A method for preparing a waterproof and breathable membrane for outdoor clothing

Abstract

This application discloses a method for preparing a waterproof and breathable membrane for outdoor clothing, relating to the field of clothing and apparel technology. The method includes the following steps: Step 1, spinning solution preparation: mixing and stirring a polymer resin with a solvent to prepare a spinning solution; Step 2, electrospinning: introducing the spinning solution obtained in Step 1 into an electrospinning machine, and obtaining a waterproof and breathable membrane preform through the spinning process; wherein the polymer resin includes TPU or PU, maleic anhydride-grafted chitosan and / or modified high-sodium bentonite, and phase change temperature-regulating microcapsules, and the maleic anhydride-grafted chitosan and / or modified high-sodium bentonite account for 3-12% of the mass of the polymer resin, and the phase change temperature-regulating microcapsules account for 20-42% of the mass of the polymer resin. This application achieves efficient and intelligent temperature control by combining maleic anhydride-grafted chitosan and phase change temperature-regulating microcapsules, thereby improving the compatibility of the phase change temperature-regulating microcapsules in the polymer resin and uniformly dispersing them in the polymer resin.

Description

Technical Field

[0001] This application relates to the field of clothing and apparel technology, and in particular to a method for preparing a waterproof and breathable membrane for outdoor clothing. Background Technology

[0002] Electrospinning, also known as electrospinning, is a process that uses a charged polymer solution or melt to jet in an electrostatic field to prepare polymer microfibers.

[0003] The electrospinning apparatus is simple in composition, consisting of a high-voltage power supply, a propulsion pump, a syringe, a needle, and a collector. During electrospinning, the positive terminal of the high-voltage power supply is connected to the needle, and the negative terminal is connected to the collector and grounded. During electrospinning, solution or melt droplets are propelled from the needle by the syringe and propulsion pump, becoming charged under high voltage and then stretched into fibers, which are collected by the collector. The specific principle is as follows: under the action of high voltage, the surface of the polymer solution or melt becomes charged, forming an electrostatic repulsion force opposite to the surface tension. When the electric field strength exceeds a critical value, the capillary filaments formed by the droplets are stretched into a cone shape, known as a "Taylor cone." A fine jet forms at the bottom of the Taylor cone. Due to bending instability, the jet undergoes a violent whipping motion after traveling a short distance in a straight line. Accompanied by solvent evaporation, the jet forms extremely fine fibers that deposit on the surface of the collector.

[0004] Chinese Patent CN113123128B discloses a waterproof and breathable membrane, its preparation method, and its application. The waterproof and breathable membrane includes a fiber matrix and a hydrophobic layer cross-linked with the fiber matrix. The preparation method of the waterproof and breathable membrane includes the following steps: S1: dissolving a hydrophilic polymer and a blocked solvent isocyanate in a solvent to obtain an electrospinning solution, and preparing the fiber matrix by electrospinning; S2: impregnating the fiber matrix prepared in step S1 in a waterproofing agent solution and then drying it.

[0005] However, this waterproof and breathable membrane only improves the durability of the membrane by fixing the waterproofing agent to the surface of the polymer fiber. As a result, it cannot actively adjust the body temperature according to the weather environment during use, which affects the high-end wearing experience and needs to be improved. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a method for preparing a waterproof and breathable membrane for outdoor clothing, so as to achieve intelligent temperature control based on body temperature changes. The specific solution is as follows:

[0007] A method for preparing a waterproof and breathable membrane for outdoor clothing includes the following steps:

[0008] Step 1, Preparation of spinning solution: Mix and stir the polymer resin and solvent to prepare the spinning solution;

[0009] Step 2, electrospinning: The spinning solution prepared in step 1 is introduced into an electrospinning machine, and a waterproof and breathable membrane preform is obtained through the spinning process.

[0010] The polymer resin includes TPU or PU, maleic anhydride-grafted chitosan and / or modified sodium-based bentonite, and phase change temperature-regulating microcapsules, wherein the maleic anhydride-grafted chitosan and / or modified sodium-based bentonite account for 3-12% of the polymer resin by mass, and the phase change temperature-regulating microcapsules account for 20-42% of the polymer resin by mass.

