Self-powered friction structure and preparation method thereof and insole
By using a one-piece molded self-powered friction structure, the problem of relying on traditional batteries for power supply in light-up shoes is solved, achieving efficient power conversion and stable power supply, which is suitable for wearable devices, especially insoles.
Patent Information
- Application Number
- CN202410394427.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2044-04-02
AI Technical Summary
Existing luminous shoes rely on traditional batteries for power, which have short lifespans, are easily damaged, have complex structures, poor stability, and are difficult to integrate into designs and be mass-produced.
It adopts a one-piece molded self-powered friction structure, including a negative electrode structure, a positive electrode structure and an elastic column. Through material selection and process design, it achieves efficient power conversion and stable power supply, and is suitable for wearable devices.
It achieves self-powered operation, has a robust and durable structure, is suitable for large-scale production, provides stable power support, and enhances ease of use and flexibility.
Smart Images
Figure CN118252300B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of textile technology, specifically to a self-powered friction structure, its preparation method, and an insole. Background Technology
[0002] With the continuous improvement of living standards in modern society, people's expectations for clothing have gone beyond its basic functions of warmth and modesty; they now seek fashion and technological sophistication. Against this backdrop, luminous shoes, as a product combining fashion and technology, have gained popularity among consumers. However, most luminous shoes on the market currently rely on traditional battery power sources, such as button batteries and rechargeable batteries, which have significant limitations. First, these batteries have relatively short lifespans and require frequent replacement, causing inconvenience to users. Second, the charging and replacement process can also damage or degrade the shoes, further impacting the user experience. Therefore, developing a novel energy supply technology to solve the power supply problem for luminous shoes has become an important research direction. Triboelectric nanogenerators (TENGs), as a novel energy technology, offer new possibilities for solving this problem due to their unique energy conversion mechanism. They can convert the mechanical energy generated by human movement into electrical energy, providing a continuous and stable power source for low-power devices such as luminous shoes. In daily life, whether walking or running, people generate a large amount of mechanical energy, which can be utilized by triboelectric nanogenerators. However, current triboelectric nanogenerators still face several technical challenges. First, while their basic working principle is clear—that walking causes the cover plate to compress the support structure and springs, which in turn compresses the triboelectric generator to produce an electric current—the overall structure is complex, making integrated design and large-scale fabrication difficult. Second, the numerous mechanical components inside the shoe contribute to its poor stability, making it susceptible to external environmental and usage conditions, leading to decreased fatigue resistance and a shortened lifespan. Therefore, to fully realize the application potential of triboelectric nanogenerators in wearable devices such as luminescent shoes, further improvements and optimizations to their structural design are needed to enhance stability and durability, reduce production costs, and achieve large-scale production and widespread application. Summary of the Invention
[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the background art and provide a self-powered friction structure, its preparation method and insole. This self-powered friction structure is not only simple to prepare, but also achieves integrated molding, has the characteristics of high durability and stable voltage output, and is easy to cut into any shape to meet the needs of large-scale production.
[0004] To achieve the above objectives, the various embodiments of the present invention employ the following technical solutions, but are not limited to the following solutions:
[0005] The first technical solution relates to a self-powered friction structure, comprising: a negative electrode structure, which includes a first negative electrode material layer, a conductive fabric layer, and a second negative electrode material layer connected in sequence, the conductive fabric layer being located between the first negative electrode material layer and the second negative electrode material layer; a positive electrode structure, which includes a positive electrode material layer and a base layer connected to each other; and several elastic pillars, the elastic pillars being evenly distributed and connecting the second negative electrode material layer and the positive electrode material layer to form a hollow structure, thereby isolating the second negative electrode material layer and the positive electrode material layer; the first negative electrode material layer and the second negative electrode material layer are made of different polarity materials than the positive electrode material layer; the first negative electrode material layer is adapted to be pressed so that the second negative electrode material layer overcomes the elastic force of the elastic pillars and contacts the positive electrode material layer along a first direction to generate charge through friction; when the pressing pressure is less than the elastic force of the elastic pillars, the elastic pillars elastically recover, the first negative electrode material layer moves relative to the positive electrode material layer along the extension direction of the first direction and separates, generating a voltage, which is conducted through the conductive fabric layer to form a current; the negative electrode structure, the elastic pillars, and the positive electrode structure are integrally formed.
