Self-powered color-changing and variable infrared reflectivity cloth piece and preparation method and application thereof

Abstract

The invention relates to a self-powered color-changing and infrared-reflectivity-variable cloth piece as well as a preparation method and application thereof. Each cloth piece sequentially comprises a positive electrode friction layer, a conductive fabric base layer, an infrared reflection layer, an electrochromic layer, a gel electrolyte layer and a negative electrode friction layer from bottom to top, and the conductive fabric base layers of the adjacent cloth pieces are connected through a voltage stabilizing circuit. Under the response of external force, charge transfer is promoted between the adjacent cloth pieces through the pressing and / or friction effect, the cloth pieces are induced to achieve reflectivity adjustment under the infrared wave band, and the electrochromic layer is induced to change color under the visible light wave band. Compared with the prior art, the cloth piece and the fabric provided by the invention have electrochromic and electrochromic infrared emissivity properties, and can realize self-energy supply of the whole fabric system.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional materials, and in particular relates to a self-powered color-changing and infrared reflectivity-changing cloth sheet, and a preparation method and application thereof. Background Art

[0002] Electrochromic materials are a class of smart materials that can undergo reversible changes in optical properties (such as color, transmittance, and reflectivity) under the action of an external electric field. They achieve dynamic control of color or optical properties through electrochemical redox reactions or ion insertion / extraction processes. Electrotropic infrared emissivity materials are a class of materials that can controllable infrared emissivity through the action of an electric field. They have the advantages of flexible regulation, simple structure, and excellent performance. Given their excellent dynamic control characteristics for optical properties, electrochromic materials and electrotropic infrared emissivity materials can be used as a type of adaptive infrared camouflage fabric, suitable for military applications such as camouflage clothing, camouflage nets, and automotive camouflage outerwear.

[0003] CN103257500A discloses a reflective electrochromic fabric and its preparation method. The fabric comprises a conductive fabric, an ion storage layer, an electrolyte, an electrochromic polymer, and a transparent protective film. The fabric is connected to a DC power supply via a wire, and the conductive polymer achieves electrochromism. However, the electrochromic fabric only achieves electrochromism and cannot adjust its reflectivity in the infrared band.

[0004] In addition, existing electrochromic and infrared reflectivity control devices generally use external battery power supply systems. For example, in CN103257500A, a wire is required to be drawn from the flexible fabric of the working electrode and the counter electrode respectively, and connected to a DC power supply with an adjustable voltage of no more than 3V. However, in adaptive infrared camouflage fabrics, external battery power supply will cause the following problems: (1) The mass of the battery module accounts for too large a proportion of the total mass of the clothing, significantly affecting wearing comfort; (2) There are mechanical compatibility defects between the rigid battery structure and the flexible fabric substrate; (3) The electrochromic and electrochromic infrared reflectivity speeds are too slow. Therefore, how to achieve the integration of flexible fabrics and self-powered systems and eliminate the burden of external power supplies has become a technical problem that needs to be solved urgently.

[0005] Therefore, it is urgent to develop a new type of adaptive camouflage fabric that combines electrochromic and electrotropic infrared emissivity performance and can achieve self-power. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems in the prior art that it is difficult to balance the electrochromic and electrochromic infrared emissivity performances and to achieve self-power supply, and to provide a self-powered color-changing and infrared reflectivity-changing cloth sheet and its preparation method and application.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention first provides a self-powered color-changing and infrared reflectivity-changing cloth sheet, which comprises, from bottom to top, a positive electrode friction layer, a conductive fabric base layer, an infrared reflective layer, an electrochromic layer, a gel electrolyte layer, and a negative electrode friction layer. The conductive fabric base layers of adjacent cloth sheets are connected via a voltage stabilizing circuit.

[0009] In response to external force, the adjacent pieces of cloth are pressed and / or rubbed to promote charge transfer, thereby inducing the cloth to adjust its reflectivity in the infrared band and inducing the electrochromic layer to change color in the visible light band.

[0010] Furthermore, the conductive fabric cloth base layer includes at least two spliced ​​fabric layers.

[0011] Furthermore, the spliced ​​fabric layer includes a conductive fabric layer and an insulating fabric layer that are stitched alternately.

[0012] Furthermore, the conductive fabric base layer is silver nano-fabric.

