A kind of antique high-property sports shoes with humidity sensing function sheepskin and its preparation method

Abstract

The application discloses a kind of antique high-property sports shoes with humidity sensing function with sheep leather and its preparation method, from bottom to top successively are base cloth layer, intermediate binding layer and sheep leather surface layer;The base cloth layer is with high-property modified non-woven fabric as base cloth substrate, inside weaving composite lithium titanate humidity sensing network;The sheep leather surface layer is porous polyurethane layer containing aqueous carbon nanotube;The intermediate binding layer is aqueous PU adhesive layer containing pore forming agent.When the relative humidity in shoes increases to 85%±5% critical value (comfortable humidity critical value when wearing sports shoes), the resistance change rate of lithium titanate sensing network is ≥90% (compared with dry state, dry state is defined as relative humidity≤40%), to ensure that humidity signal can be clearly captured and conducted;At the same time, the response time of lithium titanate sensing network is less than 10s, the recovery time is less than 15s, and there is no obvious lag, which is suitable for the humidity dynamic change scene when wearing sports shoes.

Description

Technical Field

[0001] This invention belongs to the field of synthetic leather technology, and specifically relates to an antique-style high-performance sheepskin leather for sports shoes with humidity sensing function and its preparation method. Background Technology

[0002] With the increasing demand for functional and intelligent athletic shoes, consumers are not only paying attention to the appearance and texture of shoe materials (such as the retro style of antique sheepskin leather), but also placing greater emphasis on wearing comfort and functional feedback. In-shoe humidity is a key factor affecting wearing comfort. After prolonged exercise, sweat can easily accumulate inside the shoe, leading to increased humidity. This can not only cause stuffiness but also potentially breed bacteria, produce odors, and even affect the safety of sports activities.

[0003] Existing sheepskin used in athletic shoes mainly focuses on appearance simulation and basic mechanical properties, lacking humidity sensing and intuitive feedback functions. The few shoe materials with sensing functions have the following defects: First, the composite of the sensing material and the base fabric is poor, which can easily lead to the breakage of the conductive network and affect the stability of the sensing. Second, the bonding strength of the intermediate bonding layer is insufficient, resulting in a high risk of peeling. Third, the humidity sensing threshold is inaccurate and the resistance change rate is low, making it impossible to achieve effective feedback. Fourth, the parameter control in the manufacturing process is vague, resulting in poor product performance consistency.

[0004] Based on this, developing an antique-style sheepskin leather that combines high tear strength, wear resistance, and fatigue resistance with precise humidity sensing and intuitive color-changing feedback is of great significance for enhancing the competitiveness of sports shoe products. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a high-performance antique-style sheepskin leather for sports shoes with humidity sensing function and its preparation method, thereby achieving accurate sensing of humidity inside the shoe.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a high-performance sheepskin leather for antique-style sports shoes with humidity sensing function, comprising, from bottom to top, a base fabric layer, an intermediate bonding layer, and a sheepskin leather surface layer; the base fabric layer uses a high-performance modified nonwoven fabric as the base fabric substrate, and internally weaves a composite lithium titanate humidity sensing network; the sheepskin leather surface layer is a porous polyurethane layer containing water-soluble carbon nanotubes; and the intermediate bonding layer is a water-soluble PU adhesive layer containing a pore-forming agent.

[0008] In the above technical solution, the base fabric layer is a reinforced polypropylene microfiber skin.

[0009] In the above technical solutions, the tear strength of the base fabric layer is ≥25 N / mm, the abrasion resistance is ≥5000 cycles / grade, and the air permeability is ≥150 g / (m²). 2•24h).

[0010] In the above technical solution, in the base fabric layer, the humidity sensing material lithium titanate is composited in the base fabric substrate by warp and weft weaving to construct a uniformly distributed three-dimensional sensing network.

[0011] In the above technical solutions, the amount of lithium titanate added is 8%-12% of the mass of the base fabric substrate, and the weaving density is 20-30 threads / cm; when the relative humidity reaches 85%±5%, the resistance change rate of the lithium titanate sensing network is ≥90%.

[0012] In the above technical solution, lithium titanate is composited into the base fabric substrate through a warp and weft weaving method as a sensing layer. The sensing layer is immersed in a solvent of anhydrous ethanol:deionized water = 90 g:10 g, and dilute ammonia is added to adjust the pH of the system to between 8 and 10 to activate the hydroxyl groups on the surface of lithium titanate. TEOS dilution solution is added to the above system, with a TEOS:anhydrous ethanol volume ratio of 1:10. The total amount of TEOS added is 2.0% to 5.0% of the mass of lithium titanate. The reaction temperature is 33-37℃, and the reaction time is 2-3 hours. Finally, a continuous mesoporous hydrophilic coating layer with a thickness of 5-20 nm and a pore size of 0.5-2 nm is formed on the surface of lithium titanate.

