Elastic multilayer structure composite fabric and preparation method thereof

Abstract

The invention provides an elastic multi-layer structure composite fabric and a preparation method thereof. The elastic multi-layer structure composite fabric comprises a multifunctional integration layer, an elastic supporting layer and a close-fitting cool feeling layer which are sequentially stacked and connected in a composite mode. Wherein the close-fitting cool-feeling layer is one surface in contact with the skin; the multifunctional integrated layer comprises a heat and energy storage layer and a multifunctional composite layer; and the multifunctional composite layer is adhered to the surface of the heat and energy storage layer. According to the scheme, a multi-layer structure fabric compounding mode is adopted, so that the fabric has the functions of cool feeling, antibiosis, ultraviolet prevention, heat storage, elasticity, moisture absorption, breathability, water resistance and self-cleaning, and the compounding performance is stable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile fabrics, and particularly relates to an elastic multi-layer structure composite fabric and a preparation method thereof. BACKGROUND

[0002] The multifunctional elastic fabric can well adapt to various demands in the workwear field due to its elasticity, various practical functions, comfort and durability, and is widely used in the workwear field. The traditional elastic fabric has single function and is difficult to meet the comprehensive demands in complex environments. For example, cool fabric and heat storage fabric are difficult to coexist; waterproof fabric usually sacrifices air permeability; high-elasticity fabric is prone to permanent deformation after repeated stretching; and ultraviolet-resistant material has insufficient durability. In the prior art, the multi-layer composite fabric is usually made by using chemical adhesives or mechanical stitching, which has poor environmental protection and unstable composite effect. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide an elastic multi-layer structure composite fabric and a preparation method thereof.

[0004] To solve the above technical problems, the embodiments of the present application are implemented in the following way: In a first aspect, the present application provides an elastic multi-layer structure composite fabric, comprising a multifunctional integrated layer, an elastic support layer and a close-to-body cool layer which are sequentially stacked and connected; wherein the close-to-body cool layer is the side in contact with the skin. The multifunctional integrated layer comprises a heat storage and energy storage layer and a multifunctional composite layer; the multifunctional composite layer is bonded to the surface of the heat storage and energy storage layer.

[0005] In one of the embodiments, the heat storage and energy storage layer is a tear-resistant grid woven by phase change microcapsule modified fibers, aerogel composite fibers and first organic conductive fibers; wherein the phase change microcapsule modified fibers account for 62-72%, the aerogel composite fibers account for 26-35% and the first organic conductive fibers account for 2-3% according to the mass percentage. The phase change microcapsule modified fibers are polyester fibers or polyamide fibers. The aerogel composite fibers are polyacrylonitrile matrices. The first organic conductive fibers are polyamide-based conductive fibers or polyester-based conductive fibers.

[0006] In one of the embodiments, the multifunctional composite layer comprises a micro-nano composite rough structure formed by taking fluorine-containing polyimide nanofiber membrane as a substrate and nanosilica / polytetrafluoroethylene as a composite coating; wherein 2-3% of 30 nm particle size nanometer zinc oxide and 1-2% of graphene quantum dots are doped in the composite coating. The multifunctional composite layer and the heat storage and energy storage layer are combined with a bonding transition layer coated on one side, and the bonding transition layer uses a water-based polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 0.5%-1% nano-silver with a particle size of 10 nm.

[0007] In one of the embodiments, the elastic support layer comprises: 97-98% of elastic fibers and 2-3% of second organic conductive fibers; The elastic fibers are at least one of shape memory polyurethane fibers, graphene composite elastic fibers, seaweed-based elastic biological fibers, and spandex fibers. The second organic conductive fibers are at least one of polyamide-based conductive fibers and polyester-based conductive fibers.

[0008] In one of the embodiments, the close-to-body cool feeling layer comprises: 35-43% of moisture-absorbing fibers, 28-32% of moisture-conducting and sweat-releasing fibers, and 29-33% of heat-conducting fibers. The moisture-absorbing fibers are at least one of lyocell fibers, modal fibers, cotton fibers, and bamboo fibers. The moisture-conducting and sweat-releasing fibers are at least one of COOLMXA fibers and COOLPLUS fibers. The heat-conducting fibers are jade fibers.

[0009] In a second aspect, the application provides a preparation method of the elastic multi-layer structure composite fabric of the first aspect, comprising: The multifunctional integrated layer is prepared, including preparing the heat storage and energy storage layer and preparing the multifunctional composite layer, wherein the heat storage and energy storage layer is prepared by: mixing phase change microcapsule modified fibers and aerogel composite fibers to form first base yarn, and then wrapping the first base yarn with first organic conductive fibers to form first conductive yarn; a lattice structure design with double-axial reinforcement is adopted to weave a tear-resistant grid on a jet loom; the multifunctional composite layer is prepared by: using a fluorine-containing polyimide nanofiber membrane with a thickness of 5-6 μm as a base material, spraying a nano-silicon dioxide / polytetrafluoroethylene composite coating with a particle size of 50 nm to form a micro-nano composite rough structure, wherein 2%-3% of nano-zinc oxide with a particle size of 30 nm and 1%-2% of graphene quantum dots are doped in the composite coating; The elastic support layer is prepared by elastic fibers and second organic conductive fibers through a three-dimensional knitting process. The close-to-body cool feeling layer is prepared by moisture-absorbing fibers, moisture-conducting and sweat-releasing fibers, and heat-conducting fibers, and is knitted by a jacquard plating process. The multifunctional integrated layer, the elastic support layer, and the close-to-body cool feeling layer are sequentially connected into an integral fabric through an ultrasonic bonding process.

[0010] In one of the embodiments, the heat storage and energy storage layer is prepared by: The 28-32tex phase change microcapsule modified fiber and the 16-20tex aerogel composite fiber are selected, and the first base yarn is formed by blending the two fibers in a mass ratio of 6:4 or 7:3; the first base yarn is used as a core yarn, and the first organic conductive fiber is wrapped outside to form the first conductive yarn; The air-jet loom is selected for weaving, and a double-layer weaving method is adopted to connect the surface yarn and the inner yarn through the connecting yarn, wherein the surface warp yarn and the surface weft yarn of the surface yarn both use the first base yarn, and one high-strength nylon filament and one first conductive yarn are embedded in the first base yarn at every preset distance of the surface warp yarn and the surface weft yarn frame to form a tear-resistant grid; the inner warp yarn and the inner weft yarn of the inner yarn both use the first base yarn, and one first conductive yarn is embedded in the first base yarn at every preset distance of the inner warp yarn and the inner weft yarn frame to form a satin weave; The preparation of the multifunctional composite layer includes: The fluorine-containing polyimide nanofiber membrane is laid on a spraying table, and the nano-silicon dioxide / polytetrafluoroethylene composite coating is uniformly coated by using electrostatic spraying technology, and the coating thickness is 1-2μm; after spraying, it is cured in a 120℃ oven for 10min to make the composite coating firmly combined with the fluorine-containing polyimide nanofiber membrane, forming a micro-nano composite rough structure; The nano zinc oxide and graphene quantum dot dispersion liquid are introduced into the composite coating through the padding process, and the rolling rate is 60%, and then it is pre-dried at 80℃ for 5min and baked at 150℃ for 3min to make the nano particles embedded in the composite coating network; On the side combined with the heat storage and energy storage layer, a water-based polyurethane / nano-silver composite adhesive is coated to form a bonding transition layer, and the coating thickness is 10μm, and it is dried at 60℃ for 5min, wherein the solid content of the water-based polyurethane / nano-silver composite adhesive is 40% and contains 0.5%-1% nano-silver with a particle size of 10nm.

[0011] In one of the embodiments, the preparation steps of the phase change microcapsule modified fiber include: The n-octadecane is encapsulated in the polyurea-polyurethane composite capsule wall under the condition that the phase change temperature is 25-30℃ by using the melt encapsulation method to prepare phase change microcapsules with a diameter of 5-10μm, and then the microcapsules are fixed on the surface of the polyester-based or nylon-based yarn through the padding-drying process, and the microcapsule loading amount is controlled at 15%-20%.

[0012] In one of the embodiments, the preparation of the elastic support layer includes: Core-spun yarn: the graphene composite fiber and the seaweed-based elastic fiber are point-netted, and then the shape memory polyurethane fiber is used as a core yarn, and the graphene composite fiber and the seaweed-based elastic fiber composite yarn are wrapped outside, and the twist is selected as 60-80 twists per 10cm; Cover yarn: the core-spun yarn is used as a core yarn, and the second organic conductive fiber is used as a sheath yarn, and the sheath yarn is spirally wrapped on the surface of the core yarn by compressed air to form the second conductive yarn. The core-spun yarn is twisted and set to form a blended yarn with a linear density of 11-14 tex, which is heat set at 100 DEG C x 15 min to eliminate internal stress and avoid shrinkage during weaving; The double jacquard circular machine is selected for weaving, and a double jacquard spacer knitting structure is adopted, wherein the double layer includes a surface layer and a bottom layer, the surface layer and the bottom layer both adopt weft plain stitches + floats, the middle connecting layer of the surface layer and the bottom layer adopts a loop column structure, the yarn of the core-spun yarn vertically connects the surface layer and the bottom layer, and one second conductive yarn is woven every 5 mm.

