Shell and preparation method thereof, and terminal equipment

Abstract

The present application provides a shell and a method for preparing the same, and a terminal device. The shell includes a substrate layer and an ink layer disposed on one side of the substrate layer; a plurality of light-absorbing particles are dispersed in the ink layer, and the light-absorbing particles can be broken by irradiation with a laser having a wavelength of 532 nm. The shell can form a laser character pattern with a clear and scratch-free feel, and the patterned shell can meet the safety and reliability requirements of the battery of the terminal.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to a housing and a preparation method thereof, and a terminal device. Background Art

[0002] In order to comply with the regulatory requirements of overseas regions, different character patterns need to be engraved on the surface of the back cover of terminal devices (e.g., mobile phones). Generally, manufacturers will operate on the entire back cover of the terminal device, such as using laser engraving equipment to etch the back cover to form a character pattern. In the related art, a purple laser with a wavelength of ≤355nm is often used to form a character pattern on the back cover, which will cause the surface of the corresponding area to be rough and scratchy, affecting the consumer's experience of use; in addition, the above process is also prone to ablating the back cover during the laser process, causing explosion points on the shell appearance, affecting the appearance of the terminal device. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a housing and a method for preparing the same, and a terminal device. The housing can form a laser character pattern with a clear and scratch-free feel, and the patterned housing can meet the safety and reliability requirements of the battery of the terminal.

[0004] A first aspect of an embodiment of the present application provides a shell, comprising a substrate layer and an ink layer arranged on one surface of the substrate layer; a plurality of light-absorbing particles are dispersed in the ink layer, and the light-absorbing particles can be broken by irradiation with a laser with a wavelength of 532 nm.

[0005] Based on the inherent properties of the ink layer, laser irradiation with a wavelength of 532nm can change the material in the ink layer, thereby forming a permanent pattern. More importantly, in the ink layer provided by the embodiment of the present application, the light-absorbing particles can be melted and reorganized after the above-mentioned laser irradiation, and a single light-absorbing particle can be broken into multiple particles with smaller particle sizes, and absorb a large amount of photon energy in the above process, thereby suppressing the bulging and splitting of the ink layer. Therefore, the shell provided with the above-mentioned ink layer can form a clear and scratch-free laser character pattern, and the above-mentioned patterned shell can meet the safety and reliability requirements of the terminal battery.

[0006] In some embodiments of the present application, the material of the light-absorbing particles includes one or more of nickel titanate, cobalt titanate, tin disulfide, cerium trisulfide and perovskite. The above materials can quickly absorb a large amount of photon energy after being irradiated by a laser with a wavelength of 532nm, thereby effectively inhibiting the bulging and splitting of the ink layer, and they will not have side reactions with other components in the ink layer under the high-energy laser irradiation.

[0007] In some embodiments of the present application, the ink layer includes at least one first ink sublayer and at least one second ink sublayer stacked in layers; the plurality of light-absorbing particles are dispersed in the first ink sublayer. This is conducive to the rapid absorption of photon energy and the effective suppression of bulging and splitting of the entire ink layer; at the same time, it is also conducive to the performance of the intrinsic effects of the ink layer such as light-shielding properties.

[0008] In some embodiments of the present application, the thickness of the first ink sublayer is 3 μm-5 μm. In this way, the light absorbing particles can be effectively utilized and a clear character pattern can be formed, while the production cost of the housing can be effectively controlled.

[0009] In some implementations of the present application, the total mass of the light absorbing particles accounts for 5%-30% of the total mass of the first ink sublayer.

[0010] In some embodiments of the present application, the ink layer has a thickness of 10 μm-25 μm, so as to ensure the thinness of the housing and enhance market competitiveness.

[0011] In some embodiments of the present application, a silk-screen layer and a texture layer are stacked between the substrate layer and the ink layer, or a silk-screen layer, a texture layer and an electroplating layer are stacked between the substrate layer and the ink layer; the silk-screen layer is arranged close to the substrate layer. In this way, the housing has higher hardness, better wear resistance, and richer appearance.

[0012] In some embodiments of the present application, the substrate layer includes a stacked polymethyl methacrylate layer and a polycarbonate layer, and the polymethyl methacrylate layer is disposed on a surface of the polycarbonate layer away from the ink layer. In this way, the mechanical properties of the shell are better and the transmittance to the laser with a wavelength of 532nm is good.

[0013] In some embodiments of the present application, the ink layer is a non-patterned ink layer.

[0014] In some embodiments of the present application, the particle size of the plurality of light absorbing particles is 50 nm to 200 nm, which is conducive to uniform dispersion of the light absorbing particles in the ink layer.

[0015] In some embodiments of the present application, the ink layer is a patterned ink layer.

[0016] In some embodiments of the present application, at least some of the light absorbing particles have a particle size of 10 nm-30 nm.

[0017] A second aspect of an embodiment of the present application provides a method for preparing a housing, comprising:

[0018] An ink slurry containing a plurality of light-absorbing particles is disposed on one surface of a substrate to form a non-patterned ink layer, thereby obtaining a shell; wherein the light-absorbing particles can be broken by irradiation with a laser having a wavelength of 532 nm.

