CN112299858A

CN112299858A - Preparation method of shell, shell and mobile terminal

Info

Publication number: CN112299858A
Application number: CN201910676182.7A
Authority: CN
Inventors: 赵岩峰
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2021-02-02

Abstract

The application relates to a preparation method of a shell, the shell and a mobile terminal, wherein the preparation method of the shell comprises the following steps: obtaining a ceramic or glass substrate; partially shielding the surface of the substrate to define a shielded area and an unmasked area on the surface of the substrate, wherein the unmasked area is positioned on the outer surface of the substrate; and sandblasting the unmasked area of the surface of the substrate by using a sandblasting medium, wherein the unmasked area of the surface of the substrate forms micron-scale pores. According to the preparation method of the shell, the shell and the mobile terminal, the anti-skid performance of the shell is improved by utilizing the pores formed on the surface of the base material, so that the mobile terminal is prevented from being damaged by falling easily.

Description

Preparation method of shell, shell and mobile terminal

Technical Field

The present application relates to the field of mobile terminal technologies, and in particular, to a method for manufacturing a housing, and a mobile terminal.

Background

The ceramic has the properties of high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and the like, is used as a structural member of a mobile terminal such as a mobile phone, a tablet personal computer and the like, is widely applied to a shell structure such as a rear cover, a middle frame and the like, and is popular with consumers.

In order to prevent the camera from protruding, an embedded camera is adopted at present, and sapphire or a camera lens is embedded on the surface of a rear cover. For preventing that camera lens or sapphire from polishing the flower and influencing the image effect, set up the abrasionproof arch of lid surface behind the protrusion in the place that the surface of lid is close to the camera usually to utilize the protruding support mobile terminal of abrasionproof, thereby prevent camera lens and desktop contact.

However, utilize the protruding support mobile terminal of abrasionproof, prevent the platform large tracts of land contact such as casing and desktop, though can reduce the camera lens by the probability of rubbing flowers, but to the casing that adopts ceramic material preparation, because ceramic material's surface is very smooth, mobile terminal follows the platform landing such as desktop easily, the bellied support of abrasionproof leads to the contact surface of platforms such as casing and desktop to be littleer, the risk of this kind of landing has aggravated more, lead to mobile terminal to fall impaired easily, furthermore, ceramic material's casing can obtain better gripping at present and feel, but also easy slippage and drop impaired.

Disclosure of Invention

In order to solve the problem that a mobile terminal is easy to drop and damage, the embodiment of the application provides a preparation method of a shell, the shell and the mobile terminal comprising the shell.

In one aspect, the present application provides a method for preparing a housing, including the steps of:

obtaining a ceramic or glass substrate;

locally shielding the surface of the substrate to define a shielded area and an unmasked area on the surface of the substrate, wherein the unmasked area is positioned on the outer surface of the substrate;

and blasting the unmasked area of the surface of the substrate by using a blasting medium to form micron-scale pores in the unmasked area of the surface of the substrate.

In one embodiment, after micron-sized pores are formed in the unmasked area of the surface of the substrate, the surface roughness is Ra 10-500 μm.

In one embodiment, the step of locally masking the surface of the substrate comprises:

locally masking different locations of the surface of the substrate to define unmasked areas at the different locations of the surface of the substrate.

In one embodiment, in the step of blasting the unmasked area of the surface of the substrate with the blasting medium, the unmasked area defined at different positions is blasted with different parameters.

In one embodiment, in the step of blasting the unmasked area of the surface of the substrate with the blasting medium, the parameters adopted by the blasting action include blasting time and blasting times; the sand blasting time is 2-10 minutes; the sand blasting times are N, and N is a positive integer greater than or equal to 1.

In one embodiment, the sand blasting medium is selected from at least one of alumina sand, silicon carbide sand or glass beads, the sand blasting medium is in a spherical particle shape, and the particle size of the sand blasting medium is 100-500 μm.

In one embodiment, the moisture content of the blasting media is less than 0.05%.

In one embodiment, in the step of blasting the unmasked area of the surface of the substrate with the blasting medium, the blasting medium is ejected by a blasting machine and is made to impact the unmasked area of the surface of the substrate; the pressure of the air storage tank of the sand blasting machine is 0.10 MPa-0.20 MPa, and in the sand blasting process, the air is filtered and dehumidified.

