CN113498285A

CN113498285A - Shell assembly, preparation method thereof and electronic equipment

Info

Publication number: CN113498285A
Application number: CN202010270067.2A
Authority: CN
Inventors: 黄志勇
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-10-12
Anticipated expiration: 2040-04-08
Also published as: CN113498285B

Abstract

The application provides a shell assembly, a preparation method thereof and an electronic device. The housing assembly includes: the antenna isolation structure comprises a substrate, a metal substrate and a metal shell, wherein the substrate is a plastic substrate or a metal substrate, the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, and the plastic strip is filled in the antenna isolation groove; a primer layer disposed on the outer surface of the substrate; the silver paint layer is arranged on the surface of the primer layer far away from the base material, and the silver paint layer contains first silver powder; and the surface paint layer is arranged on one side of the silver paint layer, which is far away from the substrate. The silver paint layer can provide a better metal appearance effect for the shell assembly, and the shell assembly has a uniform and consistent all-metal appearance effect due to the fact that the silver paint layer is arranged on the whole outer surface of the base material; the shell assembly with the structure has no special requirements on the position and the size of the antenna partition groove, and can well meet the requirements of antenna signals of 5G electronic equipment.

Description

Shell assembly, preparation method thereof and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a shell assembly, a preparation method of the shell assembly and the electronic equipment.

Background

Metal has high-end fashionable appearance and good heat conduction capability, so the metal is widely applied to the mobile phone industry as a mobile phone middle frame or a rear shell, but in order to ensure that antenna signals are not interfered, an antenna plastic isolation groove is usually arranged on a rear cover or a middle frame of a metal shell, plastic strips are injected in the antenna isolation groove, especially as the 5G era comes, the mobile phone needs more frequency bands to be increased to realize the smoothness of 5G signals, and the mobile phone middle frame or the rear cover needs more antenna plastic isolation grooves. However, the existing metal shell appearance surface treatment methods, such as aluminum alloy anodizing, PVD and other methods, cannot shield and separate the plastic strip, and in order to ensure the appearance, the design of the antenna is limited to a certain extent, which may finally cause that the mobile phone antenna signal cannot meet the user requirements.

Therefore, research on the housing assembly is awaited.

Disclosure of Invention

The present application is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present application is to provide a housing assembly having an all-metal appearance effect.

In one aspect of the present application, a housing assembly is provided. According to an embodiment of the application, the housing assembly comprises: the antenna isolation structure comprises a substrate, wherein the substrate is a plastic substrate or a metal substrate, the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, and the plastic strip is filled in the antenna isolation groove; a primer layer disposed on an outer surface of the substrate; the silver paint layer is arranged on the surface of the priming paint layer far away from the base material, and the silver paint layer contains first silver powder; the surface paint layer is arranged on one side, away from the base material, of the silver paint layer. Therefore, the primer layer can improve the binding force between the base material and the silver paint layer and shield the base material so as to avoid influencing the appearance effect of the shell assembly; the first silver powder in the silver paint layer can provide a better metal appearance effect for the shell assembly, and the silver paint layer is arranged on the whole outer surface of the substrate (when the metal substrate is used, the silver paint layer comprises the outer surface of the metal shell body and the outer surface of the plastic strip), so that the shell assembly has a uniform and consistent all-metal appearance effect; the arrangement of the finish paint layer can effectively protect and shield the part gloss; moreover, the arrangement of the primer layer, the silver paint layer and the finish paint layer can not cause interference on antenna signals of the electronic equipment; moreover, the shell assembly with the structure has no special requirements on the position and the size of the antenna isolation groove, and can well meet the requirements of antenna signals of 5G electronic equipment.

In another aspect of the present application, a method of making the housing assembly described above is provided. According to an embodiment of the application, a method of preparing a housing assembly comprises: providing a substrate which is a plastic substrate or a metal substrate, wherein the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, and the plastic strip is filled in the antenna isolation groove; applying a primer coating on the outer surface of the substrate to form a primer layer; coating a silver paint on the surface of the primer layer far away from the substrate so as to form a silver paint layer, wherein the silver paint contains first silver powder; and coating a finishing paint on the side of the silver paint layer far away from the substrate so as to form a finishing paint layer. Therefore, the primer layer can improve the binding force between the base material and the silver paint layer and shield the base material so as to avoid influencing the appearance effect of the shell assembly; the silver paint layer can provide a better metal appearance effect for the shell assembly, and the silver paint layer is arranged on the whole outer surface of the substrate (when the metal substrate is used, the silver paint layer comprises the outer surfaces of the metal shell body and the plastic strip), so that the shell assembly has a uniform and consistent all-metal appearance effect; the arrangement of the finish paint layer can effectively protect and shield the part gloss; moreover, the arrangement of the primer layer, the silver paint layer and the finish paint layer can not cause interference on antenna signals of the electronic equipment; moreover, the shell assembly of the structure has no special requirements on the position and the size of the antenna isolation groove, and can well meet the requirements of antenna signals of 5G electronic equipment; in addition, the preparation method is simple and easy to operate, convenient for industrial production and low in cost.