[0019] The preparation method is simple and easy to implement, has reliable process and high production efficiency, and is suitable for large-scale industrial production.

[0020] In some embodiments of the present application, the particle size of the light absorbing particles is 50nm-200nm.

[0021] In some embodiments of the present application, the preparation method further comprises: irradiating a local area of ​​the non-patterned ink layer with a laser having a wavelength of 532 nm, so as to transform the non-patterned ink layer into a patterned ink layer.

[0022] In some embodiments of the present application, in the patterned ink layer, at least some of the light absorbing particles have a particle size of 10 nm-30 nm.

[0023] In some embodiments of the present application, the energy of the laser with a wavelength of 532nm is 0.6W-3W. In this way, a clear character pattern can be engraved in the shell, and the ink layer bulging and cracking caused by excessive energy can be avoided, thereby ensuring the safety of the battery of the terminal device.

[0024] The third aspect of the embodiment of the present application provides a terminal device, including the housing provided by the first aspect of the embodiment of the present application. Due to the use of the housing provided by the embodiment of the present application, the terminal device can have higher market competitiveness.

[0025] In some implementations of the present application, the above-mentioned terminal devices include consumer electronic products such as mobile phones, tablet computers, laptop computers, smart watches, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A This is a photo of the front side of the shell after the character pattern is formed by the laser ink layer with a wavelength of 532nm in the related art;

[0027] Figure 1B for Figure 1A A photo of the back of the housing;

[0028] Figure 2 A schematic structural diagram of a housing provided in one embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of a shell including a first ink sub-layer and a second ink sub-layer provided in one embodiment of the present application;

[0030] Figure 4 A schematic structural diagram of a housing provided in another embodiment of the present application;

[0031] Figure 5 A schematic structural diagram of a housing provided in yet another embodiment of the present application;

[0032] Figure 6 A schematic structural diagram of a housing provided in yet another embodiment of the present application;

[0033] Figure 7 A schematic structural diagram of a housing provided in yet another embodiment of the present application;

[0034] Figure 8 An optical microscope photograph of a cross section of a shell provided in yet another embodiment of the present application;

[0035] Fig.9A A transmission electron microscope (TEM) photograph of a plurality of light-absorbing particle dispersions provided in yet another embodiment of the present application;

[0036] Fig. 9B for Fig.9A TEM image of the light-absorbing particle dispersion after being irradiated with a laser of 532 nm.

[0037] Explanation of the accompanying drawings: 1-shell; 10-substrate layer; 101-polymethyl methacrylate layer; 102-polycarbonate layer; 20-ink layer; 201-first ink sublayer; 202-second ink sublayer; 21-light-absorbing particles; 30-silk-screen layer; 40-texture layer; 50-electroplating layer; 60-hardening layer. DETAILED DESCRIPTION

[0038] When terminal equipment is sold in some overseas regions, the designated area on the shell surface generally needs to be engraved with specified character patterns, such as the back cover of a mobile phone. In the actual production process, a purple laser with a wavelength of ≤355nm is usually used to irradiate the designated area of ​​the shell, so that the surface material of the shell vaporizes to produce pits, thereby forming character patterns. Local pits increase the surface roughness of the corresponding area on the shell surface, resulting in a scratchy feel, which affects the consumer's experience; and, due to the current structure of the shell (for example, a mobile phone), the ultraviolet light absorption rate and thickness of the surface material cannot be unified, resulting in the photons in the laser often penetrating into the base layer of the shell (for example, a polycarbonate layer), ablating the base layer and causing black spots to appear on the shell appearance.

[0039] If the laser is replaced, for example, with a green laser with a wavelength of 532nm, it is indeed not easily absorbed by the material of the base layer of the shell (for example, polycarbonate), and can directly penetrate into the ink layer and cause the material of the ink layer to undergo physical changes to achieve patterning. Figure 1A and Figure 1BAs shown, the ink layer of the shell in the related art is prone to exhaust bulging after absorbing photon energy, and the ink layer is split; wherein, Figure 1A A photo of the front side (appearance side for terminal equipment) of a conventional housing after being laser-printed with a wavelength of 532nm to form a character pattern. Figure 1B for Figure 1A The photo of the back of the shell in . Since the above laser process is generally carried out on the whole terminal device, and the laser position of the character pattern is generally located near the battery of the terminal device, the degassing and bulging of the ink layer will threaten the safety of the battery and affect the yield rate of the whole device. Reducing the laser energy can reduce the risk of degassing and bulging of the ink layer, but the low-energy laser mentioned above is difficult to penetrate the surface material of the shell to reach the ink layer, and it is impossible to obtain a clear character pattern, or even to engrave the pattern. In addition, increasing the thickness of the ink layer is also conducive to reducing the risk of ink layer splitting, but it will cause the thickness of the shell to increase significantly, affecting the thinness of the terminal device.

