MXene / TPU nano yarn and preparation method and application thereof

Abstract

The invention belongs to the technical field of textile, and discloses MXene / TPU nano yarn and a preparation method and application thereof.The MXene / TPU nano yarn is mainly composed of TPU nano yarn and MXene pieces, the MXene pieces are attached to the surface of TPU nano fiber and enriched on the surface layer of the MXene / TPU nano yarn, and the MXene pieces are evenly distributed on the surface layer of the MXene / TPU nano yarn; the preparation method comprises the following steps: extruding a TPU solution from a needle, forming a polymer jet flow under the action of an electrostatic field force, feeding the polymer jet flow into a coagulating bath containing an MXene sheet to form a nanofiber bundle, guiding the nanofiber bundle to linearly move, and controlling the coagulating bath to spirally rotate and wind around the nanofiber bundle at the same time; according to the application, the MXene / TPU nano yarn serves as covering yarn of the covering yarn, the covering yarn is prepared, and then the covering yarn and the hydrophilic Coolmax yarn are woven into a two-warp two-weft double-layer weave fabric. The conductive fabric disclosed by the invention has excellent sensing performance, relatively high one-way moisture conduction capability and relatively good comfort.

Description

Technical Field

[0001] The invention belongs to the field of textile technology and relates to a MXene / TPU nano yarn and a preparation method and application thereof. Background Art

[0002] As people yearn for a high-quality life, the clothing fabric industry has received more and more attention. As the basic material of clothing, fabrics have gradually changed from the original traditional production method based on cotton, linen, silk and wool to the current smart textiles dominated by artificial fibers and diversified production, making their applications more extensive. In terms of sports and fitness, smart textiles can monitor sports parameters such as heart rate, blood pressure, and pulse, so that users can keep abreast of their physical conditions such as exercise intensity and energy consumption. Smart wearable textiles have functions such as sensing, human-computer interaction, one-way moisture conduction, and anti-aging. These are the needs of a new generation of users that traditional textiles cannot meet, so the development of smart wearable technology is imminent.

[0003] MXene is a transition metal carbide or nitride material with excellent electrical conductivity and mechanical properties, and has excellent electron conduction ability. The rich functional groups on the surface of this material provide a large number of active sites, and it exhibits good processability in a variety of solvents. Electrospinning technology is a method of spinning polymer solutions or melts into fibers through electrostatic action. The micro-nano fibers prepared by this technology have the advantages of high specific surface area, high porosity, and strong process controllability, so they are widely used in scientific fields such as textiles, medical treatment, filtration, and energy.

[0004] In view of the excellent properties of MXene and the advantages of electrospinning technology, researchers at home and abroad have combined the two and are actively conducting related research.

[0005] The literature (Supercapacitor Performance of MXene-Coated Carbon Nanofiber Electrodes[J].C, 2024, 10(2).DOI:10.3390 / c10020032.) uses electrospinning technology to prepare polyacrylonitrile / MXene nanosheet blended nanofibers and successfully develops a highly sensitive sensor. However, the MXene loading in the polyacrylonitrile / MXene nanosheet blended nanofibers prepared by this method is relatively low, only about 1wt%.

[0006] Therefore, there is a need for a MXene / TPU nano yarn and a preparation method and application thereof to solve the above problems, which is of great significance. Summary of the invention

[0007] The purpose of the present invention is to solve the problems existing in the prior art and to provide a MXene / TPU nano yarn and a preparation method and application thereof.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A MXene / TPU nano yarn mainly consists of TPU (thermoplastic polyurethane) nano yarn and MXene sheets. The TPU nano yarn consists of multiple TPU nano fibers. The MXene sheets are attached to the surface of the TPU nano fibers and are enriched in the surface layer of the MXene / TPU nano yarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nano yarn.

[0010] As the preferred technical solution:

[0011] As described above, the diameter of the MXene / TPU nanoyarn is 20-35 μm, the ratio of the thickness of the surface layer of the MXene / TPU nanoyarn to the diameter of the MXene / TPU nanoyarn is 1:1.5-2.5, and the diameter of the TPU nanofiber is 200-400 nm; the content of MXene sheets in the MXene / TPU nanoyarn is 15-30 wt%, and the loading amount of MXene can reach a level far higher than that of the prior art.

