Leather material, and preparation method therefor and use thereof

Abstract

Provided in the present invention are a leather material, and a preparation method therefor and the use thereof. The leather material comprises a base material and a surface layer present on at least one side of the surface of the base material, wherein the surface layer comprises a cross-linked product of a first polymer. The first polymer comprises a fluorine-containing polymer, and the fluorine-containing polymer comprises one or more of a first fluorine-containing copolymer, polyvinylidene fluoride, polyperfluorinated ethylene propylene and a second fluorine-containing copolymer, wherein the first fluorine-containing copolymer is a copolymer formed by copolymerizing chlorotrifluoroethylene and vinyl ether; and the second fluorine-containing copolymer is a copolymer formed by copolymerizing at least two monomers of tetrafluoroethylene, chlorotrifluoroethylene and vinylidene fluoride. The present invention can improve properties, such as stain resistance, wear resistance and weather resistance, of a leather material.

Description

Leather material, preparation method and application thereof

[0001] The present application claims priority to the Chinese patent application No. 202410741150.1, filed on June 7, 2024, and entitled "Leather material, preparation method and application thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to a leather material, a preparation method and an application thereof, and belongs to the field of leather materials. BACKGROUND

[0003] Synthetic leather is a substitute for natural leather, which is mainly composed of synthetic resin (coating) and substrate (base cloth) by coating, bonding and other methods. Common synthetic leather includes PVC artificial leather, PU synthetic leather, microfiber leather, and silicone synthetic leather. However, the existing synthetic leather materials generally have poor stain resistance and weather resistance, especially the light-colored leather has poor anti-stain performance, which limits its application.

[0004] For example, the leather used for soft packaging of automotive interiors is mostly PVC leather, PU leather or microfiber leather. Since the film-forming material of the leather itself has activity and the film-forming material has a porous structure microscopically, the surface has wettability and adhesion, and the dirt components can accumulate on the texture surface or penetrate and combine, especially the light-colored leather is obviously dirty.

[0005] In addition, silicone synthetic leather (silicone leather) is a new type of synthetic leather that has appeared in recent years. Its stain resistance, hydrolysis resistance and aging resistance are better than those of traditional synthetic leather materials such as PVC artificial leather, PU synthetic leather and microfiber leather. However, silicone synthetic leather still has problems such as poor wear resistance, easy dust absorption and poor adhesion. Specifically, silicone synthetic leather is mainly composed of a substrate (woven cloth, knitted cloth, non-woven cloth, etc.), a bottom layer (silicone resin) and a surface layer (silicone resin). Due to the low cross-linking degree between silicone resin chains and other factors, the wear resistance of silicone synthetic leather is poor, and it is easy to be worn and scratched. At the same time, the surface of silicone synthetic leather has high inertness, which leads to poor secondary processability, making it difficult to process the surface by silk printing and bonding, thereby limiting the application of silicone synthetic leather.

[0006] In the face of increasingly complex application scenarios, conventional synthetic leather has been difficult to meet the increasingly diverse needs, especially in application scenarios with high requirements for the stain resistance and wear resistance of synthetic leather materials, such as electronic consumer products, automobile seats, etc. Conventional leather materials (artificial leather and synthetic leather) are difficult to meet the needs, especially for light-colored leather, the limitations of its stain resistance performance easily affect the product experience. Therefore, developing new leather materials that take into account improving the stain resistance, easy cleanability and weather resistance of leather materials, is still a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0007] The present application provides a kind of leather material and its preparation method and application, can take into account improving the stain resistance, easy cleanability and weather resistance of leather materials, effectively overcome the defects existing in the prior art.

[0008] In one aspect of the present application, a leather material is provided, comprising a substrate and a surface layer present on at least one side surface of the substrate, the surface layer comprising a crosslinked product of a first polymer, the first polymer comprising a fluoropolymer, the fluoropolymer comprising one or more of a first fluorine-containing copolymer, polyvinylidene fluoride, polyperfluoroethylene propylene, and a second fluorine-containing copolymer; the first fluorine-containing copolymer is a copolymer copolymerized from chlorotrifluoroethylene and vinyl ether; the second fluorine-containing copolymer is a copolymer copolymerized from at least two monomers of tetrafluoroethylene, chlorotrifluoroethylene, and vinylidene fluoride.

[0009] According to an embodiment of the present application, the first fluorine-containing copolymer comprises an alternating copolymer copolymerized from chlorotrifluoroethylene and vinyl ether.

[0010] According to an embodiment of the present application, the crosslinked product of the first polymer is a crosslinked product formed from the first polymer in the presence of a first crosslinking agent, the first crosslinking agent comprising a main crosslinking agent and a crosslinking aid, the main crosslinking agent comprising one or more of oxygen, hexamethylene diisocyanate, toluene diisocyanate, isophorone diisocyanate, and the crosslinking aid comprising zinc oxide.

[0011] According to an embodiment of the present application, the first polymer further comprises an aqueous polyurethane; and / or, the first polymer further comprises an acrylic resin and / or an epoxy resin; and / or, at least part of the first polymer contains an acrylic group and / or an epoxy group.

[0012] According to an embodiment of the present application, the surface layer contains a first auxiliary agent, the first auxiliary agent including one or more of a first pigment, a first filler, a cross-linking auxiliary agent, a first leveling agent; the first pigment including one or more of carbon black, titanium dioxide, azo dyes; the first filler including one or more of talc, barium sulfate, silicon dioxide; the cross-linking auxiliary agent including zinc oxide; the first leveling agent including a polysiloxane leveling agent.

[0013] According to an embodiment of the present application, the surface layer has a thickness of 0.03mm to 0.06mm.

[0014] According to an embodiment of the present application, a side surface of the surface layer facing away from the substrate has a texture.

[0015] According to an embodiment of the present application, the surface layer is a surface layer of the leather material, or the leather material further includes a surface layer located at a side surface of the surface layer facing away from the substrate.

[0016] According to an embodiment of the present application, the surface layer has a thickness of 0.01mm to 0.04mm; and / or, the surface layer includes a cross-linking product of a second polymer, the second polymer including one or more of a fluorocarbon resin material, a fluorine ether siloxane, a polyurethane material.

[0017] According to an embodiment of the present application, the substrate includes a foaming layer.

[0018] According to an embodiment of the present application, the foaming layer has a thickness of 0.06mm to 0.1mm; and / or, the foaming layer includes a cross-linking product of a third polymer, the third polymer including one or more of a fluorine olefin copolymer, polyvinyl chloride, polyurethane, silicone resin.

[0019] According to an embodiment of the present application, the substrate further includes a base cloth layer located at a side of the foaming layer facing away from the surface layer, and a bonding layer located between the base cloth layer and the foaming layer.

[0020] According to an embodiment of the present application, the bonding layer includes a cross-linking product of a fourth polymer, the fourth polymer including one or more of a fluorocarbon resin, polyvinylidene fluoride, polyperfluoroethylene propylene, a fluorine olefin copolymer, polyvinyl chloride, polyurethane, silicone resin; and / or, the base cloth layer includes woven cloth and / or non-woven cloth.

