Cooling composite shielding fabric, preparation method and application thereof

Abstract

The application provides a cooling composite shielding fabric, a preparation method and application thereof. The preparation method comprises the following steps: S1, a double-layer coated yarn is prepared by using metal wires, artificial fiber inner cores and natural fiber yarns, and a conductive cloth is obtained by weaving; S2, a cooling conductive layer is prepared; the cooling conductive layer has a first surface and a second surface arranged oppositely, and the cooling conductive layer comprises a radiation refrigeration layer and the conductive cloth which is arranged in the radiation refrigeration layer; S3, a flame-retardant protective layer is formed on the first surface of the cooling conductive layer; and S4, a knitted fabric base fabric is laminated on the second surface of the cooling conductive layer to obtain a composite cooling shielding fabric. The double-layer coated yarn structure of the metal wires, the artificial fiber inner cores and the natural fiber yarns, combined with the composite design of the radiation refrigeration layer and the flame-retardant protective layer, not only realizes the efficient conductive performance of the fabric, but also endows the fabric with excellent radiation refrigeration effect and protection performance.

Description

Technical Field

[0001] This invention relates to the field of functional fabrics, and more specifically, to a cooling composite shielding fabric, its preparation method, and its application. Background Technology

[0002] When conducting live-line maintenance work in special workplaces such as high-voltage transmission lines and converter stations, the work often needs to be carried out in environments with high temperatures and intense sunlight. To prevent potential electric shock injuries to workers from the electric field, they must wear protective suits. Protective suits are generally made of uniform conductive and fibrous materials, and are thick and relatively sealed to achieve sufficient shielding. However, due to the high-temperature working environment, workers' body temperature rises, sweating increases, and they are prone to dehydration, heatstroke, dizziness, palpitations, and other symptoms, which in turn reduces work efficiency and personnel safety. Common cooling work clothes on the market typically achieve cooling by adding fans, which are not suitable for personnel working on live lines in high-voltage transmission lines and converter stations.

[0003] Passive radiation cooling technology is a novel, energy-free, and emission-free cooling technology that utilizes the thermal radiation from an object's surface to directly dissipate heat, achieving a cooling effect below ambient temperature. This technology primarily relies on a specific wavelength range in the atmosphere—the 8-13 micrometer infrared window. This band has the lowest atmospheric radiation and the highest transmittance, making it the optimal channel for heat radiation dissipation from an object's surface. This technology effectively reflects sunlight, reducing the heat absorbed by the object, while simultaneously increasing the surface's thermal emissivity and improving heat dissipation efficiency. This technology allows for the optimization and improvement of shielding clothing fabrics, enabling them to simultaneously provide cooling and shielding, thus making them more suitable for various working environments.

[0004] Therefore, how to provide a new type of composite shielding fabric with cooling function that can take into account both cooling and electric field shielding functions, while also having excellent tear resistance, is one of the important technical problems that need to be solved in this field. Summary of the Invention

[0005] The main objective of this invention is to provide a cooling composite shielding fabric, its preparation method, and its application, so as to solve the problem that existing shielding clothing fabrics cannot simultaneously possess cooling function, electric field shielding effect, and excellent tear resistance.

[0006] To achieve the above objectives, the first aspect of the present invention provides a method for preparing a composite cooling and shielding fabric, comprising: step S1, winding metal wires around the outer surface of an artificial fiber core to form a metal wire-covered artificial fiber core, and then covering the outer surface of the metal wire-covered artificial fiber core with natural fiber yarn to obtain a double-layer covered yarn, which is then woven to obtain a conductive fabric; step S2, preparing a radiation cooling layer solution, immersing the conductive fabric in the radiation cooling layer solution, and obtaining a cooling and conductive layer after a first drying, wherein the cooling and conductive layer has a first surface and a second surface disposed opposite to each other, and the cooling and conductive layer includes a radiation cooling layer and conductive fabric interspersed within the radiation cooling layer; step S3, preparing a flame-retardant protective layer solution, coating the flame-retardant protective layer solution on the first surface of the cooling and conductive layer, and forming a flame-retardant protective layer on the first surface after a second drying; and step S4, laminating a knitted base fabric onto the second surface of the cooling and conductive layer to obtain a composite cooling and shielding fabric.

[0007] Furthermore, the synthetic fiber core is selected from one or more of spandex, rubber filaments and polyolefin fibers, and the specification of the synthetic fiber core is 1000D to 2000D; and / or, the metal wire is selected from one or more of stainless steel wire, copper wire and silver wire, and the diameter of the metal wire is 20μm to 50μm; and / or, the natural fiber yarn is selected from one or more of cotton yarn, wool yarn and linen yarn, and the specification of the natural fiber yarn is 20s / 2 to 40s / 2.

[0008] Further, by weight, the radiation cooling layer solution comprises 10-50 parts of polymer, 40-60 parts of organic solvent, 10-20 parts of inorganic nanoparticles, 1-10 parts of silane coupling agent, and 1-5 parts of first auxiliary agent; preferably, the inorganic nanoparticles are silica nanoparticles and / or zinc oxide nanoparticles.