[0012] As described above, the conductivity of the MXene / TPU nanoyarn is 30-100S / cm, the sensing coefficient is 8-15, and the elongation at break is 400-500%. It can be seen that the MXene / TPU nanoyarn has high conductivity and stretchability, mainly because the MXene sheets are evenly distributed on the surface of the MXene / TPU nanoyarn.

[0013] The present invention also provides a method for preparing a MXene / TPU nano yarn as described in any of the above items, wherein the TPU solution is first squeezed out of a needle, and a polymer jet is formed under the action of an electrostatic field force, and the polymer jet is then sent into a coagulation bath containing MXene sheets to form a nanofiber bundle, and the nanofiber bundle is then guided to perform linear motion, while the coagulation bath is controlled to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn is obtained by winding. Controlling the spiral rotation of the coagulation bath around the nanofiber bundle can improve the uniformity of the distribution of the MXene sheets in the coagulation bath, which is beneficial to the enrichment of the MXene sheets on the surface of the nano yarn, and is also beneficial to the uniform distribution of the MXene sheets on the surface of the nano yarn.

[0014] As the preferred technical solution:

[0015] The method described above, in which the polymer jet is formed under the action of the electrostatic field force, is implemented by: connecting the needle to a high-voltage power supply, and grounding the conductive container containing the coagulation bath; the voltage of the high-voltage power supply is 15-20 kV;

[0016] The method for controlling the spiral rotation of the coagulation bath around the nanofiber bundle is as follows: after installing a paddle stirrer at the rear end of the starting point of the nanofiber bundle running path in the coagulation bath, the paddle stirrer is started, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath.

[0017] In the method described above, the content of TPU in the TPU solution is 10-20wt%, and the solvent is a mixture of DMF and acetone in a volume ratio of 1:1; the content of MXene sheets in the coagulation bath containing MXene sheets is 5-15mg / ml, and the coagulation bath containing MXene sheets consists of MXene sheets, water and DMF; the temperature of the coagulation bath containing MXene sheets is 25-35°C; the paddle agitator is a three-blade paddle agitator, the rotation speed is 100-1000rpm, and the paddles are flat blades.

[0018] The present invention also provides a core-spun yarn, wherein the core yarn is a polyester yarn, and the outer covering yarn is a MXene / TPU nano yarn as described in any one of the above items. The core-spun yarn of the present invention has both sensing and spinnability.

[0019] As the preferred technical solution:

[0020] The core-spun yarn as described above has a core yarn diameter of 0.3 mm, a twist angle of 40°, and an internal and external twist ratio of 10-35.

[0021] The present invention also provides a one-way moisture-conducting conductive fabric, which is a two-warp and two-weft double-layer fabric woven from hydrophilic Coolmax yarn and a core-spun yarn as described in any one of the above items, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-to-inside layer-changing weaving process, and the core-spun yarn is located in the inner layer; the hydrophilic Coolmax fiber is a polyester fiber with a shaped cross-section of a four-groove cross-section, and these grooves give the fiber a capillary wicking effect, which is conducive to the fiber quickly absorbing sweat on the skin surface and promoting the evaporation of sweat from the surface layer of the fabric. In the present invention, "the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-to-inside layer-changing weaving process" can utilize the siphon effect of the hydrophilic Coolmax yarn to quickly guide liquids such as sweat to the surface layer.

[0022] As the preferred technical solution:

[0023] As described above, the unidirectional moisture-conducting conductive fabric has a wetting time of 10-20s, a maximum wetting radius of 5-15mm, a diffusion rate of comprehensive moisture conduction and quick drying capacity (OMMC) of 0.2-0.6, and an electrical conductivity of 10-60S / m.

[0024] Beneficial effects:

[0025] (1) The present invention utilizes the advantage of the larger specific surface area of ​​electrospun fibers to load more MXene nanosheets into the cross section of the nanofiber yarn. Under the action of the electrostatic field force and by controlling the spiral rotation of the coagulation bath around the nanofiber bundle, the MXene sheets can be attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn, so that the prepared MXene / TPU nanoyarn has high conductivity and stretchability.