[0013] Furthermore, the material of the positive electrode friction layer includes at least one of copper foil, nylon, and wool.

[0014] Furthermore, the material of the negative electrode friction layer includes at least one of polyperfluoroethylene propylene, polytetrafluoroethylene, and polyimide.

[0015] Furthermore, the material of the infrared reflective layer includes any one or more of indium tin oxide, gold, and silver, preferably indium tin oxide.

[0016] Furthermore, the electrochromic layer includes any one or more of polyaniline, polypyrrole, and polythiophene, preferably polyaniline.

[0017] Furthermore, the gel electrolyte layer includes a polymethyl methacrylate gel matrix and an electrolyte loaded in the gel matrix.

[0018] Furthermore, the electrolyte includes any one or more of lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, sodium permanganate, and aluminum phosphate.

[0019] Furthermore, the voltage stabilizing circuit adopts any one of a bridge rectifier circuit, a BUCK voltage stabilizing circuit, and a capacitor series-parallel circuit.

[0020] Furthermore, under the action of pressing, the positive friction layer and the negative friction layer between adjacent cloth pieces generate a piezoelectric effect, thereby causing charge movement.

[0021] Furthermore, under the action of friction, the positive friction layer and the negative friction layer between adjacent cloth pieces generate a triboelectric effect, thereby generating charge movement.

[0022] The present invention also provides a method for preparing a self-powered color-changing and infrared reflectivity-changing cloth sheet, the method comprising the following steps:

[0023] S1: depositing an infrared reflective layer on a conductive fabric base layer;

[0024] S2: Mixing the polymer monomer corresponding to the electrochromic layer with an acidic solution, and immersing the conductive fabric base layer obtained in S1 into the solution, and then obtaining the electrochromic layer by electrochemical deposition, which is then dried for later use;

[0025] S3: coating a gel electrolyte layer on the surface of the electrochromic layer and drying it for later use;

[0026] S4: encapsulating the positive electrode friction layer and the negative electrode friction layer on the outside of the conductive fabric base layer and the outside of the gel electrolyte layer respectively;

[0027] S5: Connect the voltage stabilizing circuit to finally obtain a self-powered color-changing and infrared reflectivity-changing cloth.

[0028] Furthermore, in step S2, the acidic substance in the acidic solution includes any one or more of sulfuric acid, hydrochloric acid, phosphoric acid, perchloric acid, dodecylbenzenesulfonic acid, and camphorsulfonic acid.

[0029] The present invention also provides an application of a self-powered color-changing and infrared reflectivity-changing cloth piece in the preparation of adaptive camouflage clothing.

[0030] Furthermore, the self-powered color-changing and infrared reflectivity-changing cloth pieces are arranged at intervals on the surface of the main body of the clothing. Charge transfer can be achieved between adjacent cloth pieces by pressing and / or friction, so as to realize current flow through self-powering effect and thereby change the color and infrared reflectivity of the clothing surface.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The present invention prepares a cloth piece with both electrochromic and electrochromic infrared emissivity properties by arranging a positive electrode friction layer, a conductive fabric base layer, an infrared reflective layer, an electrochromic layer, a gel electrolyte layer and a negative electrode friction layer layer in a layer-by-layer manner, and adjacent cloth pieces are connected by a voltage-stabilizing circuit, and the pressing and / or friction effects after the application of external force promote charge transfer and realize self-power supply in the entire intelligent textile system.

[0033] (2) The present invention integrates the flexible fabric and the pressing / friction power supply unit into an integrated assembly, forming a seamless integration of the self-powered system and the self-camouflage unit, reducing the burden of the external power supply and significantly improving the mechanical adaptability defects between the external battery structure and the flexible fabric substrate.

[0034] (3) The present invention can regulate the electron transfer within the self-powered color-changing and infrared reflectivity-changing cloth under the condition of a steady current, thereby regulating the redox reaction of the conductive polymer in the electrochromic layer to produce color change; and accelerates the movement speed of ions through the stacking of the gel electrolyte layer and the friction material layer, thereby accelerating the change speed of the electrochromic infrared emissivity and the reflection range.

[0035] (4) The present invention provides a modular, self-assembly, and self-powered intelligent camouflage fabric system that can be modified and spliced ​​according to site needs, thus having high flexibility.

