Crystal grain coating, crystal grain decorative film, shell, preparation methods of crystal grain coating, crystal grain decorative film and shell, and electronic equipment

Abstract

The invention relates to the technical field of decoration of electronic equipment, in particular to a crystal grain coating, a crystal grain decorative film and a preparation method thereof, a shell and a preparation method thereof and electronic equipment. The crystal grain coating comprises a salt compound and a solvent, and the salt compound and the solvent meet the following conditions: (1) the salt compound can be dissolved in the solvent at the temperature of 15-40 DEG C; and (2) at the temperature of 15-40 DEG C, the salt compound can be separated out and crystallized along with volatilization of the solvent to form a texture pattern. According to the novel crystal grain coating provided by the invention, a novel crystal grain appearance effect can be formed at the temperature of 15-40 DEG C by virtue of precipitation and crystallization of the salt compound from the solvent, the formed crystal grain visual effect and texture touch are unique, and the appearance expressive force and competitiveness of electronic equipment can be improved when the novel crystal grain coating is applied to the electronic equipment.

Description

Technical Field

[0001] The present application relates to the technical field of decoration of electronic equipment, and in particular to a crystal grain paint, a crystal grain decorative film and a preparation method thereof, a housing and a preparation method thereof, and an electronic equipment. Background Art

[0002] In recent years, electronic equipment products have developed rapidly, and consumers have higher and higher requirements for the appearance and decoration of electronic equipment products. Enriching the appearance and decoration effects of electronic equipment is also an important direction of technological innovation of electronic equipment products. Summary of the invention

[0003] Based on this, the present application provides a crystal grain paint, a crystal grain decorative film and a preparation method thereof, a housing and a preparation method thereof, and an electronic device.

[0004] The first aspect of the present application provides a crystal grain coating, and the technical solution thereof is as follows:

[0005] A crystal grain coating, comprising a salt compound and a solvent, wherein the salt compound and the solvent meet the following conditions:

[0006] (1) The salt compound can be dissolved in the solvent at a temperature of 15°C to 40°C;

[0007] (2) At a temperature of 15° C. to 40° C., the salt compound can precipitate and crystallize to form a texture pattern as the solvent evaporates.

[0008] The second aspect of the present application provides a crystal pattern decorative film, and its technical solution is as follows:

[0009] A crystal grain decorative film comprises a crystal grain layer, wherein the raw material of the crystal grain layer comprises the above-mentioned crystal grain paint.

[0010] The third aspect of the present application provides a method for preparing a crystal pattern decorative film, and the technical solution thereof is as follows:

[0011] A method for preparing a crystal grain decorative film comprises the following steps: coating the crystal grain coating and then volatilizing the solvent to form a crystal grain layer.

[0012] A fourth aspect of the present application provides a housing, and its technical solution is as follows:

[0013] A shell comprises a shell substrate and the above-mentioned crystal pattern decorative film, wherein the shell substrate has an inner surface and an outer surface, and the crystal pattern decorative film is located on the inner surface or the outer surface.

[0014] The fifth aspect of the present application provides a method for preparing a shell, and the technical solution thereof is as follows:

[0015] A method for preparing a shell comprises the following steps:

[0016] The crystal pattern decorative film is formed on the inner surface or the outer surface of the shell substrate.

[0017] A sixth aspect of the present application provides an electronic device, and its technical solution is as follows:

[0018] An electronic device comprises a display module, the above-mentioned housing and a circuit board;

[0019] The housing and the display module enclose a containing space;

[0020] The circuit board is arranged in the accommodating space and is electrically connected to the display module.