[0013] In one embodiment, the preparation of the close-fitting cool layer includes: The single jacquard circular weft machine is selected for weaving a single jacquard plating stitch; a double-hole staggered guide design is adopted, the plating guide hole is 0.5 mm lower than the ground yarn guide hole, to ensure that the plating yarn is always located on the front of the fabric; in order to avoid that the plating yarn is covered by the ground yarn or unevenly exposed during knitting, a special arc-shaped jaw sinker is selected. The moisture absorption and coolness core area: the plating yarn completely covers the ground yarn, the flat knitting plating stitch is adopted, the ground yarn forms a float behind the needle, to ensure that the moisture absorption area on the close-fitting side is maximized; The moisture conduction channel area: the partial plating stitch is adopted, the ground yarn is exposed to form a longitudinal moisture conduction stripe, the width is 2-3 mm, and the capillary effect of the ground yarn is used to conduct the sweat in the moisture absorption area to the outside; The heat dissipation enhancement area: the mesh plating stitch is adopted, the ground yarn forms a false rib mesh, the aperture is 0.5 mm, and the plating yarn is only connected at the edge of the mesh to increase the contact area with the air on the outside, and cooperate with the jade fiber to accelerate heat dissipation; The overall structure: the loop density is 320 / cm 2 , the thickness is 0.8-1.0 mm, to ensure light and thin fitting; The ground yarn is the outside functional layer, adopts 150D-200D COOLMXA fiber, and bears the moisture conduction and sweat removal functions; the plating yarn is the close-fitting side functional layer, selects moisture absorption fiber and heat conduction fiber, forms mixed plating yarn through blending and twisting, and the linear density is smaller than that of the ground yarn; the linear density ratio of the ground yarn to the plating yarn is 1.5:1-2:1, and the plating yarn coverage is greater than or equal to 95%.

[0014] As can be seen from the technical scheme provided by the above embodiments of the present specification, the scheme: adopts a multi-layer fabric composite method, so that the fabric has coolness, antibacterial, anti-ultraviolet, heat storage, elasticity, moisture absorption and ventilation, waterproof and self-cleaning functions, and the composite performance is stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only represent some of the embodiments described in the present specification, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The structure diagram of the elastic multi-layer structure composite fabric provided by the present application is shown. DETAILED DESCRIPTION

[0017] In order to enable the person skilled in the art to better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be described clearly and completely in the following with reference to the drawings in the embodiments of the present specification. Obviously, the described embodiments only represent some of the embodiments described in the present specification, rather than all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present specification.

[0018] In the following description, specific details such as specific system structures, techniques, etc. are presented in order to thoroughly understand the embodiments of the present application, but it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details that hinder the description of the present application.

[0019] Many modifications and changes can be made to the specific implementation of the present specification without departing from the scope or spirit of the present application, which will be apparent to those skilled in the art. Other implementations derived from the present specification will be apparent to those skilled in the art. The present specification and examples are only exemplary.

[0020] As used herein, "include", "includes" and "including" are open-ended terms that mean "including but not limited to".

[0021] The "parts" in the present application are measured by mass unless otherwise specified.

[0022] The present application will be further described in detail below with reference to the drawings and examples.

[0023] Reference Figure 1 which shows a structure diagram of the elastic multi-layer structure composite fabric provided by the embodiments of the present application.

[0024] As Figure 1As shown, the elastic multi-layer structure composite fabric includes a multifunctional integrated layer 1, an elastic support layer 2, and a close-to-body cool layer 3 connected in a laminated composite manner; the close-to-body cool layer 3 is the side in contact with the skin; The multifunctional integrated layer 1 includes a heat storage and energy storage layer 11 and a multifunctional composite layer 12; the multifunctional composite layer 12 is bonded to the surface of the heat storage and energy storage layer 11.

[0025] Specifically, the elastic multi-layer structure composite fabric is sequentially arranged from outside to inside as the multifunctional integrated layer 1, the elastic support layer 2, and the close-to-body cool layer 3, and each layer is connected through a specific process.

[0026] The heat storage and energy storage layer 11 can adjust the thermal environment, including absorbing and releasing energy, preventing thermal interference from the external environment, and actively heating on demand. The multifunctional composite layer 12 contains waterproof, self-cleaning, and anti-ultraviolet properties. The elastic support layer 2 is woven through a three-dimensional knitting process, and has elastic support, functionality (antibacterial and conductive), and three-dimensional structure stability. The close-to-body cool layer 3 aims to provide instant and lasting cool comfort when in contact with the skin.

[0027] The elastic multi-layer structure composite fabric provided by the embodiment has the functions of coolness, antibiosis, anti-ultraviolet, heat storage, elasticity, moisture absorption and air permeability, waterproof and self-cleaning, and is suitable for fields such as work clothes, outdoor sports clothes, military combat clothes, medical rehabilitation supplies, and extreme environment protection equipment.

[0028] In one embodiment, the heat storage and energy storage layer 11 is a tear-resistant grid made of phase change microcapsule modified fibers, aerogel composite fibers, and first organic conductive fibers; wherein, according to the mass percentage, the phase change microcapsule modified fibers account for 62-72%, the aerogel composite fibers account for 26-35%, and the first organic conductive fibers account for 2-3%. The phase change microcapsule modified fibers are made of polyester fibers or polyamide fibers. The aerogel composite fibers are made of a polyacrylonitrile matrix. The first organic conductive fibers are made of polyamide-based conductive fibers or polyester-based conductive fibers. The first organic conductive fibers are black silk with a core-sheath structure.

[0029] In one embodiment, the multifunctional composite layer 12 includes a micro-nano composite rough structure formed by taking a fluorine-containing polyimide nanofiber membrane as a substrate and a nano-silicon dioxide / polytetrafluoroethylene as a composite coating; wherein, 2%-3% of nano-zinc oxide with a particle size of 30 nm and 1%-2% of graphene quantum dots are doped in the composite coating. The multifunctional composite layer 12 is coated with a bonding transition layer on the side combined with the heat storage and energy storage layer 11; the bonding transition layer is made of a water-based polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 0.5%-1% of nano-silver with a particle size of 10 nm.

[0030] In one embodiment, the elastic support layer 2 comprises: 97-98% of elastic fiber and 2-3% of second organic conductive fiber; The elastic fiber adopts at least one of shape memory polyurethane fiber, graphene composite elastic fiber, seaweed-based elastic biofiber, spandex fiber. The second organic conductive fiber adopts at least one of polyamide-based conductive fiber and polyester-based conductive fiber. The second organic conductive fiber adopts black silk with a core-sheath structure.

[0031] In one embodiment, the close-fitting cool feeling layer 3 comprises: 35-43% of moisture-absorbing fiber, 28-32% of moisture-conducting and sweat-repelling fiber, and 29-33% of heat-conducting fiber. The moisture-absorbing fiber adopts at least one of lyocell fiber, modal, cotton fiber and bamboo fiber. The moisture-conducting and sweat-repelling fiber adopts at least one of COOLMXA fiber and COOLPLUS fiber. The heat-conducting fiber adopts jade fiber.

[0032] The application also provides a preparation method of the elastic multi-layer structure composite fabric, comprising the following steps: Step 1, preparing a multifunctional integrated layer, including preparing a heat storage and energy storage layer and preparing a multifunctional composite layer, wherein the preparation of the heat storage and energy storage layer comprises: mixing and spinning phase change microcapsule modified fiber and aerogel composite fiber to form first base yarn, and then wrapping the first base yarn with first organic conductive fiber to form first conductive yarn; adopting a lattice structure design with double-axial reinforcement to weave a tear-resistant grid on a jet loom.

[0033] Specifically, the preparation of the heat storage and energy storage layer comprises: 1) raw material blending ① Raw material selection: 28-32tex phase change microcapsule modified fiber and 16-20tex aerogel composite fiber are selected and blended at a mass ratio of 6:4 or 7:3 to form first base yarn, and the first base yarn is wrapped with first organic conductive fiber to form first conductive yarn, so that the conductive layer can be exposed on the surface, the contact resistance is low, an efficient charge discharge path is established, and static electricity accumulation is quickly eliminated, thereby avoiding the harm caused by static discharge.

[0034] The phase change microcapsule modified fiber provides active adjustment capability for heat storage and energy storage. It can automatically adjust the cool feeling / heat storage function according to the environmental temperature, and switches to the cool feeling mode above 25℃.

[0035] The preparation steps of the phase change microcapsule modified fiber comprise: The phase change microcapsules with a diameter of 5-10 μm are prepared by encapsulating n-octadecane in a polyurea-polyurethane composite capsule wall at a phase change temperature of 25-30℃ using a melt encapsulation method, and then fixed on the surface of polyester-based or nylon-based yarns through a padding-drying process, and the microcapsule loading is controlled at 15%-20%. In order to avoid the damage and sublimation of the microcapsules in the spinning solution due to the high melt spinning temperature and high spinning speed, the phase change microcapsule modified fiber is subjected to high temperature resistance treatment to produce a reserved expansion space in the microcapsule wall, which improves the uniformity of the microcapsule particle size distribution and enhances the high temperature resistance of the microcapsules.

[0036] When the ambient temperature changes, the phase change microcapsule modified fiber absorbs or releases heat through solid-liquid phase change, so that the temperature of the fabric is maintained in the comfortable range, and the single heat storage time can reach 4-6 hours. The base yarn is selected from ultra-fine denier polyester or high-strength nylon, which further reduces the overall weight of the fabric.

[0037] The aerogel composite fiber enhances heat insulation through porous structure, and cooperates with the phase change microcapsule modified fiber to improve the heat storage efficiency.

[0038] ②The spinning process is: The two fibers (phase change microcapsule modified fiber and aerogel composite fiber) are mixed in proportion by two passes of drawing frame, the first pass of drawing frame is set to 12×15 mm, and the draft ratio is 5-6 times; the second pass of drawing frame is further leveled, the roller gauge is set to 13×16 mm, and the draft ratio is 6-7 times, so as to ensure the uniformity of blending (weight unevenness <3%). Then the roving machine is processed, the roving weight is 5g / 10m, and the twist factor is 80-85. A new type of spinning device is selected, the spindle speed is 11000-12000 r / min, the twist is 650-680 twists / meter, and 19.7×2-23.6×2 tex blended yarn is prepared.

