Composite structural parts and electronic equipment

Abstract

The present application discloses a composite material structural component and electronic device, which relates to the technical field of electronic devices and is used to solve the problem that it is difficult for components to meet the requirements of structural strength and lightness. Among them, the composite material structural component includes a substrate, a transition layer and an appearance layer. The substrate includes multiple layers of first fiber cloth and a first resin matrix. The multiple layers of first fiber cloth are stacked and embedded in the first resin matrix. The substrate includes a first surface, and the substrate has a first preset color. The L value corresponding to the first preset color in the Lab color space is L1. The transition layer is stacked on the first surface, and the transition layer includes a second surface facing away from the first surface. The transition layer has a second preset color. The L value corresponding to the second preset color in the Lab color space is L2, and L2 is greater than L1. The appearance layer is stacked on the second surface, and the transition layer has a third preset color. The L value corresponding to the third preset color in the Lab color space is L3, and L3 is greater than L1.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a composite material structural component and electronic equipment. Background Art

[0002] Electronic devices such as mobile phones, tablets, and other electronic devices often have components that protect the circuit components within them. Examples include the middle frame in mobile phones and the C-shell and D-shell cases in laptops. These components struggle to achieve both structural strength and thinness, requiring further improvement. Summary of the Invention

[0003] Embodiments of the present application provide a composite material structural component and an electronic device, wherein the composite material structural component is used to solve the problem of components having difficulty in achieving both structural strength and lightness.

[0004] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, embodiments of the present application provide a composite structural member comprising a substrate, a transition layer, and an exterior layer. The substrate comprises multiple layers of a first fiber cloth and a first resin matrix, wherein the multiple layers of the first fiber cloth are stacked and embedded in the first resin matrix. The substrate comprises a first surface and exhibits a first predetermined color. The first predetermined color corresponds to an L value of L1 in the Lab color space. The substrate exhibits high strength and is lightweight.

[0006] The transition layer is laminated on the first surface, the transition layer including a second surface facing away from the first surface, the transition layer having a second predetermined color, the second predetermined color corresponding to an L value of L2 in the Lab color space, where L2 is greater than L1. The appearance layer is laminated on the second surface, the appearance layer having a third predetermined color, the third predetermined color corresponding to an L value of L3 in the Lab color space, where L3 is greater than L1.

[0007] L2 being greater than L1 means the second preset color is lighter than the first preset color; that is, the color of the transition layer is lighter than the color of the substrate. L3 being greater than L1 means the third preset color is lighter than the first preset color; that is, the color of the exterior layer is lighter than the color of the substrate. This allows the transition layer to serve as an intermediate layer, effectively covering the darker substrate, allowing the lighter exterior layer to more easily cover the darker substrate. This results in a uniform color for the exterior layer, avoiding the problem of uneven color in the composite structural component. This improves the aesthetics of the composite structural component, presenting a good visual effect to the user and enhancing the user experience.

[0008] Moreover, the transition layer is provided on the first surface, and surface unevenness problems such as resin enrichment, resin deficiency, and black particle spots on the first surface can be covered by the transition layer, thereby avoiding the problem that the appearance layer is difficult to adhere to the substrate due to the unevenness of the first surface.

[0009] In one possible implementation of the first aspect, the hardness of the substrate is greater than that of the transition layer. This makes polishing the second surface of the transition layer easier, thereby simplifying the processing of the composite material structural component, thereby improving the yield rate of the composite material structural component and reducing the processing cost of the composite material structural component.

[0010] In one possible implementation of the first aspect, the first fiber cloth includes at least one of carbon fiber, glass fiber, graphite fiber, carbon nanotube fiber, graphene fiber, alumina fiber, silicon carbide fiber, silicon nitride fiber, and boron nitride fiber. These materials all have a tensile strength greater than 1000 MPa and a flexural strength greater than 1000 MPa, thus providing high structural strength.

[0011] As a result, when the first fiber cloth is the aforementioned type, it has high structural strength and hardness, thereby enhancing the structural strength and hardness of the substrate. When the electronic device is dropped or impacted, the composite material components are subjected to stress impacts. The composite material components, with their high structural strength and hardness, resist these stress impacts and prevent deformation.

[0012] In a possible implementation of the first aspect, the transition layer includes a second resin matrix and a filler, the filler is distributed in the second resin matrix, the filler is a fourth preset color, and the L value corresponding to the fourth preset color in the Lab color space is L4, and L4 is greater than or equal to L2.

[0013] In this way, the transition layer is formed from a resin matrix, and the second resin matrix covers the first surface of the substrate. Specifically, the second resin matrix can fill the pits on the first surface and cover the protrusions on the first surface, thereby avoiding the uneven appearance caused by the appearance layer directly contacting the first surface. Furthermore, the second resin matrix is ​​made of resin, and its hardness is lower than that of the substrate. It is also easier to polish than the substrate to obtain a smooth second surface, thereby improving the flatness of the appearance layer after it is applied to the second surface.

[0014] The transition layer is colored to match the light color described in the previous embodiment by incorporating fillers into the second resin matrix. When the exterior layer is laminated onto the second surface, the light-colored transition layer prevents the exterior layer from being visible, thereby improving the color uniformity of the exterior layer and further enhancing the aesthetics of the composite material structure.

[0015] In one possible implementation of the first aspect, both the first resin matrix and the second resin matrix are thermosetting materials, and the surface of the transition layer facing the substrate is bonded to the substrate to form a single structural component. In this manner, the first resin matrix and the second resin matrix are directly cured to form a single structural component, eliminating the need for an additional connector, such as adhesive, between the substrate and the transition layer. This reduces the overall thickness of the composite structural component.

[0016] In a possible implementation of the first aspect, the interlayer bonding force between the second resin matrix and the first resin matrix is ​​greater than or equal to 1.5 MPa. When the interlayer bonding force between the second resin matrix and the first resin matrix is ​​within the above range, the bonding force between the substrate and the transition layer is relatively high, which can enhance the overall strength and stiffness of the composite structural member, so that the composite structural member can maintain structural integrity when subjected to external loads, and especially avoid the problem of misalignment between the substrate and the transition layer when the composite structural member is subjected to shear force. This ensures that the composite structural member remains stable when subjected to force or environmental changes, avoiding the risk of structural deformation and damage. The durability of the composite structural member is improved, and the maintenance and repair costs caused by structural damage are reduced.

[0017] Furthermore, when the interlayer bonding strength between the second resin matrix and the first resin matrix is ​​within the above range, the smoothness of the interface between the substrate and the transition layer can be ensured, defects such as unevenness or delamination can be reduced, and the aesthetics of the composite material structure can be improved.

[0018] Furthermore, when the bonding force between the first resin matrix and the second resin matrix is ​​within the above range, dust, moisture and other fine particles can be prevented from entering between the substrate and the transition layer, thereby ensuring the tight bonding between the substrate and the transition layer, and avoiding the performance degradation of the composite material structural parts due to environmental factors (such as temperature changes, humidity, chemical erosion, etc.) during use.

[0019] In one possible implementation of the first aspect, the material of the first resin matrix is ​​the same as the material of the second resin matrix. This results in a higher bonding strength between the first and second resin matrices, and consequently, a higher bonding strength between the substrate and the transition layer. This improves the overall structural strength of the composite structural component. When the composite structural component is dropped or impacted, stress and load can be better transferred between the substrate and the transition layer, allowing the substrate and transition layer to jointly resist external impacts, thereby improving the impact resistance of the composite structural component.

[0020] In one possible implementation of the first aspect, the first resin matrix is ​​at least one of an epoxy resin, an unsaturated polyester resin, a phenolic resin, a polyurethane, and a bismaleimide resin. These thermosetting resin materials have high strength, are relatively low in cost, and have relatively mature processing technologies, facilitating the processing of the substrate and transition layer, thereby improving the processing efficiency of the composite structural component.

