Method for manufacturing a shell and shell

Abstract

The present disclosure relates to a shell manufacturing method and a shell, comprising: coating a primer layer on a polished surface of a base body; coating a metal texture color paint layer on a surface of the primer layer away from the base body; and coating a transparent protective layer on a surface of the color paint layer away from the primer layer. In the method of the present disclosure, the primer layer can effectively cover the polishing marks on the surface of the base body, and the metal texture color paint layer can effectively exhibit the metal texture color and brightness. The transparent protective layer can effectively transmit the metal texture color on the basis of improving the reliability of the metal texture color layer, and further ensure the metal texture effect of the shell.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the terminal field, and in particular to a shell manufacturing method and shell. BACKGROUND

[0002] With the improvement of people's living standards, terminal equipment has become an indispensable communication and entertainment tool for most people. Although the rich functions that terminal equipment can achieve are important, the appearance of terminal equipment is also a major factor in the choice of most users, therefore, improving the appearance of terminal equipment and improving competitiveness or recognition in appearance is crucial. SUMMARY

[0003] To overcome the problems in the related art, the present disclosure provides a shell manufacturing method and shell.

[0004] According to a first aspect of the embodiments of the present disclosure, a shell manufacturing method is provided, comprising:

[0005] applying a primer layer on the polished surface of the substrate body;

[0006] applying a color paint layer with metallic texture on the surface of the primer layer away from the substrate body;

[0007] applying a transparent protective layer on the surface of the color paint layer away from the primer layer.

[0008] In some embodiments, the step of applying a color paint layer with metallic texture on the surface of the primer layer away from the substrate body comprises:

[0009] spraying a preset color intermediate paint on the surface of the primer layer;

[0010] subjecting the substrate body with the sprayed preset color intermediate paint to drying treatment to obtain the color paint layer with metallic texture;

[0011] wherein the preset color intermediate paint comprises a first paint, and the first paint comprises modified nitrocellulose resin and nitrocellulose resin.

[0012] In some embodiments, the preset color intermediate paint further comprises a curing agent and a diluent, and the first paint, the curing agent and the diluent in the preset color intermediate paint satisfy the following ratio: (98-102):(3-7):(150-250).

[0013] In some embodiments, the thickness of the color paint layer is 2-6 μm.

[0014] In some embodiments, the modified nitrocellulose resin and the nitrocellulose resin in the first paint satisfy the following ratio: (90±5):(10±5).

[0015] In some embodiments, the solid content in the first paint is (15±5) %.

[0016] In some embodiments, the transparent protective layer is coated on the surface of the color paint layer away from the primer layer, comprising:

[0017] Spraying a transparent UV topcoat on the surface of the color paint layer;

[0018] Subjecting the substrate body coated with the UV topcoat to a drying process to obtain the transparent protective layer.

[0019] In some embodiments, the UV topcoat comprises: UV paint, curing agent and diluent, wherein the UV paint, the curing agent and the diluent satisfy the following ratio: (23-27):(73-77):(30-50).

[0020] In some embodiments, the thickness of the transparent protective layer is 22-24 μm.

[0021] In some embodiments, the primer layer is coated on the polished surface of the substrate body, comprising:

[0022] Spraying a first primer on the polished surface of the substrate body;

[0023] Subjecting the substrate body coated with the first primer to a drying process to obtain the first primer layer;

[0024] Spraying a second primer on the surface of the first primer layer;

[0025] Subjecting the substrate body coated with the second primer to a drying process to obtain the second primer layer.

[0026] In some embodiments, the second paint in the first primer and / or the second primer uses: low-hydroxy acrylic resin and medium-hydroxy acrylic resin.

[0027] In some embodiments, the first primer and the second primer both comprise: second paint, curing agent and diluent, wherein the second paint, the curing agent and the diluent satisfy the following ratio: (98-102):(8-12):(250-350).

[0028] In some embodiments, the thickness of the first primer layer is 7-11 μm, and the thickness of the second primer layer is 6-10 μm.

