Frame body surface treatment method, frame body and electronic equipment

Abstract

The invention discloses a surface treatment method of a frame body, the frame body and electronic equipment. According to the surface treatment method of the frame body, the frame body is a plastic frame body, and the surface treatment method comprises the steps that a primer layer, an electroplated layer and a colored paint layer are sequentially formed on the surface of the frame body; spraying a first coating on the colored paint layer to form a first finish paint layer; the wiredrawing texture is formed on the surface, deviating from the colored paint layer, of the first finish paint layer, the problem that the wiredrawing texture is not obvious due to the fact that the wiredrawing texture is covered with a thick coating is solved, the wiredrawing texture is closer to the external environment, the wiredrawing texture is clear, and expressive force of the wiredrawing texture is enhanced; therefore, the frame body has good appearance expressive force.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a surface treatment method of a frame, a frame, and an electronic device. Background Art

[0002] With the development of smart devices, the material and appearance of the device frame have become important factors in improving product competitiveness. For example, the brushed middle frame of the device has a good texture and helps to improve the user experience.

[0003] In the related art, although a brushed texture can be formed on the surface of the device middle frame, the expressiveness of the brushed texture still needs to be improved. Summary of the invention

[0004] The embodiments of the present application provide a surface treatment method for a frame, a frame, and an electronic device, which can solve the problem of poor expression of brushed texture of plastic frames in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a surface treatment method for a frame, the method comprising:

[0006] A primer layer, an electroplating layer and a color paint layer are sequentially formed on the surface of the frame;

[0007] Spraying a first coating on the color paint layer to form a first topcoat layer;

[0008] A brushed texture is formed on the surface of the first topcoat layer facing away from the color paint layer.

[0009] In a second aspect, an embodiment of the present application provides a frame body, which is obtained by processing the surface treatment method of the embodiment of the first aspect mentioned above.

[0010] In a third aspect, an embodiment of the present application provides an electronic device, comprising a frame according to an embodiment of the second aspect.

[0011] In this way, in the surface treatment method of the frame provided in the embodiment of the present application, a primer layer, an electroplating layer and a color paint layer are sequentially formed on the surface of the frame, and a first coating is sprayed on the color paint layer to form a first topcoat layer. The first topcoat layer can not only improve the appearance quality of the frame, but also enhance the overall wear resistance and scratch resistance of the frame. A brushed texture is formed on the surface of the first topcoat layer away from the color paint layer to enhance the expressiveness of the brushed texture.

[0012] Therefore, in the embodiment of the present application, a brushed texture is formed on the surface of the first top paint layer away from the color paint layer, thereby improving the problem that the brushed texture is covered by a thicker coating, resulting in the brushed texture being unclear. The brushed texture is closer to the external environment, the brushed texture is clear, and the expressiveness of the brushed texture is enhanced, so that the frame has good appearance expressiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 It is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention;

[0015] Figure 2 is a partial cross-sectional view of a frame body according to an embodiment of the present invention;

[0016] Figure 3 It is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention;

[0017] Figure 4 is a schematic flow chart of a surface treatment method of a frame according to another embodiment of the present invention;

[0018] Figure 5 is a partial cross-sectional view of a frame body according to an embodiment of the present invention;

[0019] Figure 6 is a schematic flow chart of a surface treatment method of a frame according to another embodiment of the present invention;

[0020] Figure 7 It is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention;

[0021] Figure 8 The figure is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1. Frame; 2. Primer layer; 3. Electroplating layer; 4. Color paint layer; 5. First topcoat layer; 6. Second topcoat layer; 7. Electroplating primer layer. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0025] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0026] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "middle", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] See also Figure 1 and Figure 2 , Figure 1 It is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention; Figure 2 It is a partial cross-sectional view of a frame body according to an embodiment of the present invention.