[0036] (5) The addition of the positive electrode friction layer and the negative electrode friction layer in the present invention not only enables the self-power supply of the entire fabric system, but also makes it more durable in daily use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of the self-powered color-changing and infrared reflectivity-changing cloth of the present invention.

[0038] Figure 2 This is a flow chart for preparing the self-powered color-changing and infrared reflectivity-changing cloth sheet of the present invention.

[0039] Figure 3 Schematic diagram of the structure of the adaptive camouflage clothing of the present invention.

[0040] Figure 4 Schematic diagram of the color transition of the electrochromic layer of the present invention in a semi-oxidized state and a fully oxidized state.

[0041] Figure 5 Schematic diagram of the self-powered color-changing and infrared reflectivity-changing cloth sheets of the present invention when they are overlapped.

[0042] Figure 6 Schematic diagram of charge transfer during the pressing process of the cloth piece of the present invention.

[0043] Figure 7 Schematic diagram of charge transfer during the friction process of the cloth piece of the present invention.

[0044] Description of the marks in the figure:

[0045] 1-positive electrode friction layer, 2-conductive fabric base layer, 21-conductive fabric layer, 22-insulating fabric layer, 3-infrared reflection layer, 4-electrochromic layer, 5-gel electrolyte layer, 6-negative electrode friction layer, 7-voltage stabilizing circuit. DETAILED DESCRIPTION

[0046] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0047] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional reagents, methods, instruments and equipment in the art. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0048] The first aspect of the present invention provides a self-powered color-changing and infrared reflectivity-changing cloth. Figure 1 As shown, the cloth piece includes, from bottom to top, a positive friction layer 1, a conductive fabric base layer 2, an infrared reflective layer 3, an electrochromic layer 4, a gel electrolyte layer 5 and a negative friction layer 6, and adjacent cloth pieces are connected by a voltage stabilizing circuit 7; in response to an external force, the conductive fabric base layers 2 of adjacent cloth pieces promote charge transfer through pressing and / or friction, inducing the cloth piece to achieve reflectivity adjustment in the infrared band and inducing the electrochromic layer 4 to change color in the visible light band.

[0049] In some specific embodiments, the conductive fabric cloth base layer includes at least two spliced ​​fabric layers.

[0050] In some more specific embodiments, the stitched fabric layer comprises a conductive fabric layer 21 and an insulating fabric layer 22, which are interlaced and stitched together. The conductive fabric layer 21 includes, but is not limited to, silver nanofabric, nickel-plated conductive fabric, gold-plated conductive fabric, carbon-plated conductive fabric, and aluminum foil fiber composite fabric. The insulating fabric layer 22 includes, but is not limited to, polyester fiber fabric, aramid fabric, and natural fiber fabric. The conductive fabric layer 21 is preferably silver nanofabric, which exhibits outstanding conductivity in terms of low resistance, high stability, and rapid response, while also possessing high flexibility and acid and alkali resistance.

[0051] In some specific embodiments, the material of the positive electrode friction layer 1 includes but is not limited to at least one of copper foil, nylon, and wool. The positive electrode friction layer 1 must meet the requirements of waterproof, anti-friction, and anti-folding properties.

[0052] In some specific embodiments, the material of the negative electrode friction layer 6 includes but is not limited to at least one of polyperfluoroethylene propylene, polytetrafluoroethylene, and polyimide. The negative electrode friction layer 6 must meet the properties of transparency, waterproofness, friction resistance, and folding resistance.

[0053] In some specific embodiments, the material of the infrared reflective layer 3 includes, but is not limited to, any one or more of indium tin oxide, gold, and silver, preferably gold. Gold has excellent electrical conductivity, chemical stability, and infrared reflectance adjustment capability, and is therefore suitable for use as the infrared reflective layer 3 of the present invention.

[0054] In some specific embodiments, the electrochromic layer 4 includes but is not limited to any one or more of polyaniline, polypyrrole, and polythiophene, preferably polyaniline.

[0055] In some specific embodiments, when the electrochromic layer 4 is polyaniline, it exhibits a reversible color change from yellow to green to blue at a voltage of -0.8 to 1.5 V.

[0056] In some specific embodiments, the gel electrolyte layer 5 includes a polymethyl methacrylate gel matrix and an electrolyte loaded in the gel matrix.