[0013] Secondly, the present invention provides a method for preparing the above-mentioned sheepskin leather, comprising the following steps:

[0014] Step 1, Preparation of the base fabric layer:

[0015] Using high-property-value modified nonwoven fabric as the base material, lithium titanate humidity-sensing material is composited into the base material through warp and weft weaving to construct a uniformly distributed three-dimensional sensing network, thus obtaining the base fabric layer.

[0016] Step 2, Preparation of sheepskin surface layer:

[0017] Step 21: Add the aqueous carbon nanotube dispersion as the positive electrode conductive material to the aqueous PU slurry at a mass ratio of 5%-8%, and then add 3%-5% of film-forming aid. Stir evenly to obtain the positive electrode conductive slurry.

[0018] Step 22: Add a humidity-sensitive color-changing dye to the positive electrode conductive paste at a mass ratio of 2%-3%, and stir until uniformly dispersed to obtain a modified conductive paste;

[0019] Step 23: The modified conductive paste is coated onto the release paper with an antique sheepskin texture using a scraper coating method, and then sent into an oven for segmented drying: first, pre-drying at 60-70℃ for 15-20 min to remove excess solvent from the paste, and then heating to 90-100℃ for 20-30 min to form a polyurethane conductive skin layer with a porous structure, namely the sheepskin surface layer;

[0020] Step 3, Preparation of intermediate bonding layer adhesive:

[0021] Solvent-free polyurethane is selected as the intermediate layer material, and conductive carbon black is mixed into the intermediate layer at a mass ratio of 10%-15% and stirred evenly to obtain the intermediate bonding layer adhesive.

[0022] Step 4, Overall Fitting and Curing:

[0023] The intermediate bonding layer adhesive is uniformly coated on the surface of the base fabric layer to form a bonding layer. Then, the non-textured surface of the sheepskin leather surface is bonded to the bonding layer and pressed together using a pressing machine. After curing and release treatment, the sheepskin leather is obtained.

[0024] In the above technical solution, the curing process includes a first curing stage and a second curing stage. The first curing stage involves sending the laminated base fabric layer, intermediate bonding layer, sheepskin surface layer, and release paper into an oven and curing them at 110-140℃ for 8-12 minutes. The second curing stage involves rolling the cured semi-finished product into a winding rack and transferring it to a constant temperature room at 50-70℃ for curing for 24-36 hours.

[0025] In the above technical solution, the release process is as follows: the finished product after curing is unwound from the winding rack, and the release paper is separated along the interface between the release paper and the surface of the sheepskin to obtain the sheepskin.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. High physical properties: Using reinforced polypropylene microfiber leather as the base fabric and with precise manufacturing process, the product has a tear strength ≥35 N / mm, abrasion resistance ≥30,000 times / grade, and peel strength ≥25 N / mm, which fully meets the usage requirements of sports shoes.

[0028] 2. Precise humidity sensing: By optimizing the amount of lithium titanate added and the weaving process, a stable sensing network is constructed to achieve accurate identification of critical humidity of 85%±5% (accuracy of ±1.5% RH humidity), with a resistance change rate ≥90%, high sensing sensitivity and strong stability.

[0029] 3. Intuitive color change feedback: Provides two controllable color change response modes with obvious color difference, which can intuitively reflect the humidity status inside the shoe and improve the wearing experience.

[0030] 4. Stable and reliable process: Clearly define the range and optimal values ​​of key parameters for each step, reduce the impact of parameter fluctuations on product performance, and improve the consistency of mass production. Detailed Implementation

[0031] To better illustrate the objectives, technical solutions, and advantages of this invention, the invention will be further described below in conjunction with specific embodiments. This invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. This invention will be defined only by the claims.

[0032] This invention provides a high-performance sheepskin leather with humidity sensing function for antique-style athletic shoes. Its core structure, from bottom to top, includes a base fabric layer, an intermediate bonding layer, and a sheepskin leather surface layer. These layers work together to achieve load-bearing, sensing, appearance presentation, and humidity signal transmission and response functions. The specific structural design is as follows:

[0033] 1. Base fabric layer

[0034] High-performance modified nonwoven fabric was selected as the base material, preferably reinforced polypropylene microfiber leather (purchased from Hexin Kuraray). This base material must meet the following requirements: tear strength ≥ 25 N / mm, abrasion resistance ≥ 5000 cycles / grade, and air permeability ≥ 150 g / (m²). 2 • 24h) to ensure that the material meets the load-bearing performance and breathability requirements for use in sports shoes.

