the embodiments of the present application are explained so that those skilled in the art can better understand them.

[0075] 1. Carbon fiber

[0076] Carbon fiber refers to a fiber material with a carbon content of more than 95%. It is composed of organic fibers such as flaky graphite crystals stacked along the fiber axis. The microcrystalline graphite material obtained through carbonization and graphitization is fibrous, soft, and black in appearance. Carbon fiber is generally not used alone. It is often fused with resins to make carbon fiber composites, in which the carbon fiber plays the main load-bearing role and the resin plays a consolidating role. This not only has the inherent intrinsic properties of carbon materials, but also has the softness and processability of textile fibers. It has high strength and modulus along the fiber axis (for example, the strength can be higher than that of steel), light weight, low density, good fatigue resistance, small thermal expansion coefficient, good corrosion resistance, good electrical and thermal conductivity, and good electromagnetic shielding properties.

[0077] 2. Carbon fiber prepreg

[0078] Carbon fiber prepreg is a high-performance composite material composed of carbon fibers and resin. The resin, a polymer compound, is used to bond the carbon fibers together, providing adhesion and support to form the overall structure. Combining the advantages of carbon fiber and resin, carbon fiber prepreg offers lightweight, high strength, high stiffness, high temperature resistance, and corrosion resistance.

[0079] 3. Carbon fiber board

[0080] Carbon fiber board is a high-strength, high-rigidity, lightweight composite material, which is formed by curing (hardening) carbon fiber prepreg.

[0081] Carbon fiber boards can be divided into two categories: woven and non-woven. The difference lies in the different production processes: woven carbon fiber boards are made by weaving raw yarns, and there is interlacing between carbon fibers; non-woven carbon fiber boards are made by fixing carbon fibers together with resins or adhesives, and the direction of carbon fibers is relatively regular.

[0082] 4. Unidirectional carbon fiber board

[0083] Unidirectional carbon fiber board refers to a board formed by curing a non-woven fabric composed of parallel fibers, in which all strength is concentrated along the extension direction (length) of the carbon fibers.

[0084] 5. Hot forging

[0085] Hot forging refers to a forging process performed above the metal's recrystallization temperature.

[0086] 6. Coating

[0087] Coating refers to the formation of a thin film on the surface of a substrate to improve surface performance, protect the surface of an object, beautify the appearance, etc.

[0088] 7. Physical vapor deposition (PVD)

[0089] Physical vapor deposition refers to the use of physical means to evaporate or sputter a solid target material in a vacuum environment, and deposit the evaporated atoms or ions onto the surface of the substrate to form a thin film. It has the advantages of good bonding between the film and the substrate, uniform and dense film, good controllable film thickness, a wide range of applicable target materials, a wide sputtering range, the ability to deposit thick films, the ability to produce metal films with stable composition, and good repeatability.

[0090] Among them, commonly used target materials include metals, alloys, ceramics and other targets.

[0091] 8. Non-conductive vacuum metallization (NCVM)

[0092] Non-conductive vacuum plating is a high-tech technology derived from ordinary vacuum electroplating. It refers to the organic conversion of materials under vacuum conditions using specific chemical, physical and other means to convert the materials into particles, which are deposited or adsorbed on the surface of the substrate to form a film.

[0093] 9. Thermal evaporation

[0094] Thermal evaporation is a technique used to deposit thin films, in which the material is heated by an electron beam or a resistance wire in a vacuum chamber and evaporated into a gaseous state, thereby directly adhering to the surface of the substrate.

[0095] 10. Magnetron sputtering coating

[0096] Magnetron sputtering coating refers to using the material as the target cathode and bombarding the target material with argon (Ar) ions to produce cathode sputtering, sputtering the target material atoms to the surface of the substrate and forming a deposited layer.

[0097] 11. Mirror effect level

[0098] Mold polishing includes grade A, grade B and grade C. Grade A polishing is one of the highest grade polishing standards, also known as mirror polishing. Grade A polishing includes grades A0, A1, A2 and A3, which refers to the mirror effect grade of the mold surface after processing.

[0099] Among them, the mold surface roughness that needs to be achieved by A0 is Ra0.008μm, the mold surface roughness that needs to be achieved by A1 is Ra0.016μm, the mold surface roughness that needs to be achieved by A2 is Ra0.032μm, and the mold surface roughness that needs to be achieved by A3 is Ra0.063μm.

[0100] The above is a brief introduction to the nouns involved in the embodiments of this application, which will not be repeated below.

[0101] The embodiments of the present application do not impose any restrictions on the specific types of electronic devices. In some embodiments, the electronic devices of the present application may include mobile phones, laptops, wearable devices (such as smart bracelets, smart watches, headphones, etc.), tablets, laptops, handheld computers, ultra-mobile personal computers (UMPCs), cellular phones, personal digital assistants (PDAs), augmented reality (AR) and virtual reality (VR) devices, and other Internet of Things (IoT) devices, in-vehicle electronic devices, and may also be televisions, large screens, printers, projectors, and other devices.

[0102] The embodiments of the present application do not limit the specific form of the above-mentioned electronic device. For convenience, the following description will first be given using a mobile phone as an example of the electronic device.

[0103] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a mobile phone 01 applicable to some embodiments of the present application. Figure 2 for Figure 1 The diagram below shows the disassembly of mobile phone 01. Figure 1 and Figure 2The mobile phone 01 shown is described as a tablet phone. In other embodiments, it can also be other types of mobile phones, such as foldable phones. Figure 1 and Figure 2 In the example of FIG, the mobile phone 01 may include a display screen 100, a middle frame 101, a rear shell 102, a circuit board assembly 103 and a battery 104. It is understood that, Figure 1 and Figure 2 The following figures and the related drawings only schematically illustrate some components of the mobile phone 01, and the actual shape, size, position and structure of these components are not affected by Figure 1 and Figure 2 and the limitations of the accompanying drawings below.