[0039] 2) Anti-tear lattice weaving The air-jet loom is selected for weaving, and a double-layer weaving method is adopted (in which the double-layer weaving method refers to a double-layer structure of fabric organization, and an upper and lower two layers + an interlayer connection composite structure formed by interweaving two groups of independent yarns of the surface layer yarn and the inner layer yarn through weaving technology). The surface layer yarn and the inner layer yarn are connected through the connecting yarn with a connecting interval of 5 mm to enhance the structural stability of the thickness direction of the fabric, and the thickness is controlled within 0.8-1.0 mm. The connecting yarn can ensure that the upper and lower layers are tightly combined and are not separated or deformed. In which, the surface layer adopts a lattice structure design with double-axial reinforcement of the warp and weft, and the surface warp yarn and the surface weft yarn of the surface layer yarn both use the first base yarn, and 150-200D high-strength nylon filament is embedded as a reinforcing rib in the lattice frame. In the surface warp yarn and the surface weft yarn frame, every preset distance (every 10 or 20) of the first base yarn is embedded with 1 high-strength nylon filament and 1 first conductive yarn to form a 5*5mm or 10*10mm square anti-tear lattice; the inner warp yarn and the inner weft yarn of the inner layer yarn both use the first base yarn, and every preset distance of the first base yarn in the inner warp yarn and the inner weft yarn frame is embedded with 1 first conductive yarn to form a satin weave. The warp tension is monitored in real time during the weaving process, and the tension fluctuation is kept within ≤±2cN to avoid lattice deformation caused by uneven tension.

[0040] The preparation of the multifunctional composite layer includes: taking fluorine-containing polyimide nanofiber film with a thickness of 5-6μm as a substrate, spraying nano-silicon dioxide / polytetrafluoroethylene composite coating with a particle size of 50nm to form a micro-nano composite rough structure, wherein 2%-3% of nano-zinc oxide with a particle size of 30nm and 1%-2% of graphene quantum dots are doped in the composite coating.

[0041] Specifically, the preparation of the multifunctional composite layer includes: 1) Material selection ① Waterproof self-cleaning material: fluorine-containing polyimide nanofiber film is used as a substrate with a thickness of 5-6μm, and the surface energy is as low as 16mN / m. The nano-silicon dioxide / polytetrafluoroethylene composite coating (particle size 50nm) is sprayed to form a micro-nano composite rough structure. The coating constructs a convex structure similar to a lotus leaf on the surface of the fiber film, with a water contact angle >160° and a rolling angle <5°, realizing super-hydrophobic performance. At the same time, the photocatalytic activity of the nano-particles can decompose oil stains to achieve self-cleaning (stain removal rate ≥98%).

[0042] ② Anti-ultraviolet material: 2%-3% of nano-zinc oxide and 1%-2% of graphene quantum dots are doped in the composite coating. Zinc oxide achieves protection by absorbing ultraviolet light (wavelength 280-320nm), and graphene quantum dots enhance the anti-ultraviolet effect through scattering, so that the integrated layer has an anti-ultraviolet performance UPF (Ultraviolet Protection Factor) value ≥50+, and the ultraviolet transmittance is <1%.

[0043] Nano zinc oxide / graphene quantum dot composite particles: nano zinc oxide has excellent photocatalytic activity, can produce strong oxidizing free radicals under ultraviolet irradiation, can decompose organic stains, realize self-cleaning function, and has high efficient absorption and scattering effect on ultraviolet rays, with protection index up to UPF50+, effectively blocking ultraviolet rays from penetrating the fabric. By compounding with graphene quantum dots with high thermal conductivity, not only the photocatalytic efficiency is improved, but also the combination of composite particles and fibers is enhanced by using the high specific surface area and quantum confinement effect of graphene quantum dots. Through hydrothermal synthesis method, the particle size of zinc oxide nanoparticles is controlled to be 25-30 nm, and the particle size of graphene quantum dots is 3-5 nm. After compounding, the composite particles are uniformly dispersed in the aqueous system under the action of dispersant, which is convenient for subsequent processing.

[0044] ③Adhesion transition layer: water-based polyurethane / nano-silver composite adhesive (solid content 40%) is selected, in which the content of nano-silver (particle size 10 nm) is 0.5-1%, which not only enhances the interlayer adhesion, but also endows the fabric with antibacterial properties, with a bacterial inhibition rate of ≥90%.

[0045] 2) Preparation process ①Nano coating spraying: the fluorinated polyimide nanofiber membrane is laid on the spraying table, and the nano-silicon dioxide / polytetrafluoroethylene composite coating is uniformly coated by using electrostatic spraying technology, and the coating thickness is 1-2 μm; after spraying, it is cured in a 120°C oven for 10 min, so that the composite coating is firmly combined with the fluorinated polyimide nanofiber membrane to form a micro-nano composite rough structure.

[0046] ②Ultraviolet protection function composite: nano zinc oxide and graphene quantum dot dispersion liquid are introduced into the composite coating by padding process, with a pick-up rate of 60%, and then pre-dried at 80°C for 5 min and baked at 150°C for 3 min, so that the nano particles are embedded in the composite coating network.

[0047] ③Transition layer coating: water-based polyurethane / nano-silver composite adhesive is coated on the side where the multifunctional composite layer and the heat storage and energy storage layer are combined, with a coating thickness of 10 μm, dried at 60°C for 5 min, to form an adhesion transition layer, which is convenient for subsequent compounding.

[0048] Step 2, prepare the elastic support layer by mixing the elastic fiber and the second organic conductive fiber through three-dimensional knitting process, which has elastic support, functionality (antibacterial, conductive) and three-dimensional structure stability.

[0049] Specifically, the preparation of the elastic support layer includes: 1) Raw material blending The raw materials are selected as follows: 20-30D graphene composite elastic fiber, 30-50D seaweed-based elastic fiber, 40D shape memory polyurethane fiber, and 20D second organic conductive fiber. The graphene composite fiber and the seaweed-based elastic fiber are point-woven at a ratio of 2:1 or 1:1, and the network points are 8-10 per meter. In order to maximize the elasticity of the yarn, the base yarn is selected in a core-sheath manner to form a sheath-core structure, that is, the shape memory polyurethane fiber is the core yarn, and the graphene composite fiber and the seaweed-based elastic fiber composite yarn are wrapped outside. The conductive yarn is selected in a wrapping manner, that is, the core-spun yarn is the core yarn, and the second organic conductive fiber is wrapped outside. The core-sheath + wrapping structure is selected, on the one hand, to maintain high elasticity, and the core yarn does not expose outside in a state of tension, which is convenient for later processing; on the other hand, the functions of the yarns are durable and effective.

[0050] The graphene composite elastic fiber is prepared by introducing graphene nanosheets into natural rubber or polyurethane elastomer as a matrix through in-situ polymerization or melt blending. It not only has excellent elastic recovery performance, but also has excellent electrical conductivity and thermal conductivity due to the presence of graphene, which can quickly conduct static electricity and heat inside the fabric, improving the comfort of wearing. At the same time, the addition of graphene also enhances the mechanical properties of the fiber, making the fabric more wear-resistant and aging-resistant.

[0051] The seaweed-based elastic biofiber is a new type of environmentally friendly and sustainable elastic material. With the whole process optimization of seaweed as raw material, polysaccharide extraction and purification, spinning solution elastic regulation, wet spinning forming, and post-treatment enhancement, through the addition of additives and crosslinking modification, the combination of natural polysaccharide and elastic performance can be realized, which is an environmentally friendly new type of elastic material. Seaweed is selected considering the polysaccharide content, growth environment (less impurities in low-salt seaweed), cost and sustainability (such as cultivating kelp is more easily scaled than wild seaweed). Pure seaweed polysaccharide fiber has poor elasticity and needs to be improved by adding additives, preferably natural elastic materials (such as gelatin, silk fibroin), which can improve the overall elasticity by using the flexibility of the molecular chain. This fiber has good biocompatibility and biodegradability, and can gradually decompose in the natural environment, reducing pollution to the environment. In addition, it has natural flame retardant performance and hemostatic and moisturizing properties, and can promote wound healing. LOI (Limit Oxygen Index) > 45%, without the need for flame retardants, it will not produce toxic gases under high temperature and direct fire. It can accelerate blood coagulation and scab formation rate; after absorbing the exudate, the fiber swells to form a soft gel, which protects the delicate new tissue and prevents secondary trauma when removing the gauze. Its elastic performance is slightly lower than that of graphene composite elastic fiber, and it has certain antibacterial performance, which is suitable for fields with high safety requirements.

[0052] Shape memory polyurethane fiber is a functional fiber with both polyurethane elasticity and shape memory effect, which can restore the preset "permanent shape" under external stimuli (such as heat, humidity, electric field, etc.). The shape memory performance of the fiber is due to the synergistic effect of the two-phase structure of the polyurethane molecular chain - the soft segment and the hard segment. By adjusting the composition, the memory temperature, mechanical properties, etc. can be changed.

[0053] Core-spun and air-coated spinning technology is used to realize uniform fiber composite: during spinning, the spinning speed, draft ratio and other parameters need to be controlled to ensure that the fineness, strength and elasticity of the yarn meet the requirements.

[0054] ②Spinning process Core-spun yarn: the shape memory polyurethane is selected with a draft ratio of 2.5-4 times, because a too low draft ratio will cause the shape memory polyurethane yarn to relax and the yarn elasticity to be insufficient; a too high draft ratio will easily cause the shape memory polyurethane to break or the yarn to be excessively crimped, affecting the weaving stability. First, the graphene composite fiber and the seaweed-based elastic fiber are point-netted, and then the shape memory polyurethane fiber is used as the core yarn, and the graphene composite fiber and the seaweed-based elastic fiber composite yarn are wrapped outside. The twist is selected to be 60-80 twists / 10 cm, and a too low twist will easily expose the core, and a too high twist will limit the elasticity of the yarn. The spindle speed is 11000-12000 r / min.

[0055] Coated yarn: using the core-spun yarn as the core yarn and the second organic conductive fiber as the sheath yarn, the sheath yarn is spirally wrapped around the core yarn surface by compressed air (pressure 0.3 MPa) to form the second conductive yarn. The conductive layer is exposed on the surface, the contact resistance is low, an efficient charge discharge path is established, and static electricity accumulation is quickly eliminated, thereby avoiding the harm caused by static discharge.

[0056] The core-spun yarn is twisted and set to form a blended yarn with a linear density of 11-14 tex, which is heat set at 100℃ for 15 min to eliminate internal stress and avoid shrinkage during weaving.