[0029] In some embodiments, the curing agent comprises polyurethane organic solvent, and the diluent comprises aliphatic organic solvent.

[0030] According to a second aspect of the embodiments of the present disclosure, a method for manufacturing a shell is provided, comprising:

[0031] The method for manufacturing the shell according to any one of the preceding embodiments is used to obtain a first shell.

[0032] A character pattern is printed on the surface of the transparent protective layer in the first shell to obtain a second shell.

[0033] In some embodiments, the method for manufacturing the shell, wherein the character pattern is printed on the surface of the transparent protective layer in the first shell to obtain a second shell, comprises:

[0034] The character pattern is printed on the surface of the transparent protective layer by pad printing;

[0035] The first shell with the printed character pattern is subjected to a drying treatment;

[0036] The first shell after the drying treatment is subjected to UV cold light curing to obtain the second shell.

[0037] In some embodiments, the method for manufacturing the shell, wherein the character pattern is printed on the surface of the transparent protective layer by pad printing, comprises:

[0038] A substrate with the character pattern is prepared;

[0039] Pad printing ink is injected into the character pattern on the substrate; wherein the pad printing ink comprises ink and curing agent;

[0040] The pad printing ink in the character pattern is pad printed onto the surface of the transparent protective layer.

[0041] In some embodiments, the method for manufacturing the shell, wherein the pad printing ink in the character pattern is pad printed onto the surface of the transparent protective layer, comprises:

[0042] The pad printing ink in the character pattern is sucked at least twice, and each time the pad printing ink is pad printed onto the surface of the transparent protective layer.

[0043] According to a third aspect of the embodiments of the present disclosure, a shell is provided, which is manufactured by the method for manufacturing a shell according to any one of the preceding embodiments; or is manufactured by the method for manufacturing a shell according to any one of the preceding embodiments.

[0044] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0045] In the method of the present disclosure, the primer layer can effectively cover the polishing marks on the surface of the substrate body, and the metal texture color paint layer can effectively play the metal texture color and brightness, and the transparent protective layer can effectively transmit the metal texture color on the basis of improving the reliability of the metal texture color layer, thereby further ensuring the metal texture effect of the shell.

[0046] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application.

[0048] Figure 1 is a flowchart of a method according to an example embodiment.

[0049] Figure 2 is a flowchart of a method according to an example embodiment.

[0050] Figure 3 is a flowchart of a method according to an example embodiment.

[0051] Figure 4 is a flowchart of a method according to an example embodiment.

[0052] Figure 5 is a flowchart of a method according to an example embodiment.

[0053] Figure 6 is a structural schematic diagram of a housing according to an example embodiment. DETAILED DESCRIPTION

[0054] The example embodiments will be described in detail herein with reference to the attached drawings. The description of the example embodiments is intended to apply to all alternative modifications and examples of the example embodiments, and is not limited to the example embodiments described herein. Specifically, since the scope of the present application is defined not by the description of the example embodiments but by the claims, it is necessarily understood that all the combinations that are not specifically excluded are deemed to be within the scope of the present application.

[0055] Metallic texture effect is a common effect for appearance decoration of electronic products, but there are problems in the related art as follows: metal materials need to be relied on to obtain the metallic texture effect, or the obtained metallic texture effect is not good enough. In addition, the related art also uses laser engraving to increase the appearance decoration of character identification, but the reliability of the character identification obtained by this way is not high, and the paint is easy to fall off.

[0056] This disclosure provides a method for preparing a housing, comprising: applying a primer layer to a polished surface of a substrate; applying a metallic-textured color paint layer to the surface of the primer layer away from the substrate; and applying a transparent protective layer to the surface of the color paint layer away from the primer layer. In this method, the primer layer effectively covers polishing marks on the surface of the substrate, allowing the metallic-textured color paint layer to more effectively express its metallic luster and brightness. The transparent protective layer, while improving the reliability of the metallic-textured color layer, effectively allows the metallic color to show through, further ensuring the metallic effect of the housing.

