Multi-layer self-powered fabric based on electromagnetic induction and method for manufacturing the same

Abstract

The application discloses a kind of multi-layer self-powered fabric based on electromagnetic induction and preparation method thereof, first, the elastic polymer after pretreatment is mixed with magnetic particle at a certain ratio, then pour into mould, obtain magnetic layer after setting, magnetization;Electrically conductive fiber is sewn in the form of ring on the surface of fiber fabric, and obtain fiber ring fabric;Then, the magnetic layer and fiber ring fabric are sewn according to the layered order of fiber ring fabric-magnetic layer-fiber ring fabric, and obtain the multi-layer self-powered fabric based on electromagnetic induction. The compression deformation of the magnetic layer changes the magnetic intensity, which in turn changes the magnetic flux of the upper and lower layers of the electrically conductive fiber ring, generating an induced electromotive force, thereby realizing the combination of electromagnetic induction and flexible sensor device. Meanwhile, the magnetization treatment ensures that the multi-layer self-powered fabric based on electromagnetic induction can generate sufficient electrical signal changes when deformed, which can be used for monitoring human or external signals such as impact, pressure and pulse.

Description

Technical Field

[0001] This invention relates to the field of flexible sensing fabric technology, and in particular to a multilayer self-powered fabric based on electromagnetic induction and its preparation method. Background Technology

[0002] Currently, flexible sensing technology is developing rapidly and is gradually being applied in fields such as personal health monitoring, human-computer interaction, and soft robotics. However, this technology requires external power supply / storage devices (such as batteries), which limits its application range, lifespan, and lightweight design. Therefore, self-powering of flexible sensing devices is crucial.

[0003] Electromagnetic induction is the phenomenon where a change in magnetic flux through a closed loop induces an electromotive force. First discovered by Faraday, this phenomenon led to the emergence of self-generating devices based on electromagnetic induction, which gradually became an important energy harvesting method. However, in current self-generating devices, the conductive coils and magnets are primarily made of rigid materials, are heavy, and lack flexibility and elasticity, making it difficult to integrate them with flexible sensors for related applications.

[0004] In the prior art, invention patent CN110184731B discloses a fabric sensor with negative piezoresistive effect and its application. It uses an elastic knitted fabric as the substrate, immerses it in a dispersion of graphene-containing conductive material, increases the immersion rate through stirring and pressing, removes and dries, and repeats the above operation once or multiple times; then it is reduced with hydrazine hydrate, cleaned and dried to obtain a coated fabric sensor; at least two electrodes are set on the fabric, connected to an external current source and voltage measuring instrument through conductive silver paste, aluminum foil, copper wires, etc., and the strain sensing with negative piezoresistive effect is achieved by characterizing the piezoresistive effect of strains such as tension, compression, torsion, and oscillation. This fabric sensor has a simple process, is easy to operate, has low production cost, and stable function. However, the device requires an external current source during application, which limits its sensing use.

[0005] In view of this, it is necessary to design a multilayer self-powered fabric based on electromagnetic induction and its preparation method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-layer self-powered fabric based on electromagnetic induction and its preparation method. Magnetic fibers are prepared using elastic polymers and magnetic particles, and then the magnetic fibers are magnetized. Conductive fibers are then sewn in loops onto the surface of the fiber fabric to obtain a fiber loop fabric. Finally, the fabric is sewn in a layered sequence of fiber loop fabric-magnetic layer-fiber loop fabric to obtain a self-powered multi-layer self-powered fabric based on electromagnetic induction for monitoring human or external signals such as impact, pressure, and pulse.

[0007] To achieve the above-mentioned objective, this invention provides a method for preparing a multilayer self-powered fabric based on electromagnetic induction, comprising the following steps:

[0008] S1. After mixing the pretreated elastic polymer with magnetic particles in a certain proportion, pour the mixture into a mold, and obtain a magnetic layer by shaping and magnetizing.