[0009] Further, the polymer is selected from one or more of polyethyl methacrylate, polyacrylonitrile, and polyvinylidene fluoride-hexafluoropropylene; and / or, the organic solvent is N,N-dimethylformamide and / or acetone, preferably a mixed solvent of N,N-dimethylformamide and acetone, and the weight ratio of N,N-dimethylformamide and acetone is 1:(2-3); and / or, the first additive is selected from one or more of a first dispersant, a wetting agent, a first defoamer, an anti-cracking agent, and a film-forming aid.

[0010] Furthermore, in step S2, the immersion temperature is 50℃~55℃, and the liquid yield is 80%~90%; the first drying temperature is 55℃~60℃.

[0011] Further, by weight, the flame-retardant protective layer solution comprises 20 to 40 parts of flame retardant, 10 to 20 parts of reinforcing material, 40 to 50 parts of film-forming agent, and 1 to 5 parts of second auxiliary agent; preferably, the reinforcing material is selected from one or more of nano-titanium boride, nano-silica, and aramid fiber.

[0012] Further, the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, and cyclic phosphate flame retardants, wherein the cyclic phosphate flame retardant is selected from one or more of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, bisphenol A-bis(diphenyl phosphate), resorcinol, and trichloroethyl phosphate; and / or, the film-forming agent is acrylic resin and / or waterborne polyurethane; preferably, it is a mixture of acrylic resin and waterborne polyurethane, and the weight ratio of acrylic resin to waterborne polyurethane is (1.8 to 2.0):1; and / or, the second additive is selected from one or more of plasticizer, second defoamer, and second dispersant.

[0013] Furthermore, in step S3, the coating thickness is 50μm to 200μm; the second drying temperature is 60℃ to 65℃.

[0014] A second aspect of the present invention provides a composite cooling shielding fabric, which is prepared by the above-described method for preparing composite cooling shielding fabric.

[0015] A third aspect of the present invention provides an application of the above-mentioned composite cooling and shielding fabric as a shielding clothing fabric in the field of electrical engineering and power, wherein the shielding clothing includes a face mask, a shirt, trousers and gloves.

[0016] By applying the technical solution of this invention, a double-layered yarn structure consisting of a metal wire-wrapped synthetic fiber core and a natural fiber yarn, combined with a composite design of a radiation cooling layer and a flame-retardant protective layer, is achieved. This not only enables the fabric to achieve highly efficient electrical conductivity but also endows it with excellent radiation cooling effect and protective performance. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the composite cooling and shielding fabric provided in an embodiment of the present invention.

[0019] The labels represent the following:

[0020] 10. Knitted base fabric; 20. Cooling and conductive layer; 21. Radiative cooling layer; 22. Conductive fabric; 30. Flame retardant protective layer. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0022] As described in the background art, existing shielding clothing fabrics have the problem of not being able to simultaneously possess cooling function, electric field shielding effect, and excellent tear resistance. To address the aforementioned technical problems, the first aspect of this invention provides a method for preparing a composite cooling and shielding fabric, comprising: step S1, winding metal wires around the outer surface of a synthetic fiber core to form a metal wire-covered synthetic fiber core, and then covering the outer surface of the metal wire-covered synthetic fiber core with natural fiber yarn to obtain a double-layer covered yarn, which is then woven to obtain a conductive fabric; step S2, preparing a radiation cooling layer solution, immersing the conductive fabric in the radiation cooling layer solution, and obtaining a cooling and conductive layer after a first drying process, wherein the cooling and conductive layer has a first surface and a second surface disposed opposite to each other, and the cooling and conductive layer includes a radiation cooling layer and conductive fabric interspersed within the radiation cooling layer; step S3, preparing a flame-retardant protective layer solution, coating the flame-retardant protective layer solution on the first surface of the cooling and conductive layer, and forming a flame-retardant protective layer on the first surface after a second drying process; and step S4, laminating a knitted base fabric onto the second surface of the cooling and conductive layer to obtain a composite cooling and shielding fabric.

[0023] This invention utilizes a double-layered yarn structure, consisting of a metal wire-wrapped synthetic fiber core and a natural fiber yarn, combined with a composite design of a radiation cooling layer and a flame-retardant protective layer. This not only achieves highly efficient electrical conductivity in the fabric but also endows it with excellent radiation cooling effect and protective performance.

[0024] Specifically, for the conductive fabric formed by double-layered covered yarn, the presence of metal wires effectively enhances the conductivity of the layer and effectively shields electromagnetic radiation. Simultaneously, the composite of these metal wires with the synthetic fiber core and the natural fiber yarn, and their connecting effect between the two, effectively balances the mechanical properties, conductivity, and compatibility with the polymer solution in subsequent steps of the double-layered covered yarn and the resulting conductive fabric. This allows the conductive fabric to function as a suitable functional reinforcing skeleton within the radiation cooling layer, significantly improving the electric field shielding and cooling performance of the composite cooling and shielding fabric it belongs to.