In yet another aspect of the present application, an electronic device is provided. According to an embodiment of the present application, the electronic device includes: the housing assembly described above; the display screen assembly is connected with the shell assembly, and an installation space is defined between the display screen assembly and the shell assembly; the main board is arranged in the mounting space and is electrically connected with the display screen assembly; the antenna assembly is arranged on the surface, close to the display screen assembly, of the shell assembly and is electrically connected with the mainboard, wherein at least one part of the antenna assembly is in positive correspondence with the plastic strip in the substrate. Therefore, the shell assembly of the electronic equipment has uniform and consistent all-metal appearance effect, and can effectively meet the use requirement of 5G electronic equipment on antenna signals. Those skilled in the art will appreciate that the electronic device has all of the features and advantages of the housing assembly described above and will not be described in detail herein.

Drawings

Fig. 1 is a schematic structural diagram of a metal shell body according to an embodiment of the present application.

FIG. 2 is a schematic view of a metal substrate according to another embodiment of the present disclosure.

Fig. 3 is a cross-sectional view along AA' in fig. 2.

Fig. 4 is a schematic structural view of a housing assembly according to another embodiment of the present application.

Fig. 5 is a schematic structural view of a housing assembly according to another embodiment of the present application.

Fig. 6 is a schematic structural view of a housing assembly according to yet another embodiment of the present application.

Fig. 7 is a flow chart of a method of preparing a housing assembly according to yet another embodiment of the present application.

Fig. 8 is a schematic structural diagram of an electronic device in another embodiment of the present application.

Detailed Description

Embodiments of the present application are described in detail below. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the present disclosure. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

In one aspect of the present application, a housing assembly is provided. According to an embodiment of the present application, referring to fig. 1 to 4 (fig. 3 is a cross-sectional view along AA' in fig. 2), the housing assembly includes: a substrate 10 (see fig. 2), which is a plastic substrate or a metal substrate (in the drawings, a metal substrate is taken as an example), wherein the metal substrate 10 includes a metal housing body 11 and a plastic strip 12, wherein the metal housing body 11 has at least one antenna isolation groove 111 (see fig. 1) penetrating through the metal housing body 11, and the plastic strip 12 is filled in the antenna isolation groove 111 (see fig. 2 and 3); a primer layer 20, the primer layer 20 being disposed on an outer surface of the substrate 10; the silver paint layer 30, the silver paint layer 30 is arranged on the surface of the primer layer 20 far away from the substrate 10, and the silver paint layer 30 contains first silver powder; and the finishing paint layer 40 is arranged on one side of the silver paint layer 30 far away from the substrate 10. Therefore, the primer layer can improve the binding force between the base material and the silver paint layer and shield the base material so as to avoid influencing the appearance effect of the shell assembly; the silver paint layer contains silver powder, so that a better metal appearance effect can be provided for the shell assembly, and the silver paint layer is arranged on the whole outer surface of the substrate (when the metal substrate is used, the silver paint layer comprises the outer surfaces of the metal shell body and the plastic strip), so that the shell assembly has a complete, uniform and consistent all-metal appearance effect, and a gap between the plastic strip 12 and the metal shell body 11 is not exposed; the arrangement of the finish paint layer can effectively protect and shield the part gloss; moreover, the arrangement of the primer layer, the silver paint layer and the finish paint layer can not cause interference on antenna signals of the electronic equipment; moreover, the shell assembly with the structure has no special requirements on the position and the size of the antenna isolation groove, and can well meet the requirements of antenna signals of 5G electronic equipment.

The "outer surface of the base material" refers to a surface of the base material close to the outer surface of the housing unit.

As can be understood by those skilled in the art, when the substrate is a plastic substrate, the ceiling incense isolating groove does not need to be arranged in the plastic substrate. The specific material of the plastic substrate has no special requirement, and those skilled in the art can flexibly select the material according to actual requirements, for example, the material can be PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), a composite plate of PC and PMMA, a composite plate of PET and PMMA, or the like.

Wherein, the concrete material of metal casing body and plastic strip does not have special requirement, and the skilled person in the art can select according to actual conditions is nimble. In some embodiments, the specific material of the metal shell body can be selected from iron, aluminum alloy, magnesium alloy or stainless steel; in some embodiments, specific materials of the plastic layer include, but are not limited to, PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), or ABS.

According to the embodiment of the application, the shape structure of the metal shell body has no special requirement, and a person skilled in the art can flexibly select the shape structure according to actual requirements, and the shape structure can be a 2D structure, a 2.5D structure or a 3D structure, and when the technical shell body is the 2.5D structure or the 3D structure, the metal shell body is composed of the rear cover 14 and the middle frame 15 (as shown in fig. 2). In addition, the specific position and number of the antenna isolation slot 111 in the metal housing body 11 are not limited, and those skilled in the art may flexibly select the antenna isolation slot 111 according to actual requirements such as the specific installation position of the antenna, the antenna isolation slot 111 may be disposed in the rear cover 14, the antenna isolation slot 111 may also be disposed in the middle frame 15, the antenna isolation slot 111 may also be disposed in the rear cover 14 and the middle frame 15, and the description will be given by taking the example that the antenna isolation slot 111 is disposed in the middle frame 15 in the drawings of the present application.