[0057] In some more specific embodiments, the electrolyte includes but is not limited to any one or more of lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, sodium permanganate, and aluminum phosphate.

[0058] In some specific implementations, the voltage stabilizing circuit 7 is not limited to any one of a bridge rectifier circuit, a buck voltage stabilizing circuit, and a capacitor series-parallel circuit.

[0059] In some specific embodiments, under the action of pressing, the positive electrode friction layer 1 and the negative electrode friction layer 6 between adjacent cloth pieces generate a piezoelectric effect, thereby generating charge movement.

[0060] In some specific embodiments, under the action of friction, the positive electrode friction layer 1 and the negative electrode friction layer 6 between adjacent cloth pieces generate a triboelectric effect, thereby generating charge movement.

[0061] Based on the same inventive concept, the second aspect of the present invention provides a method for preparing a self-powered color-changing and infrared reflectivity-changing cloth sheet, the preparation method comprising the following steps:

[0062] S1: depositing an infrared reflective layer 3 on a conductive fabric base layer 2;

[0063] S2: Mixing the polymer monomer corresponding to the electrochromic layer 4 with an acidic solution, and immersing the conductive fabric base layer obtained in S1 into the solution, and then obtaining the electrochromic layer by electrochemical deposition, which is then dried for later use;

[0064] S3: Coating a gel electrolyte layer 5 on the surface of the electrochromic layer 4 and drying it for later use;

[0065] S4: Encapsulating the positive electrode friction layer 1 and the negative electrode friction layer 6 on the outside of the conductive fabric base layer and the outside of the gel electrolyte layer respectively;

[0066] S5: Connect the voltage stabilizing circuit 7 to finally obtain a self-powered color-changing and infrared reflectivity-changing cloth.

[0067] In some specific embodiments, in step S2, the acidic substance in the acidic solution includes any one or more of sulfuric acid, hydrochloric acid, phosphoric acid, perchloric acid, dodecylbenzenesulfonic acid, and camphorsulfonic acid. Acid doping modification can transform the electrotropic infrared emissivity material from an insulator to a conductor, significantly increasing the free electron density of the conductive polymer.

[0068] Based on the same inventive concept, the third aspect of the present invention provides an application of a self-powered color-changing and infrared reflectivity-changing cloth in the preparation of adaptive camouflage clothing, such as military camouflage clothing, military camouflage nets, military vehicle camouflage outerwear, etc., which require dynamic control of color and infrared emissivity.

[0069] In some specific embodiments, the self-powered color-changing and infrared reflectivity-changing cloth pieces are arranged at equal intervals on the surface of the main body of the clothing, and charge transfer can be achieved between adjacent cloth pieces by pressing and / or friction, so as to achieve current flow through self-powering effect and thus change the color and infrared reflectivity of the clothing surface.

[0070] The above embodiments can be implemented individually or in any combination of two or more. The above embodiments will be described in more detail below with reference to specific examples.

[0071] Example:

[0072] This embodiment provides a self-powered color-changing and infrared reflectivity-changing cloth piece and adaptive camouflage clothing, and its preparation method is as follows: Figure 2 The specific process is as follows:

[0073] (1) Silver nanofabric is selected as the conductive fabric layer and polyester fiber fabric is selected as the insulating fabric layer. The two can be stitched together in a checkerboard pattern to form a spliced ​​fabric layer, and the two spliced ​​fabric layers are overlapped and pressed to form a conductive fabric base layer.

[0074] (2) Magnetron sputtering of gold onto the surface of the conductive fabric substrate to form an infrared reflective layer, yielding a silver nanofabric / gold material. The magnetron sputtering parameters were as follows: argon flow rate of 40 sccm; sputtering power of 50 W.

[0075] (3) Prepare a 1 mol / L sulfuric acid solution, slowly add aniline and sulfuric acid in a molar ratio of 1:2 to the sulfuric acid solution under deoxygenated conditions, and stir when a white precipitate appears until the precipitate dissolves.

[0076] (4) The silver nanofabric / gold was placed in a solution and electrochemically deposited in an electrochemical workstation. A three-electrode method was used, with an Ag / AgCl electrode as the reference electrode and the silver nanofabric / ITO as the working electrode, to obtain a silver nanofabric / gold / electrochromic layer. The polymerization voltage was 0.7 V, and the electrochemical reaction lasted approximately 3-15 minutes. After preparation, the silver nanofabric / gold / electrochromic layer was rinsed with ultrapure water until the excess polyaniline powder on the surface was completely removed, and then placed in a vacuum drying oven at 40°C for drying.