[0025] Based on this, the present invention also provides an additional flame-retardant protective layer on one side surface of the cooling conductive layer. By utilizing the intrinsic protective function of the flame-retardant protective layer and its compatibility and synergistic effect with the cooling conductive layer, the comprehensive performance of the resulting composite cooling shielding fabric is further improved, so that it can not only take into account the cooling function, electric field shielding effect and excellent tear resistance, but also exhibit good protective and insulating performance.

[0026] In practical applications, the base fabric of knitted fabrics is generally pure cotton knitted fabric with sweat-absorbing and breathable functions. It can also be replaced with fabrics with embedded cooling factors, such as menthol fiber, or fabrics made of fiber materials with high thermal conductivity and specific heat capacity, such as polyester and nylon blends, or fabrics made of polyurethane fiber.

[0027] Of course, in addition to the intrinsic functions and properties of the layers prepared by the present invention, more importantly, through their excellent compatibility, the conductive fabric, radiation cooling layer, flame retardant protective layer and knitted base fabric can be used as a complete and continuous overall composite cooling and shielding fabric, thus exhibiting excellent comprehensive performance.

[0028] In several typical embodiments, the synthetic fiber core is selected from one or more of spandex, rubber filaments, and polyolefin fibers, and the synthetic fiber core has a specification of 1000D to 2000D; and / or, the metal wire is selected from one or more of stainless steel wire, copper wire, and silver wire, and the diameter of the metal wire is 20μm to 50μm; and / or, the natural fiber yarn is selected from one or more of cotton yarn, wool yarn, and linen yarn, and the specification of the natural fiber yarn is 20s / 2 to 40s / 2. The rubber filaments are elastic rubber filaments, and the polyolefin fibers are polyolefin elastic fibers. The preferred selection of the above-mentioned double-layer covered yarn raw materials can better improve the softness and comfort of the resulting conductive fabric, while also comprehensively improving its conductivity and liquid absorption. This allows it to be incorporated into the radiation cooling layer with a functionally enhanced skeleton that provides excellent electric field shielding, thereby effectively improving the electric field shielding performance and cooling capacity of the resulting composite cooling shielding fabric.

[0029] Furthermore, through extensive experimentation, the inventors have optimally determined that, by weight, the radiation cooling layer solution comprises 10-50 parts of polymer, 40-60 parts of organic solvent, 10-20 parts of inorganic nanoparticles, 1-10 parts of silane coupling agent, and 1-5 parts of a first auxiliary agent. This formulation yields a radiation cooling layer with superior radiation cooling performance. Simultaneously, when the radiation cooling layer with this formulation is combined with conductive fabric, the compatibility and synergy between the two are significantly improved, ultimately resulting in a composite cooling and shielding fabric with superior overall performance. Furthermore, the inorganic nanoparticles are preferably silica nanoparticles and / or zinc oxide nanoparticles, which, while enhancing the overall cooling capacity of the radiation cooling layer solution, also provide reinforcement, resulting in higher mechanical properties and stronger tear resistance in both the resulting cooling conductive layer and the composite cooling and shielding fabric.

[0030] In several typical embodiments, in order to further improve the uniformity and stability of the cured radiation cooling layer, thereby further improving the cooling effect and service life of the resulting fabric, the polymer is preferably selected from one or more of polyethyl methacrylate, polyacrylonitrile, and polyvinylidene fluoride-hexafluoropropylene; and / or, the organic solvent is N,N-dimethylformamide and / or acetone; and / or, the first auxiliary agent is selected from one or more of the first dispersant, wetting agent, first defoamer, anti-cracking agent, and film-forming aid.

[0031] Furthermore, the preferred organic solvent is a mixture of N,N-dimethylformamide and acetone, with a weight ratio of N,N-dimethylformamide to acetone of 1:(2-3). This organic solvent combination, optimized through extensive experimentation, can better promote the bonding of inorganic nanoparticles and polymers, as well as the overall composite of the radiation cooling layer and the conductive fabric, forming a denser cooling conductive layer and ultimately improving the cooling performance of the resulting composite cooling shielding fabric.

[0032] In practical applications, the primary dispersant can be of the following types: DisperBYK-111, Solsperse 24000, EfkaPX 4350, and TEGO Dispers 755W; the wetting agent can be of the following types: TEGO Wet 280, BYK-348, Surfynol 104, and Dynol 960; the primary defoamer can be of the following types: BYK-033, TEGO Airex 990, AFCONA-2722, and Tego Foamex 810; the anti-cratering agent can be of the following types: TEGO Glide 450, BYK-310, Modaflow Resin, and Borchi Gol 1470; and the film-forming aid can be of the following types: Texanol, OE-300, DPNB, and LOCA WI-6; however, the application is not limited to these types.

[0033] It should be explained in advance that padding is a textile processing technique. The steps include immersing the fabric in a solution to fully absorb it, and then passing the wetted fabric through rollers to remove excess solution and ensure the solution is evenly distributed on the fabric surface. The padding yield refers to the proportion of solution absorbed by the fabric during the padding process, and it is calculated using the formula: (Solution weight of the fabric after padding - Solution weight of the fabric before padding) / Solution weight of the fabric before padding × 100%.

