1. A method of making a housing assembly, the method comprising:

mixing nano glass ceramic powder and plastic to prepare a shell body, wherein the nano glass ceramic powder comprises silicon oxide, sodium oxide, aluminum oxide, zirconium oxide, lithium oxide and magnesium oxide;

and carrying out ion strengthening treatment on the shell body blank to obtain the shell assembly.

2. The method of claim 1, further comprising the step of forming the nano-glass-ceramic powder by: reacting metal salt with a precipitator to generate a precipitate, and calcining the precipitate to obtain nano glass ceramic powder;

the precipitator is ammonia water;

the metal salt comprises 45-80 parts by weight of sodium silicate, 1-35 parts by weight of aluminum chloride, 1-25 parts by weight of lithium chloride, 0.1-10 parts by weight of zirconium oxychloride and 0.1-15 parts by weight of magnesium chloride;

optionally, the metal salt comprises 50 to 75 parts by weight of NaSiO₃.9H₂O, 2-30 weight portions of AlCl₃·6H₂O, 3-20 parts by weight of LiCl5H₂O, 0.5-5 weight portions of ZrOCI₂·8H₂O, 0.3-10 parts by weight of MgCl₂·6H₂O；

The plastic comprises at least one of pyridinium propane sulfonate, polyphenylene sulfone resin, polyamide and ethylene-vinyl acetate copolymer;

the mass ratio of the nano glass ceramic powder to the plastic cement is 0.5-0.8: 0.2-0.5.

3. The method of claim 1, wherein the preparing the case blank comprises the steps of:

modifying the nano glass ceramic powder to obtain composite glass ceramic powder slurry;

drying the composite glass ceramic powder slurry to obtain composite glass ceramic powder;

mixing the composite glass ceramic powder with the plastic, and extruding and granulating to prepare a feed;

injection molding the feed material;

carrying out heat treatment on the material obtained by injection molding to obtain a blank;

and cutting and grinding and polishing the blank to obtain a shell blank.

4. The method of claim 3, wherein preparing the composite glass-ceramic powder slurry comprises: mixing 20-95 parts by weight of nano glass ceramic powder, 0.1-3 parts by weight of modifier, 0.1-1 part by weight of dispersant, 1-20 parts by weight of pigment and solvent, and performing ball milling to obtain composite glass ceramic powder slurry;

optionally, the modifier comprises at least one of a silane coupling agent, ammonium citrate, polyacrylic acid, ammonium polymethacrylate, triethanolammonium;

the dispersing agent comprises at least one of polyvinyl alcohol, polyethylene glycol, stearic acid and ammonium stearate;

the pigment comprises at least one of an organic pigment and an inorganic pigment;

the solvent includes water.

5. The method according to claim 3, wherein in the heat treatment step, the injection-molded material is subjected to a stepwise temperature rise;

optionally, the step of increasing temperature comprises: raising the temperature from room temperature to 150 ℃ within 0.5-1h, preserving the heat for 2-4h at the temperature of 150 ℃, raising the temperature from 150 ℃ to 260 ℃ within 2-4h, preserving the heat for 2-4h at the temperature of 260 ℃, raising the temperature from 260 ℃ to 280-350 ℃ within 0.5-1h, preserving the heat for 4-8h, and then reducing the temperature to room temperature.

6. The method of claim 1, wherein ion strengthening the housing blank comprises:

carrying out primary ion strengthening treatment on the shell body;

and carrying out secondary ion strengthening treatment on the shell body subjected to the primary ion strengthening treatment.

7. The method of claim 6, wherein the primary ion-strengthening treatment comprises: reacting the shell body with a first molten salt;

the first molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of potassium nitrate to sodium nitrate in the first molten salt is 60-80: 20-40 parts of;

the reaction temperature is 300-380 ℃, and the reaction time is 15-120 minutes.

8. The method of claim 6, wherein the secondary ion-strengthening treatment comprises: reacting the shell body subjected to the primary ion strengthening treatment with second molten salt;

the second molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of potassium nitrate to sodium nitrate in the second molten salt is 5-20: 80-95;

the reaction temperature is 300-380 ℃, and the reaction time is 15-600 minutes.

9. The method according to claim 7 or 8, wherein the primary ion strengthening treatment and the secondary ion strengthening treatment are both performed in a stepwise temperature-elevated environment;

the step of raising the temperature comprises the following steps: heating the reaction system to 250-350 ℃ within 0.5-6 h, preserving the heat for 15min, then heating to the reaction temperature for reaction, and then cooling to below 150 ℃.

