CN114071918A

CN114071918A - Shell, preparation method thereof and electronic equipment

Info

Publication number: CN114071918A
Application number: CN202111340867.8A
Authority: CN
Inventors: 郭林海; 林志龙
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-02-18
Anticipated expiration: 2041-11-12
Also published as: CN114071918B; CN117812859A

Abstract

The application provides a shell, a preparation method thereof and electronic equipment. The casing of this application embodiment includes: a housing body; a primer layer disposed on a surface of the case body, the primer layer including first particles dispersed therein, the first particles being micron-sized particles; the coating layer is arranged on the surface of the priming paint layer, which deviates from the shell body, and has light reflection performance, and the first particles are matched with the coating layer to enable the coating layer to be far away from the surface of the priming paint layer to form a plurality of bulges. The shell of the application embodiment has a matte granular visual effect, and is simple and convenient in preparation process and low in cost.

Description

Shell, preparation method thereof and electronic equipment

Technical Field

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

Background

With the development of technology and the improvement of living standard, people put higher demands on the appearance visual effect of electronic equipment. The visual effect of electronic equipment is directly influenced by the casing of electronic equipment, and the casing that has the matte sense, the sand grain sense can make electronic equipment seem more low-profile, have feel, however, the present preparation cost of the casing that has the matte sense, the sand grain sense is higher, consequently, uses mostly to be limited to in the high-end product of electronic equipment, is difficult to be applied to low-end product.

Disclosure of Invention

In view of the above problems, an embodiment of the present application provides a housing, which has a matte granular visual effect, and is simple and convenient in preparation process and low in cost.

The embodiment of the application provides a casing, it includes:

a housing body;

a primer layer disposed on a surface of the case body, the primer layer including first particles dispersed therein, the first particles being micron-sized particles; and

the coating layer is arranged on the surface of the priming paint layer, which deviates from the shell body, the coating layer has light reflection performance, and the first particles are matched with the coating layer to enable the coating layer to be far away from the surface of the priming paint layer to form a plurality of bulges.

In addition, the embodiment of the application also provides a preparation method of the shell, which comprises the following steps:

providing a shell body;

forming a primer layer on the surface of the shell body, wherein the first particles are dispersed in the primer layer and are micron-sized particles; and

and forming a coating layer on the surface of the primer layer, which is far away from the shell body, so that the first particles are matched with the coating layer, and forming a plurality of bulges on the surface of the coating layer, which is far away from the primer layer.

In addition, an embodiment of the present application provides an electronic device, which includes:

a display component;

the shell is used for bearing the display assembly; and

and the circuit board assembly is electrically connected with the display assembly and is used for controlling the display assembly to display.

The casing of this application embodiment is including range upon range of casing body, priming paint layer and the coating film layer that sets up in proper order, and when the surface on the coating film layer of casing was incided to light, because the reflection of light effect on coating film layer, light is reflected on coating film layer surface to make the casing have better gloss. Meanwhile, the first particles are matched with the coating layer, so that a plurality of bulges are formed on the surface of the coating layer away from the primer layer; thereby enabling the shell to show a matte granular visual effect. Therefore, the shell provided by the embodiment of the application has the advantages of good gloss, a matte granular visual effect, simple preparation process and low preparation cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a housing according to an embodiment of the present application.

Fig. 2 is a partial sectional structural view of the housing of an embodiment of the present application along a-a in fig. 1.

Fig. 3 is a partial sectional structural view of a housing according to another embodiment of the present application along a-a direction in fig. 1.

Fig. 4 is a partial sectional structural view of the housing of an embodiment of the present application along a-a in fig. 1.

Fig. 5 is a partial sectional view of a housing according to another embodiment of the present application, taken along the direction a-a in fig. 1.

Fig. 6 is a schematic flow chart of a method for manufacturing a housing according to an embodiment of the present disclosure.

Fig. 7 is a schematic flow chart of a method for preparing a primer layer of a housing according to an embodiment of the present disclosure.

Fig. 8 is a schematic flow chart of a method for manufacturing a housing according to another embodiment of the present application.

Fig. 9 is a diagram of a gold phase of the case of example 2 of the present application, which is enlarged by 50 times.

Fig. 10 is a diagram of a gold phase of the case of example 2 of the present application, which is enlarged by 100 times.

Fig. 11 is a diagram of a gold phase of the case of comparative example 1 of the present application, enlarged by 50 times.

Fig. 12 is a diagram of a gold phase of the case of comparative example 1 of the present application, magnified 100 times.

Fig. 13 is an external view of the housings obtained in examples 1 to 4 and comparative example 1 of the present application.

Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 15 is a schematic diagram of a partially exploded structure of an electronic device according to an embodiment of the present application.

Fig. 16 is a circuit block diagram of an electronic device according to an embodiment of the present application.

Description of reference numerals:

100-shell, 10-shell body, 30-primer layer, 31-first sub-primer layer, 33-second sub-primer layer, 50-coating layer, 51-bulge, 60-color paint layer, 70-finish paint layer, 400-electronic equipment, 410-display component, 420-rear cover, 421-light-transmitting part, 430-circuit board component, 431-processor, 433-memory and 450-camera module.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.

The plastic shell has simple and convenient preparation process and low preparation cost, is difficult to be applied to low-end mobile phones due to low glossiness and poor appearance effect.

The surface of the plastic shell is plated with the metal coating layer to improve the visible light reflectivity of the plastic shell, so that the plastic shell has metal luster.

The embodiment of the present application provides a housing 100, and the housing 100 of the present application may be applied to portable electronic devices such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, an intelligent bracelet, an intelligent watch, an electronic reader, and a game machine. The housing 100 of the embodiment of the present application may have a 2D structure, a 2.5D structure, a 3D structure, or the like. The case 100 of the present application may be a middle frame, a rear cover (battery cover), a decoration, etc. of an electronic device. In the following embodiments of the present application, the housing 100 is described in detail by taking a middle frame of a mobile phone as an example.

Referring to fig. 1 and 2, a housing 100 provided in an embodiment of the present disclosure includes a housing body 10, a primer layer 30, and a coating layer 50. The primer layer 30 is disposed on the surface of the case body 10, the primer layer 30 includes first particles, the first particles are dispersed in the primer layer 30, and the first particles are micron-sized particles; the coating layer 50 is arranged on the surface of the primer layer 30, which is far away from the shell body 10, the coating layer 50 has light reflection performance, and the first particles are matched with the coating layer 50, so that a plurality of protrusions 51 are formed on the surface of the coating layer 50, which is far away from the primer layer 30.

The primer layer 30 is disposed on the surface of the case body 10, and the primer layer 30 is disposed on one surface or multiple surfaces of the case body 10; it is also possible that the primer layer 30 is provided on a partial surface or the entire surface of one surface of the case body 10.

The first particles may be dispersed in primer layer 30 by first particles dispersed in a portion of primer layer 30, such as the surface of primer layer 30 facing coating layer 50, or by first particles dispersed in a portion of primer layer 30 adjacent coating layer 50; it is also possible that the first particles are dispersed throughout the primer layer 30, in other words, the first particles are dispersed throughout the primer layer 30.

The first particles are micron-sized particles, which means that the average particle diameter of the first particles is a micron-sized size. The protrusions are micron-sized particles.