[0034] Regarding step S2, in this invention, where the conductive fabric is impregnated into the radiative cooling layer, the inventors, through extensive experimentation, have optimized the impregnation temperature to be 50°C–55°C and the liquid-to-liquid ratio to be 80%–90%. This allows the radiative cooling layer solution to better wet the conductive fabric, resulting in a more uniform and stable cooling conductive layer, thereby improving the cooling performance of the resulting composite cooling shielding fabric. Furthermore, the preferred first drying temperature is 55°C–60°C to enhance the curing effect of the radiative cooling layer, promoting a tighter bond between it and the conductive fabric, ultimately serving as a crucial functional component to improve the overall performance of the resulting composite cooling shielding fabric.

[0035] In several typical embodiments, the flame-retardant protective layer solution comprises, by weight, 20-40 parts of flame retardant, 10-20 parts of reinforcing material, 40-50 parts of film-forming agent, and 1-5 parts of a second auxiliary agent. The addition of the flame-retardant protective layer with the above formulation, upon curing, not only improves the flame-retardant properties of the resulting fabric but also better integrates with the already formed cooling and conductive layer, synergistically enhancing the mechanical properties of the resulting composite cooling and shielding fabric, especially its tear resistance.

[0036] In order to further improve the tear resistance of the resulting fabric, the reinforcing material is preferably selected from one or more of nano-titanium boride, nano-silica, and aramid fibers.

[0037] Furthermore, the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, and cyclic phosphate flame retardants, wherein the cyclic phosphate flame retardant is selected from one or more of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), bisphenol A-bis(diphenyl phosphate) (BDP), resorcinol (RDP), and trichloroethyl phosphate (TCEP); and / or, the film-forming agent is acrylic resin and / or waterborne polyurethane; and / or, the second auxiliary agent is selected from one or more of plasticizer, second defoamer, and second dispersant. The components of the above types can better cooperate, thereby providing superior flame retardant protection and mechanical reinforcement without affecting the breathability and comfort of the fabric.

[0038] Based on this, in order to form a more resilient and flexible flame-retardant protective layer, thereby improving the tear resistance of the resulting fabric and optimizing its fit, the inventors, through extensive experiments, selected a mixture of acrylic resin and waterborne polyurethane as the film-forming agent, with a weight ratio of acrylic resin to waterborne polyurethane of (1.8 to 2.0):1.

[0039] In practical applications, plasticizers such as diisononyl phthalate (DINP), dioctyl terephthalate (DOTP), dioctyl phthalate (DOP), and trioctyl trimellitate (TOTM) can be selected; secondary defoamers such as TEGO Airex 902W, BYK-1790, AFCONA-2020, and TEGO Foamex N can be selected; and secondary dispersants such as DisperBYK-180, TEGO Dispers 670, Solsperse 20000, and Efka FA 4611 can be selected; however, the selection is not limited to the above-mentioned types.

[0040] In several typical embodiments, the coating thickness in step S3 is preferably 50 μm to 200 μm, and the second drying temperature is 60°C to 65°C. This control of process parameters improves the structural uniformity and stability of the cured flame-retardant protective layer, reduces performance degradation caused by excessively thick or thin coatings, and the aforementioned second drying temperature setting more effectively promotes the curing of the flame-retardant protective layer material and its bonding with the cooling conductive layer, forming a tight overall structure, thereby further improving the flame retardancy and mechanical strength of the resulting fabric.

[0041] A second aspect of the present invention provides a composite cooling and shielding fabric, which is prepared by the method described above. The resulting fabric not only possesses excellent electrical conductivity, effectively shielding electromagnetic radiation and protecting electrical workers from electromagnetic harm, but its composite design of a radiative cooling layer and a flame-retardant protective layer also provides effective cooling and flame-retardant protection in high-temperature environments.

[0042] A third aspect of the present invention provides an application of the above-mentioned composite cooling and shielding fabric as a shielding clothing fabric in the field of electrical engineering and power, wherein the shielding clothing includes a face mask, a shirt, trousers and gloves.

[0043] This invention utilizes a double-layered yarn structure consisting of a metal wire-covered synthetic fiber core and a natural fiber yarn, combined with a composite design of a radiative cooling layer and a flame-retardant protective layer. This results in a fabric that simultaneously possesses excellent radiative cooling, electric field shielding, and tear resistance. When used as a shielding suit fabric in the electrical and power industries, it can effectively reduce the body temperature of workers in high-temperature environments, improving their comfort and safety. Furthermore, because the composite cooling shielding fabric provided by this invention has good flame retardancy and mechanical strength, it significantly improves work efficiency and protection levels.

[0044] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0045] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0046] Example 1

[0047] A method for preparing a composite cooling and shielding fabric:

[0048] Step S1: Prepare conductive fabric using pure cotton yarn (20s / 2), stainless steel wire (30μm diameter), and spandex elastic yarn (1500D). The method involves using 1500D spandex elastic yarn as the core layer, evenly winding the stainless steel wire around the spandex yarn to form an inner covering layer, and then evenly winding 20s / 2 pure cotton yarn around the spandex elastic yarn and stainless steel wire to form an outer covering layer. The warp direction uses low-elasticity pure cotton yarn, and the weft direction uses the resulting double-layer covering yarn. The fabric is woven using a twill (two-up, two-down) weave structure to obtain the conductive fabric.