In one embodiment, the step of locally masking the surface of the substrate to define masked and unmasked regions on the surface of the substrate comprises:

covering the shielding jig on the surface of the substrate, wherein the part of the surface of the substrate covered with the shielding jig defines the shielding area, and the rest part defines the non-shielding area.

In one embodiment, after the step of blasting the unmasked area of the surface of the substrate with the blasting medium, the method further comprises a post-treatment step of:

removing the masking jig from the substrate;

and cleaning the substrate with the shielding jig removed.

shielding the part of the surface of the base material, which needs to be subjected to sand blasting, by adopting a shielding piece;

spraying ink on the base material shielded by the shielding piece to form an ink shielding layer covering the surface of the base material, wherein the part of the surface of the base material covered with the ink shielding layer defines a shielding area;

removing the shutter from the substrate so as to expose the portions of the surface of the substrate that are to be sandblasted and to define the unmasked areas.

removing the ink shielding layer covered on the surface of the substrate;

and cleaning the substrate with the ink shielding layer removed.

In another aspect, the present application provides a shell prepared by the above shell preparation method.

In another aspect, the present application provides a housing comprising a ceramic or glass substrate having micron-sized pores on an outer surface thereof.

In one embodiment, the housing comprises a middle frame or a rear cover, or the housing is of an integrally-molded structure.

In still another aspect, the present application provides a mobile terminal including the above-mentioned housing.

According to the preparation method of the shell, the shell and the mobile terminal, the anti-skid performance of the shell is improved by utilizing the pores formed on the surface of the base material, so that the mobile terminal is prevented from being damaged by falling easily.

Drawings

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

Fig. 1 is a schematic perspective view of a mobile terminal according to an embodiment;

fig. 2 is a rear view schematic diagram of the mobile terminal shown in fig. 1;

FIG. 3 is a schematic diagram illustrating the contact of the housing with the platform when the mobile terminal with the anti-wear protrusions is placed on the platform;

fig. 4 is a schematic flowchart illustrating steps of a method for manufacturing a housing of a mobile terminal according to an embodiment;

FIG. 5 is a flow chart illustrating a process of obtaining a substrate according to one embodiment of a method of manufacturing a housing;

fig. 6 is a flowchart illustrating a step of partially shielding a surface of a substrate in a method for manufacturing a housing according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As used herein, a "mobile terminal" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following:

(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;

(2) via a Wireless interface means such as a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter.

A mobile terminal arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

(1) satellite or cellular telephones;

(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;

(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;

(4) conventional laptop and/or palmtop receivers;

(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.

As shown in fig. 1 and fig. 2, in an embodiment, a mobile terminal 10 is provided, where the mobile terminal 10 may be a smart phone or a tablet computer, and is not limited herein.

The mobile terminal 10 includes a housing 100 and a display screen assembly 200. The housing 100 and the display screen assembly 200 are connected to form an accommodating space, and a main board, a power supply and other components of the mobile terminal 10 are disposed in the accommodating space. The mainboard is integrated with electronic elements such as a controller, a storage unit, a power management unit, a baseband chip and the like.

The housing 100 may be made of ceramic or glass.

The housing 100 has various structural forms. For example, in some embodiments, the housing 100 is a middle bezel of the mobile terminal 10, or the housing 100 is a rear cover of the mobile terminal 10. In other embodiments, the housing 100 may also be an integrally formed fuselage (unibody) structure, specifically, the middle frame and the rear cover are integrally formed. Taking the case 100 made of ceramic material as an example, the case 100 is an integrally formed structure of a ceramic middle frame and a ceramic rear cover. Accordingly, when the casing 100 is made of glass, the casing 100 may be a glass middle frame and a glass rear cover integrally molded. Of course, in other embodiments, the housing 100 may be integrally formed of a ceramic material and a glass material. For example, the housing 100 is formed by integrally molding a ceramic center frame and a glass rear cover, or the housing 100 is formed by integrally molding a glass center frame and a ceramic rear cover. A part of the middle frame of the casing 100 may be made of ceramic, and another part of the middle frame may be made of glass. Accordingly, a part of the rear cover of the housing 100 may be made of ceramic, and another part of the rear cover may be made of glass, which is not described in detail herein.