[0040] To solve the above technical problems, please refer to Figure 2 The embodiment of the present application provides a housing 1, comprising a substrate layer 10 and an ink layer 20 disposed on one side of the substrate layer 10; a plurality of light-absorbing particles 21 are dispersed in the ink layer 20, and the light-absorbing particles 21 can be broken by irradiation with a laser having a wavelength of 532 nm. It should be noted that Figure 2 Just an illustrative drawing. Figure 2 The size of the substrate layer 10 and the ink layer 20, and the particle size, quantity and distribution of the light absorbing particles 21 do not limit the housing 1 of the embodiment of the present application.

[0041] It can be understood that the matrix of the ink layer 20 in the shell of the terminal device is generally a resin (for example, acrylic resin, etc.), and other components such as pigment particles (for example, carbon black, etc.), functional fillers (for example, barium sulfate, talcum powder, etc.) are generally dispersed in the resin matrix, wherein the resin dispersed with pigment particles has a strong absorption energy for light. When the above-mentioned ink layer 20 is irradiated with a green laser with a wavelength of 532nm, the material of the ink layer 20 (mainly a mixture of pigment and resin) can absorb the photon energy of the above-mentioned laser and undergo physical changes, so that the character pattern can be engraved in the ink layer 20 by laser processing and other processes. More importantly, the light-absorbing particles 21 in the ink layer 20 are melted and reorganized after the above-mentioned laser irradiation, and a single light-absorbing particle 21 can be cracked into multiple particles with smaller particle sizes, and absorb a large amount of photon energy in the above-mentioned process, thereby suppressing the bulging and splitting of the ink layer 20. Therefore, the shell 1 provided with the above-mentioned ink layer 20 can form a clear and scratch-free laser character pattern, and the above-mentioned patterned shell 1 can meet the safety and reliability requirements of the battery of the terminal.

[0042] In the embodiment of the present application, a scanning electron microscope (SEM) can be used to characterize the rupture of the light absorbing particles 21. In the embodiment of the present application, the material selection and component ratio of the components other than the light absorbing particles in the ink layer 20 are not limited, and can be any component formula known in the art that is suitable for the ink layer 20 of the housing 1.

[0043] In some embodiments of the present application, the bandgap width of the light-absorbing particles 21 is less than 2.3 eV. The light-absorbing particles with the above-mentioned bandgap width can effectively absorb the photon energy of the laser with a wavelength of 532 nm, and can better suppress the bulging and splitting of the ink layer. The bandgap width is an intrinsic property of the material. In the embodiments of the present application, the material of the light-absorbing particles 21 can be determined, and then the standard bandgap width of the corresponding material can be queried; or, the bandgap width of the corresponding material can be tested using an ultraviolet spectrophotometer.

[0044] In some embodiments of the present application, the material of the light-absorbing particles 21 includes but is not limited to one or more of nickel titanate, cobalt titanate, tin disulfide, cerium trisulfide and perovskite. After being irradiated by the laser of the above wavelength, the above materials can quickly absorb a large amount of photon energy, thereby effectively inhibiting the bulging and splitting of the ink layer 20, and they will not have side reactions with other components in the ink layer 20 under the high-energy laser irradiation. At the same time, the light-absorbing particles 21 of the above materials will not affect the inherent properties of the ink layer 20 (for example, light-shielding properties, etc.), are commercially easy to obtain, and the cost is controllable, which is conducive to ensuring that the comprehensive performance of the shell 1 is good. In some specific embodiments, in order to simplify the preparation process and avoid the risk of chemical side reactions between light-absorbing particles 21 of different materials under high laser energy, the light-absorbing particles 21 are selected from one of nickel titanate particles, cobalt titanate particles, tin disulfide particles, cerium trisulfide particles and perovskite particles.

[0045] In the embodiment of the present application, an energy dispersive spectrometer (EDS) or an Auger electron spectroscopy (AES) or an X-ray photoelectron spectroscopy (XPS) may be used to characterize the presence of the light absorbing particles 21 .

[0046] In the embodiment of the present application, the plurality of light absorbing particles 21 may be dispersed in the entire ink layer 20, or may be dispersed in a partial area of ​​the ink layer 20. In some embodiments of the present application, see Figure 3, the ink layer 20 includes at least one first ink sublayer 201 and at least one second ink sublayer 202 which are stacked; a plurality of light absorbing particles 21 are dispersed in the first ink sublayer 201. The light absorbing particles 21 are dispersed in the entire ink layer 20, or the light absorbing particles 21 are concentrated in the first ink sublayer 201. It is necessary to make the local concentration of the light absorbing particles 21 in the area where the light absorbing particles 21 are dispersed reach a certain requirement to be more conducive to the absorption of photon energy, thereby being more conducive to avoiding the bulging and splitting of the entire ink layer 20. Therefore, the light absorbing particles 21 are concentrated in the first ink sublayer 201, which is conducive to the rapid absorption of photon energy, effectively inhibiting the bulging and splitting of the entire ink layer 20, and can also significantly reduce the material cost of the housing 1; at the same time, it is also conducive to the performance of the intrinsic effects such as the light shielding of the ink layer 20. It can be understood that the ink layer 20 is also used to provide the housing 1 with an appearance color. The color of the ink layer 20 is not limited in the embodiment of the present application, and can be selected from any color known in the art that is suitable for the ink layer 20.