The casing 100 of this application embodiment is including the casing body 10, priming paint layer 30 and the coating film layer 50 that stack gradually the setting, and when light incided to the surface of the coating film layer 50 of casing 100, because the reflection of light effect on coating film layer 50, light is reflected at coating film layer 50 surface to make casing 100 have better gloss. Meanwhile, the first particles are matched with the coating layer 50, so that a plurality of protrusions 51 are formed on the surface of the coating layer 50 away from the primer layer 30; thereby causing the housing 100 to reveal a matte, grainy visual effect. Therefore, the shell 100 of the embodiment of the application has good gloss and a matte granular visual effect, and is simple in preparation process and low in preparation cost.

Alternatively, the housing body 10 is a non-metal housing 100, and the non-metal housing 100 may include at least one of Polycarbonate (PC), polymethyl methacrylate (PMMA), Polyethylene terephthalate (PET), Glass Fiber (GF), Acrylonitrile Butadiene Styrene (ABS), and the like. When the housing body 10 includes a plurality of Polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate, glass fiber, and Acrylonitrile Butadiene Styrene (ABS), any two or more composite sheets may be used, for example, a composite sheet of polycarbonate and acrylonitrile butadiene styrene, a composite sheet of polycarbonate and glass fiber; or a sheet formed by the copolymerization of any two or more of them. It is understood that at least one means greater than or equal to one. The term "at least one" in the present application means more than one, or one or more than one. The "plurality" of the present application is two or more, or two or more.

Referring to fig. 3, in some embodiments, the primer layer 30 includes a first sub-primer layer 31 and a second sub-primer layer 33 which are stacked, and the first sub-primer layer 31 is disposed closer to the case body 10 than the second sub-primer layer 33. The first sub-primer layer 31 serves to shield defects on the surface of the case body 10 so that the resulting case assembly 100 has a better appearance, and the first sub-primer layer 31 also serves to improve the adhesion of the second sub-primer layer 33 on the first sub-primer layer 31. The second sub-primer layer 33 serves to shield defects on the surface of the first sub-primer layer 31 and also to improve the adhesion of the coating layer 50 on the second sub-primer layer 33.

Optionally, the hardness of the second sub-primer layer 33 is greater than that of the first sub-primer layer 31. The crosslinking degree of the second sub-primer layer 33 is greater than the crosslinking degree of the first sub-primer layer 31. The first sub-primer layer 31 may well bite the case body 10, and has good adhesion on the case body 10, so that adhesion of the second sub-primer layer 33 on the case body 10 may be improved. The first sub-primer layer 31 has good adhesion, a large molecular weight, low shrinkage, high elasticity, boiling resistance, and the like. The second sub-primer layer 33 is used to provide a certain hardness and plating property to the case 100 to improve the adhesion of the plated film layer 50 on the second sub-primer layer 33. The second sub-primer layer 33 has good adhesion, low shrinkage, high elasticity, boiling resistance, plating resistance, and the like.

Optionally, the first particles are dispersed in at least one of the first sub-primer layer 31 and the second sub-primer layer 33, so that the first particles cooperate with the coating layer 50 to form a plurality of protrusions 51 on the surface of the coating layer 50 away from the second sub-primer layer 33. After the coating layer 50 is formed, particles which are convex micron-sized and have a reflection effect on light rays are formed on the surface of the coating layer 50, so that the matte granular appearance effect is exposed on one side of the coating layer 50 of the shell 100, which is far away from the shell body 10.

In some embodiments, the first particles are dispersed in the first sub-primer layer 31, and the average particle size of the first particles is greater than or equal to the thickness of the primer layer 30, so that the first particles cooperate with the coating layer 50 to form a plurality of protrusions 51 on the surface of the coating layer 50 away from the second sub-primer layer 33. In other words, the first sub-primer layer 31 includes first particles having an average particle diameter greater than or equal to the sum of the total thicknesses of the first and second

sub-primer layers

31 and 33.

It should be noted that, the first particles are particles with an average particle size of micron order, and actually, the particle sizes of the first particles cannot be completely equal, and include particles with particle sizes equal to, larger than, and smaller than the average particle size, so when the average particle size of the first particles is equal to the thickness of the primer layer 30, at least a portion of the particle sizes of the first particles is larger than the thickness of the primer layer 30, and therefore, at least a portion of the first particles protrudes from the side of the second sub-primer layer 33 away from the first sub-primer layer 31. The thicknesses of the present application are, as not particularly specified, all to the thicknesses in the stacking direction of the case body 10, the primer layer 30, and the plating layer 50.

In other embodiments, the first particles are dispersed in the second sub-primer layer 33 or in the first sub-primer layer 31 and the second sub-primer layer 33 (in other words, when the first particles are dispersed in both the first sub-primer layer 31 and the second sub-primer layer 33), and the average particle size of the first particles is greater than or equal to the thickness of the second sub-primer layer 33, so that the first particles cooperate with the coating layer 50 to form a plurality of protrusions 51 on the surface of the coating layer 50 away from the second sub-primer layer 33. In other words, each of the first and second

sub-primer layers

31 and 33 includes first particles; alternatively, the second sub-primer layer 33 includes first particles; the first particles have an average particle diameter greater than or equal to the thickness of the second sub-primer layer 33.

In some embodiments, the mass fraction of the first particles in the primer layer 30 including the first particles ranges from 1.5% to 5%. Specifically, in the primer layer 30 including the first particles, the mass fraction of the first particles may be, but is not limited to, 1.5%, 1.8%, 2.0%, 2.2%, 2.5%, 2.8%, 3.0%, 3.3%, 3.5%, 3.8%, 4.0%, 4.2%, 4.5%, 4.8%, 5%, etc. The more the first particles are added, the stronger the graininess of the produced shell 100, but the more the first particles are added, the lower the adhesion performance of the primer layer 30. If the amount of the first particles added is less than 1.5%, the adhesion property of the primer layer 30 is good, but the graininess of the formed shell 100 is weak. Therefore, when the mass fraction of the first particles is 1.5% to 5%, the primer layer 30 has a good adhesion property as well as a strong granular feeling to the shell 100.

The percentages and parts in the present application refer to mass fraction and mass parts unless otherwise specified. In the embodiments of the present application, when referring to the numerical ranges a to b, if not specifically indicated, the end value a is included, and the end value b is included. For example, a mass fraction of the first particles in a range of 1.5% to 5% means that the mass fraction of the first particles may be any value between 1.5% to 5%, inclusive of the endpoints 1.5% and 5%.

In some embodiments, when the first sub-primer layer 31 includes the first particles, the weight of the first particles is 1.5% to 5% of the weight of the first sub-primer layer 31. In still other embodiments, when the second sub-primer layer 33 includes the first particles, the weight of the first particles is 1.5% to 5% of the weight of the second sub-primer layer 33. In still other embodiments, each of the first and second

sub-primer layers

31 and 33 includes first particles in an amount of 1.5% to 5% by weight of the total weight of the first and second

sub-primer layers

31 and 33.

Optionally, the first particles comprise one or more of nylon particles, glass particles, polymethacrylate particles (acrylic particles), silica particles, titanium dioxide particles, or the like. These particles have good dispersibility in the primer layer 30, and do not affect the adhesion of the primer layer 30 on the case body 10. Thus, using these particles as the first particles allows the resulting shell 100 to have a visual effect of metal blasting-like particles with a more uniform distribution of particles on the primer layer 30 without affecting the adhesion of the primer layer 30 to the shell body 10.