[0026] (2) The present invention utilizes a coaxial winding device, uses polyester yarn as the core yarn, and uses MXene / TPU nanofiber yarn as the outer covering yarn, so that the obtained core-covered yarn has high electrical conductivity and the spinnability of traditional fibers.

[0027] (3) The present invention ensures that the inner and outer layers have a synergistic effect by designing a double-layer fabric structure, which also gives the fabric a unique unidirectional moisture-conducting property and realizes efficient transmission of liquid in a specific direction. At the same time, this characteristic also makes the unidirectional moisture-conducting conductive fabric prepared by the present invention more suitable for making clothing fabrics that quickly wick away sweat and keep dry.

[0028] (4) The present invention can directly collect MXene / TPU nanofiber yarns through a MXene coagulation bath, without the need to collect the suspension, wash, and dry the nanofiber yarns, thereby eliminating many preparation steps, optimizing the workflow, and improving production efficiency.

[0029] (5) TPU has a unique molecular structure, consisting of rigid blocks generated by the reaction of diisocyanate and chain extender, and flexible segments generated by the reaction of diisocyanate and macromolecular polyol, which are arranged alternately. This special structure gives TPU excellent aging resistance. The present invention uses this property of TPU to successfully prepare MXene / TPU nano yarn and conductive fabric, both of which show excellent aging resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the nanofiber bundle of the present invention rotating in a coagulation bath containing a MXene sheet;

[0031] Figure 2 It is a schematic cross-sectional view of the MXene / TPU nano yarn of the present invention;

[0032] Figure 3 Schematic diagram of the preparation of MXene / TPU nano yarn and core-spun yarn according to the present invention; in the figure, θ is the twist angle;

[0033] Among them, 1-MXene sheet, 2-TPU nanofiber, 3-high voltage power supply, 4-TPU solution, 5-coagulation bath, 6-MXene / TPU nanoyarn, 7-core-spun yarn, 8-paddle stirrer. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0035] The testing methods of the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0036] Conductivity: The unidirectional moisture-conducting conductive fabrics prepared in each embodiment and each comparative example were respectively used as samples, and then the samples were tested with reference to the GB / T 12703-1991 standard. The specific process is: firstly, the samples were treated by methods 4.1 to 4.4 in the GB / T 12703-1991 standard, and then the volume resistivity of the treated samples was tested with reference to the GB / T 12703.4-2010 standard (the test environment conditions were: temperature 23° C., relative humidity 35%), and then the conductivity was calculated based on the obtained resistivity.

[0037] Sensing coefficient: The MXene / TPU nano yarns prepared in each embodiment and each comparative example were respectively used as samples. The two ends of the samples were first fixed on an EUT2203 electronic universal testing machine and then the initial resistance value R was measured using a 34456A digital multimeter. 0 The sample was then stretched using an electronic tensile testing machine (the sample clamping length was 20 mm, the stretching speed was 20 mm / min, and the initial tension was 0.2 cN). The stretching was completed when the strain on the MXene / TPU nanofiber was 80%. A digital multimeter was then used to measure the resistance value R of the stretched sample. 1 Finally, the sensing coefficient (GF) is calculated according to the measured data by the calculation formula, and the calculation formula is: , where is the resistance change (i.e. the resistance after stretching R 1 Subtract the initial resistance R 0 ), R 0 is the initial resistance, is the strain (i.e., the change in the length of the nanoyarn divided by its original length).

[0038] Elongation at break: The MXene / TPU nanoyarns prepared in each embodiment and each comparative example were used as samples, respectively, and the samples were placed in an environment of 25°C and 55% relative humidity for 4 hours, and then the elongation at break of the samples was tested with reference to GB / T 3923.1-2013 standard (the test environment conditions were: temperature 23°C; relative humidity 35%). A constant rate of elongation (CRE) tester was used during the test, and the constant rate of stretching was 100 mm / min.