[0047] In the embodiment of the present application, AES or EDS can be used to distinguish the first ink sublayer 201 and the second ink sublayer 202; specifically, along the thickness direction of the shell 1, with one side surface of the ink layer 20 as the reference (H=0), from H a To H b The light absorbing particles 21 are dispersed in the depth of |H, then the area is the first ink sub-layer 201, and the thickness of the first ink sub-layer 201 is |H a -H b |. In the embodiment of the present application, the ink layer 20 may include a first ink sublayer 201 and a plurality of second ink sublayers 202; for example, along the thickness direction of the housing 1, the ink layer 20 includes a second ink sublayer 202, a first ink sublayer 201, and a second ink sublayer 202 that are stacked. Alternatively, the ink layer 20 is composed of a first ink sublayer 201 and a second ink sublayer 202 that are stacked. Alternatively, the ink layer 20 includes a plurality of first ink sublayers 201 and a plurality of second ink sublayers 202 that are stacked at intervals; for example, along the thickness direction of the housing 1, the ink layer 20 includes a second ink sublayer 202, a first ink sublayer 201, a second ink sublayer 202, and a first ink sublayer 201 that are stacked. In some specific embodiments, the ink layer 20 includes a first ink sublayer 201 and a second ink sublayer 202 that are stacked, so that the preparation process of the ink layer 20 can be saved. The first ink sublayer 201 is disposed on a side close to the substrate layer 10 , or may be disposed on a side away from the substrate layer 10 .

[0048] In some specific embodiments, the first ink sublayer 201 is only disposed in a partial area of ​​the housing 1 in a direction perpendicular to the thickness of the housing 1. Specifically, the first ink sublayer 201 is disposed in the area to be lasered, so that the material cost of the housing 1 can be further reduced.

[0049] It should also be noted that the colors of the first ink sublayer 201 and the second ink sublayer 202 can be the same or different. When the shell 1 includes multiple first ink sublayers 201, the colors of the multiple first ink sublayers 201 can be the same or different. When the shell 1 includes multiple second ink sublayers 202, the colors of the multiple second ink sublayers 202 can be the same or different. Furthermore, a single first ink sublayer 201 and a single second ink sublayer 202 can include multiple colors at the same time, and the present application does not limit this. For example, a single second ink sublayer 202 includes multiple color layers stacked together, and the colors of the multiple color layers are different; or, the color of the single second ink sublayer 202 gradually changes along the thickness direction perpendicular to the shell.

[0050] In some embodiments of the present application, the total mass proportion of the light-absorbing particles 21 in the first ink sublayer 201 is 5%-30%. In this way, there are sufficient light-absorbing particles 21 in the first ink sublayer 201 to absorb photon energy, inhibit the bulging and splitting of the entire ink layer 20, and the material cost is low; at the same time, there are also sufficient other components in the first ink sublayer 201 to react to form a clear character pattern, and the shell 1 has excellent comprehensive performance and strong market competitiveness. Specifically, the total mass proportion of the light-absorbing particles 21 in the first ink sublayer can be but is not limited to 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%. It can be understood that in other embodiments, multiple light-absorbing particles 21 are dispersed in the entire ink layer 20, and at this time, the total mass proportion of the light-absorbing particles 21 in the ink layer 20 is 5%-30%.

[0051] In some embodiments of the present application, the thickness of the first ink sublayer 201 is 3 μm-5 μm. In this way, the effect of the light absorbing particles 21 can be exerted and a clear character pattern can be formed, while the production cost of the housing 1 can be effectively controlled. Specifically, the thickness of the first ink sublayer 201 can be, but is not limited to, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.8 μm, and 5 μm.

[0052] In order to take into account the thinness of the housing 1 and improve the market competitiveness of the terminal device, in some embodiments of the present application, the thickness of the ink layer 20 is 10μm-25μm. Specifically, the thickness of the ink layer can be but is not limited to 10μm, 12μm, 15μm, 18μm, 20μm, 22μm, 25μm. In the embodiment of the present application, the thickness of the second ink sublayer 202 is not limited.

[0053] In some embodiments of the present application, the ink layer 20 is a non-patterned ink layer. That is, the ink layer 20 is not irradiated with a laser having a wavelength of 532 nm. At this time, the particle size of the light-absorbing particles 21 is 50 nm-200 nm. In this way, the light-absorbing particles 21 are evenly dispersed in the ink layer 20. Specifically, the particle size of the light-absorbing particles 21 can be, but is not limited to, 50 nm, 80 nm, 100 nm, 120 nm, 150 nm, 180 nm, and 200 nm. In an embodiment of the present application, the particle size of the light-absorbing particles 21 can be tested by SEM. Alternatively, the particle size of the light-absorbing particles 21 can be determined by SEM-EDS.