[0021] In another aspect of the present application, a method for preparing the leather material is provided, comprising the following steps: forming the surface layer on at least one side surface of the substrate to obtain the leather material; wherein the step of forming the surface layer on at least one side surface of the substrate comprises the following steps: coating the first slurry containing the first polymer on at least one side surface of the substrate, and then curing to form the surface layer on at least one side surface of the substrate.

[0022] According to an embodiment of the present application, the first slurry comprises the following components by mass fraction: 60-70% of the emulsion containing the fluoropolymer, 10-30% of the aqueous polyurethane, 5-10% of the pigment, 1-5% of the inorganic filler, 0.5-1.5% of the zinc oxide, and 15-30% of the water; and / or, the curing is performed in air; and / or, the curing comprises the following steps: after coating the first slurry containing the first polymer on at least one side surface of the substrate, drying at a first temperature and then at a second temperature to form the surface layer on at least one side surface of the substrate to obtain the leather material; wherein the second temperature is higher than the first temperature.

[0023] According to an embodiment of the present application, the first temperature is 50-70°C; and / or, the drying time at the first temperature is 10-20 min; and / or, the second temperature is 70-90°C; and / or, the drying time at the second temperature is 50-70 min.

[0024] According to an embodiment of the present application, the substrate comprises a base cloth layer, and the surface layer has a texture on the side surface away from the substrate; the step of forming the surface layer on at least one side surface of the substrate comprises the following steps S101-S103: S101, providing a release paper having a leather grain structure; S102, forming the surface layer on the side surface of the release paper having the leather grain structure; wherein the surface layer has the texture on the side surface facing the release paper, which is matched with the leather grain structure of the release paper; S103, adhering the base cloth layer to the side surface of the surface layer away from the release paper, and then peeling off the release paper to obtain the leather material; or, the step of forming the surface layer on at least one side surface of the substrate comprises the following steps S201-S202: S201, forming the surface layer on the base cloth layer; S202, forming the texture on the side surface of the surface layer away from the base cloth layer by embossing to obtain the leather material.

[0025] According to an embodiment of the present application, the substrate further comprises an adhesive layer, and the process of bonding the surface layer to the base cloth layer on the side of the surface layer away from the release paper in step S103 comprises: forming the adhesive layer on the side of the surface layer away from the release paper; and bonding the base cloth layer to the side of the adhesive layer away from the surface layer. In step S202, the process of forming the surface layer on the base cloth layer comprises: forming the adhesive layer on the base cloth layer, and forming the surface layer on the side of the adhesive layer away from the base cloth layer. The substrate further comprises a foaming layer, and the process of forming the adhesive layer on the side of the surface layer away from the release paper in step S103 comprises: forming the foaming layer on the side of the surface layer away from the release paper, and then forming the adhesive layer on the side of the foaming layer away from the surface layer. In step S202, the process of forming the surface layer on the side of the adhesive layer away from the base cloth layer comprises: forming the foaming layer on the side of the adhesive layer away from the base cloth layer, and then forming the surface layer on the side of the foaming layer away from the base cloth layer.

[0026] According to an embodiment of the present application, the leather material further comprises a surface layer, and after the release paper is peeled off in step S104, the surface layer is formed on the side of the surface layer away from the base cloth layer to obtain the leather material. In step S203, after the texture is imprinted on the side of the surface layer away from the base cloth layer, the surface layer is formed on the side of the surface layer away from the base cloth layer to obtain the leather material.

[0027] According to another aspect of the present application, a terminal product is provided, which comprises the leather material described above.

[0028] In the present application, the surface layer of the leather material is made of a specific organic fluorine material (first polymer). The excellent stain resistance, cleanability and weather resistance of the organic fluorine material are utilized to achieve excellent stain resistance, easy cleanability and long service life of the leather material (organic fluorine leather), meet the increasingly diversified needs, and are especially suitable for light-colored stain-resistant leather scenarios (i.e., the leather material of the present application can be light-colored leather). At the same time, the surface layer formed of the organic fluorine material is firmly attached to the substrate, so that the leather material has good structural stability and other properties, and has high bonding strength (peeling strength) between the film layers (such as between the surface layer and the substrate), which meets the peeling force requirement of synthetic leather.

[0029] In addition, compared with conventional synthetic leather such as organic silicon synthetic leather, the surface layer of the leather material of the present application also has good processability, for example, a surface layer can be formed on the surface of the surface layer to further adjust the surface properties and other properties of the leather material, and the surface layer and the surface layer have good adhesion, which can avoid the problems of poor adhesion between the surface layer and the surface layer of conventional synthetic leather and other film layers, and the difficulty in balancing adhesion and wear resistance and stain resistance.

[0030] Therefore, the present application provides a new type of leather material, which is an organic fluorine leather material (organic fluorine composite material), has comfortable leather touch and texture, and also has good stain resistance, weather resistance, stain resistance, structural stability, and good processability and other properties, which is beneficial to practical industrial application. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the arrangement of fluorine elements in the organic fluorine material of an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the structure of the leather material of an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of the structure of the leather material of another embodiment of the present application;

[0034] Figure 4 is a schematic diagram of the structure of the leather material of another embodiment of the present application;

[0035] Figure 5 is a schematic diagram of the structure of the leather material of another embodiment of the present application.

[0036] Explanation of reference signs: 1: surface layer; 2: surface layer; 3: foaming layer; 4: adhesive layer; 5: base cloth layer. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to better understand the scheme of the present application, the present application will be further described in detail below. The following specific embodiments are only used to describe the principles and characteristics of the present application, and the examples are only used to explain the present application, and do not limit the scope of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0038] The embodiment of the present application provides a kind of leather material, as shown in Figure 2 to Figure 5, the leather material includes substrate, and surface layer 1 present in the surface of at least one side of substrate, surface layer 1 includes the crosslinked product of first polymer, and first polymer includes fluorine-containing polymer, and fluorine-containing polymer includes one or more of first fluorine-containing copolymer, polyvinylidene fluoride (PVDF), polyperfluoroethylene-propylene (FEP), second fluorine-containing copolymer;First fluorine-containing copolymer is the copolymer of trifluorochloroethylene (CTFE) and vinyl ether (VE) copolymerization;Second fluorine-containing copolymer (fluoroolefin copolymer) is the copolymer of at least two monomers of tetrafluoroethylene (PTFE), trifluorochloroethylene (CTFE), vinylidene fluoride (VDF) copolymerization.

[0039] In the embodiment of the present application, the above-mentioned organic fluorine material (fluorine-containing polymer) has good film-forming property and adhesion, which can be used as a film-forming material (film-forming agent) and an adhesive material to form the surface layer 1, and at the same time, improve the adhesion (bonding strength) between the surface layer 1 and the film layer of the substrate, etc. At the same time, the above-mentioned organic fluorine material has good stain resistance, cleanability and weather resistance, etc. By using the above-mentioned organic fluorine material to form the surface layer 1 of the leather material, the excellent stain resistance, easy cleanability and long service life of the leather material (organic fluorine leather) can be realized, at the same time, the firm adhesion of the surface layer 1 formed by the organic fluorine material on the substrate is realized, so that the leather material has good structural stability, etc. The bonding strength between each film layer (such as between the surface layer 1 and the substrate) is high, which meets the peeling force requirement of synthetic leather (leather material).