According to the examples of the present application, the silver paint coating comprises, in mass percent, based on the total mass of the silver paint coating forming the silver paint layer: 20-50% of polyurethane resin (such as 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38%, 40%); 1-3% of anti-settling agent (such as 1%, 1.5%, 2%, 2.5%, 3%); 0.5 to 1 percent (such as 0.5 percent, 0.8 percent and 1 percent) of dispersant; 0.3 to 0.5 percent (such as 0.3 percent, 0.4 percent and 0.5 percent) of flatting agent; 1% to 1.5% of a wetting agent (e.g. 1%, 1.3%, 1.5%); 2% -10% (2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%) of the first silver powder; 5-10% of polyurethane curing agent (such as 5%, 7%, 9%, 10%); and the balance of diluent. The silver paint layer prepared by the components and the proportion can provide a better metal appearance effect for the shell assembly, and cannot interfere with an antenna signal of electronic equipment; if the mass percentage of the first silver powder is higher than 10%, because the main component of aluminum in the silver powder is aluminum, the excessive silver powder has the risk of interfering the antenna signal; if the content of the first silver powder is less than 2%, the metallic texture of the appearance of the case assembly is relatively poor.

The specific materials of the polyurethane resin, the anti-settling agent, the dispersing agent, the leveling agent, the wetting agent, the polyurethane curing agent and the diluent in the silver paint coating are not particularly required, and those skilled in the art can flexibly select the applicable specific materials in the prior art according to actual requirements, and detailed descriptions thereof are omitted.

Furthermore, the specific composition and ratio of the first silver powder have no special requirements, and those skilled in the art can flexibly select or purchase the first silver powder from the market according to actual conditions. In some embodiments, the first silver powder comprises 90.0-95.0% pure aluminum, 3.0-5.0% pure copper, 0.1-1% brightener, and 3.0-5.0% organic coating material. Wherein the organic coating material is selected from at least one of modified acrylic resin, modified epoxy resin and silane coupling agent.

Further, the average particle size of the first silver powder is 5 to 10 micrometers, such as 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers or 10 micrometers. Therefore, the first silver powder with the particle size can effectively improve the metal texture of the appearance of the shell assembly, and further improve the appearance effect of the shell assembly; if the average particle size of the first silver powder is larger than 10 micrometers, the surface of the silver paint layer is rough, so that the appearance of the shell assembly is rough or discontinuous in sand feeling, and the appearance effect of the shell is affected; if the average particle size of the first silver powder is less than 5 μm, the graininess of the silver paint layer is relatively fine, the metal graininess is poor, and further the metal texture of the shell assembly is relatively poor.

Further, the thickness of the silver paint layer is 5-8 microns, such as 5 microns, 6 microns, 7 microns and 8 microns. Therefore, good metal texture of the appearance of the shell assembly can be effectively ensured; if the thickness of the silver paint layer is less than 5 micrometers, the metal texture of the shell assembly is relatively poor; if the thickness of silver paint layer is greater than 8 microns, not only can not further promote the metal feel of casing subassembly, but also can cause the waste of material, increase cost.

According to an embodiment of the present application, referring to fig. 5, the housing assembly further comprises: a colored paint layer 50, the colored paint layer 50 being disposed between the silver paint layer 30 and the topcoat layer 40. From this, can provide the outward appearance colour for the casing subassembly to satisfy the diversified demand of user to casing subassembly outward appearance colour.

Furthermore, the second silver powder is contained in the colored paint layer, and the addition of the second silver powder can further improve the metal texture and the metal granular feel of the appearance of the shell assembly.

Further, the second silver powder is contained in an amount of 1% to 3% (e.g., 1%, 1.5%, 2%, 2.5%, 3%) by mass based on the colored paint coating forming the colored paint layer. Therefore, the metal texture and the metal particle texture of the colored paint layer can be better improved, and the color and the glossiness of the colored paint layer cannot be influenced by the second silver powder with the content.

Wherein the colored paint coating for forming the colored paint layer comprises (by mass percent): 30-50% of polyurethane resin, 25-35% of color paste, 3-10% of pearl powder, 1-3% of second silver powder, 1-2% of pearl powder, 1-2% of anti-settling agent, 0.5-1% of dispersing agent, 0.3-0.5% of flatting agent, 1-1.5% of wetting agent, 3-5% of polyurethane curing agent and the balance of diluent. Therefore, the obtained colored paint layer has better fineness and better metal texture.