Alternatively, the first particles have an average particle diameter r1 in the range of 3 μm or more and r1 or more and 10 μm or less. Specifically, r1 can range from, but is not limited to, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm. When the particle size of the first particles is too small, the graininess of the formed shell 100 is weak, and if the shell 100 has the graininess, the thickness of the primer layer 30 needs to be very thin, and if the primer layer 30 is too thin, the hiding property is poor, and the yield is low. If the particle size of the first particles is too large, the dispersibility of the first particles in the primer layer 30 is poor, the first particles are not uniformly distributed, the light shadow of the reflective particles is dark, and the visual effect is affected, in addition, if the particle size of the first particles is too large (for example, greater than 10 μm), when the paint of the first sub-primer layer and the paint of the second sub-primer layer are filtered, a filter sieve with larger sieve holes needs to be selected, and many small particles of impurities still permeate the sieve holes after filtering, so that more impurities remain in the paint, and the appearance defect is easily caused, if the particle size of the first particles is too small (for example, less than 3 μm), the cost of the first particles is increased, and the particle size is too small, which may be difficult to realize in the process. Further, the range of the average particle diameter r1 of the first particles is 4 [ mu ] m or more and r1 or more and 7 [ mu ] m or less.

In some embodiments, the first sub-primer layer 31 is formed by photocuring the first primer. The first primer comprises a first resin, a first photoinitiator, an auxiliary agent and a solvent. The first resin includes one or more of a solvent-type acrylic resin (having a solid content of 50% to 70%), a difunctional urethane resin, and the like. The first photoinitiator comprises 1-hydroxycyclohexylphenylketone (1-hydroxycyclohexyl phenyl ketone, photoinitiator 184), Diphenyl- (2,4,6-Trimethylbenzoyl) oxyphosphorus (Diphenyl (2,4,6-Trimethylbenzoyl) Phosphine Oxide (TPO), Benzophenone (Benzophenone, BP), propylthioxanthone (ITX), 2, 4-Diethylthioxanthone (DETX), 2-hydroxy-2-methyl-1-phenylpropanone (photoinitiator 1173), photoinitiator 1000(20 wt% of 1-hydroxycyclohexylphenylketone and 80 wt% of 2-methyl-2-hydroxy-1-phenyl-1-propanone), photoinitiator 1300(30 wt% of photoinitiator 369 and 70 wt% of photoinitiator 651 (dimethylbenzoyl, DMPA)), photoinitiator 1700(25 wt% of photoinitiator BAPO (also called 819) and 75 wt% of photoinitiator 1173) One or more of photoinitiator 500(50 wt% photoinitiator 1173 and 50 wt% BP), and the like. In this embodiment, the auxiliary agent includes one or more of silicon dioxide and silicone resin. In this embodiment, the additive is used to improve the covering power and leveling property of the first primer, and to improve the wettability and anti-cratering property of the first primer to the housing body 10. In this embodiment, the solvent includes one or more of toluene, butyl acetate, ethyl acetate, and cyclohexanone, and the solvent is used to dissolve the first resin, thereby improving the workability and viscosity of the first primer. In a specific embodiment, the first primer comprises the following components in parts by weight: 5 to 15 parts of solvent type acrylic resin, 20 to 30 parts of difunctional polyurethane resin, 1841 to 5 parts of photoinitiator, 0.1 to 2 parts of TPO, 0.1 to 2 parts of organic silicon resin, 1 to 5 parts of silicon dioxide, 15 to 25 parts of toluene, 15 to 25 parts of butyl acetate, 15 to 25 parts of ethyl acetate and 5 to 15 parts of cyclohexanone.

Optionally, when the first sub-primer layer 31 includes the first particles, the first particles are also included in the first primer. Alternatively, the first particles may be dispersed in a solvent to form a slurry and then added to the first primer, for example, when the first particles are silica particles, the silica particles may be dispersed in xylene to form a dummy slurry (wherein the mass concentration of silica may be 10% to 15%), and then the dummy slurry is added to the first primer.

Optionally, the thickness d11 of the first sub-primer layer 31 ranges from: d11 is more than or equal to 2 mu m and less than or equal to 4 mu m; specifically, d11 can range from, but is not limited to, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, and the like. If the first sub-primer layer 31 is too thin (e.g., less than 2 μm), the first sub-primer layer 31 has poor coverage and low yield. The first sub-primer layer 31 is too thick (e.g., greater than 4 μm), and the edge portions are prone to oil accumulation when the primer is sprayed.

In some embodiments, the second sub-primer layer 33 is formed by photocuring the second primer. The second primer comprises a second resin, a second photoinitiator, a monomer, an auxiliary agent and a solvent. The second resin includes one or more of solvent-type acrylic resin (having a solid content of 50% to 70%), difunctional urethane acrylate resin, trifunctional urethane acrylic resin, and the like. The monomer can be one or more of trimethylolpropane triacrylate (TMPTA) and dipentaerythritol hexaacrylate (DPHA). The second photoinitiator includes one or more of photoinitiator 184, TPO, BP, ITX, DETX, photoinitiator 1173, photoinitiator 1000, photoinitiator 1300, photoinitiator 1700, photoinitiator 500, and the like. In this embodiment, the auxiliary agent includes one or more of silicon dioxide and silicone resin. In this embodiment, the additive is used to improve the leveling property and the anti-cratering property of the second primer. In this embodiment, the solvent includes one or more of toluene, ethyl acetate, diacetone alcohol, and methyl isobutyl ketone, and the solvent is used to dissolve the second resin, thereby improving the workability and viscosity of the second primer. In a specific embodiment, the second primer comprises the following components in parts by weight: 5 to 10 parts of solvent type acrylic resin, 15 to 25 parts of difunctional urethane acrylate resin, 5 to 10 parts of trifunctional urethane acrylic resin, 5 to 15 parts of trimethylolpropane triacrylate, 1841 to 5 parts of photoinitiator, 0.1 to 2 parts of organic silicon resin, 15 to 25 parts of toluene, 15 to 25 parts of butyl acetate, 5 to 15 parts of diacetone alcohol and 5 to 15 parts of methyl isobutyl ketone. In one embodiment, when the first resin and the second resin are both acrylate type resins, compatibility between the first sub-primer layer 31 and the second sub-primer layer 33 may be improved, thereby improving adhesion of the second sub-primer layer 33 on the first sub-primer layer 31.

In some embodiments, when the second sub-primer layer 33 includes the first particles, the first particles are also included in the second primer. Alternatively, the first particles may be dispersed in a solvent to form a slurry, and then added to the second primer, for example, when the first particles are silica particles, the silica particles may be dispersed in xylene to form a dummy slurry (wherein the mass concentration of silica may be 10% to 15%), and then the dummy slurry is added to the second primer.

Optionally, the thickness d12 of the second sub-primer layer 33 ranges from: d12 is more than or equal to 3 mu m and less than or equal to 7 mu m; specifically, d12 can range from, but is not limited to, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, and the like. If the second sub-primer layer 33 is too thin (e.g., less than 3 μm), the second sub-primer layer 33 has poor hiding, low yield, and poor adhesion. The second sub-primer layer 33 is too thick (e.g., greater than 7 μm) and tends to accumulate oil at the edge locations when the primer is sprayed.