[0029] First, as Figure 1 and Figure 2 As shown, an embodiment of the present application provides a surface treatment method for a frame, the method comprising:

[0030] Step S1: forming a primer layer 2, an electroplating layer 3 and a color paint layer 4 on the surface of a frame 1 in sequence;

[0031] Step S2: spraying a first coating on the color paint layer 4 to form a first topcoat layer 5;

[0032] Step S3: forming a brushed texture on the surface of the first topcoat layer 5 facing away from the color paint layer 4.

[0033] In the surface treatment method of the frame 1 provided in the embodiment of the present application, a primer layer 2, an electroplating layer 3 and a color paint layer 4 are sequentially formed on the surface of the frame 1, and a first coating is sprayed on the color paint layer 4 to form a first topcoat layer 5. The first topcoat layer 5 can not only improve the appearance quality of the frame 1, but also enhance the overall wear resistance and scratch resistance of the frame 1. A brushed texture is formed on the surface of the first topcoat layer 5 away from the color paint layer 4 to enhance the expressiveness of the brushed texture. By forming a brushed texture on the surface of the first topcoat layer 5 away from the color paint layer 4, the problem that the brushed texture is covered by a thicker coating and the brushed texture is not obvious is improved. The brushed texture is closer to the external environment, the brushed texture is clear, and the expressiveness of the brushed texture is enhanced, so that the frame 1 has good appearance expressiveness.

[0034] In the embodiment of the present application, the frame 1 may be a middle frame of an electronic device such as a mobile phone, a tablet computer, etc. The frame 1 may be used as a structural main body of the electronic device to support various functional components such as a screen, a back cover, and a circuit board of the electronic device.

[0035] Specifically, the frame 1 may be a plastic frame, which is made of a plastic material, and the plastic material may include at least one of a thermoplastic plastic material and a thermosetting plastic material. The specific type of the plastic material may not be limited in the embodiment of the present application. Compared with metal materials, plastic materials have lower weight and better processing performance. Therefore, the frame 1 made of plastic material is more conducive to reducing the weight of the electronic device.

[0036] In step S1, after the plastic frame is made by the injection molding process, a primer layer 2, an electroplating layer 3 and a color paint layer 4 can be sequentially formed on the surface of the frame 1. Among them, the primer layer 2 can be used to cover the injection molding problem of the frame 1 itself and improve the flatness of the surface of the frame 1. The electroplating layer 3 can be used to improve the surface brightness of the frame 1 and enhance the metallic texture of the frame 1. The color paint layer 4 can be a colored paint film formed on the surface of the frame 1, presenting the appearance color effect of the frame 1. For example, the color paint layer 4 can be black, white or blue, etc. The specific color of the color paint layer 4 in the embodiment of the present application is not limited.

[0037] In step S2 , after the color paint layer 4 is formed on the frame 1 , a first coating material may be sprayed on a surface of the color paint layer 4 facing away from the frame 1 by a spraying process to form a first topcoat layer 5 .

[0038] The first coating is a light-curing coating. After the first coating is sprayed to form a first topcoat layer 5, the first topcoat layer 5 can be cured by a light-curing lamp.

[0039] Optionally, the first topcoat layer 5 can be the last layer sprayed on the surface of the frame 1. The overall effect of the frame 1 is reflected by the first topcoat layer 5, so the first topcoat is required to have good chroma and brightness.

[0040] In step S3, after the first topcoat layer 5 is cured, a brushing treatment is performed on the surface of the first topcoat layer 5 facing away from the color paint layer 4 to form a brushed pattern, so that the device frame 1 has a texture. The specific shape and size of the brushed pattern can be flexibly designed.

[0041] Compared to the scheme in the related art of first forming a brushed texture on the surface of the middle frame and then forming a primer layer, an electroplating layer, a color paint layer and a topcoat layer on the surface of the middle frame, in the embodiment of the present application, a primer layer 2, an electroplating layer 3, a color paint layer 4 and a first topcoat layer 5 are first formed on the surface of the middle frame, and then a brushed texture is formed in the first topcoat layer 5, so as to improve the problem that the brushed texture is not obvious due to the excessively thick coating covering the brushed texture.