[0009] S2. The conductive fibers are sewn in a loop onto the surface of the fiber fabric to obtain the fiber loop fabric.

[0010] S3. The magnetic layer prepared in step S1 and the fiber loop fabric prepared in step S2 are sewn together in a layered sequence of fiber loop fabric-magnetic layer-fiber loop fabric to obtain a multi-layer self-powered fabric based on electromagnetic induction.

[0011] As a further improvement of the present invention, in step S1, the magnetization operation is to magnetize the shaped layer to be magnetized at a voltage of 1500-3000V for 1-2000ms to obtain the magnetic layer.

[0012] As a further improvement of the present invention, in step S1, the mass ratio of the elastic polymer to the magnetic particles is 80:20 to 20:80.

[0013] As a further improvement of the present invention, the elastic polymer includes any one of polyvinyl alcohol, polyurethane, polydimethylsiloxane, polymethylvinylsiloxane, polypropylene, polyolefin and styrene polymer.

[0014] As a further improvement of the present invention, the magnetic particles include any one of neodymium iron boron magnetic powder, neodymium nickel cobalt magnetic powder, iron oxide magnetic powder, chromium dioxide magnetic powder, and cobalt-iron oxide magnetic powder.

[0015] As a further improvement of the present invention, in step S2, the conductive fiber includes any one of carbon fiber, graphene fiber, carbon nanotube fiber, silver-plated fiber, copper-plated fiber, gold-plated fiber, aluminum-plated fiber, iron-plated fiber, copper fiber, silver fiber, gold fiber, aluminum fiber, and iron fiber.

[0016] As a further improvement of the present invention, in step S1, the pretreatment operation of the elastic polymer is to dissolve the elastic polymer granules in a corresponding solvent according to the properties of the elastic polymer.

[0017] As a further improvement of the present invention, the mold is square.

[0018] As a further improvement of the present invention, in step S2, the sewing shape of the conductive fiber includes any one of triangle, quadrilateral, and circle.

[0019] The present invention also provides a multilayer self-powered fabric based on electromagnetic induction, wherein the multilayer self-powered fabric based on electromagnetic induction is prepared by any of the above technical solutions, including a loop-shaped fiber loop fabric sewn on the surface and a magnetic layer prepared by mixing elastic polymer and magnetic particles.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention uses elastic polymers and magnetic particles to prepare a magnetic layer, magnetizes the magnetic layer, and then sewn conductive fibers in a loop onto the surface of a fiber fabric to obtain a fiber loop fabric. Finally, the fiber loop fabric-magnetic layer-fiber loop fabric are sewn together in a layered sequence to obtain a multi-layer self-powered fabric based on electromagnetic induction. The compression deformation of the magnetic layer of the multi-layer self-powered fabric based on electromagnetic induction causes a change in magnetic intensity, which in turn causes a change in the magnetic flux of the upper and lower conductive fiber loops of the magnetic layer, generating an induced electromotive force. This realizes the combination of electromagnetic induction and flexible sensor devices, resulting in a self-powered multi-layer self-powered fabric based on electromagnetic induction.

[0022] 2. This invention fully enhances the magnetism of magnetic fibers through magnetization treatment, thereby ensuring that the multi-layer self-powered fabric based on electromagnetic induction can generate sufficient electrical signal changes when deformation occurs. At the same time, the layered design of fiber loop fabric-magnetic layer-fiber loop fabric makes the conductive fibers of the upper and lower fiber loop fabrics independent of each other, so that different electrical signal changes can be generated according to the compression deformation of the upper or lower layer, which can be used for monitoring human or external signals such as impact, stepping, and pulse.

[0023] 3. The multi-layer self-powered fabric based on electromagnetic induction of the present invention forms an integral fabric structure. The magnetic layer is covered by two pieces of fabric. During long-term use, it can protect the magnetic layer from wear, slow down the loss of the magnetic layer, protect the elasticity of the magnetic layer, and enable it to generate sufficient electrical signals with deformation for sensing and monitoring.