[0011] Preferably, the preparation method of maleic anhydride-grafted chitosan includes the following steps: Step ① Chitosan activation: dissolving chitosan in 1% glacial acetic acid solution to obtain a 2.5% (w / w) chitosan / glacial acetic acid solution; Step ② Grafting solution preparation: dissolving 2,3-diphenylmaleic anhydride in acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; Step ③ Grafting reaction: pouring the grafting solution into the chitosan / glacial acetic acid solution, stirring and reacting for 3-5 hours to obtain a grafting reaction solution; Step ④ Washing and discharging: adding alkaline liquid to the grafting reaction solution, adjusting the pH to 9 and obtaining a precipitate, and sequentially washing the precipitate with ethanol / acetone and drying to obtain the finished maleic anhydride-grafted chitosan.

[0012] Preferably, in step ③, 0.025 g / ml of cerium ammonium nitrate is added to the chitosan / glacial acetic acid solution as a catalyst, and the reaction is controlled under an inert gas atmosphere at a temperature of 90°C.

[0013] Preferably, in step ③, the molar ratio of chitosan in the chitosan / glacial acetic acid solution to 2,3-diphenylmaleic anhydride in the grafting solution is 1:2.

[0014] Preferably, in step ④, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

[0015] Preferably, the modified high-sodium bentonite is purchased from Wuhu Shuohua New Material Technology Co., Ltd., and has a bulk density of 0.61 g / ml.

[0016] Preferably, the mass ratio of maleic anhydride-grafted chitosan to modified sodium-based bentonite is 5:1-2.

[0017] Preferably, the phase change temperature-regulating microcapsules have a phase change enthalpy value ≥170J / g and are purchased from Forsmann's PCM.

[0018] Preferably, in step 2, the DC spinning voltage of the electrospinning is 12-25kV, the spinning solution propulsion and injection speed is 1.0-2.4mL / h, and the receiving distance is 8-15cm.

[0019] Preferably, the solvent for electrospinning is N,N-dimethylformamide or N,N-dimethylacetamide and acetone in a volume ratio of 1:2.2-2.8, and the polymer accounts for 12-20% of the mass fraction of the spinning solution.

[0020] As can be seen from the above solutions, this application provides a method for preparing a waterproof and breathable membrane for outdoor clothing, which has the following beneficial effects:

[0021] 1. By combining maleic anhydride-grafted chitosan with phase change temperature-regulating microcapsules, the compatibility of phase change temperature-regulating microcapsules in polymer resin is improved and they are uniformly dispersed in polymer resin, thereby achieving efficient and intelligent temperature control.

[0022] 2. By combining maleic anhydride-grafted chitosan and modified high-sodium bentonite when phase change temperature-regulating microcapsules are mixed with polymer resin and dispersed in solvent, the surface tension of the constituent materials is significantly reduced, thereby effectively improving the hydrostatic protection capability of the outdoor clothing waterproof and breathable membrane prepared by this method.

[0023] 3. Maleic anhydride-grafted chitosan obtained by grafting 2,3-diphenylmaleic anhydride with chitosan has effective compatibility with polymer resins and solvents, thereby obtaining a uniformly dispersed spinning solution.

[0024] 4. By reducing human body temperature fluctuations through the function of phase change temperature regulating microcapsules, the damage caused to the human body by excessive temperature difference can be avoided. The phase change temperature regulating microcapsules are combined with TPU or PU, maleic anhydride-grafted chitosan and / or modified high-sodium bentonite and prepared by electrospinning to achieve the effect of moisture permeability and breathability, so that the phase change temperature regulating microcapsules play a regulating role in the pores of the waterproof and breathable membrane of the outdoor clothing.

[0025] 5. To achieve intelligent temperature control based on changes in body temperature. Detailed Implementation

[0026] The technical solutions described below in conjunction with the embodiments of this application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that the phase change temperature-regulating microcapsules in this embodiment are PCM purchased from Forsmann with a phase change enthalpy ≥170 J / g. The modified high-sodium bentonite was purchased from Wuhu Shuohua New Materials Technology Co., Ltd., and its bulk density is 0.61 g / ml. All other materials are commercially available and will not be described in detail here.

[0028] The following will describe in detail the preparation method of the waterproof and breathable membrane for outdoor clothing of this application.