The Display screen assembly 200 uses an LCD (Liquid Crystal Display) screen for displaying information, and the LCD screen may be a TFT (Thin Film Transistor) screen, an IPS (In-Plane Switching) screen, or an SLCD (split Liquid Crystal Display) screen.

In another embodiment, the display panel assembly 200 employs an OLED (Organic Light-Emitting display) panel for displaying information, and the OLED panel may be an AMOLED (Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED (Super Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED Plus (Super Active Matrix Organic Light-Emitting Diode) screen. Under the control of the controller, the display screen assembly 200 can display information and can provide an operation interface for a user.

With continued reference to fig. 1 and 2, the mobile terminal 10 is provided with an anti-wear protrusion 11 protruding from an outer surface 101 of the housing 100, specifically, the anti-wear protrusion 11 is located on a surface of the mobile terminal 10 on a side where the rear camera 12 is located, that is, a surface exposed when the housing 100 is mounted on the mobile terminal 10 and viewable by a user. Therefore, the anti-abrasion protrusions 11 are used as supporting points of the mobile terminal 10, the direct contact area of the mobile terminal 10 and the placement platforms C such as the desktop is reduced, and the anti-abrasion protrusions 11 can play a good anti-abrasion effect on the shell 100 and the camera lens.

Fig. 3 schematically illustrates a case 100 in contact with a platform C, such as a desktop, when the mobile terminal 10 having the wear-resistant protrusions 11 is placed on the platform C. As can be seen from fig. 3, the wear-resistant protrusions 11 support the mobile terminal 10, and the contact surface between the mobile terminal 10 and the platform C is small, for the case 100 made of ceramic or glass, the smooth surface of the case 100 may cause the mobile terminal 10 to easily slip off the platform C and fall off.

It should be noted that even if the mobile terminal 10 does not use the wear-resistant protrusion 11, the ceramic case 100 itself is too smooth and is easily slipped and damaged when being held.

Accordingly, the present application provides a casing 100, which includes a ceramic or glass substrate, and the outer surface of the substrate has micron-sized pores, so that the micron-sized pores are utilized to enhance the friction performance of the surface of the casing 100, thereby preventing the casing from slipping.

In another aspect of the present application, a method for manufacturing the housing 100 is provided, as shown in fig. 4, the method for manufacturing the housing 100 includes the following steps:

step S102, a ceramic or glass substrate is obtained.

The base material may be prepared by an upstream manufacturer, or may be processed and formed in a flow-down manner, and then enter a subsequent processing step to improve the processing efficiency of the housing 100.

Step S104, the surface of the substrate is partially masked to define a masked region and an unmasked region on the surface of the substrate, and the unmasked region is located on the outer surface of the substrate.

The outer surface of the substrate refers to the surface that is exposed when the housing 100 is mounted to the mobile terminal 10. The masked area and the unmasked area are referred to whether the surface of the substrate is masked, specifically, the area corresponding to the masked part of the surface of the substrate is the masked area, and the area corresponding to the unmasked part is the unmasked area. The unmasked area is arranged on the outer surface of the substrate, so that other parts of the surface of the substrate can be prevented from being masked and not exposed, and the subsequent sand blasting processing can be carried out.

Step S106, sand blasting is carried out on the unmasked area of the surface of the base material by using a sand blasting medium, so as to form micron-scale pores in the unmasked area of the surface of the base material.

It should be noted that, in this embodiment, since the unmasked region is used as the region to be subjected to subsequent sand blasting, and the unmasked region is disposed on the outer surface of the substrate, it can be ensured that only the corresponding region of the outer surface of the substrate is subjected to sand blasting to form micron-sized pores, so as to enhance the surface roughness, thereby meeting the requirement of improving the anti-slip effect of the surface of the housing 100. The pores formed by the surface of the substrate upon impact with the blasting medium can be considered as depressions of the granulations impacted by the blasting medium impacting the surface of the substrate, thereby achieving a roughening of the impacted surface.

In some embodiments, the unmasked areas of the surface of the substrate have a surface roughness of Ra 10-500 μm after forming micro-scale voids. In this way, the surface gripping effect of the housing 100 can be improved by using the portion of the surface of the substrate where the aperture is processed, so as to prevent the mobile terminal 10 from being damaged by dropping. Meanwhile, the surface roughness is controlled to Ra 10-500 μm, which does not affect the overall aesthetic feeling of the surface of the housing 100 and maintains the overall appearance texture of the mobile terminal 10.