[0042] See also Figure 3 , Figure 3 The figure is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention.

[0043] In some embodiments, Figure 2 and Figure 3 As shown, step S2 includes:

[0044] Step S21: Mixing polyurethane acrylic resin and photoinitiator to obtain a first coating.

[0045] The first coating material mixed with polyurethane acrylic resin is used to make the first topcoat layer 5 have good color retention, weather resistance and waterproof performance. The polyurethane acrylic resin includes monofunctional polyurethane acrylic resin, difunctional polyurethane acrylic resin and multifunctional polyurethane acrylic resin.

[0046] Exemplarily, the first coating includes polyurethane acrylic resin, silicone resin, dispersant, matting powder, photoinitiator TPO, photoinitiator 184, leveling agent, methyl isobutyl ketone, butyl acetate and diacetone alcohol.

[0047] Step S22: spraying the first coating material on the color paint layer 4 to obtain a first intermediate layer.

[0048] The first coating is sprayed onto the surface of the color paint layer 4 by a spraying process to form a first intermediate layer.

[0049] Step S23: using a light curing lamp to bake the first intermediate layer at a first preset temperature to obtain a first topcoat layer 5 .

[0050] In actual applications, after the first coating is sprayed on the surface of the color paint layer 4 to form a first intermediate layer, the first intermediate layer is only attached to the surface of the color paint layer 4. Therefore, a light curing lamp is required to bake the first intermediate layer at a first preset temperature to cure the first intermediate layer. The first topcoat layer 5 is the cured first intermediate layer.

[0051] Optionally, the first preset temperature may be 55°C-65°C. That is, the curing light's baking temperature is 55°C-65°C, and the curing light is baked for 7min-10min and then subjected to 650mj / cm 2 -750mj / cm 2 The energy is further cured, so that the light curing lamp has a higher curing efficiency for the first intermediate layer, and at the same time, a better curing effect can be taken into account.

[0052] For example, the first intermediate layer is baked at 60°C for 10 minutes and then heated at 700 mj / cm 2 The energy is further cured to form a first topcoat layer 5 on the surface of the color paint layer 4.

[0053] In some embodiments, the polyurethane acrylic resin includes 3% to 7% of a multifunctional polyurethane acrylic resin.

[0054] In these embodiments, the polyurethane acrylic resin includes 3%-7% of multifunctional polyurethane acrylic resin by weight to reduce the surface hardness of the first topcoat layer 5, improve the appearance refinement of the brushed texture, and increase the service life of the brushing tool.

[0055] Monofunctional polyurethane acrylic resin refers to a polyurethane acrylic resin molecule with one reactive functional group, and multifunctional polyurethane acrylic resin refers to a polyurethane acrylic resin molecule with multiple reactive functional groups. The more reactive functional groups there are, the more complete the reaction between the resin molecules, the higher the cross-linking density of the resin, and the harder the resin.

[0056] Compared with the topcoat layer of the prior art, the first topcoat layer 5 in the embodiment of the present application reduces the content of the multifunctional polyurethane acrylic resin in the polyurethane acrylic resin to reduce the hardness of the resin, that is, reduces the hardness of the first topcoat layer 5, so as to reduce the difficulty of forming a brushed texture on the surface of the first topcoat layer 5.

[0057] In the related art, the pencil hardness of the topcoat layer is 1H-3H, while in the embodiment of the present application, the pencil hardness of the first topcoat layer 5 is F-1H, so that the first topcoat layer 5 has a lower hardness to facilitate the drawing tool to form a drawing texture on the first topcoat layer 5.

[0058] In some embodiments, Figure 2The thickness L1 of the first topcoat layer 5 shown meets the condition of 25um≤L1≤35um.

