Multiscale interconnected moisture-wicking core spun yarn and method of making same

Abstract

The application provides a multi-scale interconnected moisture absorption and perspiration core yarn and a preparation method thereof, and belongs to the technical field of textile materials, and aims to solve the technical problem of poor moisture absorption, moisture conduction and water transmission capacity of moisture absorption and perspiration textiles.The core yarn comprises a fiber wrapping layer and a core fiber layer; the fibers in the fiber wrapping layer are nanofibers, the nanofibers are hollow structures, have grooves on the surfaces and have holes on the fiber walls; and the fibers in the core fiber layer are profiled fibers with grooves on the surfaces.The application combines the functional design of the yarn structure by means of the profiled fiber, a differentiated synthetic fiber, constructs multi-stage pores and groove structures on the surface of the profiled fiber, and prepares a new functional moisture absorption and perspiration yarn with a micro multi-stage pore structure, so that the delamination problem of the multi-layer pore structure film is solved, the yarn itself has a wetting gradient difference effect, the moisture absorption, moisture conduction and water transmission speed are accelerated, and the service life of the moisture absorption and perspiration product is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile materials, and particularly relates to a multi-scale interconnected moisture absorption and perspiration core yarn and a preparation method thereof. BACKGROUND

[0002] With the development of society and the improvement of living quality, people's requirements for ecological functional textiles are increasing, including the requirement for the comfort of textiles. According to the current textile technology, the contact comfort and pressure comfort can be basically solved in the post-processing of textiles, and the solution to the thermal and moisture comfort is generally achieved by using differential synthetic fibers or constructing a multi-layer fabric composite structure to form a wetting gradient difference effect. How to realize the new construction of moisture absorption and perspiration textile products by means of new raw materials, new equipment and new process has become a new research direction. Some scholars currently propose to construct a multi-layer porous structure film to form a wetting gradient difference effect by means of bionics principle. For example, patent publication No. CN113186730A discloses a one-way moisture guiding material and its preparation method and application. The one-way moisture guiding material includes a base layer and a hydrophilic fiber film. The average pore size of the base layer is larger than that of the hydrophilic outer layer fiber film, forming a pore size gradient effect, which is conducive to the conduction of water. However, such a multi-layer structure is prone to delamination and other problems in actual application. Therefore, patent publication No. CN111663216A discloses a moisture guiding and quick drying composite yarn, its preparation method and fabric. The composite yarn is obtained by compounding micro-nano fibers and cotton fibers. The composition of the micro-nano fibers is acrylic modified cellulose acetate. The mass percentage of the micro-nano fibers in the composite yarn is 8-10%. The sweat is quickly guided out and evaporated through the differential capillary effect in the yarn. However, due to the single structure of the yarn, the moisture absorption and moisture guiding capacity of the yarn is limited. SUMMARY

[0003] In view of the technical problem of poor moisture absorption, moisture guiding and water transmission capacity of moisture absorption and perspiration textiles, the present application provides a multi-scale interconnected moisture absorption and perspiration core yarn and a preparation method thereof. By means of the differential synthetic fiber of profiled fiber and the functional design of yarn structure, multi-stage pores and groove structures are constructed on the surface of the profiled fiber to form a new functional moisture absorption and perspiration yarn with micro multi-stage pore structure, solve the delamination problem of multi-layer porous structure film, and make the yarn itself have a wetting gradient difference effect, accelerate the speed of moisture absorption, moisture guiding and water transmission, and prolong the service life of moisture absorption and perspiration products.

[0004] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0005] A multi-scale interconnected moisture-wicking and sweat-releasing core-spun yarn comprises a fiber wrapping layer and a core fiber layer; the fibers in the fiber wrapping layer are nanofibers, the nanofibers are hollow structures, have grooves on the surface and have holes on the fiber wall; the fibers in the core fiber layer are profiled fibers having grooves on the surface.