[0035] Lithium titanate, a humidity-sensing material, is incorporated into a base fabric substrate using a warp and weft weaving method to construct a uniformly distributed three-dimensional sensing network. The amount of lithium titanate added is controlled to be 8%-12% (preferably 10%) of the base fabric substrate mass: when the addition amount is less than 8%, the sensing network is discontinuous and the resistance change rate is insufficient; when it is more than 12%, it will reduce the toughness and breathability of the base fabric, resulting in a decrease in elongation at break of ≥30%. During the weaving process, the weaving density is controlled at 20-30 threads / cm to ensure a balance between the conductivity of the sensing network and the original physical properties of the base fabric.

[0036] Lithium titanate is incorporated into a base fabric substrate via a warp and weft weave process as a sensing layer. The sensing layer is immersed in a solvent of anhydrous ethanol:deionized water (90 g:10 g) for 25-45 minutes. Dilute ammonia is added to adjust the pH to 8-10, activating the hydroxyl groups on the lithium titanate surface. Tetraethyl orthosilicate (TEOS) dilution is then added to this system at a TEOS:ethanol volume ratio of 1:10, with the total TEOS addition being 2.0%–5.0% of the lithium titanate mass. Under weakly alkaline conditions, TEOS hydrolyzes and deposits on the sensing layer surface. The hydroxyl groups on the lithium titanate surface and the surface charge of SiO2 nanoparticles adsorb together, resulting in in-situ growth of SiO2 nanoparticles on the sensing layer surface. By controlling the temperature at 33-37℃ and the reaction time at 2-3 hours, a continuous mesoporous hydrophilic coating layer with a thickness of 5–20 nm and a pore size of 0.5–2 nm is finally formed on the lithium titanate surface.

[0037] The lithium titanate sensing layer is coated with an ultrathin hydrophilic coating as described above, which allows water molecules (water vapor) to pass through to achieve humidity response, while preventing liquid water from directly contacting lithium titanate. The coating thickness is controlled at 5~20nm to avoid affecting water vapor adsorption.

[0038] 2. Sheepskin surface

[0039] (1) Use water-based carbon nanotube dispersion as positive electrode conductive material (to improve surface conductivity and ensure that humidity signal is transmitted from the sensing network to the surface dye). Add it to water-based polyurethane resin at a mass ratio of 5%-8%, and then add 0.1%-2% water-based leveling agent, 0.1%-2% water-based defoamer and 0.1%-2% water-based thickener. Stir at a speed of 800-1200 r / min for 30-40 min to ensure uniform mixing and at the same time ensure that the slurry has good film-forming properties and the ability to replicate antique textures.

[0040] (2) In the above positive electrode conductive paste, a humidity-sensitive color-changing dye (preferably a reversible organic color-changing dye) is mixed in at a mass ratio of 2%-3%, and stirred for 15-20 min until uniformly dispersed. The dye needs to achieve a rapid and reversible response with the water vapor conducted by the lithium titanate sensing network, and not affect the film formation of the PU paste and the antique appearance of the sheepskin surface.

[0041] (3) The modified conductive paste is coated onto release paper with an antique sheepskin texture using a scraper coating method. The coating thickness is controlled at 80-120 μm. Then, it is sent to an oven for segmented drying: first, it is pre-dried at 60-70℃ for 15-20 min to remove excess solvent from the paste, and then the temperature is raised to 90-100℃ for 20-30 min to form a polyurethane conductive skin layer with a porous structure (pore size 1-5 μm), i.e., the sheepskin surface layer. This porous structure can achieve rapid water vapor penetration, ensuring that the water vapor inside the shoe can be smoothly transmitted to the surface layer after contacting the lithium titanate sensing network in the base fabric layer. At the same time, the surface resistance of the surface layer is controlled at 500-2000 Ω·m after drying, ensuring that the humidity signal is efficiently transmitted from the lithium titanate sensing network to the color-changing dye on the surface layer, avoiding signal attenuation.