[0059] In these embodiments, when the thickness L1 of the first topcoat layer 5 satisfies the above range, it can avoid the problem of the first topcoat layer 5 being torn during the brushing process due to the first topcoat layer 5 being too thin, and can also improve the problem of the brushed texture appearance being destroyed and the refinement of the brushed texture being reduced due to the first topcoat layer 5 being too thick.

[0060] Exemplarily, the thickness L1 of the first topcoat layer 5 may be 25 um, 30 um, 32 um or 35 um, etc.

[0061] See also Figure 4 and Figure 5 , Figure 4 is a schematic flow chart of a surface treatment method of a frame according to another embodiment of the present invention; Figure 5 It is a partial cross-sectional view of a frame body according to an embodiment of the present invention.

[0062] In some embodiments, Figure 4 and Figure 5 As shown, after step S3,

[0063] Step S4: spraying a second coating material on the first topcoat layer 5 to form a second topcoat layer 6 .

[0064] In these embodiments, after a brushed texture is formed on the first topcoat layer 5, a second coating is sprayed on the first topcoat layer 5 to form a second topcoat layer 6. The second topcoat layer 6 provides the frame 1 with better wear resistance and corrosion resistance, and can improve the problem that the brushed texture on the first topcoat layer 5 is easily worn.

[0065] Optionally, the second coating is a transparent photocurable coating. After spraying the second coating to form a second topcoat layer 6, the second topcoat layer 6 can be cured by a photocuring lamp. The transparent second topcoat layer 6 will not cover the brushed texture on the first topcoat layer 5, so that the brushed texture of the frame 1 has better expressiveness.

[0066] See also Figure 6 , Figure 6 It is a schematic flow chart of a surface treatment method of a frame according to another embodiment of the present invention.

[0067] In some embodiments, Figure 5 and Figure 6 As shown, step S4 includes:

[0068] Step S41: Mixing polyurethane acrylic resin, silicone resin and photoinitiator to obtain a second coating.

[0069] The second coating material is mixed with polyurethane acrylic resin so that the second topcoat layer 6 has good color retention, weather resistance and waterproof performance. Polyurethane acrylic resin includes monofunctional polyurethane acrylic resin, difunctional polyurethane acrylic resin and multifunctional polyurethane acrylic resin.

[0070] Exemplarily, the second coating includes polyurethane acrylic resin, silicone resin, dispersant, matting powder, photoinitiator TPO, photoinitiator 184, leveling agent, methyl isobutyl ketone, butyl acetate and diacetone alcohol.

[0071] For example, the CAS number of the silicone resin is 67763-03-5.

[0072] Step S42: spraying the second coating on the first topcoat layer 5 to obtain a second intermediate layer.

[0073] The second coating is sprayed on the surface of the first topcoat layer 5 by a spraying process to form a second intermediate layer.

[0074] Step S43: using a light curing lamp to bake the second intermediate layer at a second preset temperature to obtain a second topcoat layer 6 .

[0075] In actual applications, after the second coating is sprayed on the surface of the first topcoat layer 5 to form a second intermediate layer, the second intermediate layer is only attached to the surface of the first topcoat layer 5. Therefore, a light curing lamp is required to bake the second intermediate layer at a second preset temperature to cure the second intermediate layer. The second topcoat layer 6 is the cured second intermediate layer.

[0076] Optionally, the second preset temperature may be 55°C-65°C. The curing light has a curing temperature of 55°C-65°C. The curing light is used for curing for 7-10 minutes and then 900 mj / cm 2 ~1100mj / cm 2 The energy is further cured, so that the light curing lamp has a higher curing efficiency for the second intermediate layer and can also achieve a better curing effect.

[0077] For example, the second intermediate layer is baked at 60°C for 10 minutes and then heated to 1000 mj / cm 2 energy to further cure, forming a cured second topcoat layer 6 on the surface of the first topcoat layer 5.

[0078] In some embodiments, Figure 5 As shown, the polyurethane acrylic resin includes 15%-25% of a multifunctional polyurethane acrylic resin.