[0029] A method for preparing a waterproof and breathable membrane for outdoor clothing includes the following steps:

[0030] Step 1, Spinning solution preparation: The polymer resin and solvent are mixed and stirred to prepare the spinning solution. The solvent is N,N-dimethylformamide or N,N-dimethylacetamide and acetone in a volume ratio of 1:2.2-2.8, and the polymer accounts for 12-20% of the mass fraction of the spinning solution.

[0031] Step 2, electrospinning: The spinning solution prepared in Step 1 is introduced into the electrospinning machine. The DC spinning voltage of the electrospinning is controlled to be 12-25kV, the spinning solution injection speed is 1.0-2.4mL / h, and the receiving distance is 8-15cm. The waterproof and breathable membrane preform is obtained through the spinning process.

[0032] The polymer resin includes TPU or PU, maleic anhydride-grafted chitosan and / or modified sodium-based bentonite, and phase change temperature-regulating microcapsules, wherein the mass ratio of maleic anhydride-grafted chitosan and / or modified sodium-based bentonite to the polymer resin is 3-12%, and the mass ratio of phase change temperature-regulating microcapsules to the polymer resin is 20-42%.

[0033] It should be noted that the preparation method of maleic anhydride-grafted chitosan includes the following steps: Step ① Chitosan activation: Chitosan is dissolved in 1% glacial acetic acid solution to obtain a 2.5% (w / w) chitosan / glacial acetic acid solution; Step ② Grafting solution preparation: 2,3-diphenylmaleic anhydride is dissolved in acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; Step ③ Grafting reaction: The grafting solution is poured into the chitosan / glacial acetic acid solution, and after stirring for 3-5 hours, a grafting reaction solution is obtained; Step ④ Washing and discharging: Alkaline liquid is added to the grafting reaction solution, the pH is adjusted to 9 and a precipitate is obtained, and the precipitate is washed with ethanol / acetone and dried to obtain the finished maleic anhydride-grafted chitosan.

[0034] To improve the grafting reaction efficiency, in step ③, 0.025 g / ml of cerium ammonium nitrate was added to the chitosan / glacial acetic acid solution as a catalyst, and the reaction was controlled under an inert gas atmosphere at a temperature of 90°C. Simultaneously, during the grafting reaction, the molar ratio of chitosan in the chitosan / glacial acetic acid solution to 2,3-diphenylmaleic anhydride in the grafting solution was controlled to be 1:2.

[0035] In the embodiments of this application, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

[0036] It should be mentioned that, in order to improve the temperature regulation effect of the outdoor clothing waterproof and breathable membrane prepared by this method, the mass ratio of maleic anhydride grafted chitosan to modified sodium-based bentonite is 5:1-2.

[0037] Example 1

[0038] A method for preparing a waterproof and breathable membrane for outdoor clothing includes the following steps:

[0039] Step 1, Spinning solution preparation: The polymer resin and solvent are mixed and stirred to prepare the spinning solution. The solvent is N,N-dimethylformamide and acetone in a volume ratio of 1:2.2, and the polymer accounts for 12% of the mass fraction of the spinning solution.

[0040] Step 2, electrospinning: The spinning solution prepared in step 1 is introduced into the electrospinning machine. The DC spinning voltage of the electrospinning is controlled at 12kV, the spinning solution injection speed is 1.0mL / h, and the receiving distance is 8cm. The waterproof and breathable membrane preform is obtained through the spinning process.

[0041] The polymer resin includes TPU, maleic anhydride-grafted chitosan, and phase change temperature-regulating microcapsules, with maleic anhydride-grafted chitosan accounting for 3% of the polymer resin by mass and phase change temperature-regulating microcapsules accounting for 20% of the polymer resin by mass.

[0042] It should be noted that the preparation method of maleic anhydride-grafted chitosan includes the following steps: Step ① Chitosan activation: Chitosan is dissolved in 1% glacial acetic acid solution to obtain a 2.5% (w / w) chitosan / glacial acetic acid solution; Step ② Grafting solution preparation: 2,3-diphenylmaleic anhydride is dissolved in acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; Step ③ Grafting reaction: The grafting solution is poured into the chitosan / glacial acetic acid solution, and after stirring for 3 hours, a grafting reaction solution is obtained; Step ④ Washing and discharging: Alkaline liquid is added to the grafting reaction solution, the pH is adjusted to 9 and a precipitate is obtained, and the precipitate is washed with ethanol / acetone and dried to obtain the finished maleic anhydride-grafted chitosan.