[0057] In one exemplary embodiment, such as Figure 1 As shown, the method for preparing the shell in this embodiment may include the following steps:

[0058] S110. Apply a primer layer to the sanded surface of the substrate.

[0059] S120. Apply a metallic-looking colored paint layer to the surface of the primer layer away from the substrate.

[0060] S130. Apply a transparent protective layer to the surface of the color paint layer away from the primer layer.

[0061] In step S110, the substrate body can be obtained through the following steps: (1) using a die-cast aluminum plate as the main structure of the middle frame, injection molding the die-cast aluminum plate, processing a plastic frame on the circumference of the die-cast aluminum plate and processing a plastic back shell on the back of the die-cast aluminum plate. (2) using a five-axis machine to grind and remove the parting line of the plastic part of the middle frame to obtain the substrate body of the desired terminal equipment shape.

[0062] In this step, a primer layer is applied to the surface of the substrate to effectively cover the sanding marks left by the five-axis sander.

[0063] In step S120, a colored paint layer is applied over the primer layer of the substrate to achieve a metallic effect. The metallic colored paint layer can be obtained by spraying a mid-coat of a preset color, such as silver-green.

[0064] In step S130, a transparent protective layer covers the colored paint layer, which, while protecting the colored paint layer, helps to ensure that the metallic color of the shell is visible on the exterior.

[0065] In the embodiment of the present disclosure, the primer layer is coated on the surface of the substrate body, the color paint layer is coated on the primer layer, and the transparent protective layer is coated on the color paint layer. The primer layer can effectively cover the polishing marks on the surface of the substrate body, and the color paint layer with metallic texture can effectively exhibit metallic color and brightness. The transparent protective layer can effectively transmit the metallic color on the basis of improving the reliability of the color layer with metallic texture, and further ensure the metallic texture effect of the shell.

[0066] In one example embodiment, the method of the present embodiment includes Figure 1 The steps S110 to S130 are shown. As shown in Figure 2 The step S110 in the present embodiment can include the following steps:

[0067] S1101, spraying a first primer on the polished surface of the substrate body.

[0068] S1102, drying the substrate body with the first primer to obtain a first primer layer.

[0069] S1103, spraying a second primer on the surface of the first primer layer.

[0070] S1104, drying the substrate body with the second primer to obtain a second primer layer.

[0071] In step S1101, the first primer can be a gray primer. The first primer can include a second paint, a curing agent, and a thinner. The second paint can use low-hydroxy acrylic resin and medium-hydroxy acrylic resin. The curing agent can use polyurethane organic solvent, and the thinner can use aliphatic organic solvent.

[0072] In this step, the three components in the first primer are mixed in a certain ratio and sprayed on the surface of the substrate body. The spraying thickness can satisfy 7-11 μm, for example, the spraying thickness is 9 μm. In one example, the second paint, the curing agent, and the thinner in the first primer satisfy the following ratio: (98-102):(8-12):(250-350), for example, 100:10:300.

[0073] In step S1102, the substrate body with the first primer can be placed in an oven at 60°C for drying treatment. The thickness of the obtained first primer layer can be 7-11 μm, for example, 9 μm.

[0074] In step S1103, the second primer can be a gray primer. The second primer can include a second paint, a curing agent, and a thinner. The second paint can use low-hydroxy acrylic resin and medium-hydroxy acrylic resin. The curing agent can use polyurethane organic solvent, and the thinner can use aliphatic organic solvent.

[0075] In this step, the second primer is continuously sprayed on the surface of the first primer layer away from the body of the substrate. The composition of the second primer can be the same as that of the first primer, and the ratio of the three components can also be the same. For example, the second paint, the curing agent and the thinner in the second primer also satisfy the following ratio: (98-102):(8-12):(250-350), for example, 100:10:300. The second primer with such a ratio is sprayed on the surface of the first primer layer, and the spraying thickness can be 6-10 μm, for example, the spraying thickness is 8 μm.

[0076] In step S1104, the substrate body containing the first primer layer sprayed with the second primer is baked at 60°C. The thickness of the obtained second primer layer can be 6-10 μm, for example, 8 μm.