[0104] like Figure 1 and Figure 2 As shown, the display screen 100 is located on one side of the middle frame 101, and the display screen 100 can be used to display images, videos, etc. In application, the display screen 100 can be any one of a liquid crystal display (LCD), an organic light emitting diode (OLED) display screen, a sub-millimeter light emitting diode (Mini LED) display screen, a micro light emitting diode (MicroLED) display screen, etc. It should be noted that when the mobile phone 01 is a foldable mobile phone, the display screen 100 is a foldable screen, and the specific application shall prevail.

[0105] refer to Figure 2 As shown, the back cover 102 is arranged on the side of the middle frame 101 away from the display screen 100, and an internal accommodation space can be enclosed between the back cover 102 and the middle frame 101, and the internal accommodation space is used to accommodate the circuit board assembly 103 and the battery 104. The battery 104 can be used to provide power to the mobile phone 01, such as the display screen 100, the circuit board assembly 103, etc. In some embodiments, the surface of the middle frame 101 facing the back cover can be provided with a battery installation slot ( Figure 2 Not shown), the battery 104 can be installed in the battery installation slot ( Figure 2 In addition, when the battery 104 is in the battery installation slot ( Figure 2 After the battery 104 is installed (not shown), a battery cover 105 is usually placed on the surface of the battery 104 to protect the battery 104, and the specific application shall prevail.

[0106] Please refer to Figure 2The circuit board assembly 103 may include a mainboard 1031 and components 1032. Components 1032 may include, but are not limited to, cameras, speakers, microphones (microphones, Mics), chips, resistors, capacitors, inductors, potentiometers, electron tubes, heat sinks, electromechanical components, connectors, discrete semiconductors, sensors, power supplies, switches, micro motors, electronic transformers, relays, and subscriber identity modules (SIM cards). Mainboard 1031 may be used to carry components 1032 and perform signal exchange with components 1032. Figure 2 The circuit board assembly 103 is illustrated as including two components 1032. Of course, the number of components 1032 is not limited to two. In applications, the mainboard 1031 may include printed circuit boards (PCBs), flexible printed circuits (FPCs), etc.

[0107] Currently, the weight and thickness of structural components in electronic devices, such as the middle frame 101 and the battery cover 105, are reduced, which is particularly important for the lightweight and thinning of portable electronic devices such as mobile phones and laptops. Figure 3 It shows a structural diagram of a mobile phone main frame 011. Figure 4 A structural diagram of a mobile phone sub-frame 012 is shown. Figure 5 shows a schematic diagram of the overall structure of a notebook computer 02, Figure 6 A schematic structural diagram of the bottom surface 021 of a notebook computer body is shown.

[0108] like Figures 3 to 6 As shown, the mobile phone 01 has structural parts such as the mobile phone middle frame non-exterior shell 1011 and the mobile phone battery compartment detachable part 1012, and the laptop computer 02 has structural parts such as the laptop computer body shell 200 facing the laptop computer cover, the laptop computer cover shell 201 and the laptop computer body bottom shell 021. These structural parts can be processed through processes such as computerized numerical control (CNC). It should be noted that Figure 5 The laptop computer body is further provided with a keyboard 202 on the side facing the laptop computer cover. Figure 6 The bottom surface 021 of the laptop computer body is further provided with 10 heat dissipation vents 203 and 4 raised pads 204. Of course, the number of heat dissipation vents 203 and raised pads 204 is not limited thereto.

[0109] In order to take into account heat dissipation, mechanical properties and lightness, related technologies use new materials, such as resin-based carbon fiber composite materials to form the above-mentioned structural parts.

[0110] Of course, in addition to heat dissipation, mechanical properties and thinness, electronic devices are commonly used items, and a pleasing appearance can enhance user satisfaction and attract the attention of potential consumers.

[0111] In resin-based carbon fiber composite materials, the weaving pattern of carbon fiber can reflect a sense of high-end and technology. If its surface is further modified, it can also form an appearance that meets the expected requirements.

[0112] However, since the surface of resin-based carbon fiber composite materials is resin, the appearance often presents a plastic texture. At the same time, the black color of the carbon fiber in the resin-based carbon fiber composite materials is difficult to cover up. In addition, there are often problems such as uneven surface, resin enrichment, resin deficiency, black particle points, and complex processes. As a result, the formed structural parts have poor appearance refinement, a single appearance effect, and lack of differentiation, which cannot meet the product's high appearance and high texture requirements.

[0113] Conventional resin-based carbon fiber composite materials are often treated on their surface, for example, by spraying the surface to improve the appearance of the structural parts. However, the surface spraying of conventional resin-based carbon fiber composite materials is done in Figure 7 The black carbon fiber prepreg 1 is shown as a surface, for example, Figure 8 As shown, a paint layer 6 can be formed on the surface of the carbon fiber prepreg 1 by spraying paint, thereby obtaining a structural component 03. However, the appearance spraying often fails to present a high-end metallic texture, especially when light-colored spraying is performed, the appearance effect lacks the high-end texture related to metal.