10. The method of claim 1, wherein after the ion strengthening treatment of the housing blank, the method further comprises: and performing secondary fine polishing treatment on the surface of the shell assembly subjected to the ion strengthening treatment.

11. A housing component produced by the method of claims 1-10.

12. A housing assembly, comprising:

an inorganic component comprising silica, sodium oxide, alumina, zirconia, lithium oxide, and magnesia;

the plastic comprises at least one of pyridinium propanesulfonate, polyphenylene sulfone resin, polyamide and ethylene-vinyl acetate copolymer.

13. An electronic device, characterized in that the electronic device comprises: the display screen assembly, the main board and the shell assembly;

the housing assembly of claim 11 or 12;

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

the mainboard is established in the installation space and with display screen subassembly electricity is connected.

Background

With the gradual popularization of 5G communication technology, the requirements of 3C parts on appearance piece materials are higher and higher, except for meeting the basic signal requirements: low dielectric, low loss, and higher requirements for the appearance of the product: the high-end aesthetic feeling and texture are required, the price is also substantial, and the method provides higher challenges for the existing material technology. The materials of the appearance parts commonly used at present mainly comprise glass, metal, ceramic and plastic. Due to the signal shielding problem, the metal needs to be disconnected by plastic, and the integral aesthetic feeling cannot be realized. The ceramic cannot be used in large batch due to the defects of over high dielectric constant (30-34), high cost, heavy weight and the like. Glass has certain limitation in millimeter wave use due to high dielectric loss, and the sand paper drop resistance of glass is poor. The plastic is difficult to support the expressive force of the product due to the texture of the lower end of the plastic.

The existing ceramic plastic composite material has the defects of low hardness, poor scratch resistance and the like, and the strength of the product is low, particularly when the thickness of the product is less than 0.8mm, the product is fragile, and the strength cannot meet the use requirement.

Disclosure of Invention

The present invention aims to ameliorate at least one of the above technical problems to at least some extent.

To improve the above technical problem, the present invention provides a method for preparing a housing assembly, the method comprising: mixing nano glass ceramic powder and plastic to prepare a shell body, wherein the nano glass ceramic powder comprises silicon oxide, sodium oxide, aluminum oxide, zirconium oxide, lithium oxide and magnesium oxide; and carrying out ion strengthening treatment on the shell body blank to obtain the shell assembly. Therefore, the shell assembly prepared by the method has the advantages of low dielectric constant, low dielectric loss, ceramic texture, high hardness, high strength, strong scratch resistance, capability of meeting the use requirement and the like, and overcomes the defects of low hardness and low strength of the conventional ceramic plastic composite material. In addition, the method has the advantages of cheap and easily obtained raw materials and simple preparation method, and is suitable for industrial large-scale production.

The invention also provides a shell component prepared by the method. Therefore, the shell assembly has the advantages of high strength, high hardness and the like, and the defects of the existing ceramic plastic composite material are overcome.

The present invention also provides a housing assembly comprising: an inorganic component comprising silica, sodium oxide, alumina, zirconia, lithium oxide, and magnesia; the plastic comprises at least one of pyridinium propanesulfonate, polyphenylene sulfone resin, polyamide and ethylene-vinyl acetate copolymer.

The present invention also provides an electronic device, including: the display screen assembly, the main board and the shell assembly; the shell assembly is the shell assembly described above; the display screen assembly is connected with the shell assembly, and an installation space is defined between the display screen assembly and the shell assembly; the mainboard is established in the installation space and with display screen subassembly electricity is connected. Thus, the electronic device has all the features and advantages of the housing assembly described above, and thus, the description thereof is omitted. Generally speaking, the electronic equipment has the characteristics of high strength and high hardness, and can meet the use requirements.

Drawings

FIG. 1 is a flow chart of a method of preparing a housing assembly according to one embodiment of the present invention;

FIG. 2 is a flow chart of a method of preparing a shell blank in accordance with one embodiment of the present invention;

FIG. 3 is a flow chart of a method for performing an ion strengthening treatment on a shell blank in accordance with one embodiment of the present invention;

FIG. 4 is a flow chart of a method of preparing a housing assembly according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of reference numerals:

100-housing assembly, 200-display screen assembly.

Detailed Description

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

The inventor finds that the existing ceramic plastic composite material has the defects of low strength, poor hardness, poor scratch resistance, frangibility and the like, and cannot meet the use requirement. Therefore, it is important to develop a housing assembly that can improve the above-mentioned drawbacks.