[0077] In the embodiment of the present disclosure, the substrate body is sprayed in the first pass in step S1101, and the substrate body is sprayed in the second pass in step S1103. The two primer layers effectively cover the polishing marks and ensure that the obtained shell is not heavy due to excessive thickness.

[0078] In one exemplary embodiment, in combination with Figure 1 and Figure 2 In a corresponding embodiment, as shown in Figure 3 the step S120 in the embodiment can include the following steps:

[0079] S1201, spraying a preset color intermediate paint on the surface of the second primer layer.

[0080] S1202, baking the substrate body sprayed with the preset color intermediate paint to obtain a metal color paint layer.

[0081] In step S1201, the preset color intermediate paint is, for example, silver green intermediate paint. The preset color intermediate paint can include a first paint, a curing agent and a thinner. The first paint includes, for example, modified nitrocellulose resin and nitrocellulose resin. It can be understood that the modification of nitrocellulose can be achieved by combining nitrocellulose with alkyd resin to obtain modified nitrocellulose resin. The curing agent can be a polyurethane organic solvent, and the thinner can be an aliphatic organic solvent.

[0082] In one example, the modified nitrocellulose resin and the nitrocellulose resin in the first paint satisfy the following ratio: (90±5):(10±5), for example, 90:10, that is, 90% of the modified nitrocellulose resin and 10% of the ordinary nitrocellulose resin are used in the first paint. The modified nitrocellulose resin has a higher solid content, which is beneficial to improve the strength of the color paint layer and thus improve the reliability of the entire shell. In addition, the solid content in the first paint is (15±5)%, for example, 15%.

[0083] In this step, the three components in the preset color mid-coat are mixed according to a certain ratio, and then sprayed onto the surface of the second base coat layer, that is, the surface of the second base coat layer away from the first base coat layer. The spraying thickness can satisfy 2-6 μm, for example, 4 μm. In one example, the first paint, the curing agent and the diluent in the preset color mid-coat satisfy the following ratio: (98-102):(3-7):(150-250), for example, 100:5:200.

[0084] In step S1202, the substrate body sprayed with the preset color mid-coat is baked at 60°C. The thickness of the color paint layer obtained can be between 2-6 μm, for example, 4 μm.

[0085] In the embodiment of the present disclosure, the substrate body is sprayed for the third time in step S1201. In addition, the first paint in the preset color mid-coat in this embodiment uses modified nitrocellulose resin and nitrocellulose resin, and the solid content is about 15%. Compared with the scheme of using low-hydroxy acrylic resin and nitrocellulose resin (solid content about 30%) as the metal texture layer paint, the color paint layer in this embodiment can achieve better brightness, so that the shell has better luster texture, thereby enhancing the metal texture. Effectively improve the phenomenon that the metal texture effect in the related art is dull and the texture is not strong enough.

[0086] In one example, the first paint, the curing agent and the diluent in the preset color mid-coat satisfy the following ratio: (98-102):(3-7):(150-250), for example, 100:5:200. Figures 1 to 3 Corresponding embodiments, as shown in Figure 4 The step S130 in this embodiment can include the following steps:

[0087] S1301, spraying a transparent UV topcoat on the surface of the color paint layer.

[0088] S1302, baking the substrate body sprayed with the UV topcoat to obtain a transparent protective layer.

[0089] The UV topcoat can include a UV paint, a curing agent, and a diluent. The UV paint can satisfy 2.5-3 spectrophotometer (OD value). The curing agent can be a polyurethane organic solvent. The diluent can be an aliphatic organic solvent. The three components in the UV topcoat can be mixed in a certain ratio, and then sprayed on the surface of the color paint layer. The spraying thickness can be 22-24 μm. In an example, the UV paint, the curing agent, and the diluent can satisfy the following ratio: (23-27):(73-77):(30-50), for example, 25:75:40.

[0090] In step S1302, the substrate body sprayed with the UV topcoat is baked at 55°C. The thickness of the transparent protective layer obtained can be between 22-24 μm.