[0021] In one possible implementation of the first aspect, the second resin matrix is ​​a thermoplastic material, and the composite structural component further includes an adhesive portion, through which the transition layer is bonded to the substrate. This allows for a wider range of material options for the second resin matrix and a wider range of processing techniques for the transition layer, allowing the composite structural component to select a transition layer material suitable for the substrate material. The adhesive portion provided between the transition layer and the substrate can enhance the bonding strength between the substrate and the transition layer, thereby improving the overall structural stability of the composite structural component.

[0022] In one possible implementation of the first aspect, the second resin matrix includes at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene oxide, polysulfone, polyetherimide, polyethersulfone, polyphenylene sulfone resin, and polyphthalamide. These thermoplastic resin materials have high strength, low cost, and mature processing technology, facilitating the formation of the transition layer, thereby improving the processing efficiency of the composite structural component.

[0023] In one possible implementation of the first aspect, the filler includes at least one of titanium dioxide, white carbon black, calcium carbonate, kaolin, talc, and mica. The addition of the filler allows the transition layer to exhibit a white appearance. Since white is the lightest color, when a light-colored exterior layer is disposed over the transition layer, the exterior layer can obscure the transition layer. The white transition layer does not interfere with the color of the exterior layer, resulting in a uniform color for the exterior layer and enhancing the aesthetics of the composite structural component.

[0024] In one possible implementation of the first aspect, the filler is a surface-modified filler to increase compatibility with the second resin matrix. Thus, by surface-modifying the filler, the surface energy of the filler can be adjusted to better match the surface energy of the second resin matrix. This helps better disperse the filler in the second resin matrix, reduces interfacial gaps and interfacial tension between the filler and the second resin matrix, enhances interfacial adhesion between the filler and the second resin matrix, and improves compatibility between the filler and the second resin matrix.

[0025] In one possible implementation of the first aspect, the transition layer comprises multiple layers of a second fiber cloth and a second resin matrix, the multiple layers of second fiber cloth being stacked and embedded in the second resin matrix. This allows the transition layer to be a light-colored fiberboard, effectively covering the darker substrate. This also allows the light-colored exterior layer to more easily cover the darker substrate, resulting in a uniform color for the exterior layer and avoiding color unevenness in the composite structural component. This improves the aesthetics of the composite structural component, presenting a pleasant visual experience to the user and enhancing the user experience.

[0026] Moreover, the hardness of the second fiber cloth is lower than that of the first fiber cloth. Compared with directly polishing the first surface of the substrate, the transition layer composed of the second fiber cloth and the second resin matrix is ​​easier to polish, which is beneficial to improving the processing efficiency of the composite material structural parts.

[0027] In one possible implementation of the first aspect, the second fiber cloth comprises at least one of glass, ceramic, aramid, and polyethylene. Glass fiber, ceramic fiber, aramid fiber, and polyethylene fiber are nearly white in color, and the transition layer composed of the second fiber cloth also appears white. This prevents the color of the transition layer from being visible through the exterior layer, resulting in a uniform exterior layer color, which improves the aesthetics of the composite structural component.

[0028] In a possible implementation manner of the first aspect, a material of the first fiber cloth is different from a material of the second fiber cloth.

[0029] In one possible implementation of the first aspect, the roughness of the second surface is greater than or equal to 0.2 microns and less than or equal to 10 microns, providing a smooth surface for subsequent installation of the exterior layer, thereby improving the aesthetics of the exterior layer and improving the smoothness of the exterior layer of the composite material structural component after it is installed on the transition layer.

[0030] In one possible implementation of the first aspect, L1 is greater than or equal to 0 and less than or equal to 30. The color of the first fiber cloth is related to the structural strength and material of the first fiber cloth. Thus, when the L1 value of the first fiber cloth is within the above range, it is configured to be compatible with the structural strength and material of the first fiber cloth, so that the first fiber cloth meets the requirements for structural strength and hardness.

[0031] In one possible implementation of the first aspect, L2 is greater than or equal to 90 and less than or equal to 100. Thus, when the L2 value is within the above range, the color of the transition layer is relatively light. The exterior layer is disposed on the second surface of the transition layer. If the exterior layer is light-colored, the exterior layer can also cover the light-colored transition layer. The transition layer is relatively light in color and cannot be seen through the exterior layer. Therefore, the exterior layer can exhibit a pleasant color, thereby enhancing the aesthetics of the composite structural component.

[0032] In one possible implementation of the first aspect, the a value corresponding to the first preset color in the Lab color space is a1, the b value corresponding to the first preset color in the Lab color space is b1, a1 is greater than or equal to -30 and less than or equal to 30, and b1 is greater than or equal to -30 and less than or equal to 30. Thus, when the a1 and b1 values ​​of the first fiber cloth are within the above ranges, they are configured to suit the structural strength and material of the first fiber cloth, so that the first fiber cloth meets structural strength and hardness requirements.

[0033] In one possible implementation of the first aspect, the a value corresponding to the second preset color in the Lab color space is a2, and the b value corresponding to the second preset color in the Lab color space is b2. a2 is greater than or equal to -30 and less than or equal to 30, and b2 is greater than or equal to -30 and less than or equal to 30. Thus, when the L2 value is within the above range, the transition layer has a lighter color. The exterior layer is disposed on the second surface of the transition layer. If the exterior layer is light-colored, the exterior layer can also cover the light-colored transition layer. The transition layer has a lighter color and is not visible through the exterior layer. Therefore, the exterior layer can exhibit a good color, thereby improving the aesthetics of the composite material structural component.

[0034] In a second aspect, an embodiment of the present application further provides a housing of an electronic device, at least a portion of which is the composite material structural member described above.

[0035] In a third aspect, an embodiment of the present application further provides an electronic device comprising a housing, a display, and a host, wherein the housing is the housing described above and comprises a first housing and a second housing. The first housing is the housing of the display, and the second housing is the housing of the host.

[0036] In a fourth aspect, an embodiment of the present application further provides a method for processing a composite material structural member, the method comprising the following steps:

[0037] Providing a first fiber prepreg; the first fiber prepreg has a first preset color, the first preset color corresponds to an L value of L1 in the Lab color space, and the first fiber prepreg includes a first surface;

[0038] Providing a transition layer having a second preset color, wherein the second preset color corresponds to an L value of L2 in the Lab color space, L2 being greater than L1, the transition layer being stacked on the first surface, and the transition layer including a second surface facing away from the first surface;

[0039] An appearance layer is provided, wherein the appearance layer is stacked on the second surface.

[0040] In a possible implementation of the fourth aspect, the transition layer includes a second resin matrix and a filler, the filler is distributed in the second resin matrix, and the interlayer bonding force between the second resin matrix and the first resin matrix is ​​greater than or equal to 1.5 MPa.

[0041] In a possible implementation of the fourth aspect, the second resin matrix is ​​a thermosetting material, and the transition layer and the substrate are an integral structural component.

[0042] In a possible implementation of the fourth aspect, the second resin matrix is ​​a thermoplastic material, and after curing the first fiber prepreg and before providing the transition layer, the processing method further includes:

[0043] An adhesive portion is provided, the adhesive portion is arranged on the first surface, and the transition layer is arranged on a side of the adhesive portion facing away from the first surface.

[0044] In a possible implementation of the fourth aspect, the transition layer includes a second resin matrix and a second fiber cloth, the second fiber cloth is distributed in the second resin matrix, and the interlayer bonding force between the material of the second resin matrix and the material of the first resin matrix is ​​greater than or equal to 1.5 MPa.

[0045] In a possible implementation of the fourth aspect, after providing the transition layer and before providing the appearance layer, the processing method further includes:

[0046] Cleaning the second surface to remove impurities, grease and dust on the second surface;

[0047] The second surface is polished to remove scratches, pits and surface unevenness of the second surface.