[0079] In these embodiments, the polyurethane acrylic resin includes 15%-25% of multifunctional polyurethane acrylic resin by weight to enhance the surface hardness of the second topcoat layer 6 and improve the wear resistance of the second topcoat layer 6 .

[0080] Compared with the topcoat layer of the prior art and the first topcoat layer 5 in the embodiment of the present application, the second topcoat layer 6 in the embodiment of the present application increases the content of the multifunctional polyurethane acrylic resin in the polyurethane acrylic resin to increase the hardness of the resin, that is, to enhance the hardness of the second topcoat layer 6, so that the second topcoat layer 6 has higher wear resistance.

[0081] In the embodiment of the present application, the pencil hardness of the second topcoat layer 6 is 1H-3H, so that the second topcoat layer 6 has a higher hardness.

[0082] In some embodiments, Figure 5 As shown, the content of the silicone resin in the second coating is 25%-35%.

[0083] In these embodiments, the content of the silicone resin in the second coating is 25%-35% by weight, so as to enhance the toughness of the second topcoat layer 6 and reduce the risk of the second topcoat layer 6 being bent and broken.

[0084] Optionally, by weight percentage, the content of the polyurethane acrylic resin in the second coating is 22%-28%, the content of the photoinitiator in the second coating is 4%-5%, and the content of the silicone resin in the second coating is 25%-35%.

[0085] In some embodiments, Figure 5 As shown, the thickness L2 of the second topcoat layer 6 satisfies, L2≤10um.

[0086] In these embodiments, when the thickness L2 of the second topcoat layer 6 meets the above conditions, the thickness of the second topcoat layer 6 is reduced to reduce the coverage of the brushed texture on the first topcoat layer 5 by the second topcoat layer 6, thereby enhancing the expressiveness of the brushed texture of the frame 1.

[0087] Exemplarily, the thickness L2 of the second topcoat layer 6 may be 1 um, 5 um, 7 um or 10 um, etc.

[0088] By adjusting the components of the second coating, the second topcoat layer 6 has a higher hardness at a thinner thickness, thereby improving the wear resistance of the second topcoat layer 6 and improving the shielding problem of the second topcoat layer 6 on the brushed texture.

[0089] In some embodiments, 7 parts of monofunctional polyurethane acrylic resin, 18 parts of bifunctional polyurethane acrylic resin, 10.5 parts of multifunctional polyurethane acrylic resin, 20 parts of silicone resin, 1.5 parts of dispersant, 8 parts of matting powder, 0.5 parts of photoinitiator TPO, 4 parts of photoinitiator 184, 0.5 parts of leveling agent, 10 parts of methyl isobutyl ketone, 10 parts of butyl acetate and 10 parts of diacetone alcohol are mixed to form a first coating, the first coating is sprayed on the color paint layer 4, and the light curing lamp is baked at 60°C for 10 minutes, and then subjected to 700mj / cm 2 The energy is further cured to form a 30um first topcoat layer 5 on the surface of the middle frame;

[0090] Then, a 15N pressure and a 300-mesh drawing gauze are used to draw the first topcoat layer 5 for 75 seconds to form a drawing texture;

[0091] 5 parts of monofunctional polyurethane acrylic resin, 11 parts of bifunctional polyurethane acrylic resin, 9.5 parts of multifunctional polyurethane acrylic resin, 30 parts of silicone resin, 1.5 parts of dispersant, 8 parts of matting powder, 0.5 parts of photoinitiator TPO, 4 parts of photoinitiator 184, 0.5 parts of leveling agent, 10 parts of methyl isobutyl ketone, 10 parts of butyl acetate and 10 parts of diacetone alcohol were mixed to form a second coating, which was sprayed on the color paint layer 4 and baked at 60°C for 10 minutes with a light curing lamp, and then subjected to 1000 mj / cm 2 The energy is further cured to form a 5um second topcoat layer 6 on the surface of the first topcoat layer 5.

