Leather, shell, electronic equipment and preparation method of leather

Abstract

The invention provides leather, a shell, electronic equipment and a preparation method of the leather. The leather comprises a base material layer, a polyurethane layer and a fluorination reaction layer. A polyurethane layer is arranged on the base material layer, a fluorination reaction layer is arranged on the polyurethane layer, and the fluorination reaction layer comprises tetrafluoroethylene groups. The polyurethane layer can be well fixed on the base material layer and provides a good soft hand feeling. Compared with a silicon-based modified polyurethane resin surface protection layer, the tetrafluoroethylene group in the fluorination reaction layer has strong hydrophobic and oleophobic properties, and has a good anti-smudginess effect on oily liquids such as oily ink and coffee of the mark pen. When the oily liquid falls on the fluorination reaction layer, the oily liquid is easy to wipe and clean, smudginess traces are not obvious, and dip dyeing residues of various liquids are effectively reduced. According to the preparation method of the leather, a uniform and compact fluorination reaction layer can be easily formed on a polyurethane layer, different forms of leather textures can be effectively covered, and the leather has a good dirt-resistant effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of leather structure and leather preparation, and in particular to leather, a housing, an electronic device, and a method for preparing leather. Background Art

[0002] The housings of related electronic devices can be made of artificial simulated leather to provide a leathery feel. The leather can include a base layer, a polyurethane layer, and a surface protective layer stacked in sequence. The surface protective layer provides dirt and wear resistance. However, the surface protective layer in the related art leather only provides dirt resistance against conventional solid particles and has a poor dirt resistance against oily liquids (such as marker ink and coffee). Summary of the Invention

[0003] The embodiments of the present application provide leather, a housing, an electronic device, and a method for preparing leather, which solve the problem of poor stain resistance of leather to oily liquids in related technologies.

[0004] The embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, embodiments of the present application provide a leather comprising: a substrate layer, a polyurethane layer, and a fluorinated reaction layer. The substrate layer has a first surface and a second surface that are opposite to each other. The polyurethane layer has a third surface and a fourth surface that are opposite to each other, with the third surface of the polyurethane layer facing and connected to the first surface of the substrate layer. The fluorinated reaction layer covers the fourth surface of the polyurethane layer, and the fluorinated reaction layer includes tetrafluoroethylene groups.

[0006] The leather provided in the embodiment of the present application is provided with a polyurethane layer on a substrate layer as a carrier, and a fluorination reaction layer is provided on the polyurethane layer, and the fluorination reaction layer includes tetrafluoroethylene groups. The polyurethane layer can be well fixed on the substrate layer and provide a good soft feel. Compared with the surface protective layer of the silicon-modified polyurethane resin, the tetrafluoroethylene groups in the fluorination reaction layer of the present embodiment have a strong hydrophobic and oleophobic property, and have a good anti-fouling effect on conventional solid particles (such as lipstick) and oily liquids (such as oily ink of a marker, coffee, etc.). When the oily liquid falls on the fluorination reaction layer, the oily liquid is easy to wipe clean, and the dirt marks are not obvious, which effectively reduces the impregnation residues of various liquids.

[0007] In one optional implementation, the fluorinated reaction layer can be formed by a fluorination reaction on the fourth surface of the polyurethane layer under a fluorine and protective gas atmosphere. This effectively covers various leather textures. Even when the polyurethane layer has a deep texture (e.g., greater than 70 microns), the fluorinated reaction layer can effectively cover the bottom of the grooves in the texture, making the leather more resistant to dirt.

[0008] In one optional embodiment, the fluorination reaction layer further includes carbamate groups (-NHCOO), and the tetrafluoroethylene groups are connected to the carbamate groups. The polyurethane layer has many repeated carbamate groups, which are generated through fluorination reaction to form tetrafluoroethylene groups. The hard or soft chains in the polyurethane polymer backbone are connected to the tetrafluoroethylene groups to form covalent bonds, and the fluorination reaction layer has carbamate groups and tetrafluoroethylene groups.

[0009] In an optional implementation, the thickness of the fluorinated reaction layer can range from 3 μm to 10 μm, which can effectively cover different types of leather textures (such as small lychee grain, large lychee grain, etc.), making the leather more resistant to dirt.

[0010] In an optional implementation, the polyurethane layer may include one sublayer; or the polyurethane layer may include multiple stacked sublayers to achieve a reliable connection between the polyurethane layer and the substrate layer and provide a good soft feel.

[0011] In one optional implementation, the polyurethane layer can have a thickness ranging from 0.05 mm to 0.2 mm, which helps reduce the thickness of the leather, thereby reducing the thickness of the electronic device housing, achieving a lighter and thinner housing, and enabling the polyurethane layer to be reliably connected to the substrate layer.

[0012] In one optional implementation, the polyurethane layer includes a first sublayer and a second sublayer stacked together, each of the first sublayer and the second sublayer being 0.05 mm thick. The first sublayer has a predetermined texture, and a surface of the first sublayer facing away from the second sublayer can be fluorinated to form a fluorinated reaction layer having a texture similar to that of the first sublayer. The second sublayer is connected to the substrate layer.

[0013] In an optional implementation, the polyurethane layer has a concave-convex texture, the depth of the concave-convex texture ranges from 0.03 mm to 0.10 mm, and the depth of the concave-convex texture is less than or equal to the thickness of the polyurethane layer.

[0014] The polyurethane layer undergoes a fluorination reaction to form a uniform, dense fluorinated reaction layer, effectively covering various concave and convex textures. For polyurethane layers of varying texture depths, the fluorinated reaction layer reaches the bottom of the grooves, ensuring coverage of the polyurethane layer and providing the leather with improved stain resistance.

[0015] In an optional implementation, the material of the substrate layer may include one or more of polyester fiber, glass fiber, acrylic fiber, polyethylene terephthalate, polycarbonate, and polymethyl methacrylate. The substrate layer is easy to shape, making it easier for the polyurethane layer to be attached to the substrate layer.

[0016] In an optional implementation, the substrate layer can be a base fabric made of fiber material, such as knitted fabric or non-woven fabric. Knitted fabric is formed by knitting yarn or filament into coils using knitting needles, and then the coils are interwoven.

[0017] In an optional implementation, the base layer is a base fabric made of fiber, and the polyurethane layer has a predetermined color (such as black, white, red, etc.), and the polyurethane layer is arranged on the base layer. When the leather is viewed from the outside, the color of the polyurethane layer can be seen.