[0048] Among them, the technical effects brought about by any design method in the second aspect, the third aspect and the third aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0050] Figure 2 for Figure 1 An exploded view of the electronic device shown in;

[0051] Figure 3 A schematic diagram of the structure of a composite material structural member provided in some embodiments of the present application;

[0052] Figure 4 for Figure 3 A schematic structural diagram of a substrate in the composite material structural member shown;

[0053] Figure 5Provides structural schematic diagrams of composite material structural parts for some other embodiments of the present application;

[0054] Figure 6 A structural diagram of a substrate in a composite material structural member provided in some embodiments of the present application;

[0055] Figure 7 A schematic diagram of the structure of a composite material structural member provided in some embodiments of the present application;

[0056] Figure 8 A coordinate diagram of color and L value in the Lab color space referenced by the composite material structural members provided in some embodiments of the present application;

[0057] Figure 9 A coordinate diagram of color and a value in the Lab color space referenced by the composite material structural members provided in some embodiments of the present application;

[0058] Figure 10 A coordinate diagram of color and b value in the Lab color space referenced by the composite material structural members provided in some embodiments of the present application;

[0059] Figure 11 A schematic structural diagram of a transition layer provided in some embodiments of the present application;

[0060] Figure 12 A diagram illustrating the processing of composite structural parts provided in some embodiments of the present application;

[0061] Figure 13 A schematic diagram of the structure of a composite material structural member provided in some embodiments of the present application;

[0062] Figure 14 A diagram showing the processing of composite material structural parts according to some other embodiments of the present application;

[0063] Figure 15 A diagram showing the processing of composite material structural parts provided in some further embodiments of the present application;

[0064] Figure 16 Schematic diagram of the structure of composite material structural parts provided in some further embodiments of the present application.

[0065] Reference numerals:

[0066] 100. Electronic equipment;

[0067] 10. Display; 11. Display screen; 12. First housing;

[0068] 20. Host; 21. Host body; 211. Second housing; 211a. C housing; 211b. D housing; 22. Keyboard; 23. Touchpad;

[0069] 30. Composite material structural member; 31. Substrate; 311. First fiber cloth; 312. First resin matrix; 31a. First surface;

[0070] 32. Appearance layer; 321. Primer; 322. Intermediate paint; 323. Topcoat;

[0071] 33, transition layer; 33a, second surface; 331, second resin matrix; 332, filler;

[0072] 34. First fiber prepreg; 36. Adhesive portion;

[0073] 37. Second fiber prepreg; 371. Second fiber cloth; 38. First blank. DETAILED DESCRIPTION

[0074] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features.

[0075] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0076] The present application provides an electronic device, which includes but is not limited to mobile phones, electronic devices, laptop computers, personal digital assistants (PDAs), personal computers, vehicle-mounted devices and other electronic devices and accessories of these electronic devices (such as tablet computer stands, protective cases, etc.).

[0077] See also Figure 1 and Figure 2 , Figure 1 A schematic structural diagram of an electronic device 100 provided in some embodiments of the present application; Figure 2 for Figure 1 FIG1 is an exploded view of an electronic device 100. In this embodiment, the electronic device 100 is a notebook computer. In this embodiment, the electronic device 100 includes a display 10 and a host 20.

[0078] The display 10 includes a display screen 11 and a first housing 12. The display screen 11 is used to display images, videos, and the like. The display screen 11 can be a flexible or rigid display screen. The first housing 12 is used to protect the display screen 11. The first housing 12 can cover the edges of the display screen 11 and the back of the display screen 11.

[0079] The host 20 includes a host body 21, a keyboard 22, and a touchpad 23. The keyboard 22 and touchpad 23 are located on the host body 21. The keyboard 22 is used to input commands or data. The touchpad 23 can function as a mouse, utilizing touch actions (including swiping and clicking) to control the cursor on the display 10, thereby performing mouse operations such as "cursor navigation," "selection," and "confirmation."

[0080] The main body 21 includes a second housing 211 and electronic components. The second housing 211 comprises a C-shell 211a and a D-shell 211b, which together form a housing. The housing houses the electronic components, including but not limited to a processor and memory. The main body 21 controls the display 10 to display images and videos based on commands or data input from the keyboard 22. It also controls the cursor on the display 10 based on touch input from the touchpad 23.

[0081] The host body 21 is hinged to the display 10. In some embodiments, the host body 21 is hinged to the first housing 12 of the display 10 via the second housing 211. In other embodiments, the host body 21 may also be hinged to other parts of the display 10 via other parts.

[0082] The electronic device 100 can be switched between an open state and a closed state. When the electronic device 100 is in the open state, the display 10 and the host 20 form an angle greater than 0° and less than 180°. When the electronic device 100 is in the closed state, the display 10 covers the host 20, and the display surface of the display 10 faces the keyboard surface of the host 20.

[0083] To facilitate the description of the following embodiments, an XYZ coordinate system is established for the electronic device 100. Specifically, the direction extending from the rotation axis of the host 20 and the display 10 is defined as the X-axis direction, the thickness direction of the display 10 is defined as the Z-axis direction, and the direction perpendicular to both the X-axis and the Z-axis directions is defined as the Y-axis direction. It will be appreciated that the coordinate system of the display 10 can be flexibly configured according to actual needs and is not specifically limited here.

[0084] As can be seen from the above description, the first housing 12 serves as the top cover of the electronic device 100. The first housing 12 covers the display screen 11 and, when closed, covers the keyboard 22 and touchpad 23. The first housing 12 protects the display screen 11 and, when closed, the keyboard 22, touchpad 23, and the main body of the electronic device.

[0085] The second housing 211 serves as the bottom shell of the electronic device 100. It encloses the main body and, when closed, covers the display 11, keyboard 22, and touchpad 23. The second housing 211 protects the main body and, when closed, the keyboard 22, touchpad 23, and display 11. Furthermore, when the electronic device 100 is in use, the second housing 211 is located at the bottom of the electronic device 100 and provides support, ensuring the stability of the electronic device 100 during use.

[0086] Therefore, as protective components of the electronic device 100, the first housing 12 and the second housing 211 are required to have high structural strength to protect the internal components of the electronic device 100. The material of the first housing 12 and the second housing 211 is mostly metal, which has sufficient structural strength to improve the stress resistance of the electronic device 100.

[0087] However, metal is heavy, which increases the overall weight of the electronic device 100, making it inconvenient to carry. Therefore, to ensure the electronic device 100 is lightweight and thin, while also maintaining high structural strength, some embodiments of the present application provide a composite material structural member 30, which is used to form at least one of the first housing 12 and the second housing 211 described above. In some embodiments, only the first housing 12 is formed from the composite material structural member 30; in other embodiments, only the second housing 211 is formed from the composite material structural member 30; and in still other embodiments, both the first housing 12 and the second housing 211 are formed from the composite material structural member 30.

[0088] The following description will take the example that the material of the first shell 12 and the material of the second shell 211 are both formed by the composite material structural member 30, and the material of the first shell 12 is consistent with the material of the second shell 211, and the following description will take the first shell 12 as an example.

[0089] See also Figure 3 , Figure 3Schematic diagram of a composite structural member 30 provided in some embodiments of the present application. Composite structural member 30 includes a substrate 31 and an exterior layer 32. Exterior layer 32 is laminated on a first surface 31a of substrate 31. Substrate 31 supports and protects electronic device 100, while exterior layer 32 provides an aesthetically pleasing appearance for electronic device 100.

[0090] See also Figure 4 , Figure 4 for Figure 3 The schematic diagram of the structure of the substrate 31 in the composite material structural member 30 is shown. The substrate 31 includes multiple layers of first fiber cloth 311 and a first resin matrix 312. The multiple layers of first fiber cloth 311 are stacked and embedded in the first resin matrix 312.

[0091] The substrate 31 is made of fiberboard, specifically multiple layers of first fiber cloth 311 and first resin matrix 312. The fiberboard is formed by curing fiber prepreg, a semi-cured composite material used in the production of composite materials. It consists of continuous fibers or cloth pre-impregnated with resin.