[0114] Figures 9 to 17 The figure shows the appearance of a structural part 03 formed by a plurality of carbon fiber prepregs of different black colors and then sprayed with light colors, wherein: Figure 12 The surface pattern is formed by sprinkling some other fibers on the surface of the black carbon fiber prepreg and then hot pressing it (the surface pattern is the other fibers). This method is called hot forging texture, and then it is obtained by spraying paint on the surface. Figure 12 Some other images are obtained by weaving the carbon fiber itself into a pattern and then spraying the surface with paint. Figures 9 to 17 The structural part 03 can be seen in pure dark colors, gradient colors, etc., but no metallic luster can be seen, that is, the surface of the structural part 03 does not show the high-end texture related to metal, which will inevitably fail to meet the requirements of high appearance and high texture of the electronic equipment.

[0115] It should be noted that Figure 7The medium black carbon fiber prepreg 1 is the same carbon fiber prepreg 1 of the same type. It is just that the different angles lead to visual differences, so the patterns in different areas of the carbon fiber prepreg 1 are different, which is not actually the case.

[0116] Please refer to Figures 18 to 29 , a detailed introduction is given to the various structural parts 03 and their preparation methods provided in the embodiments of the present application.

[0117] like Figure 18 As shown, the embodiment of the present application provides a method for preparing a structural part, comprising the following steps:

[0118] S1. Providing fiber prepreg.

[0119] The fiber prepreg comprises fibers and a first thermosetting slurry, and the fibers are mixed in the first thermosetting slurry.

[0120] S2. After forming a second slurry or laminating a second slurry film on all surfaces of the fiber prepreg, curing is performed to form a fiberboard and a second slurry layer.

[0121] The fiberboard contains fibers and a first thermosetting slurry, the second slurry layer contains a second slurry, and the second slurry is bonded to the first slurry in the fiberboard.

[0122] S3. Forming a metal plating layer on at least a portion of the surface of the second slurry layer.

[0123] The metal coating layer is combined with at least a portion of the surface of the second slurry layer, and the material of the metal coating layer includes at least one of metal, alloy, etc.

[0124] The above steps S1 to S3 are described in detail below.

[0125] In step S1 of the embodiment of the present application:

[0126] Fiber prepreg is the raw material before fiberboard is formed. Fiber prepreg is a composite material composed of fibers and slurry, which may include carbon fiber prepreg, etc.

[0127] The following are all based on fiber prepreg Figure 7 The carbon fiber prepreg 1 shown includes carbon fiber (CF) and resin, which is described as an example, but is certainly not limited to this.

[0128] In the carbon fiber prepreg 1, the resin is mainly filled in the gaps between the carbon fiber tows, so that the resin exists on the surface of the carbon fiber tows, so that the resin covers the carbon fiber. However, when the resin is a transparent resin, the carbon fiber prepreg 1 formed by the carbon fiber and the resin still presents the original black color of the carbon fiber. Therefore, in order to obtain a carbon fiber structural part with a metallic texture, the surface treatment of the carbon fiber prepreg 1 is required.

[0129] In practice, the carbon fiber prepreg 1 is specifically composed of carbon fibers and a first thermosetting resin. The first thermosetting resin is a heat-curable, cross-linked thermosetting resin, such as at least one of epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane, and bismaleimide resin. Once the first thermosetting resin is cured and formed at a certain temperature, it will not be repeatedly formed.

[0130] Furthermore, the first thermosetting resin can be a light-colored thermosetting resin. The thermosetting resin film formed after curing can have advantages such as good bonding with the carbon fiber prepreg 1, good high-temperature resistance, high hardness, high modulus, and a high thermal expansion coefficient. For example, the thermosetting resin film formed after curing can withstand temperatures exceeding 150°C, has a hardness of F or higher, and has a modulus of 3000 mPA or higher.

[0131] In step S2 of the embodiment of the present application:

[0132] like Figure 19 As shown, the above step S2. forming a second slurry or laminating a second slurry film on all surfaces of the fiber prepreg and curing it to form a fiberboard and a second slurry layer includes:

[0133] S21. After forming a second slurry or attaching a second slurry film on all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin, curing is performed to form a carbon fiber board and a second slurry layer.

[0134] When the second slurry is formed on all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin, the second slurry may include resin, specifically at least one of a second thermosetting resin, a thermoplastic resin, and the like.

[0135] The second thermosetting resin herein may include at least one of epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane, bismaleimide resin, and the like.

[0136] The thermoplastic resin here may include at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyamide (PA), polyoxymethylene (POM), polycarbonate (PC), polyphenylene ether (PPO), polysulfone (PSF), polyetherimide (PEI), polyethersulfone (PES), polyphenylene sulfone resin (PPSU) and polyphthalamide (PPA), etc.

[0137] In specific implementation, the first thermosetting resin can be coated on all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin; or, the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin can be immersed in the first thermosetting resin. Of course, there are other ways, which are not limited here.

[0138] When the second slurry film is attached to all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin, the second slurry film may include a resin film, specifically any one of a second thermosetting resin film and a thermoplastic resin film.

[0139] Here, the second thermosetting resin film and the thermoplastic resin film are both in an uncured state, that is, the resins in the second thermosetting resin film and the thermoplastic resin film are fluid during the curing process. The second thermosetting resin film is a semi-solid second thermosetting resin film, and the thermoplastic resin film is a semi-solid thermoplastic resin film.