[0018] In an optional implementation, the substrate layer may be a composite film made of a resin material, such as polyethylene terephthalate, polycarbonate, or polymethyl methacrylate.

[0019] In one optional embodiment, the substrate layer is a composite film. The substrate layer includes a color paint layer, a varnish layer, and a texture layer stacked in sequence. The color paint layer serves as the base color of the substrate layer. A varnish layer is provided between the color paint layer and the texture layer to enhance the integration between the different layers. The texture layer is provided on the color paint layer and is light-transmissive and has a textured pattern. The texture pattern can be wavy, grid-like, or other patterns. The texture layer can be a UV transfer texture layer. The polyurethane layer is light-transmissive and is provided on the side of the texture layer facing away from the color paint layer.

[0020] In an optional implementation, the thickness of the substrate layer can range from 0.1 mm to 0.5 mm. A smaller thickness of the substrate layer is beneficial for reducing the thickness of the leather, thereby reducing the thickness of the electronic device housing and achieving a lighter and thinner housing.

[0021] In one alternative embodiment, the leather can be dark or light. Dark colors are dull, heavy colors. Light colors are bright, lively colors. Dark colors can include black, dark blue, brown, dark green, cyan, etc. Light colors can include white, yellow, pink, sky blue, light green, etc.

[0022] In an optional implementation, the base material layer is a base cloth made of fibers, and the polyurethane layer has a predetermined color, and the color of the polyurethane layer can be seen from the outside of the leather.

[0023] In an optional implementation, the substrate layer is a composite film, the color paint layer of the substrate layer has a predetermined color, the polyurethane layer is light-transmissive, and the color of the color paint layer can be seen from the outside of the leather.

[0024] In a second aspect, an embodiment of the present application provides a housing, comprising a bottom shell and the above-mentioned leather, wherein the second surface of the substrate layer is connected to the bottom shell.

[0025] The housing provided in the embodiments of this application uses a bottom shell as a leather carrier. The tetrafluoroethylene groups in the leather's fluorinated layer possess strong hydrophobic and oleophobic properties, providing excellent stain resistance against both conventional solid particles (such as lipstick) and oily liquids (such as marker ink and coffee). When oily liquids land on the fluorinated layer, they are easily wiped clean, leaving no noticeable stains, effectively reducing residual stains from various liquids.

[0026] In one optional implementation, the bottom shell and the substrate layer are connected via an adhesive layer. Providing the adhesive layer between the bottom shell and the substrate layer can achieve a stable and reliable connection between the bottom shell and the substrate layer. The thickness of the adhesive layer can range from 0.02 mm to 0.10 mm.

[0027] In an optional implementation, the bottom shell and the base layer are connected by resin in the bottom shell. After the resin in the bottom shell is cured, the base layer in the leather and the bottom shell are connected by the resin in the bottom shell to form an integrated structure, thereby achieving a reliable connection between the bottom shell and the base layer.

[0028] In an optional implementation, the material of the bottom shell includes one or more of glass fiber, aramid fiber, and polyimide fiber. These fibers have high mechanical strength.

[0029] In one optional implementation, the bottom shell may include a resin layer and one or more fiber layers, with the one or more fiber layers stacked on the resin layer. This bottom shell is easily moldable, relatively thin, and possesses a certain strength, with certain compressive, bending, and shear resistance capabilities. The fiber layer is formed by weaving a fiber material, and a resin material is applied to the fiber layer. The resin-coated fiber layer is then cured to achieve a bond between the fiber layer and the resin layer.

[0030] In an optional implementation, the thickness of the bottom shell can range from 0.2 mm to 0.8 mm, thereby reducing the thickness of the shell and achieving a lighter and thinner shell for the electronic device.

[0031] In a third aspect, embodiments of the present application provide an electronic device comprising the aforementioned housing. The housing may be a rear housing, middle frame, or front housing of the electronic device. The aforementioned housing solution can be employed in housings of various parts of the electronic device to achieve a dirt-resistant effect on the housings of various parts of the electronic device.

[0032] In an optional implementation, the electronic device may include a cover plate, a display screen, a middle frame, and a rear housing. The rear housing and the display screen are disposed on opposite sides of the middle frame, respectively. The cover plate is disposed on a side of the display screen facing away from the middle frame, with the display side of the display screen facing the cover plate.

[0033] In one optional implementation, the middle frame may include a carrier plate and a frame disposed around the carrier plate. The electronic device may also include electronic components such as a printed circuit board, a battery, and a camera, which may be disposed on the carrier plate. The frame of the back cover or middle frame may utilize the aforementioned housing solution. The fluorinated layer in the leather of the housing includes tetrafluoroethylene groups, which are highly hydrophobic and oleophobic, offering excellent stain resistance.

[0034] In a fourth aspect, an embodiment of the present application provides a method for preparing leather, comprising:

[0035] making a laminate having a substrate layer and a polyurethane layer;

[0036] The surface of the polyurethane layer facing away from the substrate layer is fluorinated in an atmosphere of fluorine gas and protective gas to form a fluorinated reaction layer, which includes tetrafluoroethylene groups.

[0037] In the leather preparation method provided in the embodiment of the present application, the protective gas (such as nitrogen) is inert to fluorine gas and the rate of the fluorination reaction can be adjusted. The polyurethane layer can form a uniform and dense fluorination reaction layer after the fluorination reaction, which can effectively cover different forms of leather textures (such as small lychee texture, large lychee texture, etc.). Even if the texture depth of the polyurethane layer is large (such as greater than 70 microns), the fluorination reaction layer can effectively cover the bottom of the groove of the texture, so that the leather has better dirt resistance. This overcomes the problem of related technologies in which the dirt resistance effect is limited by the leather texture form or texture depth when roller coating silicon-based modified polyurethane on the polyurethane layer.

[0038] In one optional implementation, fluorine gas and protective gas form a mixed gas, and the volume content of fluorine gas in the mixed gas can range from 20% to 40%. The fluorination reaction rate can be adjusted so that the fluorine gas reacts with the surface of the polyurethane layer facing away from the substrate layer to form a uniform and dense fluorinated reaction layer, achieving effective coverage of different leather textures (such as small lychee grain and large lychee grain).

[0039] In an optional implementation, the fluorination reaction temperature range may be 20 degrees Celsius to 30 degrees Celsius. The fluorination reaction rate can be adjusted so that the surface of the polyurethane layer facing away from the substrate layer reacts with fluorine gas to form a uniform and dense fluorinated reaction layer.