For convenience of description, a portion where an unmasked region of the surface of the base material is subjected to blasting to form pores is simply referred to as a "blasted portion". That is, the surface of the base material is subjected to sandblasting, and then a sandblasted portion is formed. As can be appreciated, the grit blasted portion corresponds to an unmasked area.

For example, as shown in fig. 2 and 3 in combination, in some embodiments, the shell 100 is apertured proximate the lower edge 13 by sandblasting, that is, the sandblasted portion 102 is located proximate the lower edge 13 of the shell 100. Therefore, when the mobile terminal 10 provided with the anti-abrasion protrusion 11 is placed on a platform C such as a desktop, the anti-abrasion protrusion 11 supports the mobile terminal 10 on the platform C such as the desktop, and the sand blasting portion 102 contacts with the platform C to provide a larger friction force by using the sand blasting portion 102, so that the mobile terminal 10 is prevented from slipping easily.

In some embodiments, the portion to be sandblasted, i.e., the unmasked area, is adaptively exposed by appropriately arranging the masked area of the surface of the housing 100, so that the sandblasted portion 102 is formed at the corresponding position after sandblasting. By such a processing manner, the sand blasting portion 102 may be formed on the side circumferential surface of the housing 100 of the mobile terminal 10, so that when the user holds and uses the mobile terminal 10, the user holds the sand blasting portion 102 on the side circumferential surface with fingers to provide increased friction to prevent the mobile terminal 10 from being damaged due to easy slipping.

In other embodiments, the sandblasting portion 102 may also be disposed on a surface of the housing 100 facing away from the display screen 200. The surface of the housing 100 on the side opposite to the display screen 200 is provided with a larger area for sand blasting while the sand blasting part 102 provides a better anti-slip effect, so that the sand blasting part 102 with a larger breadth is obtained, and a better surface decoration effect is obtained, so that the mobile terminal 10 equipped with the housing 100 has richer appearance texture.

In some embodiments, in step S106, i.e., the step of blasting the unmasked areas of the surface of the substrate with blasting media, the parameters used include the blasting time and the number of blasting times; the sand blasting time is 2-10 minutes; the number of sandblasting is N, which is a positive integer of 1 or more, that is, sandblasting may be performed once or a plurality of times.

When the surface of the base material is subjected to the blast processing a plurality of times, the positions of the blast processing may be different or the same.

In some embodiments, the positions of the multiple times of sand blasting are the same, that is, the sand blasting is repeated on the same position of the surface of the substrate, so that when the multiple times of sand blasting are performed, the sand blasting medium impacts the surface of the substrate to form a superposition effect, so that the surface roughness of the substrate subjected to the sand blasting meets the design requirement, and meanwhile, by using the mode, the sand blasting parts 102 with different surface roughness can be processed to realize the differentiated appearance effect.

In some embodiments, the multiple grit blasting operations are performed at different locations, i.e., different locations on the surface of the substrate are desired to be grit blasted. Specifically, the step of locally masking the surface of the base material in step S104 includes: the method includes partially masking different locations of a surface of the substrate to define unmasked regions at the different locations of the surface of the substrate. Therefore, the unmasked regions can be defined at different positions on the surface of the substrate, and after the unmasked regions are subjected to sand blasting, the corresponding sand blasting portions 102 are formed corresponding to the unmasked regions at the different positions. That is, in this way, it is possible to accommodate the need to machine a plurality of sandblasted portions 102 on the surface of the base material. Since the positions of the blasting are different, the positions of the blasting portions 102 are different.

Further, in step S106, in which the unmasked area of the surface of the substrate is blasted with the blasting medium, the unmasked area defined at different positions is blasted with different parameters. Because the surfaces of the substrates corresponding to the unmasked areas defined at different positions are different, after the sandblasting process is performed by adopting different parameters, the surface structures and the gloss of the sandblasted portions 102 of the unmasked areas defined at the different positions corresponding to the surfaces of the substrates are different, and therefore, through the mode, the gradual effect can be formed by multiple sandblasting, so that the surface texture of the shell 100 is improved.