[0040] According to the research and analysis of the inventors, the above-mentioned organic fluorine material (or fluorine resin) has the characteristics of high C-F bond energy, short bond length and strong inertness, and fluorine (F) is distributed in a helical symmetry around the C-C main chain, which protects the main chain from being destroyed. Therefore, the above-mentioned organic fluorine material and the film layer such as surface layer 1 formed by it have the advantages of high stability, good stain resistance, easy cleaning, etc. The excellent stain resistance of light-colored synthetic leather can be realized, at the same time, the organic fluorine material and the film layer such as surface layer 1 formed by it have good weather resistance and chemical resistance, which can meet the requirements of longer service life and high frequency of wiping of the leather material.

[0041] Specifically, Table 1 shows the bond energy of common main chain chemical bonds, from which it can be seen that the C-F bond of the organic fluorine material in the embodiment of the present application is short and has high bond energy (the bond energy of the C-F bond can be as high as about 500 Kj / mol (about 497 Kj / mol in Table 1), close to the energy of a 220 nm photon (the photo-degradation wavelength is about 220 nm), and the proportion of light with a wavelength of about 220 nm in sunlight is very low), so the above-mentioned organic fluorine material and the surface layer 1 formed therefrom have good weather resistance, so that the leather material has good weather resistance and can improve the service life of the leather material.

[0042] Meanwhile, according to the research and analysis of the inventor, in the above-mentioned organic fluorine material, the adjacent F in the molecular chain repels each other, and the F is distributed in a spiral line in the carbon chain, thereby protecting the stability of the C-C bond, so that the above-mentioned organic fluorine material and the surface layer 1 formed therefrom have high chemical resistance, further ensuring the weather resistance and service life of the leather material, etc.

[0043] For example, the second fluorine-containing copolymer formed by copolymerization of PTFE and other monomers, Fig. 1 exemplarily shows a schematic diagram of the arrangement of the fluorine element in PTFE around the C-C main chain in a helical symmetric distribution, it can be seen that the adjacent F in the molecular chain repels each other, and the F is distributed in a spiral line in the carbon chain, thereby protecting the stability of the C-C bond, so that the organic fluorine material and the surface layer 1 formed therefrom have high chemical resistance, further ensuring the weather resistance and service life of the leather material, etc.

[0044] Table 1 Common main chain chemical bonds and their bond energies and photo-degradation wavelengths

[0045] According to the further research of the inventor, when the first polymer comprises a first fluorine-containing copolymer, the film hardness and other properties of the surface layer 1 can be further improved, thereby further optimizing the performance of the leather material.

[0046] Specifically, the first fluorine-containing copolymer (fluorocarbon resin (FEVE)) is a copolymer formed by CTFE monomers and VE monomers, which specifically can include an alternating copolymer formed by copolymerization of CTFE and VE.

[0047] In the embodiments of the present application, the first polymer is used as the main film-forming agent (organic fluorine film-forming agent) of the surface layer 1, and the crosslinked product of the first polymer is a crosslinked product formed by the first polymer in the presence of the first crosslinking agent, i.e., the crosslinked product is formed by crosslinking the first polymer under the action of the first crosslinking agent.

[0048] The first crosslinking agent can include a main crosslinking agent, and the main crosslinking agent includes one or more of oxygen, hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), and isophorone diisocyanate (IPDI), which facilitates the crosslinking of the first polymer to form the crosslinked product of the first polymer, and improves the weather resistance, stain resistance, and wear resistance of the leather material.

[0049] In addition, the first crosslinking agent can also include a crosslinking aid, and the crosslinking aid can include zinc oxide. When the first crosslinking agent includes the crosslinking aid, it facilitates the crosslinking reaction efficiency of the first polymer and improves the film-forming efficiency of the surface layer 1.

[0050] In addition, the first polymer described above can also include polyurethane, specifically water-based polyurethane. The polyurethane is used as a film-forming agent, and when the first polymer includes polyurethane, it facilitates the toughness and other properties of the surface layer 1.

[0051] In addition, in some embodiments, the first polymer described above can also include an acrylic resin and / or an epoxy resin, i.e., the first polymer can be doped with an acrylic resin and / or an epoxy resin, which can further improve the film-forming hardness and wear resistance and other properties of the surface layer 1, thereby further improving the hardness and wear resistance and other properties of the leather material.

[0052] In addition, in some embodiments, at least part of the first polymer described above contains an acrylic group and / or an epoxy group, and these groups can be grafted onto the side chain of the first polymer (i.e., at least part of the side chain of the first polymer is grafted with an acrylic group and / or an epoxy group). By grafting an acrylic and / or epoxy segment on the first polymer, it facilitates further improving the wear resistance and other properties of the formed surface layer 1.

[0053] In some specific embodiments, the second fluorine-containing copolymer described above can be grafted with an acrylic group or an epoxy group, which facilitates further improving the weather resistance, stain resistance, and wear resistance and other properties of the leather material.

[0054] Specifically, in the first polymer, the total mass content of the fluorine-containing polymer (such as the first fluorine-containing copolymer, PVDF, FEP, the second fluorine-containing copolymer, etc.) is greater than the total mass content of the non-fluorine-containing polymer (such as polyurethane, acrylic resin, epoxy resin, etc.), and the ratio of the total mass of the non-fluorine-containing polymer (the sum of the masses of all non-fluorine-containing polymers) to the total mass of the fluorine-containing polymer (the sum of the masses of all fluorine-containing polymers) can be less than 50%, for example, 0, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or a range consisting of any two of them.

[0055] In addition, the surface layer 1 can or can not contain a first auxiliary agent, which can include one or more of a first pigment, a first filler, the above cross-linking auxiliary agent, and a first leveling agent.

[0056] The first pigment is used to give the surface layer 1 a specific color effect, and can specifically include one or more of carbon black, titanium white, azo dyes, etc.

[0057] The first filler can include inorganic fillers, and can specifically include one or more of talc, barium sulfate, and silicon dioxide (SiO2).

[0058] Specifically, the first filler can include one or more of a first hardness improver, a first toughness improver, and a first wear-resistant auxiliary agent, the first hardness improver can improve the hardness of the surface layer 1, thereby improving the hardness and other properties of the leather material, and can include, for example, carbon black and / or barium sulfate; the first toughness improver is used to improve the toughness of the surface layer 1, thereby further improving the surface toughness and other properties of the leather material, and can include, for example, SiO2 and / or barium sulfate; and the first wear-resistant auxiliary agent is used to improve the wear resistance of the surface layer 1, thereby further improving the wear resistance of the leather material, and can include, for example, carbon black and / or titanium white.

[0059] When the surface layer 1 contains carbon black, the carbon black serves as a first pigment to give the surface layer 1 a certain color effect, and also serves as a first hardness improver and a first wear-resistant auxiliary agent to improve the hardness and wear resistance and other properties of the surface layer 1.