[0043] To improve the grafting reaction efficiency, in step ③, 0.025 g / ml of cerium ammonium nitrate was added to the chitosan / glacial acetic acid solution as a catalyst, and the reaction was controlled under an inert gas atmosphere at a temperature of 90°C. Simultaneously, during the grafting reaction, the molar ratio of chitosan in the chitosan / glacial acetic acid solution to 2,3-diphenylmaleic anhydride in the grafting solution was controlled to be 1:2.

[0044] In the embodiments of this application, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

[0045] Example 2

[0046] A method for preparing a waterproof and breathable membrane for outdoor clothing includes the following steps:

[0047] Step 1, Spinning solution preparation: The polymer resin and solvent are mixed and stirred to prepare the spinning solution. The solvent is N,N-dimethylacetamide and acetone in a volume ratio of 1:2.5, and the polymer accounts for 15% of the mass fraction of the spinning solution.

[0048] Step 2, electrospinning: The spinning solution prepared in step 1 is introduced into the electrospinning machine. The DC spinning voltage of the electrospinning is controlled at 20kV, the spinning solution injection speed is 1.6mL / h, and the receiving distance is 12cm. The waterproof and breathable membrane preform is obtained through the spinning process.

[0049] The polymer resin includes TPU, maleic anhydride-grafted chitosan, modified high-sodium bentonite, and phase change temperature-regulating microcapsules. Maleic anhydride-grafted chitosan and modified high-sodium bentonite account for 6% of the polymer resin by mass, and phase change temperature-regulating microcapsules account for 30% of the polymer resin by mass.

[0050] It should be noted that the preparation method of maleic anhydride-grafted chitosan includes the following steps: Step ① Chitosan activation: Chitosan is dissolved in 1% glacial acetic acid solution to obtain a 2.5% (w / w) chitosan / glacial acetic acid solution; Step ② Grafting solution preparation: 2,3-diphenylmaleic anhydride is dissolved in acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; Step ③ Grafting reaction: The grafting solution is poured into the chitosan / glacial acetic acid solution, and after stirring for 4 hours, a grafting reaction solution is obtained; Step ④ Washing and discharging: Alkaline liquid is added to the grafting reaction solution, the pH is adjusted to 9 and a precipitate is obtained, and the precipitate is washed with ethanol / acetone and dried to obtain the finished maleic anhydride-grafted chitosan.

[0051] To improve the grafting reaction efficiency, in step ③, 0.025 g / ml of cerium ammonium nitrate was added to the chitosan / glacial acetic acid solution as a catalyst, and the reaction was controlled under an inert gas atmosphere at a temperature of 90°C. Simultaneously, during the grafting reaction, the molar ratio of chitosan in the chitosan / glacial acetic acid solution to 2,3-diphenylmaleic anhydride in the grafting solution was controlled to be 1:2.

[0052] In the embodiments of this application, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

[0053] It should be mentioned that, in order to improve the temperature regulation effect of the outdoor clothing waterproof and breathable membrane prepared by this method, the mass ratio of maleic anhydride grafted chitosan to modified sodium-based bentonite is 5:1.

[0054] Example 3

[0055] A method for preparing a waterproof and breathable membrane for outdoor clothing includes the following steps:

[0056] Step 1, Spinning solution preparation: The polymer resin and solvent are mixed and stirred to prepare the spinning solution. The solvent is N,N-dimethylformamide and acetone in a volume ratio of 1:2.8, and the polymer accounts for 20% of the mass fraction of the spinning solution.

[0057] Step 2, electrospinning: The spinning solution prepared in step 1 is introduced into the electrospinning machine. The DC spinning voltage of the electrospinning is controlled at 25kV, the spinning solution injection speed is 2.4mL / h, and the receiving distance is 15cm. The waterproof and breathable membrane preform is obtained through the spinning process.

[0058] The polymer resin includes PU, maleic anhydride-grafted chitosan, modified high-sodium bentonite, and phase change temperature-regulating microcapsules, wherein the mass ratio of maleic anhydride-grafted chitosan and modified high-sodium bentonite to the polymer resin is 12%, and the mass ratio of phase change temperature-regulating microcapsules to the polymer resin is 42%.