[0024] 4. The multi-layer self-powered fabric based on electromagnetic induction of the present invention utilizes the flexibility of fibers, which can be bent and rebound at will. It can be used to make clothing or carpets, etc., and does not require the use of external power supply equipment such as batteries. It can generate electrical signals by touch, and has a wide range of application prospects. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the multilayer self-powered fabric based on electromagnetic induction in Example 1.

[0026] Figure 2 This is a side view of the multilayer self-powered fabric based on electromagnetic induction in Example 1.

[0027] Figure 3The voltage change detection results are from Example 1.

[0028] Figure 4 The voltage change detection results are for Comparative Example 1.

[0029] Figure 5 The voltage change detection results are for Example 1 and Comparative Example 2.

[0030] Figure 6 This is a schematic diagram of the structure of a multilayer self-powered fabric based on electromagnetic induction, as shown in Comparative Example 2. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0033] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] This invention provides a method for preparing a multilayer self-powered fabric based on electromagnetic induction, comprising the following steps:

[0035] S1. After mixing the pretreated elastic polymer with magnetic particles in a certain proportion, pour the mixture into a square mold, and obtain a magnetic layer by shaping and magnetizing.

[0036] S2. The conductive fibers are sewn in a loop onto the surface of the fiber fabric to obtain the fiber loop fabric.

[0037] S3. The magnetic layer prepared in step S1 and the fiber loop fabric prepared in step S2 are sewn together in a layered sequence of fiber loop fabric-magnetic layer-fiber loop fabric to obtain a multi-layer self-powered fabric based on electromagnetic induction.

[0038] Specifically, in step S1, the magnetization operation involves magnetizing the shaped layer to be magnetized at a voltage of 1500-3000V for 1-2000ms to obtain a magnetic layer.

[0039] Specifically, in step S1, the mass ratio of the elastic polymer to the magnetic particles is 80:20 to 20:80; the elastic polymer includes any one of polyvinyl alcohol, polyurethane, polydimethylsiloxane, polymethylvinylsiloxane, polypropylene, polyolefin, and styrene polymer; the magnetic particles include any one of neodymium iron boron magnetic powder, neodymium nickel cobalt magnetic powder, iron oxide magnetic powder, chromium dioxide magnetic powder, and cobalt-iron oxide magnetic powder.

[0040] Specifically, in step S1, the pretreatment operation of the elastic polymer involves dissolving the elastic polymer granules in a corresponding solvent according to the properties of the elastic polymer.

[0041] Specifically, in step S2, the conductive fiber includes any one of carbon fiber, graphene fiber, carbon nanotube fiber, silver-plated fiber, copper-plated fiber, gold-plated fiber, aluminum-plated fiber, iron-plated fiber, copper fiber, silver fiber, gold fiber, aluminum fiber, and iron fiber.

[0042] Specifically, in step S2, the sewing shape of the conductive fibers includes any one of triangle, quadrilateral, or circle.

[0043] This invention also provides a multilayer self-powered fabric based on electromagnetic induction. The multilayer self-powered fabric is prepared according to a method for preparing multilayer self-powered fabrics based on electromagnetic induction, comprising a circular fiber loop fabric sewn onto its surface and a magnetic layer prepared from a mixture of elastic polymer and magnetic particles. By tapping, the magnetic layer undergoes compression deformation, changing its magnetic intensity, which in turn changes the magnetic flux of the upper and lower conductive fiber loops of the magnetic layer, generating an induced electromotive force.

[0044] The preparation method of the multilayer self-powered fabric based on electromagnetic induction provided by the present invention will be described below with reference to specific embodiments.