[0021] Compared with the traditional solution, this application has the following beneficial effects:

[0022] The present application provides a novel crystal grain coating, which can form a novel crystal grain appearance effect by crystallizing a salt compound from a solvent at a temperature of 15°C to 40°C. The crystal grain has a unique visual effect and texture touch. It can be used in electronic devices to improve the appearance expression and competitiveness of the electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more completely understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0024] Figure 1 A real-life picture of a grain layer according to an embodiment;

[0025] Figure 2 is a schematic structural diagram of a crystal pattern decorative film according to an embodiment;

[0026] Figure 3 is a schematic structural diagram of a housing according to an embodiment;

[0027] Figure 4 is a schematic structural diagram of a housing according to another embodiment;

[0028] Figure 5 is a schematic flow chart of a method for preparing a shell according to an embodiment;

[0029] Figure 6 It is a schematic diagram of the process of a method for preparing a shell according to another embodiment. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] the term

[0033] Unless otherwise specified or there is a contradiction, the terms and phrases used in this application have the following meanings:

[0034] In the present application, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the present application, "several" means at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0035] In this application, "optionally", "optional" and "optional" refer to optional, that is, to any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0036] In this application, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0037] In the present application, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the present application, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by a person skilled in the art.

[0039] In this application, electronic devices may be, but are not limited to, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. IoT devices may be smart speakers, smart TVs, smart air conditioners, smart car devices, etc. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc.

[0040] In order to enrich the appearance of electronic devices, the first aspect of the present application provides a crystal grain coating. In one embodiment, the crystal grain coating includes a salt compound and a solvent, wherein the salt compound and the solvent meet the following conditions:

[0041] (1) The salt compound can be dissolved in the solvent at a temperature of 15°C to 40°C;

[0042] (2) At a temperature of 15°C to 40°C, salt compounds can precipitate and crystallize to form a texture pattern as the solvent evaporates.

[0043] The crystal grain coating of this embodiment is a new type of crystal grain coating, which can form a new type of crystal grain appearance effect by crystallizing salt compounds from solvents at a temperature of 15°C to 40°C. The formed crystal grain has unique visual effect and texture touch. It can be used in electronic devices to improve the appearance expression and competitiveness of electronic devices.

[0044] The crystallization process of salt compounds can be divided into two stages: the nucleation stage and the growth stage. In the nucleation stage, small crystal nuclei are formed, and in the growth stage, the crystal nuclei gradually grow to form complete crystals. After the salt compounds of this embodiment are precipitated and crystallized from the solvent, crystal grains with an ice cracking effect can be formed. Optionally, the salt compounds are selected from metal salt compounds. Metal salt compounds are more likely to form crystal grains with an ice cracking effect. Optionally, the metal ions in the metal salt compounds include one or more of silver ions and copper ions. Optionally, the salt compounds include one or more of silver chloride and copper chloride. Taking silver chloride as an example, the chemical formula of its crystallization process can be expressed as: AgCl(aq)→AgCl(s). Among them, AgCl(aq) represents the state of silver chloride in the solvent, and AgCl(s) represents the state of silver chloride crystallized into crystals. During the crystallization process, silver chloride molecules will precipitate from the solvent to form crystals.

[0045] In this embodiment, the salt compound is dissolved in the solvent at a temperature of 15°C to 40°C, and the resulting solution has good fluidity and can achieve uniform coating. Optionally, the solvent includes one or more of water and ethanol. Optionally, the volume ratio of water to ethanol is (6 to 8): (2 to 4). For example, the volume ratio of water to ethanol includes but is not limited to 6:4, 7:3, and 8:2.

[0046] Optionally, the mass percentage of the salt compound in the crystal grain coating is 0.5% to 2%. For example, the mass percentage of the salt compound in the crystal grain coating includes but is not limited to 0.5%, 1%, 1.5%, and 2%.

[0047] By controlling the mass percentage of the salt compound in the crystal grain coating and the volume ratio of water to ethanol in the solvent, the shape and size of the formed crystal grain can be controlled.

[0048] Optionally, the crystal grain coating further comprises a crystal modifier and / or a thickener.

[0049] The crystallization regulator includes one or more of polyacrylamide, sodium polyacrylate and potassium polyacrylate. The crystallization regulator can control crystal growth and inhibit recrystallization, adjust the shape and size of the crystal, thereby maintaining the stability and uniformity of the crystal to meet different application requirements.