[0092] Fiberboard is typically lighter than metal or plastic housings, helping to reduce the overall weight of electronic device 100 and improve portability. The continuous fibers in fiberboard provide high strength and stiffness, enabling it to withstand high impact and pressure. Fiber prepregs are also generally more durable than metal or plastic, resisting wear and tear and the effects of prolonged use.

[0093] Due to the high strength and stiffness of the fiber prepreg, the composite material structural member 30 prepared from the prepreg also has high structural strength and stiffness. The first shell 12 and the second shell 211 formed by the composite material structural member 30 have good impact resistance. When the electronic device 100 falls or collides, the first shell 12 and the second shell 211 provide good protection for the electronic components inside the electronic device 100, thereby avoiding the risk of damage to the electronic device 100.

[0094] The substrate 31 includes a first surface 31a, onto which an exterior layer 32 is laminated. The exterior layer 32 can be provided in various colors and gloss levels according to design requirements, thereby enhancing the aesthetics and appeal of the composite structural member 30. For example, the exterior layer 32 can be black, gray, dark gray, pure white, off-white, pink, light blue, and the like.

[0095] Most fiber prepregs are dark in color. For example, carbon fiber prepregs are typically black or dark gray, while silicon carbide fiber prepregs and basalt fiber prepregs are typically dark gray. When the exterior layer 32 needs to have a darker appearance, such as black or dark gray, the exterior layer 32 can easily mask the color of the substrate 31 due to its similar color to the substrate 31, resulting in the composite structural member 30 appearing in a color that meets the design requirements.

[0096] See also Figure 5 , Figure 5 Schematic diagrams of composite structural members 30 are provided for further embodiments of the present application, wherein the exterior layer 32 is light-colored. When the composite structural member 30 is desired to be light-colored, that is, the exterior layer 32 is desired to be light-colored, such as pure white, off-white, pink, light blue, and the like.

[0097] In this way, the light color of the appearance layer 32 is difficult to cover the dark color of the substrate 31, and the dark color of the substrate 31 may be transmitted through the appearance layer 32. Especially under light irradiation, the composite material structural component 30 presents an uneven color problem, thereby reducing the aesthetics of the composite material structural component 30 and further reducing the user experience.

[0098] See also Figure 6 , Figure 6 This diagram illustrates the structure of a substrate 31 in a composite structural member 30 provided in some embodiments of the present application. Furthermore, since substrate 31 is composed of a first fiber cloth 311 and a first resin matrix 312, the fibers in first fiber cloth 311 are tightly arranged in a woven pattern to meet high structural strength requirements. This staggered arrangement of the fibers causes the first resin matrix 312, which is coated on the first fiber cloth 311, to have uneven surfaces, resulting in poor flatness of first surface 31a.

[0099] Therefore, the substrate 31 may have the following problems, including but not limited to: first, there may be pits, scratches or other irregular shapes on the surface of the substrate 31, which may affect the flatness of the substrate 31. Second, during the processing of the composite structural part 30, the resin may accumulate excessively in certain areas, especially on the surface or edge of the substrate 31, which may lead to resin enrichment problems. Third, during the processing of the composite structural part 30, some areas may not be fully filled with resin, resulting in resin loss. Fourth, due to the presence of impurities on the surface or inside of the substrate 31, such as dust, fiber debris, etc., these impurities are wrapped by the resin during the curing process, resulting in black particle spots.

[0100] The technical issues of this embodiment will be described below from the perspective of a method for processing the composite material structural member 30 .

[0101] In order to improve the flatness of the surface of the substrate 31 , before the exterior layer 32 is disposed on the substrate 31 , the first surface 31 a of the substrate 31 needs to be polished to obtain a flat first surface 31 a for facilitating the disposition of the exterior layer 32 .

[0102] Specifically, the first surface 31a is wiped to remove dust, oil, and other impurities on the first surface 31a in preparation for polishing. The first surface 31a is inspected for defects such as pits, scratches, resin accumulation, or resin loss. The first surface 31a is polished to remove pits, scratches, resin accumulation, and resin loss on the first surface 31a, thereby improving the flatness of the first surface 31a. The first surface 31a can be polished using sandpaper of varying coarseness or fineness, or using a polishing wheel or a grinder. After polishing the first surface 31a, dust and debris generated during the polishing process are removed from the first surface 31a in preparation for subsequent steps.

[0103] Through the above steps, the flatness of the first surface 31 a can be effectively improved, providing a good foundation for the subsequent formation of the appearance layer 32 by coating and painting.

[0104] However, due to the high hardness of substrate 31, polishing of substrate 31 takes a long time, resulting in low production efficiency of composite structural component 30. Furthermore, due to the high hardness of substrate 31, polishing of substrate 31 is difficult, making it difficult to achieve the desired flatness and smoothness on the surface of substrate 31. The yield rate is only 60%-70%, increasing the processing cost of composite structural component 30.

[0105] In summary, due to the dark color of the substrate 31 itself and the uneven surface of the substrate 31 , the appearance of the composite material structural component 30 is not good after the appearance layer 32 is disposed on the first surface 31 a .

[0106] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of a composite structural member 30 provided in some embodiments of the present application. To address the issue of poor appearance resulting from the appearance layer 32 disposed on the first surface 31a of the composite structural member 30, some embodiments of the present application, based on the aforementioned embodiments, further provide a composite structural member 30 comprising a substrate 31, a transition layer 33, and an appearance layer 32. Compared to the aforementioned embodiments, this embodiment includes the addition of the transition layer 33. The material and structure of the substrate 31 are consistent with those described above and are not further described here.

[0107] The substrate 31 includes multiple layers of first fiber cloth 311 and a first resin matrix 312. The multiple layers of first fiber cloth 311 are stacked and embedded in the first resin matrix 312. The substrate 31 includes a first surface 31a. The substrate 31 is in a first preset color. The L value corresponding to the first preset color in the Lab color space is L1.

[0108] The transition layer 33 is laminated on the first surface 31a and includes a second surface 33a facing away from the first surface 31a. The transition layer 33 exhibits a second predetermined color. The second predetermined color corresponds to an L value of L2 in the Lab color space, where L2 is greater than L1. The exterior layer 32 is laminated on the second surface 33a and exhibits a third predetermined color. The third predetermined color corresponds to an L value of L3 in the Lab color space, where L3 is greater than L1.

[0109] The Lab color space is a color model defined by the International Commission on Illumination (CIE) for representing colors. It consists of three channels: the L channel, which represents luminance, or the brightness or darkness of a color. The a channel, which represents the red and green components. Positive values ​​indicate a reddish tint, while negative values ​​indicate a greenish tint. The b channel, which represents the yellow and blue components, represents a yellowish tint, while negative values ​​indicate a bluish tint.

[0110] The following is an expanded discussion of the L value. Figure 8 , Figure 8 A coordinate diagram of color and L values ​​in the Lab color space, used for composite structural members 30 provided in some embodiments of the present application. In the Lab color space, L values ​​(Luminance) can be used to represent the lightness or brightness of a color. L values ​​range from 0 (black) to 100 (white), and the L value determines the depth of the color. Higher L values ​​indicate brighter and lighter colors; lower L values ​​indicate darker and deeper colors.

[0111] Therefore, L2 being greater than L1 means that the second predetermined color is lighter than the first predetermined color, that is, the color of the transition layer 33 is lighter than the color of the substrate 31. For example, when the substrate 31 is black, the transition layer 33 is white; when the substrate 31 is black, the transition layer 33 is gray; when the substrate 31 is gray, the transition layer 33 is white, and so on.

[0112] L3 being greater than L1 means that the third predetermined color is lighter than the first predetermined color, that is, the color of the exterior layer 32 is lighter than the color of the substrate 31. For example, when the substrate 31 is black, the exterior layer 32 is white; when the substrate 31 is black, the exterior layer 32 is gray; when the substrate 31 is gray, the exterior layer 32 is white, and so on.