[0006] The core fiber layer adopts moisture-wicking and sweat-releasing profiled fibers with a cross-section, and the fiber surface has a four-groove structure, so that adjacent fibers are easy to approach, quickly absorb, transport, diffuse and evaporate water, and keep the microenvironment between the skin and the fabric comfortable, and the profiled fibers have stable moisture-wicking and sweat-releasing performance. The porous and hydrophilic nanopoly-lactic acid fiber wrapping layer has the characteristics of multi-scale interconnection, high porosity and liquid permeability, and the multi-scale interconnection is reflected in the groove structure formed on the surface of the nanofiber of the wrapping layer, the porous structure on the surface of the nanopoly-lactic acid fiber of the wrapping layer, the partial hollow structure of the nanopoly-lactic acid fiber of the wrapping layer, the pore structure between the nanopoly-lactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking and sweat-releasing profiled fiber of the core fiber layer and the hydrophilic finishing layer on the outer surface of the core-spun yarn.

[0007] A preparation method of a multi-scale interconnected moisture-wicking and sweat-releasing core-spun yarn, which adopts a device for preparing electrospun nanofiber core-spun yarn to prepare the multi-scale interconnected moisture-wicking and sweat-releasing core-spun yarn. The device for preparing electrospun nanofiber core-spun yarn comprises a coaxial electrospinning machine, and the preparation method comprises the following steps: (1) dissolving and configuring a polymer and a pore-forming agent to prepare a sheath layer spinning solution; (2) dissolving and configuring a water-soluble polymer to prepare a core layer spinning solution; (3) preparing nanofibers with a sheath-core structure by the coaxial electrospinning machine through the sheath layer spinning solution and the core layer spinning solution, and wrapping the nanofibers on the core fiber layer; and (4) washing the core-spun yarn prepared in step (3) to remove the water-soluble polymer, thereby obtaining the multi-scale interconnected moisture-wicking and sweat-releasing core-spun yarn.

[0008] The addition amount of the pore-forming agent is 1-3% of the mass of the polymer; the pore-forming agent is volatile oil or a substance containing volatile oil; the volatile oil is 4-terpineol or dodecanal; and the substance containing volatile oil is radix bupleuri.

[0009] The concentration of the polymer in the sheath layer spinning solution is 5-15 wt%.

[0010] The polymer is polylactic acid or polyacrylonitrile, and the solvent of the sheath layer spinning solution is one or two or more of hexafluoroisopropanol, trichloromethane or acetone.

[0011] The concentration of the water-soluble polymer in the core layer spinning solution is 5-15 wt%.

[0012] The water-soluble polymer is polyvinyl alcohol or polyvinylpyrrolidone, and the solvent in the core layer spinning solution is water.

[0013] The profiled fiber is a fiber with a cross-section.

[0014] The core-spun yarn prepared in step (4) is subjected to hydrophilic finishing by using a hydrophilic finishing agent, and the steps are as follows: a solution of the hydrophilic finishing agent with a concentration of 5-10 wt% is prepared, and then the solution is sprayed on the core-spun yarn to form a hydrophilic finishing layer on the surface, wherein the hydrophilic finishing agent is a hydrophilic finishing agent containing a modified polysiloxane surfactant component.

[0015] The device for preparing the electrospun nanofiber core-spun yarn is a coaxial conjugate electrospinning device, and the coaxial conjugate electrospinning device further comprises a twisting device, an unwinding device and a winding device, and is provided with two coaxial electrospinning machines and is symmetrically arranged; the technical parameters for preparing the multi-scale interconnected moisture-wicking core-spun yarn by using the coaxial conjugate electrospinning device are as follows: a voltage of 10-27 kv, a spinning speed of 1-3 mL / h, a distance between two needles of 20-35 cm, a receiving distance of 20-35 cm, a winding device rotating speed of 2-5 r / min and a twisting device rotating speed of 300-400 r / min.

[0016] The beneficial effects of the present application are as follows:

[0017] (1) The multi-scale interconnection of the present application refers to the groove structure formed on the surface of the nanofiber of the wrapping layer, the porous structure on the surface of the nanofiber of the wrapping layer, the partial hollow structure of the nanofiber of the wrapping layer, the pore structure between the nanofiber aggregates, the recess structure on the surface of the cross-shaped moisture-wicking profiled fiber of the core-spun yarn layer and the hydrophilic finishing layer on the outer surface of the core-spun yarn, etc., so that the core-spun yarn has high moisture absorption, moisture conduction and water transmission performance, realizes rapid water conduction, improves the microenvironment between the human skin and the fabric and promotes the improvement of comfort.