[0057] 2) Weaving process Double jacquard circular knitting machine is selected for weaving, and double jacquard interval needle structure is adopted. The double face includes a surface layer and a bottom layer, both of which use weft plain stitch + float stitch to provide planar tensile elasticity. The middle connecting layer of the surface layer and the bottom layer uses a loop column structure, which is vertically connected to the surface layer and the bottom layer by the yarn of the core-spun yarn to form a 3-4 mm thick three-dimensional support space to improve the compression and rebound performance. Every 5 mm, a second conductive yarn is woven.

[0058] The weaving process is an advanced weaving process that uses multi-axial weaving technology to form a three-dimensional network structure on the fabric. Compared with traditional flat weaving process, the elastic layer fabric prepared by double jacquard spacer knitting structure has higher structural stability and elastic durability. During the weaving process, the structure formed by the interweaving of yarns can uniformly disperse external force, and when the fabric is stretched, the yarns in all directions can jointly bear the tension, thereby improving the elastic recovery rate of the fabric. At the same time, the three-dimensional structure also gives the fabric good air permeability and loftiness, improving the comfort of wearing.

[0059] Step 3, preparing the close-to-skin cool layer, which is a weft-knitted fabric made of moisture-absorbing fibers, moisture-conducting and sweat-wicking fibers, and heat-conducting fibers using a jacquard plating process. This process designs precise zoning through jacquard plating, enabling the weft-knitted fabric to simultaneously have close-to-skin moisture absorption, one-way moisture conduction, and rapid heat dissipation functions. Moreover, the elasticity and skin-friendliness of the knitted fabric are more optimal, making it suitable as a close-to-skin cool layer.

[0060] Specifically, the preparation of the close-to-skin cool layer includes: 1) Raw material blending ① Raw material selection The moisture-conducting fiber is preferably COOLMXA fiber with a fineness of 150D-200D, and the moisture-absorbing fiber is preferably lyocell fiber and bamboo fiber. The two are blended at a ratio of 6:4, and then blended with the heat-conducting fiber to form a yarn with a fineness of 9.8-11.8 tex.

[0061] The COOLMXA fiber has a preferred four-groove cross-section structure. This structure increases the surface area of the fiber, and compared with ordinary round fibers, the sweat absorption speed is 2 times faster. The four-groove structure also allows for larger spaces between fibers, ensuring good air permeability. The main performance characteristics are: a. Rapid sweat absorption: The special cross-sectional structure of COOLMAX fiber can quickly "absorb" the sweat on the skin surface into the fiber interior through capillary effect, avoiding the sticky feeling of the skin.

[0062] b. Effective moisture conduction: The grooves on the fiber are arranged along the longitudinal direction of the fiber, forming a moisture conduction channel that "conducts" the absorbed sweat in the fiber to the surface of the fabric, preventing the accumulation of sweat in the fiber, and allowing the moisture to quickly leave the skin surface.

[0063] c. Accelerate sweat evaporation: Due to the larger specific surface area of COOLMAX fiber compared to ordinary round cross-section fibers of the same fineness, when the sweat is discharged to the surface of the fiber fabric, it can quickly evaporate into the surrounding atmosphere. In addition, the increased contact area between the fiber and the air, as well as the "air gap" between the fibers, helps the sweat to quickly "spread into a thin film" and evaporate, thereby achieving efficient sweat-wicking function.

[0064] Hygroscopic fibers are preferably lyocell and bamboo fibers, both complementary advantages, after blending has the following advantages: a. Hygroscopicity: synergistic effect, far more than single fiber The porous structure and hydrophilic groups of the two fibers form a "hygroscopic network" that can respond more quickly to humidity changes and still maintain a high moisture absorption capacity in a high humidity environment, avoiding the feeling of stuffiness due to insufficient moisture absorption; the transmission path of water between fibers is more unobstructed, both quickly absorbing sweat on the skin surface and quickly evaporating through the pores on the fabric surface, achieving an efficient cycle of "moisture absorption-conduction-evaporation", reducing the residue of sweat on the skin surface, and keeping the skin dry; even after absorbing a large amount of moisture, the fabric still maintains a certain degree of loftiness and air permeability, avoiding the problem of pure bamboo fiber fabric that becomes heavy after absorbing too much moisture, or the problem of pure lyocell fabric that feels slightly sticky in a high humidity environment.

[0065] b. Other synergistic advantages: The blended fabric has a soft and sticky touch, and when in contact with the skin, it has a small friction, combined with excellent moisture absorption, which can reduce the discomfort caused by sweat adhesion; the antibacterial properties of bamboo fiber prevent the fabric from becoming a breeding ground for bacteria in a humid environment after absorbing moisture, keeping the fabric clean and hygienic to wear; the high strength of lyocell can compensate for the lack of strength of bamboo fiber in the wet state, reducing damage and pilling of the fabric due to stress after absorbing moisture, and prolonging the service life; both retain the environmental properties of natural fibers and reduce the limitations of single fibers through performance complementation, in line with the trend of green textiles.

[0066] Thermal conductive fibers are preferably jade fibers, jade fibers use nanoscale jade powder spinning technology to integrate jade microcrystals into the fibers, the addition amount of jade powder should be moderate, usually 10%-20%, too high will increase the brittleness of the fiber and reduce the breaking strength; too low will not have enough functionality. To enhance the coolness of jade fiber, a micro-porous structure or a special cross-section is formed during the spinning process through process optimization.

[0067] The high thermal conductivity and high specific heat capacity of natural jade, combined with process optimization (changing the fiber structure), can quickly transfer human heat and improve heat dissipation efficiency, resulting in an immediate and lasting cool experience when in contact with the skin. At the same time, jade fiber also has certain antibacterial properties, which can inhibit the growth of some bacteria.

[0068] ②Yarn configuration a. Ground yarn (outer functional layer): mainly 150D-200D COOLMXA fiber, responsible for moisture transfer and sweat release, the sweat generated from the skin surface is transferred to the fabric plane direction through the grooves, keeping the garment close to the skin dry and comfortable to wear.

[0069] b. Plating (functional layer on the side of the body): It bears the functions of moisture absorption and heat conduction, and is made of moisture-absorbing fibers and heat-conducting fibers, which are twisted together to form a mixed plating with a slightly smaller linear density than the ground yarn, so as to ensure that the plating can tightly cover the ground yarn to form a layer close to the body and avoid the rough feeling caused by the direct contact of the ground yarn with the skin.

[0070] c. Artistic adaptability: The linear density ratio of the ground yarn to the plating is controlled at 1.5:1-2:1, so as to ensure that the plating can smoothly cover the ground yarn without being exposed, and the coverage rate of the plating is greater than or equal to 95%.

[0071] 2) Weaving process A single-jacquard circular weft machine is selected to weave a single-jacquard plating organization; a double-hole staggered guide design is adopted, and the plating guide hole is 0.5 mm lower than the ground yarn guide hole, so as to ensure that the plating is always located on the front of the fabric (the side close to the body); in order to avoid the plating being covered by the ground yarn or unevenly exposed during weaving, a sinker with a special arc-shaped jaw is selected; Moisture-absorbing cool core area: The plating completely covers the ground yarn, and the ground yarn forms a floating line behind the needle to ensure that the moisture-absorbing area on the side close to the body is maximized; Moisture-conducting channel area: Partial plating organization is adopted to expose the ground yarn to form longitudinal moisture-conducting stripes with a width of 2-3 mm, which utilize the capillary effect of the ground yarn to conduct the sweat in the moisture-absorbing area to the outside; Heat-dissipating enhancement area: Mesh plating organization is adopted, and the ground yarn forms a false rib mesh with a pore size of 0.5 mm, and the plating is only connected at the edge of the mesh to increase the contact area with the air, which cooperates with the jade fiber to accelerate heat dissipation; Overall structure: Loop density 320 / cm 2 , thickness 0.8-1.0 mm, to ensure light and thin fit.

[0072] Step 4, the multifunctional integrated layer, the elastic support layer and the body-cooling layer are connected into a whole fabric through the ultrasonic bonding process. The ultrasonic hot melting technology is used to bond each fabric layer directly, on the one hand, without traditional sewing or glue, reducing the weight and avoiding thread friction on the skin; on the other hand, the edge is firm and flat, with strong tear resistance, suitable for the compounding of elastic fabric.

[0073] Compared with the prior art, the present application has the following advantages: 1. Multifunctional collaborative design: through "multifunctional integrated layer-elastic support layer-body-cooling layer", the functions are complementary and the performance is optimized.

[0074] 2. Complex environment adaptability: the fabric can automatically adjust the cooling / heat storage function according to the environmental temperature, and the heat storage mode is started below 25℃, and the cooling mode is switched above 25℃.

[0075] 3. High elastic recovery: new elastic fiber is used to achieve 96% elastic recovery rate, and there is no permanent deformation after tens of thousands of cycle stretching.

[0076] 4. Multifunctional integrated coating: the outer waterproof coating has the functions of anti-ultraviolet and self-cleaning.

[0077] In summary, the elastic multi-layer structure composite fabric provided by the application has multiple functions such as cool feeling, antibacterial, anti-ultraviolet, heat storage, elasticity, moisture absorption and ventilation, waterproofness, self-cleaning and the like. From the outside to the inside, the elastic multi-layer structure composite fabric includes a multifunctional integrated layer, an elastic support layer and a close-to-body cool layer in sequence, is connected into an integral fabric by using ultrasonic bonding process, and the layers are reasonably connected with each other and have wearability. Moreover, after multiple washing, the fabric layers will not become loose, and the elasticity and functionality are basically not affected, so the elastic multi-layer structure composite fabric is suitable for fields such as work clothes, outdoor sports clothes, military combat clothes, medical rehabilitation supplies and extreme environment protection equipment.

[0078] Embodiment 1 The elastic multi-layer structure composite fabric includes a multifunctional integrated layer, an elastic support layer and a close-to-body cool layer which are sequentially stacked and connected.

[0079] The heat storage and energy storage layer is a tear-resistant grid which is woven by phase change microcapsule modified fibers, aerogel composite fibers and first organic conductive fibers.

