Moisture-absorbing and perspiration-wicking cooling fabric and preparation method thereof

Abstract

This invention, belonging to the field of textile finishing technology, discloses a moisture-wicking, cooling fabric and its preparation method. The preparation method utilizes the bioaffinity, adhesion, hydrophilicity, and decomposition resistance of biofilms, along with their three-dimensional network structure and the high thermal conductivity of graphene. Furthermore, it leverages the heat pipe-like properties of hollow polyvinylidene fluoride (PVDF) nanofibers and the bioaffinity and adhesion of polydopamine to create a moisture-wicking, cooling fabric. The fabric rapidly absorbs sweat, simultaneously lowering skin surface temperature and allowing sweat to escape.

Description

Technical Field

[0001] The invention belongs to the technical field of textile finishing, and in particular relates to a moisture-absorbing and perspiration-releasing cooling fabric and a preparation method thereof. Background Art

[0002] Moisture-wicking fabrics are often called "quick-drying fabrics" or "breathable fabrics." Moisture-wicking fibers typically have a high surface area, numerous pores or grooves, and a unique cross-section. This capillary effect allows the fibers to quickly absorb moisture and sweat from the skin's surface and transfer them to the outer layers of the hair through diffusion.

[0003] The main technical features of moisture-wicking fabrics are in the following aspects. Special fiber design: Cool fabrics may use fibers with special cross-sectional shapes, such as special-shaped cross-sectional fibers. These fiber structures can increase the surface area, promote air circulation, and accelerate the evaporation of sweat, thereby taking away body surface heat. Some fibers contain microcapsules inside, which are wrapped with cooling ingredients. When the fabric contacts the skin, the microcapsules gradually break and release cooling substances, giving people a cool feeling. Moisture absorption and heat dissipation: Some cool fabrics work through the moisture absorption and sweat dissipation ability of the fiber itself. They can quickly absorb sweat from the skin surface and quickly diffuse it to the surface of the fabric, expanding the evaporation area, and using the latent heat exchange principle during water evaporation to take away a large amount of heat, thereby achieving the effect of lowering body temperature. Minerals or special additives: During the fiber production process, mineral powders or special chemicals with excellent thermal conductivity may be added. These ingredients can accelerate the conduction and dissipation of heat, allowing the fabric to take away heat faster when in contact with the skin. Finishing technologies: Through specialized finishing processes, such as the use of cooling agents, a coating or microcapsules that absorb and quickly release heat are added to the surface of the fabric without altering the original fabric properties, achieving an instantaneous cool sensation while maintaining good washability. Physically or chemically modified fibers: Modifying existing fibers using physical or chemical methods to enhance thermal conductivity and moisture absorption, or directly using new synthetic fibers that inherently possess cooling properties.

[0004] However, the summer clothing and fabrics currently available on the market generally have poor moisture absorption and perspiration removal effects, and the cooling effect is not obvious. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a moisture-absorbing and perspiration-releasing cooling fabric and a preparation method thereof, wherein the fabric can quickly absorb sweat, while lowering the skin surface temperature and discharging sweat.

[0006] In order to solve the above technical problems, the present invention provides a moisture-absorbing and perspiration-wicking cooling fabric and a preparation method thereof, comprising the following steps:

[0007] S1. Coaxially electrospinning a shell layer spinning solution and a core layer spinning solution to obtain a core-shell nanofiber membrane, immersing the core-shell nanofiber membrane in an aqueous solution containing a surfactant, washing it, drying it, and crushing it to obtain hollow PVDF nanofibers; the shell layer spinning solution is a PVDF solution, and the core layer spinning solution is a polyvinyl pyrrolidone solution;

[0008] S2. Preparation of biofilm: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking for 24-48 hours. Glass beads were then added and incubated for 20-24 hours. After filtration, the glass beads were poured into water and vortexed at high speed to obtain a biofilm suspension. The polysaccharide content of the biofilm suspension was 10-15 g / L.