[0140] On the basis of the above, a second thermosetting resin and / or thermoplastic resin is formed on all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin, or, after the second thermosetting resin film or thermoplastic resin film is adhered to all surfaces of the carbon fiber prepreg composed of carbon fiber and the first thermosetting resin, the specific process of curing treatment may include: placing the structure to be cured in a mold, heating and pressurizing the structure to be cured through the mold (for example, the temperature can be greater than 120°C and the pressure can be greater than 5Mpa), and maintaining it for a period of time, then at the beginning of hot pressing, the carbon fiber prepreg and the second slurry or the second slurry film are heated at the same time, and in the middle stage of hot pressing, the second slurry in the carbon fiber prepreg is heated at the same time. A thermosetting resin and a second thermosetting resin and / or thermoplastic resin, or the resin in the second thermosetting resin film or thermoplastic resin film all begin to melt into liquids, and the second thermosetting resin and / or thermoplastic resin, or the resin in the second thermosetting resin film or thermoplastic resin film, flows into the carbon fiber prepreg, fills the gaps and micropores between the carbon fibers, and chemically reacts with the first thermosetting resin in the carbon fiber prepreg, i.e., bonds. In the final stage of hot pressing, as the temperature and pressure continue to be maintained, all the resins begin to solidify, the carbon fiber prepreg forms a carbon fiber board, and the second thermosetting resin and / or thermoplastic resin, or the second thermosetting resin film or thermoplastic resin film forms a second slurry layer.

[0141] It should be noted that since thermosetting resins themselves are ultra-high-strength adhesives, the second thermosetting resin film has good adhesion, so the semi-solid second thermosetting resin film can be placed directly on the surface of the carbon fiber prepreg. However, thermoplastic resin films have poor adhesion, so an adhesive layer is required to bond the thermoplastic resin film to the surface of the carbon fiber prepreg. After curing, a fully cured thermoplastic resin film is formed. The adhesive layer can include glue, etc. Furthermore, the adhesive layer can include transparent glue, such as optically clear adhesive (OCA).

[0142] In applications, the second thermosetting resin can be the same or different from the first thermosetting resin. When the second thermosetting resin is identical to the first thermosetting resin, for example, when both are transparent epoxy resins, the appearance of the carbon fiber prepreg after curing will not be affected, allowing the appearance of the structural component to present more and better pattern effects. Moreover, because the functional groups of the same resins are the same, the second thermosetting resin has a better bonding strength with the first thermosetting resin during the curing process, allowing the resins to be cured simultaneously and not easily delaminated.

[0143] Taking a high-temperature resistant epoxy resin film as an example, the components of the high-temperature resistant epoxy resin film are described. For example, the high-temperature resistant epoxy resin film may include epoxy resin, a curing agent, additives, and fillers. Specifically, the high-temperature resistant epoxy resin film may include component A and component B, with the weight ratio of component A to component B ranging from 3-5:1. Component A includes the following raw materials in weight percentages: epoxy resin: 70% to 80%, benzyl alcohol: 1% to 5%, reactive diluent: 1% to 5%, filler: 15% to 25%; component B includes the following raw materials in weight percentages: polyamide: 65% to 72%, benzyl alcohol: 4% to 8%, calcium carbonate: 8% to 15%, and filler: 10% to 20%.

[0144] In applications, carbon fiber prepregs can include those made from polyacrylonitrile (PAN)-based carbon fibers and pitch-based carbon fibers. PAN-based carbon fibers refer to synthetic fibers made from copolymers of PAN or acrylonitrile (AN) with a mass percentage greater than 85%; pitch-based carbon fibers refer to fibers made from materials rich in condensed aromatic hydrocarbons, such as asphalt, through polymerization, spinning, infusibility, and carbonization.

[0145] The above-mentioned PAN-based carbon fibers have high elongation, can be woven, and can be hot-forged. The conventional production process of PAN-based carbon fibers mainly includes two processes: precursor production and precursor carbonization. First, through a series of processes such as acrylonitrile polymerization and spinning, PAN fibers or precursors called "mothers" are processed; then, these precursors are placed in an oxidation furnace and oxidized at 200℃ to 300℃; finally, in a carbonization furnace, carbonization and other processes are carried out at a temperature of 1000℃ to 2000℃ to produce PAN-based carbon fibers.

[0146] Asphalt-based carbon fibers are brittle and cannot be woven. Their radial thermal conductivity can be as high as 600W / mK, which means they have better thermal conductivity. The production process of asphalt-based carbon fibers can mainly include: using methods such as blowing, centrifugation, and extrusion to melt-spin asphalt. In the blowing method, when the melt flows into the outlet of the spinneret, hot air is blown to form a certain angle with the fiber for stretching, thereby producing short asphalt fibers; in the centrifugal method, the melt is dropped into a high-speed rotating centrifuge, and the centrifugal force is used to disperse and stretch the melt into asphalt short fibers; in the extrusion method, the asphalt melt is pumped into the spinning body by a pump or nitrogen pressure, and the asphalt polycyclic aromatic hydrocarbon layer macromolecules are oriented along the fiber axis through the action of shear force and stretching force.

[0147] Since PAN-based carbon fibers have good flexibility, good elongation at break, high elongation, and can be woven, in practical applications, PAN-based carbon fibers are more conducive to forming various structural parts and are more widely used.

[0148] Figures 20 to 22 A single layer of carbon fiber prepreg 1 is taken as an example to illustrate the morphology and orientation of the carbon fibers.

[0149] like Figure 20 As shown, the carbon fiber 11 in the carbon fiber prepreg 1 is PAN-based carbon fiber, the first thermosetting resin 12 is epoxy resin, the PAN-based carbon fiber is distributed in the epoxy resin, and the extension direction of the PAN-based carbon fiber is Figure 20 In the OY direction shown, the carbon fiber prepreg 1 is a single-layer and unidirectional carbon fiber prepreg 1, that is, Figure 20 When the carbon fiber prepreg 1 shown is pulled, the mechanical properties of the PAN-based carbon fiber are good only in the extension direction along its length, that is, in the OY direction.