[0060] When the surface layer 1 contains titanium white, the titanium white serves as a first pigment to give the surface layer 1 a certain color effect, and also serves as a first wear-resistant auxiliary agent to improve the wear resistance and other properties of the surface layer 1.

[0061] When the surface layer 1 contains barium sulfate, the barium sulfate serves as a first hardness improver and a first toughness improver to improve the hardness and toughness and other properties of the surface layer 1.

[0062] In the embodiments of the present application, the silicon dioxide can specifically include nano-silicon dioxide, i.e., its particle size is in the nanometer range.

[0063] In addition, the first leveling agent is used to improve the flowability of the first slurry used to form the surface layer 1, so that it is more level during the process of coating to form the surface layer 1, so that the formed surface layer 1 is more level, has better uniformity and other properties, and the first leveling agent can specifically include a polysiloxane leveling agent.

[0064] Specifically, the surface layer 1 can be processed and prepared by a solvent-containing coating method or a solvent-free coating method, and is preferably formed by a solvent-containing coating method, that is, the surface layer 1 can be formed by cross-linking and curing the first slurry containing the first polymer and the first solvent and the like, that is, the first slurry can be coated on at least one side surface of the substrate, and then after curing (or cross-linking and curing), the surface layer 1 is formed on at least one side surface of the substrate to obtain the leather material. The preparation process of the leather material is specifically described below, and will not be described in detail here.

[0065] In addition, the thickness of the surface layer 1 can be 0.03mm-0.06mm, for example, 0.03mm, 0.04mm, 0.05mm, 0.06mm or a range formed by any two of them.

[0066] In addition, the side surface of the surface layer 1 away from the substrate can have a texture, that is, the surface layer 1 is an organic fluorine textured layer, which can give the leather material a textured effect. The texture can be a conventional leather texture (skin texture structure) in the art, such as cowhide texture, crocodile texture, etc., so that the surface of the leather material has a skin texture and a skin touch.

[0067] Specifically, the texture of the side surface of the surface layer 1 away from the substrate layer can be realized by texture paper coating film forming, or embossing (mold pressing technology, heat molding, etc.) to form a texture on the surface of the surface layer 1. For example, the process of forming a texture by texture paper coating film forming includes: coating the first slurry used to form the surface layer 1 on the surface of the texture paper (release paper with a texture that matches the texture of the surface layer 1), and then curing the first slurry into the surface layer 1, which will form a texture that matches the texture of the texture paper.

[0068] In some embodiments, the surface layer 1 can be the surface layer of the leather material, that is, the side surface of the surface layer 1 away from the substrate has no other coating layer. By using the above-mentioned surface layer 1 as the surface layer of the leather material, the good stain resistance, easy cleaning and long service life of the leather material can be improved.

[0069] In some embodiments, the leather material can further include a surface layer 2 located at the surface of the surface layer 1 away from the substrate, by arranging the surface layer 2 on the surface of the surface layer 1, the surface properties of the leather material can be further adjusted while improving the stain resistance, cleanability and weather resistance of the leather material, for example, the wear resistance and scratch resistance of the leather material can be further improved, and the desired leather touch can also be achieved according to the requirements, realizing a more diverse touch effect of the leather material. In addition, the surface layer 1 formed by the above-mentioned organic fluorine material has a high bonding strength with the substrate, and has good adhesion with the surface layer 2, which can improve the structural stability and other properties of the leather material.

[0070] In comparison, if the thickness of the surface layer 2 is too small, the adjustment effect on the surface properties of the leather material is limited, and if the thickness of the surface layer 2 is too large, it will affect the texture effect of the surface layer 1 of the leather material, therefore, considering these factors comprehensively, the thickness of the surface layer 2 is preferably 0.01mm-0.04mm, for example, 0.01mm, 0.02mm, 0.03mm, 0.04mm or a range formed by any two of them.

[0071] In the embodiments of the present application, as shown in FIGS. 2-5, the substrate can include a base cloth layer 5, which can include woven cloth and / or non-woven cloth.

[0072] In addition, as shown in FIGS. 3-5, the substrate can further include an adhesive layer 4 located between the base cloth layer 5 and the surface layer 1, which can further improve the bonding strength between the surface layer 1 and the film layer such as the substrate.

[0073] In some embodiments, as shown in FIGS. 3-5, the base cloth layer 5, the adhesive layer 4 and the surface layer 1 are sequentially stacked and directly contact, i.e. the base cloth layer 5 directly contacts the adhesive layer 4 without other film layers or structures between them, and the adhesive layer 4 directly contacts the surface layer 1 without other film layers or structures between them, at this time, the substrate is composed of the base cloth layer 5 and the adhesive layer 4, the adhesive layer 4 is arranged on the side surface of the base cloth layer 5 facing the surface layer 1, and the surface layer 1 is adhered to the base cloth layer 5 through the adhesive layer 4, which can improve the bonding strength between the surface layer 1 and the base cloth layer 5.

[0074] In addition, as shown in FIGS. 4 and 5, the above-mentioned substrate can further include a foaming layer 3 (or called hand feeling layer), and the base cloth layer 5, the foaming layer 3 and the surface layer 1 are stacked, by arranging the soft foaming layer 3, the leather material can be given a soft texture, so that the leather material has the properties of softness, light weight, good stain resistance and weather resistance, etc.

[0075] Specifically, the thickness of the foamed layer 3 can be 0.06mm-0.1mm, for example, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm or a range consisting of any two of them.

[0076] In some embodiments, as shown in FIGS. 4 and 5, the foamed layer 3 is located between the base cloth layer 5 and the surface layer 1 (the base cloth layer 5 is located on the side of the foamed layer 3 away from the surface layer 1), and specifically can be located between the adhesive layer 4 and the surface layer 1, and the foamed layer 3 is adhered between the adhesive layer 4 and the base cloth layer 5 (the adhesive layer 4 is located between the base cloth layer 5 and the foamed layer 3), that is, the leather material includes the base cloth layer 5, the adhesive layer 4, the foamed layer 3 and the surface layer 1 which are sequentially stacked.

[0077] In addition, as shown in FIGS. 4 and 5, the foamed layer 3 and the surface layer 1 can be directly in contact, that is, there is no other film layer or the like structure between them.

[0078] Specifically, the surface layer 2 can include a crosslinked product of a second polymer, and the second polymer can include one or more of a fluorocarbon resin material, a fluoroether siloxane, a polyurethane material.

[0079] In some embodiments, the surface layer 2 can include an organic fluorine surface layer 2, and the organic fluorine surface layer 2 includes a crosslinked product of a second polymer, and the second polymer includes a fluorine-containing polymer, and specifically can include a fluorocarbon resin material and / or a fluoroether siloxane.

[0080] In addition, the surface layer 2 can contain or not contain a second auxiliary agent, and the second auxiliary agent includes, for example, the above-mentioned first auxiliary agent, for example, the second auxiliary agent includes a pigment, and the pigment includes one or more of carbon black, titanium dioxide, azo dyes and the like, and when the surface layer 2 contains the second auxiliary agent, the second auxiliary agent in the surface layer 2 and the first auxiliary agent in the surface layer 1 can be the same or different.