It should be noted that, the region of sandblast processing is different many times, can be through the reasonable position that sets up the surface of carrying out local shielding to the substrate, make the non-shielding region that forms have partial overlap, thereby when processing through the sandblast, the region of sandblast processing also has partial overlap, the part that overlaps will be impacted by the sandblast medium because of repetition and form the hole of different specifications, and then obtain different surface roughness, relative other non-overlapping parts, the outward appearance effect has obvious difference, with the surperficial differentiation processingquality of effective promotion casing 100.

In some embodiments, the blasting media is selected from at least one of alumina sand, silicon carbide sand, or glass beads, the blasting media being in the form of spherical particles, the blasting media having a particle size of 100 μm to 500 μm. The sand blasting medium is spherical particles with the particle size of 100-500 mu m, so that the substrate can be prevented from being scratched by impact due to edges and corners of the sand blasting medium, and large-size pits caused by the fact that pores formed by the sand blasting medium on the surface of the substrate are not easy to control are avoided.

When the surface of the base material is blasted with blasting media having different particle sizes, the blasting time can be adjusted adaptively so that the blasted part 102 having a suitable surface roughness can be formed on the surface of the base material.

For example, when the particle size of the blasting medium is 100 μm, the blasting time may be controlled to 10 minutes so that a sufficient amount of the blasting medium impacts the unmasked region of the surface of the substrate, and the surface roughness of the surface of the substrate after the formation of the micro-scale pores is controlled to Ra10 to 500 μm.

For another example, when the particle size of the blasting medium is 500 μm, the blasting time is not too long under the impact of the blasting medium with a larger particle size, and the blasting time is controlled to be 2 minutes, so that the surface roughness of the surface of the substrate after the micron-sized pores are formed can be controlled to be Ra10 to 500 μm according to the surface blasting requirement of the substrate.

In some embodiments, when the particle size of the blasting medium is 300 μm, the particle size of the blasting medium is moderate, and the blasting time is controlled to be 6 minutes, which is beneficial to controlling the surface roughness of the surface of the substrate after the micron-sized pores are formed to be Ra 10-500 μm.

The moisture content of the blasting media is less than 0.05%. So that the blasting medium is kept dry, which is beneficial to the impact stability of the blasting medium to the surface of the substrate, and more uniform pores are obtained, and the surface texture of the shell 100 is improved.

In some embodiments, in step S106, i.e., the step of blasting the unmasked region of the surface of the substrate with the blasting medium, the blasting medium is ejected by a blasting machine and is caused to impact the unmasked region of the surface of the substrate; the pressure of the air storage tank of the sand blasting machine is 0.10 MPa-0.20 MPa.

Through controlling the pressure of the gas storage tank of the sand blasting machine, in the sand blasting process, the compressed gas can provide enough sand blasting force for the sand blasting medium and prevent the sand blasting medium from being overlarge, so that the sand blasting medium can impact the surface of the base material with proper impact force, cracking of the base material caused by overlarge impact force is avoided, or pores cannot be stably formed on the surface of the base material due to the fact that the impact force is too small.

In the sandblasting process, the gas is filtered and dehumidified to avoid the influence of moisture on the sandblasting stability of the sandblasting medium or the influence of moisture on the surface impact stability of the substrate due to the adhesion phenomenon of the sandblasting medium.

In some embodiments, as shown in fig. 5, step S102, namely, the step of obtaining the substrate, includes:

step S1021, mixing 70-99 parts by weight of ceramic or glass raw material powder and 1-30 parts by weight of binder to obtain slurry.

Weighing 70-99 parts by weight of raw material powder, and mixing the raw material powder with 1-30 parts by weight of binder. In the process of mixing, can be through the mode of stirring for raw materials powder is more even to be melted into the binder, and then obtains the thick liquids more even, so that each part of the structure that forms in the subsequent technology process has same structural strength, avoids mixing inhomogeneous and lead to the processing structure local stress to appear.

The binder is selected from one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate and polyformaldehyde.

In step S1022, the slurry is formed by injection molding, casting, or dry press molding to obtain a green body.

And step S1023, performing degumming and degreasing on the green body to remove organic components.

And (3) placing the green body into a glue discharging box for glue discharging or degreasing, wherein the glue discharging or degreasing temperature is controlled below 400 ℃, and the time is controlled to be 0.5-4 h. After the glue is removed or degreased, the product has no problems of distortion, cracking, heterochrosis and the like.