[0091] In the embodiment of the present disclosure, the substrate body is sprayed for the fourth time in step S1301. The thickness of the transparent protective layer is controlled within 24 μm, so as to effectively transmit the metallic texture of the color paint layer or the preset color middle paint. In the embodiment, the transparent protective layer cooperates with the color paint layer. The transparent protective layer not only has a certain thickness to achieve the protection effect and improve the reliability of the color paint layer, but also avoids being too thick to block the luster of the color paint layer and ensure the maximum transmission of the metallic texture of the color paint layer.

[0092] In combination with Figures 1 to 4 In the corresponding embodiment, the substrate body is sprayed for four times in the embodiment of the present disclosure: the substrate body is sprayed for the first time in step S1101, the second time in step S1103, the third time in step S1201, and the fourth time in step S1301. The first shell shown in Figure 6 In combination with Figure 6 the orientation, the substrate body 10 starts from the surface of the substrate body 10 and forms the primer layer 20, the color paint layer 30, and the transparent protective layer 40 in the direction away from the substrate body 10, wherein the primer layer 20 includes the first primer layer 21 and the second primer layer 22. Thus, in the embodiment of the present disclosure, the bright and lustrous metallic texture effect can be achieved based on the spraying method and the spraying component system, and the metallic texture can be strengthened.

[0093] In the processing process of the terminal equipment production line system, the four spraying processes involved in the embodiment of the present disclosure can be performed on multiple substrate bodies at the same time. For example, five substrate bodies are hung and then sent into the spraying production line at the same time, and the five substrate bodies are simultaneously subjected to the four spraying processes of the above embodiment.

[0094] In an exemplary embodiment, the present disclosure also proposes a preparation method of a shell. The method of the present embodiment can include Figures 1 to 4 any one or more of the illustrated embodiments.

[0095] As Figure 5 illustrated, the method of the present embodiment may, for example, include the following steps:

[0096] S510, applying a primer layer on the polished surface of the substrate body.

[0097] S520, applying a metallic color paint layer on the surface of the primer layer away from the substrate body.

[0098] S530, applying a transparent protective layer on the surface of the color paint layer away from the primer layer to obtain a first shell.

[0099] S540, printing a character pattern on the surface of the transparent protective layer in the first shell to obtain a second shell.

[0100] The embodiments of steps S510 to S530 can refer to the embodiments of steps S110 to S130 in the foregoing embodiments, and will not be described here.

[0101] In step S540, after obtaining the first shell, the first shell after spray baking can be cleaned to remove dirt. In this step, the character pattern can be printed on the surface of the transparent protective layer by pad printing.

[0102] In the present embodiment, the printing method is used to effectively obtain the character pattern and improve the reliability of the character pattern. In combination with the foregoing description in the foregoing embodiments, the solid content of the first paint in the color paint layer is lower in the present embodiment, and if the laser engraving method is used, the reliability of the obtained character pattern will be lower. In the present embodiment, the pad printing scheme is used to replace the laser engraving process to obtain a more reliable character pattern, as described in the following examples.

[0103] In one example, step S540 can include the following steps:

[0104] S5401, printing a character pattern on the surface of the transparent protective layer by pad printing.

[0105] S5402, performing a drying treatment on the first shell with the printed character pattern.

[0106] S5403, performing UV cold light curing on the first shell after the drying treatment to obtain a second shell.

[0107] In step S5401, pad printing can be achieved by means of a pad printing machine, the first shell and a pad printing rubber head are respectively assembled on the pad printing machine, and an assembly containing a pad printing pattern is installed, and the pad printing pattern on the assembly is pad printed onto the transparent protective layer of the first shell. Step S5401 may, for example, include the following steps:

[0108] S5401-1, a substrate with a character pattern is prepared. In this step, the substrate with a character pattern is the component with a pattern for pad printing described above. The substrate can be a steel plate, and the character pattern can be a logo pattern required by a terminal equipment manufacturer.