[0050] Optionally, the volume percentage of the crystal modifier in the crystal grain coating is 0.1% to 1%, including but not limited to 0.1%, 0.4%, 0.6%, 0.8%, and 1%. The amount of the crystal modifier added can be adjusted according to the actual crystal form.

[0051] Thickeners include polyvinyl alcohol (PVA). PVA can be prepared by polymerizing vinyl alcohol and has excellent durability. The thickener can increase the viscosity of the crystal grain paint and improve the adhesion of the crystal grain paint.

[0052] Optionally, the volume percentage of the thickener in the crystal grain coating is 0.1% to 1%, including but not limited to 0.1%, 0.4%, 0.6%, 0.8%, and 1%. Preferably, the volume percentage of the thickener in the crystal grain coating is 0.6% to 0.8%. The amount of thickener added can be adjusted according to the actual crystal form.

[0053] A second aspect of the present application provides a crystal-grain decorative film. In one embodiment, the crystal-grain decorative film includes a crystal-grain layer, and a raw material of the crystal-grain layer includes the above-mentioned crystal-grain coating.

[0054] It is understandable that the grain layer includes salt compounds. Optionally, the grain layer also includes a crystal modifier and / or a thickener. In this embodiment, the grain layer includes salt compounds, a crystal modifier and a thickener.

[0055] The crystal grain decorative film of this embodiment can be used in electronic devices to provide a crystal grain appearance effect. Considering the connection between the crystal grain decorative film and the part to be connected, the crystal grain decorative film optionally further includes a cured adhesive layer, which is stacked on one side or both sides of the crystal grain layer. Through the cured adhesive layer, the crystal grain layer can be more firmly connected to the part to be connected, avoiding the crystal grain layer from falling off due to insufficient bonding force between the crystal grain layer and the part to be connected, and protecting the crystal grain layer.

[0056] Optionally, the curable adhesive layer may be a UV-curable adhesive layer. Optionally, the raw material of the UV-curable adhesive layer includes a two-component UV-curable adhesive. Optionally, the two-component UV-curable adhesive includes a component A and a component B, wherein the component A includes a polyurethane prepolymer and the component B includes a curing agent. Optionally, the two-component UV-curable adhesive may be water-soluble, and the raw material of the UV-curable adhesive layer may also include water, and the two-component UV-curable adhesive may be mixed with water, applied and cured to form a UV-curable adhesive layer.

[0057] In some examples, the mass ratio of component A, component B and water is (90-100):(3-6):(0-6).

[0058] In this embodiment, the model of the polyurethane prepolymer is WVBB00725, and the model of the curing agent is SZH0062.

[0059] Optionally, the thickness of the UV-curable adhesive layer is 5 μm to 12 μm.

[0060] The third aspect of the present application provides a method for preparing a crystal-grained decorative film. In one embodiment, the method for preparing the crystal-grained decorative film comprises the following steps:

[0061] After the above-mentioned crystal grain coating is applied, the solvent is volatilized to form a crystal grain layer.

[0062] Optionally, the parameters for forming the grain layer include: the ambient temperature for coating the grain coating is 15° C. to 40° C.

[0063] The method of coating the crystal grain coating may be spray coating, and the coating thickness may be 2 μm to 10 μm. The coating thickness may affect the extension length and coverage of the crystal grain.

[0064] After the crystal grain coating is applied, the coating is allowed to stand for a period of 2 to 8 minutes, during which the solvent evaporates.