[0039] Wetting time: The unidirectional moisture-conducting conductive fabrics prepared in each embodiment and each comparative example were respectively used as samples, and then the samples were tested using a liquid moisture management tester (MMT) in accordance with GB / T 21655.2-2009 standard. The wetting time is the time required from the liquid contacting the surface of the inner layer (hydrophobic layer) of the fabric to the fabric starting to absorb moisture.

[0040] Maximum wetting radius: The unidirectional moisture-conducting conductive fabrics prepared in each embodiment and each comparative example were respectively used as samples, and then the inner layer (hydrophobic layer) of the sample was tested with reference to GB / T 21655.1-2008 "Evaluation of Moisture Absorption and Quick-drying Properties of Textiles Part 1: Single Item Combined Test Method", and the standard atmosphere specified in GB6529 was used during the test.

[0041] Diffusion rate comprehensive moisture conduction and quick-drying ability: The unidirectional moisture conduction conductive fabrics prepared in each embodiment and each comparative example were respectively used as samples, and then the liquid moisture management tester (manufacturer: Wenzhou Fangyuan Instrument Co., Ltd., model: FFZ381-II) with its own data system was used to conduct a comprehensive evaluation of various indicators on both sides of the sample with reference to GB / T 21655.1-2008 "Evaluation of moisture absorption and quick-drying performance of textiles Part 1: Single combination test method" standard.

[0042] Example 1

[0043] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0044] (1) Preparation of raw materials and installation and connection of equipment;

[0045] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 10wt%;

[0046] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 5 mg / ml;

[0047] like Figure 3 As shown, the needle is connected to a high voltage power supply 3 with a voltage of 15 kV, and the conductive container containing the coagulation bath 5 is grounded;

[0048] The paddle stirrer 8 is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the nanofiber bundle running path in the coagulation bath, and the central axis of the paddle stirrer is parallel to the nanofiber bundle running path in the coagulation bath;

[0049] (2) If Figure 1 , Figure 3 As shown, the TPU solution 4 is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 25°C to form a nanofiber bundle, and then the nanofiber bundle is guided to perform linear motion. At the same time, the paddle stirrer 8 is started to control the coagulation bath 5 to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn 6 is obtained by winding. The rotation speed of the paddle stirrer is 100 rpm.

[0050] The final MXene / TPU nano yarn (with a cross section as shown in Figure 2 As shown in the figure, the nano-yarn is composed of TPU and MXene sheets 1, the TPU nano-yarn is composed of a plurality of TPU nanofibers 2, the MXene sheets are attached to the surface of the TPU nanofibers 2 and are enriched in the surface layer of the MXene / TPU nano-yarn, and the MXene sheets are evenly distributed on the surface layer of the MXene / TPU nano-yarn;

[0051] The diameter of MXene / TPU nanoyarn is 35μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:2.5, and the diameter of TPU nanofiber is 200nm; the content of MXene sheets in MXene / TPU nanoyarn is 15wt%; the electrical conductivity of MXene / TPU nanoyarn is 30S / cm, the sensing coefficient is 8, and the elongation at break is 400%.

[0052] A core-spun yarn is prepared using a coaxial winding device, such as Figure 3 As shown, polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand JXA009, yarn count 40s, diameter 0.3mm) is used as the core yarn, and the above-prepared MXene / TPU nano yarn 6 is used as the outer covering yarn to prepare the core-spun yarn 7.

[0053] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 35.

[0054] A unidirectional moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above. The hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0055] The final unidirectional moisture-conducting conductive fabric has a wetting time of 20 s, a maximum wetting radius of 5 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.2, and an electrical conductivity of 10 S / m.

[0056] Comparative Example 1

[0057] A method for preparing MXene / TPU nano yarn is basically the same as that of Example 1, except that in step (2), the paddle stirrer is not started to control the coagulation bath to spirally rotate around the nanofiber bundle.

[0058] The structure of the MXene / TPU nanoyarn finally obtained is basically the same as that in Example 1, except that: the MXene sheets are evenly distributed on the surface of the MXene / TPU nanoyarn; the diameter of the MXene / TPU nanoyarn is 40 μm, and the ratio of the thickness of the surface layer of the MXene / TPU nanoyarn to the diameter of the MXene / TPU nanoyarn is 1:2.6; the content of MXene sheets in the MXene / TPU nanoyarn is 7.5 wt%; the electrical conductivity of the MXene / TPU nanoyarn is 20 S / cm, the sensing coefficient is 5, and the elongation at break is 240%.