[0109] S5401-2, pad printing ink is injected into the character pattern on the substrate. In this step, the pad printing ink includes ink and curing agent. The ratio of ink and curing agent can be adjusted in advance. After the ink is selected, 15% of the curing agent is added to form the pad printing ink. The pad printing ink is injected into the character pattern groove on the steel plate. The ink is selected, for example, TUS-58565, and the curing agent is selected, for example, TUS-067C.

[0110] S5401-3, the pad printing ink in the character pattern is pad printed to the surface of the transparent protective layer. In this step, the pad printing ink in the character pattern can be absorbed by the pad printing rubber head of the pad printing machine and pad printed to the surface of the transparent protective layer. The hardness of the pad printing rubber head can be 36. In this step S5401-3, the following implementation can be used: the pad printing ink is absorbed by the pad printing rubber head at least twice, and the pad printing ink absorbed each time is pad printed to the surface of the transparent protective layer. In this way, the thickness of the pad printing ink or the ink on the first shell is deepened, so that the intensity of the character pattern on the first shell is deepened. For example, the pad printing ink can be absorbed twice to ensure the thickness while avoiding that the character pattern is too thick to affect the overall effect. The thickness of the pad printing ink or the ink is about 18 μm.

[0111] In step S5402, the first shell printed by the above step S5401 is placed in an oven, and baked at 80°C for 60 minutes to dry the moisture in the character pattern obtained by pad printing.

[0112] In step S5403, the first shell dried by step S5402 is transmitted to a UV curing line, and the first shell is subjected to UV cold light curing by using a cold light UV instrument, so as to obtain a second shell. In this step, the line speed of the UV curing line is 10 meters / minute, the distance between the UV lamp and the first shell is about 10 centimeters, and the energy of the UV lamp is controlled to be 4500-5500 mw / cm2 (light irradiance unit), so as to realize cold curing of the pad printing ink or the ink.

[0113] In the embodiments of the present disclosure, the shell with bright metal texture and character effect can be obtained by steps S510 to S540, the metal texture is good, and the character pattern has high reliability. The reliability of the character pattern can be effectively improved by twice pad printing of the pad printing ink and UV cold light curing, and the character pattern effect remains good after vibration wear test (8H stone) and alcohol resistance test. It is worth noting that when the pad printing ink is cured by other curing methods, the reliability of the character pattern is low and the character pattern is damaged during the test.

[0114] In one exemplary embodiment, the present disclosure also provides a shell, which is prepared by Figures 1 to 4 a corresponding preparation method of the shell. The hierarchical structure can refer to Figure 6 the description of the foregoing embodiments, and the preparation method and appearance characteristics can refer to the description of the foregoing embodiments, which will not be described here again.

[0115] In one exemplary embodiment, the present disclosure also provides a shell, which is prepared by Figures 1 to 5 a corresponding preparation method of the shell. The preparation method and appearance characteristics can refer to the description of the foregoing embodiments, which will not be described here again.

[0116] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0117] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. A method for producing a case, characterized by, The application relates to a shell manufacturing method. The method comprises the following steps: taking a die-casting aluminum plate as a main body structure of a middle frame, performing injection molding on the die-casting aluminum plate, processing a plastic frame in the circumferential direction of the die-casting aluminum plate and processing a plastic back shell on the back surface of the die-casting aluminum plate; The plastic part of the middle frame is polished to remove the parting line, and a base body is obtained; A primer layer is coated on the polished surface of the base body to cover the polishing marks; wherein the primer layer is formed by performing first spray forming on the base body and then performing second spray forming on the base body; A color paint layer with a metallic texture is coated on the surface of the primer layer away from the base body to achieve a metallic texture effect; A transparent protective layer is coated on the surface of the color paint layer away from the primer layer to show the metallic texture color, and the shell is prepared.

2. The method of producing a case according to claim 1, wherein The color paint layer with a metallic texture is coated on the surface of the primer layer away from the base body, and the color paint layer with a metallic texture is obtained by the following steps: A preset color intermediate paint is sprayed on the surface of the primer layer; The base body sprayed with the preset color intermediate paint is subjected to drying treatment, and the color paint layer with a metallic texture is obtained. The preset color intermediate paint comprises a first paint, and the first paint comprises modified nitrocellulose resin and nitrocellulose resin.