And step S1024, sintering the green body subjected to binder removal and degreasing in a reducing or oxidizing or inert atmosphere, wherein the sintering temperature is controlled to be over 1200 ℃, and the sintering time is controlled to be 0.5-10 h, so as to obtain a sintered body.

And step S1025, performing CNC machining, grinding and polishing on the sintered blank to obtain the base material.

In the embodiment, the blank prepared under the technological parameters of the glue discharging and degreasing can reach the states of minimum air holes, maximum shrinkage rate, most compact product and best performance.

When the raw material powder is used as a raw material, the raw material powder may include alumina powder, zirconia powder or zirconium nitride powder, or a mixture thereof, and the powder purity is 99.99% or more.

It should be noted that, in some embodiments, before the step S104 of locally shielding the surface of the substrate, a step of degreasing the surface of the substrate is further included:

and soaking the base material in a low-alkaline solution, wherein the pH value of the low-alkaline solution is 9-12.

The grease on the surface of the base material is cleaned by using the low-alkaline solution, and the low-alkaline solution has small corrosion on the surface of the base material, so that the surface structure of the base material is prevented from being damaged. In addition, the low-alkaline solution can be used at low temperature and medium temperature, and the grease removing efficiency is high.

The low-alkaline solution comprises the components of inorganic low-alkaline auxiliary agent, surfactant and defoaming agent.

In some embodiments, the inorganic low-alkalinity aid is selected from one or more of sodium silicate, sodium tripolyphosphate, sodium phosphate, sodium carbonate. The inorganic low-alkalinity auxiliary agent is used for providing a certain alkalinity to obtain a dispersed suspension effect, and the removed grease is suspended on the surface of the solution, so that the stripped grease is prevented from being adsorbed on the surface of the base material again.

The surfactant is nonionic and anionic surfactant or polyvinyl chloride OP and sulfonate surfactant. The surfactant is utilized to enhance the activity of the grease, so that the grease is easier to separate from the base material, and a better cleaning effect is obtained.

In some embodiments, a surface conditioner may also be added to remove surface oils from the substrate to provide a dual degreasing and surface conditioning effect.

In some embodiments, the solubility parameters of the inorganic low-alkalinity adjunct are as follows:

4-10g/L of sodium tripolyphosphate, 0-10g/L of sodium silicate, 4-10g/L of sodium carbonate, 0-3.0g/L of defoaming agent, 0-3g/L of surface conditioning agent, 5-20 points of free alkalinity, normal temperature-80 ℃ and treatment time of 5-20 min.

After the inorganic low-alkaline auxiliary agent with the solubility parameter is adopted to clean the base material, the surface of the base material is free of grease and is relatively clean, so that the subsequent shielding and sand blasting operations on the surface of the base material are facilitated.

In some embodiments, the step S104 of locally masking the surface of the substrate to define a masked region and an unmasked region on the surface of the substrate includes:

covering the shielding jig on the surface of the substrate, wherein the part of the surface of the substrate covered with the shielding jig defines a shielding area, and the rest part defines an unshielded area.

The masking jig may be a film made of transparent PET (Polyethylene terephthalate). In another embodiment, the shielding fixture may be made of PO (polyolefin), a-PET (Amorphous Polyethylene Terephthalate), PETG (Polyethylene Terephthalate-1, 4-cyclohexanedimethanol), PC (Polycarbonate), PMMA (Polymethyl methacrylate), or the like.

Further, step S106, after the step of blasting the unmasked area of the surface of the substrate with the blasting medium, further includes a step of post-treatment:

removing the masking jig from the substrate.

And cleaning the substrate with the shielding jig removed.

After this post-treatment process, the resulting housing 100 is relatively clean and tidy for use. It should be noted that when cleaning the substrate, ionized water ultrasonic waves can be used to obtain a better cleaning effect. After the cleaning, the surface of the housing 100 may be baked in an oven to remove water stains.

In another embodiment, as shown in fig. 6, the step S104 of performing a local masking on the surface of the substrate to define a masked area and an unmasked area on the surface of the substrate includes:

step S1042, a shielding piece is adopted to shield the part of the surface of the base material needing sand blasting.

Step S1044 is to spray ink on the substrate covered by the shielding member to form an ink shielding layer covering the surface of the substrate, wherein the portion of the surface of the substrate covered by the ink shielding layer defines a shielding area.

In step S1046, the mask is removed from the substrate, so that the portion of the surface of the substrate that needs to be sandblasted is exposed and an unmasked area is defined.