[0054] As described above, the light-absorbing particles 21 can absorb the photon energy of the laser with a wavelength of 532nm and melt, reorganize and break. In some embodiments of the present application, when the non-patterned ink layer is transformed into a patterned ink layer by the above-mentioned laser irradiation, the particle size of at least part of the light-absorbing particles 21 in the patterned ink layer is 10nm-30nm. Specifically, at this time, the particle size of the light-absorbing particles 21 can be, but not limited to, 10nm, 12nm, 15nm, 18nm, 20nm, 22nm, 25nm, 28nm, 30nm. It should be noted that since the above-mentioned laser irradiation is usually carried out in the whole machine state of the terminal device, the ink layer 20 is solid, and even if the light-absorbing particles 21 are broken, they appear as light-absorbing particles with cracks, and obvious cracks can be seen under SEM or TEM. That is, in the patterned ink layer 20, at least part of the light-absorbing particles 21 have cracks; that is, the light-absorbing particles 21 are broken into multiple small particles. At this time, the particle size of the small particles is 10 nm-30 nm, that is, in some specific embodiments, the particle size of at least part of the light absorbing particles 21 is 10 nm-30 nm.

[0055] In some embodiments of the present application, the substrate layer 10 includes a stacked polymethyl methacrylate (PMMA) layer and a polycarbonate (PC) layer; wherein the PMMA layer is disposed on the surface of the PC layer away from the ink layer 20. The PMMA layer has high hardness and wear resistance, and the PC layer can improve the toughness of the housing 1. In some specific embodiments of the present application, the thickness of the PC layer is 0.4 mm-0.8 mm; the thickness of the PMMA layer is 40 μm-60 μm.

[0056] In some implementations of this application, please see Figure 4, the housing 1 also includes a silk screen layer 30 and a texture layer 40 stacked between the substrate layer 10 and the ink layer 20, and the silk screen layer 30 is arranged close to the substrate layer 10. Among them, the silk screen layer 30 is used to display the brand logo of the terminal device. In some specific embodiments, the silk screen layer 30 is arranged in a local area of ​​the housing 1. The texture layer 40 can enrich the appearance of the housing 1. In order to take into account the performance and lightness of the housing 1, in some specific embodiments, the thickness of the texture layer 40 is 10μm-20μm. In the embodiment of the present application, the material of the silk screen layer 30 and the texture layer 40 can be any material known in the art that is suitable for the silk screen layer 30 and the texture layer 40, and the texture layer 40 can be transparent to a laser with a wavelength of 532nm. In some specific embodiments, the texture layer 40 is an ultraviolet light curing (UV) texture layer.

[0057] In some other implementations of this application, please see Figure 5 The shell 1 also includes a silk screen layer 30, a texture layer 40 and an electroplating layer 50 stacked between the substrate layer 10 and the ink layer 20, and the silk screen layer 30 is arranged close to the substrate layer 10. The electroplating layer 50 can give the shell 1 a shining gloss and improve the wear resistance of the shell 1. In the embodiment of the present application, there is no requirement for the thickness of the electroplating layer 50, and those skilled in the art can choose it according to actual needs. In the embodiment of the present application, the material of the electroplating layer 50 can be selected from materials well known to those skilled in the art, such as metals, metal oxides, etc., which can transmit a laser with a wavelength of 532nm.

[0058] In some implementations of this application, please see Figures 4 to 5 The shell 1 also includes a hardening layer 60 (Hard Coating, HC), which can improve the hardness and wear resistance of the shell 1 and enrich the appearance of the shell 1. In the embodiment of the present application, the material of the hardening layer 60 can be selected from materials well known to technicians in the field, such as organic silane, multi-functional modified acrylate, etc., which can transmit a laser with a wavelength of 532nm. In some specific embodiments, the thickness of the hardening layer 60 is 8μm-10μm. It should be noted that in this field, the hardening layer 60 is also called the outer corrugation layer.

[0059] In some specific embodiments of this application, please see Figure 6 The housing 1 includes a hardening layer 60, a polymethyl methacrylate layer 101, a polycarbonate layer 102, a silk-screen layer 30, a texture layer 40, a second ink sub-layer 202 and a first ink sub-layer 201 which are stacked in sequence. In other specific embodiments, see Figure 7 The housing 1 includes a hardening layer 60, a polymethyl methacrylate layer 101, a polycarbonate layer 102, a silk screen layer 30, a texture layer 40, an electroplating layer 50, a second ink sub-layer 202 and a first ink sub-layer 201 which are stacked in sequence.

[0060] In order to ensure the lightness and thinness of the shell 1 and improve its market competitiveness, in some implementations of the present application, the total thickness of the shell 1 is ≤0.5 mm.

[0061] The present application also provides a method for preparing a housing, which can be used to prepare the housing 1 provided in the present application, comprising:

[0062] S01. An ink slurry containing a plurality of light-absorbing particles is disposed on one surface of a substrate to form a non-patterned ink layer to obtain a shell; wherein the light-absorbing particles can be broken by irradiation with a laser having a wavelength of 532 nm.

[0063] The preparation method is simple and easy to implement, has reliable process and high production efficiency, and is suitable for large-scale industrial production.

[0064] It is understandable that in the commonly used processes in the field, the non-patterned ink layer generally requires multiple coatings of ink slurry, for example, 3-5 coatings, and the thickness of a single coating is 3μm-5μm. In the embodiment of the present application, in step S01, an ink slurry containing multiple light-absorbing particles is disposed on one surface of the substrate to form a non-patterned ink layer, including:

[0065] Ink slurry is stacked on one surface of the substrate in multiple layers, and each ink slurry is an ink slurry containing multiple light-absorbing particles to form a non-patterned ink layer; for the convenience of description, the first ink slurry is defined as an ink slurry containing multiple light-absorbing particles.