[0040] In an optional implementation, the pressure range of the fluorination reaction may be 0.5 MPa to 1 MPa, so that the fluorine gas fully reacts with the surface of the polyurethane layer facing away from the substrate layer to form a uniform and dense fluorination reaction layer.

[0041] In an optional implementation, the fluorination reaction time ranges from 0.5 hours to 2 hours. The fluorine gas is allowed to react with the surface of the polyurethane layer facing away from the substrate layer within a predetermined time to form a fluorination reaction layer with a predetermined thickness.

[0042] In an optional implementation, the shielding gas may be nitrogen (N2) or a rare gas. The rare gas may be helium (He), neon (Ne), argon (Ar), or the like. The shielding gas is inert to fluorine gas and can regulate the rate of the fluorination reaction, thereby facilitating the formation of a uniform and dense fluorination reaction layer.

[0043] In an optional implementation, a laminate is produced, wherein the laminate comprises a substrate layer and a polyurethane layer, specifically comprising:

[0044] Disposing a polyurethane resin on a release paper having a predetermined texture to form a polyurethane layer;

[0045] Laminating the polyurethane layer and the substrate layer;

[0046] The release paper is peeled off to form a laminate having a substrate layer and a polyurethane layer.

[0047] A polyurethane resin is coated onto a release paper with a predetermined texture as a carrier. The solvent in the resin is removed by heating and drying to form a uniform polyurethane layer. The polyurethane layer can be a single sublayer or multiple stacked sublayers. The substrate layer can be a base fabric, and the polyurethane layer and the substrate layer are laminated by roller pressing and then dried and cured. The release paper is peeled off, and the texture of the release paper is transferred to the polyurethane layer to form a laminate comprising a substrate layer and a polyurethane layer. The surface of the polyurethane layer facing away from the substrate layer can be fluorinated to form a fluorinated reaction layer. Leather produced by the dry process has good strength, good density, and strong adhesion.

[0048] In an optional implementation, a laminate is produced, wherein the laminate comprises a substrate layer and a polyurethane layer, specifically comprising:

[0049] providing a polyurethane resin on the substrate layer;

[0050] The substrate layer having the polyurethane resin is immersed in water to convert the polyurethane resin from a dissolved state to a gel state;

[0051] Embossing treatment of polyurethane resin;

[0052] The polyurethane resin is cured to form a laminate having a base material layer and a polyurethane layer.

[0053] The substrate layer can be a base fabric, onto which a polyurethane resin is coated. The substrate layer coated with the polyurethane resin is immersed in a coagulation tank filled with water. While the polyurethane resin is in a gel state, a patterned mold is used to emboss the polyurethane resin to form a predetermined texture. The substrate layer is removed and placed in a water washing tank to cure the polyurethane resin, forming a laminate comprising a substrate layer and a polyurethane layer. The surface of the polyurethane layer facing away from the substrate layer can be fluorinated to form a fluorinated layer. Leather produced using the wet process has a strong three-dimensional texture and a soft feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of the structure of leather in the related art;

[0055] Figure 2 (a) and (b) are respectively the oil-based ink of the marker and the coffee in Figure 1 Schematic diagram of the leather surface residue;

[0056] Figure 3 (a) and (b) are the front view and cross-sectional view along line AA of the small lychee pattern, respectively;

[0057] Figure 4 (a) and (b) are the front view and cross-sectional view along line BB of the large lychee pattern, respectively;

[0058] Figure 5 A schematic diagram of the structure of the leather provided in the embodiment of the present application;

[0059] Figure 6 for Figure 5 Microscopic diagram of the polyurethane layer and fluorination reaction layer in leather;

[0060] Figure 7 (a) and (b) are schematic diagrams showing that oil-based ink of a marker and coffee are left without residue after being wiped on the leather surface of the embodiment of the present application;

[0061] Figure 8 A schematic structural diagram of leather provided in another embodiment of the present application;

[0062] Figure 9 A schematic structural diagram of leather provided in another embodiment of the present application;

[0063] Figure 10 A schematic structural diagram of a housing provided in an embodiment of the present application;

[0064] Figure 11 A schematic structural diagram of a housing provided in another embodiment of the present application;

[0065] Figure 12 A schematic structural diagram of a housing provided in another embodiment of the present application;

[0066] Figure 13 An exploded schematic diagram of an electronic device provided in an embodiment of the present application;

[0067] Figure 14 A flow chart of the leather preparation method provided in the embodiments of the present application;

[0068] Figure 15 A flow chart of part of the leather preparation method provided in the examples of this application;

[0069] Figure 16 This is a flow chart of a partial method for preparing leather provided in another embodiment of the present application.

[0070] Description of reference numerals:

[0071] 1-leather; 2-base material layer; 3-polyurethane layer; 4-surface protection layer;

[0072] 10-leather; 11-base material layer; 11a-first surface; 11b-second surface; 111-base fabric; 112-color paint layer; 113-varnish layer; 114-texture layer; 12-polyurethane layer; 12a-third surface; 12b-fourth surface; 121-sublayer; 121a-first sublayer; 121b-second sublayer; 121c-third sublayer; 122-concave-convex texture; 13-fluorinated reaction layer;

[0073] 20- bottom shell; 30- adhesive layer; 100- shell;

[0074] 200-cover; 300-display; 400-middle frame; 410-carrying board; 420-frame; 500-back cover; 600-printed circuit board; 1000-electronic equipment. DETAILED DESCRIPTION

[0075] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application. Although the description of this application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of introducing the application in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of this application. In order to provide an in-depth understanding of the application, the following description will contain many specific details. This application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of this application, some specific details will be omitted in the description. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other unless there is a conflict.

[0076] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0077] It should be understood that in the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The orientation or positional relationship indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0079] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0080] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0081] See also Figure 1A leather 1 in the related art includes a substrate layer 2, a polyurethane layer 3, and a surface protection layer 4 stacked in sequence. The surface protection layer 4 may be made of a silicon-based modified polyurethane resin and may be applied to the polyurethane layer 3 by roller coating. This surface protection layer 4 can only resist staining against conventional solid particles (such as lipstick), but has a poor stain resistance against oily liquids (such as oily ink from markers, coffee, etc.). After the oily liquid impregnates the surface protection layer 4, it is difficult to wipe clean, and there are obvious stain marks. In particular, when the oily liquid falls on the light-colored polyurethane layer 3, the stain marks are more obvious. Figure 2 (a) and (b) in the figure respectively show the residues of oil-based ink of a marker and coffee on the surface of leather 1.