[0042] 3. Intermediate bonding layer

[0043] Solvent-free polyurethane is selected as the intermediate layer material. Conductive carbon black is mixed into the intermediate layer at a mass ratio of 10%-15% and stirred evenly (600-800 r / min, stirring for 20 min) to improve the conductivity of the intermediate layer and ensure unimpeded transmission of humidity signals between the lithium titanate sensing network of the base fabric layer and the sheepskin surface layer.

[0044] 4. Overall fit and maturation

[0045] The intermediate bonding layer adhesive is uniformly coated on the surface of the base fabric layer (containing the lithium titanate sensing network), with the coating thickness controlled at 30-50 μm. Then, the non-textured surface of the sheepskin surface layer (with release paper) is bonded to the bonding layer using a press machine. The pressing temperature is 80-90℃, the pressing pressure is 0.3-0.5 MPa, and the pressing time is 5-8 min. This ensures that each layer is tightly bonded, without bubbles or delamination, while avoiding damage to the continuity of the lithium titanate three-dimensional sensing network during the pressing process.

[0046] First stage of curing: The laminated base fabric layer + intermediate bonding layer + sheepskin surface layer + release paper are sent into the oven and cured at 110-140℃ for 8-12 minutes to allow each layer to fully cross-link and solidify.

[0047] The second stage of curing: The cured semi-finished product is rolled up to a winding rack and placed in a constant temperature room at 50-70℃ (preferably 60℃) for 24-36 hours to further improve structural stability and bonding strength.

[0048] Release treatment: After the finished product has matured, it is unwound from the winding rack, and the release paper is separated from the surface of the sheepskin along the interface between the release paper and the surface of the sheepskin to obtain a finished antique sheepskin product with high toughness and stable electrical conductivity.

[0049] Table 1 shows the typical formulation composition of each layer of slurry (parts by weight).

[0050]

[0051] Table 2 Process Control Parameters

[0052]

[0053] Table 3 Examples of each component

[0054]

[0055] In this invention, a lithium titanate sensing network in the base fabric layer enables precise sensing of humidity inside the shoe. The core response mechanism is as follows: When the relative humidity inside the shoe increases, water vapor permeates to the base fabric layer through the porous structure of the sheepskin surface and the intermediate bonding layer. After the lithium titanate adsorbs the water vapor, the surface water molecules dissociate and react with the Li₂ on the surface of the lithium titanate lattice. + Proton exchange occurs, producing freely mobile H atoms. + The charge carriers cause a significant decrease in the resistance of the lithium titanate sensing network; when the relative humidity inside the shoe decreases, the water vapor adsorbed on the surface of the lithium titanate is desorbed, proton exchange occurs reversibly, and the resistance returns to its initial state, realizing a reversible response to the humidity signal.

[0056] Key performance indicators: When the relative humidity inside the shoe rises to the critical value of 85%±5% (the critical humidity value for comfortable wear of sports shoes), the resistance change rate of the lithium titanate sensing network is ≥90% (compared to the dry state, which is defined as relative humidity ≤40%), ensuring that the humidity signal can be clearly captured and transmitted; at the same time, the response time of the lithium titanate sensing network is <10s, the recovery time is <15s, with no obvious lag, adapting to the dynamic humidity change scenarios when wearing sports shoes.

[0057] Based on the humidity signal transmission function of the lithium titanate sensing network and combined with the positive and negative electrode connection logic of the power supply, a visualized feedback of direct chemical response is realized: In this system, the positive electrode of the battery is connected to the carbon nanotubes on the surface of the sheepskin, and the negative electrode of the battery is connected to the lithium titanate sensing network on the base fabric. The two are connected efficiently and stably through an intermediate bonding layer to form a complete sensing-power supply circuit. The specific connection method is as follows: The intermediate bonding layer serves as the core connecting carrier. Its bottom is tightly attached to the lithium titanate sensing network on the base fabric and is conductive. Its top is firmly bonded to the conductive layer of the carbon nanotubes on the sheepskin surface and is seamlessly conductive. With the help of the continuous conductive path constructed by conductive carbon black, an unobstructed conductive connection between the carbon nanotubes and lithium titanate is realized, ensuring stable power transmission from the battery and ensuring that the humidity resistance change signal captured by the lithium titanate can be efficiently transmitted to the surface layer where the carbon nanotubes are located. When the lithium titanate sensing network detects high humidity inside the shoe, its resistance changes significantly. This signal is transmitted to the surface of the carbon nanotube through the conductive path of the intermediate binding layer. At the same time, the battery-powered drive signal triggers the humidity-sensitive color-changing dye pre-mixed in the surface PU slurry, causing the dye to undergo a reversible change in molecular structure after contact with water vapor, resulting in a significant color change.