[0150] like Figure 21 As shown, Figure 21 and Figure 20 The only difference is that the extension direction of PAN-based carbon fiber is Figure 21 The OX direction shown in the figure is Figure 21 When the carbon fiber prepreg 1 shown is pulled, the mechanical properties of the PAN-based carbon fiber are good only in the extension direction along its length, that is, in the OX direction.

[0151] It should be noted that Figure 20 and Figure 21 The carbon fibers 11 distributed in the first thermosetting resin 12 may also be pitch-based carbon fibers, since the carbon fibers 11 are distributed unidirectionally.

[0152] In addition, the stacking angle range of the carbon fiber 11 in the first thermosetting resin 12 can be 0° to 180°, preferably 0°, 45°, 90°, etc.; the stacking angle range of the asphalt-based carbon fiber in the epoxy resin can be 0° to 180°, preferably 0°, 45°, 90°, etc., which is simple and easy to implement.

[0153] like Figure 22 As shown, Figure 22 and Figure 20 The only difference is that the extension direction of PAN-based carbon fiber is Figure 22 In the OX direction and OY direction shown, the carbon fiber prepreg 1 is a single-layer and multi-directional carbon fiber prepreg 1, and the PAN-based carbon fiber has good mechanical properties in the extension direction along its length, that is, the OX direction and the OY direction.

[0154] It should be noted that Figure 22 The multi-directional PAN-based carbon fibers shown are woven from PAN-based carbon fibers themselves. Woven PAN-based carbon fibers exhibit excellent multi-directional mechanical properties and can, of course, be woven into other patterns. Furthermore, a carbon fiber prepreg 1 composed of a single layer of woven PAN-based carbon fibers is generally thicker than a carbon fiber prepreg 1 composed of a single layer of unidirectional PAN-based carbon fibers. This is because at least two layers of fibers, upper and lower, are required for weaving, resulting in a thicker prepreg.

[0155] Of course, the number of layers of the carbon fiber prepreg 1 can also include multiple layers (at least two layers). Figure 23 FIG. 1 shows a schematic diagram of a structure in which the number of layers of carbon fiber prepreg 1 is two. Figure 23 As shown, the carbon fibers 11 of the two layers of carbon fiber prepreg 1 have the same extension direction and are both unidirectional carbon fibers 11. Of course, the carbon fibers 11 of the two layers of carbon fiber prepreg 1 may also have different extension directions, or may be woven carbon fibers 11, etc., which is not specifically limited here.

[0156] It should be noted that the types of the carbon fibers 11 in the two layers of carbon fiber prepreg 1 may be the same or different, and the types of the first thermosetting resin 12 may be the same or different, depending on actual application.

[0157] Then, the thickness of the carbon fiber board obtained by curing one or more layers of carbon fiber prepreg 1 can be greater than or equal to 0.15 mm, preferably greater than or equal to 0.3 mm, so that the mechanical properties of the carbon fiber board are better. For example, the thickness of the carbon fiber board can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0158] Through the selection and preparation of the above materials, the modulus of the second slurry layer after curing can be greater than or equal to 3000mPA, the tolerance temperature of the second slurry layer can be greater than or equal to 150°C, the thermal deformation temperature of the second slurry layer can be greater than or equal to 120°C, and the thermal expansion coefficient of the second slurry layer can be less than or equal to 60×10 -6 / K, the surface hardness of the second slurry layer can be greater than or equal to F.

[0159] For example, the modulus of the second slurry layer may be 3000 mPA, 3500 mPA, 4000 mPA, 4500 mPA, 5000 mPA or 5500 mPA.

[0160] The temperature resistance of the second slurry layer may be 150°C, 160°C, 170°C, 180°C, 190°C or 200°C, etc.

[0161] The heat deformation temperature of the second slurry layer may be 120° C., 130° C., 140° C., 150° C., 160° C., or 170° C., etc.

[0162] The thermal expansion coefficient of the second slurry layer can be 35×10 -6 / K, 40×10 -6 / K、45×10 -6 / K, 50×10 -6 / K、55×10 -6 / K or 60×10 -6 / K, etc.

[0163] It should be noted that the above-mentioned thermal expansion coefficient test meets the international standard ISO 11359. The thermal expansion coefficient is low, and the second slurry layer will not expand or contract significantly, which helps to improve the quality of the metal coating layer subsequently formed on the second slurry layer and ensure the reliability of the structural parts. Moreover, the lower thermal expansion coefficient of the second slurry layer can not only reduce the difference in thermal expansion coefficient between it and the metal coating layer, but also when the structural parts are used in high or low temperature environments, the deformation difference between the second slurry layer and the metal coating layer will not be too large, which helps to improve the structural stability between the second slurry layer and the metal coating layer, and can also avoid cracking of the metal coating layer.

[0164] The "F" mentioned above is one of the grades on the pencil hardness scale. The pencil hardness scale is typically divided into 13 grades in industry standards, descending from 6H, the hardest, to 6B, the softest. H represents hardness, and B represents darkness. 6H is the hardest and lightest, while 6B is the lowest and darkest. Furthermore, the pencil hardness test is a test method and measurement system for calibrating coating hardness. It uses pencils of varying hardness to test the coating's hardness. During the test, the pencil is held at a 45° angle to the coating and scratched approximately 1 cm long at a speed of 1 cm / s. The coating's hardness is then assessed by observing any damage. Therefore, the pencil hardness scale is an important criterion for describing both pencil lead hardness and coating hardness. The higher surface hardness of the outer surface of the second slurry layer not only helps reduce scratches on the second slurry layer but also reduces cracking in the metal coating.