In order to improve the above technical problem, the present invention provides a method for preparing a housing assembly, which comprises, with reference to fig. 1:

s100, mixing the nano glass ceramic powder with plastic to prepare a shell body blank

In the step, the nano glass ceramic powder is mixed with the plastic to prepare a shell body. Wherein, the nano glass ceramic powder comprises silicon oxide, sodium oxide, aluminum oxide, zirconium oxide, lithium oxide and magnesium oxide. The invention utilizes the volume expansion caused by the chemical strengthening characteristic of the glass ceramic powder, can improve the density of the finally obtained shell component, and generates compressive stress, thereby improving the strength and hardness of the shell component.

According to the embodiment of the invention, the particle size of the nano glass-ceramic powder is 100-1000 nm. If the particle size is too large, pits are easily formed on the product by the larger particle size in the subsequent polishing treatment step, the appearance effect of the finally prepared shell assembly is influenced, and the texture is poor. If the particle diameter is too small, the production cost is increased. When the particle size of the nano glass ceramic powder is 100-1000nm, the proportion of an inorganic phase in an organic-inorganic mixed phase can be improved due to the small particle size of the glass ceramic powder, and the hardness of the finally prepared shell assembly is further improved.

The source of the nano glass-ceramic powder is not limited in the present invention, and it can be obtained by purchasing each component substance on the market and then simply mixing them, or can be prepared as follows.

Illustratively, the nano glass-ceramic powder can be prepared by the following method: and (3) reacting the metal salt with a precipitator to generate a precipitate, and calcining the precipitate to obtain the nano glass ceramic powder.

Wherein the precipitant is ammonia water. The metal salt comprises 45-80 parts by weight of sodium silicate, 1-35 parts by weight of aluminum chloride, 1-25 parts by weight of lithium chloride, 0.1-10 parts by weight of zirconium oxychloride and 0.1-15 parts by weight of magnesium chloride. The precipitant reacts with the metal salt to produce a metal hydroxide precipitate. The reaction conditions and the amount of the precipitant used are not limited in the present invention. For example, the reaction may be carried out at ambient temperature by adding the metal salt to a solvent (e.g., water) followed by the precipitant, and the precipitant addition is stopped until no further precipitation occurs.

The invention is not limited to specific reaction conditions, and the skilled person can adjust the reaction conditions according to the requirements. Illustratively, the concentration of the solution formed after the metal salt is added to the solvent may be 0.5 to 2 mol/L. After the reaction is finished, the obtained precipitate can be filtered and washed by using a suction filtration device, can be washed for 5-10 times by using deionized water, and then is dried for 1-5 hours at the temperature of 100 ℃.

The present invention does not limit the form in which the metal salt exists, and it may exist in a form not containing water of crystallization, or may exist in a form containing water of crystallization, that is, in the form of a hydrated compound, and when it exists in the form of a hydrated compound, the present invention does not limit the number of water of crystallization.

Illustratively, the metal salt may include 50 to 75 parts by weight of NaSiO₃·9H₂O, 2-30 weight portions of AlCl₃·6H₂O, 3-20 parts by weight of LiCl5H₂O, 0.5-5 weight portions of ZrOCI₂·8H₂O, 0.3-10 parts by weight of MgCl₂·6H₂O。

According to some embodiments of the invention, the plastic comprises at least one of pyridinium propanesulfonate (3- (1-pyridine) -1-propane sulfonate, PPS), Polyphenylene sulfone resins (PPSU), Polyamides (PA), ethylene-vinyl acetate copolymers (EVA).

According to some embodiments of the present invention, the temperature of the calcination may be 500-. Through calcination, the metal hydroxide generates corresponding metal oxide, namely nano glass ceramic powder.

According to the embodiment of the invention, the mass ratio of the nano glass ceramic powder to the plastic is 0.5-0.8: 0.2-0.5. If the mass ratio is too small, the hardness of the final product tends to be small. If the mass ratio is too large, the ratio of the inorganic phase is too large, the fluidity is poor, and the molding effect is poor. When the mass ratio of the nano glass ceramic powder to the plastic is 0.5-0.8: 0.2-0.5, the product has better molding effect and can make the final product have higher hardness.

According to an embodiment of the present invention, referring to fig. 2, a method of preparing a case blank includes:

s110, modifying the nano glass ceramic powder to obtain composite glass ceramic powder slurry

In the step, the nano glass ceramic powder is modified to obtain the composite glass ceramic powder slurry. Through modification treatment, the nano glass ceramic powder can be hydroxylated, and the binding force between the composite glass ceramic powder and a subsequent plastic phase is improved.