[0065] It is understandable that during the solvent volatilization process, the shape and size of the crystal grain can be controlled by controlling the ambient temperature, ambient humidity, and ambient wind speed. Optionally, the parameters for forming the crystal grain layer also include: the ambient temperature of the volatilizing solvent is 15°C to 40°C, the ambient relative humidity of the volatilizing solvent is 25% to 75%, and the ambient wind speed of the volatilizing solvent is 0.3m / s to 0.5m / s. For example: the ambient temperature of the volatilizing solvent is 15°C, 20°C, 25°C, 30°C, 35°C, and 40°C. The ambient relative humidity of the volatilizing solvent is 25%, 50%, and 75%. The ambient wind speed of the volatilizing solvent is 0.3m / s, 0.4m / s, and 0.5m / s.

[0066] In this embodiment, the crystal grain coating is atomized by a spray gun and evenly sprayed on a surface, and then left to stand. During this process, the solvent evaporates continuously, forming a crystal grain layer with an ice crack effect on the surface. Figure 1 This is a real-life picture of the crystal layer formed on the PC film after the crystal coating is applied on the PC film and the solvent is volatilized. A texture similar to the ice crack effect can be observed, and it has a unique touch.

[0067] It can be understood that the above-mentioned one surface can be the inner surface or the outer surface of the shell substrate, and can be the surface of the cured adhesive layer.

[0068] Optionally, the method for preparing the crystal pattern decorative film further comprises the following steps: coating the curing adhesive and curing the curing adhesive to form a curing adhesive layer. It is understandable that the curing adhesive layer can be formed on one side or both sides of the crystal pattern layer.

[0069] The method of applying the curing adhesive may be spraying.

[0070] Optionally, the curing glue can be a two-component UV curing glue, and the two-component UV curing glue is as described above. Optionally, the curing parameters include: curing temperature of 50°C to 70°C; curing time of 10min to 15min; UV energy of 750mJ / cm 3 ~1200mJ / cm 3 .

[0071] In this embodiment, please refer to Figure 2The crystal pattern decorative film 10 includes a crystal pattern layer 101, and a first cured adhesive layer 102 and a second cured adhesive layer 103 respectively stacked on both sides of the crystal pattern layer. The crystal pattern layer 101 can be firmly connected to the part to be connected through the first cured adhesive layer 102 and the second cured adhesive layer 103, so as to avoid the crystal pattern layer 101 from falling off due to insufficient bonding force between the crystal pattern layer 101 and the part to be connected, and the crystal pattern layer 101 can be protected.

[0072] The method for preparing the crystal pattern decorative film 10 of this embodiment includes the following steps:

[0073] After mixing two-component UV-curing glue with water, spray it evenly on a surface and UV-cure it to form a first cured glue layer 102; after atomizing the crystal grain paint with a spray gun, spray it evenly on the first cured glue layer and let it stand to form a crystal grain layer 101 with an ice crack effect; after mixing two-component UV-curing glue with water, spray it evenly on the crystal grain layer and UV-cure it to form a second cured glue layer 103.

[0074] It can be understood that the above-mentioned one surface is the surface to be connected of the part to be connected. It can be the inner surface or outer surface of the shell substrate, or the surface of the carrier film. In this embodiment, both sides of the crystal layer are provided with a curing adhesive layer, and both sides can be firmly connected to the part to be connected.

[0075] A fourth aspect of the present application provides a shell. In one embodiment, the shell includes a shell substrate and the above-mentioned crystal decorative film. The shell substrate has an inner surface and an outer surface, and the crystal decorative film is located on the inner surface or the outer surface.

[0076] Optionally, the shell substrate is made of plastic, for example, PC (polycarbonate).

[0077] Considering the problem of insufficient bonding strength between the grain layer and the shell substrate in the grain decorative film, preferably, the grain decorative film comprises a grain layer and a cured adhesive layer stacked on one side of the grain layer, and the grain decorative film is connected to the shell substrate via the cured adhesive layer.