[0049] Step S2: Preparation of the radiation cooling layer solution: The materials used are polymer: polyacrylonitrile (30% by mass), organic solvent: N,N-dimethylformamide / acetone (weight ratio 3:7, total mass fraction 45%), additive: zinc oxide nanoparticles (15% by mass), interface agent: KF-550 (5% by mass), and auxiliary agents: 1% first dispersant DisperBYK-111, 1% wetting agent TEGOWet280, 1% first defoamer BYK-033, 1% anti-cracking agent TEGO Glide40, and 1% film-forming aid OE-300 (total mass fraction 5%).

[0050] Impregnation: At room temperature, the radiation cooling layer solution is stirred for 10 hours using a stirrer. Then, the conductive fabric is immersed in the radiation cooling layer solution at a temperature of 50°C and a roll-off rate of 80%. After that, it is dried at high temperature (60°C) to obtain a cooled conductive layer, which includes the cured radiation cooling layer and the conductive fabric interspersed inside the radiation cooling layer.

[0051] Step S3: Prepare the flame-retardant protective layer solution: The materials used are: flame retardant: magnesium hydroxide (30% by mass), reinforcing material: nano silica (15% by mass), film-forming agent: acrylic resin / waterborne polyurethane (weight ratio 2:1, total mass fraction 45%), additives: 0.6% plasticizer DINP, 0.7% secondary defoamer TEGO Airex902W, and 0.7% secondary dispersant DisperBYK-180 (total 2%).

[0052] Coating: At room temperature, the flame retardant protective layer solution is stirred for 10 hours using a stirrer. Then, the flame retardant protective layer solution is coated on one side surface of the cooling conductive layer with a coating thickness of 150μm. After that, it is dried at high temperature (60℃) to obtain a semi-finished composite layer formed by the flame retardant protective layer and the cooling conductive layer.

[0053] Step S4: Using a coating machine, uniformly apply polyurethane adhesive AH-1704-1 to the surface of the cooling and conductive layer (excluding the flame-retardant protective layer) to a thickness of 0.15 mm. Then, initially press the sweat-wicking and breathable knitted base to the semi-finished composite layer. Next, use a hot air oven at 70°C for 45 minutes to fully cure the adhesive. Finally, rinse, dry, roll, and cut into the desired shape to obtain the composite cooling and shielding fabric. Its structural diagram is shown below. Figure 1 As shown.

[0054] Example 2

[0055] A method for preparing a composite cooling and shielding fabric:

[0056] Step S1: Prepare conductive fabric using pure cotton yarn (30s / 2), copper wire (30μm diameter), and spandex elastic yarn (1000D). The method involves using 1000D spandex elastic yarn as the core layer, evenly winding copper wire around the spandex yarn to form an inner covering layer, and then evenly winding 30s / 2 pure cotton yarn around the spandex elastic yarn and copper wire to form an outer covering layer. The warp direction uses low-elasticity pure cotton yarn, and the weft direction uses the obtained double-layer covering yarn. A twill (two-up, two-down) weave structure is used to obtain the conductive fabric.

[0057] Step S2: Preparation of the radiation cooling layer solution: The materials used are polymer: polyvinylidene fluoride-hexafluoropropylene (mass fraction 30%), organic solvent: N,N-dimethylformamide / acetone (weight ratio 3:7, total mass fraction 40%), additive: silica nanoparticles (mass fraction 15%), interface agent: KF-550 (mass fraction 8%), and auxiliary agents: 0.4% primary dispersant Solsperse 24000, 0.4% wetting agent TEGO Wet 280, 0.4% primary defoamer BYK-033, 0.4% anti-cracking agent BYK-310, and 0.4% film-forming aid Texanol (total mass fraction 2%).

[0058] Impregnation: At room temperature, the radiation cooling layer solution is stirred for 10 hours using a stirrer. Then, the conductive fabric is immersed in the radiation cooling layer solution at a temperature of 50°C and a roll-off rate of 80%. After that, it is dried at high temperature (60°C) to obtain a cooled conductive layer, which includes the cured radiation cooling layer and the conductive fabric interspersed inside the radiation cooling layer.

[0059] Step S3: Prepare the flame-retardant protective layer solution: The materials used are: flame retardant: cyclic phosphate flame retardant TCEP (mass fraction 35%), reinforcing material: nano titanium boride (mass fraction 15%), film-forming agent: acrylic resin / waterborne polyurethane (weight ratio 2:1, total mass fraction 45%), additives: 0.6% plasticizer DOP, 0.7% secondary defoamer BYK-1790, 0.7% secondary dispersant TEGO Dispers 670 (total 2%).

[0060] Coating: At room temperature, the flame retardant protective layer solution is stirred for 10 hours using a stirrer. Then, the flame retardant protective layer solution is coated on one side surface of the cooling conductive layer with a coating thickness of 200μm. After that, it is dried at high temperature (60℃) to obtain a semi-finished composite layer formed by the flame retardant protective layer and the cooling conductive layer.