[0045] Example 1

[0046] This embodiment provides a method for preparing a multilayer self-powered fabric based on electromagnetic induction, including the following steps:

[0047] S1. According to the instructions, the purchased polydimethylsiloxane silicone elastomer is mixed with solutions A and B in a mass ratio of 10:1 to obtain uncured polydimethylsiloxane silicone elastomer; neodymium iron boron magnetic powder is added at the same time, poured into a square mold, and dried at 80°C for 2 hours for curing and shaping. The cured and shaped layer to be magnetized is then magnetized at 2000V for 20ms to obtain a magnetic layer; wherein, the mass ratio of polydimethylsiloxane to neodymium iron boron magnetic powder is 20:80.

[0048] S2. Copper fibers are sewn in a loop onto the surface of the fiber fabric to obtain a fiber loop fabric.

[0049] S3. Sewing together the magnetic layer prepared in step S1 and the fiber loop fabric prepared in step S2 in a layered sequence of fiber loop fabric-magnetic layer-fiber loop fabric, to obtain the following... Figure 1 and Figure 2 The image shows a multi-layered self-powered fabric based on electromagnetic induction.

[0050] Examples 2-3

[0051] Examples 2 and 3 respectively provide a method for preparing a multilayer self-powered fabric based on electromagnetic induction. Compared with Example 1, the mass ratio of polydimethylsiloxane to NdFeB magnetic powder in Example 2 is 50:50, and the mass ratio of polydimethylsiloxane to NdFeB magnetic powder in Example 3 is 80:20. The remaining steps are the same as in Example 1 and will not be repeated here.

[0052] Comparative Example 1

[0053] Comparative Example 1 provides a method for preparing a multilayer self-powered fabric based on electromagnetic induction. Compared with Example 1, step S1 of Comparative Example 1 does not involve magnetization, while the remaining steps are the same as in Example 1 and will not be repeated here.

[0054] Comparative Example 2

[0055] Comparative Example 2 provides a method for preparing a multilayer self-powered fabric based on electromagnetic induction. Purchasing polydimethylsiloxane silicone elastomer was mixed with solutions A and B in a mass ratio of 10:1 according to the instructions to obtain uncured polydimethylsiloxane silicone elastomer. Simultaneously, neodymium iron boron magnetic powder was added and poured into a square mold to approximately 1 / 8 of its capacity. Copper fibers were then placed into the mold, and polydimethylsiloxane with added neodymium iron boron magnetic powder was added until the mold reached 7 / 8 of its capacity, causing the copper fibers to form a spring-like shape in the vertical direction. The remaining 1 / 8 was filled with polydimethylsiloxane with added neodymium iron boron magnetic powder. The mixture was dried at 80°C for 2 hours for curing and shaping. After curing and shaping, it was magnetized at 2000V for 20ms to obtain a multilayer self-powered fabric based on electromagnetic induction. Figure 6 As shown; wherein the mass ratio of polydimethylsiloxane to neodymium iron boron magnetic powder is 20:80.

[0056] The voltage changes of the multilayer self-energized fabrics based on electromagnetic induction prepared in Example 1 and Comparative Examples 1-2 were detected as a result of deformation. Figures 3-5 As shown.

[0057] like Figure 3 and Figure 4As shown, after magnetizing the magnetic layer, under the same continuous striking force, the voltage signal generated by the multilayer self-energized fabric based on electromagnetic induction during striking increases from approximately ±2μV to approximately ±100μV, and the voltage change with deformation is significantly enhanced. Meanwhile, in comparison under the same striking force of 5N, the voltages in Example 1 and Comparative Example 2 are ±65μV and ±20μV, respectively. Figure 5 This is because filling the middle part of the fabric with copper fiber restricts its compression deformation and reduces the sensing sensitivity. At the same time, in Example 1, since the magnetic layer is covered by two pieces of fabric, the elasticity of the magnetic layer is protected to the greatest extent. Under the same applied force, the magnetic force of the magnetic layer changes more, so the induced electromotive force is larger.