According to an embodiment of the present invention, preparing a composite glass-ceramic powder slurry includes: mixing 20-95 parts by weight of nano glass ceramic powder, 0.1-3 parts by weight of modifier, 0.1-1 part by weight of dispersant, 1-20 parts by weight of pigment and solvent, and carrying out ball milling to obtain the composite glass ceramic powder slurry.

According to an embodiment of the present invention, the modifier includes at least one of silane coupling agent, ammonium citrate, polyacrylic acid, ammonium polymethacrylate, and triethanol ammonium, and the nano glass ceramic powder may be hydroxylated by adding the modifier.

The dispersant includes at least one of polyvinyl alcohol (PVA), Polyethylene glycol (PEG), stearic acid, and ammonium stearate, and the dispersant can ensure good dispersion of the nano glass ceramic powder.

The coloring material includes at least one of an organic coloring material and an inorganic coloring material, and a skilled person may add different coloring materials according to the product requirements, and for example, when a black appearance effect is required, at least one of iron oxide, cobalt oxide, manganese oxide, carbon black, and the like may be used as the coloring material.

According to the embodiment of the invention, the reactants are prepared, then the solvent and the grinding balls are added, and the mixture is subjected to ball milling and dispersion in a ball milling tank for 12-48h to prepare the composite glass ceramic powder slurry. Wherein, the mass ratio of the reactant to the solvent to the grinding balls can be 1 (1-3) to (0.5-1), the material of the grinding balls can be at least one of alumina and zirconia, and the solvent can be water.

S120, drying the composite glass ceramic powder slurry to obtain composite glass ceramic powder

In the step, the composite glass ceramic powder slurry is dried to obtain the composite glass ceramic powder. Through the step, the solvent in the slurry can be removed, and the slurry is dried into powder so as to be conveniently and fully mixed with the subsequent plastic.

According to the embodiment of the invention, the feeding temperature can be 70-80 ℃, the air inlet temperature can be 130-160 ℃, the air exhaust temperature can be 70-85 ℃, the temperature in the tower can be 70-90 ℃, and the negative pressure in the tower can be 50-150 Pa.

S130, mixing the composite glass ceramic powder with plastic, extruding and granulating to obtain a feed

In the step, the composite glass ceramic powder and the plastic are mixed, extruded and granulated to prepare the feed. After the composite glass ceramic powder and the plastic are mixed, the mixture can be dispersed by an internal mixer or a blending extruder, and technicians can adjust the times of blending or internal mixing according to requirements, for example, the times of blending or internal mixing include but are not limited to 2-5 times, and after the materials are uniformly mixed, the materials are extruded and granulated to prepare the feed for injection molding.

S140, injection molding the feed

In this step, the feedstock is injection molded. The conditions of injection molding are not limited by the present invention and can be adjusted by the skilled person as required.

According to the embodiment of the invention, the feedstock prepared in the step S130 can be dried at 90-150 ℃ for 8-12h, and then is added into an injection machine for injection molding, wherein the molding temperature is controlled at 360 ℃ and the injection speed is controlled at 70-100%, the injection pressure is controlled at 250MPa and 120 MPa, the mold temperature is controlled at 180 ℃ and the pressure maintaining time is controlled at 2-60S.

S150, carrying out heat treatment on the material obtained by injection molding to obtain a blank

In this step, the material obtained by injection molding is subjected to heat treatment to obtain a blank. Through the heat treatment, the plastic cement can be crosslinked and branch-chain expanded, and can be subjected to crosslinking reaction with the modified functional group on the surface of the composite glass ceramic powder.

According to the embodiment of the invention, the injection molding material can be supported by the clamp jig, placed in the oven and heated. According to an embodiment of the invention, the warming process is a step warming. The staged heating mode can reduce the reaction rate and make the plastic more fully crosslinked.

Illustratively, the phase warming includes: raising the temperature from room temperature to 150 ℃ within 0.5-1h, preserving the heat for 2-4h at the temperature of 150 ℃, raising the temperature from 150 ℃ to 260 ℃ within 2-4h, preserving the heat for 2-4h at the temperature of 260 ℃, raising the temperature from 260 ℃ to 280-350 ℃ within 0.5-1h, preserving the heat for 4-8h, and then reducing the temperature to room temperature. Therefore, the plastic can be more fully crosslinked.