[0061] Step S4: Using a coating machine, uniformly apply polyurethane adhesive AH-1704-1 to the surface of the cooling and conductive layer (without the flame-retardant protective layer) to a thickness of 0.15 mm. Then, initially press the sweat-wicking and breathable knitted base to the semi-finished composite layer. Next, use a hot air oven at 70°C for 45 minutes to fully cure the adhesive. Finally, rinse, dry, roll, and cut into the desired shape to obtain the composite cooling and shielding fabric.

[0062] Example 3

[0063] A method for preparing a composite cooling and shielding fabric:

[0064] Step S1: Prepare conductive fabric using pure cotton yarn (25s / 2), silver wire (25μm diameter), and spandex elastic yarn (2000D). The method involves using 2000D spandex elastic yarn as the core layer, evenly winding the silver wire around the spandex yarn to form an inner covering layer, and then evenly winding the 25s / 2 pure cotton yarn around the spandex elastic yarn and silver wire to form an outer covering layer. The warp direction uses low-elasticity pure cotton yarn, and the weft direction uses the obtained double-layer covering yarn. The fabric is woven using a twill (two-up, two-down) structure to obtain the conductive fabric.

[0065] Step S2: Preparation of the radiation cooling layer solution: The materials used are polymer: polyethyl methacrylate (35% by mass), organic solvent: N,N-dimethylformamide / acetone (weight ratio 3:7, total mass fraction 40%), additive: silica nanoparticles (15% by mass), interface agent: KF-550 (7% by mass), and auxiliary agents: 0.6% first dispersant Efka PX 4350, 0.6% wetting agent BYK-348, 0.6% first defoamer AFCONA-2722, 0.6% anti-cracking agent BYK-310, and 0.6% film-forming aid DPNB (total mass fraction 3%).

[0066] Impregnation: At room temperature, the radiation cooling layer solution is stirred for 10 hours using a stirrer. Then, the conductive fabric is placed in the radiation cooling layer solution for impregnation at a temperature of 50°C and a liquid-to-liquid ratio of 90%. After that, it is dried at high temperature (60°C) to obtain a cooled conductive layer, which includes the cured radiation cooling layer and the conductive fabric interspersed inside the radiation cooling layer.

[0067] Step S3: Prepare the flame-retardant protective layer solution: The materials used are: flame retardant: magnesium hydroxide (CAS No. 1309-42-8, mass fraction 25%), reinforcing material: aramid fiber (mass fraction 20%), film-forming agent: acrylic resin / waterborne polyurethane (weight ratio 2:1, total mass fraction 40%), additives: 1.6% plasticizer TOTM, 1.7% secondary defoamer TEGO FoamexN, 1.6% secondary dispersant Solsperse 20000 (total 5%).

[0068] Coating: At room temperature, the flame retardant protective layer solution is stirred for 10 hours using a stirrer. Then, the flame retardant protective layer solution is coated on one side surface of the cooling conductive layer with a coating thickness of 50 μm. After that, it is dried at high temperature (60℃) to obtain a semi-finished composite layer formed by the flame retardant protective layer and the cooling conductive layer.

[0069] Step S4: Using a coating machine, uniformly apply polyurethane adhesive AH-1704-1 to the surface of the cooling and conductive layer (without the flame-retardant protective layer) to a thickness of 0.15 mm. Then, initially press the sweat-wicking and breathable knitted base to the semi-finished composite layer. Next, use a hot air oven at 70°C for 45 minutes to fully cure the adhesive. Finally, rinse, dry, roll, and cut into the desired shape to obtain the composite cooling and shielding fabric.

[0070] Example 4

[0071] A method for preparing a composite cooling and shielding fabric:

[0072] The only difference between this embodiment and Embodiment 1 is that the material performance parameters used to prepare the conductive fabric are different. Specifically, the materials used are pure cotton yarn (15s / 2), stainless steel wire (diameter 60μm), and spandex elastic thread (500D).

[0073] Example 5

[0074] A method for preparing a composite cooling and shielding fabric:

[0075] The only difference between this embodiment and Embodiment 1 is that the material performance parameters used to prepare the conductive fabric are different. Specifically, the materials used are pure cotton yarn (45s / 2), stainless steel wire (15μm in diameter), and spandex elastic thread (2500D).

[0076] Example 6

[0077] A method for preparing a composite cooling and shielding fabric:

[0078] The only difference between this embodiment and Example 1 is the mass fraction of the materials used to prepare the radiation cooling layer solution. Specifically: polymer: polyacrylonitrile (5% by mass), organic solvent: N,N-dimethylformamide / acetone (weight ratio 3:7, total mass fraction 65%), additive: zinc oxide nanoparticles (5% by mass), interface agent: KF-550 (15% by mass), and auxiliary agents: 2% dispersant, 2% wetting agent, 2% defoamer, 2% anti-cracking agent, and 2% film-forming aid (total mass fraction 10%).