[0082] The leather may have a concave and convex texture, e.g. Figure 3 The small lychee pattern shown in (a) and (b) is as follows: Figure 4 The large lychee pattern shown in (a) and (b) above, etc. Figure 3 (b) shows the texture depth L1 of the small lychee pattern. Figure 4 (b) shows the texture depth L2 of a large lychee grain. The texture depth L2 of a large lychee grain (e.g., 65 to 85 microns) is greater than the texture depth L1 of a small lychee grain (e.g., 35 to 45 microns). The anti-fouling effect of the surface protection layer 4 is limited by the leather's grain form and depth. For leather with a smaller texture depth, the surface protection layer 4 can achieve better anti-fouling effects. For leather with a larger texture depth, the surface protection layer 4 has poor anti-fouling effects.

[0083] When coating the surface protection layer 4 material on the textured polyurethane layer 3, if the texture depth of the polyurethane layer 3 is large (e.g., greater than 70 microns), the surface protection layer 4 material is not easy to penetrate into the bottom of the texture grooves, and the surface protection layer 4 has a poor covering effect on the polyurethane layer 3. The bottom of the texture grooves is not covered by the surface protection layer 4, which puts the leather 1 at risk of getting dirty.

[0084] Alternatively, after the surface protection layer 4 is provided on the polyurethane layer 3, a patterned mold is used to emboss the surface protection layer 4 to form a texture. If the texture is deep, the surface protection layer 4 is easily damaged by the mold, and the bottom of the texture groove is not covered by the surface protection layer 4, which may cause the leather 1 to be contaminated.

[0085] See Figure 5 and Figure 6The present invention provides a leather 10 comprising a substrate layer 11, a polyurethane layer 12, and a fluorinated reaction layer 13. The substrate layer 11 comprises a first surface 11a and a second surface 11b, which are opposed to each other. The polyurethane layer 12 comprises a third surface 12a and a fourth surface 12b, which are opposed to each other. The third surface 12a of the polyurethane layer 12 faces and is connected to the first surface 11a of the substrate layer 11. The fluorinated reaction layer 13 covers the fourth surface 12b of the polyurethane layer 12, and the fluorinated reaction layer 13 comprises tetrafluoroethylene groups.

[0086] The polyurethane (PU) in the polyurethane layer 12, also known as polyurethane, can be formed by reacting polyisocyanates with polyols. The main chain of the polyurethane polymer contains numerous repeating carbamate groups (-NHCOO). Polyurethane exhibits excellent stability, chemical resistance, resilience, and mechanical properties.

[0087] The tetrafluoroethylene group (-C2F4) is a fluorine-containing group with strong hydrophobicity and oleophobicity. It is resistant to various organic solvents and is almost insoluble in all solvents. The structural formula of the tetrafluoroethylene group is as follows:

[0088]

[0089] Wherein, n is an integer greater than 1.

[0090] The leather 10 provided in the embodiment of the present application has a polyurethane layer 12 arranged on a substrate layer 11 as a carrier, and a fluorination reaction layer 13 is arranged on the polyurethane layer 12, and the fluorination reaction layer 13 includes tetrafluoroethylene groups. The polyurethane layer 12 can be well fixed on the substrate layer 11 and provide a good soft feel. Compared with the surface protective layer of the silicon-based modified polyurethane resin, the tetrafluoroethylene groups in the fluorination reaction layer 13 of this embodiment have strong hydrophobicity and oleophobicity, and have good stain resistance to conventional solid particles (such as lipstick) and oily liquids (such as oily ink of a marker, coffee, etc.). When the oily liquid falls on the fluorination reaction layer 13, the oily liquid is easy to wipe clean, and the dirt marks are not obvious, which effectively reduces the impregnation residues of various liquids. Figure 7 (a) and (b) in the figure respectively show that there is no residue left after the oil-based ink of the marker and coffee are wiped on the surface of the leather 10.

[0091] When setting the fluorination reaction layer 13, refer to Figure 5 and Figure 6 The fluorination reaction layer 13 can be formed by a fluorination reaction of the fourth surface 12b of the polyurethane layer 12 in an atmosphere of fluorine and a protective gas. Fluorine is chemically very active and has strong oxidizing properties. With the exception of perfluorinated compounds, almost all organic and inorganic substances react with fluorine. The protective gas (e.g., nitrogen) is inert to fluorine and can regulate the rate of the fluorination reaction.

[0092] The fourth surface 12b of the polyurethane layer 12 can form a uniform and dense fluorinated reaction layer 13 after fluorination, which can effectively cover the textures of different types of leather 10, such as Figure 3 The small lychee pattern shown in (a) and (b) is as follows: Figure 4 Even if the texture depth of the polyurethane layer 12 is large (e.g., greater than 70 microns), the fluorinated reaction layer 13 can effectively cover the bottom of the groove of the texture, making the leather 10 have a better dirt resistance. Figure 1 In the related art shown, when a silicon-based modified polyurethane is roller-coated on a polyurethane layer, the anti-fouling effect is limited by the problem of leather texture form or texture depth.

[0093] In some embodiments, see Figure 5 and Figure 6 The fluorinated reaction layer 13 also includes carbamate groups (-NHCOO), and the tetrafluoroethylene groups are connected to the carbamate groups. The polyurethane layer 12 has many repeated carbamate groups, which are generated through fluorination reaction to form tetrafluoroethylene groups. The hard chains or soft chains in the polyurethane polymer backbone are connected to the tetrafluoroethylene groups to form covalent bonds. The fluorinated reaction layer 13 has carbamate groups and tetrafluoroethylene groups.

[0094] The polyurethane polymer backbone is composed of a mosaic of hard and soft chains. The soft chains, also known as flexible chains, are primarily composed of oligomeric polyols (such as polyesters, polyethers, and polybutadiene). The hard chains, also known as rigid chains, are primarily composed of the reaction products of diisocyanates (such as toluene diisocyanate and diphenylmethane diisocyanate) and small molecule chain extenders (such as diamines and diols). The soft chains account for a larger proportion than the hard chains. Both hard and soft chains react with fluorine gas to form tetrafluoroethylene groups.