[0059] A core-spun yarn is basically the same as Example 1, except that the outer covering yarn is the MXene / TPU nano yarn prepared in this comparative example.

[0060] A unidirectional moisture-conducting conductive fabric, which is basically the same as Example 1, except that the core-spun yarn used is the core-spun yarn prepared in this comparative example;

[0061] The conductivity of the finally obtained unidirectional moisture-conducting conductive fabric is 8S / m.

[0062] By comparing Comparative Example 1 with Example 1, it can be seen that the conductivity, sensing coefficient and elongation at break of the MXene / TPU nanoyarn prepared in Comparative Example 1 are reduced, and the conductivity of the unidirectional moisture-conducting conductive fabric prepared is reduced. This is because the conductive performance depends to a large extent on the integrity of the continuous network structure composed of MXene sheets, and the nanofiber bundles of Comparative Example 1 lack the uniform mixing effect of the paddle stirrer, and the distribution of the MXene sheets in the coagulation bath becomes uneven, which not only reduces the enrichment of the MXene sheets on the surface of the nanoyarn, but also the distribution of the MXene sheets enriched on the surface of the MXene / TPU nanoyarn will be uneven, resulting in a decrease in the conductivity of the MXene / TPU nanoyarn, and because the MXene sheets provide mechanical reinforcement, the uneven distribution of the MXene sheets on the surface of the MXene / TPU nanoyarn will also lead to a decrease in the mechanical properties of the MXene / TPU nanoyarn, and therefore the conductivity of the unidirectional moisture-conducting conductive fabric prepared in this comparative example is reduced.

[0063] Comparative Example 2

[0064] A method for preparing MXene / TPU nano yarn, same as Example 1.

[0065] A core-spun yarn, same as that in Example 1.

[0066] A unidirectional moisture-conducting conductive fabric, which is basically the same as Example 1, except that the hydrophilic Coolmax yarn of this comparative example does not enter the inner layer through the outer and inner layer changing weaving process;

[0067] The final unidirectional moisture-conducting conductive fabric has a wetting time of 55 s, a maximum wetting radius of 4 mm, and a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.15.

[0068] By comparing Comparative Example 2 with Example 1, it can be seen that the diffusion speed and comprehensive moisture conduction and quick-drying ability of the unidirectional moisture-conducting conductive fabric in Comparative Example 2 are reduced. This is because the unidirectional moisture-conducting conductive fabric prepared in Comparative Example 2 does not adopt the surface-to-surface layer weaving process, which will cause the hydrophilic yarn to be unable to enter the hydrophobic layer and form evenly distributed hydrophilic moisture-conducting points. In addition, since the inner layer of the conductive fabric is completely composed of hydrophobic yarns, the rapid conduction of the liquid to the outer layer and effective evaporation may be hindered, thereby weakening the unidirectional moisture-conducting ability of the fabric, making it impossible for the liquid to diffuse and evaporate quickly.

[0069] Example 2

[0070] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0071] (1) Preparation of raw materials and installation and connection of equipment;

[0072] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 12wt%;

[0073] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 8 mg / ml;

[0074] Connect the needle to a power source with a voltage of 16 kV and ground the conductive container containing the coagulation bath;

[0075] The paddle stirrer is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the running path of the nanofiber bundle in the coagulation bath, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath;

[0076] (2) The TPU solution is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 28°C to form a nanofiber bundle. The nanofiber bundle is then guided to perform linear motion, and a paddle stirrer is started at the same time to control the coagulation bath to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn is obtained by winding. The rotation speed of the paddle stirrer is 300 rpm.

[0077] The final MXene / TPU nanoyarn is composed of TPU nanoyarn and MXene sheets. The TPU nanoyarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn.

[0078] The diameter of MXene / TPU nanoyarn is 32μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:2.3, and the diameter of TPU nanofiber is 250nm; the content of MXene sheets in MXene / TPU nanoyarn is 17wt%; the electrical conductivity of MXene / TPU nanoyarn is 40S / cm, the sensing coefficient is 10, and the elongation at break is 420%.