[0018] (2) The cross-shaped moisture-wicking profiled fiber selected in the present application has four recess structures on the surface, so that the adjacent fibers are easy to approach each other to form many small capillary channels with strong capillary effect, has the function of rapidly discharging sweat to the surface of the fabric, and has rapid water absorption, water transmission, diffusion and evaporation, thereby maintaining the comfort of the microenvironment between the skin and the fabric. The specific surface area of the cross-shaped profiled fiber is 19.8% larger than that of the common circular cross-section fiber with the same fineness, and the capillary principle is utilized to enable the fiber to rapidly absorb water, transmit water, diffuse and evaporate, so that after the sweat is discharged to the surface of the fabric, the sweat can be rapidly evaporated into the surrounding atmosphere, and the water loss rate of the cross-shaped profiled fiber is almost 100% in 30 min, while the water loss rate of cotton fiber is only about 50%, and the water loss rate of acrylic fiber is 85%. The clothes made of the cross-shaped profiled fiber can keep the skin dry and comfortable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and are not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0020] Figure 1 For Figure 2 For the schematic diagram of coaxial conjugate electrospinning device, in the figure, 1 is a coaxial electrospinning machine, 2 is a syringe pump, 3 is a coaxial needle, 4 is a twisting device, 5 is an unwinding device, 6 is a winding device, and 7 is a core yarn.

[0021] Figure 2 For the schematic diagram of multi-scale interconnected moisture-wicking core-spun yarn structure.

[0022] Figure 3 For the scanning electron microscope image of the cross section of the moisture-wicking core-spun yarn.

[0023] Figure 4 For the scanning electron microscope image of the cross section of the nano polylactic acid fiber.

[0024] Figure 5 For the scanning electron microscope image of the surface of the nano polylactic acid fiber.

[0025] Figure 6 For the actual picture of the multi-scale interconnected moisture-wicking fabric.

[0026] Figure 7 For the data chart of the wicking height test of the moisture-wicking core-spun yarn.

[0027] Figure 8 For the actual picture of the water drop diffusion test of the moisture-wicking fabric.

[0028] Figure 9 For the data chart of the water drop diffusion test of the moisture-wicking fabric.

[0029] Figure 10 For the data chart of the air permeability test of the moisture-wicking fabric.

[0030] Figure 11 For the data chart of the mechanical property test of the moisture-wicking core-spun yarn. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0032] The coaxial conjugate electrospinning device structure used in the following examples for preparing moisture-wicking yarn is shown in Figure 1 The coaxial electrospinning machine 1 includes an injection pump 2 and a coaxial needle 3, the coaxial needle 3 is connected with a high-voltage direct current power supply, and a voltage difference (spinning voltage) is formed between the coaxial needle 3 and the metal funnel, and the spinning jet at the coaxial needle 3 is received by the metal funnel after being drawn. The core yarn 7 is wound on the unwinding device 5 and fixed on the winding device 6 through the axis of the metal funnel. The moisture-wicking yarn of the present application can also be prepared by using a device for preparing core-spun yarn combined with an electrospinning machine, such as the devices for preparing electrospun nanofiber core-spun yarn disclosed in patents CN109554794A, CN109355715A, CN104032423A, etc. The difference lies in that the electrospinning machine is replaced by a coaxial electrospinning machine.

[0033] Example 1

[0034] A multi-scale interconnected moisture-wicking core-spun yarn, as shown in Figure 2 The moisture-wicking yarn of the present application can also be prepared by using a device for preparing core-spun yarn combined with an electrospinning machine, such as the devices for preparing electrospun nanofiber core-spun yarn disclosed in patents CN109554794A, CN109355715A, CN104032423A, etc. The difference lies in that the electrospinning machine is replaced by a coaxial electrospinning machine.

[0035] Preparation method:

[0036] (1) Prepare a polylactic acid spinning solution: Before preparation, dry the polylactic acid at 60°C for 30 min in a constant temperature vacuum dryer, select trichloromethane and acetone as solvents, the ratio of the two is 8:1, 60°C constant temperature magnetic stirring for 2h, mix evenly, prepare a polylactic acid spinning stock solution with a mass fraction of 9%; add 2% dodecanal relative to the mass of polylactic acid in the spinning stock solution, constant temperature magnetic stirring for 45 min until evenly mixed, get a homogeneous distribution of spinning solution.