[0095] When setting the thickness of the fluorination reaction layer 13, refer to Figure 5 and Figure 6 The thickness D1 of the fluorinated reaction layer 13 can range from 3 microns (μm) to 10 μm. The fluorinated reaction layer 13 having the aforementioned thickness range can be easily formed through the fluorination reaction, effectively covering various textures of the leather 10 (e.g., small lychee grain, large lychee grain, etc.), thereby providing the leather 10 with improved stain resistance.

[0096] For example, the thickness D1 of the fluorination reaction layer 13 may be 3um, 4um, 5um, 6um, 8um, 10um, etc., which may be set as required.

[0097] When setting the polyurethane layer 12, refer to Figure 8 , the polyurethane layer 12 may include a sublayer 121; or, see Figure 5The polyurethane layer 12 may include a plurality of stacked sub-layers 121. The polyurethane layer 12 may be configured as one or more sub-layers 121 as needed to achieve a reliable connection between the polyurethane layer 12 and the substrate layer 11 and provide a good soft feel.

[0098] For example, see Figure 8 A layer of polyurethane resin is coated on a release paper having a predetermined texture. After heating, drying, and cooling, the release paper is peeled off to form a polyurethane layer 12 having a sublayer 121. The texture of the release paper is transferred to the sublayer 121. Opposite sides of the sublayer 121 form a third surface 12a and a fourth surface 12b, respectively.

[0099] For example, see Figure 5 A first layer of polyurethane resin is coated on a release paper having a predetermined texture. After heating, drying, and cooling, a first sub-layer 121a is formed, and the texture of the release paper is transferred to the first sub-layer 121a. A second layer of polyurethane resin is coated on the first sub-layer 121a, and the second layer of polyurethane resin is bonded to the substrate layer 11. After heating, drying, and cooling, a second sub-layer 121b connected to the first sub-layer 121a and the substrate layer 11 is formed. After peeling off the release paper, the first sub-layer 121a and the second sub-layer 121b form the polyurethane layer 12. The first sub-layer 121a provides a soft feel, and the second sub-layer 121b facilitates connection with the substrate layer 11. The side of the second sub-layer 121b facing away from the first sub-layer 121a forms the third surface 12a, and the side of the first sub-layer 121a facing away from the second sub-layer 121b forms the fourth surface 12b.

[0100] For example, see Figure 9 A first layer of polyurethane resin is coated on a release paper with a predetermined texture, and after heating, drying, and cooling, a first sub-layer 121a is formed, and the texture of the release paper is transferred to the first sub-layer 121a. A second layer of polyurethane resin is coated on the first sub-layer 121a, and after heating, drying, and cooling, a second sub-layer 121b is formed. A third layer of polyurethane resin is coated on the second sub-layer 121b, and the third layer of polyurethane resin is bonded to the substrate layer 11. After heating, drying, and cooling, a third sub-layer 121c connected between the second sub-layer 121b and the substrate layer 11 is formed. After peeling off the release paper, the first sub-layer 121a, the second sub-layer 121b, and the third sub-layer 121c are stacked in sequence to form the polyurethane layer 12. The first sub-layer 121a provides a soft feel, the second sub-layer 121b is connected between the first sub-layer 121a and the third sub-layer 121c, and the third sub-layer 121c facilitates connection with the substrate layer 11. The side of the third sub-layer 121c facing away from the second sub-layer 121b forms a third surface 12a, and the side of the first sub-layer 121a facing away from the second sub-layer 121b forms a fourth surface 12b.

[0101] When setting the thickness of the polyurethane layer 12, refer to Figure 5 and Figure 6 The thickness D2 of the polyurethane layer 12 can be in the range of 0.05 mm to 0.2 mm. Setting the thickness D2 of the polyurethane layer 12 in the above range helps reduce the thickness of the leather 10, thereby reducing the thickness of the electronic device housing, achieving a lighter and thinner housing, and ensuring that the polyurethane layer 12 is reliably connected to the substrate layer 11.

[0102] For example, the thickness D2 of the polyurethane layer 12 may be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.12 mm, 0.2 mm, etc., and may be set as required.

[0103] For example, see Figure 5 The polyurethane layer 12 includes a first sublayer 121a and a second sublayer 121b stacked together, each having a thickness of 0.05 mm. The first sublayer 121a has a predetermined texture. The surface of the first sublayer 121a facing away from the second sublayer 121b can undergo a fluorination reaction to form a fluorinated reaction layer 13. The fluorinated reaction layer 13 has a texture similar to that of the first sublayer 121a. The second sublayer 121b is connected to the substrate layer 11.

[0104] In order to form a predetermined texture on the surface of the leather 10, in some embodiments, refer to Figure 6 The polyurethane layer 12 has a concave-convex texture 122. The depth L of the concave-convex texture 122 ranges from 0.03 mm to 0.10 mm and is less than or equal to the thickness D2 of the polyurethane layer 12. The concave-convex texture 122 can be a small lychee pattern, a large lychee pattern, or other pattern. The depth L of the concave-convex texture 122 refers to the height difference between adjacent peaks and valleys of the concave-convex texture 122 and can be calculated by using the height differences between three or more adjacent peaks and valleys.

[0105] The polyurethane layer 12 undergoes a fluorination reaction to form a uniform and dense fluorinated reaction layer 13, effectively covering the various concave and convex textures 122. For polyurethane layers 12 with varying texture depths L, the fluorinated reaction layer 13 reaches the bottom of the grooves within the texture, ensuring coverage of the polyurethane layer 12 and providing the leather 10 with improved stain resistance.

[0106] When setting the material of the base material layer 11, refer to Figure 5 The material of the substrate layer 11 may include one or more of polyester fiber, glass fiber, acrylic fiber, polyethylene terephthalate, polycarbonate, and polymethyl methacrylate. The substrate layer 11 of the above materials is easy to shape, making it easier for the polyurethane layer 12 to be attached to the substrate layer 11.

[0107] In some embodiments, see Figure 5The substrate layer 11 can be a base fabric 111 made of a fiber material, such as a knitted fabric or a non-woven fabric. Knitted fabric is formed by knitting yarn or filaments into coils using knitting needles and then interlacing the coils. Non-woven fabric is formed by aligning or randomly arranging fibers and then reinforcing them mechanically, thermally, or chemically. The fiber material can be polyester, glass, acrylic, or the like.