[0079] Example 7

[0080] A method for preparing a composite cooling and shielding fabric:

[0081] The only difference between this embodiment and Example 1 is the mass fraction of the materials used to prepare the radiation cooling layer solution. Specifically: polymer: polyacrylonitrile (55% by mass), organic solvent: N,N-dimethylformamide / acetone (weight ratio 3:7, total mass fraction 20%), additive: zinc oxide nanoparticles (24% by mass), interface agent: KF-550 (0.5% by mass), and auxiliary agents: 0.1% dispersant, 0.1% wetting agent, 0.1% defoamer, 0.1% anti-cracking agent, and 0.1% film-forming aid (total mass fraction 0.5%).

[0082] Example 8

[0083] A method for preparing a composite cooling and shielding fabric:

[0084] The only difference between this embodiment and Embodiment 1 is that the padding conditions in step S2 are different. Specifically, the conductive fabric is placed in a radiation cooling layer solution for padding at a temperature of 40°C and a padding rate of 95%, and then dried at a high temperature (50°C) to obtain a cooled conductive layer.

[0085] Example 9

[0086] A method for preparing a composite cooling and shielding fabric:

[0087] The only difference between this embodiment and embodiment 1 is that the impregnation conditions in step S2 are different. Specifically, the conductive fabric is impregnated in a radiation cooling layer solution at a temperature of 60°C and a liquid-to-liquid ratio of 75%, and then dried at a high temperature (65°C) to obtain a cooled conductive layer.

[0088] Example 10

[0089] A method for preparing a composite cooling and shielding fabric:

[0090] The only difference between this embodiment and Example 1 is the mass fraction of the materials used to prepare the flame-retardant protective layer solution. Specifically, the materials are: magnesium hydroxide (64.7% by mass), reinforcing material: nano-silica (0% by mass), film-forming agent: acrylic resin / waterborne polyurethane (weight ratio 2:1, total mass fraction 35%), and additives: 0.1% plasticizer, 0.1% defoamer, and 0.1% dispersant (total 0.3%).

[0091] Example 11

[0092] A method for preparing a composite cooling and shielding fabric:

[0093] The only difference between this embodiment and Example 1 is the mass fraction of the materials used to prepare the flame-retardant protective layer solution. Specifically, the materials are: magnesium hydroxide (12% by mass), reinforcing material: nano-silica (25% by mass), film-forming agent: acrylic resin / waterborne polyurethane (weight ratio 2:1, total mass fraction 54%), and additives: 3% plasticizer, 3% defoamer, and 3% dispersant (total 8%).

[0094] Example 12

[0095] A method for preparing a composite cooling and shielding fabric:

[0096] The only difference between this embodiment and Embodiment 1 is that the coating conditions in step S3 are different. Specifically, the flame-retardant protective layer solution is coated with a coating thickness of 40 μm on one side surface of the cooling conductive layer, and then dried at high temperature (70°C) to obtain a semi-finished composite layer formed by the flame-retardant protective layer and the cooling conductive layer.

[0097] Example 13

[0098] A method for preparing a composite cooling and shielding fabric:

[0099] The only difference between this embodiment and Embodiment 1 is that the coating conditions in step S3 are different. Specifically, the flame-retardant protective layer solution is coated with a coating thickness of 220 μm on one side surface of the cooling conductive layer, and then dried at high temperature (55°C) to obtain a semi-finished composite layer formed by the flame-retardant protective layer and the cooling conductive layer.

[0100] Comparative Example 1

[0101] A method for preparing a composite cooling and shielding fabric:

[0102] The only difference between this comparative example and Example 1 is that no flame-retardant protective layer is provided.

[0103] Comparative Example 2

[0104] A method for preparing a composite cooling and shielding fabric:

[0105] The only difference between this comparative example and Example 1 is that, in preparing the conductive fabric, a double-layered covering yarn was not prepared; instead, pure cotton yarn was used in both the warp and weft directions, and the conductive fabric was obtained after weaving.

[0106] Comparative Example 3

[0107] A method for preparing a composite cooling and shielding fabric:

[0108] The only difference between this comparative example and Example 1 is that, in preparing the conductive fabric, a double-layer covering yarn was not prepared. Instead, pure cotton yarn with low elasticity was used in the warp direction, and spandex elastic yarn core was used directly in the weft direction. The conductive fabric was obtained after weaving.

[0109] Test methods

[0110] Cooling capacity (°C): Under sunny conditions with a perceived temperature of 30°C to 40°C, all samples and a 32-count, 133*72 density, plain weave pure cotton fabric were simultaneously placed outdoors in an unobstructed location. Temperature sensors were used to measure the hourly surface temperatures (T1) of the sample and T0 of the ordinary fabric over a 10-hour period, and the difference (T) was calculated as T = T0 - T1. The maximum value of T was taken as the indicator for evaluating the cooling capacity of each sample. The larger the value, the greater the decrease in surface temperature of the sample relative to the ordinary fabric, indicating a stronger cooling capacity.

[0111] Electric field shielding capability: Tested according to GB / T 6568-2008 "Shielding Clothing for Live Work".

[0112] Tear resistance: Tested according to GB / T 6568-2008 "Shielded Clothing for Live Work".