[0080] The multifunctional composite layer includes a micro-nano composite rough structure formed by taking fluorine-containing polyimide nanofiber membrane as a base material and nanosilica / polytetrafluoroethylene as a composite coating, wherein 2% of 30 nm nano-zinc oxide and 2% of graphene quantum dots are doped in the composite coating. The multifunctional composite layer is coated with a bonding transition layer on the side combined with the heat storage and energy storage layer, and the bonding transition layer is an aqueous polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 0.5% of 10 nm nano-silver.

[0081] The elastic support layer includes 98% of elastic fibers and 2% of second organic conductive fibers, wherein the elastic fibers are shape memory polyurethane fibers, graphene composite elastic fibers and seaweed-based elastic biological fibers, and the second organic conductive fibers are nylon-based conductive fibers.

[0082] The close-to-body cool layer includes 40% of moisture-absorbing fibers, 30% of moisture-conducting and sweat-releasing fibers and 30% of heat-conducting fibers, wherein the moisture-absorbing fibers are lyocell fibers and bamboo fibers, the moisture-conducting and sweat-releasing fibers are COOLMXA fibers, and the heat-conducting fibers are jade fibers.

[0083] The preparation of the above-mentioned elastic multi-layer structure composite fabric specifically includes the following steps: Preparation of heat storage and energy storage layer: 1) Raw material selection Select 28 tex polyester fiber and 20 tex silica aerogel with 25% aerogel content and polyacrylonitrile matrix, mix them in a mass ratio of 6:4 to form the first base yarn, and then use the first base yarn as the core yarn and wrap it with 20D / 3f nylon-based conductive fiber to form the first conductive yarn. The total composition of the fabric is 65% phase change microcapsule modified fiber, 33% aerogel composite fiber, and 2% nylon-based conductive fiber.

[0084] The preparation method of the phase change microcapsule modified fiber is as follows: using the melt encapsulation method, octadecane with a phase change temperature of 26℃ is encapsulated in the polyurea-polyurethane composite capsule wall to prepare phase change microcapsules with a diameter of 7μm, and then the microcapsules are fixed on the surface of the polyester-based yarn through the padding-drying process. The microcapsule loading is controlled at 15%.

[0085] 2) Spinning process: two passes of drawing are carried out on the drawing frame, the first pass mixes the two fibers in proportion, the roller gauge is set to 12x15mm, and the draft ratio is 5 times; the second pass further levels the fibers, the roller gauge is 13x16mm, and the draft ratio is 6 times, to ensure the uniformity of the blended yarn (weight unevenness <3%). Then the yarn is processed through the roving machine, the roving weight is 5g / 10m, and the twist factor is 80. A new type of spinning device is selected, the spindle speed is 11500r / min, and the twist is 660 twists per meter, to produce 20x2tex blended yarn.

[0086] 3) Anti-tear check weaving Air-jet loom is selected for weaving, double-layer structure is adopted, the surface yarn and the inner yarn are connected by connecting yarn, the connecting interval is 5mm, and the thickness is controlled at 0.8mm. The surface yarn adopts a lattice structure design with double-axis reinforcement, both the surface warp yarn and the surface weft yarn use the above-mentioned blended yarn base yarn, and 150D high-strength nylon filament is embedded in the lattice frame as reinforcing rib. Among them, every 10 blended yarns in the warp and weft frames are embedded with 1 high-strength nylon filament and 1 conductive yarn to form a 5x5mm square anti-tear lattice. The inner warp yarn and the inner weft yarn also use the above-mentioned blended yarn, and every 10 blended yarns in the warp and weft frames are embedded with 1 conductive yarn to form a 5x5mm satin weave.

[0087] Preparation of multifunctional composite layer: 1) Nano coating spraying: fluorine-containing polyimide nanofiber film is laid on the spraying table with a thickness of 5μm, and a 50nm particle size silica / polytetrafluoroethylene composite coating is uniformly coated by using electrostatic spraying technology, and the coating thickness is controlled at 1μm. After spraying, it is cured in a 120℃ oven for 10min to make the composite coating firmly combined with the fiber film.

[0088] 2) UV protection function composite: 2% of 30 nm particle size zinc oxide and 2% of 3 nm particle size graphene quantum dot dispersion liquid are introduced into the composite coating through the padding process, the pick-up rate is 60%, and then it is pre-dried at 80°C for 5 min and baked at 150°C for 3 min, so that the nanoparticles are embedded in the coating network.

[0089] 3) Transition layer coating: a 40% solid content and containing 0.5% 10 nm particle size water-based polyurethane / mi silver adhesive is coated on the side of the multifunctional composite layer combined with the heat storage and energy storage layer, the coating thickness is 10 μm, and it is dried at 60°C for 5 min to form a sticky transition layer, which is convenient for subsequent compounding.

[0090] The multifunctional composite layer is compounded on the surface of the heat storage and energy storage layer.

[0091] Preparation of elastic support layer: 1) Raw material selection 20D graphene composite elastic fiber, 40D seaweed-based elastic biological fiber, 40D shape memory polyurethane fiber, and 20D / 3f nylon-based conductive fiber are selected as raw materials. The graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven at a ratio of 2:1, and the network points are 10 / m. The core-in-sheath method is used for the base yarn to form a skin-core structure, i.e. the shape memory polyurethane fiber is the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. The conductive yarn is formed by wrapping the core yarn with the nylon-based conductive fiber. The total composition of the fabric is: 45% graphene composite elastic fiber, 45% seaweed-based elastic biological fiber, 8% shape memory polyurethane fiber, and 2% nylon-based conductive fiber.

[0092] 2) Spinning process ① Core-in-sheath yarn: first, the graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven, then the shape memory polyurethane fiber is used as the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. Key parameter selection: the shape memory polyurethane fiber is selected with a draft ratio of 3 times; the twist of the core-in-sheath yarn is selected as 60 twists / 10 cm, and the spindle speed is 11000 r / min.

[0093] ② Coated yarn: the core-in-sheath yarn is used as the core yarn, and the nylon-based conductive fiber is wrapped outside to form a conductive yarn. The nylon-based conductive fiber is spirally wrapped on the surface of the core yarn by compressed air (pressure 0.3 MPa).

[0094] ③ By twisting and setting, a blended yarn with a linear density of 13 tex is formed, which is heat set at 100°C for 15 min to eliminate internal stress and avoid shrinkage during weaving.

[0095] 3) Weaving process Double jacquard circular machine is selected, and double jacquard interval knitting structure is adopted. The surface layer and the bottom layer are both weft plain knitting + float line organization, which provides planar tensile elasticity; the middle connecting layer adopts loop column structure, which is connected with the surface layer and the bottom layer by the above-mentioned yarn vertically, forming a three-dimensional support space with a thickness of 3mm, which improves the compression resilience performance. Every 5mm, a conductive yarn is woven.

[0096] Preparation of close-fitting cool layer: 1) Raw material selection Moisture-wicking fiber selects 150D COOLMXA fiber, moisture-absorbing fiber selects lyocell fiber and bamboo fiber, and is blended in a ratio of 4:6, and then is blended with jade fiber into 11.8tex yarn, and the total composition of the fabric is: 30% COOLMXA, 24% lyocell fiber, 16% bamboo fiber, and 30% jade fiber.

[0097] 2) Yarn configuration ①Ground yarn (outer functional layer): mainly using 150D COOLMXA fiber to undertake moisture-wicking function, the sweat generated from the skin surface is transmitted to the plane direction of the fabric by the groove, keeping the dry state of the close-fitting surface of the garment, effectively improving the wearing comfort of the garment.

[0098] ②Add yarn (close-fitting side functional layer): undertakes moisture absorption and heat conduction function, selects moisture-absorbing fiber and heat-conducting fiber, and forms mixed add yarn through blending and twisting, and the linear density is slightly smaller than that of the ground yarn, so as to ensure that the add yarn can tightly cover the ground yarn to form a close-fitting layer, avoiding the rough feeling caused by the direct contact of the ground yarn with the skin.

[0099] ③Artistic adaptability: the linear density ratio of the ground yarn and the add yarn is controlled at 1.5:1, so as to ensure that the add yarn can smoothly cover the ground yarn without being exposed, and the add yarn coverage rate is ≥95%.

[0100] 3) Weaving process Single jacquard circular weft machine is selected, and single jacquard add yarn organization is woven. Double-hole staggered guide design is adopted, and the add yarn guide hole is 0.5mm lower than the ground yarn guide hole, so as to ensure that the add yarn is always located on the front surface of the fabric (close-fitting side); in order to avoid that the add yarn is covered by the ground yarn or unevenly exposed during knitting, special arc-shaped jaw sinkers are selected.

[0101] Moisture-absorbing cool core area: the add yarn completely covers the ground yarn, and the flat knitting add yarn organization is adopted, and the ground yarn forms a float line behind the needle, so as to ensure that the moisture absorption area of the close-fitting side is maximized; Moisture-wicking channel area: adopts partial add yarn organization, exposes the ground yarn to form longitudinal moisture-wicking stripes, the width is 2mm, and the capillary effect of the ground yarn is used to conduct the sweat in the moisture absorption area to the outside; Heat dissipation enhancement zone: adopts "net eye plating" organization, ground yarn forms false rib net eye, aperture 0.5mm, plating only connects at the edge of the net eye, increases the contact area of the outside with air, cooperates with jade fiber to accelerate heat dissipation; Overall structure: loop density 320 / cm 2 , thickness 1.0mm, ensure light and thin fit.

[0102] The above three layers of fabric are connected into a whole fabric by ultrasonic bonding process.

[0103] The elastic multilayer structure composite fabric prepared in Example 1 is tested by using the technical requirements, test methods of FZ / T 70006-2022, GB / T 35263-2017, GB 12014-2019, GB / T 21655.2-2019, etc. The performance parameters are shown in Table 1: Table 1 Fabric comprehensive performance

[0104] Example 2 The elastic multilayer structure composite fabric includes a multifunctional integrated layer, an elastic support layer, and a close-to-body cool layer connected in sequence. The multifunctional integrated layer includes a heat storage and energy storage layer and a multifunctional composite layer.