[0078] Optionally, the shell further includes a hardening layer. In some examples, the crystal decorative film is located on the inner surface, and the hardening layer is located on the outer surface. In other examples, the crystal decorative film is located on the outer surface, and the hardening layer is located on the crystal decorative film. At this time, considering the problem of insufficient bonding between the crystal layer and the hardening layer in the crystal decorative film, preferably, the crystal decorative film includes a crystal layer and a cured adhesive layer stacked on both sides of the crystal layer, and the crystal decorative film is connected to the shell substrate through the cured adhesive layer on one side, and is connected to the hardening layer through the cured adhesive layer on the other side.

[0079] Optionally, the shell further includes an appearance functional layer. In some examples, the crystal decorative film is located on the inner surface, and the appearance functional layer is located on the crystal decorative film. At this time, considering the problem of insufficient bonding between the crystal layer and the appearance functional layer in the crystal decorative film, preferably, the crystal decorative film includes a crystal layer and a cured adhesive layer stacked on both sides of the crystal layer, and the crystal decorative film is connected to the shell substrate through the cured adhesive layer on one side and connected to the appearance functional layer through the cured adhesive layer on the other side. In other examples, the crystal decorative film is located on the outer surface, and the appearance functional layer is located on the inner surface.

[0080] Optionally, the appearance functional layer includes one or more layers of a cover bottom ink layer, a color layer, a preset texture layer and an optical adhesive layer, wherein the cover bottom ink layer can be used for fire prevention.

[0081] To meet the needs, the inner surface or outer surface of the shell substrate, especially the outer surface, usually has a three-dimensional shape, such as a 3D shape. When the shell substrate has a three-dimensional shape on the surface (inner surface or outer surface) on the side where the crystal decorative film is located, the shell also includes a carrier film, the material of the carrier film is the same as that of the shell substrate, and is located between the crystal decorative film and the shell substrate. At this time, considering the problem of insufficient bonding between the crystal layer and the carrier film in the crystal decorative film, preferably, the crystal decorative film includes a crystal layer and a solidified adhesive layer stacked on both sides of the crystal layer. The crystal decorative film is connected to the shell substrate through the solidified adhesive layer on one side and connected to the carrier film through the solidified adhesive layer on the other side. The crystal decorative film can be first formed on the carrier film, and then the side of the carrier film away from the crystal decorative film is fused with the three-dimensional surface of the shell substrate by film injection molding to form a crystal decorative film on the surface with a three-dimensional shape. Optionally, the thickness of the carrier film is 0.05μm to 0.2μm. For example, the thickness is 0.05 μm, 0.12 μm, or 0.2 μm.

[0082] In this implementation, see Figure 3 The shell 1 includes a crystal decorative film 10, a shell substrate 11, a hardening layer 12, an appearance functional layer 13 and a carrier film 14. The shell substrate 11 has an outer surface 11A and an inner surface 11B, the outer surface 11A has a three-dimensional shape, the carrier film 14 is located on the outer surface 11A, the crystal decorative film 10 is located on the carrier film 14, and the hardening layer 12 is located on the crystal decorative film 10. The crystal decorative film 10 is connected to the carrier film through a first cured adhesive layer 102, and is connected to the hardening layer through a second cured adhesive layer 103. The appearance functional layer 13 is located on the inner surface 11B.

[0083] In another embodiment, see Figure 4The shell 2 includes a crystal decorative film 10, a shell substrate 21, a hardened layer 22 and an appearance functional layer 23. The shell substrate 21 has an outer surface 21A and an inner surface 21B, the hardened layer 22 is located on the outer surface 21A, the crystal decorative film 10 is located on the inner surface 21B, and the appearance functional layer 23 is located on the crystal decorative film 10. The crystal decorative film 10 is connected to the inner surface 21B through a first cured adhesive layer 102, and is connected to the appearance functional layer 23 through a second cured adhesive layer 103.

[0084] The housing of the present application has all the advantages of the above-mentioned crystal decorative film.

[0085] A fifth aspect of the present application provides a method for preparing a shell. In one embodiment, the method for preparing a shell includes the following steps: forming the above-mentioned crystal pattern decorative film on the inner surface or outer surface of the shell substrate.