The metal has good glossiness, however, after the metal is formed, the surface has more burrs and defects, the metal cannot be directly applied to a shell of an electronic device, such as a middle frame, when the metal is applied to the electronic device, the metal plate needs to be polished, or the surface of the metal plate needs to be sandblasted and anodized to form a protective film, so that the metal plate has a matte effect with a sand grain feeling (or a granular feeling). The metal polishing can form mirror reflection and has good glossiness, however, the polished metal surface is obvious as long as a little defect exists, and a defective product is formed, so that the yield is low, the polishing cost is high, the light reflection rate is too high, and the visual effect and the experience are weak. Therefore, when the metal is applied to the shell of the electronic equipment, sand blasting and anodic oxidation are generally adopted, so that the metal has metal luster and sand grain feel, and the reflection rate of the metal surface subjected to sand blasting and anodic oxidation is lower than that of the polished metal surface, so that the prepared shell looks lower and has better texture and visual effect, and is more suitable for being applied to high-end electronic equipment products. However, the overall cost of the metal housing is high, and it is difficult to widely apply the metal housing to middle and low-end electronic devices. In addition, the metal shell is easy to affect the communication signal of the electronic device, in order not to affect the communication signal of the electronic device, a hole can be formed in the metal shell at the position of the antenna, and then nano injection molding (T treatment or metal surface treatment) is performed to control the material which does not affect the antenna signal, so that a plurality of parts (e in fig. 13) different from the material and the color of the metal shell often appear on the middle frame of the manufactured shell, and the appearance effect of the shell is directly affected.

In some embodiments, the coating 50 is a metal coating, and the coating 50 includes one or more of indium, tin, an alloy containing indium, an alloy containing tin, an alloy containing indium and tin, or the like. The plating layer 50 may be prepared by using a Non-conductive plating technique (also called Non-continuous vacuum plating, NCVM) using a target including one or more elements of indium, tin, and the like. The coating 50 may provide a metallic luster to the shell 100, and the coating 50 cooperates with the first particles to provide a metal-like visual appearance to the shell 100. Therefore, the shell has the appearance effect similar to metal sand blasting anodic oxidation, and the preparation process is simpler than the metal sand blasting anodic oxidation and the preparation cost is lower. The NCVM technology can make the plastic plate have a metallized appearance, and the coating layer 50 is an insulating structure (the coating layer 50 is thin and has high resistivity), has high resistivity (for example, up to 109 Ω. M), does not attenuate any high-frequency signal, can effectively ensure transmission and reception of communication signals when the housing 100 is applied to an electronic device, and can make the housing have a metal coating mirror effect (i.e., metallic luster) and rich colors by the metal coating layer 50.

Optionally, the visible light transmittance T of the plated film layer 50 ranges from: t is more than or equal to 7 percent and less than or equal to 13 percent; specifically, it may be, but not limited to, 7%, 8%, 9%, 10%, 11%, 12%, 13%, etc. The visible light reflectivity range of the coating layer 50 is as follows: r is more than or equal to 75 percent and less than or equal to 90 percent; specifically, it may be, but is not limited to, 75%, 78%, 80%, 83%, 85%, 88%, 90%, etc. The visible light transmittance and reflectance of the coating layer 50 can be controlled by the material of the coating layer 50 and the process conditions during coating to control the compactness of the formed coating layer 50, so that the visible light transmittance T of the formed coating layer 50 is in the range of: t is more than or equal to 7 percent and less than or equal to 13 percent; the range of visible light reflectance is: r is more than or equal to 75 percent and less than or equal to 90 percent.

Optionally, the thickness d2 of the coating layer 50 ranges from: d2 is more than or equal to 40nm and less than or equal to 80 nm; specifically, it may be, but not limited to, 40nm, 45nm, 50nm, 55nm, 60nm, 65nm, 70nm, 75nm, 80 nm. Alternatively, the number of the coating layers 50 may be one layer, or may be a plurality of layers stacked. If the coating layer 50 is too thin (e.g., less than 40nm), the reflectivity of the formed coating layer 50 is insufficient, which reduces the metallic luster of the surface of the formed housing 100, and if the thickness of the coating layer 50 is too thick (e.g., greater than 80nm), the conductivity of the coating layer 50 increases, which affects the signal of the electronic device using the housing 100.

Referring to fig. 4, the housing 100 of the embodiment of the present application further includes a color paint layer 60, and the color paint layer 60 is disposed on a surface of the film coating layer 50 away from the primer layer 30, for exposing a color of the housing 100.

In some embodiments, the pigmented paint layer is transparent or translucent. The colored paint layer 60 is formed by photocuring a colored paint. The colored paint comprises third resin, a third photoinitiator, nano color paste, an auxiliary agent and a solvent. The third resin includes one or more of a solvent-type acrylic resin (having a solid content of 40% to 60%), a difunctional urethane acrylic resin, and the like. The third photoinitiator includes one or more of photoinitiator 184, TPO, BP, ITX, DETX, photoinitiator 1173, photoinitiator 1000, photoinitiator 1300, photoinitiator 1700, photoinitiator 500, and the like. In this embodiment, the auxiliary agent may be, but is not limited to, a silicone resin. In this embodiment, the solvent includes one or more of toluene, ethyl acetate, propylene glycol methyl ether acetate, cyclohexanone, and ethylene glycol butyl ether, and the solvent is used to dissolve the third resin, thereby improving the workability and viscosity of the colored paint. The color of the nanometer color paste can be, but is not limited to, red, orange, yellow, green, blue, pink, purple, gray and the like. In a specific embodiment, the colored paint comprises the following components in parts by weight: 20 to 30 parts of solvent type acrylic resin, 5 to 10 parts of difunctional polyurethane acrylic resin, 1840.1 to 3 parts of photoinitiator, 0.1 to 3 parts of TPO, 0.1 to 2 parts of organic silicon resin, 15 to 25 parts of toluene, 25 to 35 parts of butyl acetate, 2 to 10 parts of propylene glycol methyl ether acetate, 5 to 15 parts of cyclohexanone, 2 to 10 parts of ethylene glycol butyl ether and 1 to 5 parts of nano color paste.

Optionally, the thickness d3 of the color lacquer layer 60 ranges from: d3 is more than or equal to 4 mu m and less than or equal to 8 mu m; specifically, it may be, but not limited to, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, or the like. When the thickness of the colored paint layer 60 is less than 4 μm, it is difficult to achieve a desired color effect, and when the thickness of the colored paint layer 60 is more than 8 μm, it is difficult to completely cure, so that the adhesion of the colored paint layer 60 is deteriorated. When the thickness of the colored paint layer 60 is 4 μm to 8 μm, the colored paint layer 60 can be cured completely and has good adhesion performance, and the colored paint layer 60 has good color effect.

Referring to fig. 5, the housing 100 of the embodiment of the present application further includes a finishing paint layer 70. The top coat layer 70 is disposed on a side of the coating layer 50 away from the primer layer 30, and is used for making the housing 100 have better weather resistance, excellent scratch resistance and wear resistance.