[0059] It should be noted that the preparation method of maleic anhydride-grafted chitosan includes the following steps: Step ① Chitosan activation: Chitosan is dissolved in 1% glacial acetic acid solution to obtain a 2.5% (w / w) chitosan / glacial acetic acid solution; Step ② Grafting solution preparation: 2,3-diphenylmaleic anhydride is dissolved in acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; Step ③ Grafting reaction: The grafting solution is poured into the chitosan / glacial acetic acid solution, and after stirring for 5 hours, a grafting reaction solution is obtained; Step ④ Washing and discharging: Alkaline liquid is added to the grafting reaction solution, the pH is adjusted to 9 and a precipitate is obtained, and the precipitate is washed with ethanol / acetone and dried to obtain the finished maleic anhydride-grafted chitosan.

[0060] To improve the grafting reaction efficiency, in step ③, 0.025 g / ml of cerium ammonium nitrate was added to the chitosan / glacial acetic acid solution as a catalyst, and the reaction was controlled under an inert gas atmosphere at a temperature of 90°C. Simultaneously, during the grafting reaction, the molar ratio of chitosan in the chitosan / glacial acetic acid solution to 2,3-diphenylmaleic anhydride in the grafting solution was controlled to be 1:2.

[0061] In the embodiments of this application, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

[0062] It should be mentioned that, in order to improve the temperature regulation effect of the outdoor clothing waterproof and breathable membrane prepared by this method, the mass ratio of maleic anhydride grafted chitosan to modified sodium-based bentonite is 5:2.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 2 is that the maleic anhydride-grafted chitosan in Comparative Example 1 is chitosan grafted with maleic anhydride, and the maleic anhydride is purchased from Jinan Huifengda Chemical Co., Ltd., and its CAS number is 108-31-6.

[0065] Comparative Example 2

[0066] The difference between Comparative Example 2 and Example 2 is that in Comparative Example 2, activated chitosan is used instead of maleic anhydride-grafted chitosan.

[0067] The difference between Comparative Example 3 and Example 2 is that maleic anhydride-grafted chitosan and modified high-sodium bentonite were not added in Comparative Example 3.

[0068] Performance testing:

[0069] 1. Hydrostatic pressure test: GB / T 4744-2013 "Test and evaluation of water resistance performance of textiles - hydrostatic pressure method"

[0070] 2. Moisture permeability test: GB / T 32614-2016 "Outdoor Sports Clothing - Waterproof Jackets"

[0071] 3. Phase transition enthalpy test: Differential scanning calorimetry (DSC)

[0072] The performance test results are shown in Tables 1 and 2 below.

[0073] Table 1. Performance Test Results of Examples and Comparative Examples

[0074]

[0075] Table 2. Performance Test Results of Examples and Comparative Examples

[0076] Phase transition enthalpy (J / g) Example 1 47 Example 2 58 Example 3 66 Comparative Example 1 50 Comparative Example 2 44 Comparative Example 3 35

[0077] As shown in Table 1 above, the synergistic effect of maleic anhydride-grafted chitosan and phase change temperature-regulating microcapsules in this embodiment effectively integrates with the phase change temperature-regulating microcapsules, thereby stimulating their temperature regulation capabilities to achieve effective temperature control. As shown in Table 2 above, increasing the amount of added phase change temperature-regulating microcapsules has a significant positive impact on the phase change enthalpy of the outdoor clothing waterproof and breathable membrane. However, as the amount of added phase change temperature-regulating microcapsules gradually increases, the increase in phase change enthalpy becomes less significant, affecting the waterproof and breathable properties of the material. Therefore, it is necessary to effectively control the amount of added phase change temperature-regulating microcapsules and ensure their synergistic effect with maleic anhydride-grafted chitosan and modified high-sodium bentonite to enhance the synergistic effect of each component in the spinning solution. Modified high-sodium bentonite improves adhesion and adsorption capacity, thereby promoting an increased contact angle to reduce hydrophilicity and waterproofness.