[0105] The heat storage and energy storage layer is made of a tear-resistant grid composed of phase change microcapsule modified fibers, aerogel composite fibers, and first organic conductive fibers. The phase change microcapsule modified fibers are made of polyamide fibers, the aerogel composite fibers are made of polyacrylonitrile matrix, and the first organic conductive fibers are made of polyester-based conductive fibers.

[0106] The multifunctional composite layer includes a micro-nano composite rough structure formed by using fluorine-containing polyimide nanofiber membrane as base material and nanosilica / polytetrafluoroethylene as composite coating. In the composite coating, 3% of 30nm particle size nanometer zinc oxide and 1% of graphene quantum dots are doped. The multifunctional composite layer is combined with the heat storage and energy storage layer on one side, and a bonding transition layer is coated. The bonding transition layer is made of water-based polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 1% of 10nm particle size nano-silver.

[0107] The elastic support layer includes 97% of elastic fibers and 3% of second organic conductive fibers. The elastic fibers are made of shape memory polyurethane fibers, graphene composite elastic fibers, and seaweed-based elastic biological fibers, and the second organic conductive fibers are made of polyester-based conductive fibers.

[0108] The close-to-body cool layer comprises 35% hygroscopic fiber, 32% moisture-wicking fiber and 33% heat-conducting fiber; wherein the hygroscopic fiber adopts lyocell fiber and bamboo fiber; the moisture-wicking fiber adopts COOLMXA fiber, and the heat-conducting fiber adopts jade fiber.

[0109] The preparation of the above elastic multi-layer structure composite fabric specifically comprises the following steps: Preparation of the heat storage and energy storage layer: 1) Raw material selection Select 32tex polyamide fiber and 18tex silica aerogel composite fiber with 30% silica aerogel content and polyacrylonitrile matrix, and blend them in a mass ratio of 7:3 to form the first base yarn. Take the first base yarn as the core yarn, and wrap it with 20D / 3f polyester-based conductive fiber to form the first conductive yarn. The total composition of the fabric is 62% phase change microcapsule modified fiber, 35% aerogel composite fiber and 3% polyester-based conductive fiber.

[0110] The preparation method of the phase change microcapsule modified fiber is as follows: using the melt encapsulation method, n-octadecane with a phase change temperature of 30℃ is encapsulated in the polyurea-polyurethane composite capsule wall to prepare phase change microcapsules with a diameter of 10μm. Then, through the pad-dry-cure process, the phase change microcapsules are fixed on the surface of the polyamide-based yarn, and the microcapsule loading is controlled at 20%.

[0111] 2) Spinning process: two passes of drawing are carried out on the drawing frame. In the first pass, the two fibers are mixed in proportion, the roller gauge is set to 12x15mm, and the draft ratio is 5.5 times. In the second pass, the fibers are further leveled, the roller gauge is 13x16mm, and the draft ratio is 7 times, to ensure the uniformity of the blended yarn (weight unevenness <3%). Then, the yarn is processed through the roving machine, with a roving weight of 5g / 10m and a twist factor of 85. A new type of spinning device is selected, with a spindle speed of 12000r / min and a twist of 680 twists per meter, to produce 23x2tex blended yarn.

[0112] 3) Anti-tear check weaving Air-jet loom is selected for weaving, and a double-layer structure is adopted. The surface yarn and the inner yarn are connected by connecting yarn with a spacing of 5mm and a thickness of 0.8mm. The surface yarn adopts a lattice structure design with double-axial reinforcement, and the surface warp yarn and the surface weft yarn both use the above-mentioned blended yarn base yarn. At the same time, 200D high-strength polyamide filaments are embedded in the lattice frame as reinforcing bars. Among them, every 20 blended yarns in the warp and weft frames are embedded with 1 high-strength polyamide filament and 1 conductive yarn to form a 10x10mm square anti-tear lattice. The inner warp yarn and the inner weft yarn also use the above-mentioned blended yarn, and every 20 blended yarns in the warp and weft frames are embedded with 1 conductive yarn to form a 10x10mm satin weave.

[0113] Preparation of the multifunctional composite layer: 1) Nano-coating spraying: The fluoropolyimide nanofiber membrane is laid on the spraying table with a thickness of 6 μm. The 50 nm particle size silica / tetrafluoroethylene composite coating is uniformly coated by electrostatic spraying technology, and the coating thickness is controlled at 2 μm. After spraying, it is cured in a 120°C oven for 10 minutes to make the composite coating firmly combined with the fiber membrane.

[0114] 2) Anti-ultraviolet function composite: 3% of 30 nm particle size zinc oxide and 1% of 3 nm particle size graphene quantum dot dispersion liquid are introduced into the composite coating by padding process, with a rolling rate of 60%, followed by pre-drying at 80°C for 5 minutes and baking at 150°C for 3 minutes, so that the nanoparticles are embedded in the coating network.

[0115] 3) Transition layer coating: A 40% solid content water-based polyurethane / miraculous silver adhesive containing 1% 10 nm particle size is coated on the side of the multifunctional composite layer combined with the heat storage and energy storage layer, with a coating thickness of 10 μm, dried at 60°C for 5 minutes, forming a viscous transition layer, which is convenient for subsequent compounding.

[0116] The multifunctional composite layer is compounded on the surface of the heat storage and energy storage layer.

[0117] Preparation of elastic support layer: 1) Raw material selection 30D graphene composite elastic fiber, 50D seaweed-based elastic biological fiber, 40D shape memory polyurethane fiber, and 20D / 3f polyester-based conductive fiber are selected as raw materials. The graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven at a ratio of 1:1, with 8 network points per meter. The core-in-sheath method is used for the base yarn to form a skin-core structure, i.e., the shape memory polyurethane fiber is the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. The conductive yarn is wrapped in the form of a core-in-sheath yarn, i.e., the core-in-sheath yarn is the core yarn, and the polyester-based conductive fiber is wrapped outside to form a conductive yarn. The total composition of the fabric is: 55% graphene composite elastic fiber, 36% seaweed-based elastic biological fiber, 6% shape memory polyurethane fiber, and 3% polyester-based conductive fiber.

[0118] 2) Spinning process ① Core-in-sheath yarn: First, the graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven, then the shape memory polyurethane fiber is used as the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. Key parameter selection: the shape memory polyurethane fiber is selected with a draft ratio of 2.5 times; the twist of the core-in-sheath yarn is selected as 70 twists / 10 cm, and the spindle speed is 12000 r / min.

[0119] ② Coated yarn: The core-in-sheath yarn is used as the core yarn, and the polyester-based conductive fiber is wrapped outside. The polyester-based conductive fiber is spirally wrapped on the surface of the core yarn by compressed air (pressure 0.3 MPa) to form a conductive yarn.

[0120] ③ Through the twist setting, the blended yarn with 11 tex linear density is formed, and the internal stress is eliminated by heat setting at 100°C for 15 min to avoid shrinkage during weaving.

[0121] 3) Weaving process A double jacquard circular machine is selected, and a double jacquard spacer knitting structure is adopted. The surface layer and the bottom layer are both weft plain stitch + float stitch, providing planar tensile elasticity; the intermediate connecting layer adopts loop column structure, which is connected vertically to the surface layer and the bottom layer by the above-mentioned yarn, forming a 4mm thick three-dimensional support space to improve the compression and rebound performance. Every 5mm, a conductive yarn is woven in.

[0122] Preparation of the close-to-skin cool layer: 1) Raw material selection The moisture-wicking fiber is selected as 200D COOLPLUS fiber, the moisture-absorbing fiber is selected as modal and cotton fiber, and the blended yarn of 9.8 tex is formed by blending in a ratio of 4:6, and then blended with jade fiber. The total composition of the fabric is: 32% COOLPLUS fiber, 29% modal, 6% cotton fiber, and 33% jade fiber.

[0123] 2) Yarn configuration ① Ground yarn (outer functional layer): mainly using 200D COOLPLUS fiber to undertake moisture-wicking function, the sweat generated from the skin surface is transferred to the fabric plane direction through the groove, keeping the dry state of the close-to-skin surface of the garment, effectively improving the wearing comfort of the garment.

[0124] ② Plating yarn (close-to-skin functional layer): undertaking moisture absorption and heat conduction functions, selecting moisture-absorbing fiber and heat-conducting fiber, forming mixed plating yarn through doubling and twisting, and the linear density of the plating yarn is slightly smaller than that of the ground yarn, ensuring that the plating yarn can tightly cover the ground yarn to form a close-to-skin layer, avoiding the roughness caused by direct contact of the ground yarn with the skin.

[0125] ③ Artistic adaptability: the linear density ratio of the ground yarn to the plating yarn is controlled at 2:1, ensuring that the plating yarn can smoothly cover the ground yarn without being exposed, and the plating yarn coverage rate is ≥95%.

[0126] 3) Weaving process A single jacquard circular weft machine is selected to weave a single jacquard plating stitch. A double-hole staggered guide design is adopted, and the plating yarn guide hole is 0.5mm lower than the ground yarn guide hole, ensuring that the plating yarn is always located on the front surface of the fabric (close-to-skin side); in order to avoid the plating yarn being covered or unevenly exposed by the ground yarn during weaving, a special arc-shaped jaw sinker is selected.

[0127] Moisture-absorbing and cool core area: the plating yarn completely covers the ground yarn, and the ground yarn forms a float behind the needle to ensure that the moisture-absorbing area on the close-to-skin side is maximized; Moisture conducting channel area: Partial plating is used to expose the ground yarn to form longitudinal moisture conducting stripes with a width of 3mm, which utilizes the capillary effect of the ground yarn to conduct the sweat from the moisture absorbing area to the outside; Heat dissipation enhancement area: "Mesh plating" organization is used, and the ground yarn forms a false rib mesh with a pore size of 0.5mm. The plating is only connected at the edge of the mesh to increase the contact area with the air, and the jade fiber is used to accelerate heat dissipation. Overall structure: loop density 320 / cm 2 , thickness 0.8mm, to ensure light and thin fit.