[0108] Polyester, commonly known as terylene, is a synthetic fiber made from the chemical polycondensation of organic dibasic acids and diols. Polyester fiber exhibits excellent wrinkle resistance and shape retention, high strength, elastic recovery, and abrasion resistance.

[0109] Glass fiber is an inorganic non-metallic material, the main components of which are silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. Glass fiber has the characteristics of good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength.

[0110] Acrylic fiber, also known as polyacrylonitrile fiber, is a synthetic fiber made from polyacrylonitrile or acrylonitrile copolymer with an acrylonitrile content greater than 85%. Acrylic fiber has good elasticity.

[0111] For example, see Figure 5 The base material layer 11 is a base fabric 111 made of fiber, and the polyurethane layer 12 has a predetermined color (such as black, white, red, etc.). The polyurethane layer 12 is provided on the base material layer 11. When looking at the leather 10 from the outside, that is, Figure 5 From top to bottom, the color of the polyurethane layer 12 can be seen.

[0112] In some embodiments, see Figure 10 The substrate layer 11 may be a composite film made of a resin material, such as polyethylene terephthalate (PET), polycarbonate (PC), or polymethyl methacrylate (PMMA).

[0113] For example, see Figure 10 The substrate layer 11 is a composite film. It includes a color paint layer 112, a varnish layer 113, and a texture layer 114, stacked in sequence. The color paint layer 112 serves as the base color for the substrate layer 11 and can be black, white, red, or other colors. The varnish layer 113 is positioned between the color paint layer 112 and the texture layer 114 to enhance the bonding between the different layers. The varnish layer 113 can be made of various transparent resins.

[0114] The texture layer 114 is provided on the color paint layer 112. The texture layer 114 is light-transmissive and has a texture pattern. The texture pattern can be wavy, grid-like, etc. The texture layer 114 can be an ultraviolet (UV) transfer texture layer. The polyurethane layer 12 is light-transmissive and is provided on the side of the texture layer 114 facing away from the color paint layer 112. When viewed from the outside, the leather 10 is Figure 10 From top to bottom, the color of the color paint layer 112 can be seen.

[0115] When setting the thickness of the base material layer 11, refer to Figure 5 The thickness D3 of the substrate layer 11 can be in the range of 0.1 mm to 0.5 mm. By providing the substrate layer 11 within the above thickness range, the thickness D3 of the substrate layer 11 is reduced, which helps reduce the thickness of the leather 10, thereby reducing the thickness of the electronic device housing and achieving a lighter and thinner housing.

[0116] For example, the thickness D3 of the substrate layer 11 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., and may be set as required.

[0117] When setting the color of the leather 10, the leather 10 can be dark or light. Dark colors are dull, heavy colors. Light colors are bright, lively colors. Dark colors can include black, dark blue, brown, dark green, cyan, etc. Light colors can include white, yellow, pink, sky blue, light green, etc.

[0118] See Figure 5 In the case where the base material layer 11 is a base fabric 111 made of fiber, the polyurethane layer 12 has a predetermined color and can be seen from the outside of the leather 10 (ie Figure 5 The color of the polyurethane layer 12 can be seen from the top to the bottom. Figure 10 In the case where the substrate layer 11 is a composite film, the color paint layer 112 of the substrate layer 11 has a predetermined color, and the polyurethane layer 12 is light-transmissive and can be viewed from the outside of the leather 10 (ie Figure 10 The color of the color paint layer 112 is seen (from top to bottom).

[0119] When using the leather 10 of this embodiment, even if the leather 10 is light-colored, the tetrafluoroethylene groups in the fluorinated reaction layer 13 of the leather 10 have strong hydrophobicity and oleophobicity, and have good stain resistance against conventional solid particles (such as lipstick) and oily liquids (such as oily ink of markers, coffee, etc.).

[0120] See Figure 11 and Figure 12 The embodiment of the present application provides a housing 100 including a bottom shell 20 and the leather 10 described above, wherein the second surface 11 b of the substrate layer 11 is connected to the bottom shell 20 .

[0121] The housing 100 provided in the embodiment of the present application, with the bottom shell 20 serving as a carrier for the leather 10, has a strong hydrophobic and oleophobic nature, resulting in excellent resistance to stains from both conventional solid particles (e.g., lipstick) and oily liquids (e.g., marker ink, coffee, etc.). When oily liquids land on the fluorinated layer 13, they are easily wiped clean, leaving no noticeable stains, effectively reducing the risk of residual stains from various liquids. Figure 7 (a) and (b) in the figure respectively show that there is no residue left after the oil-based ink of the marker and coffee are wiped on the surface of the leather 10.

[0122] There are multiple optional implementations for connecting the bottom shell 20 and the substrate layer 11 .

[0123] The first connection method between the bottom shell 20 and the substrate layer 11 is: Figure 11 The bottom shell 20 and the substrate layer 11 are connected by an adhesive layer 30. Providing the adhesive layer 30 between the bottom shell 20 and the substrate layer 11 can achieve a stable and reliable connection between the bottom shell 20 and the substrate layer 11. The thickness D4 of the adhesive layer 30 can range from 0.02 mm to 0.10 mm.

[0124] The second connection method between the bottom shell 20 and the substrate layer 11 is: Figure 12 The bottom shell 20 and the base layer 11 are connected by the resin in the bottom shell 20. After the leather 10 is made, the leather 10 and the bottom shell 20 are stacked and hot-pressed, and the resin in the bottom shell 20 is in a molten state. After the resin in the bottom shell 20 solidifies, the base layer 11 in the leather 10 and the bottom shell 20 are connected by the resin in the bottom shell 20, forming a single structure and achieving a reliable connection between the bottom shell 20 and the base layer 11.

[0125] When setting the material of the bottom shell 20, refer to Figure 11 and Figure 12 The material of the bottom shell 20 includes one or more of glass fiber, aramid fiber, and polyimide fiber. Glass fiber, aramid fiber, and polyimide fiber have high mechanical strength.

[0126] For example, the bottom shell 20 may include a resin layer and one or more fiber layers, with the one or more fiber layers stacked on the resin layer. The bottom shell 20 is easily formed, relatively thin, and possesses a certain strength, including resistance to compression, bending, and shearing. The fiber layer is formed by weaving a fiber material, and a resin material is applied to the fiber layer. The resin-coated fiber layer is then cured to achieve a bond between the fiber layer and the resin layer.