[0086] Optionally, the shell base is made of plastic. The shell base can be formed by compression injection molding or by hot bending a flat plate.

[0087] The preparation method of the crystal-grain decorative film is as described above. The crystal-grain coating may be applied on the inner or outer surface of the shell substrate and then the solvent may be volatilized to form a crystal-grain layer, so as to form a crystal-grain decorative film on the inner or outer surface of the shell substrate. The curing glue may be applied on the inner or outer surface of the shell substrate and then cured to form a cured glue layer, and the crystal-grain coating may be applied on the cured glue layer and then the solvent may be volatilized to form a crystal-grain layer, so as to form a crystal-grain decorative film on the inner or outer surface of the shell substrate. The curing glue may be applied on the inner or outer surface of the shell substrate and then cured to form a first cured glue layer, and the crystal-grain coating may be applied on the first cured glue layer and then the solvent may be volatilized to form a crystal-grain layer, and the curing glue may be applied on the crystal-grain layer and then cured to form a second cured glue layer, so as to form a crystal-grain decorative film on the inner or outer surface of the shell substrate.

[0088] Optionally, the method for preparing the shell further comprises the following steps: coating a hardening liquid on the outer surface of the shell substrate or the crystal pattern decorative film to form a hardened layer. The coating method may be flow coating.

[0089] Optionally, the method for preparing the shell further comprises the following steps: forming an appearance functional layer on the inner surface of the shell substrate or the crystal decorative film. The appearance functional layer comprises one or more layers of a cover bottom ink layer, a color layer, a preset texture layer and an optical adhesive layer, and each layer can be formed by laminating or coating according to the characteristics of each layer in the appearance functional layer.

[0090] Optionally, the shell substrate has a three-dimensional shape on the surface (inner surface or outer surface) on the side where the crystal decorative film is located, and forming the crystal decorative film on the surface includes the following steps: taking a carrier film of the same material as the shell substrate, and forming the crystal decorative film on the carrier film; and integrating the carrier film away from the crystal decorative film with the surface having the three-dimensional shape through in-mold injection molding.

[0091] It can be understood that the method of forming the crystal-grained decorative film on the carrier film can refer to the method of forming the crystal-grained decorative film on the inner surface or the outer surface of the shell substrate.

[0092] Optionally, the side of the carrier film away from the crystal decorative film is fused with the surface with a three-dimensional shape by in-mold injection molding, which may include the following steps: positioning the carrier film with the crystal decorative film inside the injection mold and exposing the side of the carrier film away from the crystal decorative film, injecting plastic into the mold, and performing compression injection molding to form a shell substrate while fusion of the side of the carrier film away from the crystal decorative film with the surface with a three-dimensional shape of the shell substrate.

[0093] It can be understood that the method for preparing the shell also includes CNC and assembly steps.

[0094] In this implementation, see Figure 5 , the preparation method of the shell 1 comprises the following steps:

[0095] S11 , forming a crystal pattern decorative film 10 on a carrier film 14 .

[0096] The carrier film 14 is a PC film, on which a two-component UV-curing glue is coated and then cured to form a first cured glue layer 102; a crystal-grain coating is coated on the first cured glue layer 102 and the solvent is evaporated to form a crystal-grain layer 101; and a two-component UV-curing glue is coated on the crystal-grain layer 101 and then cured to form a second cured glue layer 103.

[0097] S12 , forming a hardening layer 13 on the crystal pattern decoration layer 10 .

[0098] A curing liquid is sprayed on the second curing adhesive layer 103 to form a curing layer 12 .

[0099] S13, In-mold Injection Molding

[0100] The carrier film 14 with the crystal decorative film 10 and the hardening layer 12 is placed in an injection mold, PC is injected, and compression injection molding is performed to form the shell substrate 11 while the side of the carrier film 14 away from the crystal decorative film 10 is fused with the outer surface 11A of the shell substrate 11 with a three-dimensional shape.