[0077] (5) Prepare the gel electrolyte by dissolving 4 g of lithium perchlorate (LiClO4) in a mixed solution of 20 mL of propylene carbonate and 80 mL of acetonitrile. Then, weigh 8 g of polymethyl methacrylate (PMMA) and add it to the mixed solution and stir evenly to obtain a transparent LiClO4 / PC gel electrolyte system for use.

[0078] (6) The composite electrolyte was sonicated and vacuumed to remove bubbles, and then applied to the silver nanofabric / gold / electrochromic layer and left to dry for 1 h.

[0079] (7) PTFE is used as the negative electrode friction layer to cover the electrolyte for packaging, and nylon is used as the positive electrode friction layer to cover the silver nano-cloth for packaging, and finally a color-changing and infrared reflectivity-changing cloth is produced.

[0080] (8) Connect the voltage stabilizing circuit: Figure 3 As shown, the prepared cloth pieces are sewn at equal intervals on the main body of the adaptive camouflage clothing, and the conductive cloth layers of adjacent cloth pieces are connected by wires and a bridge rectifier circuit is used to improve voltage stability.

[0081] Figure 4 The following are photos of the actual color change of the polyaniline electrochromic layer in the fabric of this example. At a voltage of 0.2V, the polyaniline electrochromic layer is yellow (fully reduced state). When the voltage is adjusted to 0.4V, the polyaniline electrochromic layer turns green (semi-oxidized state), with a response time of 1-5 seconds. At a voltage of 0.8V, the polyaniline electrochromic layer turns blue (fully oxidized state), with a response time of 1-5 seconds.

[0082] In addition, polyaniline doped with acidic substances can simultaneously respond to charge transfer and undergo changes in reflectivity. For fully reduced polyaniline, its reflectivity for infrared rays is the highest; for fully oxidized polyaniline, its reflectivity for infrared rays is the lowest. Based on this, by pressing or rubbing between the positive friction layer and the negative friction layer of adjacent cloth pieces, the reflectivity of adaptive camouflage clothing to specific bands can be reduced, thereby achieving invisibility in specific bands. The self-powered color-changing and infrared reflectivity-changing cloth pieces prepared in this embodiment can achieve significant emissivity differences (Δε) of 0.35 and 0.27 in the 8-14μm and 2.5-25μm bands, respectively, which can meet the dynamic camouflage requirements in actual combat environments.

[0083] Figure 5 A schematic diagram of overlapping layers of self-powered color-changing and infrared reflectivity-changing fabric. Because the alternating current generated by the friction of the devices is generated, the direction of charge movement can be controlled by integrating a rectifier and voltage-stabilizing circuit. When polyaniline oxidation is desired, charge movement during the reduction reaction can be restricted; when polyaniline reduction is desired, charge movement during the oxidation reaction can be restricted.

[0084] Figure 6 This diagram illustrates the charge transfer between adjacent fabric pieces produced in this embodiment during the pressing process. During the pressing process, due to the principle of electrostatic induction, the lower fabric piece generates charge that moves toward the upper fabric piece, causing the upper fabric piece's electrode to become negatively charged and the lower fabric piece's electrode to become positively charged. Simultaneously, the lower fabric piece loses charge, causing the polyaniline in the lower fabric piece to oxidize. After the pressing process is complete, there is no electrostatic induction between the fabric pieces, and no charge transfer occurs. When the two fabric pieces are released, due to the principle of electrostatic induction, the upper fabric piece generates charge that moves toward the lower fabric piece, causing the polyaniline in the lower fabric piece to undergo a reduction reaction.

[0085] Figure 7 This figure illustrates the charge transfer between adjacent fabric sheets produced in this embodiment during friction. During friction, due to electrostatic induction, the lower fabric sheet generates charge that moves toward the upper fabric sheet, causing the upper fabric sheet's electrode to become negatively charged and the lower fabric sheet's electrode to become positively charged. Simultaneously, the lower fabric sheet loses charge, causing the polyaniline in the lower fabric sheet to oxidize. After friction is complete, there is no electrostatic induction between the fabric sheets, and no charge transfer occurs. When the two fabric sheets are separated, due to electrostatic induction, the upper fabric sheet generates charge that moves toward the lower fabric sheet, causing the polyaniline in the lower fabric sheet to undergo a reduction reaction.