S160, cutting and grinding and polishing the blank

In this step, the blank is subjected to cutting processing and grinding and polishing processing. Wherein the cutting process comprises: and carrying out CNC machining on the blank according to a product drawing. The specific parameters of CNC processing can be adjusted according to the product requirements. Illustratively, the CNC processing can select a diamond PCD milling cutter, the rotating speed of a main shaft is controlled at 10000-25000rpm, and the single cutting amount can be controlled at 0.01-0.50 mm.

The skilled person can select the specific process conditions of the grinding process according to the product structure and requirements. For example, the grinding and polishing process may be performed by a five-axis grinding and polishing machine, a 13.6B double-side grinder, or a polishing machine. The grinding and polishing process includes, but is not limited to, two processes of rough polishing and fine polishing. The rough polishing adopts one or more of a sweeping machine, a double-sided grinder and a five-axis polisher, the polishing disc is selected from one or more of pig hair, a buffing disc, damping cloth, rubber wires, copper wires, a carpet or a composite material of the pig hair and the buffing, the polishing auxiliary agent generally adopts water system diamond grinding liquid and oil system diamond grinding liquid, the granularity of the polishing auxiliary agent can be 0.5-20 mu m, and the mass concentration can be 1-30%. The fine polishing can adopt one or two of a sweeping machine and a double-sided grinder, the polishing solution can be one of silicon oxide and cerium oxide, the granularity can be 50-500nm, and the mass concentration can be 5-45%.

S200, carrying out ion strengthening treatment on the shell blank to obtain the shell assembly.

In this step, the shell blank is subjected to ion strengthening treatment to obtain a shell assembly. By the ion strengthening treatment, the strength and hardness of the housing assembly can be improved.

According to an embodiment of the present invention, referring to fig. 3, the performing of the ion strengthening treatment on the case blank includes:

s210, carrying out primary ion strengthening treatment on the shell body blank

In this step, the shell blank is subjected to primary ion strengthening treatment. Through one-time ion strengthening treatment, the surface of the shell body blank can generate compressive stress, and the expansion of cracks is effectively blocked, so that the strength and the hardness of the product are improved.

According to an embodiment of the present invention, the primary ion strengthening treatment includes: and reacting the shell body with the first molten salt. The first molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of potassium nitrate to sodium nitrate in the first molten salt is 60-80: 20-40, such as 62:38, 65:35, 70:30, 75:25, 80: 20. The reaction temperature is 300-380 deg.C, such as 300 deg.C, 310 deg.C, 320 deg.C, 330 deg.C, 340 deg.C, 350 deg.C, 360 deg.C, 370 deg.C, 380 deg.C. If the reaction temperature is higher than 380 ℃, adverse side reactions such as organic phase decomposition and the like can occur, and the strength and hardness of the final shell assembly are influenced; if the reaction temperature is less than 300 ℃, there is a case where the reaction is not completed. The reaction time is 15 to 120 minutes, for example, 15 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, 120 minutes.

According to some embodiments of the invention, the primary ion-strengthening treatment comprises: and (3) after the shell body is assembled by using a jig, placing the shell body in the first molten salt, heating the first molten salt for reaction, and taking out the shell body after the temperature is reduced to below 150 ℃ after the reaction is finished.

S220, performing secondary ion strengthening treatment on the shell blank subjected to primary ion strengthening treatment

In this step, the shell blank subjected to the primary ion strengthening treatment is subjected to secondary ion strengthening treatment. Through secondary ion strengthening treatment, compressive stress can be further generated on the surface of the shell body blank, and the expansion of cracks can be further effectively blocked, so that the strength and the hardness of the product are further improved.

The strength and hardness of the product can be improved after two times of ion strengthening, and the strength and hardness can meet the use requirements. Specifically, the composite glass ceramic powder has 0.5-5% volume expansion after strengthening, and the composite glass ceramic powder can reduce the gap between an organic phase and an inorganic phase after the volume expansion, so that the microstructure of the shell component is more compact, and the surface hardness and the strength of the shell component are improved.

According to an embodiment of the present invention, the secondary ion strengthening treatment includes: and reacting the shell body subjected to the primary ion strengthening treatment with second molten salt. The second molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of potassium nitrate to sodium nitrate in the second molten salt is 5-20: 80-95, such as 5:95, 10:90, 15:85, 20: 80. The reaction temperature is 300-; if the reaction temperature is too low, the ion strengthening may be insufficient. The reaction time is 15 to 600 minutes, for example 15 minutes, 20 minutes, 50 minutes, 60 minutes, 80 minutes, 100 minutes, 150 minutes, 200 minutes, 250 minutes, 300 minutes, 350 minutes, 400 minutes, 450 minutes, 500 minutes, 550 minutes, 600 minutes.