[0092] See also Figure 7 , Figure 7 The figure is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention.

[0093] In some embodiments, Figure 5 and Figure 7 As shown, step S3 includes:

[0094] Step S31: placing the frame 1 on a wire drawing jig.

[0095] After the first topcoat layer 5 is cured, the frame 1 is placed on a wire drawing jig to fix the wire drawing jig, facilitating subsequent wire drawing operations.

[0096] Step S32: using a wire drawing tool to move relative to the frame 1 under a first preset pressure F to form a wire drawing texture on the first topcoat layer 5 .

[0097] After the frame 1 is fixed to the wire drawing jig, the wire drawing tool and the first topcoat layer 5 move relatively to allow the wire drawing tool to form a wire drawing texture on the side of the first topcoat layer 5 facing away from the frame 1 .

[0098] Exemplarily, the wire drawing tool can be a wire drawing gauze or a wire drawing sand disk, and the mesh number of the wire drawing gauze can be designed by oneself. Exemplarily, the mesh number of the wire drawing gauze is between 200 mesh and 500 mesh.

[0099] In some embodiments, the first preset pressure F satisfies 10N≤F≤18N.

[0100] In these embodiments, when the first preset pressure F meets the above conditions, a clear brushed texture is formed on the first topcoat layer 5 without scratching the first topcoat layer 5 .

[0101] The first preset force is the drawing pressure exerted by the drawing tool on the first topcoat layer 5 .

[0102] Exemplarily, the first preset force is 10N or 14N or 18N, etc.

[0103] Optionally, the wire drawing tool moves relative to the frame 1 within a first preset time, and the first preset time is 70s-90s.

[0104] See also Figure 8 , Figure 8 The figure is a schematic flow chart of a surface treatment method of a frame according to an embodiment of the present invention.

[0105] In some embodiments, Figure 5 and Figure 8 As shown, step S1 includes:

[0106] Step S11: spraying a treatment agent on the surface of the frame 1 to form a primer layer 2 .

[0107] In an embodiment of the present application, a treatment agent can be first sprayed on the surface of the frame 1 to treat the surface of the frame 1, cover the injection molding problems of the frame 1 itself, and improve the bonding strength between the subsequent coating and the frame 1. In this way, the adhesion stability of the subsequent coating on the frame 1 can be improved.

[0108] The main components of the treating agent are 45%-55% by weight of polycarbonate resin and 40%-60% by weight of bifunctional polyurethane resin.

[0109] Step S12: spraying electroplating primer on the primer layer 2 to form an electroplating primer layer 7.

[0110] Electroplating primer is sprayed on the primer layer 2, and the electroplating primer layer can be a light-curing electroplating primer to form an electroplating primer layer 7. In practical applications, the electroplating primer layer 7 can not only improve the surface flatness of the primer layer 2, but also facilitate the subsequent electroplating layer 3 to adhere to the surface of the frame 1, and enhance the bite force between the electroplating layer 3 and the surface of the frame 1.

[0111] For example, the thickness of the electroplating primer layer 7 can be about 5 um, so that it can not only better cover the defects on the surface of the frame 1 so that the frame 1 shows better flatness, but also maintain a thinner thickness, thereby reducing the overall thickness of the frame 1 and improving the exquisite appearance of the frame 1.

[0112] The main components of the electroplating primer are 40%-50% by weight of a bifunctional polyurethane resin and 20%-30% by weight of a trifunctional polyurethane resin. Then, 20%-30% by weight of a monofunctional polyurethane resin is added to the electroplating primer, and the viscosity of the electroplating primer is adjusted to 1000cps / 25°C to 2000cps / 25°C to ensure good leveling of the appearance area surface and achieve a higher flatness of the appearance surface after electroplating.

[0113] Step S13: forming an electroplating layer 3 on the electroplating primer layer 7 by using an electroplating process.