[0081] Specifically, the adhesive layer 4 can include a crosslinked product of a fourth polymer, and the fourth polymer can include one or more of a fluorocarbon resin, polyvinylidene fluoride (PVDF), polyperfluoroethylene propylene (FEP), a fluorine-olefin copolymer, polyvinyl chloride (PVC), polyurethane (PU), a silicone resin, wherein the fluorocarbon resin specifically can include a first fluorine-containing copolymer, and the fluorine-olefin copolymer specifically can include a second fluorine-containing polymer.

[0082] In some embodiments, the adhesive layer 4 includes an organic fluorine adhesive layer 4, and the organic fluorine adhesive layer 4 includes a crosslinked product of a fourth polymer, and the fourth polymer includes one or more of a first fluorine-containing copolymer, PVDF, FEP, a second fluorine-containing polymer and the like fluorine-containing polymer.

[0083] Generally, the crosslinked product of the fourth polymer is a crosslinked product formed by the fourth polymer in the presence of a fourth crosslinking agent, i.e., the fourth polymer is crosslinked to form the crosslinked product under the action of the fourth crosslinking agent.

[0084] The fourth crosslinking agent can include one or more of oxygen, hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), isophorone diisocyanate (IPDI).

[0085] In addition, the adhesive layer 4 can contain or not contain a fourth auxiliary agent, which for example includes the first auxiliary agent described above, for example, the fourth auxiliary agent includes a pigment, which includes one or more of carbon black, titanium dioxide, azo dyes, etc., and when the fourth auxiliary agent is contained in the adhesive layer 4, the fourth auxiliary agent in the adhesive layer 4 and the first auxiliary agent in the surface layer 1 can be the same or different.

[0086] Specifically, the foamed layer 3 can include a crosslinked product of a third polymer, which can include one or more of a fluoroolefin copolymer, polyvinyl chloride (PVC), polyurethane (PU), silicone resin, and the fluoroolefin copolymer includes the second fluorine-containing copolymer.

[0087] In some embodiments, the foamed layer 3 includes an organic fluorine foamed layer 3, which includes a crosslinked product of a third polymer, and the third polymer includes the second fluorine-containing copolymer or the like fluorine-containing polymer.

[0088] Generally, the crosslinked product of the third polymer is a crosslinked product formed by the third polymer in the presence of a third crosslinking agent, i.e., the third polymer is crosslinked to form the crosslinked product under the action of the third crosslinking agent.

[0089] The third crosslinking agent can include one or more of oxygen, hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), isophorone diisocyanate (IPDI).

[0090] In addition, the foamed layer 3 can contain or not contain a third auxiliary agent, which for example includes the first auxiliary agent described above, for example, the third auxiliary agent includes a pigment, which includes one or more of carbon black, titanium dioxide, azo dyes, etc., and when the third auxiliary agent is contained in the foamed layer 3, the third auxiliary agent in the foamed layer 3 and the first auxiliary agent in the surface layer 1 can be the same or different.

[0091] In the embodiments of the present application, the leather material can be cut to form a cut surface (which is substantially parallel to the thickness direction of the leather material), and then the cut surface is observed by a microscope, and according to the differences in the color, shape and other characteristics of each film layer, the film layer structure of the leather material and the thickness of each film layer and other parameters are obtained.

[0092] The present application also provides a method for preparing the leather material, comprising the following steps: forming a surface layer 1 on at least one side of the surface of the substrate to obtain the leather material; wherein the process of forming the surface layer 1 on at least one side of the surface of the substrate comprises: coating a first slurry containing the first polymer on at least one side of the surface of the substrate, and then curing to form the surface layer 1 on at least one side of the surface of the substrate.

[0093] Specifically, the first slurry can further contain one or more of a first crosslinking agent, a first initiator, a first auxiliary agent, a first emulsifier, a first leveling agent, and the like, or can not contain these components. The first initiator is used to initiate the polymerization reaction (or crosslinking reaction, curing reaction) of the first polymer and the like in the first slurry, so that the first polymer and the like are crosslinked to form a crosslinked product of the first polymer, thereby obtaining the surface layer 1.

[0094] Specifically, the first slurry includes a solvent for dispersing the first polymer and the like to form the first slurry. The first solvent can include water, and specifically can include deionized water.

[0095] In some embodiments, the first slurry includes an emulsion containing a fluorine-containing polymer, an aqueous polyurethane, a first pigment, a first filler, a crosslinking auxiliary agent, and water.

[0096] Further, the first slurry can include the following mass fractions of components: 60% to 70% of the emulsion containing the fluorine-containing polymer, 10% to 30% of the aqueous polyurethane, 5% to 10% of the pigment, 1% to 5% of the inorganic filler, 0.5% to 1.5% of zinc oxide, and the balance of water. Specifically, the mass fraction of water can be 15% to 30%.

[0097] For example, in the first slurry, the mass fraction of the emulsion containing the fluorine-containing polymer (i.e., the mass ratio of the emulsion containing the fluorine-containing polymer to the first slurry) can be 60%, 62%, 65%, 68%, 70%, or a range consisting of any two of the foregoing.

[0098] For example, in the first slurry, the mass fraction of the aqueous polyurethane (i.e., the mass ratio of the aqueous polyurethane to the first slurry) can be, for example, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, or a range consisting of any two of the foregoing.

[0099] Specifically, the emulsion containing the fluorine-containing polymer contains water, and the fluorine-containing polymer is dispersed in the water to form an emulsion. Specifically, the emulsion containing the fluorine-containing polymer can include an aqueous fluorocarbon resin emulsion containing a first fluorine-containing copolymer.

[0100] Further, the above-mentioned cross-linking and curing process can be performed in an atmosphere containing oxygen, for example, in air (i.e., the atmosphere containing oxygen is air), so that the first polymer is cross-linked to form a cross-linked product of the first polymer by oxygen in the air as the first cross-linking agent, thereby forming the surface layer 1 on the surface of the substrate.

[0101] In some embodiments, the above-mentioned curing process can include: after the first slurry containing the first polymer is applied to the surface of at least one side of the substrate, sequentially drying at a first temperature and a second temperature to form the surface layer 1 on the surface of at least one side of the substrate to produce the leather material; wherein the second temperature is higher than the first temperature. In this way, preliminary drying (low-temperature curing) at a low temperature (first temperature) is performed first to facilitate ensuring the uniformity of the formed surface layer 1, and then drying (high-temperature curing) at a high temperature (second temperature) is performed to facilitate complete curing of the first polymer and other components in the first slurry to form the surface layer 1.

[0102] Specifically, the first temperature can be 50-70°C, for example, 50°C, 53°C, 55°C, 58°C, 60°C, 63°C, 65°C, 68°C, 70°C, or a range consisting of any two of them.

[0103] Specifically, the second temperature can be 70-90°C, for example, 70°C, 73°C, 75°C, 78°C, 80°C, 83°C, 85°C, 88°C, 90°C, or a range consisting of any two of them.