[0113] In this way, the transition layer 33 can serve as an intermediate layer, effectively covering the dark substrate 31, allowing the light-colored exterior layer 32 to more easily cover the dark substrate 31. The exterior layer 32 presents a uniform color, avoiding the problem of uneven color in the composite material structural member 30. This further improves the aesthetics of the composite material structural member 30, presenting a good visual effect to the user and enhancing the user experience.

[0114] In addition, the transition layer 33 is arranged on the first surface 31a. The surface unevenness problems such as resin enrichment, resin deficiency, black particles, etc. on the first surface 31a can also be covered with the help of the transition layer 33, avoiding the problem that the appearance layer 32 is difficult to adhere to the substrate 31 due to the unevenness of the first surface 31a.

[0115] To improve the smoothness of the composite structural component 30, the second surface 33a of the transition layer 33 is polished before the exterior layer 32 is disposed on the second surface 33a. The hardness of the transition layer 33 is lower than that of the substrate 31. Therefore, compared to polishing the first surface 31a of the substrate 31, polishing the second surface 33a of the transition layer 33 is easier, thereby simplifying the processing of the composite structural component 30, improving the yield rate of the composite structural component 30, and reducing the processing cost of the composite structural component 30.

[0116] The material and structure of the substrate 31 are described in detail below.

[0117] The substrate 31 includes a first fiber cloth 311 and a first resin matrix 312. The material of the first fiber cloth 311 includes at least one of carbon fiber, graphite fiber, carbon nanotube fiber, graphene fiber, alumina fiber, silicon carbide fiber, and silicon nitride fiber. These materials all have a tensile strength greater than 1000 MPa and a flexural strength greater than 1000 MPa, thus providing high structural strength.

[0118] As a result, when the first fiber cloth 311 is the aforementioned type of fiber cloth, the first fiber cloth 311 has high structural strength and hardness, thereby improving the structural strength and hardness of the substrate 31. When the electronic device 100 is dropped or collides, the first housing 12 and the second housing 211 formed by the composite material structural member 30 are subjected to stress impact. The first housing 12 and the second housing 211, relying on their high structural strength and hardness, resist the stress impact and avoid deformation. The first housing 12 and the second housing 211 thus provide good protection for the internal structural parts and electronic components of the electronic device 100, thereby improving the stability of the electronic device 100.

[0119] This application uses carbon fiber as an example to describe the first fiber cloth 311. Carbon fiber is a fiber material with high strength, high modulus, light weight, and corrosion resistance. It is primarily composed of carbon and is made by chemically treating and heating (carbonizing) precursors such as polyacrylonitrile (PAN), petroleum asphalt, or viscose. Carbon fiber typically appears dark black or gray.

[0120] The tensile strength of carbon fiber is greater than or equal to 1000 MPa and less than or equal to 7000 MPa; the flexural strength of carbon fiber is greater than or equal to 1000 MPa and less than or equal to 6000 MPa; the Brinell hardness of carbon fiber is greater than or equal to 50 and less than or equal to 80; the density of carbon fiber is greater than or equal to 1.5 grams per cubic centimeter and less than or equal to 2 grams per cubic centimeter.

[0121] Therefore, carbon fiber has very high structural strength and hardness, is very light, and has a low coefficient of thermal expansion, which provides good thermal stability. As a result, the composite structural member 30 also has high structural strength and hardness. When the electronic device 100 is dropped or colliding, the composite structural member 30 is subjected to stress impact. The composite structural member 30 relies on its high structural strength and hardness to resist the stress impact and avoid deformation. Furthermore, the composite structural member 30 provides good protection for the internal structural members and electronic components of the electronic device 100, thereby improving the stability of the electronic device 100.

[0122] The materials of the first fiber cloth 311, especially carbon fiber, are all darker in color. For example, the color of carbon fiber is black or dark gray, the color of graphite fiber is black, the color of carbon nanotube fiber is black, the color of graphene fiber is black, the color of silicon carbide fiber is black or dark gray, the color of silicon nitride is off-white, and the color of boron nitride is off-white.

[0123] Furthermore, the higher the structural strength of the first fiber cloth 311 , the denser the arrangement of the fibers in the first fiber cloth 311 , resulting in a darker color of the first fiber cloth 311 and thus a darker color of the substrate 31 .

[0124] Therefore, when the material of the first fiber cloth 311 is the above material, the color of the substrate 31 is darker. Figure 7Specifically, L1 is greater than or equal to 0 and less than or equal to 30. The substrate 31 as a whole exhibits an appearance of black, dark gray, or medium gray. For example, when L1 is equal to 0, the substrate 31 appears pure black; when L1 is equal to 10, the substrate 31 appears very dark black, slightly lighter than pure black; when the L value is equal to 20, the substrate 31 appears darker black, lighter than when the L value is 10, but still very dark; when the L value is equal to 30, the substrate 31 appears deep black, lighter than when the L value is 20, but still a very dark tone.

[0125] The color of the first fiber cloth 311 is related to the structural strength and material of the first fiber cloth 311. Therefore, when the L1 value of the first fiber cloth 311 is within the above range, it is set to adapt to the structural strength and material of the first fiber cloth 311, so that the first fiber cloth 311 meets the requirements of structural strength and hardness.

[0126] Please continue reading Figure 8 Furthermore, based on the above embodiment, L2 is greater than or equal to 90 and less than or equal to 100. For example, L2 is 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100. When the L2 value is 100, the color of the transition layer 33 is pure white, and when the L2 value is 90, the color of the transition layer 33 is off-white.

[0127] Thus, when the L2 value is within the above range, the color of the transition layer 33 is relatively light. The appearance layer 32 is disposed on the second surface 33a of the transition layer 33. When the appearance layer 32 is light-colored, the appearance layer 32 can also cover the light-colored transition layer 33. The transition layer 33 is relatively light-colored and cannot be seen through the appearance layer 32. Therefore, the appearance layer 32 can present a good color, thereby improving the aesthetics of the composite material structural component 30.

[0128] Please also refer to Figure 9 and Figure 10 , Figure 9 A coordinate diagram of color and a value in the Lab color space referenced by the composite material structural member 30 provided in some embodiments of the present application; Figure 10 A coordinate diagram of color and b value in the Lab color space referenced by the composite material structural member 30 provided in some embodiments of the present application.

[0129] The a value corresponding to the first preset color in the Lab color space is a1, the b value corresponding to the first preset color in the Lab color space is b1, the a value corresponding to the second preset color in the Lab color space is a2, and the b value corresponding to the second preset color in the Lab color space is b2.

[0130] The corresponding a value in the Lab color space refers to the color's red-green hue. Specifically, the a value is the red-green difference between the color and white. The a value ranges from -128 to +127, with positive values ​​indicating a color leaning toward red, and negative values ​​indicating a color leaning toward green. A larger a value indicates a color leaning toward red, while a smaller a value indicates a color leaning toward green. When the a value is 0, the color is neutral in red-green hue, meaning the color has no discernible red-green bias.

[0131] The corresponding b value in the Lab color space refers to a parameter that describes color, representing the yellow-blue hue of the color. Specifically, the b value is the difference in yellow-blue between the color and white. The b value range is -128 to +127, where positive values ​​indicate a color leaning toward yellow, and negative values ​​indicate a color leaning toward blue. The larger the b value, the closer the color is to yellow; the smaller the b value, the closer the color is to blue. When the b value is 0, it means that the color is neutral in terms of yellow-blue hue, that is, the color has no obvious yellow-blue tendency.

[0132] Based on the above embodiment, a1 is greater than or equal to -30 and less than or equal to 30, and b1 is greater than or equal to -30 and less than or equal to 30. Due to the structural strength and material of the first fiber cloth 311, the first fiber cloth 311 is mostly black and dark gray. The first fiber cloth 311 has no significant deviations in red-green or yellow-blue tones, and is close to a neutral tone. The substrate 31 also appears black and dark gray.

[0133] As a result, when the a1 value and the b1 value of the first fiber cloth 311 are within the above range, they are configured in accordance with the structural strength and material of the first fiber cloth 311 , so that the first fiber cloth 311 meets the requirements of structural strength and hardness.