[0006] The second technical solution is based on the first technical solution, wherein the first negative electrode material layer and the second negative electrode material layer are both made of the same electronegative polymer material, and the positive electrode material layer is made of an electropositive, surface-insulating conductive yarn or polymer material.
[0007] The third technical solution is based on the second technical solution, wherein the first negative electrode material layer and the second negative electrode material layer are made of one of the following materials: polydimethylsiloxane, barium titanate-doped polydimethylsiloxane, polytetrafluoroethylene, polyvinyl chloride, or fluororubber.
[0008] The fourth technical solution is based on the first technical solution, wherein the conductive fabric layer is a conductive fabric or a conductive polymer.
[0009] The fifth technical solution is based on the fourth technical solution, wherein the conductive fabric is one of knitted silver cloth, woven silver cloth or copper-nickel alloy cloth, and its thickness is 0.08mm.
[0010] The sixth technical solution is based on the first technical solution, wherein the elastic column is a rubber tube made of rubber material.
[0011] The seventh technical solution is based on the first technical solution, wherein the base layer is a hydrophobic layer made of hydrophobic polymer material, and the thickness of the base layer is 0.5 mm.
[0012] The eighth technical solution is based on the first technical solution, wherein the shape of the self-powered friction structure is one or a combination of U-shaped, O-shaped, and C-shaped.
[0013] The ninth technical solution is based on any one of the first to eighth technical solutions, wherein an insole, including an insole body, is partially or entirely made using the aforementioned self-powered friction structure.
[0014] The tenth technical solution is based on any one of the first to eighth technical solutions, wherein a method for preparing a self-powered friction structure, used to fabricate the aforementioned self-powered friction structure, includes the following steps: S1, preparation of the negative electrode structure: the prepared negative electrode polymer dispersion is subjected to vacuum degassing treatment, then uniformly coated onto a first mold, and a semi-crosslinked layer of the negative electrode polymer is formed by heating; this semi-crosslinked layer is laid flat on one side of a conductive fabric layer and placed in an oven for heating and crosslinking curing; the same steps are used to complete the crosslinking curing of the negative electrode polymer on the other side of the conductive fabric layer to form a complete negative electrode structure; S2, preparation of the positive electrode structure: the prepared hydrophobic... The water-based polymer material dispersion is vacuum degassing using the same process as in step S1, then coated onto a second mold, and heated to form a polymer semi-crosslinked layer. This semi-crosslinked layer is then laid flat on one side of the positive electrode material layer and placed in an oven for heating and crosslinking curing to obtain the positive electrode structure. S3, Preparation of the self-powered friction structure: Several rubber tubes of uniform height are evenly distributed and vertically placed on the surface of the negative electrode structure, and the negative electrode polymer dispersion prepared in step S1 is injected into these rubber tubes. The prepared positive electrode structure is placed on top of the rubber tubes and placed in an oven for heating and crosslinking curing to complete the preparation of the self-powered friction structure.