[0079] A core-spun yarn was prepared using a coaxial winding device, with polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand: JXA009, yarn count: 40s, diameter: 0.3 mm) as the core yarn, and the above-prepared MXene / TPU nano yarn as the outer covering yarn.

[0080] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 23.

[0081] A one-way moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0082] The final unidirectional moisture-conducting conductive fabric has a wetting time of 18 s, a maximum wetting radius of 7 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.3, and an electrical conductivity of 20 S / m.

[0083] Example 3

[0084] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0085] (1) Preparation of raw materials and installation and connection of equipment;

[0086] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 14wt%;

[0087] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 10 mg / ml;

[0088] Connect the needle to a power source with a voltage of 17 kV and ground the conductive container containing the coagulation bath;

[0089] The paddle stirrer is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the running path of the nanofiber bundle in the coagulation bath, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath;

[0090] (2) The TPU solution is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 29°C to form a nanofiber bundle. The nanofiber bundle is then guided to perform linear motion, and a paddle agitator is started at the same time to control the coagulation bath to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn is obtained by winding. The rotation speed of the paddle agitator is 500 rpm.

[0091] The final MXene / TPU nanoyarn is composed of TPU nanoyarn and MXene sheets. The TPU nanoyarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn.

[0092] The diameter of MXene / TPU nanoyarn is 29μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:2.1, and the diameter of TPU nanofiber is 300nm; the content of MXene sheets in MXene / TPU nanoyarn is 20wt%; the electrical conductivity of MXene / TPU nanoyarn is 55S / cm, the sensing coefficient is 11, and the elongation at break is 450%.

[0093] A core-spun yarn was prepared using a coaxial winding device, with polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand: JXA009, yarn count: 40s, diameter: 0.3 mm) as the core yarn, and the above-prepared MXene / TPU nano yarn as the outer covering yarn.

[0094] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 17.5.

[0095] A one-way moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0096] The final unidirectional moisture-conducting conductive fabric has a wetting time of 16 s, a maximum wetting radius of 8 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.35, and an electrical conductivity of 30 S / m.

[0097] Example 4

[0098] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0099] (1) Preparation of raw materials and installation and connection of equipment;

[0100] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 15wt%;

[0101] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 12 mg / ml;

[0102] Connect the needle to a power source with a voltage of 18 kV and ground the conductive container containing the coagulation bath;

[0103] The paddle stirrer is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the running path of the nanofiber bundle in the coagulation bath, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath;

[0104] (2) The TPU solution is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 30°C to form a nanofiber bundle. The nanofiber bundle is then guided to perform linear motion, and a paddle stirrer is started at the same time to control the coagulation bath to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn is obtained by winding. The rotation speed of the paddle stirrer is 700 rpm.

[0105] The final MXene / TPU nanoyarn is composed of TPU nanoyarn and MXene sheets. The TPU nanoyarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn.

[0106] The diameter of MXene / TPU nanoyarn is 26μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:1.9, and the diameter of TPU nanofiber is 350nm; the content of MXene sheets in MXene / TPU nanoyarn is 25wt%; the electrical conductivity of MXene / TPU nanoyarn is 65S / cm, the sensing coefficient is 12, and the elongation at break is 460%.

[0107] A core-spun yarn was prepared using a coaxial winding device, with polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand: JXA009, yarn count: 40s, diameter: 0.3 mm) as the core yarn, and the above-prepared MXene / TPU nano yarn as the outer covering yarn.

[0108] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 14.

[0109] A one-way moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0110] The final unidirectional moisture-conducting conductive fabric has a wetting time of 14 s, a maximum wetting radius of 10 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.4, and an electrical conductivity of 40 S / m.