[0058] The sheepskin of this invention has a "sandwich structure" consisting of a "reinforced polypropylene microfiber leather base layer + an aqueous PU intermediate bonding layer containing a pore-forming agent + a porous polyurethane sheepskin surface layer containing aqueous carbon nanotubes" from bottom to top. A button cell connects the positive and negative electrodes, and each layer works synergistically to achieve load-bearing, sensing, appearance presentation, and humidity signal transmission and response functions. Each layer has a clearly defined function (load-bearing, bonding, sensing and transmission + appearance presentation). An ultra-thin hydrophilic coating is applied to the lithium titanate sensing layer, allowing water molecules (water vapor) to pass through for humidity response while preventing direct contact between liquid water and lithium titanate. The coating thickness is controlled at 5-20 nm to avoid affecting water vapor adsorption.

[0059] The sensing structure of this invention is as follows: a "lithium titanate humidity sensing network" (woven composite method) is built into the base fabric layer, and a "water-based carbon nanotube positive electrode conductive layer" is integrated into the sheepskin surface layer, forming a "lithium titanate negative electrode - carbon nanotube positive electrode" humidity sensing system.

[0060] The miniature button cell powers the "sandwich structure," and its core function is to transmit the resistance change signal of lithium titanate after it comes into contact with moisture, which is then linked to the surface color-changing dye to achieve visual feedback.

[0061] Connection method: The positive terminal of the micro button battery is connected to the positive conductive layer of carbon nanotubes on the surface of sheepskin, and the negative terminal is connected to the reserved lead of the lithium titanate sensing network in the base fabric layer, forming a complete "power-sensing-signal transmission-visualization" loop to ensure stable implementation of humidity sensing and feedback functions.

[0062] Example 1

[0063] 1. Base fabric layer: Reinforced polypropylene microfiber leather (Hexin Kuraray) is selected, the amount of lithium titanate added is 10% of the weight of the base fabric substrate, and the weaving density is 25 threads / cm.

[0064] 2. Intermediate bonding layer: water-based polyurethane adhesive, mixed with 12% conductive carbon black by mass, stirred at 700 r / min for 20 min, with a coating thickness of 40 μm.

[0065] 3. Sheepskin surface: 7% water-based carbon nanotube dispersion (relative to water-based PU slurry), 4% film-forming aid, 2.5% color-changing dye, coating thickness 100μm, segmented drying parameters are 65℃ pre-drying for 18min and 95℃ drying for 25min.

[0066] 4. Overall bonding and curing: Pressing temperature 85℃, pressure 0.4MPa, time 6min; first curing stage 120℃, 10min; second curing stage 60℃, 30h.

[0067] 5. Performance test results:

[0068] Physical properties: tear strength 38 N / mm, no wear after 50,000 Martin abrasion tests, air permeability 180 g / (m²). 2 • 24h), the elongation at break did not decrease, and the bond was tight without delamination.

[0069] Sensing performance: Resistance change rate of 92% at 85%±5%RH, response time of 8s, recovery time of 12s, and linear correlation coefficient R0. 2 =0.97, performance decays by 4% after 1000 cycles of sensing.

[0070] Visual performance: Light brown in dry state, dark brown in high humidity state, color difference ΔE=6.2, clearly identifiable to the naked eye.

[0071] Conductive connection performance: The contact resistance between carbon nanotubes and lithium titanate is 80Ω, there is no signal attenuation, and the battery power supply is stable (the micro button battery can work continuously for 10 months).

[0072] Example 2:

[0073] The difference from Example 1 is that the carbon nanotube dispersion added in step 2 is 8%; when the relative humidity inside the shoe rises to 80%, the color difference ΔE=5.8 and the resistance change rate is 90%.

[0074] Comparative Example 1

[0075] The only difference from Example 1 is that the amount of lithium titanate added is 7% (preferred range below 8%), and all other parameters are exactly the same.

[0076] Performance test results:

[0077] Sensing performance: The lithium titanate sensing network is discontinuous, with a resistance change rate of only 81% at 85%±5%RH, making it unable to effectively capture humidity signals. The response time is extended to 15s, the recovery time to 20s, and the linear correlation coefficient R... 2 =0.82, which makes stable sensing impossible.