[0165] The thickness of the second slurry layer after solidification may be greater than or equal to 0.1 mm, preferably greater than or equal to 0.3 mm, for example, the thickness of the second slurry layer may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm.

[0166] Therefore, the second slurry layer provided in the embodiments of the present application has good high temperature resistance, a low thermal expansion coefficient, and excellent surface hardness, which helps reduce scratches. It also has a high modulus and can be directly subjected to physical vapor deposition (without priming), making it very suitable for sputtering physical vapor deposition metallization processes. During the sputtering process, the second slurry layer can effectively improve the yield by virtue of its high heat resistance and good bonding strength of the layer formed by physical vapor deposition. The high hardness and low thermal expansion coefficient of the second slurry layer help avoid problems such as cracking of the layer formed by physical vapor deposition.

[0167] In addition, since the carbon fiber of the carbon fiber prepreg 1 itself has many defects, such as roughness and inequality, a second slurry layer is formed on the entire surface of the carbon fiber prepreg 1, and the resin in the second slurry layer is used to cover the defects of the carbon fiber prepreg 1 itself. The resin in the second slurry layer has good leveling properties, thereby achieving effects such as highlight and high gloss.

[0168] In step S3 of the embodiment of the present application:

[0169] In applications, the material of the metal coating layer may include at least one of titanium (Ti), chromium (Cr), tungsten (W), vanadium (V), niobium (Nb), zirconium (Zr), hafnium (Hf), titanium carbide (TiC) and tungsten carbide (WC).

[0170] The above-mentioned metal coating layer does not chemically react with the resin in the second slurry layer, and can be formed on part or all of the surface of the second slurry layer by physical vapor deposition, non-conductive vacuum plating, thermal evaporation, magnetron sputtering coating, ordinary spraying and water plating.

[0171] The following description will be made using physical vapor deposition as an example. Specifically, the structure of the carbon fiber prepreg composite second slurry layer can be placed in a vacuum coating machine for high-temperature sputtering coating to form a metal coating layer on the outer surface.

[0172] Since the resin in the second slurry layer contains many polar groups, the polar groups help the second slurry layer to form a strong and effective bond with the sputtered metal. Therefore, the physical vapor deposition process can be used to directly coat the outer surface of the second slurry layer, and a metallic luster can be provided. At the same time, since the hardness of the second slurry layer is relatively high and the thermal deformation temperature of the second slurry layer is greater than or equal to 120°C, that is, the resin used in the second slurry layer has high temperature resistance, which helps the second slurry layer to be subjected to high temperature sputtering coating. Moreover, since the thermal expansion coefficient of the second slurry layer is less than or equal to 60×10 -6 / K, that is, the thermal expansion coefficient of the resin in the second slurry layer is low. This not only reduces the difference in thermal expansion coefficient between the second slurry layer and the metal coating layer, helping to improve the structural stability between the second slurry layer and the metal coating layer, but also prevents cracking of the metal coating layer. This prevents the metal coating layer from experiencing homogeneous cracking after sputtering. Furthermore, due to the high-temperature sputtering, the purity is high, and the metal coating layer formed after sputtering has good density, which helps to improve the reliability of the structural parts. Furthermore, compared to the conventional process used to form metal coating layers, the high-temperature sputtering coating process is simpler and pollution-free. Furthermore, the use of physical vapor deposition can eliminate three spraying steps, which is conducive to achieving high-quality metallization effects.

[0173] The thickness of the metal coating layer may range from 0.2 μm to 8 μm. For example, the thickness of the metal coating layer may be 0.2 μm, 1 μm, 3 μm, 5 μm, 6 μm, or 8 μm. The metal coating layer is relatively thin and does not affect the overall thinness of the electronic device.

[0174] Furthermore, if Figure 24 As shown, the above step S3. forming a metal coating layer on at least a portion of the surface of the second slurry layer includes:

[0175] S31. Form a metal plating layer on the entire surface of the second slurry layer.

[0176] Figure 25 A complete process flow chart for preparing a structural component 03 provided in an embodiment of the present application is shown.

[0177] First, if Figure 25 As shown in FIG. (a), a black carbon fiber prepreg 1 is provided; then, Figure 25 As shown in FIG. 2 (b), after a transparent high-temperature resistant resin film 41 is attached to the exterior surface of the black carbon fiber prepreg 1, high-temperature curing is performed, and the black carbon fiber prepreg is cured into a carbon fiber board 3, and a second slurry layer 4 is formed on the surface of the carbon fiber board 3; finally, as shown in FIG. Figure 25 As shown in FIG. 5 ( c ), a metal coating layer 5 is formed on the second slurry layer 4 by physical vapor deposition.

[0178] The embodiment of the present application provides a method for preparing a structural part, which forms a transparent second slurry layer on the outer surface of a carbon fiber prepreg with a thermosetting resin through high-temperature curing. The second slurry layer can be used to mask defects such as fiber patterns on the surface of the carbon fiber prepreg, and the surface is smooth. At the same time, since the second slurry layer has the advantages of high temperature resistance, low thermal expansion coefficient, and high hardness, it can be directly sputtered and coated on its surface, so as to obtain a carbon fiber structural part with a high gloss, good flatness and a high-gloss imitation metal appearance. Moreover, the metal coating layer and the second slurry layer are firmly bonded, have excellent wear resistance, and are not easy to crack or fall off. Through this preparation process, a structural part with the advantages of exquisite appearance, high-end appearance texture, light weight, high strength, good toughness, good dimensional stability, and excellent chemical resistance is obtained, and the product has strong performance. In addition, the preparation method is simple and easy to implement, and the cost is low.