[0127] When setting the thickness of the bottom shell 20, refer to Figure 11 and Figure 12The thickness D5 of the bottom shell 20 can be in the range of 0.2 mm to 0.8 mm. Setting the thickness D5 of the bottom shell 20 in the above thickness range can reduce the thickness of the housing 100 and achieve a lighter and thinner electronic device housing 100.

[0128] Illustratively, the thickness D5 of the bottom shell 20 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, etc., and can be set as needed.

[0129] See Figure 13 The embodiment of the present application provides an electronic device 1000, comprising the aforementioned housing 100. The housing 100 may be the rear housing 500, the middle frame, or the front housing of the electronic device 1000. The housings of different parts of the electronic device 1000 may all adopt the aforementioned housing 100 solution, thereby achieving a dirt-resistant effect on the housings of different parts of the electronic device 1000.

[0130] Among them, the electronic device 1000 can be a mobile phone, a watch, a tablet computer, a laptop computer, an ultra-mobile personal computer, an e-book reader, a netbook, a personal digital assistant, an augmented reality (AR) device, a virtual reality (VR) device, an in-vehicle device, etc.

[0131] Taking the electronic device 1000 as a mobile phone as an example, refer to Figure 13 The electronic device 1000 may include a cover plate 200, a display screen 300, a middle frame 400, and a rear housing 500. The rear housing 500 and the display screen 300 are respectively disposed on opposite sides of the middle frame 400, the cover plate 200 is disposed on a side of the display screen 300 that is away from the middle frame 400, and the display side of the display screen 300 is disposed toward the cover plate 200.

[0132] When the middle frame 400 is provided, the middle frame 400 may include a carrier plate 410 and a frame 420 provided around the carrier plate 410. The electronic device 1000 may further include a printed circuit board (PCB) 600, a battery, a camera, and other electronic components, which may be provided on the carrier plate 410.

[0133] The frame 420 of the rear shell 500 or the middle frame 400 can adopt the above-mentioned shell 100 solution. The fluorinated reaction layer 13 in the leather 10 of the shell 100 includes tetrafluoroethylene groups, which have strong hydrophobicity and oleophobicity, and have good stain resistance to conventional solid particles (such as lipstick) and oily liquids (such as oily ink of marker pens, coffee, etc.).

[0134] When confirming the leather 10, housing 100, and electronic device 1000 of the embodiment of the present application, a partial slice analysis of the leather 10 and housing 100 can be performed, and an infrared analysis is performed using a Fourier transform infrared spectrometer (FTIR). The slice analysis confirms that the surface of the leather 10 has a polyurethane layer 12 and a fluorinated reaction layer 13, and the FTIR infrared analysis confirms the presence of tetrafluoroethylene groups (-C2F4). Conventional leather may use a silicon-modified polyurethane resin as a surface protective layer, or use a polyurethane substrate that has its own anti-fouling effect.

[0135] See Figure 5 、 Figure 14 , this embodiment of the application provides a method for preparing leather 10, comprising:

[0136] Step 710: manufacturing a laminate, wherein the laminate comprises a substrate layer 11 and a polyurethane layer 12;

[0137] Step 720 : The surface of the polyurethane layer 12 facing away from the substrate layer 11 is subjected to a fluorination reaction in a fluorine gas and protective gas atmosphere to form a fluorinated reaction layer 13 . The fluorinated reaction layer 13 includes tetrafluoroethylene groups.

[0138] In the preparation method of the leather 10 provided in the embodiment of the present application, the protective gas (such as nitrogen) is inert to fluorine gas and the rate of the fluorination reaction can be adjusted. The polyurethane layer 12 can form a uniform and dense fluorination reaction layer 13 after the fluorination reaction, which can effectively cover the textures of the leather 10 of different forms (such as small lychee grain, large lychee grain, etc.). Even if the texture depth of the polyurethane layer 12 is large (such as greater than 70 microns), the fluorination reaction layer 13 can effectively cover the bottom of the groove of the texture, so that the leather 10 has a better dirt resistance effect. It overcomes the problems such as Figure 1 In the related art shown, when a silicon-based modified polyurethane is roller-coated on a polyurethane layer, the anti-fouling effect is limited by the problem of leather texture form or texture depth.

[0139] When implementing the fluorination reaction, it can be carried out in a chemical reactor, which is convenient for adjusting the volume content of fluorine gas and protective gas, controlling the reaction temperature, reaction pressure and reaction time, so as to form a uniform and dense fluorination reaction layer 13 on the polyurethane layer 12.

[0140] The fluorine gas and the protective gas form a mixed gas, and the volume content of the fluorine gas in the mixed gas can range from 20% to 40%. Using the above volume content of fluorine gas and protective gas can adjust the rate of the fluorination reaction, so that the fluorine gas reacts with the surface of the polyurethane layer 12 facing away from the substrate layer 11 to form a uniform and dense fluorinated reaction layer 13, thereby effectively covering different types of leather 10 textures (such as small lychee grain and large lychee grain).

[0141] The fluorination reaction temperature may be in the range of 20°C to 30°C. Setting the fluorination reaction temperature within the room temperature range can regulate the fluorination reaction rate, allowing the surface of the polyurethane layer 12 facing away from the substrate layer 11 to react with the fluorine gas, thereby forming a uniform and dense fluorinated reaction layer 13.

[0142] The pressure range of the fluorination reaction can be 0.5 MPa to 1 MPa. Setting the pressure of the fluorination reaction within the above pressure range allows the fluorine gas to fully react with the surface of the polyurethane layer 12 facing away from the substrate layer 11 to form a uniform and dense fluorination reaction layer 13.

[0143] The fluorination reaction time ranges from 0.5 hours to 2 hours. The fluorine gas is allowed to react with the surface of the polyurethane layer 12 facing away from the substrate layer 11 within a predetermined time to form a fluorination reaction layer 13 having a predetermined thickness.

[0144] The shielding gas may be nitrogen (N2) or a rare gas. The rare gas may be helium (He), neon (Ne), argon (Ar), etc. The shielding gas is inert to fluorine gas and can regulate the rate of the fluorination reaction, thereby facilitating the formation of a uniform and dense fluorination reaction layer 13.

[0145] There are various optional implementations when making the laminate of the substrate layer 11 and the polyurethane layer 12 .

[0146] The first type of stack is realized by dry process: see Figure 5 、 Figure 15 , making a laminate, the laminate having a substrate layer 11 and a polyurethane layer 12, specifically comprising:

[0147] Step 711: Disposing a polyurethane resin on a release paper having a predetermined texture to form a polyurethane layer 12;

[0148] Step 712: Laminating the polyurethane layer 12 and the substrate layer 11;

[0149] Step 713 : peel off the release paper to form a laminate having the substrate layer 11 and the polyurethane layer 12 .

