Personal heat and humidity management leather with one-way moisture conduction and heating performance and preparation method

Abstract

The invention discloses a preparation method of personal heat and humidity management leather with one-way humidity guiding and heating performance. The preparation method specifically comprises the following steps: preparing zirconium tanned leather; preparing an MXene (at) PDA solution; preparing a PDMS solution; and placing zirconium tanned leather in a polyether amine aqueous solution, taking out the zirconium tanned leather, airing the zirconium tanned leather until no liquid drops exist on the surface of the zirconium tanned leather, brushing the surface of the zirconium tanned leather with an MXene PDA solution, spraying a PDMS solution on the surface of the zirconium tanned leather, and naturally airing the zirconium tanned leather to obtain the MXene PDA / PDMS leather. The invention further discloses personal heat and humidity management leather with one-way moisture conduction and heating performance, the personal heat and humidity management leather has excellent one-way moisture conduction and photo-thermal conversion performance, and the wearable comfort of a human body is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional leather preparation, and specifically relates to personal thermal moisture management leather with both unilateral moisture conduction and heating properties. The present invention also relates to a preparation method of the personal thermal moisture management leather with both unilateral moisture conduction and heating properties. Background Art

[0002] In recent years, the global climate change situation has become increasingly severe, and extreme weather has occurred frequently. In cold seasons, the sharp increase in heating demand has exacerbated the energy crisis and further worsened the greenhouse effect. Traditional heating methods rely on electric drive and coal energy, which have significant defects of high energy consumption and low efficiency, and ignore the significant differences in thermal comfort among different individuals. In contrast, personal thermal management technology focuses on the heat exchange process between the microclimate on the surface of human skin and the surrounding environment. Compared with the complex and large building space heating system with huge energy consumption, it is more energy-efficient and efficient, and can better meet the personalized needs of different groups of people for thermal comfort, providing a new and effective way to solve the energy crisis and improve individual thermal comfort experience.

[0003] Leather has a natural and unique texture and luster, and is widely loved by consumers. However, the lack of traditional leather in terms of warmth retention and sweat management limits its functional and intelligent development. On the one hand, the thermal insulation performance of leather in cold winter weather is poor, and it is difficult to meet the user's warmth needs. On the other hand, when the wearer sweats after exercise, sweat easily accumulates inside the leather, thereby breeding mold, which not only damages the quality and value of leather clothing, but also reduces the wearable comfort of the human body because the sweat cannot be discharged in time. Therefore, it is imperative to develop a one-way moisture-conducting and heating leather to enhance the thermal and moisture comfort of the human body and increase the added value of leather. Summary of the invention

[0004] The purpose of the present invention is to provide a personal thermal moisture management leather with both unidirectional moisture conduction and heating properties, which has excellent unidirectional moisture conduction and light-to-heat conversion properties, and effectively improves the wearable comfort of the human body.

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned personal thermal moisture management leather having both unidirectional moisture conduction and heating properties.

[0006] The technical solution adopted by the present invention is a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 2: Preparation of MXene@PDA solution; Step 3: Prepare PDMS solution; Step 4: Place the zirconium tanned leather in a polyetheramine aqueous solution, take it out and air it until there is no droplet on the surface of the zirconium tanned leather, then brush the MXene@PDA solution on its surface, spray the PDMS solution on the flesh side, and dry it naturally to obtain MXene@PDA / PDMS leather.

[0007] The present invention is also characterized in that: Step 1 specifically includes the following steps: Step 1.1: Place sour peel, sodium chloride and deionized water in a drum and process for 30 minutes at 26°C and 110 rpm; the mass ratio of sour peel, sodium chloride and deionized water is 1:0.16:2; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, and then add zirconium tanning agent to continue the reaction for 4 hours; the mass ratio of zirconium tanning agent to acid leather is 0.16:1; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather.

[0008] In step 1.2, the zirconium tanning agent is zirconium sulfate tetrahydrate.

[0009] Step 2 specifically includes the following steps: Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.2: Weigh the MXene nanosheet dispersion, add tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; the mass ratio of the MXene nanosheet dispersion to tris(hydroxymethyl)aminomethane is 1:0.015-0.09; Step 2.3: Add dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain a MXene@PDA solution; the mass ratio of the MXene nanosheet dispersion to dopamine hydrochloride is 1:0.025~0.15.