[0134] a2 is greater than or equal to -30 and less than or equal to 30, and b2 is greater than or equal to -30 and less than or equal to 30. The transition layer 33 exhibits no significant deviation in either red-green or yellow-blue hues, approaching a neutral hue. Thus, when the L2 value is within the aforementioned range, the transition layer 33 exhibits a lighter color. The exterior layer 32 is disposed on the second surface 33a of the transition layer 33. When the exterior layer 32 is light-colored, the exterior layer 32 can also cover the lighter-colored transition layer 33. The transition layer 33 exhibits a lighter color and is not visible through the exterior layer 32. Therefore, the exterior layer 32 exhibits a favorable color, thereby enhancing the aesthetics of the composite structural component 30.

[0135] The structure and materials of the transition layer 33 are described below.

[0136] See also Figure 11 , Figure 11This figure illustrates the structure of a transition layer 33 provided in some embodiments of the present application. The transition layer 33 includes a second resin matrix 331 and a filler 332. The second resin matrix 331 can be a transparent or translucent resin. The filler 332 is distributed within the second resin matrix 331 and is used to change the color of the transition layer 33. The filler 332 exhibits a fourth preset color. The fourth preset color corresponds to an L value of L4 in the Lab color space, where L4 is greater than or equal to L2.

[0137] In this manner, the transition layer 33 is formed from a resin matrix, and the second resin matrix 331 covers the first surface 31a of the substrate 31. Specifically, the second resin matrix 331 can fill the recesses and cover the protrusions of the first surface 31a, thereby preventing the appearance unevenness caused by the direct contact of the exterior layer 32 with the first surface 31a. Furthermore, the second resin matrix 331 is made of resin, and its hardness is lower than that of the substrate 31. This makes it easier to polish than the substrate 31 to obtain a smooth second surface 33a, thereby improving the smoothness of the exterior layer 32 after it is applied to the second surface 33a.

[0138] The transition layer 33 is formed by disposing filler 332 within the second resin matrix 331, resulting in a color consistent with the light color described in the previous embodiment. When the exterior layer 32 is laminated on the second surface 33a, the light-colored transition layer 33 is not visible through the exterior layer 32, thereby improving the color uniformity of the exterior layer 32 and further enhancing the aesthetics of the composite structural component 30.

[0139] In some embodiments, the filler 332 includes at least one of titanium dioxide, white carbon black, calcium carbonate, kaolin, talc, and mica. These types of fillers 332 are all white in color. After these fillers 332 are added to the second resin matrix 331, the transition layer 33 appears white.

[0140] In this way, the addition of filler 332 gives the transition layer 33 a white appearance. Since white is the lightest color, when the light-colored appearance layer 32 is disposed on the transition layer 33, the appearance layer 32 can cover the transition layer 33. The white transition layer 33 does not interfere with the color of the appearance layer 32, making the appearance layer 32 appear uniform in color, thereby improving the aesthetics of the composite material structural component 30.

[0141] Filler 332 is typically non-polar or less polar particles, while second resin matrix 331 may be polar. This polarity difference results in poor dispersion of filler 332 in the resin, thereby affecting the compatibility of filler 332 with second resin matrix 331. To improve the compatibility of filler 332 with second resin matrix 331, filler 332 is surface-modified to enhance compatibility between filler 332 and second resin matrix 331.

[0142] Surface modification of filler 332 is a technique in materials science and chemical engineering used to improve the interfacial interaction between filler 332 and second resin matrix 331. The purpose of surface modification is to introduce specific functional groups onto the surface of filler 332, thereby increasing the hydrophilicity or lipophilicity of filler 332, improving the bonding strength between filler 332 and second resin matrix 331, and improving the dispersibility of filler 332 within second resin matrix 331.

[0143] The surface modification of the filler 332 may include but is not limited to the following methods: first, acid-base modification, by treating the filler 332 with an acid or a base, functional groups may be introduced or removed from the surface of the filler 332 , thereby changing the surface properties of the filler 332 .

[0144] Second, active groups are added by introducing specific functional groups such as hydroxyl, carboxyl, amino, etc. on the surface of the filler 332 through chemical reactions. These functional groups can form chemical bonds with the groups in the resin, thereby improving the bonding force between the filler 332 and the resin.

[0145] As a result, by surface modification of the filler 332, the surface energy of the filler 332 can be adjusted to better match the surface energy of the second resin matrix 331, and it helps to better disperse the filler 332 in the second resin matrix 331, reduce the gap and interfacial tension between the filler 332 and the second resin matrix 331, enhance the interfacial adhesion between the filler 332 and the second resin matrix 331, and improve the compatibility of the filler 332 and the second resin matrix 331.

[0146] In some embodiments, both the first resin matrix 312 and the second resin matrix 331 are thermosetting materials, and the surface of the transition layer 33 facing the substrate 31 is bonded to the substrate 31, thereby connecting the substrate 31 and the transition layer 33 to form a single structural component. This allows the first resin matrix 312 and the second resin matrix 331 to be directly cured into a single structural component, eliminating the need for additional connectors, such as adhesive, between the substrate 31 and the transition layer 33. This reduces the overall thickness of the composite structural component 30.

[0147] Furthermore, the interlayer bonding force between the second resin matrix 331 and the first resin matrix 312 is greater than or equal to 1.5 MPa. Interlayer bonding force refers to the adhesive force between two adjacent layers or a stacked structure, which determines the interaction between the layers and the load transfer capacity.

[0148] In this way, when the interlayer bonding force between the second resin matrix 331 and the first resin matrix 312 is within the above range, the bonding force between the substrate 31 and the transition layer 33 is relatively high, which can enhance the overall strength and rigidity of the composite structural member 30, allowing the composite structural member 30 to maintain its structural integrity when subjected to external loads. In particular, it prevents misalignment between the substrate 31 and the transition layer 33 when the composite structural member 30 is subjected to shear forces. This ensures that the composite structural member 30 remains stable when subjected to stress or environmental changes, avoiding the risk of structural deformation and damage. This improves the durability of the composite structural member 30 and reduces maintenance and repair costs caused by structural damage.

[0149] Moreover, when the interlayer bonding strength between the second resin matrix 331 and the first resin matrix 312 is within the above range, the flatness of the interface between the substrate 31 and the transition layer 33 can be ensured, defects such as unevenness or delamination can be reduced, and the aesthetics of the composite material structural component 30 can be improved.

[0150] Furthermore, when the bonding force between the first resin matrix 312 and the second resin matrix 331 is within the above range, dust, moisture and other fine particles can be prevented from entering between the substrate 31 and the transition layer 33, thereby ensuring the tight bonding between the substrate 31 and the transition layer 33, and avoiding the performance degradation of the composite material structural component 30 due to environmental factors (such as temperature changes, humidity, chemical erosion, etc.) during use.

[0151] In some embodiments, the material of the first resin matrix 312 is the same as that of the second resin matrix 331. This enhances the bonding strength between the first resin matrix 312 and the second resin matrix 331, and consequently, the bonding strength between the substrate 31 and the transition layer 33. This improves the overall structural strength of the composite structural member 30. When the composite structural member 30 is dropped or impacted, stress and load can be better transferred between the substrate 31 and the transition layer 33, allowing the substrate 31 and the transition layer 33 to jointly resist external impacts, thereby enhancing the impact resistance of the composite structural member 30.

[0152] In some embodiments, the first resin matrix 312 is at least one of epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane, and bismaleimide resin. These types of thermosetting resin materials have high strength, low cost, and mature processing technology, which facilitates the processing of the substrate 31 and the transition layer 33, thereby improving the processing efficiency of the composite structural member 30.

[0153] See also Figure 12 , Figure 12 The diagram is a process diagram of the composite material structure 30 provided in some embodiments of the present application. For the embodiment in which the second resin matrix 331 is a thermosetting material, the process of the composite material structure 30 in this embodiment is described in detail.