[0104] Specifically, the difference between the first temperature and the second temperature can be 10-30°C, for example, 10°C, 13°C, 15°C, 18°C, 20°C, 23°C, 25°C, 28°C, 30°C, or a range consisting of any two of them.

[0105] Further, the time of drying at the second temperature can be greater than the time of drying at the first temperature.

[0106] Specifically, the time of drying at the first temperature can be 10-20 min, for example, 10 min, 13 min, 15 min, 18 min, 20 min, or a range consisting of any two of them.

[0107] Specifically, the time of drying at the second temperature is 50-70 min, for example, 50 min, 53 min, 55 min, 58 min, 60 min, 63 min, 65 min, 68 min, 70 min, or a range consisting of any two of them.

[0108] Specifically, as shown in FIGS. 2-5, the substrate includes a base cloth layer 5, and the surface layer 1 has a texture on the side surface away from the substrate.

[0109] In some embodiments, the process of forming the surface layer 1 on at least one side surface of the substrate comprises steps S101-S103:

[0110] S101, providing a release paper having a skin texture structure;

[0111] S102, forming the surface layer 1 on the side surface of the release paper having the skin texture structure; wherein the side surface of the surface layer 1 facing the release paper is formed with a texture matching the skin texture structure of the release paper;

[0112] S103, adhering the base cloth layer 5 to the side surface of the surface layer 1 away from the release paper, and peeling off the release paper to obtain the leather material;

[0113] In other embodiments, the process of forming the surface layer 1 on at least one side surface of the substrate comprises steps S201-S202:

[0114] S201, forming the surface layer 1 on the base cloth layer 5;

[0115] S202, forming the texture on the side surface of the surface layer 1 away from the base cloth layer 5 to obtain the leather material.

[0116] In addition, as shown in FIGS. 2-5, the substrate can further comprise an adhesive layer 4. In step S103, the process of adhering the base cloth layer 5 to the side surface of the surface layer 1 away from the release paper comprises: forming the adhesive layer 4 on the side surface of the surface layer 1 away from the release paper; adhering the base cloth layer 5 to the side surface of the adhesive layer 4 away from the surface layer 1. In step S202, the process of forming the surface layer 1 on the base cloth layer 5 comprises: forming the adhesive layer 4 on the base cloth layer 5, and forming the surface layer 1 on the side surface of the adhesive layer 4 away from the base cloth layer 5.

[0117] In some embodiments, the adhesive layer 4 and the surface layer 1 are in direct contact without other film layers or the like between them (as shown in FIG. 3). In this case, in step S103, the adhesive layer 4 is formed directly on the surface layer 1. In step S202, the surface layer 1 is formed directly on the adhesive layer 4.

[0118] In addition, as shown in FIGS. 4 and 5, the substrate can further comprise a foaming layer 3. In this case, in step S103, the process of forming the adhesive layer 4 on the side surface of the surface layer 1 away from the release paper can comprise: forming the foaming layer 3 on the side surface of the surface layer 1 away from the release paper, and then forming the adhesive layer 4 on the side surface of the foaming layer 3 away from the surface layer 1. In step S202, the process of forming the surface layer 1 on the side surface of the adhesive layer 4 away from the base cloth layer 5 can comprise: forming the foaming layer 3 on the side surface of the adhesive layer 4 away from the base cloth layer 5, and then forming the surface layer 1 on the side surface of the foaming layer 3 away from the base cloth layer 5.

[0119] In the implementation, the first slurry can be coated on a release paper (step S102), the adhesive layer 4 (step S202), or the foaming layer 3 (step S202) to form the substrate of the surface layer 1, and then solidified to form the surface layer 1.

[0120] In addition, as shown in FIG. 5, the leather material can further include a finishing layer 2. In this case, in step S103, after the release paper is peeled off, the finishing layer 2 is formed on the side surface of the surface layer 1 away from the base cloth layer 5 to obtain the leather material; and in step S202, after the texture is imprinted on the side surface of the surface layer 1 away from the base cloth layer 5, the finishing layer 2 is formed on the side surface of the surface layer 1 away from the base cloth layer 5 to obtain the leather material.

[0121] In the embodiments of the present application, the film layers such as the base cloth layer 5, the adhesive layer 4, the foaming layer 3, and the finishing layer 2 can be formed by conventional methods in the art, and the process of imprinting the texture can also be a conventional process in the art, which is not particularly limited.

[0122] For example, the finishing layer 2 can be solidified from a second slurry containing a second polymer and a second solvent for dispersing the second polymer and other components, i.e., the second slurry can be coated on the surface layer 1 (the side surface of the surface layer 1 away from the base material), and then solidified to form the finishing layer 2. The second slurry can further contain one or more of a second emulsifier, a second crosslinking agent, a second auxiliary agent (such as a pigment), and the like, or can not contain these components.

[0123] For example, the foaming layer 3 can be solidified from a third slurry containing a third polymer and a third solvent for dispersing the third polymer and other components, and the third slurry can further contain one or more of a third emulsifier, a third crosslinking agent, a third auxiliary agent (such as a pigment), an initiator, and the like, or can not contain these components.

[0124] In the embodiments of the present application, the foaming layer 3 has a cell structure, which can be realized by physical action or by a foaming aid, i.e., in the process of forming the foaming layer 3, the cell structure can be formed by physical action, or the foaming aid can be added to the material for forming the foaming layer 3 to form the cell structure in the foaming layer 3 based on the foaming aid. These foaming processes are conventional operations in the art, which are not particularly limited.

[0125] For example, the adhesive layer 4 can be solidified from a fourth slurry containing a fourth polymer and a fourth solvent for dispersing the fourth polymer and other components, and the fourth slurry can further contain one or more of a fourth crosslinking agent, a fourth auxiliary agent (such as a pigment), and the like, or can not contain these components.

[0126] Exemplarily, in the process of preparing the leather material through steps S101-S104, after the first slurry for forming the surface layer 1 is coated on the side surface of the release paper having the leather grain structure, the first slurry is solidified or semi-solidified, then the fourth slurry for forming the adhesive layer 4 is coated, the base cloth layer 5 is attached, and then solidified and formed to obtain the leather material; or, after the first slurry for forming the surface layer 1 is coated on the side surface of the release paper having the leather grain structure, the first slurry is solidified or semi-solidified, then the third slurry for forming the foaming layer 3 is coated, the third slurry is solidified or semi-solidified, then the fourth slurry for forming the adhesive layer 4 is coated, the base cloth layer 5 is attached, and then solidified and formed to obtain the leather material. After solidified and formed, the second slurry for forming the surface layer 2 can be coated on the side surface of the surface layer 1 away from the base material, and the second slurry is solidified to obtain the leather material.

[0127] Exemplarily, in the process of preparing the leather material through steps S201-S203, the fourth slurry for forming the adhesive layer 4 is coated on the base cloth layer 5, the fourth slurry is solidified or semi-solidified, then the first slurry for forming the surface layer 1 is coated, and then solidified and formed to obtain the leather material; or, the first slurry is solidified or semi-solidified, then the second slurry for forming the surface layer 2 is coated, and then solidified and formed to obtain the leather material.