The specific materials and types of the polyurethane resin, the color paste, the pearl powder, the anti-settling agent, the dispersing agent, the leveling agent, the wetting agent, the polyurethane curing agent and the diluent in the colored paint coating have no special requirements, and the applicable specific materials in the prior art can be flexibly selected by the skilled in the art according to the actual requirements, and the detailed description is omitted here.

Wherein the average particle size of the second silver powder is 5-10 micrometers (such as 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers or 10 micrometers). Therefore, the second silver powder with the particle size can effectively improve the metal texture of the appearance of the shell assembly, and further improve the appearance effect of the shell assembly; if the average particle size of the second silver powder is larger than 10 micrometers, the surface of the colored paint layer is rough, so that the appearance of the shell assembly is rough or discontinuous in sand feeling, and the appearance effect of the shell is affected; if the average particle size of the second silver powder is less than 5 micrometers, the sanding feeling of the colored paint layer is relatively fine, the metal granular feeling is poor, and the improvement of the metal texture of the appearance is not facilitated.

Further, the average particle diameter of the second silver powder is smaller than that of the first silver powder. Therefore, the metal texture of the appearance of the shell assembly has layering, and the appearance effect of the shell assembly is further improved.

According to an embodiment of the present application, referring to fig. 6, the primer layer 20 includes: a first primer layer 21, the first primer layer 21 being disposed on the outer surface of the substrate 10; a second primer layer 22, the second primer layer 22 being disposed on a surface of the first primer layer 21 remote from the substrate 10; a third primer layer 23, the third primer layer 23 being disposed on a surface of the second primer layer 22 away from the substrate 10, wherein a color of the second primer layer 22 and a color of the third primer layer 23 are white, respectively. Thus, the arrangement of the first primer layer can effectively improve the adhesion between the substrate and the second primer layer; the second primer layer and the third primer layer are arranged to effectively cover the base material, so that the appearance effect of the shell assembly is not influenced, and the adhesion force between the layer structures can be further enhanced.

The terms "first" and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Further, the thickness of the first primer layer is 2-8 micrometers (such as 2 micrometers, 3 micrometers, 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers and 8 micrometers), the thickness of the second primer layer is 10-20 micrometers (such as 10 micrometers, 12 micrometers, 14 micrometers, 16 micrometers, 18 micrometers and 20 micrometers), and the thickness of the third primer layer is 15-30 micrometers (such as 15 micrometers, 18 micrometers, 20 micrometers, 23 micrometers, 25 micrometers, 28 micrometers and 30 micrometers). Therefore, the primer layer has a good substrate shielding effect, and the adhesive force between the substrate and the silver paint layer is effectively improved.

Further, the surface roughness Ra of the third primer layer surface is 0.01 to 0.1, for example, Ra is 0.01, Ra is 0.02, Ra is 0.04, Ra is 0.06, Ra is 0.08, and Ra is 0.1. Therefore, the surface of the third primer layer is relatively flat and smooth, and the appearance effect of the shell assembly is further improved; if the surface roughness is greater than 0.1, the appearance of the housing assembly may be visually relatively rough.

According to the embodiment of the application, specific components and proportions of the first primer coating used for preparing the first primer layer, the second primer coating used for preparing the second primer layer and the third primer coating used for preparing the third primer layer are not required to be special, and the skilled person can flexibly select the components according to actual needs. In some embodiments, the first primer coating used in the preparation of the first primer layer is a polyurethane paint containing 0.4-1.2% of an aminosilane coupling agent, so as to increase the adhesion between the second primer layer and the substrate; the second primer coating used for preparing the second primer layer belongs to polyurethane paint, and comprises 20-30% of titanium dioxide, 10-20% of talcum powder and 10-20% of calcium carbonate, so that the base material can be better covered; the third primer coating used for preparing the third primer layer belongs to polyurethane paint, and comprises 30-40% of titanium dioxide, 20-30% of talcum powder and 20-30% of calcium carbonate, so that the base material can be better covered.

According to the embodiment of the application, the specific components and the proportion of the finish paint used for preparing the finish paint layer are not particularly required, and the person skilled in the art can flexibly select the finish paint according to the actual requirement. In some embodiments, the topcoat coating used to prepare the topcoat layer is an acrylic paint containing 5% to 20% of a matte powder. Therefore, the protective effect of the finish paint layer on the shell assembly is better.

The thickness of the surface paint layer is 15-25 micrometers, such as 15 micrometers, 17 micrometers, 19 micrometers, 20 micrometers, 21 micrometers, 23 micrometers or 25 micrometers. Therefore, the protective effect of the finish paint layer on the shell assembly is better.

In another aspect of the present application, a method of making the housing assembly described above is provided. According to an embodiment of the present application, referring to fig. 7, a method of preparing a housing assembly includes:

s100: providing a substrate 10, wherein the substrate is a plastic substrate or a metal substrate, the metal substrate 10 includes a metal housing body 11 and a plastic strip 12, the metal housing body 11 has at least one antenna isolation groove 111 penetrating through the metal housing body 11, and the plastic strip 12 is filled in the antenna isolation groove 111, and the structural schematic diagrams refer to fig. 1 to 3.