[0066] Alternatively, the ink slurry is stacked on the surface of one side of the substrate for multiple times, wherein the ink slurry set at least once is the first ink slurry to form at least one of the aforementioned first ink sub-layers, and the ink slurry set at least once is the second ink slurry without light-absorbing particles to form at least one of the aforementioned second ink sub-layers to obtain an ink layer; at this time, the ink layer in the shell finally obtained includes at least one of the aforementioned first ink sub-layers and at least one of the aforementioned second ink sub-layers stacked. In the embodiment of the present application, a curing treatment is included after each setting of the ink slurry (for example, coating the ink slurry), so that the set ink slurry is cured and formed, and then the subsequent setting of the ink slurry is performed. In some embodiments of the present application, when the thickness of a single second ink sub-layer or a single first ink sub-layer is large, it can also be prepared in multiple times.

[0067] In the embodiment of the present application, the above-mentioned process of setting the ink slurry includes but is not limited to coating, spraying, etc.

[0068] In some embodiments of the present application, the preparation of the first ink slurry includes: mixing light-absorbing particles with ink slurry. The present application embodiment does not limit the above-mentioned mixing process, which can be a mixing process commonly used by technicians in the field. In some specific embodiments, in order to make the light-absorbing particles uniformly dispersed in the ink slurry, the above-mentioned mixing process is ball milling mixing. It can be understood that the ink slurry before mixing with the light-absorbing particles and the second ink slurry can be any ink slurry suitable for the shell ink layer that is well known in the field, and the present application embodiment does not limit its components and component ratios. For example, the ink slurry can include a prepolymer of a resin matrix, a functional filler, a pigment, a dispersant, a curing agent, a solvent, etc. Exemplarily, the prepolymer of the resin matrix can be selected from a prepolymer of a modified or unmodified acrylic resin; the functional filler can be selected from talcum powder and barium sulfate; the curing agent is used to promote the polymerization and curing of the prepolymer of the resin matrix. In the embodiment of the present application, the components and ratios of the ink slurry before mixing with the light-absorbing particles and the second ink slurry can be the same or different.

[0069] In some embodiments of the present application, the total mass of the plurality of light absorbing particles accounts for 5%-30% of the mass of the first ink slurry.

[0070] In some embodiments of the present application, the material of the light absorbing particles includes one or more of nickel titanate, cobalt titanate, tin disulfide, cerium trisulfide and perovskite.

[0071] In some embodiments of the present application, in step S01, the particle size of the light absorbing particles is 50nm-200nm. Controlling the particle size of the light absorbing particles within the above range can effectively reduce the risk of agglomeration of the light absorbing particles in the ink slurry, and obtain a uniform and stable first ink slurry, thereby improving the uniformity of the final ink layer or the first ink sublayer. In the embodiment of the present application, in step S01, a laser particle size analyzer can be used to test the particle size of the light absorbing particles.

[0072] It can be understood that the substrate includes a first surface and a second surface that are arranged opposite to each other. For the convenience of description, the first surface is defined as the surface of the substrate used to carry the ink layer. In some embodiments of the present application, the second surface of the substrate is provided with a hardening layer (i.e., an outer grain layer). In some embodiments of the present application, the substrate includes a polymethyl methacrylate layer and a polycarbonate layer that are stacked. In this case, the surface of the polycarbonate layer that is away from the polymethyl methacrylate layer is the above-mentioned first surface, and the surface of the polymethyl methacrylate layer that is away from the polycarbonate layer is the above-mentioned second surface.

[0073] In some embodiments of the present application, in step S01, before providing the ink slurry containing a plurality of light absorbing particles, the method further includes:

[0074] S011, screen printing a brand logo on the second surface of the substrate to form a screen printing layer;

[0075] S012, forming a texture layer on the first surface of the substrate; or, sequentially forming a texture layer and an electroplating layer on the first surface of the substrate. In the embodiment of the present application, the above-mentioned silk-screen layer, texture layer and electroplating layer can be prepared by processes and process parameters well known to technicians in the field, and the present application does not limit this.

[0076] In some embodiments of the present application, step S02 is also included: the material obtained in step S01 is subjected to high pressure forming, and a hardened layer is formed on the surface of the silk-screen layer to obtain a shell. The high pressure forming process can adopt processes and parameters well known to technicians in the field, and the high pressure forming process forms the material obtained in step S01 into a sheet with a certain shape; the hardened layer can be prepared by a coating process.

[0077] In a specific embodiment, the preparation of the shell includes:

[0078] S011, screen printing a brand logo on the second surface of the substrate to form a screen printing layer;

[0079] S012, forming a texture layer on the first surface of the substrate;

[0080] S013, coating a second ink slurry on the surface of the texture layer facing away from the substrate, and repeating the coating for 2-4 layers, and then coating the first ink slurry;

[0081] S02, performing high pressure forming processing on the material obtained in step S013, and then coating a hardening layer on the surface of the silk-screen layer away from the substrate layer to obtain a shell.