According to an embodiment of the present invention, the secondary ion strengthening treatment includes: and (3) installing the shell body subjected to primary ion strengthening treatment by using a jig, placing the shell body in second molten salt, and heating for reaction.

According to the embodiment of the invention, the primary ion strengthening treatment and the secondary ion strengthening treatment are both carried out in a stage temperature rising environment, and the stage temperature rising mode can effectively control the reaction rate, so that the primary ion strengthening treatment or the secondary ion strengthening treatment is carried out more fully and thoroughly.

According to an embodiment of the present invention, the step temperature increase in the primary ion strengthening treatment and the secondary ion strengthening treatment includes: heating the reaction system to 250-350 ℃ within 0.5-6 h, preserving the heat for 15min, then heating to the reaction temperature for reaction, and then cooling to below 150 ℃. This makes it possible to perform the primary ion strengthening treatment or the secondary ion strengthening treatment more thoroughly.

After the ion strengthening treatment is performed on the case blank according to the embodiment of the present invention, referring to fig. 4, the method further includes:

s300, performing secondary fine polishing treatment on the surface of the shell assembly subjected to ion strengthening treatment

In the step, secondary fine polishing treatment is performed on the surface of the shell assembly subjected to the ion strengthening treatment. The inventor finds that the surface of a product subjected to ion strengthening treatment has some defects such as scratches and slight carbonization of organic matters, and can remove some micro defects on the appearance surface of the shell assembly through secondary fine polishing treatment, and technicians can adjust specific parameters of the secondary fine polishing treatment according to requirements. For example, buffing with buffing and silica polishing slurry may be used, with a working throughput of 5-20 μm.

According to some embodiments of the invention, the shell assembly prepared by the method has the dielectric constant of 3-6, low dielectric loss, bright ceramic texture, good appearance effect, high strength and high hardness.

The invention also provides a shell component prepared by the method. Thus, the housing assembly has all the features and advantages of the method described above, which are not described in detail herein.

The present invention also provides a housing assembly comprising: the plastic cement comprises at least one of pyridinium propanesulfonate, polyphenylene sulfone resin, polyamide and ethylene-vinyl acetate copolymer. According to some embodiments of the present invention, the housing assembly has all the features and advantages of the housing assembly prepared by the method described above, and thus the description thereof is omitted. Generally speaking, the shell assembly has the appearance effect of ceramic, the appearance expressive force is good, and the shell assembly has the advantages of high hardness, high strength, strong scratch resistance and the like.

The present invention also provides an electronic device, including: the display screen assembly comprises a shell assembly 100, a display screen assembly 200 and a mainboard, wherein the shell assembly 100 is the shell assembly, the display screen assembly is connected with the shell assembly 100, an installation space is defined between the display screen assembly 200 and the shell assembly 100, and the mainboard is arranged in the installation space and is electrically connected with the display screen assembly 200.

The specific type of electronic device is not particularly limited by the present application and, for example, the electronic device may be a cell phone, a smart watch, a palm top computer, a notebook computer, a laptop computer, a desktop computer, a portable gaming device, a video recorder, a camera, a pager, or a printer, among others. In particular, the electronic device may be a mobile phone or smart phone (e.g., iPhone (TM) based, Android (TM) based phone), a Portable gaming device (e.g., Nintendo DS (TM), PlayStation Portable (TM), Gameboy Advance (TM), iPhone (TM)), a PDA, a Portable internet device, a music player, and a data storage device, other handheld devices, and a headset such as a watch, an in-ear headphone, a pendant, a headset, etc., and other wearable devices (e.g., a Head Mounted Device (HMD) such as electronic glasses, electronic clothing, an electronic bracelet, an electronic necklace, an electronic tattoo, or a smart watch). Thus, the electronic device has all the features and advantages of the housing assembly described above, and will not be described herein.

The examples described below in this application, unless otherwise indicated, all reagents used are either commercially available or can be prepared by the methods described in this application.