[0009] S3. Fabric finishing: adding the hollow PVDF nanofibers and graphene to the biofilm suspension to obtain a finishing solution; using the finishing solution to finish the modal fabric, repeating the finishing process 3-5 times, and then immersing the fabric in a dopamine hydrochloride solution for treatment, taking it out, washing it with water, and drying it to obtain a moisture-absorbing and perspiration-wicking cooling fabric.

[0010] Furthermore, in step S1, the shell spinning solution is prepared by adding polyvinylidene fluoride (PVDF) into a mixed solvent of N,N-dimethylacetamide and acetone, wherein the weight average molecular weight of PVDF is 400,000-600,000 and the concentration of PVDF is 10-15 w / v%.

[0011] Furthermore, in step S1, the shell spinning solution is prepared by adding PVDF to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1, stirring until the PVDF is completely dissolved and evenly dispersed, and then standing to degas, thereby obtaining the shell spinning solution.

[0012] Furthermore, in step S1, the core layer spinning solution is prepared by dissolving polyvinyl pyrrolidone in anhydrous ethanol, the polyvinyl pyrrolidone is polyvinyl pyrrolidone PVPK90, and the concentration of polyvinyl pyrrolidone in the core layer spinning solution is 8-20 w / v%.

[0013] Furthermore, in step S1, the core layer spinning solution is prepared by dissolving polyvinyl pyrrolidone PVPK90 in anhydrous ethanol, stirring at 60° C. until completely dissolved, and standing to degas, thereby obtaining the core layer spinning solution.

[0014] Furthermore, in step S1, the coaxial electrospinning conditions are: voltage 20-25 kV, receiving distance 12-18 cm, shell layer spinning solution flow rate 0.5-0.7 ml / h, and core layer spinning solution flow rate 0.4-0.5 ml / h.

[0015] Furthermore, in step S1, the surfactant in the aqueous solution is one of Tween 80, rhamnolipid and sodium lauryl sulfate, and the concentration is 10-15 w / v%.

[0016] Furthermore, in step S1, the average length of the hollow PVDF nanofibers is 10-200 μm.

[0017] Furthermore, in step S2, the preparation process of the biofilm is as follows: Pseudomonas aeruginosa is inoculated into LB medium and cultured with shaking. After culturing for 24-48 hours, 5-10 w / v% sterile glass beads with a diameter of 4-6 mm are added, and then incubated for 20-24 hours. After filtering, the glass beads are poured into water, vortexed at high speed, and the glass beads are removed with a sieve to obtain a biofilm suspension.

[0018] Furthermore, in step S3, the finishing is specifically: applying the finishing liquid on the modal fabric, and drying at 120-140° C. to set the fabric.

[0019] Furthermore, in step S3, in the finishing liquid, the concentration of the hollow PVDF nanofibers is 1.0-1.5 w / v%, and the concentration of graphene is 0.1-0.5 w / v%.

[0020] Furthermore, in step S3, the amount of the finishing liquid is 50-80 ml / m 2 The dopamine hydrochloride solution has a pH of 9.5-10.0 and a concentration of 0.4-0.9 w / v%.

[0021] Furthermore, the immersion in the dopamine hydrochloride solution is performed for a treatment time of 20-50 minutes.

[0022] The present invention also provides a moisture-absorbing and perspiration-releasing cooling fabric prepared by the above-mentioned preparation method.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention utilizes the adhesion of biofilms to solid surfaces to bond graphene and hollow PVDF nanofibers to the surface of modal fabrics. At the same time, its main component, polysaccharides, are rich in hydroxyl groups, which can promote the synthesis and coverage of polydopamine. Biofilms mainly contain polysaccharides, which are inherently hydrophilic and hygroscopic. They also utilize their rich three-dimensional network structure to achieve capillary action, transporting water to the surface. Furthermore, the modified hollow PVDF nanofibers can absorb water from the biofilm on the surface, and then, through the heat transfer and heat pipe effect of graphene, draw this water into the hollow fibers and evaporate it to the outside, achieving an excellent cooling effect.