[0114] In the embodiment of the present application, after the electroplating primer layer 7 is formed on the surface of the frame 1, an electroplating process can be used to form an electroplating layer 3 on the electroplating primer layer 7 to improve the surface brightness of the frame 1. Specifically, the material of the electroplating layer 3 can be indium, tin, or an alloy thereof, and the specific material of the electroplating layer 3 is not limited in the embodiment of the present application.

[0115] In practical applications, the electroplating layer 3 can not only improve the surface brightness of the frame 1 , but also enhance the metallic texture of the appearance of the frame 1 , which is beneficial to improving the metallic texture effect of the surface of the frame 1 .

[0116] Step S14: forming a color paint layer 4 on the electroplating layer 3 by a spraying process.

[0117] In the embodiment of the present application, after the electroplating layer 3 is formed on the surface of the frame 1, a color paint layer 4 can be formed on the electroplating layer 3 by spraying. The color paint layer 4 can be a colored paint film formed on the surface of the frame 1 to present the appearance color effect of the frame 1.

[0118] Specifically, the color paint layer 4 can be made of photocurable coatings, which may include but are not limited to powder coatings or water-based coatings, etc. The embodiment of the present application does not specifically limit the type of photocurable coatings used to make the color paint layer 4.

[0119] Optionally, the coating material of the color paint layer 4 is mainly solvent-based polyurethane resin and colored organic polymer resin.

[0120] In a second aspect, an embodiment of the present application provides a frame body, which is obtained by processing the surface treatment method of the embodiment of the first aspect mentioned above.

[0121] In a third aspect, an embodiment of the present application provides an electronic device, comprising a frame according to an embodiment of the second aspect.

[0122] The electronic devices in the embodiments of the present application include, but are not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, laptops, televisions, driving recorders, and other devices.

[0123] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A surface treatment method for a frame, characterized in that: include: A primer layer, an electroplating layer and a color paint layer are sequentially formed on the surface of the frame; Spraying a first coating on the color paint layer to form a first topcoat layer; A brushed texture is formed on the surface of the first topcoat layer facing away from the color paint layer.

2. The surface treatment method according to claim 1, characterized in that: The step of spraying a first coating on the color paint layer to form a first topcoat layer comprises: Mixing a polyurethane acrylic resin and a photoinitiator to obtain the first coating; Spraying the first coating onto the color paint layer to obtain a first intermediate layer; The first intermediate layer is baked at a first preset temperature using a light curing lamp to obtain the first topcoat layer.

3. The surface treatment method according to claim 2, characterized in that: The polyurethane acrylic resin comprises 3%-7% of a multifunctional polyurethane acrylic resin.

4. The surface treatment method according to claim 1, characterized in that: The thickness L1 of the first topcoat layer satisfies 25um≤L1≤35um.

5. The surface treatment method according to claim 1, characterized in that: After the step of forming a brushed texture on the surface of the first topcoat layer facing away from the color paint layer, A second coating material is sprayed on the first topcoat layer to form a second topcoat layer.

6. The surface treatment method according to claim 5, characterized in that: The step of spraying a second coating on the first topcoat layer to form a second topcoat layer comprises: Mixing a polyurethane acrylic resin, a silicone resin and a photoinitiator to obtain the second coating; Spraying the second coating on the first topcoat layer to obtain a second intermediate layer; The second intermediate layer is baked at a second preset temperature using a light curing lamp to obtain the second topcoat layer.

7. The surface treatment method according to claim 6, characterized in that: The polyurethane acrylic resin comprises 15%-25% of a multifunctional polyurethane acrylic resin.

8. The surface treatment method according to claim 6, characterized in that: The content of the organic silicon resin in the second coating is 25%-35%.

9. The surface treatment method according to claim 5, characterized in that: The thickness L2 of the second topcoat layer satisfies, L2≤10um.

10. A frame, characterized in that: The frame is obtained by processing through the surface treatment method described in any one of claims 1 to 9.

11. An electronic device, characterized in that: The electronic device comprises: the frame according to claim 10.

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