[0128] Exemplarily, in the process of preparing the leather material through steps S201-S203, the fourth slurry for forming the adhesive layer 4 is coated on the base cloth layer 5, the fourth slurry is solidified or semi-solidified, then the third slurry for forming the foaming layer 3 is coated, the third slurry is solidified or semi-solidified, then the first slurry for forming the surface layer 1 is coated, and then solidified and formed to obtain the leather material; or, the first slurry is solidified or semi-solidified, then the second slurry for forming the surface layer 2 is coated, and then solidified and formed to obtain the leather material.

[0129] The embodiment of the present application also provides a terminal product comprising the leather material, which has the advantages corresponding to the leather material, and will not be described again.

[0130] In the embodiment of the present application, the terminal product can be an appearance structure, or other terminal device containing the appearance structure, such as a vehicle (such as a yacht, a car, etc.), a household device (such as furniture, a smart home device), a wearable device, an electronic device, etc.

[0131] The present application will be further described through specific embodiments. In the following embodiments, the first fluorine-containing copolymer is an alternating copolymer copolymerized from chlorotrifluoroethylene (CTFE) and vinyl ether (VE); and the base cloth layer 5 is a woven cloth.

[0132] Embodiment 1

[0133] The leather material of the present embodiment 1 is shown in Fig. 2, which is prepared by laminating the base cloth layer 5 and the surface layer 1 (texture layer), and the preparation process is as follows:

[0134] (1) 65% of the aqueous fluorocarbon resin (first fluorine-containing polymer) emulsion, 20% of the aqueous polyurethane, 7.5% of the titanium white powder, 3% of the talc powder, 1% of the zinc oxide, and the balance of deionized water are mixed to prepare a first slurry;

[0135] (2) The first slurry is uniformly coated on one side surface of the base cloth layer 5, and the thickness of the wet film (coating thickness) is about 0.05 mm, and then dried at 60°C for 15 min, and then dried at 80°C for 60 min, so as to form the surface layer 1 with a thickness of about 0.04 mm on one side surface of the base cloth layer 5;

[0136] (3) The texture is imprinted on the side of the surface layer 1 away from the base cloth layer 5 by a molding process to obtain the leather material.

[0137] The leather material prepared in the present embodiment 1 is tested for the following properties:

[0138] 1. Stain resistance test

[0139] The test sample is tested according to the standard GB / T 250-2008, and the test process is as follows: Zebra marker is used to draw three lines (pollutants) with a length of 5 cm on the surface of the leather material; the pollutants are allowed to remain on the surface of the leather material for 30 min under standard sample conditions; then a piece of wiping cloth with a length of 150 mm and a width of 150 mm is taken, and the wiping cloth is immersed in deionized water, and then the wiping cloth is twisted gently after being wetted, and then the pollutants on the surface of the leather material are wiped off with the wiping cloth until there is no color transfer on the surface of the wiping cloth, and then the leather material is placed in a standard climate for 24 h, and then the degree of gray scale on the surface of the leather material is evaluated according to the GB / T 250-2008 / ISO 105-A02; 1993 color change gray card.

[0140] The results show that the degree of gray scale of the leather material of the present embodiment 1 is greater than 3 levels according to the above test process, which shows good stain resistance, and the stain resistance is better than that of conventional synthetic leather such as PVC, PU, and silicone synthetic leather.

[0141] 2. Abrasion resistance test

[0142] The Taber abrasion tester (TABER5135 / 5155 abrasion tester, single arm load 500g, total 1000g) is used to test the abrasion resistance of the leather material, and the CS-17 type grinding wheel is used to rub the surface of the leather material at a speed of 60 revolutions / min, and the total rubbing time is 500 times; and then the abrasion resistance grade is evaluated according to the following standard:

[0143] 1st: no scratch or damage

[0144] 2nd: no defect visible to the naked eye, or only visible under magnifying glass

[0145] 3rd: slight discoloration due to abrasion

[0146] 4th: partial obvious discoloration visible

[0147] The results show that the abrasion resistance grade of the leather material of Example 1 is 1st according to the above test process, which shows good abrasion resistance, and the abrasion resistance is better than that of PVC, PU, silicone synthetic leather and other conventional synthetic leather.

[0148] 3. Weather resistance test

[0149] (1) Before testing, check the appearance of the leather material, take the leather material sample without discoloration, bubbles, cracks, peeling and other abnormal phenomena, and wipe the surface of the leather material sample with a clean cloth;

[0150] (2) Put the leather material sample into a normal temperature state incubator, adjust the temperature of the incubator to 70°C, and test for 144h (i.e. put the leather material sample in the incubator at a temperature of 70°C for 144h), and observe whether there are abnormal phenomena at 72h (i.e. the intermediate check point is 72h), if there are no abnormal phenomena, continue to place until 144h;

[0151] (3) Then, adjust the temperature to 25°C, and keep the temperature at 25°C for 2 hours;

[0152] (4) Take out the leather material sample from the incubator, check the appearance, and evaluate the gray scale of the surface of the leather material according to the "GB / T 250-2008 / ISO 105-A02; 1993" discoloration gray card.

[0153] The results show that after the above weather resistance test (steps (1) to (4)) of the leather material of Example 1, the surface has no abnormality, no serious deformation, discoloration, bubble and other appearance defects, and the gray scale is greater than 4th.

[0154] In addition, on the basis of Example 1, an adhesive layer 4 is formed between the surface layer 1 and the base cloth layer 5 (the structure of the leather material is shown in FIG. 3, FIG. 4 or FIG. 5), which can improve the stain resistance, abrasion resistance and weather resistance of the leather material, and further improve the bonding strength between the surface layer 1 and the base cloth layer 5.

[0155] In addition, based on the embodiment 1, the foaming layer 3 (the thickness of the foaming layer 3 is about 0.07 mm) is formed between the surface layer 1 and the base cloth layer 5, for example, the leather material comprises the base cloth layer 5, the adhesive layer 4, the foaming layer 3 and the surface layer 1 which are sequentially stacked (as shown in FIG. 4 or FIG. 5), which can improve the stain resistance, wear resistance and weather resistance of the leather material, and further improve the softness of the leather material.

[0156] In addition, based on the embodiment 1, the surface layer 2 (the thickness of the surface layer 2 is about 0.02 mm) is formed on the side of the surface layer 1 away from the base cloth layer 5, for example, the leather material comprises the base cloth layer 5, the adhesive layer 4, the foaming layer 3, the surface layer 1 and the surface layer 2 which are sequentially stacked (as shown in FIG. 5), which can improve the stain resistance, wear resistance and weather resistance of the leather material, maintain the high bonding strength between the surface layer 1 and the surface layer 2, improve the structural stability and other properties of the leather material, and achieve a richer touch effect of the leather material.