[0010] Step 2.1 specifically includes the following steps: Step 2.1.1: Weigh lithium fluoride and add it to hydrochloric acid solution. After magnetic stirring for 30 min, add titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The mass ratio of lithium fluoride, hydrochloric acid solution and titanium aluminum carbide is 1:11.8:0.5. The concentration of hydrochloric acid solution is 36%, and the molar concentration of hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add hydrochloric acid solution and deionized water again, and centrifuge 5 times at 4000 rpm, 5 min and 8000 rpm, 5 min to collect the precipitate; the mass ratio of hydrochloric acid solution to deionized water is 1:1, and the molar concentration of hydrochloric acid solution is 1 mol / L; 86 mL of 36% concentrated hydrochloric acid and the rest is water to prepare 1 L of hydrochloric acid solution; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0011] Step 3 is as follows: Weigh polydimethylsiloxane prepolymer and curing agent and dissolve them in n-hexane, and ultrasonicate them at room temperature for 10 min to form a uniform PDMS dispersion; the mass ratio of n-hexane, polydimethylsiloxane prepolymer and curing agent is 1:0.03:0.003.

[0012] The curing agent is vinyl polydimethylsiloxane polymer.

[0013] The polyetheramine aqueous solution in step 4 is prepared according to the following steps: polyetheramine is dissolved in deionized water to obtain a polyetheramine aqueous solution, wherein the mass ratio of polyetheramine to deionized water is 1:10; The coating amount of MXene@PDA solution is 200~600 g / m 2 The spraying amount of PDMS solution is 200~600 g / m 2 .

[0014] Another technical solution adopted by the present invention is to use the above method to prepare personal thermal moisture management leather with both unidirectional moisture conduction and heating properties.

[0015] The beneficial effects of the present invention are: The personal thermal and moisture management leather of the present invention has both unidirectional moisture conduction and heating properties. By using the MXene@PDA layer, leather, and PDMS layer to construct a hydrophilic and hydrophobic wetting gradient, the MXene@PDA layer has excellent light-to-heat conversion performance. According to the data verification of the optimal embodiment, the unidirectional transmission index of the MXene@PDA / PDMS leather in the forward water transmission direction (from the PDMS side to the MXene@PDA side) is 541%, and the unidirectional transmission index in the reverse water transmission direction is -1019%. At the same time, the leather prepared by the optimal embodiment of the present invention was subjected to an outdoor temperature rise test, and the average temperature was measured to be 48.24 ℃. The above experimental data show that the leather of the present invention has excellent unidirectional moisture conduction and heating properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for preparing personal heat and moisture management leather having both unidirectional moisture conduction and heating performances of the present invention; Figure 2 This is a curve diagram of the relative moisture content on both sides of the personal thermal and moisture management leather with unidirectional moisture conduction and heating performance prepared in Example 3 of the present invention when salt water is dripped onto the PDMS side; Figure 3 This is a curve diagram of the relative moisture content on both sides of the personal thermal moisture management leather with unidirectional moisture conduction and heating performance prepared in Example 3 of the present invention when salt water is dripped onto the MXene@PDA side; Figure 4 This is a photothermal temperature-time curve of untreated leather, MXene leather and personal thermal moisture management leather with unidirectional moisture conduction and heating properties prepared in Example 3 of the present invention under outdoor conditions on a sunny day in winter. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The preparation method of the personal heat and moisture management leather having both unidirectional moisture conduction and heating performance of the present invention is as follows: Figure 1 As shown, the specific steps include: Step 1: preparing zirconium tanned leather, which specifically includes: Step 1.1: Place sour peel, sodium chloride and deionized water in a rotary drum and treat for 30 minutes at 26°C and 110 rpm; the mass ratio of sour peel, sodium chloride and deionized water is 1:0.16:2.

[0019] Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, and then add zirconium tanning agent to continue the reaction for 4 hours. The zirconium tanning agent is zirconium sulfate tetrahydrate. The mass ratio of zirconium tanning agent to acid leather is 0.16:1.

[0020] Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather.

[0021] Step 2: Prepare MXene@PDA solution. Specifically including: Step 2.1: Preparation of MXene nanosheet dispersion.