Example 1

(1) Preparing nano glass ceramic powder by adopting a liquid phase precipitation method: weighing metal salt, wherein the metal salt comprises 70 parts by weight of NaSiO3 & 9H2O, 20 parts by weight of AlCl3 & 6H2O, 9 parts by weight of LiCl & 5H2O, 0.5 part by weight of ZrOCI2 & 8H2O and 0.5 part by weight of MgCl2 & 6H2O based on the total mass of the metal salt. Respectively adding pure water into each weighed component of the metal salt for dissolving, preparing a solution with the concentration of 1mol/L, then mixing the metal salt solutions of the components to form a metal salt solution, and then adding ammonia water into the metal salt solution to generate a precipitate. Then filtering and cleaning the mixture by using filter paper and a suction filtration device (cleaning the mixture for 5 to 10 times by using deionized water), drying the mixture for 2 hours at 100 ℃, and calcining the dried powder for 12 hours at 800 ℃ to prepare the nano glass ceramic powder, wherein the particle size of the nano composite glass ceramic powder is 200-500 nm.

(2) Modification of the nano glass ceramic powder: modifying the nano glass ceramic powder prepared in the step (1) according to the following formula.

Based on the total mass of the nano glass ceramic powder, the modifier, the dispersant and the pigment, 93 parts by weight of the nano glass ceramic powder, 0.5 part by weight of the modifier, 0.5 part by weight of the dispersant and 6 parts by weight of the pigment are weighed. Wherein, the modifier is a silane coupling agent, the dispersant is PEG and stearic acid, and the pigment is carbon black.

The raw materials are weighed, added with water and grinding balls (the grinding balls are made of alumina or zirconia, the mass ratio of the raw materials to the water to the grinding balls is controlled to be 1:1-3:0.5-1), and placed in a ball milling tank for ball milling and dispersion for 24 hours to prepare the composite glass ceramic powder slurry.

(3) Preparing composite glass ceramic powder: and (3) carrying out spray drying granulation on the slurry prepared in the step (2) to prepare the composite glass ceramic powder. Wherein the feeding temperature is 80 ℃, the air inlet temperature is 150 ℃, the air exhaust temperature is 75 ℃, the temperature in the tower is 80 ℃, and the negative pressure in the tower is 100 Pa.

(4) Preparation of feed: and (3) mixing the composite glass ceramic powder prepared in the step (3) with plastic, wherein the plastic is a compound of PPS and PA, mixing the composite glass ceramic powder and the plastic according to the mass ratio of 1:0.3, dispersing the mixture by using a blending extruder after the mixture is mixed for 4 times, and extruding and granulating the mixture after the materials are uniformly mixed to prepare the feed for injection molding.

(5) Injection molding: and (3) drying the feed prepared in the step (4) at 100 ℃ for 9h, then adding the feed into an injection machine for injection molding, wherein the molding temperature is controlled at 335 ℃, the injection speed is controlled at 70%, the injection pressure is controlled at 180MPa, the mold temperature is controlled at 140 ℃, and the pressure maintaining time is controlled at 10 s.

(6) And (3) heat treatment: and (3) supporting the material obtained in the step (5) by using a clamping jig, and placing the material in an oven, and heating and polymerizing according to the following curve: 1) heating to 150 ℃ at room temperature for 1 h; 2) keeping the temperature at 150 ℃ for 2 h; 3) heating the temperature from 150 ℃ to 260 ℃ within 3 h; 4) keeping the temperature at 260 ℃ for 2 h; 5) raising the temperature from 260 ℃ to 330 ℃ within 0.5h and keeping the temperature for 8 h; naturally cooling to room temperature. And (5) preparing a blank.

(7) CNC machining: and (4) carrying out CNC machining on the blank prepared in the step (6) according to a product drawing, wherein a diamond PCD milling cutter is selected for CNC machining, the rotating speed of a main shaft is controlled at 22000rpm, and the single cutting amount is controlled at 0.05 mm.

(8) Grinding and polishing: polishing the CNC processed product in the step (7): the rough polishing adopts a sweeping machine, the polishing disc is selected from pig hair, the polishing auxiliary agent is water-based diamond grinding liquid, the granularity of the polishing auxiliary agent is 3.5 mu m, and the mass concentration of the polishing auxiliary agent is 10%. The fine polishing adopts a light sweeping machine, the polishing solution adopts silicon oxide, the granularity of the polishing solution is 100-200nm, and the mass concentration of the polishing auxiliary agent is 35%.