[0015] As can be seen from the above description of the various embodiments of the present invention, compared with the prior art, the various embodiments of the present invention have the following advantages:
[0016] Beneficial effects:
[0017] In the first technical solution and related embodiments, the self-powered friction structure integrates a negative electrode structure, a positive electrode structure, and several elastic pillars through a one-piece molding process. The negative electrode structure comprises two layers of negative electrode material sandwiched between a conductive fabric layer, while the positive electrode structure consists of a positive electrode material layer and a base layer. The elastic pillars are evenly distributed and connect the negative and positive electrode material layers, forming a hollow structure. When the structure is subjected to external pressure, the negative electrode material layer overcomes the elastic force of the elastic pillars and generates electrical charge through friction with the positive electrode material layer. When the pressure decreases or disappears, the elastic pillars elastically recover, causing the negative and positive electrode material layers to separate, converting mechanical energy into electrical energy. This electrical energy is effectively conducted through the conductive fabric layer, providing power to related devices. This technology achieves self-powered functionality, providing stable power to devices without an external power source. Simultaneously, the one-piece molding design makes the structure more robust and improves its durability. Furthermore, the structure can be easily cut to size, adapting to the needs of large-scale production, and providing an efficient and reliable energy supply solution for wearable devices and other fields.
[0018] In the second technical solution and related embodiments, the self-powered triboelectric structure achieves efficient energy conversion by using an electronegative polymer material as the first and second negative electrode material layers, and an electronegatively positive, surface-insulating conductive yarn or polymer material as the positive electrode material layer. This material combination enables the structure to generate charge and electrical energy during pressing and separation, providing stable and reliable power support for wearable devices. Simultaneously, the selected materials ensure the stability and durability of the structure, resulting in a longer service life and better performance in practical applications.
[0019] In the third technical solution and related embodiments, polydimethylsiloxane, barium titanate-doped polydimethylsiloxane, polytetrafluoroethylene, polyvinyl chloride, or fluororubber are used as the materials for the first and second negative electrode material layers, combined with the materials for the positive electrode material layer. These materials all possess excellent electrical properties, ensuring effective generation of charge and electrical energy during external pressure and separation, providing stable and reliable power support for wearable devices or other electronic devices. Simultaneously, these materials also exhibit high durability and stability, maintaining their performance over long-term use and extending the lifespan of the self-powered triboelectric structure. Furthermore, materials such as polydimethylsiloxane possess excellent chemical stability and biocompatibility, enabling this self-powered triboelectric structure to operate safely and stably in various environments, expanding its application range.
[0020] In the fourth technical solution and related embodiments, conductive fabrics or conductive polymers are used as the conductive fabric layer. These conductive fabrics and conductive polymers have good conductivity, which can ensure the effective conduction of generated electrical energy during the operation of the self-powered friction structure, providing stable and reliable power support for related equipment. In addition, conductive fabrics and conductive polymers also have a certain degree of flexibility and cutability, which can adapt to the needs of self-powered friction structures of different shapes and sizes, facilitating large-scale production and application.
[0021] In the fifth technical solution and related embodiments, the conductive fabric layer is responsible for conducting the electrical energy generated by the self-powered friction structure. To ensure superior performance and controllable cost, the conductive fabric can be made of materials such as knitted silver cloth, woven silver cloth, and copper-nickel alloy cloth, all of which possess excellent conductivity and can efficiently transmit electrical energy to the required location. Simultaneously, these materials also exhibit excellent washability and comfort, ensuring stability during long-term use and user comfort. During the fabrication process, the thickness of the conductive fabric layer not only ensures stable conductivity but also achieves a thinner structure, thereby reducing the weight and volume of the entire self-powered friction structure. Furthermore, the thickness of the conductive fabric layer directly affects the content of the negative electrode material layer in the overall structure, allowing for further control over the electrical performance of the self-powered friction structure, such as key indicators like output voltage, current, and power, to meet the needs of different application scenarios.
[0022] In the sixth technical solution and related embodiments, a rubber tube made of rubber material is used as an elastic column. The rubber tube has good elasticity and resilience, and can deform when pressed and quickly return to its original shape after the pressure is removed. This allows the self-powered friction structure to smoothly achieve contact and separation between the negative electrode material layer and the positive electrode material layer when subjected to external pressure, thereby generating electrical energy. At the same time, the elasticity of the rubber tube also ensures the stability and durability of the structure, enabling it to maintain good working performance for a long time.