[0058] In summary, the multilayer self-powered fabric based on electromagnetic induction and its preparation method disclosed in this invention involves preparing a magnetic layer using elastic polymers and magnetic particles, magnetizing the magnetic layer, then sewing conductive fibers in loops onto the surface of a fiber fabric to obtain a fiber loop fabric. Finally, the multilayer self-powered fabric based on electromagnetic induction is obtained by sewing the fiber loop fabric-magnetic layer-fiber loop fabric in a layered sequence. The compression deformation of the magnetic layer of the multilayer self-powered fabric based on electromagnetic induction causes a change in magnetic intensity, which in turn causes a change in the magnetic flux of the upper and lower conductive fiber loops, generating an induced electromotive force. This achieves the combination of electromagnetic induction and a flexible sensor device, resulting in a self-powered multilayer self-powered fabric based on electromagnetic induction. During the preparation process, the magnetization treatment fully enhances the magnetism of the magnetic fibers, ensuring that the multilayer self-powered fabric based on electromagnetic induction can generate sufficient electrical signal changes when deformed, for monitoring human or external signals such as impact, pressure, and pulse. The multi-layer self-powered fabric based on electromagnetic induction of the present invention utilizes the flexibility of fibers, which can be bent and rebound at will. It can be used to make clothing or carpets, etc., and does not require the use of external power supply equipment such as batteries. It can generate electrical signals by touch, and has a wide range of application prospects.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a multilayer self-powered fabric based on electromagnetic induction, characterized in that, Includes the following steps: S1. After mixing the pretreated elastic polymer with magnetic particles in a certain proportion, pour the mixture into a mold, and then shape and magnetize it to obtain a magnetic layer. The magnetization operation is to magnetize the shaped layer to be magnetized at a voltage of 1500-3000V for 1~2000ms to obtain the magnetic layer. S2. The conductive fibers are sewn in a loop onto the surface of the fiber fabric to obtain the fiber loop fabric. S3. The magnetic layer prepared in step S1 and the fiber loop fabric prepared in step S2 are sewn together in a layered sequence of fiber loop fabric-magnetic layer-fiber loop fabric to obtain a multi-layer self-powered fabric based on electromagnetic induction; the compression deformation of the magnetic layer causes a change in magnetic intensity, which in turn causes a change in the magnetic flux of the conductive fiber loops in the upper and lower layers of the magnetic layer, generating an induced electromotive force.

2. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 1, characterized in that: In step S1, the mass ratio of the elastic polymer to the magnetic particles is 80:20 to 20:

80.

3. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 2, characterized in that: The elastic polymer includes any one of polyvinyl alcohol, polyurethane, polydimethylsiloxane, polymethylvinylsiloxane, polyolefin and styrene polymer.

4. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 2, characterized in that: The magnetic particles include any one of neodymium iron boron magnetic powder, neodymium nickel cobalt magnetic powder, iron oxide magnetic powder, chromium dioxide magnetic powder, and cobalt-iron oxide magnetic powder.

5. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 1, characterized in that: In step S2, the conductive fiber includes any one of carbon fiber, graphene fiber, carbon nanotube fiber, silver-plated fiber, copper-plated fiber, gold-plated fiber, aluminum-plated fiber, iron-plated fiber, copper fiber, silver fiber, gold fiber, aluminum fiber, and iron fiber.

6. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 1, characterized in that: In step S1, the pretreatment operation of the elastic polymer involves dissolving the granules of the elastic polymer in a corresponding solvent according to the properties of the elastic polymer.

7. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 1, characterized in that: The mold is square.

8. The method for preparing a multilayer self-powered fabric based on electromagnetic induction according to claim 1, characterized in that: In step S2, the sewing shape of the conductive fiber includes any one of triangle, quadrilateral, and circle.

9. A multilayer self-powered fabric based on electromagnetic induction, characterized in that, The multilayer self-powered fabric based on electromagnetic induction is prepared by the preparation method described in any one of claims 1-8, including a looped fiber fabric sewn onto the surface and a magnetic layer prepared by mixing an elastic polymer and magnetic particles.

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