(9) Primary ion strengthening: putting the product prepared in the step (8) into first molten salt after the product is assembled by using a jig, wherein the first molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of the potassium nitrate to the sodium nitrate is 62: 38. heating the first molten salt to 300 ℃ within 0.5h, and keeping the temperature for 15 min; then heating to 360 ℃ for ion exchange reinforcement, wherein the reinforcement time is 50 min; and (4) cooling the furnace body to below 150 ℃, and taking out the product.

(10) Secondary ion strengthening: and (3) putting the product prepared in the step (9) into second molten salt after the product is assembled by using a jig, wherein the second molten salt comprises potassium nitrate and sodium nitrate, and the mass ratio of the potassium nitrate to the sodium nitrate is 10: 90. heating the second molten salt to 300 ℃ within 0.5h, and keeping the temperature for 15 min; then heating to 360 ℃ for ion exchange reinforcement, wherein the reinforcement time is 50 min; and (4) cooling the furnace body to below 150 ℃, and taking out the product.

(11) Secondary fine polishing: and (4) adopting buffing and silicon oxide polishing solution to perform polishing, wherein the polishing time is 15 min.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

The strength and hardness of the housing assemblies prepared in example 1 and control 1 were tested using the housing assembly prepared according to the specifications of example 4 having application number 201810297980.4 as control 1, and the test results are shown in table 1 below.

TABLE 1

As can be seen from table 1, the hardness and strength of the case assembly prepared in example 1 are significantly higher than those of control 1, and the hardness and strength of the case assembly of example 1 can meet the use requirements. The method can obviously improve the strength and the hardness of the shell assembly. And when the thickness of the shell assembly is smaller, the hardness and the strength of the shell assembly can still meet the use requirements.

Example 2

A housing assembly was prepared by the method of reference example 1, except that:

in the step (1), the metal salt comprises 50 parts by weight of NaSiO 3.9H 2O, 30 parts by weight of AlCl 3.6H2O, 5 parts by weight of LiCl.5H2O, 5 parts by weight of ZrOCI 2.8H2O and 10 parts by weight of MgCl 2.6H2O.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 3

A housing assembly was prepared by the method of reference example 1, except that:

in the step (1), the metal salt comprises 60 parts by weight of NaSiO 3.9H 2O, 10 parts by weight of AlCl 3.6H2O, 20 parts by weight of LiCl.5H2O, 4 parts by weight of ZrOCI 2.8H2O and 6 parts by weight of MgCl 2.6H2O.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 4

A housing assembly was prepared by the method of reference example 1, except that:

in the step (4), the mass ratio of the composite glass ceramic powder to the plastic is 1: 1.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 5

A housing assembly was prepared by the method of reference example 1, except that:

in the step (4), the mass ratio of the composite glass ceramic powder to the plastic is 1: 0.25.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 6

A housing assembly was prepared by the method of reference example 1, except that:

in the step (9), the mass ratio of potassium nitrate to sodium nitrate in the first molten salt is 70:30, the temperature of primary ion strengthening is 320 ℃, and the strengthening time is 90 min.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 7

A housing assembly was prepared by the method of reference example 1, except that:

in the step (9), the mass ratio of potassium nitrate to sodium nitrate in the first molten salt is 80:20, the temperature of primary ion strengthening is 380 ℃, and the strengthening time is 15 min.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 8

A housing assembly was prepared by the method of reference example 1, except that:

in the step (10), the mass ratio of potassium nitrate to sodium nitrate in the second molten salt is 5:95, the temperature of secondary ion strengthening is 380 ℃, and the strengthening time is 15 min.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

Example 9

A housing assembly was prepared by the method of reference example 1, except that:

in the step (10), the mass ratio of potassium nitrate to sodium nitrate in the second molten salt is 20:80, the temperature of secondary ion strengthening is 300 ℃, and the strengthening time is 600 min.

The resulting housing assembly has a dielectric constant of 3-6 and has a ceramic-like and aesthetic appearance.

The strength and hardness of the housing assemblies prepared in examples 2-9 and the control were tested using a control prepared according to the specification of application No. 201810297980.4, and the results are shown in table 2 below.

TABLE 2

As can be seen from table 2, the hardness and strength of the housing assemblies prepared in examples 2 to 9 were significantly higher than those of the control group, and the hardness and strength of the housing assemblies of examples 2 to 7 could meet the use requirements. Thus, the method of the present invention can significantly improve the strength and hardness of the housing assembly. And when the thickness of the shell assembly is smaller, the hardness and the strength of the shell assembly can still meet the use requirements.

The embodiments of the present application have been described in detail, but the present application is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and the simple modifications belong to the protection scope of the present application. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention.

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

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