[0179] For example, Figure 25 (c) shows a structural member 03 provided in an embodiment of the present application.

[0180] like Figure 25 As shown in (c), the structural component 03 provided in the embodiment of the present application includes: a carbon fiber plate 3, a second slurry layer 4 and a metal coating layer 5.

[0181] Among them, the carbon fiber plate 3 includes carbon fiber, a first thermosetting resin, a second thermosetting resin and / or a thermoplastic resin, the carbon fiber is doped in the first thermosetting resin, the second thermosetting resin and / or the thermoplastic resin, and the second thermosetting resin and / or the thermoplastic resin is bonded to the first thermosetting resin.

[0182] The second slurry layer 4 covers all surfaces of the carbon fiber plate 3 . The second slurry layer 4 includes a second thermosetting resin and / or a thermoplastic resin.

[0183] The metal coating layer 5 covers at least a portion of the surface of the second slurry layer 4 . The metal coating layer 5 is combined with at least a portion of the surface of the second slurry layer 4 . The material of the metal coating layer 5 includes at least one of metal and metal alloy.

[0184] It should be noted that the carbon fiber plate 3, the second slurry layer 4 and the metal coating layer 5 in the embodiment of the present application can all refer to the above embodiment and will not be described in detail here.

[0185] Therefore, the structural component 03 of the embodiment of the present application has the following properties: the pencil hardness test of the structural component 03 is greater than or equal to 2H, the 100-grid adhesion of the structural component is greater than or equal to 4B, and the mirror effect grade of the outer surface of the structural component is less than or equal to A3.

[0186] An embodiment of the present application provides a structural component, in which the second slurry layer is tightly combined with the carbon fiber plate, and the defects of the carbon fiber plate can be improved by the second slurry layer, and the surface is smooth. At the same time, the metal coating layer on the surface of the second slurry layer can achieve a local or large-area high-quality metal effect with high gloss, good flatness, and excellent reliability, such as imitation stainless steel texture. In addition, the structural component also has the advantages of light weight, low cost, high strength, good toughness, good dimensional stability, excellent chemical resistance, etc., and the product has strong performance.

[0187] Optionally, as an implementable approach, Figure 26 A complete process flow chart for preparing a structural component 03 provided in an embodiment of the present application is shown.

[0188] First, if Figure 26 As shown in FIG. (a), a black carbon fiber prepreg 1 is provided; then, Figure 26 As shown in FIG. 2 (b), after a transparent high-temperature resistant resin film 41 is attached to the exterior surface of the black carbon fiber prepreg 1, high-temperature curing is performed, and the black carbon fiber prepreg is cured into a carbon fiber plate 3, and a second slurry layer 4 is formed on the surface of the carbon fiber plate 3; then, as shown in FIG. Figure 26 As shown in FIG. 2 (c), a metal coating layer 5 is formed on the second slurry layer 4 by physical vapor deposition; finally, as shown in FIG. Figure 26 As shown in FIG. 5 ( d ), a paint layer 6 is formed on at least a portion of the surface of the metal plating layer 5 .

[0189] Therefore, if Figure 26 As shown in Figure (d), the structural member 03 provided in the embodiment of the present application is Figure 25 The structural component 03 shown in FIG. 2 ( c ) further includes a paint layer 6 , which covers at least a portion of the surface of the metal coating layer 5 .

[0190] It should be understood that the paint layer 6 covering at least part of the surface of the metal coating layer 5 means that the paint layer 6 covers part of the surface of the metal coating layer 5; or, the paint layer 6 covers the entire surface of the metal coating layer 5, which is not specifically limited here.

[0191] For example, Figure 27As shown, the structure of the paint layer 6 may include a primer 61 and a mid-coat 62 and a topcoat 63 sequentially stacked on the primer 61 , wherein the primer 61 is in contact with the metal coating layer 5 .

[0192] In application, the primer 61 can be used as a base to facilitate the adhesion of the midcoat 62 and the topcoat 63 to the metal coating layer 5. The thickness of the primer 61 can range from 5 μm to 10 μm. For example, the thickness of the primer 61 can be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm.

[0193] The midcoat 62 can be used to support the primer 61 and the topcoat 63. The thickness of the midcoat 62 can be greater than or equal to 30 μm. For example, the thickness of the midcoat 62 can be 30 μm, 31 μm, 32 μm, 33 μm, 34 μm or 35 μm.

[0194] The topcoat 63 can give the structural member 03 a final pattern effect, etc. The thickness of the topcoat 63 can range from 15 μm to 30 μm. For example, the thickness of the topcoat 63 can be 15 μm, 17 μm, 20 μm, 24 μm, 28 μm, or 30 μm.

[0195] like Figure 28 As shown in Figure (a), local painting is performed on the surface of the metal coating layer 5 of the structural part 03, and the surface of the metal coating layer 5 can be obtained as shown in Figure (a). Figure 28 The paint layer 6 with local shielding effect shown in Figure (b) is shown.

[0196] It should be noted that Figure 29 This is a structural diagram of a carbon fiber exterior part with a partial metallic texture. Figure 29 It can be clearly seen that the structural component 03 has a very good metallic texture.