The surface paint layer 70 is arranged on the side of the coating layer 50 departing from the primer layer 30, so that the surface paint layer 70 is directly arranged on the surface of the coating layer 50 departing from the primer layer 30; other film layers may be further included between the topcoat layer 70 and the coating layer 50, the topcoat layer 70 is disposed on the surface of the film layer, for example, the topcoat layer 70 is disposed on the surface of the colored paint layer 60 away from the coating layer 50.

Optionally, topcoat layer 70 is formed from a topcoat that is photocured. The finish paint comprises fourth resin, a fourth photoinitiator, an auxiliary agent and a solvent. The fourth resin comprises one or more of solvent type acrylic resin (the solid content of which is 50-70%), trifunctional polyurethane acrylic resin, hexafunctional polyurethane acrylate resin, fluorine-silicon polymer and the like. The fourth photoinitiator includes one or more of photoinitiator 184, TPO, BP, ITX, DETX, photoinitiator 1173, photoinitiator 1000, photoinitiator 1300, photoinitiator 1700, photoinitiator 500, and the like. In this embodiment, the auxiliary agent may be, but is not limited to, a silicone resin. In this embodiment, the solvent includes one or more of toluene, ethyl acetate, and butyl acetate, and the solvent is used to dissolve the fourth resin, so as to improve the workability and viscosity of the finish paint. In a specific embodiment, the finish paint comprises the following components in parts by weight: 5 to 15 parts of solvent type acrylic resin, 5 to 10 parts of trifunctional polyurethane acrylic resin, 10 to 20 parts of hexafunctional polyurethane acrylate resin, 5 to 15 parts of fluorosilicone polymer, 1840.1 to 2 parts of photoinitiator, 0.1 to 2 parts of TPO, 0.1 to 1 part of organic silicon resin, 10 to 20 parts of toluene, 20 to 30 parts of ethyl acetate and 20 to 30 parts of butyl acetate.

The topcoat layer 70 of the embodiment of the present application has excellent adhesion, high toughness, good weather resistance, and excellent scratch and wear resistance. The pencil hardness of the surface paint layer 70 of the shell 100 in the embodiment of the application can be up to 1H, and the pencil hardness test in the embodiment of the application adopts GB/T6739-.

In some embodiments, the topcoat layer 70 further comprises second particles dispersed in the topcoat layer 70, the second particles having a refractive index different from the refractive index of the topcoat layer 70. When the coating layer 50 is disposed on the housing body 10, the housing 100 can have metallic luster and texture, but the mirror reflection of the coating layer 50 is strong, if the housing 100 needs to have a matte effect of sandblasting, the overall brightness of the housing 100 needs to be further reduced, second particles with a refractive index different from that of the top paint layer 70 are added in the top paint layer 70, light reflected back to the top paint layer 70 by the coating layer 50 can be scattered or diffusely reflected, so that the brightness of the whole housing 100 is reduced, and the granular feel and brightness of the housing 100 have an appearance effect closer to that of the metal sandblasting anodized. When the topcoat layer 70 further includes second particles, the topcoat further includes second particles.

Optionally, in the topcoat layer 70, the mass fraction of the second particles is 4% to 21%; in other words, in the topcoat layer 70, the weight of the second particles is 4% to 21% of the total weight of the topcoat layer 70; specifically, it may be, but not limited to, 4%, 6%, 8%, 10%, 12%, 16%, 18%, 20%, 21%, etc. The larger the amount of the second particles added in the top coat layer 70, the lower the glossiness of the prepared shell 100, and when the mass fraction of the second particles is 4% to 21%, the glossiness of the prepared shell 100 and the prepared shell by metal blasting anodic oxidation can be closer, and the top coat layer 70 has better adhesion performance. When the mass fraction of the second particles is less than 4%, the light scattering effect of the topcoat layer 70 is weak, and the metallic luster of the prepared shell 100 is bright, and when the mass fraction of the second particles is greater than 21%, the adhesion property of the topcoat layer 70 is affected, and the metallic luster of the prepared shell 100 is dark.

Optionally, the second particles are matting particles, the second particles include one or more of silica particles, nylon particles or titanium dioxide particles, and the refractive index of the second particles is different from that of the topcoat layer 70, so that a scattering or diffuse reflection effect can be better formed in the topcoat layer 70 after the second particles are added, and the shell 100 has a sandblasted matte appearance effect.

Optionally, the second particles have an average particle size r2 in the range of 3 μm or less r2 or less 10 μm; specifically, r1 can range from, but is not limited to, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, and the like. The particle size of the second particles is larger than 10 μm, when the paint of the finish paint layer is filtered, a filter sieve with larger sieve pores needs to be selected, and more impurities of small particles still permeate the sieve pores after filtering, so that more impurities remain in the paint, which easily causes appearance defects, and the particles of the second particles are too small (if smaller than 10 μm), so that the scattering or diffuse reflection effect of the finish paint layer 70 is poor, the cost of the second particles is increased, and the particle size is too small, which may be difficult to realize technically.

Optionally, the thickness d4 of the finishing paint layer 70 is in the range of 14 μm & lt d4 & lt 20 μm; specifically, it may be, but not limited to, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, or the like. If the thickness of the topcoat layer 70 is too thin (e.g., less than 14 μm), the wear resistance of the topcoat layer 70 is reduced, and if the thickness of the topcoat layer 70 is too thick (e.g., greater than 20 μm), oil is easily accumulated at the edge position during spraying, and the assembly process with high hardness is easily cracked.

The housing 100 of the embodiment of the present application may be prepared by a method described in the following embodiment of the present application, and may be prepared by other methods, and the preparation method of the embodiment of the present application is only one preparation method of the housing 100 of the present application, and should not be construed as limiting the housing 100 provided in the embodiment of the present application.

Referring to fig. 6, an embodiment of the present application further provides a method for manufacturing the housing 100, which includes:

s201, providing a shell body 10;

for a detailed description of the housing body 10, reference is made to the above embodiments, which are not repeated herein.

S202, forming a primer layer 30 on the surface of the case body 10, wherein the primer layer 30 is dispersed with first particles; and

referring to fig. 7, optionally, the primer layer 30 includes a first sub-primer layer 31 and a second sub-primer layer 33 which are sequentially stacked. The first sub-primer layer 31 is disposed closer to the case body 10 than the second sub-primer layer 33, and forming the primer layer 30 on the surface of the case body 10 includes:

s2021, spraying a first primer on the surface of the housing body 10;

optionally, the first primer is diluted by a diluent (for example, diluted by a weight ratio of the first primer to the diluent of 10: 1), so that the viscosity of the diluted first primer is 8.7S to 9.3S (viscosity at 25 ℃), spraying is performed by 8 spray guns, the first primer is sprayed on the surface of the housing body 10, the linear speed of the housing body 10 is 7m/min when spraying is performed, and after spraying, baking is performed for 5min to 10min by infrared rays at 55 ℃ to 65 ℃ to remove the solvent and the diluent, so as to form a first primer glue layer.

In the present embodiment, the spray coating can be applied to the surface of the object to be coated by dispersing into uniform and fine droplets by means of a spray gun or a disc atomizer by means of pressure or centrifugal force. The spraying can be classified into air spraying, airless spraying, electrostatic spraying, and the like, such as large-flow low-pressure atomized spraying, thermal spraying, automatic spraying, multi-group spraying, and the like.

Optionally, the diluent comprises one or more of isopropanol, isobutanol, diacetone alcohol, and the like. In this example, the diluent comprises the following components in parts by weight: 10% isopropanol, 10% isobutanol, 80% diacetone alcohol.