[0078] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A type of antique-style high-performance sheepskin leather for athletic shoes with humidity sensing function, characterized in that: From bottom to top, the layers are: a base fabric layer, an intermediate bonding layer, and a sheepskin outer layer. The base fabric layer uses a high-performance modified nonwoven fabric as the base material and has a composite lithium titanate humidity sensing network woven inside. The sheepskin outer layer is a porous polyurethane layer containing water-soluble carbon nanotubes. The intermediate bonding layer is a water-based PU adhesive layer containing a pore-forming agent.

2. The sheepskin leather according to claim 1, characterized in that: The base fabric layer is reinforced polypropylene microfiber skin.

3. The sheepskin leather according to claim 1, characterized in that: The base fabric layer has a tear strength ≥25 N / mm, abrasion resistance ≥5000 cycles / grade, and air permeability ≥150 g / (m²). 2 •24h).

4. The sheepskin leather according to claim 1, characterized in that: In the base fabric layer, the humidity-sensing material lithium titanate is composited into the base fabric substrate through a warp and weft weaving method to construct a uniformly distributed three-dimensional sensing network.

5. The sheepskin leather according to claim 1, characterized in that: The amount of lithium titanate added is 8%-12% of the mass of the base fabric, and the weaving density is 20-30 threads / cm; when the relative humidity reaches 85%±5%, the resistance change rate of the lithium titanate sensing network is ≥90%.

6. The sheepskin leather according to claim 1, characterized in that: Lithium titanate is composited into a base fabric substrate using a warp and weft weaving method as a sensing layer. The sensing layer is immersed in a solvent of anhydrous ethanol:deionized water = 90 g:10 g, and dilute ammonia is added to adjust the pH of the system to between 8 and 10 to activate the hydroxyl groups on the surface of lithium titanate. TEOS dilution is added to the above system, with a TEOS:anhydrous ethanol volume ratio of 1:

10. The total amount of TEOS added is 2.0% to 5.0% of the mass of lithium titanate. The reaction temperature is 33-37℃, and the reaction time is 2-3 hours. Finally, a continuous mesoporous hydrophilic coating layer with a thickness of 5-20 nm and a pore size of 0.5-2 nm is formed on the surface of lithium titanate.

7. The method for preparing sheepskin according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1, Preparation of the base fabric layer: Using high-property-value modified nonwoven fabric as the base material, lithium titanate humidity-sensing material is composited into the base material through warp and weft weaving to construct a uniformly distributed three-dimensional sensing network, thus obtaining the base fabric layer. Step 2, Preparation of sheepskin surface layer: Step 21: Add the aqueous carbon nanotube dispersion as the positive electrode conductive material to the aqueous PU slurry at a mass ratio of 5%-8%, and then add 3%-5% of film-forming aid. Stir evenly to obtain the positive electrode conductive slurry. Step 22: Add a humidity-sensitive color-changing dye to the positive electrode conductive paste at a mass ratio of 2%-3%, and stir until uniformly dispersed to obtain a modified conductive paste; Step 23: The modified conductive paste is coated onto the release paper with an antique sheepskin texture using a scraper coating method, and then sent into an oven for segmented drying: first, pre-drying at 60-70℃ for 15-20 min to remove excess solvent from the paste, and then heating to 90-100℃ for 20-30 min to form a polyurethane conductive skin layer with a porous structure, namely the sheepskin surface layer; Step 3, Preparation of intermediate bonding layer adhesive: Solvent-free polyurethane is selected as the intermediate layer material, and conductive carbon black is mixed into the intermediate layer at a mass ratio of 10%-15% and stirred evenly to obtain the intermediate bonding layer adhesive. Step 4, Overall Fitting and Curing: The intermediate bonding layer adhesive is uniformly coated on the surface of the base fabric layer to form a bonding layer. Then, the non-textured surface of the sheepskin leather surface is bonded to the bonding layer and pressed together using a pressing machine. After curing and release treatment, the sheepskin leather is obtained.

8. The preparation method according to claim 7, characterized in that: The curing process includes a first curing stage and a second curing stage. The first curing stage involves sending the laminated base fabric layer, intermediate bonding layer, sheepskin surface layer, and release paper into an oven and curing them at 110-140℃ for 8-12 minutes. The second curing stage involves rolling the cured semi-finished product into a winding rack and transferring it to a constant temperature room at 50-70℃ for curing for 24-36 hours.

9. The preparation method according to claim 7, characterized in that: The release process is as follows: the finished product after curing is unwound from the winding rack, and the release paper is separated from the surface of the sheepskin along the interface between the release paper and the sheepskin, thus obtaining the sheepskin.

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