[0113] Table 1

[0114]

[0115]

[0116] As can be seen from the above description, the above embodiments of the present invention have achieved the preparation of a composite cooling and shielding fabric with excellent performance. The resulting composite cooling and shielding fabric not only has excellent cooling capacity and electric field shielding capacity, but also exhibits good tear resistance, thereby meeting the application requirements of various fields.

[0117] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those described herein.

[0118] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a composite cooling and shielding fabric, characterized in that, include: Step S1: The metal wire is wound and wrapped around the outer surface of the artificial fiber core to form a metal wire wrapped artificial fiber core. Then, natural fiber yarn is wrapped around the outer surface of the metal wire wrapped artificial fiber core to obtain a double-layer wrapped yarn. The double-layer wrapped yarn is woven to obtain a conductive fabric. Step S2: Prepare a radiation cooling layer solution, and immerse the conductive fabric in the radiation cooling layer solution for padding. After a first drying process, a cooling conductive layer is obtained. The cooling conductive layer has a first surface and a second surface disposed opposite to each other, and the cooling conductive layer includes a radiative cooling layer and a conductive fabric interposed inside the radiative cooling layer. By weight, the radiation cooling layer solution comprises 10-50 parts of polymer, 40-60 parts of organic solvent, 10-20 parts of inorganic nanoparticles, 1-10 parts of silane coupling agent, and 1-5 parts of first auxiliary agent; the first auxiliary agent is selected from one or more of the following: first dispersant, wetting agent, first defoamer, anti-cracking agent, and film-forming aid. Step S3: Prepare a flame-retardant protective layer solution and apply the flame-retardant protective layer solution to the first surface of the cooling conductive layer. After a second drying process, a flame-retardant protective layer is formed on the first surface. By weight, the flame-retardant protective layer solution comprises 20-40 parts of flame retardant, 10-20 parts of reinforcing material, 40-50 parts of film-forming agent, and 1-5 parts of second additive; the second additive is selected from one or more of plasticizer, second defoamer, and second dispersant; the polymer is selected from one or more of polyethyl methacrylate, polyacrylonitrile, and polyvinylidene fluoride-hexafluoropropylene. Step S4: The knitted base fabric is laminated onto the second surface of the cooling conductive layer to obtain the composite cooling shielding fabric.

2. The method for preparing the composite cooling and shielding fabric according to claim 1, characterized in that, The synthetic fiber core is selected from one or more of spandex, rubber filaments, and polyolefin fibers, and the specification of the synthetic fiber core is 1000D~2000D; and / or, The metal wire is selected from one or more of stainless steel wire, copper wire, and silver wire, and the diameter of the metal wire is 20μm~50μm; and / or, The natural fiber yarn is selected from one or more of cotton yarn, wool yarn and linen yarn, and the specification of the natural fiber yarn is 20 s / 2 to 40 s / 2.

3. The method for preparing the composite cooling and shielding fabric according to claim 1, characterized in that, The inorganic nanoparticles are silica nanoparticles and / or zinc oxide nanoparticles.

4. The method for preparing the composite cooling and shielding fabric according to claim 3, characterized in that, The organic solvent is N,N-dimethylformamide and / or acetone.

5. The method for preparing the composite cooling and shielding fabric according to claim 4, characterized in that, The organic solvent is a mixture of N,N-dimethylformamide and acetone, and the weight ratio of N,N-dimethylformamide to acetone is 1:(2~3).

6. The method for preparing the composite cooling and shielding fabric according to any one of claims 1 to 4, characterized in that, In step S2, The immersion temperature is 50℃~55℃, and the slurry rate is 80%~90%. The temperature of the first drying process is 55℃~60℃.

7. The method for preparing the composite cooling and shielding fabric according to any one of claims 1 to 4, characterized in that, The reinforcing material is selected from one or more of nano-titanium boride, nano-silica, and aramid fibers.

8. The method for preparing the composite cooling and shielding fabric according to claim 7, characterized in that, The flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, and cyclic phosphate flame retardants, wherein the cyclic phosphate flame retardant is selected from one or more of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, bisphenol A-bis(diphenyl phosphate), resorcinol, and trichloroethyl phosphate; and / or The film-forming agent is acrylic resin and / or waterborne polyurethane.

9. The method for preparing the composite cooling and shielding fabric according to claim 8, characterized in that, The film-forming agent is a mixture of acrylic resin and waterborne polyurethane, and the weight ratio of the acrylic resin to the waterborne polyurethane is (1.8~2.0):

1.

10. The method for preparing the composite cooling and shielding fabric according to any one of claims 1 to 4, characterized in that, In step S3, The coating thickness is 50μm~200μm; The second drying temperature is 60℃~65℃.

11. A composite cooling and shielding fabric, characterized in that, The composite cooling and shielding fabric is prepared by the method for preparing composite cooling and shielding fabric according to any one of claims 1 to 10.

12. The application of the composite cooling and shielding fabric of claim 11 as a shielding clothing fabric in the electrical and power field, characterized in that, The protective suit includes a face mask, a shirt, pants, or gloves.

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