In a specific embodiment, when the first primer includes first particles, and the first particles are silica particles, the silica particles are dispersed in toluene to form a dummy slurry, wherein the mass concentration of silica in the dummy slurry may be 10% to 15%, before spraying, the first primer, the diluent and the dummy slurry are diluted according to a weight ratio of 100:10 (5 to 8), and then spraying is performed, so that at least a portion of the first particles protrude from a side of the second sub-primer layer 33 away from the shell body 10.

For a detailed description of the first primer and the first sub-primer layer 31, please refer to the description of the corresponding parts of the above embodiments, which is not repeated herein.

S2022, spraying a second primer on the surface of the first primer, wherein first particles are dispersed in at least one of the first primer and the second primer; and

optionally, the second primer is diluted by a diluent (for example, diluted by a weight ratio of the second primer to the diluent of 10: 1), so that the viscosity of the diluted second primer is 8.4S to 8.8S (viscosity at 25 ℃), spraying is performed by using 16 spray guns, the second primer is sprayed on the surface of the first primer glue layer, the conveying linear speed is 7m/min when spraying is performed, and after spraying, baking is performed for 5min to 10min by infrared rays at 55 ℃ to 65 ℃ to remove the solvent and the diluent, so as to form the second primer glue layer.

In a specific embodiment, when the second primer includes first particles, and the first particles are silica particles, the silica particles are dispersed in toluene to form a dummy slurry, wherein the mass concentration of silica in the dummy slurry may be 10% to 15%, before spraying, the second primer, the diluent and the dummy slurry are diluted according to a weight ratio of 100:10 (5 to 8), and then spraying is performed, so that at least a portion of the first particles protrude from a side of the second sub-primer layer 33 away from the shell body 10.

For a detailed description of the second primer, the second sub-primer layer 33, and the first particles, reference is made to the description of the corresponding parts of the above embodiments, which is not repeated herein.

S2023, subjecting the first primer and the second primer to light intensity of 80mw/cm²To 200mw/cm²Curing energy 500mj/cm²To 600mj/cm²Then, photo-curing is performed, so that the first primer forms the first sub-primer layer 31 and the second primer forms the second sub-primer layer 33.

Optionally, the light intensity of the curing of the first primer and the second primer can be, but is not limited toIs 80mw/cm²、100mw/cm²、120mw/cm²、140mw/cm²、160mw/cm²、180mw/cm²、200mw/cm²And the like. When the light intensity of curing is less than 80mw/cm²When the first primer and the second primer are not completely cured, the adhesion performance of the first sub-primer layer 31 and the second sub-primer layer 33 is affected, and when the cured light intensity is more than 200mw/cm²In this case, the life of the mercury lamp or LED lamp is reduced.

Alternatively, the curing energy of the first and second primers may be, but is not limited to, 500mj/cm²、520mj/cm²、540mj/cm²、560mj/cm²、580mj/cm²、600mj/cm²And the like. The higher the curing energy of the photocuring, the more complete the curing of the first primer and the second primer, but when the curing energy of the photocuring is too high (for example, more than 600 mj/cm)²) In this case, the degree of crosslinking of the second sub-primer layer 33 is too high, and the hardness is too high, which affects the adhesion of the coating layer 50 to the second sub-primer layer 33. If the curing energy is too low, the curing rate of the first sub-primer layer 31 and the second sub-primer layer 33 is low, which affects the adhesion performance of the first sub-primer layer 31 and the second sub-primer layer 33.

S203, forming a coating layer 50 on the surface of the primer layer 30, which is far away from the shell body 10, so that the first particles are matched with the coating layer 50, and forming a plurality of protrusions 51 on the surface of the coating layer 50, which is far away from the primer layer 30.

Optionally, a target material comprising one or more elements of indium, tin and the like is used as a target material, and a non-conductive electroplating technology is adopted to plate the coating layer 50 on the surface of the second sub-primer layer 33 away from the first sub-primer layer 31.

For a detailed description of the plated layer 50, reference is made to the description of the corresponding parts of the above embodiments, which are not repeated herein.

The shell 100 manufactured by the manufacturing method of the shell 100 in the embodiment of the application comprises the shell body 10, the primer layer 30 and the coating layer 50 which are sequentially stacked, and when light enters the surface of the coating layer 50 of the shell 100, the light is reflected on the surface of the coating layer 50 due to the light reflection effect of the coating layer 50, so that the shell 100 has better gloss. Meanwhile, the first particles are matched with the coating layer 50, so that a plurality of protrusions 51 are formed on the surface of the coating layer 50 away from the primer layer 30; thereby causing the housing 100 to reveal a matte, grainy visual effect. Therefore, the shell 100 of the embodiment of the application has good gloss and a matte granular visual effect, and is simple in preparation process and low in preparation cost.

For a detailed description of the same features of this embodiment as those of the above embodiment, please refer to the above embodiment, which is not repeated herein.

Referring to fig. 8, an embodiment of the present application further provides a method for manufacturing a housing 100, which includes:

s301, providing a shell body 10;

s302, spraying a first primer on the surface of the shell body 10;

s303, spraying a second primer on the surface of the first primer, wherein at least one of the first primer and the second primer is dispersed with first particles;

s304, photo-curing the first primer and the second primer to form the first primer layer 31 and the second primer layer 33;

s305, forming a coating layer 50 on the surface of the second sub-primer layer 33, which is far away from the first sub-primer layer 31, so that the first particles are matched with the coating layer 50, and forming a plurality of protrusions 51 on the surface of the coating layer 50, which is far away from the primer layer 30;

for detailed descriptions of steps S301 to S305, please refer to corresponding parts of the above embodiments, which are not described herein again.

S306, forming a colored paint layer 60 on the surface of the coating layer 50, which is far away from the second sub-primer layer 33; and

optionally, adjusting the color to viscosity of 7.9S to 8.5S (viscosity at 25 ℃), spraying with 8 spray guns, spraying color paint on the surface of the first primer glue layer, wherein the linear speed of the conveyor is 7m/min, after spraying, baking with infrared rays at 55 ℃ to 65 ℃ for 5min to 10min to remove the solvent and the diluent, and keeping the light intensity at 80mw/cm²To 200mw/cm²Curing energy 350mj/cm²To 500mj/cm²Then, carrying out photocuring to obtain a colored paint layer 60;

alternatively, the intensity of the cured color paint may be, but is not limited to, 80mw/cm²、100mw/cm²、120mw/cm²、140mw/cm²、160mw/cm²、180mw/cm²、200mw/cm²And the like. When the light intensity of curing is less than 80mw/cm²When the curing of the colored paint is incomplete, the adhesion performance of the colored paint layer 60 is influenced, and when the curing light intensity is more than 200mw/cm²In this case, the life of the mercury lamp or LED lamp is reduced.

Alternatively, the curing energy of the pigmented paint may be, but is not limited to, 350mj/cm²、380mj/cm²、400mj/cm²、420mj/cm²、450mj/cm²And the like. When the colored paint layer 60 is cured, the curing energy of the mercury lamp is not too high, and if the curing energy of the mercury lamp is too high, the crosslinking degree of the prepared colored paint layer 60 is too high, and the hardness is too high, so that the adhesive force of the finish paint layer 70 on the colored paint layer 60 is influenced.