[0111] Example 5

[0112] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0113] (1) Preparation of raw materials and installation and connection of equipment;

[0114] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 18wt%;

[0115] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 13 mg / ml;

[0116] Connect the needle to a power source with a voltage of 19 kV and ground the conductive container containing the coagulation bath;

[0117] The paddle stirrer is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the running path of the nanofiber bundle in the coagulation bath, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath;

[0118] (2) The TPU solution is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 32°C to form a nanofiber bundle. The nanofiber bundle is then guided to perform linear motion, and a paddle agitator is started at the same time to control the coagulation bath to spirally rotate around the nanofiber bundle, and the MXene / TPU nano yarn is obtained by winding. The speed of the paddle agitator is 900 rpm.

[0119] The final MXene / TPU nanoyarn is composed of TPU nanoyarn and MXene sheets. The TPU nanoyarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn.

[0120] The diameter of MXene / TPU nanoyarn is 23μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:1.7, and the diameter of TPU nanofiber is 380nm; the content of MXene sheets in MXene / TPU nanoyarn is 28wt%; the electrical conductivity of MXene / TPU nanoyarn is 80S / cm, the sensing coefficient is 13, and the elongation at break is 480%.

[0121] A core-spun yarn was prepared using a coaxial winding device, with polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand: JXA009, yarn count: 40s, diameter: 0.3 mm) as the core yarn, and the above-prepared MXene / TPU nano yarn as the outer covering yarn.

[0122] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 12.

[0123] A one-way moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0124] The final unidirectional moisture-conducting conductive fabric has a wetting time of 12 s, a maximum wetting radius of 12 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.5, and an electrical conductivity of 50 S / m.

[0125] Example 6

[0126] A method for preparing MXene / TPU nano yarn, the steps are as follows:

[0127] (1) Preparation of raw materials and installation and connection of equipment;

[0128] TPU solution: TPU (thermoplastic polyurethane, manufactured by BASF Chemical (Shanghai) Co., Ltd., brand 1180A) was added to a mixed solvent of acetone and DMF (volume ratio 1:1), heated in a water bath at 60°C, and magnetically stirred until completely dissolved to obtain a TPU solution; wherein the content of TPU in the TPU solution was 20wt%;

[0129] Coagulation bath containing MXene sheets: composed of MXene sheets (manufacturer: Beijing Beike New Materials Technology Co., Ltd., brand number: BK2020040305, CAS number: 12363-89-2), water and DMF, the volume ratio of water to DMF is 7:3, and the content of MXene sheets is 15 mg / ml;

[0130] Connect the needle to a power source with a voltage of 20 kV and ground the conductive container containing the coagulation bath;

[0131] The paddle stirrer is a three-blade paddle stirrer, the paddle blades are flat paddle blades, the paddle stirrer is installed at the rear end of the starting point of the running path of the nanofiber bundle in the coagulation bath, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath;

[0132] (2) The TPU solution is first squeezed out of the needle at a flow rate of 0.5 ml / h, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets at 35°C to form a nanofiber bundle. The nanofiber bundle is then guided to perform linear motion, and a paddle stirrer is started to control the coagulation bath to rotate spirally around the nanofiber bundle. The MXene / TPU nano yarn is then wound up; the speed of the paddle stirrer is 1000 rpm.

[0133] The final MXene / TPU nanoyarn is composed of TPU nanoyarn and MXene sheets. The TPU nanoyarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nanoyarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nanoyarn.

[0134] The diameter of MXene / TPU nanoyarn is 20μm, the ratio of the thickness of the surface layer of MXene / TPU nanoyarn to the diameter of MXene / TPU nanoyarn is 1:1.5, and the diameter of TPU nanofiber is 400nm; the content of MXene sheets in MXene / TPU nanoyarn is 30wt%; the electrical conductivity of MXene / TPU nanoyarn is 100S / cm, the sensing coefficient is 15, and the elongation at break is 500%.

[0135] A core-spun yarn was prepared using a coaxial winding device, with polyester yarn (manufacturer: Dongguan Jinxin New Material Wire and Tape Co., Ltd., brand: JXA009, yarn count: 40s, diameter: 0.3 mm) as the core yarn, and the above-prepared MXene / TPU nano yarn as the outer covering yarn.

[0136] The twist angle of the core-spun yarn finally obtained is 40°, and the internal and external twist ratio is 10.