[0082] In another specific embodiment, the preparation of the shell includes:

[0083] S011, screen printing a brand logo on the second surface of the substrate to form a screen printing layer;

[0084] S012, sequentially forming a texture layer and an electroplating layer on the first surface of the substrate;

[0085] S013, coating the second ink slurry on the surface of the electroplating layer away from the substrate, and repeating the coating for 2-4 layers, and then coating the first ink slurry;

[0086] S02, performing high pressure forming processing on the material obtained in step S013, and then coating a hardening layer on the surface of the silk-screen layer away from the substrate layer to obtain a shell.

[0087] In some embodiments of the present application, step S03 is also included: using a laser with a wavelength of 532nm to irradiate the non-patterned ink layer to form a character pattern, thereby obtaining a patterned ink layer. Specifically, a laser processing process can be used to engrave the character pattern on the non-patterned ink layer. Figure 8 As shown, the cross section of the shell is the cross section obtained by cutting the shell with any plane parallel to the thickness direction of the shell, and the area selected by the white dotted line is the ink layer; it can be seen that the ink layer has no bulging and splitting phenomenon, which is due to the fact that during the above laser irradiation process, at least some of the light-absorbing particles absorb photon energy and break, thereby inhibiting the bulging and splitting of the ink layer. At this time, the particle size of at least some of the light-absorbing particles is 10nm-30nm. Please refer to Fig.9A and Fig. 9B , Fig.9A This is a TEM photo of the light-absorbing particle dispersion before being irradiated by a laser with a wavelength of 532 nm. Fig. 9B This is a TEM photo of the light-absorbing particle dispersion after being irradiated by a laser with a wavelength of 532 nm. Fig.9A and Fig. 9B It can be seen that before and after the above-mentioned laser irradiation with a wavelength of 532 nm, the particle size of the light-absorbing particles is significantly reduced, indicating that the light-absorbing particles absorb photon energy, melt, reorganize and break.

[0088] In the embodiment of the present application, no matter whether the light-absorbing particles are dispersed in the first ink sublayer or in the entire non-patterned ink layer, when a laser with a wavelength of 532 nm is used to irradiate the ink layer, the laser is focused on the non-patterned ink layer.

[0089] In some embodiments of the present application, the energy of the laser with a wavelength of 532nm is 0.6W-3W. Specifically, the energy of the laser can be, but is not limited to, 0.6W, 0.8W, 1W, 1.2W, 1.5W, 1.8W, 2W, 2.2W, 2.5W, 2.8W, and 3W. In this way, a clear character pattern can be engraved in the shell, and the ink layer bulging and cracking caused by excessive energy can be avoided, thereby ensuring the safety of the battery of the terminal device.

[0090] It is understandable that, according to actual production conditions, the non-patterned ink layer of the shell may be irradiated with a laser having a wavelength of 532 nm after the shell is assembled to the terminal device.

[0091] The embodiment of the present application also provides a terminal device, which includes the aforementioned housing provided in the embodiment of the present application. Due to the use of the housing provided in the embodiment of the present application, the terminal device can have higher market competitiveness.

[0092] In some implementations of the present application, the above-mentioned terminal devices include but are not limited to mobile phones, tablet computers, laptop computers, smart watches and other consumer electronic products.

[0093] In the embodiments of the present application, the range value represented by “ab” includes endpoint values ​​a and b. For example, the range represented by “50nm-200nm” includes endpoint value 50nm and endpoint value 200nm.

[0094] The above is an exemplary embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made thereto without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A housing, characterized in that: It comprises a substrate layer and an ink layer arranged on one surface of the substrate layer; the substrate layer comprises a polycarbonate layer; The ink layer includes resin and pigment, and a plurality of light-absorbing particles are dispersed in the ink layer, and the light-absorbing particles can be broken by irradiation with a laser having a wavelength of 532 nm; The resin is selected from resins that can undergo physical changes to form patterns by absorbing laser radiation with a wavelength of 532 nm; the material of the light-absorbing particles includes one or more of nickel titanate, cobalt titanate, tin disulfide, cerium trisulfide and perovskite.

2. The housing according to claim 1, characterized in that The ink layer includes at least one first ink sub-layer and at least one second ink sub-layer which are stacked; the plurality of light absorbing particles are dispersed in the first ink sub-layer.

3. The housing according to claim 2, characterized in that: The thickness of the first ink sublayer is 3 μm-5 μm.

4. The housing according to claim 2, characterized in that: The total mass of the light absorbing particles accounts for 5%-30% of the total mass of the first ink sublayer.

5. The housing according to claim 3, characterized in that: The total mass of the light absorbing particles accounts for 5%-30% of the total mass of the first ink sublayer.

6. The housing according to any one of claims 1 to 5, characterized in that: The ink layer has a thickness of 10 μm-25 μm.

7. The housing according to any one of claims 1 to 5, characterized in that: It also includes a silk screen layer and a texture layer stacked between the substrate layer and the ink layer, or it also includes a silk screen layer, a texture layer and an electroplating layer stacked between the substrate layer and the ink layer; the silk screen layer is arranged close to the substrate layer.