[0157] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A leather material, characterized by, The leather material comprises a substrate and a surface layer present on at least one side surface of the substrate, the surface layer comprising a crosslinked product of a first polymer, the first polymer comprising a fluoropolymer, the fluoropolymer comprising one or more of a first fluorocopolymer, polyvinylidene fluoride, polyperfluoroethypropylene, a second fluorocopolymer; The first fluorocopolymer is a copolymer of chlorotrifluoroethylene and vinyl ether; The second fluorocopolymer is a copolymer of at least two monomers of tetrafluoroethylene, chlorotrifluoroethylene, and vinylidene fluoride.

2. The leather material according to claim 1, characterized in that, The first fluorocopolymer comprises an alternating copolymer of chlorotrifluoroethylene and vinyl ether.

3. The leather material according to claim 1 or 2, characterized in that, The crosslinked product of the first polymer is a crosslinked product of the first polymer in the presence of a first crosslinking agent, the first crosslinking agent comprising a main crosslinking agent and a crosslinking co-agent, the main crosslinking agent comprising one or more of oxygen, hexamethylene diisocyanate, toluene diisocyanate, isophorone diisocyanate, and the crosslinking co-agent comprising zinc oxide.

4. The leather material according to claim 1 or 2, wherein The first polymer further comprises an aqueous polyurethane; and / or, the first polymer further comprises an acrylic resin and / or an epoxy resin; and / or, at least part of the first polymer contains an acrylic group and / or an epoxy group.

5. The leather material according to claim 1 or 2, characterized in that, The surface layer contains a first additive, the first additive comprising one or more of a first pigment, a first filler, a crosslinking co-agent, and a first leveling agent; the first pigment comprising one or more of carbon black, titanium dioxide, and azo dyes; the first filler comprising one or more of talc, barium sulfate, and silicon dioxide; the crosslinking co-agent comprising zinc oxide; and the first leveling agent comprising a polysiloxane leveling agent.

6. The leather material according to claim 1 or 2, characterized in that, The surface layer has a thickness of 0.03 mm to 0.06 mm.

7. The leather material according to claim 1 or 2, characterized in that, The side surface of the surface layer away from the substrate has a texture.

8. The leather material according to claim 1 or 2, characterized in that, The surface layer is a surface layer of the leather material, or the leather material further comprises a surface layer located on the side surface of the surface layer away from the substrate.

9. The leather material according to claim 8, wherein The surface layer has a thickness of 0.01 mm to 0.04 mm. and / or, the surface layer comprises a crosslinked product of a second polymer, the second polymer comprising one or more of a fluorocarbon resin material, a fluorine-ether siloxane, and a polyurethane material.

10. The leather material according to claim 1, characterized in that, The substrate comprises a foamed layer.

11. The leather material according to claim 10, wherein The foamed layer has a thickness of 0.06 mm to 0.1 mm. and / or, the foamed layer comprises a crosslinked product of a third polymer, the third polymer comprising one or more of a fluorine-olefin copolymer, polyvinyl chloride, polyurethane, and a silicone resin.

12. Leather material according to claim 10 or 11, characterized in that The substrate further comprises a base cloth layer located on the side of the foamed layer away from the surface layer, and an adhesive layer located between the base cloth layer and the foamed layer.

13. The leather material according to claim 12, wherein The adhesive layer comprises a crosslinked product of a fourth polymer, the fourth polymer comprising one or more of a fluorocarbon resin, a polyvinylidene fluoride, a polyperfluoroethypropylene, a fluoroolefin copolymer, a polyvinyl chloride, a polyurethane, a silicone resin; And / or, the base fabric layer comprises a woven fabric and / or a non-woven fabric.

14. A method for the preparation of the leather material according to any one of claims 1 to 13, characterized in that, The method comprises the following steps: The surface layer is formed on at least one side surface of the substrate to obtain the leather material; wherein the process of forming the surface layer on at least one side surface of the substrate comprises the following steps: a first slurry containing the first polymer is coated on at least one side surface of the substrate, and then solidified to form the surface layer on at least one side surface of the substrate.

15. The method of claim 14, wherein: The first slurry comprises the following components by mass fraction: 60-70% of an emulsion containing the fluoropolymer, 10-30% of an aqueous polyurethane, 5-10% of a pigment, 1-5% of an inorganic filler, 0.5-1.5% of zinc oxide, and 15-30% of water; And / or, the solidification process is performed in air; And / or, the solidification process comprises the following steps: after the first slurry containing the first polymer is coated on at least one side surface of the substrate, the surface layer is formed on at least one side surface of the substrate by drying at a first temperature and then at a second temperature to obtain the leather material; wherein the second temperature is higher than the first temperature.

16. The method of claim 15, wherein: The first temperature is 50-70°C; And / or, the drying time at the first temperature is 10-20 min; And / or, the second temperature is 70-90°C; And / or, the drying time at the second temperature is 50-70 min.

17. A method of producing a leather material according to any one of claims 14-16, characterized in that, The substrate comprises a base fabric layer, and the surface layer has a texture on the side surface away from the substrate; The process of forming the surface layer on at least one side surface of the substrate comprises the following steps S101-S103: S101, providing a release paper having a leather grain structure; S102, forming the surface layer on the side surface of the release paper having the leather grain structure; wherein the surface layer has the texture formed on the side surface facing the release paper, which is matched with the leather grain structure of the release paper; S103, laminating the base fabric layer on the side surface of the surface layer away from the release paper, and peeling off the release paper to obtain the leather material; Alternatively, the process of forming the surface layer on at least one side surface of the substrate comprises the following steps S201-S202: S201, forming the surface layer on the base fabric layer; S202, forming the texture on the side surface of the surface layer away from the base fabric layer to obtain the leather material.

18. The method of claim 17, wherein: The substrate further comprises an adhesive layer, and the process of bonding the surface layer to the base cloth layer on the side of the surface layer away from the release paper in step S103 comprises: forming the adhesive layer on the side of the surface layer away from the release paper; and bonding the base cloth layer to the side of the adhesive layer away from the surface layer; and the process of forming the surface layer on the base cloth layer in step S202 comprises: forming the adhesive layer on the base cloth layer, and forming the surface layer on the side of the adhesive layer away from the base cloth layer. The substrate further comprises a foaming layer; and the process of forming the adhesive layer on the side of the surface layer away from the release paper in step S103 comprises: forming the foaming layer on the side of the surface layer away from the release paper, and then forming the adhesive layer on the side of the foaming layer away from the surface layer. The process of forming the surface layer on the side of the adhesive layer away from the base cloth layer in step S202 comprises: forming the foaming layer on the side of the adhesive layer away from the base cloth layer, and then forming the surface layer on the side of the foaming layer away from the base cloth layer.

19. The method of claim 17, wherein the leather material is prepared by, The leather material further comprises a surface layer; The process of forming the surface layer on the side of the surface layer away from the base cloth layer after peeling off the release paper in step S104 comprises: forming the surface layer on the side of the surface layer away from the base cloth layer. The process of forming the surface layer on the side of the surface layer away from the base cloth layer after forming the texture on the side of the surface layer away from the base cloth layer in step S203 comprises: forming the surface layer on the side of the surface layer away from the base cloth layer.

20. A terminal product, characterized in that The leather material according to any one of claims 1-11.

Images