[0037] (2) Prepare a polyvinyl alcohol solution: Add polyvinyl alcohol (type 17-88) to deionized water, 40°C constant temperature magnetic stirring for 3h, defoaming for 4h, get a polyvinyl alcohol solution with a mass fraction of 9%.

[0038] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 19±2kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 2mL / h, the distance between two needles is 26cm, the distance between needle and collecting roller is about 30cm, the winding speed is 3r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-in-sheath yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0039] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of the nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-in-sheath yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0040] Example 2

[0041] A multi-scale interconnected moisture-wicking core-in-sheath yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-in-sheath yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0042] Preparation method:

[0043] (1) Prepare polylactic acid spinning solution: dry polylactic acid at 60℃ for 30min in a constant temperature vacuum dryer, select trichloromethane and acetone as solvents, the ratio of the two is 8:1, 60℃ constant temperature magnetic stirring for 2h, mix uniformly, prepare 9% polylactic acid spinning stock solution; add 2% dodecanal relative to the mass of polylactic acid in the spinning stock solution, constant temperature magnetic stirring for 45min until uniformly mixed to obtain a homogeneous distribution of spinning solution.

[0044] (2) Prepare polyvinyl alcohol solution: add polyvinyl alcohol (type 17-88) to deionized water, 40℃ constant temperature magnetic stirring for 3h, stand for 4h to defoam, obtain 9% polyvinyl alcohol solution.

[0045] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 19±2kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 2mL / h, the distance between two needles is 24cm, the distance between needle and collecting roller is about 32cm, the winding speed is 5r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of the United States DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0046] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of the nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0047] Example 3

[0048] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0049] Preparation method:

[0050] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h to prepare a polylactic acid spinning solution with a mass fraction of 9%; 2% dodecanal is added to the polylactic acid spinning solution, and the mixture is uniformly stirred at room temperature for 45min to obtain a homogeneous distribution of the spinning solution.

[0051] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40℃ for 3h, and then is left to stand for 4h to remove bubbles, to obtain a polyvinyl alcohol solution with a mass fraction of 9%.

[0052] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 25kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 25cm, the distance between needle and collecting roller is about 30cm, the winding speed is 4r / min, the twisting speed of horn mouth is 350r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0053] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of the nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0054] Example 4

[0055] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0056] Preparation method:

[0057] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h to obtain a polylactic acid spinning solution with a mass fraction of 9%; 2% of radix bupleuri is added to the polylactic acid spinning solution, and the mixture is uniformly stirred at 60℃ for 45min to obtain a homogeneous distribution spinning solution.

[0058] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is uniformly stirred at 40℃ for 3h, and then is left to stand for 4h to remove bubbles, so as to obtain a polyvinyl alcohol solution with a mass fraction of 9%.

[0059] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 22G / 18G, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 24cm, the distance between needle and collecting roller is about 32cm, the winding speed is 4r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0060] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, which makes the surface of nanometer polylactic acid fiber present a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0061] Example 5

[0062] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0063] Preparation method:

[0064] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h to prepare polylactic acid spinning solution with a mass fraction of 9%; 2% of radix bupleuri is added to the polylactic acid spinning solution, and the mixture is uniformly stirred at 60℃ for 45min to obtain a homogeneous distribution of the spinning solution.

[0065] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40℃ for 3h, and then is left to stand for 4h to remove bubbles, to obtain polyvinyl alcohol solution with a mass fraction of 9%.

[0066] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 24cm, the distance between needle and collecting roller is about 30cm, the winding speed is 3r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0067] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, which makes the surface of nanometer polylactic acid fiber present a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0068] Example 6

[0069] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0070] Preparation method:

[0071] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h to prepare polylactic acid spinning solution with a mass fraction of 9%; 2% of radix bupleuri is added to the polylactic acid spinning solution, and the mixture is uniformly stirred at 60℃ for 45min to obtain a homogeneous distribution of the spinning solution.

[0072] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40℃ for 3h, and then is left to stand for 4h to remove bubbles, to obtain polyvinyl alcohol solution with a mass fraction of 9%.