[0022] Step 2.1.1: Weigh lithium fluoride and add it to hydrochloric acid solution. After magnetic stirring for 30 min, add titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The mass ratio of lithium fluoride, hydrochloric acid solution and titanium aluminum carbide is 1:11.8:0.5. The concentration of hydrochloric acid solution is 36%, and the molar concentration of hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add hydrochloric acid solution and deionized water again, and centrifuge 5 times at 4000 rpm, 5 min and 8000 rpm, 5 min to collect the precipitate; the mass ratio of hydrochloric acid solution to deionized water is 1:1, and the molar concentration of hydrochloric acid solution is 1 mol / L; 86 mL of 36% concentrated hydrochloric acid and the rest is water to prepare 1 L of hydrochloric acid solution; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0023] Step 2.2: Weigh the MXene nanosheet dispersion, add tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; the mass ratio of the MXene nanosheet dispersion to tris(hydroxymethyl)aminomethane is 1:0.015-0.09; Step 2.3: Add dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain a MXene@PDA solution; the mass ratio of the MXene nanosheet dispersion to dopamine hydrochloride is 1:0.025~0.15.

[0024] Step 3: Prepare PDMS solution. Specifically: Weigh polydimethylsiloxane prepolymer and curing agent and dissolve them in n-hexane, and ultrasonicate for 10 min at room temperature to form a uniform PDMS dispersion. The curing agent is vinyl polydimethylsiloxane polymer, and the mass ratio of n-hexane, polydimethylsiloxane prepolymer, and curing agent is 1:0.03:0.003.

[0025] Step 4: Place the zirconium tanned leather in a polyetheramine aqueous solution, which is prepared according to the following steps: dissolve polyetheramine in deionized water to obtain a polyetheramine aqueous solution, and the mass ratio of polyetheramine to deionized water is 1:10. After taking out and airing until there is no droplet on the surface of the zirconium tanned leather, brush the MXene@PDA solution on its surface, spray the PDMS solution on the flesh side, and dry it naturally to obtain MXene@PDA / PDMS leather.

[0026] The coating amount of MXene@PDA solution is 200~600 g / m 2 The spraying amount of PDMS solution is 200~600 g / m 2 .

[0027] Example 1 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0028] Step 2: Preparation of MXene@PDA solution.

[0029] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest water to prepare 1 L of hydrochloric acid solution.

[0030] Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0031] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.015 g of tris(hydroxymethyl)aminomethane, and then add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.025 g dopamine hydrochloride to the solution system of step 2.2, and react at 60 °C and 300 rpm for 24 h to finally obtain MXene@PDA solution.

[0032] Step 3: Prepare PDMS solution.

[0033] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0034] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min, take it out and air it until there is no droplet on the surface of the zirconium tanned leather, then brush the MXene@PDA solution on its surface, spray the PDMS solution on the flesh side, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0035] Example 2 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0036] Step 2: Preparation of MXene@PDA solution.

[0037] Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0038] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.03 g of tris(hydroxymethyl)aminomethane, and then add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.05 g of dopamine hydrochloride to the solution system of step 2.2, and react at 60 °C and 300 rpm for 24 h to finally obtain MXene@PDA solution.

[0039] Step 3: Prepare PDMS solution.

[0040] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0041] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0042] Example 3 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26°C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm×5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0043] Step 2: Preparation of MXene@PDA solution.

[0044] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0045] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.045 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.075 g dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain MXene@PDA solution.

[0046] Step 3: Prepare PDMS solution.

[0047] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0048] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0049] The personal thermal moisture management leather with unidirectional moisture conduction and heating performance prepared in Example 3 was used to test the moisture conduction performance on the side sprayed with PDMS solution and the side coated with MXene@PDA solution. The results are as follows: Figure 2 and Figure 3 As shown in the figure, the unidirectional transmission index in the forward water transmission direction (from the PDMS side to the MXene@PDA side) is 541%, and the unidirectional transmission index in the reverse water transmission direction is -1019%. The results show that the MXene@PDA / PDMS leather prepared in this example has excellent unidirectional moisture conduction performance.

[0050] Example 4 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0051] Step 2: Preparation of MXene@PDA solution.

[0052] Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0053] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.06 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.1 g of dopamine hydrochloride to the solution system in step 2.2, and react at 60 °C and 300 rpm for 24 h to finally obtain MXene@PDA solution.

[0054] Step 3: Prepare PDMS solution.

[0055] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0056] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0057] Example 5 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0058] Step 2: Preparation of MXene@PDA solution.

[0059] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0060] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.075 g of tris(hydroxymethyl)aminomethane, and then add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.125 g of dopamine hydrochloride to the solution system of step 2.2, and react at 60 °C and 300 rpm for 24 h to finally obtain MXene@PDA solution.

[0061] Step 3: Prepare PDMS solution.

[0062] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0063] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0064] Example 6 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0065] Step 2: Preparation of MXene@PDA solution.