For a detailed description of the colored paint and the colored paint layer 60, reference is made to the description of the corresponding parts of the above embodiments, which are not repeated herein.

And S307, forming a finish paint layer 70 on the surface of the colored paint layer 60, which is far away from the coating layer 50.

Optionally, diluting the finish paint by using a diluent (for example, diluting the finish paint according to the weight ratio of 10:1 of the finish paint to the diluent), so that the viscosity of the diluted finish paint is 7.9S to 8.5S (viscosity at 25 ℃), spraying by using 8 spray guns, spraying the finish paint on the surface of the colored paint layer 60, wherein the linear speed of a conveyor is 7m/min, and after spraying, baking for 5min to 10min by using infrared rays at 60 ℃ to 70 ℃ to remove the solvent and the diluent; at a light intensity of 80mw/cm²To 200mw/cm²Curing energy 800mj/cm²To 1000mj/cm²Then, photo-curing is performed to obtain the finish paint layer 70.

Alternatively, the light intensity of the finish curing may be, but is not limited to, 80mw/cm²、100mw/cm²、120mw/cm²、140mw/cm²、160mw/cm²、180mw/cm²、200mw/cm²And the like. When the light intensity of curing is less than 80mw/cm²When the curing intensity is more than 200mw/cm, the finish paint is not completely cured, which affects the adhesion property of the finish paint layer 70²In this case, the life of the mercury lamp or LED lamp is reduced.

Alternatively, the curing energy of the topcoat may be, but is not limited to, 800mj/cm²、850mj/cm²、900mj/cm²、950mj/cm²、1000mj/cm²And the like. Curing energy is less than 800mj/cm²The formed finishing paint layer 70 is soft and has poor wear resistance, and the curing energy is more than 1000mj/cm²The adhesion of the topcoat layer 70 is reduced and the assembly is easily cracked.

In a specific embodiment, the finishing paint comprises second particles, the second particles are silica particles, the silica particles are dispersed in toluene to form a matte slurry, wherein the mass concentration of silica in the matte slurry can be 10-15%, and before spraying, the finishing paint, the diluent and the matte slurry are diluted according to the weight ratio of 100:10 (25-45) and then sprayed.

For a detailed description of the top coat, the top coat layer 70 and the second particles, reference is made to the description of the corresponding parts of the above embodiments, which are not repeated herein.

The housing 100 of the embodiment of the present application is further described below with reference to specific embodiments.

Examples 1 to 5

The case 100 of each example was prepared by the following steps:

1) polycarbonate body (PC substrate);

2) spraying a first primer on the surface of the PC; the first primer used in the present example is a treating agent of Jiangsu Hongtai Polymer materials GmbH, model number S-803 and model number S-847;

3) spraying a second primer on the surface of the first primer, wherein the second primer comprises first particles, and the average particle size of the first particles is 6 microns; the second primer used in this example was a primer ZD-3D89-1 from Jiangsu Hongtai Polymer materials, Inc.;

4) at a light intensity of 100mw/cm²Curing energy 550mj/cm²Then, performing light curing to form a first sub-primer layer 31 and a second sub-primer layer 33, wherein the thickness of the first sub-primer layer 31 is 3 μm, and the thickness of the second sub-primer layer 33 is 5 μm;

5) plating an indium layer on the surface of the second sub-primer layer 33 away from the first sub-primer layer 31, wherein the thickness of the indium layer is 50 nm;

6) forming a color paint layer 60 on the surface of the indium layer, which is far away from the second sub-primer layer 33, wherein the thickness of the color paint layer 60 is 6 mu m, and the light intensity is 100mw/cm²Curing energy 400mj/cm²(ii) a The color paint used in the embodiment is a Chinese paint with the model number of ZD-203Z, manufactured by Jiangsu Hongtai Polymer materials GmbH; and

7) forming a finish paint layer 70 on the surface of the color paint layer 60, which is far away from the coating layer 50, wherein the finish paint comprises second particles, and the average particle size of the second particles is 6 microns; the thickness of the topcoat layer 70 was 15 μm and the light intensity was 100mw/cm²Curing energy of 900mj/cm²(ii) a The finish paint used in the present example was a finish paint of 3M407 type by the company of jiangsu Hongtai polymer materials, ltd.

The detailed parameters and performance parameters of the above examples are shown in table 1 below.

Comparative example 1

1) Providing an aluminum alloy substrate;

2) carrying out sand blasting on the surface of the aluminum alloy base material;

3) the case 100 is manufactured by performing anodic oxidation to form an oxide film on the surface of the aluminum alloy base material.

The above examples and comparative examples were subjected to various performance tests, and the test results are shown in table 1 below.

1) The reflectance (reference wavelength 550nm) was measured by an olympus reflectance measuring instrument, and the measurement results are shown in table 1 below.

2) The metallographic microscope was used to photograph the metallographic images of the surfaces of the cases 100 obtained in example 2 and comparative example 1, as shown in fig. 9 to 12, where fig. 9 is a photograph of the metallographic image magnified 50 times in example 2, fig. 10 is a photograph of the metallographic image magnified 100 times in example 2, fig. 11 is a photograph of the metallographic image magnified 50 times in comparative example 1, and fig. 12 is a photograph of the metallographic image magnified 100 times in comparative example 1.

3) The appearance chart was photographed with a camera, and the result is shown in fig. 13.

TABLE 1 Process parameters and Performance parameters for the examples and comparative examples

As can be seen from fig. 9 and 10, the particle size distribution of the shell 100 obtained in example 2 is between 20 μm and 32 μm, and as can be seen from fig. 11 and 12, the particle size distribution of the shell obtained in comparative example 1 is between 20 μm and 30 μm. This shows that the particle size of the shell prepared in the examples of the present application is similar to the particle size of the shell prepared by metal blasting and anodizing, and the appearance effect of the shell has very similar granular appearance.

In fig. 13, a denotes the case 100 of example 1, b denotes the case 100 of example 2, c denotes the case 100 of example 3, d denotes the case 100 of example 4, and e denotes the case 100 of comparative example 1. As can be seen from fig. 13 and table 1, the shells 100 obtained in examples 1 to 4 of the present application have similar reflectance and granular visual effect to those obtained in comparative example 1, and the reflectance of the obtained shells 100 gradually decreases as the second particle concentration increases, which means that the higher the second particle concentration is, the larger the light scattering or diffuse reflection of the topcoat layer 70 is, and the lower the reflectance of the obtained shells 100 is.

Referring to fig. 14 to 16, an embodiment of the present application further provides an electronic device 400, which includes: a display assembly 410, a housing 100 according to an embodiment of the present application, and a circuit board assembly 430. The display component 410 is for displaying; the housing 100 is used for carrying the display component 410; the circuit board assembly 430 is electrically connected to the display assembly 410, and is used for controlling the display assembly 410 to display.

The electronic device 400 of the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart bracelet, a smart watch, an electronic reader, and a game console.

For a detailed description of the housing 100, please refer to the description of the corresponding parts of the above embodiments, which is not repeated herein.

Alternatively, the display module 410 may be, but is not limited to, one or more of a liquid crystal display module, a light emitting diode display module (LED display module), a micro light emitting diode display module (micro LED display module), a sub-millimeter light emitting diode display module (MiniLED display module), an organic light emitting diode display module (OLED display module), and the like.