[0073] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 24cm, the distance between needle and collecting roller is about 32cm, the winding speed is 3r / min, the twisting speed of horn mouth is 400r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0074] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of the nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0075] Example 7

[0076] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0077] Preparation method:

[0078] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h by a magnetic stirrer to prepare a polylactic acid spinning solution with a mass fraction of 5%; 3% dodecanal is added to the polylactic acid spinning solution, and the mixture is uniformly stirred at room temperature for 45min by a magnetic stirrer to obtain a homogeneous distribution of the spinning solution.

[0079] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40℃ for 3h by a magnetic stirrer, and then is left to stand for 4h to remove bubbles, so as to obtain a polyvinyl alcohol solution with a mass fraction of 15%.

[0080] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 1030kv, the pushing speed of polylactic acid spinning solution is 1mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 30cm, the distance between needle and collecting roller is about 35cm, the winding speed is 3r / min, the twisting speed of horn mouth is 400r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0081] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of the nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0082] Example 8

[0083] A multi-scale interconnected moisture-wicking core-spun yarn is composed of a porous hydrophilic nanometer polylactic acid fiber wrapping layer and a moisture-wicking shaped fiber core fiber layer, wherein the groove structure formed on the surface of the wrapping layer nanofiber, the porous structure on the surface of the wrapping layer nanometer polylactic acid fiber, the partial hollow structure of the wrapping layer nanometer polylactic acid fiber, the pore structure between the nanometer polylactic acid fiber assemblies, the groove structure on the surface of the cross-shaped moisture-wicking shaped fiber in the core fiber layer, and the hydrophilic finishing layer on the outer surface of the core-spun yarn together construct the wettability gradient difference effect of the yarn surface, so that the yarn has high moisture absorption, moisture conduction and water transmission performance.

[0084] Preparation method:

[0085] (1) Prepare polylactic acid spinning solution: polylactic acid is vacuum dried at 60℃ for 30min before preparation, the solvent is selected from trichloromethane and acetone in a ratio of 8:1, and the mixture is uniformly stirred at 60℃ for 2h by a magnetic stirrer to prepare polylactic acid spinning stock solution with a mass fraction of 15%; 1% dodecanal is added to the polylactic acid in the spinning stock solution, and the mixture is uniformly stirred at room temperature for 45min by a magnetic stirrer to obtain a homogeneous distribution of the spinning solution.

[0086] (2) Prepare polyvinyl alcohol solution: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40℃ for 3h by a magnetic stirrer, and then is left to stand for 4h to remove bubbles, so as to obtain polyvinyl alcohol solution with a mass fraction of 5%.

[0087] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 27kv, the pushing speed of polylactic acid spinning solution is 2mL / h, the pushing speed of polyvinyl alcohol solution is 3mL / h, the distance between two needles is 20cm, the distance between needle and collecting roller is about 20cm, the winding speed is 2r / min, the twisting speed of horn mouth is 350r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0088] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities, so that the surface of nanometer polylactic acid fiber presents a porous structure with different specifications and a groove structure with different depths formed due to shrinkage. The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0089] Example 9

[0090] (1) The polylactic acid spinning solution is prepared: the polylactic acid is vacuum dried at 60℃ for 30min, the solvent is selected from trichloromethane and acetone, the ratio of the two is 8:1, the mixture is uniformly stirred at 60℃ for 2h, the polylactic acid spinning stock solution with a mass fraction of 9% is prepared; 2% of radix bupleuri is added to the polylactic acid in the spinning stock solution, the mixture is uniformly stirred at 60℃ for 45min, and a homogeneous distribution of the spinning solution is obtained.

[0091] (2) The polyvinyl alcohol solution is prepared: polyvinyl alcohol (type 17-88) is added to deionized water, the mixture is uniformly stirred at 40℃ for 3h, and defoaming is performed for 4h, so that the polyvinyl alcohol solution with a mass fraction of 9% is obtained.

[0092] (3) The process of coaxial conjugate electrospinning device is as follows: the core layer is selected from polylactic acid spinning solution, the core layer is selected from polyvinyl alcohol solution, the coaxial needle is selected from 25G / 18G, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 24cm, the distance between needle and collecting roller is about 32cm, the winding speed is 5r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the core fiber layer is selected from cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester of American DuPont, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0093] (4) The yarn obtained in step (3) is washed with water at room temperature for 48 h, and the water is replaced every 2 h or so to remove polyvinyl alcohol, and then the yarn is dried at 35 °C for 12 h in vacuum to remove residual impurities, which makes the surface of the nanometer polylactic acid fiber present a porous structure with different specifications and a groove structure with different depths due to shrinkage.