[0154] A first fiber prepreg 34 is provided. The first fiber prepreg 34 includes multiple layers of first fiber cloth 311 and a first resin matrix 312. The multiple layers of first fiber cloth 311 are embedded in the first resin matrix 312. The first fiber prepreg 34 is in a semi-solid state. The processing of the first fiber prepreg 34 includes:

[0155] The multi-layer first fiber cloth 311 is pretreated to clean the fibers to remove surface oil, dust, and impurities. In some embodiments, the processing method of the first fiber prepreg 34 further includes heat treatment or other surface treatment steps on the multi-layer first fiber cloth 311 to improve the adhesion between the fibers and the resin.

[0156] The first resin matrix 312 and curing agent are mixed in a specific ratio and heated to a desired temperature to enhance the resin's fluidity. The pretreated multi-layered first fiber cloth 311 is then immersed in the first resin matrix 312, ensuring that the multi-layered first fiber cloth 311 fully absorbs the resin. The fiber impregnation process can be accomplished using equipment such as a roller, sprayer, or dipping tank. This process yields a semi-solid first fiber prepreg 34.

[0157] The processing of the transition layer 33 includes adding a filler 332 to the second resin matrix 331, and chemically reacting the second resin matrix 331 with the filler 332 to improve the compatibility between the second resin matrix 331 and the filler 332. When the second resin matrix 331 and the filler 332 reach a certain degree of crosslinking, the viscosity of the second resin matrix 331 and the filler 332 increases, while the fluidity decreases, and the second resin matrix 331 and the filler 332 transform into a semi-solid state, thereby forming the transition layer blank 35.

[0158] A semi-solid transition layer blank 35 is laminated onto the surface of the first fiber prepreg 34 to form a first blank 38. The first blank 38 is placed in a mold and laid out into the desired shape. Pressure and temperature are then applied to cure the first fiber prepreg 34 and transition layer blank 35 to form a blank for the composite structural component 30. The curing process can be thermal curing or light curing, depending on the type of resin used.

[0159] After curing is completed, the composite material structural component blank is removed from the mold. According to the design requirements, the composite material structural component blank is cut and formed to obtain the composite material structural component 30. The cutting and forming of the composite material structural component blank can be performed using methods such as laser cutting, mechanical cutting, or thermal cutting.

[0160] Through the above-described processing method, the substrate 31 and the transition layer 33 are cured and formed in the same process. No additional connector is required to connect the substrate 31 and the transition layer 33, which facilitates the thinning of the composite structural member 30. Furthermore, the processing of the composite structural member 30 is simplified, which improves the processing efficiency of the composite structural member 30. Curing and forming the substrate 31 and the transition layer 33 in the same process ensures a better bond between the two, forming a single structure and improving the structural integrity and strength of the composite structural member 30.

[0161] The exterior layer 32 is provided on the second surface 33 a of the transition layer 33 .

[0162] See also Figure 13 , Figure 13 Schematic diagram of the structure of a composite structural member 30 provided in some embodiments of the present application. In other embodiments, the second resin matrix 331 is a thermoplastic material. In this way, the second resin matrix 331 and the filler 332 can be separately molded and then connected to the substrate 31. In other words, after the transition layer 33 is separately processed into a shape compatible with the substrate 31, the transition layer 33 is connected to the first surface 31a of the substrate 31 via the adhesive portion 36.

[0163] This allows for a wider range of material options for the second resin matrix 331 and a wider range of processing techniques for the transition layer 33. The composite structural member 30 can select a transition layer 33 material that is compatible with the material of the substrate 31. An adhesive portion 36 is provided between the transition layer 33 and the substrate 31 to enhance the bonding strength between the substrate 31 and the transition layer 33, thereby improving the overall structural stability of the composite structural member 30.

[0164] Furthermore, the second resin matrix 331 includes at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene oxide, polysulfone, polyetherimide, polyethersulfone, polyphenylene sulfone resin, and polyphthalamide. These types of thermoplastic resin materials have high strength, low cost, and mature processing technology, which facilitates the formation of the transition layer 33 and improves the processing efficiency of the composite structural member 30.

[0165] See also Figure 14 , Figure 14 The following are diagrams of the processing of the composite material structural member 30 according to some other embodiments of the present application. For the embodiment in which the second resin matrix 331 is a thermoplastic material, the processing of the composite material structural member 30 in this embodiment is described in detail.

[0166] A first fiber prepreg 34 is provided. The first fiber prepreg 34 comprises multiple layers of first fiber cloth 311 and a first resin matrix 312. The multiple layers of first fiber cloth 311 are embedded in the first resin matrix 312. The first fiber prepreg 34 is in a semi-solid state. It is worth noting that this embodiment differs from the aforementioned processing process in which the second resin matrix 331 is a thermosetting material in that the first fiber prepreg 34 is cured and formed separately after preparation to obtain the substrate 31.

[0167] A second resin matrix 331 and a filler 332 are provided, and the second resin matrix 331 and the filler 332 are fixed and formed to obtain a transition layer 33 .

[0168] An adhesive portion 36 is provided on the first surface 31 a of the substrate 31 , and the transition layer 33 is connected to the substrate 31 via the adhesive portion 36 .

[0169] In the above processing method, the substrate 31 and the transition layer 33 are connected by means of the adhesive portion 36 after being formed separately. The transition layer 33 is formed separately, which can improve the surface flatness of the transition layer 33 and facilitate the arrangement of the appearance layer 32 on the second surface 33a of the transition layer 33.

[0170] In some other embodiments, the transition layer 33 includes multiple layers of second fiber cloth 371 and a second resin matrix 331, wherein the multiple layers of second fiber cloth 371 are stacked and embedded in the second resin matrix 331. Thus, the transition layer 33 is a light-colored fiberboard, and the material of the transition layer 33 is similar to that of the substrate 31, which facilitates the bonding between the substrate 31 and the transition layer 33, thereby improving the overall structural strength of the composite material structural component 30, allowing the composite material structural component 30 to withstand greater stress and load, and enhancing the impact resistance of the composite material structural component 30.

[0171] Furthermore, the second fiber cloth 371 is made of at least one of glass, ceramic, aramid, and polyethylene. Glass, ceramic, aramid, and polyethylene fibers are nearly white in color, and the transition layer 33 formed from the second fiber cloth 371 also appears white. This prevents the color of the transition layer 33 from being visible through the exterior layer 32, resulting in a uniform color for the exterior layer 32, enhancing the aesthetics of the composite structural component 30.

[0172] See also Figure 15 , Figure 15 This is a diagram illustrating the processing of a composite structural member 30 provided in some further embodiments of the present application. The processing method for a transition layer 33 comprising multiple layers of second fiber cloth 371 and a second resin matrix 331 may refer to the processing method for a transition layer 33 comprising a thermosetting material as described above. Specifically, the processing method includes:

[0173] A first fiber prepreg 34 is provided. The first fiber prepreg 34 includes multiple layers of first fiber cloth 311 and a first resin matrix 312. The multiple layers of first fiber cloth 311 are embedded in the first resin matrix 312. The first fiber prepreg 34 is in a semi-solid state.

[0174] A second fiber prepreg 37 is provided. The second fiber prepreg 37 includes multiple layers of second fiber cloth 371 and a second resin matrix 331. The multiple layers of second fiber cloth 371 are embedded in the second resin matrix 331. The second fiber prepreg 37 is in a semi-solid state.

[0175] A semi-solid second fiber prepreg 37 is layered on the surface of the first fiber prepreg 34 to form a first blank. The first blank is placed in a mold and laid out into the desired shape. Pressure and temperature are then applied to cure the first and second fiber prepregs 34, 37 to form a composite structural blank. The curing process can be thermal or light-curing, depending on the type of resin used.

[0176] After curing is complete, the composite structural component blank is removed from the mold. According to the design requirements, the composite structural component blank is cut and formed to obtain a composite structural component 30. The base plate 31 of the composite structural component 30 is formed by curing the first fiber prepreg 34, and the transition layer 33 is formed by curing the second fiber prepreg 37.