[0128] The above three layers of fabric are connected into a whole fabric by ultrasonic bonding process.

[0129] Example 3 The elastic multi-layer structure composite fabric includes a multifunctional integrated layer, an elastic support layer, and a close-to-body cool feeling layer which are sequentially stacked and connected. The multifunctional integrated layer includes a heat storage and energy storage layer and a multifunctional composite layer.

[0130] The heat storage and energy storage layer is a tear-resistant grid woven from phase change microcapsule modified fibers, aerogel composite fibers, and first organic conductive fibers. The phase change microcapsule modified fibers are nylon fibers, the aerogel composite fibers are polyacrylonitrile matrices, and the first organic conductive fibers are polyester-based conductive fibers.

[0131] The multifunctional composite layer includes a micro-nano composite rough structure formed by using fluorine-containing polyimide nanofiber membrane as base material and nanometer silicon dioxide / polytetrafluoroethylene as composite coating. In the composite coating, 2.5% of 30nm particle size nanometer zinc oxide and 1.5% of graphene quantum dots are doped. The multifunctional composite layer is coated with a bonding transition layer on the side combined with the heat storage and energy storage layer. The bonding transition layer uses a water-based polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 1% of 10nm particle size nano-silver.

[0132] The elastic support layer includes 97% of elastic fibers and 3% of second organic conductive fibers. The elastic fibers are spandex fibers, graphene composite elastic fibers, and seaweed-based elastic biological fibers. The second organic conductive fibers are polyester-based conductive fibers.

[0133] The close-to-body cool feeling layer includes 43% of moisture-absorbing fibers, 28% of moisture-conducting and sweat-repelling fibers, and 29% of heat-conducting fibers. The moisture-absorbing fibers are lyocell fibers and bamboo fibers. The moisture-conducting and sweat-repelling fibers are COOLMXA fibers. The heat-conducting fibers are jade fibers.

[0134] The preparation of the above elastic multi-layer structure composite fabric includes the following steps: Preparation of the heat storage and energy storage layer: 1) Raw material selection Select 30 tex nylon fiber and 16 tex silica aerogel with 35% aerogel content and polyacrylonitrile matrix, blend at a mass ratio of 7:3 to form the first base yarn, use the first base yarn as the core yarn, wrap 20D / 3f polyester-based conductive fiber to form the first conductive yarn. The total composition of the fabric is 72% phase change microcapsule modified fiber, 26% aerogel composite fiber, and 2% polyester-based conductive fiber.

[0135] The preparation method of the phase change microcapsule modified fiber is: using the melt encapsulation method, the n-octadecane with a phase change temperature of 25℃ is encapsulated in the polyurea-polyurethane composite capsule wall to prepare phase change microcapsules with a diameter of 5μm, and then the microcapsules are fixed on the surface of the nylon-based yarn through the padding-drying process. The microcapsule loading is controlled at 18%.

[0136] 2) Spinning process: two passes of blending are carried out on the drawing frame, the first pass of blending mixes the two fibers in proportion, the roller gauge is set to 12x15mm, and the draft ratio is 5.5 times; the second pass of blending further levels the fibers, the roller gauge is 13x16mm, and the draft ratio is 7 times, ensuring uniformity of blending (weight unevenness <3%). Then process through the roving frame, roving weight 5g / 10m, twist factor 85. Select a new type of spinning device, spindle speed 12000r / min, twist 680 twists / meter, to make 23x2tex blended yarn.

[0137] 3) Anti-tear check weaving Select air-jet loom for weaving, adopt double-layer structure, the surface yarn and the inner layer yarn are connected by connecting yarn, the connecting interval is 5mm, and the thickness is controlled at 0.8mm. The surface yarn adopts the lattice structure design with double axial reinforcement, both the surface warp yarn and the surface weft yarn use the above blended yarn base yarn, and 200D high-strength nylon filament is embedded in the lattice frame as reinforcing rib. Among them, every 20 blended yarns in the warp and weft frames are embedded with 1 high-strength nylon filament and 1 conductive yarn to form a 10x10mm square anti-tear check. The inner warp yarn and the inner weft yarn also use the above blended yarn, and every 20 blended yarns in the warp and weft frames are embedded with 1 conductive yarn to form a 10x10mm satin weave.

[0138] Preparation of multifunctional composite layer: 1) Nano coating spraying: lay the fluorine-containing polyimide nanofiber membrane on the spraying table with a thickness of 6μm, use electrostatic spraying technology to uniformly coat the 50nm particle size silica / polytetrafluoroethylene composite coating, and control the coating thickness at 2μm. After spraying, solidify in a 120℃ oven for 10min to firmly bond the composite coating with the fiber membrane.

[0139] 2) UV protection function composite: 2.5% of 30nm particle size zinc oxide and 1.5% of 3nm particle size graphene quantum dot dispersion liquid are introduced into the composite coating through the padding process, the pick-up rate is 60%, and then it is pre-dried at 80°C for 5min and baked at 150°C for 3min, so that the nanoparticles are embedded in the coating network.

[0140] 3) Transition layer coating: a 40% solid content water-based polyurethane / micrometer silver adhesive containing 1% 10nm particle size is coated on the side where the multifunctional composite layer is combined with the heat storage and energy storage layer, the coating thickness is 10μm, and it is dried at 60°C for 5min to form a viscous transition layer, which facilitates subsequent compounding.

[0141] The multifunctional composite layer is compounded on the surface of the heat storage and energy storage layer.

[0142] Preparation of elastic support layer: 1) Raw material selection 30D graphene composite elastic fiber, 50D seaweed-based elastic biological fiber, 40D spandex fiber, and 20D / 3f polyester-based conductive fiber are selected as raw materials. The graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven at a ratio of 1:1, and the network points are 8 / m. The core-in-sheath method is used for the base yarn to form a skin-core structure, i.e., the spandex fiber is the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. The conductive yarn is formed by wrapping the polyester-based conductive fiber outside the core-in-sheath yarn. The total composition of the fabric is: 50% graphene composite elastic fiber, 40% seaweed-based elastic biological fiber, 7% spandex fiber, and 3% polyester-based conductive fiber.

[0143] 2) Spinning process ① Core-in-sheath yarn: first, the graphene composite elastic fiber and the seaweed-based elastic biological fiber are point-woven, then the spandex fiber is used as the core yarn, and the graphene composite elastic fiber and the seaweed-based elastic biological fiber composite yarn are wrapped outside. Key parameter selection: the spandex fiber is selected with a draw ratio of 4 times; the twist of the core-in-sheath yarn is selected as 80 twists / 10cm, and the spindle speed is 11500r / min.

[0144] ② Coated yarn: the core-in-sheath yarn is used as the core yarn, and the polyester-based conductive fiber is wrapped around it to form a conductive yarn. The polyester-based conductive fiber is spirally wrapped on the surface of the core yarn by compressed air (pressure 0.3MPa).

[0145] ③ Through twisting and setting, a blended yarn with a linear density of 14tex is formed, which is heat set at 100°C for 15min to eliminate internal stress and avoid shrinkage during weaving.

[0146] 3) Weaving process Double jacquard circular machine is selected, and double jacquard interval knitting structure is adopted. The surface layer and the bottom layer are both weft plain knitting + float line organization, which provides planar tensile elasticity; the middle connecting layer adopts loop column structure, which is connected with the surface layer and the bottom layer by the above-mentioned yarn vertically, forming a 4mm thick three-dimensional support space, and improving the compression resilience performance. Every 5mm, a conductive yarn is woven.

[0147] Preparation of close-fitting cool layer: 1) Raw material selection The moisture-wicking fiber selects 200D COOLMXA fiber, the moisture-absorbing fiber selects modal and cotton fiber, and the yarn of 10.8tex is spun by mixing them in a ratio of 4:6. The total composition of the fabric is: 28% COOLMXA fiber, 35% modal, 8% cotton fiber and 29% jade fiber.

[0148] 2) Yarn configuration ①Ground yarn (outer functional layer): mainly using 200D COOLMXA fiber to undertake moisture-wicking function, the sweat generated from the skin surface is transmitted to the plane direction of the fabric by the groove, keeping the dry state of the close-fitting surface of the garment, and effectively improving the wearing comfort of the garment.

[0149] ②Add yarn (close-fitting side functional layer): responsible for moisture absorption and heat conduction, selects moisture-absorbing fiber and heat-conducting fiber, forms mixed add yarn by doubling and twisting, and the linear density is slightly smaller than that of the ground yarn, to ensure that the add yarn can tightly cover the ground yarn to form a close-fitting layer, avoiding the rough feeling caused by direct contact of the ground yarn with the skin.

[0150] ③Artistic adaptability: the linear density ratio of the ground yarn and the add yarn is controlled at 2:1, to ensure that the add yarn can smoothly cover the ground yarn without being exposed, and the add yarn coverage rate is ≥95%.

[0151] 3) Weaving process Single jacquard circular weft machine is selected, and single jacquard add yarn organization is woven. Double-hole staggered guide design is adopted, and the add yarn guide hole is 0.5mm lower than the ground yarn guide hole, to ensure that the add yarn is always located on the front surface of the fabric (close-fitting side); in order to avoid the add yarn being covered or unevenly exposed by the ground yarn during knitting, special arc-shaped jaw sinkers are selected.

[0152] Moisture-absorbing cool core area: the add yarn completely covers the ground yarn, and the flat knitting add yarn organization is adopted, the ground yarn forms a float line behind the needle, to ensure that the moisture absorption area of the close-fitting side is maximized; Moisture-wicking channel area: partial add yarn organization is adopted, and the ground yarn is exposed to form longitudinal moisture-wicking stripes, with a width of 3mm, which utilizes the capillary effect of the ground yarn to conduct the sweat in the moisture absorption area to the outside; Heat dissipation enhancement area: adopts "mesh add yarn" organization, the ground yarn forms a false rib mesh with a pore size of 0.5mm, and the add yarn is only connected at the edge of the mesh, which increases the contact area between the outside and the air, and cooperates with the jade fiber to accelerate heat dissipation; Overall structure: coil density 320 per cm 2 , thickness 0.9mm, to ensure light and thin fit.