[0094] Comparative Example 1 (non-hollow, non-porous core-spun yarn)

[0095] The coaxial spinning machine in the coaxial conjugate electrospinning device in Figure 1 is replaced with a single-axis spinning machine.

[0096] (1) The polylactic acid spinning solution is prepared: the polylactic acid is dried at 60 °C in a constant-temperature vacuum for 30 min, the solvent is selected to be a mixture of chloroform and acetone in a ratio of 8:1, and the mixture is uniformly mixed by magnetic stirring at 60 °C for 2 h to obtain a polylactic acid spinning stock solution with a mass fraction of 9%.

[0097] (2) The polyvinyl alcohol solution is prepared: polyvinyl alcohol (type 17-88) is added to deionized water, and the mixture is stirred at 40 °C in a constant-temperature magnetic field for 3 h, and then left to stand for 4 h to remove bubbles, thereby obtaining a polyvinyl alcohol solution with a mass fraction of 9%.

[0098] (3) The process of the coaxial conjugate electrospinning device is as follows: the core layer is selected to be the polylactic acid spinning solution, the core layer is selected to be the polyvinyl alcohol solution, the coaxial needle is selected to be 25G / 18G, the spinning voltage is 18kv, the pushing speed of the polylactic acid spinning solution is 3 mL / h, the pushing speed of the polyvinyl alcohol solution is 1 mL / h, the distance between the two needles is 24 cm, the distance from the needle to the collecting roller is about 32 cm, the winding speed is 3 r / min, the twisting speed of the horn mouth is 300 r / min, the temperature is 25 °C, and the relative humidity is 40%; the core fiber layer is selected to be a cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester from the United States DuPont, and the obtained core-spun yarn is dried at 40 °C in vacuum for 36 h to remove residual solvents and other impurities.

[0099] (4) The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12 cm from the fabric.

[0100] Comparative Example 2

[0101] Only the core fiber layer is a cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester from the United States DuPont.

[0102] Comparative Example 3 (non-hollow core-spun yarn)

[0103] (1) Configuration of polylactic acid spinning solution: before preparation, polylactic acid is dried at 60°C constant temperature for 30 min, the solvent is selected as trichloromethane and acetone, the ratio of the two is 8:1, 60°C constant temperature magnetic stirring for 2h, mixing evenly, prepared 9% polylactic acid spinning stock solution; add 2% bupleurum with respect to the mass of polylactic acid in the spinning stock solution, 60°C constant temperature magnetic stirring for 45 min until mixed evenly, get homogeneous distribution of spinning solution.

[0104] (2) Configuration of polyvinyl alcohol solution: polyvinyl alcohol (17-88 type) is added to deionized water, 40°C constant temperature magnetic stirring for 3h, standing for 4h defoaming, get 9% polyvinyl alcohol solution.

[0105] (3) The process of coaxial conjugate electrospinning device is: the core layer is selected as polylactic acid spinning solution, the core layer is selected as polyvinyl alcohol solution, the coaxial needle is selected as 25G / 18G, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between two needles is 24cm, the distance from needle to collecting roller is about 32cm, the winding speed is 3r / min, the twisting speed of horn mouth is 300r / min, the temperature is 25°C, the relative humidity is 40%; the core fiber layer is selected as cross-shaped moisture wicking filament fiber of 75D / 100f, 100% polyester of American dupont, the prepared core spun yarn is dried at 40°C vacuum for 36h to remove residual solvent and other impurities.

[0106] (4) The core spun yarn is woven into fabric, and at the same time, 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0107] Comparative example 4 (non-porous core spun yarn)

[0108] (1) Configuration of polylactic acid spinning solution: before preparation, polylactic acid is dried at 60°C constant temperature for 30 min, the solvent is selected as trichloromethane and acetone, the ratio of the two is 8:1, 60°C constant temperature magnetic stirring for 2h, mixing evenly, prepared 9% polylactic acid spinning stock solution.

[0109] (2) Configuration of polyvinyl alcohol solution: polyvinyl alcohol (17-88 type) is added to deionized water, 40°C constant temperature magnetic stirring for 3h, standing for 4h defoaming, get 9% polyvinyl alcohol solution.