[0025] 2) The present invention adopts a biofilm, which can have strong resistance to stress and decomposition, which is very important for maintaining the function of the moisture-absorbing and perspiration-releasing cooling fabric after finishing and its washability and weather resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a scanning electron microscope photograph of the fabric prepared in Example 1. DETAILED DESCRIPTION

[0027] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than for limiting the claims of the present invention.

[0028] Example 1

[0029] A moisture-absorbing and perspiration-wicking cooling fabric and a preparation method thereof, comprising the following steps:

[0030] 1. Preparation of hollow PVDF nanofibers: PVDF with a weight-average molecular weight of 500,000 was added to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1 at 12w / v%, stirred until completely dissolved and evenly dispersed, and then allowed to stand for degassing to obtain the shell spinning solution; polyvinyl pyrrolidone PVPK90 was dissolved in anhydrous ethanol at 16w / v%, stirred until completely dissolved, and allowed to stand for degassing to obtain the core spinning solution. Coaxial electrospinning was performed using a voltage of 23kV, a receiving distance of 15cm, a shell spinning solution flow rate of 0.6ml / h, and a core spinning solution flow rate of 0.45ml / h to obtain a core-shell nanofiber membrane, which was then immersed in an aqueous solution containing 12w / v% rhamnolipid for washing, drying, and crushing to obtain hollow PVDF nanofibers with an average fiber length of 150μm.

[0031] 2. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking. After culturing for 36 h, 8 w / v% sterile 5 mm diameter glass beads were added and the culture was allowed to incubate for another 22 h. After filtration, the glass beads were poured into water and vortexed at high speed. The glass beads were removed with a sieve to obtain a biofilm suspension, resulting in a polysaccharide content of 14 g / L in the biofilm suspension.

[0032] 3. Fabric finishing: hollow PVDF nanofibers and graphene were added to the biofilm suspension to make the content of hollow PVDF nanofibers 1.2w / v% and the content of graphene 0.4w / v%, and coated on the modal fabric at a dosage of 65ml / m 2 , drying at 130℃ for setting, repeating the finishing process 4 times, and then immersing in a solution containing 0.6w / v% dopamine hydrochloride at pH 9.8, treating for 30 minutes, washing and drying to obtain a moisture-wicking and cool fabric ( Figure 1 ). Figure 1 It can be seen that the biofilm containing graphene is attached to the outside of the hollow nanofibers, forming a three-dimensional network structure with narrow gaps between the fibers, which may be conducive to the capillary action of water diffusion.

[0033] Example 2

[0034] A moisture-absorbing and perspiration-wicking cooling fabric and a preparation method thereof, comprising the following steps:

[0035] 1. Preparation of hollow PVDF nanofibers: PVDF with a weight-average molecular weight of 600,000 was added to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1 at 15 w / v%, stirred until completely dissolved and evenly dispersed, and then allowed to stand for degassing to obtain the shell spinning solution; polyvinyl pyrrolidone PVPK90 was dissolved in anhydrous ethanol at 20 w / v%, stirred until completely dissolved, and allowed to stand for degassing to obtain the core spinning solution. Coaxial electrospinning was performed using a voltage of 25 kV, a receiving distance of 18 cm, a shell spinning solution flow rate of 0.7 ml / h, and a core spinning solution flow rate of 0.5 ml / h to obtain a core-shell nanofiber membrane, which was then immersed in an aqueous solution containing 15 w / v% Tween 80 for washing, drying, and crushing to obtain hollow PVDF nanofibers with an average fiber length of 10 μm.

[0036] 2. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking. After 48 h of culture, 10 w / v% sterile 4 mm diameter glass beads were added. The culture was then incubated for another 24 h. After filtration, the glass beads were poured into water and vortexed at high speed. The glass beads were removed with a sieve to obtain a biofilm suspension, resulting in a polysaccharide content of 15 g / L in the biofilm suspension.