According to the method, the position needing sand blasting can be conveniently shielded by the shielding piece, so that when ink is sprayed, the part, shielded by the shielding piece, of the base material cannot be sprayed and covered, and only the other positions, which are not needed to be subjected to sand blasting and not shielded by the shielding piece, are sprayed and covered with the ink, so that the ink shielding layer is formed. And then in the follow-up sandblast course of working, the printing ink shields the position that will not need the sandblast and shelters from to avoid sandblast medium to strike the position that does not need the sandblast. Further, by this processing method, the sandblasted portion 102 having a relatively uniform edge can be obtained on the case 100, and the case 100 can maintain a good overall aesthetic appearance without causing an edge burr phenomenon.

The shielding piece can be a plastic shielding jig or a shielding jig made by using a mold. Only when the ink is sprayed, the ink can be prevented from being sprayed to the position of the substrate where the sand blasting processing is not needed.

removing the ink shielding layer covered on the surface of the base material;

and cleaning the substrate with the ink shielding layer removed.

After this post-treatment process, the resulting housing 100 is relatively clean and tidy for use.

It should be noted that, the ink shielding layer may be dissolved and cleaned by a solvent, and then the substrate from which the ink shielding layer is removed may be further cleaned by ultrasonic cleaning, so as to obtain a better cleaning effect. After the cleaning, the surface of the housing 100 may be baked in an oven to remove water stains.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for preparing a shell is characterized by comprising the following steps:

obtaining a ceramic or glass substrate;

2. The method for manufacturing the shell according to claim 1, wherein the unmasked area of the surface of the substrate is formed with micron-sized pores, and the surface roughness is Ra 10-500 μm.

3. The method of manufacturing a housing according to claim 1, wherein the step of partially masking the surface of the substrate includes:

4. The method for manufacturing a housing according to claim 3, wherein in the step of blasting the unmasked area of the surface of the substrate with the blasting medium, the unmasked area defined at different positions is blasted with different parameters.

5. The method for manufacturing a housing according to any one of claims 1 to 4, wherein in the step of blasting the unmasked region of the surface of the substrate with the blasting medium, parameters used for the blasting action include a blasting time and a blasting number; the sand blasting time is 2-10 minutes; the sand blasting times are N, and N is a positive integer greater than or equal to 1.

6. The method for manufacturing the housing according to claim 1, wherein the blasting medium is at least one selected from the group consisting of alumina sand, silicon carbide sand, and glass beads, and the blasting medium is in the form of spherical particles having a particle size of 100 to 500 μm.

7. The method of manufacturing a shell according to claim 2, wherein the moisture content of the blasting medium is less than 0.05%.

8. The method for manufacturing a housing according to claim 1, wherein in the step of blasting the unmasked region of the surface of the base material with the blasting medium, the blasting medium is ejected by a blasting machine and caused to impinge on the unmasked region of the surface of the base material; the pressure of the air storage tank of the sand blasting machine is 0.10 MPa-0.20 MPa, and in the sand blasting process, the air is filtered and dehumidified.

9. The method of claim 1, wherein the step of partially masking the surface of the substrate to define masked and unmasked areas on the surface of the substrate comprises:

10. The method for manufacturing a housing according to claim 9, wherein the step of blasting the unmasked area of the surface of the substrate with a blasting medium is followed by a step of post-treatment:

removing the masking jig from the substrate;

and cleaning the substrate with the shielding jig removed.

11. The method of claim 1, wherein the step of partially masking the surface of the substrate to define masked and unmasked areas on the surface of the substrate comprises:

12. The method for manufacturing a housing according to claim 11, wherein the step of blasting the unmasked area of the surface of the substrate with the blasting medium is followed by a step of post-treatment:

removing the ink shielding layer covered on the surface of the substrate;

and cleaning the substrate with the ink shielding layer removed.

13. A shell, characterized by being produced by the method for producing a shell according to any one of claims 1 to 12.

14. A housing comprising a ceramic or glass substrate having micron-scale pores on an outer surface thereof.

15. The housing of claim 13 or 14, wherein the housing comprises a middle frame or a rear cover, or the housing is an integrally formed structure of the middle frame and the rear cover.

16. A mobile terminal characterized in that it comprises a housing according to any of claims 13-15.