[0137] A one-way moisture-conducting conductive fabric is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn (manufacturer: Haiyan Jinyi Silk Spinning Co., Ltd., item number: 67671, yarn count: 40s) and the core-spun yarn prepared above, wherein the hydrophilic Coolmax yarn is mainly located on the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located on the inner layer.

[0138] The final unidirectional moisture-conducting conductive fabric has a wetting time of 10 s, a maximum wetting radius of 15 mm, a diffusion rate with a comprehensive moisture-conducting and quick-drying capability of 0.6, and an electrical conductivity of 60 S / m.

Claims

1. A MXene / TPU nano yarn, characterized in that: It is mainly composed of TPU nano yarn and MXene sheets. The TPU nano yarn is composed of multiple TPU nanofibers. The MXene sheets are attached to the surface of the TPU nanofibers and enriched in the surface layer of the MXene / TPU nano yarn. The MXene sheets are evenly distributed on the surface layer of the MXene / TPU nano yarn.

2. A MXene / TPU nano yarn according to claim 1, characterized in that: The diameter of the MXene / TPU nanoyarn is 20-35 μm, the ratio of the thickness of the surface layer of the MXene / TPU nanoyarn to the diameter of the MXene / TPU nanoyarn is 1:1.5-2.5, the diameter of the TPU nanofiber is 200-400 nm; the content of MXene sheets in the MXene / TPU nanoyarn is 15-30 wt%.

3. A MXene / TPU nano yarn according to claim 1, characterized in that: The conductivity of MXene / TPU nanoyarn is 30-100S / cm, the sensing coefficient is 8-15, and the elongation at break is 400-500%.

4. A method for preparing a MXene / TPU nano yarn as claimed in any one of claims 1 to 3, characterized in that: First, the TPU solution is squeezed out of the needle, and a polymer jet is formed under the action of the electrostatic field force. The polymer jet is then sent into a coagulation bath containing MXene sheets to form a nanofiber bundle. The nanofiber bundle is then guided to move linearly, and the coagulation bath is controlled to rotate spirally around the nanofiber bundle. The MXene / TPU nano yarn is then rolled up.

5. The method according to claim 4, characterized in that The formation of the polymer jet under the action of the electrostatic field force is achieved by connecting the needle to a high-voltage power supply and grounding the conductive container containing the coagulation bath; the voltage of the high-voltage power supply is 15-20 kV; The method for controlling the spiral rotation of the coagulation bath around the nanofiber bundle is as follows: after installing a paddle stirrer at the rear end of the starting point of the nanofiber bundle running path in the coagulation bath, the paddle stirrer is started, and the central axis of the paddle stirrer is parallel to the running path of the nanofiber bundle in the coagulation bath.

6. The method according to claim 5, characterized in that The content of TPU in the TPU solution is 10-20wt%; the content of MXene sheets in the coagulation bath containing MXene sheets is 5-15mg / ml; the temperature of the coagulation bath containing MXene sheets is 25-35°C; the paddle agitator is a three-blade paddle agitator, the rotation speed is 100-1000rpm, and the paddles are flat paddles.

7. A core-spun yarn, characterized in that: The core yarn is polyester yarn, and the outer covering yarn is a MXene / TPU nano yarn as described in any one of claims 1 to 3.

8. A core-spun yarn according to claim 7, characterized in that: The diameter of the core yarn is 0.3mm, the twist angle is 40°, and the internal and external twist ratio is 10-35.

9. A one-way moisture-conducting conductive fabric, characterized in that: The invention is a double-layer fabric with two warps and two wefts woven from hydrophilic Coolmax yarn and a core-spun yarn as claimed in claim 7 or 8, wherein the hydrophilic Coolmax yarn is mainly located in the surface layer and enters the inner layer through the surface-inside layer changing weaving process, and the core-spun yarn is located in the inner layer.

10. The one-way moisture-conducting conductive fabric according to claim 9, characterized in that: The wetting time of the unidirectional moisture-conducting conductive fabric is 10-20s, the maximum wetting radius is 5-15mm, the diffusion rate and comprehensive moisture-conducting and quick-drying ability are 0.2-0.6, and the conductivity is 10-60S / m.

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