Furthermore, the outer surface of the base material can be subjected to sand blasting in advance to coarsen the outer surface of the base material, so that the surface area of the base material is increased, and the adhesive force between the base material and the coating is improved; after the sand blasting treatment, the base material can be subjected to passivation treatment or film coating treatment, so that a fine micropore structure is formed on the outer surface of the base material, and the bonding force between the base material and the primer layer is improved.

The specific method steps of the sand blasting treatment have no special requirements, and the skilled person can flexibly select the method according to the actual situation. In some embodiments, the type of the gravel adopted in the sand blasting treatment is 170# to 205# zirconium sand, the sand blasting pressure is 2.0Mpa, the sand blasting walking speed is 13 Hz to 16Hz, the sand gun is arranged on the surface perpendicular to the moving direction of the base material and swings back and forth at an included angle of 45 degrees with the normal direction of the large surface of the base material, the roughness Ra 0.75 to 1.2 of the sand surface obtained after the sand blasting treatment is sequentially increased, and the bonding force of the first primer layer on the outer surface of the base material is further improved.

The specific steps of the passivation treatment and the skin treatment are not particularly required, and those skilled in the art can flexibly select the steps according to actual conditions, and are not described in detail herein.

S200: a primer coating is applied on the outer surface of the substrate 10 to form a primer layer 20.

Wherein the step of forming the primer layer 20 includes:

s210: a first primer coating is applied on the outer surface of the substrate 10 to form a first primer layer 21. The first primer coating is subjected to thermosetting to obtain a first primer layer, the thermosetting baking temperature is 60-80 ℃, and the baking time is 0.5-1 hour.

S220: a second primer coating is applied to the surface of the first primer layer 21 remote from the substrate 10 to form a second primer layer 22. And thermosetting the second primer coating to obtain a second primer layer, wherein the thermosetting baking temperature is 80-110 ℃, and the baking time is 0.5-1 hour.

S230: a third primer coating is applied to the surface of the second primer layer 22 remote from the substrate 10 to form a third primer layer 23. And thermosetting the third primer coating to obtain a third primer layer, wherein the thermosetting baking temperature is 80-110 ℃, and the baking time is 0.5-1 hour.

Further, before forming the silver paint layer, the method further comprises the following steps: and polishing the surface of the primer layer. When the primer layer comprises the first primer layer, the second primer layer and the third primer layer, the surface of the third primer layer far away from the substrate needs to be subjected to sanding treatment. Through the polishing treatment, the surface of the third primer layer is better, smooth and bright, and the appearance effect of the shell assembly is further improved. In some embodiments, after the polishing treatment, the surface roughness Ra of the surface of the third primer layer is 0.01 to 0.1, such as Ra 0.01, Ra 0.02, Ra 0.04, Ra 0.06, Ra 0.08, and Ra 0.1.

The specific method and steps of the polishing treatment have no special requirements, and the skilled person can flexibly select the polishing treatment according to the actual requirements. In some embodiments, 2000#, 3000#, 5000# sandpaper is used to sequentially buff to obtain a smooth and bright third primer layer.

S300: a silver paint is applied on the surface of the primer layer 20 remote from the substrate 10 to form a silver paint layer 30, the silver paint containing a first silver powder. First silver powder in the silver paint layer can provide the metal feel of preferred for the casing subassembly, can guarantee the whole surface of substrate (including the surface of metal casing body and plastic strip), and then makes the casing subassembly have the even unanimous outward appearance effect of all metals.

The silver paint coating is thermally cured to obtain a silver paint layer, the baking temperature of the silver paint coating is respectively 75-85 ℃ (such as 75 ℃, 77 ℃, 79 ℃, 80 ℃, 81 ℃, 83 ℃ and 85 ℃), and the baking time is respectively 0.5-1 hour, such as 30 minutes, 40 minutes, 50 minutes or 1 hour. Therefore, under the baking condition, the silver paint can be quickly and effectively cured, and the silver paint cannot be adversely affected; if the baking temperature is less than 75 ℃, relatively long baking time is needed, and the efficiency is low; if the baking temperature is higher than 85 ℃, the silver paint coating can generate side reaction due to high temperature, and the metal texture of the silver paint layer is influenced.

According to an embodiment of the application, the method of preparing the housing assembly further comprises: the surface of the silver paint layer 30 far from the substrate 10 is coated with a colored paint coating to form a colored paint layer 50, and the structural schematic diagrams refer to fig. 5 and 6. From this, can provide the outward appearance colour for the casing subassembly to satisfy the diversified demand of user to casing subassembly outward appearance colour.