[0037] 3. Fabric finishing: hollow PVDF nanofibers and graphene were added to the biofilm suspension to make the content of hollow PVDF nanofibers 1.5w / v% and the content of graphene 0.5w / v%, and coated on the modal fabric at a dosage of 80ml / m 2 , drying at 140℃ for setting, repeating the finishing process 5 times, and then immersing in a solution containing 0.9w / v% dopamine hydrochloride at pH 10. After treatment for 50 minutes, washing and drying, the moisture-absorbing and perspiration-wicking cooling fabric is obtained.

[0038] Example 3

[0039] A moisture-absorbing and perspiration-wicking cooling fabric and a preparation method thereof, comprising the following steps:

[0040] 1. Preparation of hollow PVDF nanofibers: PVDF with a weight-average molecular weight of 400,000 was added to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1 at 10 w / v%, stirred until completely dissolved and evenly dispersed, and then allowed to stand for degassing to obtain the shell spinning solution; polyvinyl pyrrolidone PVPK90 was dissolved in anhydrous ethanol at 8 w / v%, stirred until completely dissolved, and allowed to stand for degassing to obtain the core spinning solution. Coaxial electrospinning was performed using a voltage of 20 kV, a receiving distance of 12 cm, a shell spinning solution flow rate of 0.5 ml / h, and a core spinning solution flow rate of 0.4 ml / h to obtain a core-shell nanofiber membrane, which was then immersed in an aqueous solution containing 10 w / v% sodium dodecyl sulfate for washing, drying, and crushing to obtain hollow PVDF nanofibers with an average fiber length of 200 μm.

[0041] 2. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking. After culturing for 24 h, 5 w / v% sterile 6 mm diameter glass beads were added and the culture was allowed to incubate for another 20 h. After filtration, the glass beads were poured into water and vortexed at high speed. The glass beads were removed with a sieve to obtain a biofilm suspension, so that the polysaccharide content in the biofilm suspension was 10 g / L.

[0042] 3. Fabric finishing: hollow PVDF nanofibers and graphene were added to the biofilm suspension to make the content of hollow PVDF nanofibers 1.0 w / v% and the content of graphene 0.1 w / v%, and coated on the modal fabric at a dosage of 50 ml / m 2 , drying at 120℃ for setting, repeating the finishing process 3 times, and then immersing in a solution containing 0.4w / v% dopamine hydrochloride at pH 9.5. After treatment for 20 minutes, washing and drying to obtain a moisture-absorbing and perspiration-wicking cool fabric.

[0043] Comparative Example 1 (without hollow PVDF nanofibers)

[0044] A fabric and a preparation method thereof, comprising the following steps:

[0045] 1. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking. After culturing for 36 h, 8 w / v% sterile 5 mm diameter glass beads were added. The culture was then incubated for another 22 h. After filtration, the glass beads were poured into water and vortexed at high speed. The glass beads were removed with a sieve to obtain a biofilm suspension. The polysaccharide content of the biofilm suspension was 14 g / L.

[0046] 2. Fabric finishing: Add graphene to the biofilm suspension to make the graphene content 0.4w / v%, and apply it on the modal fabric at a dosage of 65ml / m 2, drying and shaping at 130℃, repeating the finishing process 4 times, and then immersing in a solution containing 0.6w / v% dopamine hydrochloride at pH 9.8, treating for 30 minutes, washing and drying to obtain the fabric.