8. The housing according to claim 6, characterized in that It also includes a silk screen layer and a texture layer stacked between the substrate layer and the ink layer, or it also includes a silk screen layer, a texture layer and an electroplating layer stacked between the substrate layer and the ink layer; the silk screen layer is arranged close to the substrate layer.

9. The housing according to any one of claims 1 to 5, characterized in that: The substrate layer further includes a polymethyl methacrylate layer stacked with the polycarbonate layer, and the polymethyl methacrylate layer is disposed on a surface of the polycarbonate layer facing away from the ink layer.

10. The housing according to claim 6, characterized in that The substrate layer further includes a polymethyl methacrylate layer stacked with the polycarbonate layer, and the polymethyl methacrylate layer is disposed on a surface of the polycarbonate layer facing away from the ink layer.

11. The housing according to claim 7, characterized in that The substrate layer further includes a polymethyl methacrylate layer stacked with the polycarbonate layer, and the polymethyl methacrylate layer is disposed on a surface of the polycarbonate layer facing away from the ink layer.

12. The housing according to claim 8, characterized in that The substrate layer further includes a polymethyl methacrylate layer stacked with the polycarbonate layer, and the polymethyl methacrylate layer is disposed on a surface of the polycarbonate layer facing away from the ink layer.

13. The housing according to any one of claims 1 to 5, characterized in that: The ink layer is a non-patterned ink layer.

14. The housing according to claim 6, characterized in that The ink layer is a non-patterned ink layer.

15. The housing according to claim 7, characterized in that The ink layer is a non-patterned ink layer.

16. The housing according to claim 8, characterized in that The ink layer is a non-patterned ink layer.

17. The housing according to claim 9, characterized in that The ink layer is a non-patterned ink layer.

18. The housing according to claim 10, characterized in that The ink layer is a non-patterned ink layer.

19. The housing according to claim 11, characterized in that The ink layer is a non-patterned ink layer.

20. The housing according to claim 12, characterized in that The ink layer is a non-patterned ink layer.

21. The housing according to claim 13, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

22. The housing according to claim 14, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

23. The housing according to claim 15, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

24. The housing according to claim 16, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

25. The housing according to claim 17, wherein: The particle size of the plurality of light absorbing particles is 50nm-200nm.

26. The housing according to claim 18, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

27. The housing according to claim 19, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

28. The housing according to claim 20, characterized in that The particle size of the plurality of light absorbing particles is 50nm-200nm.

29. The housing according to any one of claims 1 to 5, characterized in that: The ink layer is a patterned ink layer.

30. The housing according to claim 6, characterized in that The ink layer is a patterned ink layer.

31. The housing according to claim 7, characterized in that The ink layer is a patterned ink layer.

32. The housing according to claim 8, characterized in that The ink layer is a patterned ink layer.

33. The housing according to claim 9, characterized in that The ink layer is a patterned ink layer.

34. The housing according to claim 10, characterized in that The ink layer is a patterned ink layer.

35. The housing according to claim 11, characterized in that The ink layer is a patterned ink layer.

36. The housing according to claim 12, characterized in that The ink layer is a patterned ink layer.

37. The housing according to claim 29, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

38. The housing according to claim 30, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

39. The housing according to claim 31, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

40. The housing according to claim 32, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

41. The housing according to claim 33, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

42. The housing according to claim 34, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

43. The housing according to claim 35, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

44. The housing according to claim 36, characterized in that At least some of the light absorbing particles have a particle size of 10 nm to 30 nm.

45. A method for preparing a shell, characterized in that: include: An ink slurry containing a plurality of light-absorbing particles is disposed on one surface of a substrate to form a non-patterned ink layer to obtain a shell; the substrate comprises a polycarbonate layer, and the ink slurry comprises a resin and a pigment; The light-absorbing particles can be broken by irradiation with a laser having a wavelength of 532 nm; the resin and the pigment absorb the laser irradiation with a wavelength of 532 nm and undergo physical changes to form a pattern; The material of the light absorbing particles includes one or more of nickel titanate, cobalt titanate, tin disulfide, cerium trisulfide and perovskite.

46. ​​The preparation method according to claim 45, characterized in that The particle size of the light absorbing particles is 50nm-200nm.

47. The preparation method according to claim 45, characterized in that Also includes: A local area of ​​the non-patterned ink layer is irradiated with laser light having a wavelength of 532 nm to transform the non-patterned ink layer into a patterned ink layer.

48. The preparation method according to claim 46, characterized in that Also includes: A local area of ​​the non-patterned ink layer is irradiated with laser light having a wavelength of 532 nm to transform the non-patterned ink layer into a patterned ink layer.

49. The preparation method according to claim 47, characterized in that: In the patterned ink layer, at least part of the light absorbing particles have a particle size of 10 nm to 30 nm.

50. The preparation method according to claim 48, characterized in that In the patterned ink layer, at least part of the light absorbing particles have a particle size of 10 nm to 30 nm.

51. The preparation method according to any one of claims 45 to 50, characterized in that: The energy of the laser with a wavelength of 532nm is 0.6W-3W.

52. A terminal device, characterized in that: Comprising a shell as described in any one of claims 1-44.

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