[0101] S14 , forming an appearance functional layer 13 on the inner surface 11B of the shell substrate 11 .

[0102] In another embodiment, see Figure 6 , the preparation method of the shell 2 comprises the following steps:

[0103] S21, forming a shell substrate 102.

[0104] PC is injected into the injection mold and compression-molded to form a shell base 102 . The shell base 102 has an outer surface 21A and an inner surface 21B. The inner surface 21B is a plane.

[0105] S22 , forming a hardened layer 22 on the outer surface 21A of the shell base 102 .

[0106] The hardening liquid is coated on the outer surface 21A of the shell substrate 102 to form a hardened layer 22 .

[0107] S23 , forming a crystal pattern decoration layer 10 on the inner surface 21B of the shell substrate 102 .

[0108] A two-component UV-curable glue is coated on the outer surface 21B of the shell substrate 102 and then cured to form a first cured glue layer 102 ; a crystal coating is coated on the first cured glue layer 102 and then the solvent is volatilized to form a crystal layer 101 ; a two-component UV-curable glue is coated on the crystal layer 101 and then cured to form a second cured glue layer 103 .

[0109] S24 , forming an appearance functional layer 23 on the crystal pattern decoration layer 10 .

[0110] Generally speaking, when the shell substrate is formed by compression injection molding, the mold can be sun-textured to achieve highlight, flash sand or other texture effects, or the shell substrate can be textured by in-mold injection molding (such as IML), or the shell substrate can be patterned by spraying paint. When the shell substrate is formed by hot bending of a flat sheet, the sheet after hot bending can be surface processed to form a pattern on the shell substrate. Compared with the above method, the crystal decorative film formed on the shell substrate in this embodiment has a more unique visual effect and touch. The method of this embodiment is an innovative extension based on the traditional shell appearance scheme, which is conducive to improving the appearance expression of the shell.

[0111] A sixth aspect of the present application provides an electronic device. In one embodiment, the electronic device includes a display module, the above-mentioned housing, and a circuit board;

[0112] The housing and the display module enclose a containing space;

[0113] The circuit board is arranged in the accommodating space and is electrically connected to the display module.

[0114] The electronic device of the present application has all the advantages of the above-mentioned housing.

[0115] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A crystal grain coating, characterized in that: Comprising a salt compound and a solvent, wherein the salt compound and the solvent meet the following conditions: (1) The salt compound can be dissolved in the solvent at a temperature of 15°C to 40°C; (2) At a temperature of 15° C. to 40° C., the salt compound can precipitate and crystallize to form a texture pattern as the solvent evaporates.

2. The crystal grain coating according to claim 1, characterized in that: The salt compound is selected from metal salt compounds.

3. The crystal grain coating according to claim 2, characterized in that: The metal ions in the metal salt compound include one or more of silver ions and copper ions.

4. The crystal grain coating according to claim 3, characterized in that: The salt compound includes one or more of silver chloride and copper chloride.

5. The crystal grain paint according to claim 1, characterized in that: The solvent includes one or more of water and ethanol.

6. The crystal grain paint according to any one of claims 1 to 5, characterized in that: The mass percentage of the salt compound in the crystal grain coating is 0.5% to 2%.

7. The crystal grain paint according to any one of claims 1 to 5, characterized in that: The crystal grain paint further comprises a crystal modifier and / or a thickener.

8. The crystal grain paint according to claim 7, characterized in that: Includes one or more of the following characteristics: (1) The crystallization regulator includes one or more of polyacrylamide, sodium polyacrylate and potassium polyacrylate; (2) The volume percentage of the crystal modifier in the crystal grain coating is 0.1% to 1%; (3) The thickener includes polyvinyl alcohol; (4) The volume percentage of the thickener in the crystal grain coating is 0.1% to 1%.

9. A crystal decorative film, characterized in that: It comprises a grain layer, and the raw material of the grain layer comprises the grain coating according to any one of claims 1 to 8.