[0047] Comparative Example 2 (no biofilm)

[0048] A fabric and a preparation method thereof, comprising the following steps:

[0049] 1. Preparation of hollow PVDF nanofibers: PVDF with a weight-average molecular weight of 500,000 was added to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1 at 12w / v%, stirred until completely dissolved and evenly dispersed, and then allowed to stand for degassing to obtain the shell spinning solution; polyvinyl pyrrolidone PVPK90 was dissolved in anhydrous ethanol at 16w / v%, stirred until completely dissolved, and allowed to stand for degassing to obtain the core spinning solution. Coaxial electrospinning was performed using a voltage of 23kV, a receiving distance of 15cm, a shell spinning solution flow rate of 0.6ml / h, and a core spinning solution flow rate of 0.45ml / h to obtain a core-shell nanofiber membrane, which was then immersed in an aqueous solution containing 12w / v% rhamnolipid for washing, drying, and pulverizing to obtain hollow PVDF nanofibers with an average fiber length of 150μm.

[0050] 2. Fabric finishing: hollow PVDF nanofibers and graphene were added to water to make the content of hollow PVDF nanofibers 1.2w / v% and the content of graphene 0.4w / v%, and coated on modal fabric at a dosage of 65ml / m 2 , drying and shaping at 130℃, repeating the finishing process 4 times, and then immersing in a solution containing 0.6w / v% dopamine hydrochloride at pH 9.8, treating for 30 minutes, washing and drying to obtain the fabric.

[0051] Comparative Example 3 (without graphene)

[0052] A fabric and a preparation method thereof, comprising the following steps:

[0053] 1. Preparation of hollow PVDF nanofibers: PVDF with a weight-average molecular weight of 500,000 was added to a mixed solvent of N,N-dimethylacetamide and acetone in a ratio of 1:1 at 12w / v%, stirred until completely dissolved and evenly dispersed, and then allowed to stand for degassing to obtain the shell spinning solution; polyvinyl pyrrolidone PVPK90 was dissolved in anhydrous ethanol at 16w / v%, stirred until completely dissolved, and allowed to stand for degassing to obtain the core spinning solution. Coaxial electrospinning was performed using a voltage of 23kV, a receiving distance of 15cm, a shell spinning solution flow rate of 0.6ml / h, and a core spinning solution flow rate of 0.45ml / h to obtain a core-shell nanofiber membrane, which was then immersed in an aqueous solution containing 12w / v% rhamnolipid for washing, drying, and pulverizing to obtain hollow PVDF nanofibers with an average fiber length of 150μm.

[0054] 2. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking. After culturing for 36 h, 8 w / v% sterile 5 mm diameter glass beads were added and the culture was allowed to incubate for another 22 h. After filtration, the glass beads were poured into water and vortexed at high speed. The glass beads were removed with a sieve to obtain a biofilm suspension, resulting in a polysaccharide content of 14 g / L in the biofilm suspension.

[0055] 3. Fabric finishing: hollow PVDF nanofibers were added to the biofilm suspension to make the content of hollow PVDF nanofibers 1.2w / v%, and coated on the modal fabric at a dosage of 65ml / m 2 , drying and shaping at 130℃, repeating the finishing process 4 times, and then immersing in a solution containing 0.6w / v% dopamine hydrochloride at pH 9.8, treating for 30 minutes, washing and drying to obtain the fabric.

[0056] Moisture absorption and quick drying test

[0057] According to the national standard GB / T21655.1-2008 "Evaluation of Moisture Absorption and Quick-drying Properties of Textiles Part 1: Single Item Combined Test Method", the test was carried out under the conditions of humidity 60%, temperature 20°C, and standard atmospheric pressure. The moisture absorption properties of the fabrics of Examples 1-3 and Comparative Examples 1-3 and the modal fabric were evaluated by water absorption rate and drip diffusion time; the quick-drying properties of each sample fabric were evaluated by evaporation rate. The results are shown in Table 1.