Further, the color paint layer contains second silver powder, and the average particle size of the second silver powder is 5-10 micrometers (such as 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers or 10 micrometers). Therefore, the addition of the second silver powder can further improve the metal texture and the metal particle texture of the appearance of the shell assembly, and the second silver powder with the particle size can effectively improve the metal texture of the appearance of the shell assembly, so that the appearance effect of the shell assembly is further improved; if the average particle size of the second silver powder is larger than 10 micrometers, the surface of the colored paint layer is rough, so that the appearance of the shell assembly is rough or discontinuous in sand feeling, and the appearance effect of the shell is affected; if the average particle size of the second silver powder is less than 5 micrometers, the sanding feeling of the colored paint layer is relatively fine, the metal granular feeling is poor, and the improvement of the metal texture of the appearance is not facilitated.

Further, the colored paint coating is thermally cured to obtain a colored paint layer, the baking temperature of the colored paint coating is respectively 75-85 ℃ (such as 75 ℃, 77 ℃, 79 ℃, 80 ℃, 81 ℃, 83 ℃ and 85 ℃), and the baking time is respectively 0.5-1 hour, such as 30 minutes, 40 minutes, 50 minutes or 1 hour. Therefore, under the baking condition, the colored paint can be quickly and effectively cured, and the colored paint cannot be adversely affected; if the baking temperature is less than 75 ℃, relatively long baking time is needed, and the efficiency is low; if the baking temperature is higher than 85 ℃, the side reaction of the colored paint coating can be caused due to the high temperature, and the texture of the colored paint layer is influenced.

S400: a top coat paint is applied to the side of the silver paint layer 30 remote from the substrate 10 to form a top coat layer 40, and the structural schematic diagrams refer to fig. 4, 5 and 6.

Wherein the curing conditions of the finish paint are as follows: UV energy 800mj/cm²～1200mj/cm²The baking temperature is 50-60 ℃ (50 ℃, 52 ℃, 54 ℃, 56 ℃, 58 ℃ and 60 ℃) respectively, and the baking time is 10-20 minutes, such as 10 minutes, 13 minutes, 15 minutes, 18 minutes or 20 minutes respectively. Therefore, under the curing conditions, the finishing paint can be cured quickly and effectively without causing adverse effect on the finishing paint; if the baking temperature is less than 50 ℃ or the UV curing energy is less than 800mj/cm²Relatively long baking time is needed, and the efficiency is low; if the baking temperature is more than 85 ℃ or the UV curing energy is less than 1200mj/cm²The side reaction of the finish paint can be caused due to high temperature, the quality of the finish paint layer is influenced, and the appearance effect of the shell assembly is further influenced.

According to the embodiment of the application, the primer layer can improve the bonding force between the base material and the silver paint layer and shield the base material so as to avoid influencing the appearance effect of the shell assembly; the silver paint layer can provide a better metal appearance effect for the shell assembly, and the silver paint layer is arranged on the whole outer surface of the substrate, so that the shell assembly has a uniform and consistent all-metal appearance effect; the arrangement of the finish paint layer can effectively protect and shield the part gloss; moreover, the arrangement of the primer layer, the silver paint layer and the finish paint layer can not cause interference on antenna signals of the electronic equipment; moreover, the shell assembly of the structure has no special requirements on the position and the size of the antenna isolation groove, and can well meet the requirements of antenna signals of 5G electronic equipment; in addition, the preparation method is simple and easy to operate, convenient for industrial production and low in cost.

According to an embodiment of the present application, the above method for preparing the housing assembly may be used to prepare the housing assembly described above, wherein the requirements for the thickness and composition of the primer layer, the thickness and composition distribution ratio of the silver paint layer, the thickness and composition distribution ratio of the color paint layer, the thickness and composition of the top paint layer, the particle diameters of the first silver powder and the second silver powder, and other factors in the preparation method are the same as those described above, and are not repeated herein.

In yet another aspect of the present application, an electronic device is provided. According to an embodiment of the present application, referring to fig. 8, the electronic apparatus includes: the housing assembly 100 described above; the display screen assembly 200, the display screen assembly 200 is connected with the shell assembly 100, and an installation space is defined between the display screen assembly 200 and the shell assembly 100; and a main board (not shown in fig. 8) disposed in the installation space and electrically connected to the display panel assembly 200; and an antenna assembly (not shown in fig. 8) disposed on a surface of the housing assembly 100 adjacent to the display screen assembly 200 and electrically connected to the motherboard, wherein at least a portion of the antenna assembly is directly corresponding to the plastic strip in the substrate. Therefore, the shell assembly of the electronic equipment has uniform and consistent all-metal appearance effect, and can effectively meet the use requirement of 5G electronic equipment on antenna signals. Those skilled in the art will appreciate that the electronic device has all of the features and advantages of the housing assembly described above and will not be described in detail herein.

According to the embodiments of the present application, the specific type of the electronic device has no special requirement, and those skilled in the art can flexibly select the specific type according to actual requirements.

Examples

Example 1

The method of making the housing assembly comprises:

step 1: providing a metal substrate, wherein the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, the plastic strip is filled in the antenna isolation groove, and the surface of the substrate is subjected to sand blasting treatment and passivation treatment in advance.