[0153] The above three layers of fabric are sequentially connected into an integrated fabric through ultrasonic bonding process.

[0154] It should be noted that the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus that includes the element.

[0155] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

Claims

1. A stretch multi-layer structure composite fabric, characterized in that, It comprises a multifunctional integrated layer (1), an elastic support layer (2) and a close-to-body cool layer (3) which are stacked in sequence and connected in a composite manner. The multifunctional integrated layer (1) comprises a heat storage and energy storage layer (11) and a multifunctional composite layer (12), and the multifunctional composite layer (12) is bonded to the surface of the heat storage and energy storage layer (11).

2. The stretch multi-layer structural composite fabric of claim 1, wherein, The heat storage and energy storage layer (11) is a tear-resistant grid woven from phase change microcapsule modified fibers, aerogel composite fibers and first organic conductive fibers, wherein the phase change microcapsule modified fibers account for 62-72% by mass percentage, the aerogel composite fibers account for 26-35% by mass percentage, and the first organic conductive fibers account for 2-3% by mass percentage. The phase change microcapsule modified fibers are polyester fibers or polyamide fibers. The aerogel composite fibers are polyacrylonitrile matrices. The first organic conductive fibers are polyamide-based conductive fibers or polyester-based conductive fibers.

3. The stretch multi-layer structural composite fabric of claim 1, wherein, The multifunctional composite layer (12) comprises a micro-nano composite rough structure formed by taking a fluorine-containing polyimide nanofiber membrane as a base material and a nano-silicon dioxide / polytetrafluoroethylene composite coating as a composite coating, wherein the composite coating is doped with 2-3% of 30 nm nano-zinc oxide and 1-2% of graphene quantum dots. The multifunctional composite layer (12) is coated with a bonding transition layer on the side combined with the heat storage and energy storage layer (11), and the bonding transition layer is an aqueous polyurethane / nano-silver composite adhesive with a solid content of 40% and containing 0.5-1% of 10 nm nano-silver.

4. The stretch multi-layer structural composite fabric of claim 1, wherein, The elastic support layer (2) comprises 97-98% of elastic fibers and 2-3% of second organic conductive fibers. The elastic fibers are at least one of shape memory polyurethane fibers, graphene composite elastic fibers, seaweed-based elastic biological fibers and spandex fibers. The second organic conductive fibers are at least one of polyamide-based conductive fibers and polyester-based conductive fibers.

5. The elastic multilayer composite fabric according to claim 1, characterized in that, The close-to-body cool layer (3) comprises 35-43% of hygroscopic fibers, 28-32% of moisture-conducting and sweat-repelling fibers and 29-33% of heat-conducting fibers. The hygroscopic fibers are at least one of lyocell fibers, modal fibers, cotton fibers and bamboo fibers. The moisture-conducting and sweat-repelling fibers are at least one of COOLMXA fibers and COOLPLUS fibers. The heat-conducting fibers are jade fibers.

6. A method of making the stretch multi-layer structure composite fabric according to any one of claims 1-5, characterized in that, It comprises: Preparation of a multifunctional integrated layer, including preparation of a heat storage and energy storage layer and preparation of a multifunctional composite layer, wherein the preparation of the heat storage and energy storage layer comprises: blending and spinning phase change microcapsule modified fibers and aerogel composite fibers to form first base yarn, and then wrapping the first base yarn with first organic conductive fibers to form first conductive yarn; and weaving a tear-resistant grid in a lattice structure design with double-axis reinforcement on a jet loom; the preparation of the multifunctional composite layer comprises: taking a fluorine-containing polyimide nanofiber membrane with a thickness of 5-6 μm as a base material, and spraying a nano-silicon dioxide / polytetrafluoroethylene composite coating with a particle size of 50 nm to form a micro-nano composite rough structure, wherein the composite coating is doped with 2-3% of 30 nm nano-zinc oxide and 1-2% of graphene quantum dots. An elastic support layer is prepared by weaving elastic fibers and a second organic conductive fiber using a three-dimensional knitting process. A close-fitting cooling layer is prepared by weaving moisture-absorbing fibers, moisture-wicking fibers, and heat-conducting fibers using a jacquard yarn-adding process. The multifunctional integrated layer, elastic support layer, and body-hugging cooling layer are sequentially bonded together using an ultrasonic bonding process to form a complete fabric.

7. The method for preparing the elastic multilayer composite fabric according to claim 6, characterized in that, The preparation of the thermal energy storage layer includes: 28-32tex phase change microcapsule modified fiber and 16-20tex aerogel composite fiber are selected and blended at a mass ratio of 6:4 or 7:3 to form the first base yarn. The first base yarn is used as the core yarn and wrapped with the first organic conductive fiber to form the first conductive yarn. The fabric is woven using an air-jet loom and a double-layer weaving method. The outer layer yarn and the inner layer yarn are connected by a connecting yarn. The outer layer yarn uses the first base yarn for both the outer warp and outer weft yarns. A high-strength nylon filament and a first conductive yarn are embedded in the first base yarn at predetermined intervals along the edges of the outer warp and outer weft yarns to form the tear-resistant grid. The inner layer yarn uses the first base yarn for both the inner warp and inner weft yarns. A first conductive yarn is embedded in the first base yarn at predetermined intervals along the edges of the inner warp and inner weft yarns to form a satin weave. The preparation of the multifunctional composite layer includes: Fluorinated polyimide nanofiber membranes are laid flat on a spraying station, and a nano-silica / polytetrafluoroethylene composite coating is uniformly applied using electrostatic spraying technology. The coating thickness is 1-2 μm. After spraying, the coating is cured in an oven at 120℃ for 10 min to ensure that the composite coating is firmly bonded to the fluorinated polyimide nanofiber membrane, forming a micro-nano composite rough structure. In this process, nano-zinc oxide and graphene quantum dot dispersions are introduced into the composite coating through a rolling process with a roll-out rate of 60%. The coating is then pre-dried at 80°C for 5 minutes and baked at 150°C for 3 minutes to embed the nanoparticles into the composite coating network. A water-based polyurethane / nano-silver composite adhesive is coated on the side where the multifunctional composite layer and the thermal energy storage layer are bonded. The coating thickness is 10 μm. After drying at 60°C for 5 min, an adhesive transition layer is formed. The water-based polyurethane / nano-silver composite adhesive has a solid content of 40% and contains 0.5%-1% nano-silver with a particle size of 10 nm.

8. The method for preparing the elastic multilayer composite fabric according to claim 7, characterized in that, The preparation steps of the phase change microcapsule modified fiber include: A melt-encapsulation method was used to encapsulate n-octadecane in a polyurea-polyurethane composite capsule wall at a phase change temperature of 25-30℃ to prepare phase change microcapsules with a diameter of 5-10μm. These microcapsules were then fixed onto the surface of polyester or nylon yarns through a padding-baking process, with the microcapsule loading controlled at 15%-20%.

9. The method for preparing the elastic multilayer composite fabric according to claim 6, characterized in that, The preparation of the elastic support layer includes: Core-spun yarn: Graphene composite fibers and seaweed-based elastic fibers are dotted together, and then shape memory polyurethane fibers are used as the core yarn, and graphene composite fibers and seaweed-based elastic fiber composite yarns are wrapped on the outside, with 60~80 twists / 10cm selected. Covered yarn: The core-spun yarn is used as the core filament and the second organic conductive fiber is used as the sheath filament. The sheath filament is spirally wrapped around the surface of the core filament by compressed air to form the second conductive yarn; The core yarn is twisted and set to form a blended yarn with a linear density of 11-14 tex, which is heat set at 100 DEG C for 15 minutes to eliminate internal stress and avoid shrinkage during weaving; The double jacquard circular machine is selected for weaving, and a double jacquard spacer knitting structure is adopted, wherein the double layer includes a surface layer and a bottom layer, the surface layer and the bottom layer are both weft plain stitches + floats, the middle connecting layer of the surface layer and the bottom layer adopts a loop column structure, the yarn of the core yarn is vertically connected to the surface layer and the bottom layer, and one second conductive yarn is knitted every 5 mm.

10. The method for preparing the elastic multilayer composite fabric according to claim 6, characterized in that, The preparation of the close-to-body cool layer includes: The single jacquard circular weft machine is selected for weaving a single jacquard plating structure; a double-hole staggered guide design is adopted, and the plating guide hole is 0.5 mm lower than the ground yarn guide hole to ensure that the plating is always located on the front of the fabric; in order to avoid that the plating is covered by the ground yarn or unevenly exposed during knitting, a special arc-shaped piece jaw sinker is selected; The moisture absorption and coolness core area: the plating completely covers the ground yarn, and the flat knitting plating structure is adopted, the ground yarn forms a float behind the needle to ensure that the moisture absorption area on the close-to-body side is maximized; The moisture conduction channel area: the partial plating structure is adopted, the ground yarn is exposed to form a longitudinal moisture conduction stripe with a width of 2-3 mm, and the capillary effect of the ground yarn is used to conduct the sweat in the moisture absorption area to the outside; The heat dissipation enhancement area: the mesh plating structure is adopted, the ground yarn forms a false rib mesh with a pore size of 0.5 mm, and the plating is only connected at the edge of the mesh to increase the contact area of the outside with air, which cooperates with the jade fiber to accelerate heat dissipation; Overall structure: coil density 320 per / cm 2 , thickness 0.8-1.0mm, ensure light and thin fit; The ground yarn is the outside functional layer, and the COOLMXA fiber with a fineness of 150D-200D is adopted to undertake the moisture conduction and sweat removal function; the plating is the close-to-body side functional layer, and the moisture absorption fiber and the heat conduction fiber are selected, the mixed plating is formed by blending and twisting, and the linear density is smaller than that of the ground yarn; the linear density ratio of the ground yarn to the plating is 1.5:1-2:1, and the plating coverage is greater than or equal to 95%.

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