[0058] Table 1 Test results of moisture absorption and quick drying of fabrics

[0059] sample Water absorption / % Droplet diffusion time / s 40-minute residual water rate / % Water evaporation rate / (g / h) Modal fabric 207 2.5 25 0.10 Example 1 358 0.5 4 2.66 Example 2 347 0.7 6 2.51 Example 3 353 0.7 5 2.34 Comparative Example 1 249 2.3 22 0.14 Comparative Example 2 210 2.2 17 0.17 Comparative Example 3 298 2.0 20 0.13

[0060] As shown in Table 1, the hygroscopicity and quick-drying properties of the fabrics prepared in the Examples met the standard requirements, demonstrating excellent hygroscopic and quick-drying performance. After 40 minutes of drying, the total residual water content of the fabrics was less than the standard-approved 13%, and the evaporation rate was greater than the standard-approved 0.18 g / h. In contrast, the base modal fabric and the fabric prepared in the comparative example, while achieving the standard-approved water absorption rate of 200% and the droplet diffusion time of 3 seconds, exhibited poor quick-drying properties. The fabrics in the examples exhibited superior quick-drying properties due to their finishing and surface structure. The polydopamine and biofilm on the surface have strong hygroscopic properties, which then transfers heat through graphene, while the hollow PVDF nanofibers absorb heat and control evaporation. This facilitates the transfer of small amounts of internal moisture to the outer surface, thereby increasing the evaporation area and speeding up the evaporation rate. The fabric prepared in Comparative Example 1 lacks hollow PVDF nanofibers, which compromise the three-dimensional mesh structure of the fabric surface, reducing the fabric's hygroscopicity and impacting the heat pipe effect and evaporation of moisture. Comparative Example 2 lacks a biofilm, which directly affects the three-dimensional network structure of the fabric surface, reducing the fabric's water absorption, leaving it only close to that of the base fabric. Furthermore, the strong hydrophobicity of the hollow PVDF nanofibers and graphene can affect the synthesis of polydopamine on their surfaces, as well as its affinity for skin and water absorption. Comparative Example 3 lacks graphene, which is a lamellar structure and an important component of the three-dimensional network structure on the fabric surface of the present invention. Its absence can lead to defects in the three-dimensional network structure, reduce water absorption, and affect the thermal conductivity of the fabric surface, limiting water evaporation.

[0061] Cooling performance test

[0062] The cooling properties of the fabrics of Examples 1-3 and Comparative Examples 1-3 and Modal fabrics were tested with reference to GB / T35263-2017 "Test and Evaluation of Instant Cooling Properties of Textiles". The test method for instant cooling is as follows: the fabric sample is placed between the cold plate (20±0.5℃ below) and the hot plate (35±0.5℃ above). The polyethylene surface contacts the hot plate with a layer of water film (simulating human skin). The highest value is reached about 0.2s after the contact moment, and the entire test is completed within 10s. The test hot plate area is 9cm 2 The temperature difference between the cold and hot plates is 15℃. The instantaneous coolness of the fabric is tested on the fabric coolness tester. The heat flow transfer test is carried out to test the fabric contact temperature and coolness, that is, the instantaneous coolness value q max (W / cm 2 ), the test results are shown in Table 2.

[0063] Table 2 Test results of instant cool feeling of fabrics

[0064] sample <![CDATA[Instantaneous cool feeling value q max (W / cm 2 )]]> Modal fabric 0.14 Example 1 0.218 Example 2 0.214 Example 3 0.209 Comparative Example 1 0.168 Comparative Example 2 0.172 Comparative Example 3 0.154

[0065] As can be seen from Table 2, the fabrics prepared in the examples have a good cooling effect, while the fabrics prepared in the comparative examples are inferior to them. The cooling effect of the fabrics in the examples comes from the latent heat carried away by water evaporation and the rapid heat transfer to the outside by heat conduction such as graphene. The fabric prepared in comparative example 1 does not have hollow PVDF nanofibers, which affects the heat pipe effect and the evaporation and discharge of water, so the cooling effect is not good. Comparative example 2 does not have a biofilm, which directly affects the three-dimensional network structure on the surface of the fabric and reduces the water absorption of the fabric. Water evaporation is required to carry away the latent heat, and the lack of water retention of the biofilm will result in a poor cooling effect. Comparative example 3 does not have graphene. Graphene is a lamellar structure and is an important component of the three-dimensional network structure on the surface of the fabric in the examples of the present invention. The lack of it will lead to defects in the three-dimensional network structure, reduce water absorption, and affect the thermal conductivity of the fabric surface, limit the evaporation of water, and significantly reduce the cooling performance.