3. The method of producing a case according to claim 2, wherein The preset color intermediate paint further comprises a curing agent and a diluent, and the first paint, the curing agent and the diluent in the preset color intermediate paint satisfy the following ratio: (98-102):(3-7):(150-250).

4. The method of producing a case according to claim 2, wherein The thickness of the color paint layer is 2-6 mu m.

5. The method of producing a case according to claim 2, wherein The modified nitrocellulose resin and the nitrocellulose resin in the first paint satisfy the following ratio: (90+ / -5):(10+ / -5).

6. The method of producing a case according to claim 2, wherein The solid content of the first paint is (15+ / -5) %.

7. The method of producing a case according to claim 1, wherein The transparent protective layer is coated on the surface of the color paint layer away from the primer layer, and the transparent protective layer is obtained by the following steps: A transparent UV topcoat is sprayed on the surface of the color paint layer; The base body sprayed with the UV topcoat is subjected to drying treatment, and the transparent protective layer is obtained.

8. The method of producing a case according to claim 7, wherein The UV topcoat comprises a UV paint, a curing agent and a diluent, and the UV paint, the curing agent and the diluent satisfy the following ratio: (23-27):(73-77):(30-50).

9. The method of producing a case according to claim 7, wherein The thickness of the transparent protective layer is 22-24 mu m.

10. The method of producing a case according to claim 1, wherein The primer layer is coated on the polished surface of the base body, and the primer layer is obtained by the following steps: A first primer is sprayed on the polished surface of the base body; The base body sprayed with the first primer is subjected to drying treatment, and a first primer layer is obtained; A second primer is sprayed on the surface of the first primer layer; The base body sprayed with the second primer is subjected to drying treatment, and a second primer layer is obtained.

11. The method of producing a case according to claim 10, wherein The second paint in the first primer and / or the second primer is low-hydroxy acrylic resin and medium-hydroxy acrylic resin.

12. The method of producing a case according to claim 10, wherein The first primer and the second primer both comprise a second paint, a curing agent and a diluent, and the second paint, the curing agent and the diluent satisfy the following ratio: (98-102):(8-12):(250-350).

13. The method of claim 10, wherein the shell is prepared by a process comprising: The thickness of the first primer layer is 7-11 mu m, and the thickness of the second primer layer is 6-10 mu m.

14. The method of producing a case according to any one of claims 3, 8 or 12, characterized by, The curing agent comprises a polyurethane organic solvent, and the diluent comprises an aliphatic organic solvent.

15. A method of producing a case, characterized by, Comprise: A preparation method of the shell according to any one of claims 1 to 14, to obtain a first shell; Printing a character pattern on the surface of the transparent protective layer in the first shell, to obtain a second shell.

16. The method of claim 15, wherein The printing of the character pattern on the surface of the transparent protective layer in the first shell, to obtain a second shell, comprises: Printing the character pattern on the surface of the transparent protective layer by pad printing; Performing a drying treatment on the first shell on which the character pattern is printed; Performing UV cold light curing on the first shell after the drying treatment, to obtain the second shell.

17. The method of claim 16, wherein the shell is prepared by The printing of the character pattern on the surface of the transparent protective layer by pad printing, comprises: Preparation of a substrate with a character pattern engraved thereon; Injecting pad printing paint into the character pattern on the substrate; wherein the pad printing paint comprises ink and a curing agent; Pad printing the pad printing paint in the character pattern onto the surface of the transparent protective layer.

18. The method of claim 17, wherein the shell is prepared by a process comprising: The pad printing of the pad printing paint in the character pattern onto the surface of the transparent protective layer, comprises: Sucking the pad printing paint in the character pattern at least twice, and pad printing the pad printing paint sucked each time onto the surface of the transparent protective layer.

19. A housing characterized by, Obtained by the preparation method of the shell according to any one of claims 1 to 14, or obtained by the preparation method of the shell according to any one of claims 15 to 18.

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