10. The crystal decorative film according to claim 9, characterized in that: It also includes a curing adhesive layer, which is stacked on one side or both sides of the crystal texture layer.

11. The crystal decorative film according to claim 10, characterized in that: Includes one or more of the following characteristics: (1) The curable adhesive layer is a UV-curable adhesive layer, the raw material of the UV-curable adhesive layer includes a two-component UV-curable adhesive, the two-component UV-curable adhesive includes a component A and a component B, the component A includes a polyurethane prepolymer, and the component B includes a curing agent; (2) The thickness of the cured adhesive layer is 5 μm to 12 μm.

12. A method for preparing a crystal decorative film, characterized in that: The method comprises the following steps: applying the crystal grain coating according to any one of claims 1 to 8 and then volatilizing the solvent to form a crystal grain layer.

13. The method for preparing the crystal decorative film according to claim 12, characterized in that: The following steps are also included: After the curing adhesive is applied, it is cured to form a curing adhesive layer.

14. A housing, characterized in that: The invention comprises a shell substrate and the crystal-grained decorative film according to any one of claims 9 to 11, wherein the shell substrate has an inner surface and an outer surface, and the crystal-grained decorative film is located on the inner surface or the outer surface.

15. The housing according to claim 14, characterized in that The crystal pattern decorative film is connected to the shell substrate via a cured adhesive layer.

16. The housing according to claim 14, characterized in that The shell also includes a hardening layer; The crystal decorative film is located on the inner surface, and the hardened layer is located on the outer surface; or The crystal grain decorative film is located on the outer surface, and the hardening layer is located on the crystal grain decorative film.

17. The housing according to claim 16, characterized in that The crystal pattern decorative film is connected to the hardening layer through a curing adhesive layer.

18. The housing according to claim 14, characterized in that The housing further comprises an appearance functional layer; The crystal decorative film is located on the inner surface, and the appearance functional layer is located on the crystal decorative film; or The crystal decorative film is located on the outer surface, and the appearance functional layer is located on the inner surface.

19. The housing according to claim 18, characterized in that The crystal pattern decorative film is connected to the appearance functional layer through a cured adhesive layer.

20. The housing according to claim 18, characterized in that The appearance functional layer includes one or more layers of a cover bottom ink layer, a color layer, a preset texture layer and an optical adhesive layer.

21. The housing according to any one of claims 14, 16 to 20, characterized in that: The shell substrate has a three-dimensional shape on the surface of the side where the crystal pattern decorative film is located. The shell further includes a bearing film, which is made of the same material as the shell substrate and is located between the crystal pattern decorative film and the shell substrate.

22. The housing according to claim 21, characterized in that The crystal pattern decorative film is connected to the carrier film through a cured adhesive layer.

23. The housing according to any one of claims 14 to 20 and 22, characterized in that: The shell substrate is made of plastic.

24. A method for preparing a shell, characterized in that: The following steps are involved: The crystal decorative film according to any one of claims 9 to 11 is formed on the inner surface or the outer surface of the shell substrate.

25. The method for preparing a housing according to claim 24, characterized in that: It also includes one or more of the following steps: (1) applying a hardening liquid on the outer surface of the shell substrate or the crystal decorative film to form a hardened layer; (2) forming an appearance functional layer on the inner surface of the shell substrate or the crystal decorative film.

26. The method for preparing a housing according to any one of claims 24 to 25, characterized in that: The shell substrate has a three-dimensional shape on the surface of the side where the crystal decorative film is located, and forming the crystal decorative film on the surface includes the following steps: taking a carrier film made of the same material as the shell substrate, and forming the crystal decorative film on the carrier film; and fusing the carrier film away from the crystal decorative film with the surface having the three-dimensional shape through in-mold injection molding.

27. An electronic device, characterized in that: It comprises a display module, a housing as claimed in any one of claims 14 to 23, and a circuit board; The housing and the display module enclose a containing space; The circuit board is arranged in the accommodating space and is electrically connected to the display module.

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