[0078] In summary, this application provides a method for preparing a waterproof and breathable membrane for outdoor clothing. This method combines maleic anhydride-grafted chitosan with phase change temperature-regulating microcapsules to improve the compatibility of the microcapsules in the polymer resin and ensure uniform dispersion within the resin, achieving efficient and intelligent temperature control. Specifically, the maleic anhydride-grafted chitosan obtained by grafting 2,3-diphenylmaleic anhydride with chitosan effectively compatibility with both the polymer resin and solvent, resulting in a uniformly dispersed spinning solution. Furthermore, when the phase change temperature-regulating microcapsules are mixed with the polymer resin and dispersed in the solvent, the combination of maleic anhydride-grafted chitosan and modified high-sodium bentonite significantly reduces the surface tension of the constituent materials, thereby effectively improving the hydrostatic protection capability of the waterproof and breathable membrane prepared by this method. Meanwhile, the waterproof and breathable membrane for outdoor clothing prepared using this method reduces body temperature fluctuations through the function of phase change temperature-regulating microcapsules, thereby avoiding harm to the human body caused by excessive temperature differences. Furthermore, by combining TPU or PU, maleic anhydride-grafted chitosan, and / or modified high-sodium bentonite with phase change temperature-regulating microcapsules via electrospinning, the membrane achieves excellent moisture permeability and breathability, allowing the phase change temperature-regulating microcapsules to regulate temperature within the pores of the membrane. Therefore, this method for preparing the waterproof and breathable membrane for outdoor clothing achieves intelligent temperature control based on body temperature changes.

[0079] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0080] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0081] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for preparing a waterproof and moisture-permeable membrane for outdoor clothing, characterized by, It comprises the following steps: Step 1, spinning solution configuration: mixing and stirring the polymer resin with the solvent to prepare a spinning solution; Step 2, electrospinning: introducing the spinning solution prepared in step 1 into an electrospinning machine to obtain a waterproof and moisture-permeable membrane embryo through a spinning process; The polymer resin comprises TPU or PU, maleic anhydride grafted chitosan, modified high-nano-based bentonite, and phase change temperature regulating microcapsules, and the mass ratio of the maleic anhydride grafted chitosan and the modified high-nano-based bentonite to the polymer resin is 3-12%, and the mass ratio of the phase change temperature regulating microcapsules to the polymer resin is 20-42%.

2. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 1, characterized in that: The preparation method of the maleic anhydride grafted chitosan comprises the following steps: ① chitosan activation: dissolving chitosan in a 1% acetic acid solution to obtain a 2.5% mass concentration chitosan / acetic acid solution; ② grafting solution configuration: dissolving 2,3-diphenyl maleic anhydride in an acetone solution to obtain a grafting solution with a concentration of 0.48 g / ml; ③ grafting reaction: pouring the grafting solution into the chitosan / acetic acid solution, stirring for 3-5 h to obtain a grafting reaction solution; ④ washing and discharging: adding an alkaline liquid to the grafting reaction solution, adjusting the pH to 9 to obtain a precipitate, and then sequentially washing and drying the precipitate to obtain the finished maleic anhydride grafted chitosan.

3. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 2, characterized in that: In step ③, 0.025 g / ml of cerium ammonium nitrate is added to the chitosan / acetic acid solution as a catalyst, and the reaction is controlled in an inert gas at a temperature of 90°C.

4. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 2, characterized in that: In step ③, the molar ratio of chitosan in the chitosan / acetic acid solution to 2,3-diphenyl maleic anhydride in the grafting solution is 1:

2.

5. The method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 2, characterized in that: In step ④, the alkaline liquid is a 1 mol / L sodium hydroxide solution.

6. The method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 1, characterized in that: The modified high-nano-based bentonite is purchased from Wuhu Shuohua New Material Technology Co., Ltd., and has a bulk density of 0.61 g / ml.

7. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 6, characterized in that: The mass ratio of the maleic anhydride grafted chitosan and the modified high-nano-based bentonite is 5:1-2.

8. The method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 1, characterized in that: The phase change temperature regulating microcapsules have a phase change enthalpy value of ≥170 J / g and are purchased from Fosman PCM.

9. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 1, characterized in that: In step 2, the direct current spinning voltage of the electrospinning is 12-25 kV, the spinning solution propelling infusion speed is 1.0-2.4 mL / h, and the receiving distance is 8-15 cm.

10. A method of making a waterproof and moisture-vapor-transmissive membrane for outdoor clothing according to claim 9, characterized in that: The solvent for the electrospinning is N,N-dimethylformamide or N,N-dimethylacetamide in a volume ratio of 1:2.2-2.8 to acetone, and the mass fraction of the polymer in the spinning solution is 12-20%.

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