[0110] (3) The process of coaxial conjugate electrospinning device is as follows: polylactic acid spinning solution is selected as the core layer, polyvinyl alcohol solution is selected as the core layer, 25G / 18G is selected as the coaxial needle, the spinning voltage is 18kv, the pushing speed of polylactic acid spinning solution is 3mL / h, the pushing speed of polyvinyl alcohol solution is 1mL / h, the distance between the two needles is 24cm, the distance from the needle to the collecting roller is about 32cm, the winding speed is 3r / min, the twisting speed of the horn mouth is 300r / min, the temperature is 25℃, and the relative humidity is 40%; the cross-shaped moisture-wicking filament fiber of 75D / 100f, 100% polyester from the United States DuPont is selected as the core fiber layer, and the core-spun yarn prepared is vacuum dried at 40℃ for 36h to remove residual solvents and impurities.

[0111] (4) The yarn obtained in step (3) is washed with water at room temperature for 48h, the water is replaced every 2h or so to remove polyvinyl alcohol, and vacuum drying is performed at 35℃ for 12h to remove residual impurities.

[0112] (5) The core-spun yarn is knitted into a fabric, and a 9% hydrophilic finishing agent is sprayed on the surface of the fabric at a distance of 12cm from the fabric.

[0113] Test Example

[0114] Figure 3 The cross-sectional scanning electron microscope image of the multi-scale interconnected moisture-wicking core-spun yarn prepared in Example 1 can be seen from Figure 3 , which has a clear sheath-core structure. Figure 4 and 5 are the cross-sectional and surface scanning electron microscope images of the nanometer polylactic acid fiber in the multi-scale interconnected moisture-wicking core-spun yarn prepared in Example 1, from Figure 4 , it can be seen that the nanometer polylactic acid fiber has a hollow structure and a porous surface. The hollow structure is irregular in shape, which is due to the support problem of the skin layer. After removing the core material, some parts will shrink inward to varying degrees, or the cross-sectional hollow structure will be irregular due to the incomplete removal of the core material. The surface is porous because the dodecanal added in the spinning solution volatilizes to form a large number of regular porous structures on the surface of the nanofiber with uniform pore size. From Figure 5 , it can be seen that the polylactic acid fiber surface has a groove structure, which is due to the shrinkage of the core layer nanofiber surface after the removal of the core layer or the different synchronization of the inner and outer layer spinning solution setting time, and the faster setting speed of the outer layer forms an irregularly distributed surface longitudinal groove structure.

[0115] Performance Test

[0116] The yarn obtained by the method in the examples and comparative examples is knitted into a fabric of a certain size, such as Figure 6As shown, the relevant performance tests were carried out according to the standard arrangement, including wicking height, drop water diffusion time, drop water diffusion rate, drop water diffusion area, contact angle, air permeability, moisture permeability and mechanical properties, and part of the test specific requirements can refer to the standards GB / T 21655.1-2023 Textiles - Assessment of the moisture management properties of fabrics - Part 1: Single-Item Combination Test Method, GB / T 21655.1-2008 Textiles - Assessment of the moisture management properties of fabrics - Part 1: Single-Item Combination Test Method, GB / T 21655.2-2019 Textiles - Assessment of the moisture management properties of fabrics - Part 2: Dynamic Water Transfer Method, GB / T 3916-2013 Textiles - Determination of Breaking Force and Elongation at Break of Individual Yarns in Package Yarns (CRE Method) and FZ T 01071-2008 Textiles - Capillary Effect Test Method.

[0117] Test 1

[0118] The wicking height test was carried out according to the standards GB / T 21655.1-2023 Textiles - Assessment of the moisture management properties of fabrics - Part 1: Single-Item Combination Test Method and industry standard FZ T 01071-2008 Textiles - Capillary Effect Test Method.

[0119] As shown in Figure 7 , the wicking height of the core-spun yarn prepared by the application is higher than that of the comparative examples 1-4, which indicates that the multi-level pore structure of the yarn surface construction has a certain transmission effect, which promotes the increase of the wicking height of the yarn.