[0066] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0067] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.09 g of tris(hydroxymethyl)aminomethane, and then add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.15 g of dopamine hydrochloride to the solution system of step 2.2, and react at 60 °C and 300 rpm for 24 h to finally obtain MXene@PDA solution.

[0068] Step 3: Prepare PDMS solution.

[0069] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0070] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0071] Example 7 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0072] Step 2: Preparation of MXene@PDA solution.

[0073] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0074] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.045 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.075 g dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain MXene@PDA solution.

[0075] Step 3: Prepare PDMS solution.

[0076] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0077] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 200 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0078] Example 8 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0079] Step 2: Preparation of MXene@PDA solution.

[0080] Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0081] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.045 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.075 g dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain MXene@PDA solution.

[0082] Step 3: Prepare PDMS solution.

[0083] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0084] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 600 g / m 2 The spraying amount of PDMS solution is 400 g / m 2 .

[0085] Example 9 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0086] Step 2: Preparation of MXene@PDA solution.

[0087] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0088] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.045 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.075 g dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain MXene@PDA solution.

[0089] Step 3: Prepare PDMS solution.

[0090] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0091] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 200 g / m 2 .

[0092] Example 10 This embodiment provides a method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, which specifically comprises the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0093] Step 2: Preparation of MXene@PDA solution.

[0094] Step 2.1: Prepare MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0095] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, add 0.045 g of tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; Step 2.3: Add 0.075 g dopamine hydrochloride to the solution system of step 2.2, react at 60 °C and 300 rpm for 24 h, and finally obtain MXene@PDA solution.

[0096] Step 3: Prepare PDMS solution.

[0097] 0.3 g of polydimethylsiloxane prepolymer and 0.03 g of vinyl polydimethylsiloxane polymer were weighed and dissolved in 10 g of n-hexane, and ultrasonicated at room temperature for 10 min to form a uniform PDMS dispersion.

[0098] Step 4: Take 5 g of polyetheramine and dissolve it in 50 g of deionized water to prepare a polyetheramine aqueous solution. Place the zirconium tanned leather prepared in step 1 in the polyetheramine aqueous solution for 30 min. Take it out and let it air dry until there is no droplet on the surface of the zirconium tanned leather. Then, brush the surface with MXene@PDA solution, spray the flesh side with PDMS solution, and dry it naturally to obtain MXene@PDA / PDMS leather. The coating amount of MXene@PDA solution is 400 g / m 2 The spraying amount of PDMS solution is 600 g / m 2 .

[0099] Comparative Example: This comparative example provides MXene leather, which is prepared by the following steps: Step 1: preparing zirconium tanned leather; Step 1.1: 5 g of sour skin, 0.8 g of sodium chloride, and 10 g of deionized water were placed in a drum and treated at 26 °C and 110 rpm for 30 min; the area of ​​the sour skin was 5 cm × 5 cm; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, then add 0.8g of zirconium sulfate tetrahydrate and continue to react for 4 hours; prepare the formic acid solution according to the mass ratio of formic acid to deionized water of 1:10; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather. Prepare the sodium bicarbonate solution according to the mass ratio of sodium bicarbonate to deionized water of 1:20.

[0100] Step 2: Preparation of MXene solution.

[0101] Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.1.1: Weigh 2 g of lithium fluoride and add it to 20 mL of hydrochloric acid solution. After magnetic stirring for 30 min, add 1 g of titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching. The concentration of the hydrochloric acid solution is 36%, and the molar concentration of the hydrochloric acid solution is 11.64 mol / L. Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add 21.2 mL of hydrochloric acid solution and 25 mL of deionized water again, and centrifuge five times at 4000 rpm for 5 min and 8000 rpm for 5 min to collect the precipitate; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

[0102] Step 2.2: Weigh 1 g of MXene nanosheet dispersion, apply it evenly to the surface of zirconium tanned leather, and dry it naturally to obtain MXene leather.

[0103] The leather prepared in Example 3, the leather prepared in the comparative example and the untreated leather were subjected to an outdoor temperature rise test (108°58′ east longitude, 34°23′ north latitude). The results are as follows: Figure 4 As shown in the figure, the average temperature of MXene@PDA leather is 48.24 °C, which is 3.99 °C and 24.64 °C higher than the average temperatures of MXene leather and untreated leather, respectively, indicating excellent light-to-heat conversion performance.