[0177] Through the above-described processing method, the substrate 31 and the transition layer 33 are cured and formed in the same process. No additional connector is required to connect the substrate 31 and the transition layer 33, which facilitates the thinning of the composite structural member 30. Furthermore, the processing of the composite structural member 30 is simplified, which improves the processing efficiency of the composite structural member 30. Curing and forming the substrate 31 and the transition layer 33 in the same process ensures a better bond between the two, forming a single structure and improving the structural integrity and strength of the composite structural member 30.

[0178] On the basis of any of the above processing methods, after the substrate 31 and the transition layer 33 are connected, the processing method of the composite material structural component 30 further includes the following steps.

[0179] The second surface 33a of the transition layer 33 is polished to a roughness greater than or equal to 0.2 microns and less than or equal to 10 microns. This provides a smooth surface for the subsequent installation of the exterior layer 32, thereby improving the aesthetics of the exterior layer 32 and the smoothness of the exterior layer 32 after it is installed on the transition layer 33 of the composite structural component 30.

[0180] In any of the above embodiments, the thickness of the transition layer 33 is greater than or equal to 80 microns and less than or equal to 120 microns. When the thickness of the transition layer 33 is within this range, the transition layer 33 can effectively cover the unevenness on the substrate 31 and has a minimal effect on the thickness of the composite material structural member 30, thereby ensuring the lightness and thinness of the composite material structural member 30.

[0181] See also Figure 16 , Figure 16 Schematic diagram of the structure of a composite structural member 30 provided in some further embodiments of the present application. An exterior layer 32 is applied to the second surface 33a. The exterior layer 32 includes a primer 321, a midcoat 322, and a topcoat 323. The primer 321 is applied to the second surface 33a, the midcoat 322 is applied to the surface of the primer 321 facing away from the second surface 33a, and the topcoat 323 is applied to the surface of the midcoat 322 facing away from the primer 321. The primer 321 and the topcoat 323 are transparent materials, and the midcoat 322 presents the color of the composite structural member 30.

[0182] The arrangement direction of the substrate 31 and the transition layer 33 is a first direction, the thickness of the primer 321 in the first direction is greater than or equal to 5 microns and less than or equal to 10 microns, the thickness of the mid-coat 322 in the first direction is greater than or equal to 30 microns, and the thickness of the topcoat 323 in the first direction is greater than or equal to 15 microns and less than or equal to 30 microns.

[0183] The primer 321 is used to enhance the adhesion between the transition layer 33, the midcoat 322, and the topcoat 323. It fills minor imperfections on the second surface 33a, improves its smoothness, and provides a good adhesion foundation for subsequent paint layers. The midcoat 322 enhances the primer 321's wear resistance, chemical resistance, and heat resistance, fills imperfections in the midcoat, and provides a better appearance. The topcoat 323 enhances the midcoat 322's weather resistance, stain resistance, and scratch resistance, providing a superior appearance and protection.

[0184] By setting the primer 321, the midcoat 322 and the topcoat 323, the appearance layer 32 can form a multi-layer coating system, and the composite material structure 30 has comprehensive, long-lasting and beautiful protection. After the appearance layer 32 is sprayed, it is cured.

[0185] Finally, the exterior layer 32 is polished and finely trimmed, and the cured exterior layer 32 is polished to further improve the surface flatness and smoothness of the composite material structural component 30 .

[0186] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite material structural part, characterized in that: include: A substrate comprising multiple layers of first fiber cloth and a first resin matrix, wherein the multiple layers of the first fiber cloth are stacked and embedded in the first resin matrix, the substrate comprising a first surface, the substrate being a first preset color, and the first preset color corresponding to an L value of L1 in a Lab color space; a transition layer laminated on the first surface, the transition layer including a second surface facing away from the first surface, the transition layer being a second preset color, the second preset color corresponding to an L value of L2 in the Lab color space, wherein L2 is greater than L1; the transition layer including multiple layers of second fiber cloth and a second resin matrix, the multiple layers of the second fiber cloth being laminated, and the multiple layers of the second fiber cloth being embedded in the second resin matrix; an appearance layer laminated on the second surface, the appearance layer being a third preset color, the third preset color corresponding to an L value of L3 in the Lab color space, and the L3 being greater than the L1; The hardness of the substrate is greater than the hardness of the transition layer.

2. The composite material structural member according to claim 1, characterized in that: The material of the first fiber cloth includes at least one of carbon fiber, glass fiber, graphite fiber, carbon nanotube fiber, graphene fiber, alumina fiber, silicon carbide fiber, silicon nitride fiber and boron nitride fiber.

3. The composite material structural member according to claim 1 or 2, characterized in that: The transition layer further includes a filler, which is distributed in the second resin matrix and has a fourth preset color. The fourth preset color corresponds to an L value of L4 in the Lab color space, and L4 is greater than or equal to L2.

4. The composite material structural member according to claim 3, characterized in that: The first resin matrix and the second resin matrix are both thermosetting materials, and the surface of the transition layer facing the substrate is adhered to the substrate to be connected to the substrate to form an integrated structural component.

5. The composite material structural member according to claim 3 or 4, characterized in that: The interlayer bonding force between the second resin matrix and the first resin matrix is ​​greater than or equal to 1.5 MPa.

6. The composite material structural member according to claim 4 or 5, characterized in that: The material of the first resin matrix is ​​the same as the material of the second resin matrix; and / or, The first resin matrix is ​​at least one of epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane and bismaleimide resin.

7. The composite material structural member according to claim 3, characterized in that: The second resin matrix is ​​a thermoplastic material, and the composite material structural component further includes a bonding portion, through which the transition layer is bonded to the substrate.

8. The composite material structural member according to claim 7, characterized in that: The second resin matrix includes at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, polyetherimide, and polyethersulfone.

9. The composite material structural member according to claim 8, characterized in that: The polysulfone is polyphenylene sulfone resin, and the polyamide is polyphthalamide.

10. The composite material structural member according to any one of claims 3 to 9, characterized in that: The filler includes at least one of titanium dioxide, white carbon black, calcium carbonate, kaolin, talc, and mica.

11. The composite material structural member according to any one of claims 3 to 10, characterized in that: The filler is a surface-modified filler to increase the compatibility between the filler and the second resin matrix.

12. The composite material structural member according to claim 1 or 2, characterized in that: The material of the second fiber cloth includes at least one of glass, ceramic, aramid, and polyethylene.

13. The composite material structural member according to claim 12, characterized in that: The material of the first fiber cloth is different from the material of the second fiber cloth.

14. The composite material structural member according to any one of claims 1 to 13, characterized in that: The roughness of the second surface is greater than or equal to 0.2 micrometers and less than or equal to 10 micrometers.

15. The composite material structural member according to any one of claims 1 to 14, characterized in that: The L1 is greater than or equal to 0 and less than or equal to 30.

16. The composite material structural member according to any one of claims 1 to 15, characterized in that: The L2 is greater than or equal to 90 and less than or equal to 100.

17. The composite material structural member according to any one of claims 1 to 16, characterized in that: The a value corresponding to the first preset color in the Lab color space is a1, the b value corresponding to the first preset color in the Lab color space is b1, a1 is greater than or equal to -30 and less than or equal to 30, and b1 is greater than or equal to -30 and less than or equal to 30.

18. The composite material structural member according to any one of claims 1 to 17, characterized in that: The a value corresponding to the second preset color in the Lab color space is a2, and the b value corresponding to the second preset color in the Lab color space is b2. The a2 is greater than or equal to -30 and less than or equal to 30, and the b2 is greater than or equal to -30 and less than or equal to 30.

19. A housing of an electronic device, characterized in that: At least a portion of the shell is a composite material structural member according to any one of claims 1 to 18.

20. An electronic device, characterized in that: include: The housing is the housing according to claim 19, wherein the housing comprises a first housing and a second housing; Display, the first housing is a housing of the display; Host, the second shell is the shell of the host.

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