[0197] In addition, the paint layer 6 can also help the metal coating layer 5 have different colors. Specifically, different colors can be obtained by selecting different paint layer 6 materials, which helps to achieve personalized design of the structural part 03.

[0198] The following are various decorative color coatings made by commonly used materials and commonly used gases through physical vapor deposition vacuum coating: 1. Zirconium target + nitrogen: yellow-green to golden yellow; 2. Zirconium target + methane: dark and light black; 3. Zirconium target + oxygen: white, transparent; 4. Zirconium target + nitrogen + methane: gold, imitation rose gold; 5. Chromium target + methane: dark and light black; 6. Chromium target + nitrogen: light black; 7. Chromium target + nitrogen + methane: silver gray; 8. Chromium target + oxygen: light yellow, purple, green; 9. Chromium target + oxygen: silver.

[0199] An embodiment of the present application provides a structural part that has a local metallic texture and can obtain a spliced ​​structural part with a local metallic texture by masking a partial area of ​​the surface of the metal coating layer and then spraying a paint layer, making the product appearance more diversified and meeting the needs of more consumers.

[0200] The above only introduces the content related to the invention. The rest of the content can be obtained by referring to the relevant technology and will not be described in detail here.

[0201] It should be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples, those skilled in the art can obviously make various equivalent modifications or changes. Or a combination of any two or any multiple of the above embodiments. Such modifications, changes, or combinations also fall within the scope of the embodiments of the present application.

[0202] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0203] It should also be understood that the division of the modes, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various modes, categories, situations and embodiments can be combined without contradiction.

[0204] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0205] Finally, it should be noted that the above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be covered by the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A structural member, characterized in that: include: Fiberboard, second slurry layer and metal coating layer; The fiberboard includes a first thermosetting slurry, a second slurry, and fibers, wherein the fibers are mixed in the first thermosetting slurry and / or the second slurry, and the first thermosetting slurry is bonded to the second slurry; The second slurry layer includes the second slurry and covers all surfaces of the fiberboard; The metal coating layer covers at least a portion of the surface of the second slurry layer and is combined with at least a portion of the surface of the second slurry layer. The material of the metal coating layer includes at least one of metal and metal alloy.

2. The structural member according to claim 1, characterized in that The fiberboard includes a carbon fiber board; The metal coating layer covers the entire surface of the second slurry layer, and the material of the metal coating layer includes at least one of titanium, chromium, tungsten, vanadium, niobium, zirconium, hafnium, titanium carbide and tungsten carbide.

3. The structural member according to claim 2, characterized in that The carbon fiber plate includes carbon fibers and a first thermosetting resin, wherein the carbon fibers are doped in the first thermosetting resin; The second slurry of the second slurry layer includes a second thermosetting resin, and the second slurry layer composed of the second thermosetting resin is directly bonded to the carbon fiber board.

4. The structural member according to claim 2, characterized in that The structural member further includes an adhesive layer; The carbon fiber plate includes carbon fibers and a first thermosetting resin, wherein the carbon fibers are doped in the first thermosetting resin; The second slurry of the second slurry layer includes a thermoplastic resin, and the second slurry layer composed of the thermoplastic resin is bonded to the carbon fiber plate through the adhesive layer.

5. The structural member according to any one of claims 1 to 4, characterized in that The structural component further includes a paint layer, which covers at least a portion of the surface of the metal coating layer.

6. The structural member according to any one of claims 1 to 5, characterized in that The pencil hardness test of the structural member is greater than or equal to 2H; and / or, The hundred-grid adhesion of the structural member is greater than or equal to 4B; and / or, The mirror effect grade of the structural part is less than or equal to A3.

7. The structural member according to any one of claims 1 to 6, characterized in that: The metal coating layer is prepared by at least one of physical vapor deposition, non-conductive vacuum plating, thermal evaporation, magnetron sputtering coating, ordinary spraying and water plating.

8. The structural member according to any one of claims 1 to 7, characterized in that The modulus of the second slurry layer is greater than or equal to 3000 mPA; and / or, The second slurry layer has a temperature tolerance greater than or equal to 150°C; and / or, The heat deformation temperature of the second slurry layer is greater than or equal to 120°C; and / or, The thermal expansion coefficient of the second slurry layer is less than or equal to 60×10 -6 / K; and / or, The surface hardness of the second slurry layer is greater than or equal to F.

9. The structural member according to any one of claims 1 to 8, characterized in that The thickness of the metal coating layer ranges from 0.2 μm to 8 μm.

10. The structural member according to any one of claims 1 to 9, characterized in that The structural member includes any one of a middle frame, a battery cover, and a shell.

11. An electronic device, characterized in that: The invention comprises the structural member according to any one of claims 1 to 10.

12. A method for preparing a structural part, characterized in that: include: Providing a fiber prepreg; wherein the fiber prepreg comprises fibers and a first thermosetting slurry, and the fibers are doped in the first thermosetting slurry; After forming a second slurry or laminating a second slurry film on all surfaces of the fiber prepreg, curing is performed to form a fiberboard and a second slurry layer; wherein the second slurry layer includes a second slurry, the second slurry is bonded to the first thermosetting slurry in the fiber prepreg, and the fibers are doped in the first thermosetting slurry and / or the second slurry; A metal coating layer is formed on at least a portion of the surface of the second slurry layer; wherein the metal coating layer is combined with at least a portion of the surface of the second slurry layer, and the material of the metal coating layer includes at least one of metal and metal alloy.

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