[0150] In this embodiment, a release paper with a predetermined texture is used as a carrier, and a polyurethane resin is coated on the release paper. The solvent in the resin is removed by heating and drying to form a uniform polyurethane layer 12. The polyurethane layer 12 can be a sublayer 121 or a plurality of stacked sublayers 121. The substrate layer 11 can be a base fabric 111, and the polyurethane layer 12 and the substrate layer 11 are bonded by rolling, and then dried and solidified. The release paper is peeled off, and the texture of the release paper is transferred to the polyurethane layer 12 to form a laminate having the substrate layer 11 and the polyurethane layer 12. The surface of the polyurethane layer 12 facing away from the substrate layer 11 can generate a fluorination reaction layer 13 through a fluorination reaction. The leather 10 produced by the dry process has good strength, good density and firm adhesion.

[0151] The second type of stack is achieved by wet processing: see Figure 5 、 Figure 16 , making a laminate, the laminate having a substrate layer 11 and a polyurethane layer 12, specifically comprising:

[0152] Step 711a: Disposing polyurethane resin on the substrate layer 11;

[0153] Step 712a: Immerse the substrate layer 11 having the polyurethane resin in water to transform the polyurethane resin from a dissolved state to a gel state;

[0154] Step 713a, embossing the polyurethane resin;

[0155] Step 714 a : solidify the polyurethane resin to form a laminate having a substrate layer 11 and a polyurethane layer 12 .

[0156] In this embodiment, the substrate layer 11 can be a base fabric 111. A polyurethane resin is coated on the substrate layer 11. The substrate layer 11 coated with the polyurethane resin is immersed in a coagulation tank filled with water. While the polyurethane resin is in a gel state, a mold with a patterned surface is used to emboss the polyurethane resin to form a predetermined texture. The substrate layer 11 is removed and placed in a water washing tank to cure the polyurethane resin, thereby forming a laminate comprising the substrate layer 11 and the polyurethane layer 12. The surface of the polyurethane layer 12 facing away from the substrate layer 11 can be fluorinated to form a fluorinated reaction layer 13. Leather 10 produced using the wet process has a strong three-dimensional texture and a soft feel.

[0157] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A leather, characterized in that: include: Base material layer, polyurethane layer and fluorinated reaction layer; The substrate layer has a first surface and a second surface facing each other; The polyurethane layer has a third surface and a fourth surface facing each other, and the third surface of the polyurethane layer and the first surface of the substrate layer are connected facing each other; The fluorinated reaction layer covers the fourth surface of the polyurethane layer, and the fluorinated reaction layer includes tetrafluoroethylene groups.

2. The leather according to claim 1, characterized in that The fluorination reaction layer is formed by a fluorination reaction on the fourth surface of the polyurethane layer under an atmosphere of fluorine gas and protective gas.

3. The leather according to claim 1 or 2, characterized in that The fluorinated reaction layer further includes a carbamate group, and the tetrafluoroethylene group is connected to the carbamate group; And / or, the thickness of the fluorinated reaction layer is in a range of 3 micrometers to 10 micrometers.

4. The leather according to any one of claims 1 to 3, characterized in that The polyurethane layer includes one sublayer or a plurality of sublayers arranged in a stacked manner; and / or, the polyurethane layer has a thickness ranging from 0.05 mm to 0.2 mm; And / or, the polyurethane layer has a concavo-convex texture, the depth of the concavo-convex texture ranges from 0.03 mm to 0.10 mm, and the depth of the concavo-convex texture is less than or equal to the thickness of the polyurethane layer.

5. The leather according to any one of claims 1 to 4, characterized in that The material of the substrate layer includes one or more of polyester fiber, glass fiber, acrylic fiber, polyethylene terephthalate, polycarbonate, and polymethyl methacrylate; And / or, the thickness of the substrate layer is in the range of 0.1 mm to 0.5 mm.

6. A housing, characterized in that: The leather comprises a bottom shell and the leather according to any one of claims 1 to 5, wherein the second surface of the substrate layer is connected to the bottom shell.

7. The housing according to claim 6, wherein: The bottom shell and the base material layer are connected via an adhesive layer; Alternatively, the bottom shell and the base layer are connected via resin in the bottom shell.

8. The housing according to claim 6 or 7, characterized in that: The material of the bottom shell includes one or more of glass fiber, aramid fiber, and polyimide fiber; and / or, the bottom shell has a thickness ranging from 0.2 mm to 0.8 mm; And / or, the housing is a rear housing, a front housing or a middle frame of an electronic device.

9. An electronic device, characterized in that: Comprising the housing according to any one of claims 6 to 8.

10. A method for preparing leather according to any one of claims 1 to 5, characterized in that: include: making a laminate having a substrate layer and a polyurethane layer; The surface of the polyurethane layer facing away from the substrate layer is fluorinated in an atmosphere of fluorine gas and protective gas to form a fluorinated reaction layer, and the fluorinated reaction layer includes tetrafluoroethylene groups.

11. The method for preparing leather according to claim 10, characterized in that: The fluorine gas and the protective gas form a mixed gas, and the volume content of the fluorine gas in the mixed gas ranges from 20% to 40%; and / or, the temperature range of the fluorination reaction is 20 degrees Celsius to 30 degrees Celsius; and / or, the pressure range of the fluorination reaction is 0.5 MPa to 1 MPa; and / or, the fluorination reaction time ranges from 0.5 hours to 2 hours; And / or, the protective gas is nitrogen or a rare gas.

12. The method for preparing leather according to claim 10 or 11, characterized in that: The method of making a laminate having a substrate layer and a polyurethane layer specifically comprises: providing a polyurethane resin on a release paper having a predetermined texture to form a polyurethane layer; laminating the polyurethane layer and the substrate layer; and peeling off the release paper to form a laminate having the substrate layer and the polyurethane layer. Alternatively, the method of making a laminate having a substrate layer and a polyurethane layer specifically includes: providing a polyurethane resin on the substrate layer; immersing the substrate layer having the polyurethane resin in water to convert the polyurethane resin from a dissolved state to a gel state; embossing the polyurethane resin; and curing the polyurethane resin to form a laminate having the substrate layer and the polyurethane layer.

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