[0086] In summary, the present invention produces a cloth piece with both electrochromic and electrochromic infrared emissivity properties by arranging a positive electrode friction layer, a conductive fabric base layer, an infrared reflective layer, an electrochromic layer, a gel electrolyte layer and a negative electrode friction layer layer in a layer-by-layer manner. Adjacent cloth pieces are connected by a voltage-stabilizing circuit, and the pressing and / or friction after the application of external force promotes charge transfer and realizes self-power supply in the entire intelligent textile system.

[0087] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A self-powered color-changing and infrared reflectivity-changing cloth, characterized in that: The cloth piece includes, from bottom to top, a positive electrode friction layer, a conductive fabric base layer, an infrared reflective layer, an electrochromic layer, a gel electrolyte layer, and a negative electrode friction layer. The conductive fabric base layers of adjacent cloth pieces are connected via a voltage stabilizing circuit. In response to external force, the adjacent pieces of cloth are pressed and / or rubbed to promote charge transfer, thereby inducing the cloth to adjust its reflectivity in the infrared band and inducing the electrochromic layer to change color in the visible light band.

2. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: The conductive fabric cloth base layer comprises at least two spliced ​​fabric layers; The spliced ​​fabric layer comprises a conductive fabric layer and an insulating fabric layer that are stitched alternately.

3. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: The material of the positive electrode friction layer includes at least one of copper foil, nylon, and wool; The material of the negative electrode friction layer includes at least one of polyperfluoroethylene propylene, polytetrafluoroethylene, and polyimide.

4. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: The material of the infrared reflective layer includes any one or more of indium tin oxide, gold, and silver; The electrochromic layer includes any one or more of polyaniline, polypyrrole, and polythiophene.

5. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: The gel electrolyte layer includes a polymethyl methacrylate gel matrix and an electrolyte loaded in the gel matrix; the electrolyte includes any one or more of lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, sodium permanganate, and aluminum phosphate.

6. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: The voltage stabilizing circuit adopts any one of a bridge rectifier circuit, a BUCK voltage stabilizing circuit, and a capacitor series-parallel circuit.

7. The self-powered color-changing and infrared reflectivity-changing cloth according to claim 1, characterized in that: Under the action of pressing, the positive friction layer and the negative friction layer between the adjacent cloth pieces generate a piezoelectric effect, thereby generating charge movement; Under the action of friction, the positive friction layer and the negative friction layer between adjacent cloth pieces produce a triboelectric effect, thereby generating charge movement.

8. A method for preparing the self-powered color-changing and infrared reflectivity-changing cloth sheet according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1: depositing an infrared reflective layer on a conductive fabric base layer; S2: Mixing the polymer monomer corresponding to the electrochromic layer with an acidic solution, and immersing the conductive fabric base layer obtained in S1 into the solution, and then obtaining the electrochromic layer by electrochemical deposition, which is then dried for later use; S3: coating a gel electrolyte layer on the surface of the electrochromic layer and drying it for later use; S4: encapsulating the positive electrode friction layer and the negative electrode friction layer on the outside of the conductive fabric base layer and the outside of the gel electrolyte layer respectively; S5: Connect the voltage stabilizing circuit to finally obtain a self-powered color-changing and infrared reflectivity-changing cloth.

9. The method for preparing the self-powered color-changing and infrared reflectivity-changing cloth according to claim 8, characterized in that: In step S2, the acidic substance in the acidic solution includes any one or more of sulfuric acid, hydrochloric acid, phosphoric acid, perchloric acid, dodecylbenzenesulfonic acid, and camphorsulfonic acid.

10. Use of the self-powered color-changing and infrared reflectivity-changing fabric according to any one of claims 1 to 8 in preparing adaptive camouflage clothing, characterized in that: The self-powered color-changing and infrared reflectivity-changing cloth pieces are arranged at intervals on the surface of the clothing body in sequence. Charge transfer can be achieved between adjacent cloth pieces by pressing and / or friction, so as to realize current flow through self-powering effect and thereby change the color and infrared reflectivity of the clothing surface.

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