Step 2: coating a first primer coating on an outer surface of a metal substrate to form a first primer layer, wherein the primer coating has a baking temperature of 80 ℃ and a baking time of 0.5 hours.

And step 3: and coating a second primer coating on the surface of the first primer layer far away from the metal substrate so as to form a second primer layer, wherein the baking temperature of the primer coating is 80 ℃, and the baking time is 0.5 hour.

And 4, step 4: and coating a third primer coating on the surface of the second primer layer far away from the metal substrate so as to form a third primer layer, wherein the baking temperature of the primer coating is 110 ℃, and the baking time is 0.5 hour.

And 5: and coating a silver paint coating on the surface of the third primer layer far away from the metal substrate so as to form a silver paint layer, wherein the silver paint coating contains first silver powder, the baking temperature of the silver paint coating is 85 ℃, the baking time is 0.5 hour, and the silver paint coating comprises.

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 75 ℃, the baking time is 0.5 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 microns, and the proportion of the second silver powder in the colored paint coating is 3 percent.

And 7: coating a top coat paint on the side of the color paint layer far away from the metal substrate so as to form a top paint layer, wherein the baking temperature of the top coat paint is 50 ℃, the baking time is 20min, and the UV energy is 800mj/cm²。

Example 2

The method of making the housing assembly comprises:

And step 3: and coating a second primer coating on the surface of the first primer layer far away from the metal substrate so as to form a second primer layer, wherein the baking temperature of the primer coating is 110 ℃, and the baking time is 0.5 hour.

And 4, step 4: and coating a third primer coating on the surface of the second primer layer far away from the metal substrate so as to form a third primer layer, wherein the baking temperature of the primer coating is 80 ℃, and the baking time is 1.0 hour.

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 75 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 micrometers, and the proportion of the second silver powder in the colored paint coating is 3 percent.

And 7: applying a top coat to the side of the pigmented layer remote from the metal substrate to form a top coat layerWherein the baking temperature of the finish paint is 50 ℃, the baking time is 20min, and the UV energy is 1000mj/cm²。

Example 3

The method of making the housing assembly comprises:

Step 2: coating a first primer coating on an outer surface of a metal substrate to form a first primer layer, wherein the primer coating has a baking temperature of 60 ℃ and a baking time of 1.0 hour.

And step 3: and coating a second primer coating on the surface of the first primer layer far away from the metal substrate so as to form a second primer layer, wherein the baking temperature of the primer coating is 80 ℃, and the baking time is 1.0 hour.

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 75 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average grain diameter of the second silver powder is 5 microns, and the proportion of the second silver powder in the colored paint coating is 3 percent.

And 7: coating a finish paint on the side of the color paint layer far away from the metal substrate so as to form a finish paint layer, wherein the baking temperature of the finish paint is 60 ℃, the baking time is 10min, and the UV energy is 1000mj/cm²。

Example 4

The method of making the housing assembly comprises:

And step 3: and coating a second primer coating on the surface of the first primer layer far away from the metal substrate so as to form a second primer layer, wherein the baking temperature of the primer coating is 90 ℃, and the baking time is 0.5 hour.

And 4, step 4: and coating a third primer coating on the surface, far away from the metal substrate, of the second primer layer so as to form a third primer layer, wherein the baking temperature of the primer coating is 100 ℃, and the baking time is 1.0 hour.

And 5: and coating a silver paint coating on the surface of the third primer layer far away from the metal substrate so as to form a silver paint layer, wherein the silver paint coating contains first silver powder, the baking temperature of the silver paint coating is 75 ℃, the baking time is 1.0 hour, and the silver paint coating comprises.

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 85 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 micrometers, and the proportion of the second silver powder in the colored paint coating is 3 percent.

And 7: coating a top coat paint on the side of the color paint layer far away from the metal substrate so as to form a top paint layer, wherein the baking temperature of the top coat paint is 55 ℃, the baking time is 15min, and the UV energy is 1200mj/cm²。

Example 5

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 10 microns.

Example 6

The method of making the housing assembly comprises:

Step 2: coating a first primer coating on an outer surface of the metal substrate to form a first primer layer, wherein the primer coating has a baking temperature of 60 ℃ and a baking time of 0.5 hours.

And 5: and coating a silver paint coating on the surface of the third primer layer far away from the metal substrate so as to form a silver paint layer, wherein the silver paint coating contains first silver powder, the baking temperature of the silver paint coating is 80 ℃, the baking time is 0.5 hour, and the silver paint coating comprises.

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 micrometers, and the proportion of the second silver powder in the colored paint coating is 1 percent.

And 7: coating a top coat paint on the side of the color paint layer far away from the metal substrate so as to form a top paint layer, wherein the baking temperature of the top coat paint is 50 ℃, the baking time is 20min, and the UV energy is 1000mj/cm²。

Example 7

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 10 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 micrometers, and the proportion of the second silver powder in the colored paint coating is 2 percent.