Claims

1. A method for preparing a personal heat and moisture management leather having both unidirectional moisture conduction and heating performance, characterized in that: The specific steps include: Step 1: preparing zirconium tanned leather; Step 2: Preparation of MXene@PDA solution; Step 3: Prepare PDMS solution; Step 4: Place the zirconium tanned leather in a polyetheramine aqueous solution, take it out and air it until there is no droplet on the surface of the zirconium tanned leather, then brush the MXene@PDA solution on its surface, spray the PDMS solution on the flesh side, and dry it naturally to obtain MXene@PDA / PDMS leather.

2. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 1, characterized in that: Step 1 specifically includes the following steps: Step 1.1: Place sour peel, sodium chloride and deionized water in a drum and process for 30 min at 26°C and 110 rpm; the mass ratio of sour peel, sodium chloride and deionized water is 1:0.16:2; Step 1.2: Add formic acid solution to the drum for pickling treatment, adjust the system pH to 2.0, and then add zirconium tanning agent to continue the reaction for 4 hours; the mass ratio of zirconium tanning agent to acid leather is 0.16:1; Step 1.3: Add sodium bicarbonate solution to the drum to adjust the pH to 3.5, raise the temperature to 40 °C and continue the reaction for 1 h to prepare zirconium tanned leather.

3. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 2, characterized in that: The zirconium tanning agent in step 1.2 is zirconium sulfate tetrahydrate.

4. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 1, characterized in that: Step 2 specifically includes the following steps: Step 2.1: Preparation of MXene nanosheet dispersion; Step 2.2: Weigh the MXene nanosheet dispersion, add tris(hydroxymethyl)aminomethane, and add ammonia water dropwise to adjust the solution pH to 8.5; the mass ratio of the MXene nanosheet dispersion to tris(hydroxymethyl)aminomethane is 1:0.015-0.09; Step 2.3: Add dopamine hydrochloride to the solution system of step 2.2, react at 60 ° C and 300 rpm for 24 hours, and finally obtain a MXene@PDA solution; the mass ratio of the MXene nanosheet dispersion to dopamine hydrochloride is 1:0.025~0.

15.

5. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 4, characterized in that: Step 2.1 specifically includes the following steps: Step 2.1.1: Weigh lithium fluoride and add it to hydrochloric acid solution. After magnetic stirring for 30 min, add titanium aluminum carbide and stir continuously for 48 h at 40 °C for etching; the mass ratio of lithium fluoride, hydrochloric acid solution and titanium aluminum carbide is 1:11.8:0.5; the concentration of hydrochloric acid solution is 36%, and the molar concentration of hydrochloric acid solution is 11.64 mol / L; Step 2.1.2: After etching, centrifuge at 3500 rpm for 5 min to collect the precipitate; Step 2.1.3: Add hydrochloric acid solution and deionized water again, and centrifuge 5 times at 4000 rpm, 5 min and 8000 rpm, 5 min to collect the precipitate; the mass ratio of the hydrochloric acid solution to deionized water is 1:1; the molar concentration of the hydrochloric acid solution is 1 mol / L, which is 1 L of hydrochloric acid solution prepared by using 86 mL of 36% concentrated hydrochloric acid and the rest of water; Step 2.1.4: The black precipitate obtained by centrifugation was subjected to ultrasonic exfoliation for 1 h. The exfoliated solution was centrifuged at 3500 rpm for 30 min, and the supernatant was taken to obtain a single-layer or few-layer MXene nanosheet dispersion with a concentration of 5.0 mg / mL.

6. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 1, characterized in that: Step 3 is as follows: Weigh polydimethylsiloxane prepolymer and curing agent, dissolve them in n-hexane, and ultrasonicate them at room temperature for 10 min to form a uniform PDMS dispersion; the mass ratio of n-hexane, polydimethylsiloxane prepolymer and curing agent is 1:0.03:0.

003.

7. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 6, characterized in that: The curing agent is vinyl polydimethylsiloxane polymer.

8. The method for preparing the personal heat and moisture management leather with unidirectional moisture conduction and heating performance according to claim 1, characterized in that: In step 4: The polyetheramine aqueous solution is prepared according to the following steps: polyetheramine is dissolved in deionized water to obtain a polyetheramine aqueous solution, wherein the mass ratio of the polyetheramine to the deionized water is 1:10; The coating amount of MXene@PDA solution is 200~600 g / m 2 The spraying amount of PDMS solution is 200~600 g / m 2 .

9. Personal heat and moisture management leather with unidirectional moisture conduction and heating performance, characterized in that: It is prepared using the preparation method according to any one of claims 1 to 8.

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