[0066] The present invention provides a moisture-wicking, cooling fabric and its preparation method. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention. Such improvements and modifications are also within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A method for preparing a moisture-absorbing and perspiration-wicking cooling fabric, characterized in that: The preparation method comprises the following steps: S1. Coaxially electrospinning a shell layer spinning solution and a core layer spinning solution to obtain a core-shell nanofiber membrane, immersing the core-shell nanofiber membrane in an aqueous solution containing a surfactant, washing it, drying it, and crushing it to obtain hollow PVDF nanofibers; the shell layer spinning solution is a polyvinylidene fluoride solution, and the core layer spinning solution is a polyvinyl pyrrolidone solution; S2. Biofilm Preparation: Pseudomonas aeruginosa was inoculated into LB medium and cultured with shaking for 24-48 hours. Glass beads were then added and incubated for another 20-24 hours. After filtration, the glass beads were poured into water and vortexed to remove the beads to obtain a biofilm suspension. S3. Fabric finishing: adding the hollow PVDF nanofibers and graphene to the biofilm suspension to obtain a finishing solution; using the finishing solution to finish the modal fabric, repeating the finishing process 3-5 times, and then immersing the fabric in a dopamine hydrochloride solution for treatment, taking it out, washing it with water, and drying it to obtain a moisture-absorbing and perspiration-wicking cooling fabric.

2. The preparation method according to claim 1, characterized in that In step S1, the shell spinning solution is prepared by adding polyvinylidene fluoride into a mixed solvent of N,N-dimethylacetamide and acetone, wherein the weight average molecular weight of the polyvinylidene fluoride is 400,000-600,000 and the concentration of the polyvinylidene fluoride is 10-15 w / v%.

3. The preparation method according to claim 1, characterized in that In step S1, the core layer spinning solution is prepared by dissolving polyvinyl pyrrolidone in anhydrous ethanol, the polyvinyl pyrrolidone is polyvinyl pyrrolidone PVPK90, and the concentration of polyvinyl pyrrolidone in the core layer spinning solution is 8-20 w / v%.

4. The preparation method according to claim 1, characterized in that In step S1, the coaxial electrospinning conditions are as follows: voltage 20-25 kV, receiving distance 12-18 cm, shell layer spinning solution flow rate 0.5-0.7 ml / h, and core layer spinning solution flow rate 0.4-0.5 ml / h.

5. The preparation method according to claim 1, characterized in that In step S1, in the aqueous solution containing a surfactant, the surfactant is one of Tween 80, rhamnolipid and sodium lauryl sulfate, and the concentration is 10-15 w / v%.

6. The preparation method according to claim 1, characterized in that In step S1, the average length of the hollow PVDF nanofibers is 10-200 μm.

7. The preparation method according to claim 1, characterized in that In step S3, the finishing step specifically includes: applying the finishing liquid on the modal fabric, and drying at 120-140° C. to set the fabric.

8. The preparation method according to claim 1, characterized in that In step S3, in the finishing liquid, the concentration of the hollow PVDF nanofibers is 1.0-1.5 w / v%, and the concentration of graphene is 0.1-0.5 w / v%.

9. The preparation method according to claim 8, characterized in that In step S3, the amount of the finishing liquid is 50-80 ml / m 2 ; The dopamine hydrochloride solution has a pH of 9.5-10.0 and a concentration of 0.4-0.9 w / v%.

10. A moisture-absorbing and perspiration-releasing cooling fabric prepared by the preparation method according to any one of claims 1 to 9.

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