Example 8

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 3 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 2 microns, and the proportion of the second silver powder in the colored paint coating is 3 percent.

Example 9

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 5 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 3 micrometers, and the proportion of the second silver powder in the colored paint coating is 3 percent.

Example 10

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 7 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 5 micrometers, and the proportion of the second silver powder in the colored paint coating is 3 percent.

Example 11

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 10 microns.

Example 12

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 13 microns.

Example 13

The method of making the housing assembly comprises:

Wherein the average grain diameter of the first silver powder is 5 microns.

Step 6: and coating a colored paint coating on the surface of the silver paint layer far away from the metal base material so as to form the colored paint layer, wherein the baking temperature of the colored paint coating is 80 ℃, the baking time is 1.0 hour, the colored paint layer contains the second silver powder, the average particle size of the second silver powder is 8 microns, and the proportion of the second silver powder in the colored paint coating is 3 percent.

The variables parameters in the different examples are referenced in table 1, except for the variables in table 1, all other parameters and steps are in accordance with example 1.

TABLE 1

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A housing assembly, comprising:

the antenna isolation structure comprises a substrate, wherein the substrate is a plastic substrate or a metal substrate, the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, and the plastic strip is filled in the antenna isolation groove;

a primer layer disposed on an outer surface of the substrate;

the silver paint layer is arranged on the surface of the priming paint layer far away from the base material, and the silver paint layer contains first silver powder; and

the surface paint layer is arranged on one side, away from the base material, of the silver paint layer.

2. The housing assembly of claim 1, wherein the silver paint coating comprises, in mass percent, based on the total mass of silver paint coating forming the silver paint layer:

20 to 50 percent of polyurethane resin;

1 to 3 percent of anti-settling agent;

0.5 to 1 percent of dispersant;

0.3 to 0.5 percent of flatting agent;

1 to 1.5 percent of wetting agent;

2% -10% of the first silver powder;

5 to 10 percent of polyurethane curing agent; and

the balance of diluent.

3. The casing assembly according to claim 1 or 2, wherein the first silver powder has an average particle diameter of 5 to 10 μm.

4. The housing assembly of claim 1 or 2, wherein the silver paint layer has a thickness of 5 to 8 μm.

5. The housing assembly of claim 1, further comprising:

the color paint layer is arranged between the silver paint layer and the finish paint layer.

6. The housing assembly of claim 5, wherein the layer of colored paint contains a second silver powder,

optionally, the content of the second silver powder is 1% to 3% by mass based on the colored paint coating forming the colored paint layer.

7. The casing assembly according to claim 6, wherein the second silver powder has an average particle diameter of 5 to 10 μm,

optionally, the average particle size of the second silver powder is smaller than the average particle size of the first silver powder.

8. The housing assembly of claim 1 or 5, wherein the primer layer comprises:

a first primer layer disposed on the outer surface of the substrate;

a second primer layer disposed on a surface of the first primer layer remote from the substrate;

a third primer layer disposed on a surface of the second primer layer remote from the substrate,

wherein the color of the second primer layer and the color of the third primer layer are white, respectively.

9. The housing assembly of claim 8 wherein the first primer layer has a thickness of 2 to 8 microns, the second primer layer has a thickness of 10 to 20 microns, and the third primer layer has a thickness of 15 to 30 microns.

10. The housing assembly of claim 8, wherein the third primer layer has a surface roughness Ra of 0.01 to 0.1.

11. A method of making the housing assembly of any one of claims 1 to 10, comprising:

providing a substrate which is a plastic substrate or a metal substrate, wherein the metal substrate comprises a metal shell body and a plastic strip, the metal shell body is provided with at least one antenna isolation groove penetrating through the metal shell body, and the plastic strip is filled in the antenna isolation groove;

applying a primer coating on the outer surface of the substrate to form a primer layer;

coating a silver paint on the surface of the primer layer far away from the substrate so as to form a silver paint layer, wherein the silver paint contains first silver powder; and

and coating a finishing paint on the side of the silver paint layer far away from the substrate so as to form a finishing paint layer.

12. The method of claim 11, further comprising, prior to applying the topcoat coating:

and coating a colored paint coating on the surface of the silver paint layer far away from the substrate so as to form a colored paint layer.

13. The method according to claim 11 or 12, wherein before forming the silver paint layer, further comprising: and polishing the surface of the primer layer.

14. The method according to claim 11 or 12, wherein the silver paint coating and the colored paint coating are baked at 75-85 ℃ for 0.5-1 hour respectively.

15. An electronic device, comprising:

the housing assembly of any one of claims 1 to 10;

the display screen assembly is connected with the shell assembly, and an installation space is defined between the display screen assembly and the shell assembly; and

the main board is arranged in the mounting space and is electrically connected with the display screen assembly;

the antenna assembly is arranged on the surface, close to the display screen assembly, of the shell assembly and is electrically connected with the mainboard, wherein at least one part of the antenna assembly is in positive correspondence with the plastic strip in the substrate.