Referring also to fig. 16, optionally, the circuit board assembly 430 may include a processor 431 and a memory 433. The processor 431 is electrically connected to the display component 410 and the memory 433, respectively. The processor 431 is configured to control the display component 410 to display, and the memory 433 is configured to store program codes required by the processor 431 to operate, program codes required by the display component 410 to be controlled, display contents of the display component 410, and the like.

Optionally, processor 431 includes one or more general-purpose processors 431, where general-purpose processor 431 may be any type of device capable of Processing electronic instructions, including a Central Processing Unit (CPU), a microprocessor, a microcontroller, a host processor, a controller, an ASIC, and so forth. Processor 431 is configured to execute various types of digitally stored instructions, such as software or firmware programs stored in memory 433, which enable the computing device to provide a wide variety of services.

Alternatively, the Memory 433 may include a Volatile Memory (Volatile Memory), such as a Random Access Memory (RAM); the Memory 433 may also include a Non-volatile Memory (NVM), such as a Read-Only Memory (ROM), a Flash Memory (FM), a Hard Disk (HDD), or a Solid-State Drive (SSD). The memory 433 may also include a combination of memories of the sort described above.

Referring to fig. 15 again, in some embodiments, the casing 100 is a middle frame of an electronic apparatus, the electronic apparatus of the embodiments of the present application further includes a rear cover 420 and a camera module 450, the rear cover 420 is disposed on a side of the casing 100 away from the display element 410, and a side surface of the casing 100 is exposed to the rear cover 420 and the display element 410. The rear cover 420 and the housing 100 enclose an accommodating space for accommodating the circuit board assembly 430 and the camera module 450. The camera module 450 is electrically connected to the processor 431, and is configured to perform shooting under the control of the processor 431.

Optionally, the rear cover 420 has a light-transmitting portion 421, and the camera module 450 can shoot through the light-transmitting portion 421 on the rear cover 420, that is, the camera module 450 in this embodiment is a rear camera module 450. It is understood that in other embodiments, the transparent portion 421 may be disposed on the display module 410, that is, the camera module 450 is a front camera module 450. In the schematic view of the present embodiment, the light-transmitting portion 421 is illustrated as an opening, but in other embodiments, the light-transmitting portion 421 may not be an opening, but may be a light-transmitting material, such as plastic or glass.

It should be understood that the electronic device described in this embodiment is only one form of the electronic device to which the housing 100 is applied, and should not be construed as limiting the electronic device provided in this application, nor should it be construed as limiting the housing 100 provided in each embodiment of this application.

Reference in the specification to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the embodiments of the present application may be combined arbitrarily without contradiction between them to form another embodiment without departing from the spirit and scope of the present application.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A housing, comprising:

a housing body;

2. The housing of claim 1 wherein the primer layer comprises a first sub-primer layer and a second sub-primer layer, the first sub-primer layer is disposed closer to the housing body than the second sub-primer layer, the first particles are dispersed in at least one of the first sub-primer layer and the second sub-primer layer, such that the first particles cooperate with the coating layer to form a plurality of protrusions on a surface of the coating layer away from the second sub-primer layer, the protrusions being micro-scale protrusions.

3. The casing of claim 2, wherein when the first particles are dispersed in the first sub-primer layer, the first particles have an average particle size greater than or equal to a thickness of a primer layer; when the first particles are dispersed in the second sub-primer layer or in the first and second sub-primer layers, the average particle diameter of the first particles is greater than or equal to the thickness of the second sub-primer layer.

4. The case of claim 3, wherein the thickness d11 of the first sub-primer layer ranges from: d11 is more than or equal to 2 mu m and less than or equal to 4 mu m; the thickness d12 of the second sub-primer layer ranges from: d12 is more than or equal to 3 mu m and less than or equal to 7 mu m; the range of the average particle size r1 of the first particles is 3 mu m-r 1-10 mu m.

5. The housing of claim 1, wherein the first particles comprise one or more of nylon particles, glass particles, polymethacrylate particles, silica particles, or titanium dioxide particles, and wherein the mass fraction of the first particles in the primer layer comprising the first particles is from 1.5% to 5%.

6. The housing of claim 1, further comprising a topcoat layer disposed on a side of the plated layer facing away from the primer layer; the finish paint layer comprises second particles, the second particles are dispersed in the finish paint layer, and the refractive index of the second particles is different from that of the finish paint layer.

7. The housing of claim 6, wherein the second particles are matte particles; the second particles comprise one or more of silica particles, nylon particles or titanium dioxide particles, the mass fraction of the second particles in the finish paint layer is 4-21%, and the average particle size r2 of the second particles is in the range of 3 mu m or more and r2 or more and 10 mu m or less; the thickness d4 of the finishing paint layer ranges from: d4 is more than or equal to 14 mu m and less than or equal to 20 mu m.

8. The housing of claim 1 wherein the coating is a metal coating comprising one or more of indium, tin, an alloy containing indium, an alloy containing tin, or an alloy containing indium and tin, the coating having a visible light transmittance T in the range of: t is more than or equal to 7% and less than or equal to 13%, and the visible light reflectivity R of the coating layer is in the range: r is more than or equal to 75% and less than or equal to 90%, and the thickness d2 of the coating layer is in the range of: d2 is more than or equal to 40nm and less than or equal to 80 nm.

9. The housing of any one of claims 1-8, further comprising a color paint layer disposed on a surface of the plated layer remote from the primer layer; the thickness d3 of the color paint layer ranges from: d3 is more than or equal to 4 mu m and less than or equal to 8 mu m.

10. A method of making a housing, comprising:

providing a shell body;

forming a primer layer on the surface of the shell body, wherein first particles are dispersed in the primer layer, and the first particles are micron-sized particles; and

11. The method of manufacturing a casing according to claim 10, wherein the primer layer includes a first sub-primer layer and a second sub-primer layer which are stacked, the first sub-primer layer is disposed closer to the casing body than the second sub-primer layer, and forming the primer layer on the surface of the casing body includes:

spraying a first primer on the surface of the shell body;

spraying a second primer on the surface of the first primer, wherein the first particles are dispersed in at least one of the first primer and the second primer; and

to the first primer andthe second primer has a light intensity of 80mw/cm²To 200mw/cm²Curing energy 500mj/cm²To 600mj/cm²And carrying out photocuring, so that the first primer forms the first sub-primer layer, and the second primer forms the second sub-primer layer.

12. The method for producing a housing according to claim 10 or 11, wherein the step of forming a coating layer on the surface of the primer layer facing away from the housing body is performed after the step of forming a coating layer on the surface of the primer layer facing away from the housing body; the method further comprises the following steps:

spraying color paint on the surface of the coating layer far away from the primer layer, wherein the light intensity is 80mw/cm²To 200mw/cm²Curing energy 350mj/cm²To 500mj/cm²Carrying out photocuring to obtain a colored paint layer; and

spraying finish paint on the surface of the colored paint layer deviating from the coating layer, wherein the light intensity is 80mw/cm²To 200mw/cm²Curing energy 800mj/cm²To 1000mj/cm²And carrying out photocuring to obtain the finish paint layer.

13. An electronic device, comprising:

a display component;

the housing of any one of claims 1 to 9, for carrying the display assembly; and