[0120] Test 2

[0121] The drop water diffusion experiment test was carried out according to the standards GB / T 21655.1-2023 Textiles - Assessment of the moisture management properties of fabrics - Part 1: Single-Item Combination Test Method and GB / T 21655.2-2019 Textiles - Assessment of the moisture management properties of fabrics - Part 2: Dynamic Water Transfer Method, Figure 8 the drop water diffusion test physical map of the sample corresponding to example 6, as Figure 9 known, the drop water diffusion rate of the fabric after arrangement is calculated, the drop water diffusion time is not more than 3s, and the contact angle is 0°, which is generally superior to the 29.25s drop water diffusion performance of the measured cotton fabric.

[0122] Test 3

[0123] The air permeability of the fabric was measured, as Figure 10 shown, it can be seen that the air permeability of the fabric is more than 250mm / s.

[0124] Test 4

[0125] The determination is performed according to the standard GB / T 3916-2013 Textiles Determination of Breaking Force and Elongation of Single Yarn in Package (CRe method). Figure 11 It can be known that the breaking stress and the breaking elongation are both excellent compared with the breaking stress 10-21 kPa and the breaking elongation 5-8% of the combed cotton yarn, the breaking stress of the prepared yarn is more than 50 mPa, the breaking elongation is more than 27%, and the comprehensive mechanical performance is relatively excellent.

[0126] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing multi-scale interconnected moisture-wicking core-spun yarn, comprising using an apparatus for preparing electrospun nanofiber core-spun yarn, characterized in that, The apparatus for preparing electrospun nanofiber core-spun yarn includes a coaxial electrospinning machine. The preparation method is as follows: (1) dissolve the polymer and pore-forming agent to prepare the skin spinning solution; (2) dissolve the water-soluble polymer to prepare the core spinning solution; (3) the skin spinning solution and the core spinning solution are used to obtain the skin-core structure nanofibers through the coaxial electrospinning machine and wrap them on the core fiber layer; (4) wash the core-spun yarn prepared in step (3) to wash away the water-soluble polymer and prepare multi-scale interconnected moisture-wicking core-spun yarn; the core-spun yarn prepared in step (4) is hydrophilically treated with a hydrophilic finishing agent. The steps are as follows: prepare a hydrophilic finishing agent solution with a concentration of 5-10wt%, and then spray it onto the core-spun yarn to form a hydrophilic finishing layer on the surface. The hydrophilic finishing agent is a hydrophilic finishing agent containing modified polysiloxane surface active ingredients. The amount of the pore-forming agent added is 1-3% of the polymer mass; the pore-forming agent is a volatile oil or a substance containing volatile oil; the volatile oil is 4-terpineol or dodecanoic acid; the substance containing volatile oil is Bupleurum chinense. The polymer is polylactic acid or polyacrylonitrile; The water-soluble polymer is polyvinyl alcohol or polyvinylpyrrolidone; The multi-scale interconnected moisture-wicking core-spun yarn includes a fiber wrapping layer and a core fiber layer; the fibers in the fiber wrapping layer are nanofibers, which have a hollow structure, grooves on the surface, and pores on the fiber wall; the fibers in the core fiber layer are irregularly shaped fibers with grooves on the surface.

2. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 1, characterized in that, The concentration of polymer in the skin spinning solution is 5-15 wt%.

3. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 2, characterized in that, The solvent of the skin spinning solution is one or more of hexafluoroisopropanol, chloroform, or acetone.

4. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 3, characterized in that, The concentration of water-soluble polymer in the core spinning solution is 5-15 wt%.

5. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 4, characterized in that, The solvent in the core spinning solution is water.

6. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 5, characterized in that, The irregular fiber is a fiber with a cross-shaped cross section.

7. The method for preparing multi-scale interconnected moisture-wicking core-spun yarn according to claim 1, characterized in that, The apparatus for preparing electrospun nanofiber core-spun yarn is a coaxial conjugate electrospinning apparatus, which further includes a twisting device, an unwinding device, and a winding device. It is equipped with two coaxial electrospinning machines arranged symmetrically. The technical parameters for preparing multi-scale interconnected moisture-wicking core-spun yarn using the coaxial conjugate electrospinning apparatus are as follows: voltage 10-27kV, spinning speed 1-3mL / h, distance between two needles 20-35cm, receiving distance 20-35cm, winding device rotation speed 2-5r / min, and twisting device rotation speed 300-400r / min.

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