[0023] In the seventh technical solution and related embodiments, the hydrophobic polymer material possesses excellent hydrophobic properties, effectively preventing moisture from penetrating into the interior of the friction structure, thereby protecting the internal structure from the effects of a humid environment. This is crucial for ensuring the stability and reliability of the self-powered friction structure, especially when used in high-humidity environments. Controlling the thickness of the base layer to 0.5 mm allows for a thinner structure while maintaining hydrophobic properties, contributing to a reduction in the overall weight and volume of the self-powered friction structure.
[0024] In the eighth technical solution and related embodiments, the design of various shapes enables the self-powered friction structure to adapt to different application scenarios and needs. U-shaped, O-shaped, and C-shaped structures are common structural shapes, which can be selected and combined according to actual needs to meet the requirements of various complex shapes and sizes. Different structural shapes can adapt to different degrees of bending and twisting, allowing the self-powered friction structure to better fit onto wearable devices or other objects, improving energy conversion efficiency and user comfort.
[0025] In the ninth technical solution and related embodiments, the insole body is made using this self-powered friction structure, achieving energy self-sufficiency. The self-powered friction structure effectively converts external pressure and separation into electrical energy, providing stable power support for wearable devices within the insole. This avoids the limitations of traditional insoles that rely on external power sources, improving ease of use and flexibility. Part or all of the insole body can be made using the self-powered friction structure; the forefoot portion or the entire foot portion can be made using this structure, allowing for flexible adjustments based on specific needs and application scenarios. This insole is made of a single piece of fabric, with a tight and complete overall structure, containing no mechanical parts. This gives the insole excellent resilience, flexibility, and plasticity, allowing it to conform to different foot shapes and provide a comfortable wearing experience. Simultaneously, its washability and stability are excellent; even after multiple washes, it maintains its original shape and performance, ensuring long-term effectiveness.
[0026] In the tenth technical solution and related embodiments, the preparation method of the self-powered friction structure adopts a heating cross-linking and curing method, which enables the negative electrode polymer and hydrophobic polymer material to form a stable semi-cross-linked layer and firmly adhere to the conductive fabric layer and the positive electrode material. By vertically placing rubber tubes at equal intervals and injecting negative electrode polymer dispersion into them, the self-powered friction structure is constructed. The overall process is simple and easy to operate. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a self-powered friction structure for an embodiment;
[0029] Figure 2 This is a schematic diagram of the insole used in an embodiment;
[0030] Figure 3 This is a top view of the insole in an example embodiment;
[0031] Figure 4 The diagram shows a schematic of the negative electrode polymer dispersion being injected into an elastic column in an embodiment.
[0032] Figure 5 The output voltage diagram for a 1mm high elastic column in Example 1;
[0033] Figure 6 This is a diagram showing the output voltage of the entire insole when pressed using a 1mm high elastic column, as shown in Example 1.
[0034] Figure 7 Compare the output voltage diagram of the elastic column with a height of 1.5mm;
[0035] Figure 8 Compare the output voltage diagram of the elastic column with a height of 0.5mm in sample 2.
[0036] Explanation of key figure labels:
[0037] Negative electrode structure 1; Positive electrode structure 2; Elastic column 3; First negative electrode material layer 4; Conductive fabric layer 5; Second negative electrode material layer 6; Positive electrode material layer 7; Base layer 8. Detailed Implementation
[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0039] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.
[0040] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.
[0041] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.
[0042] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."
[0043] See Figures 1 to 4 , Figure 1 and Figure 2 A schematic diagram of a self-powered friction structure is shown; as follows: Figure 1 As shown, a self-powered friction structure includes a negative electrode structure 1, a positive electrode structure 2, and an elastic column 3.
[0044] The negative electrode structure 1 includes a first negative electrode material layer 4, a conductive fabric layer 5, and a second negative electrode material layer 6 connected in sequence, with the conductive fabric layer 5 located between the first negative electrode material layer 4 and the second negative electrode material layer 6.
[0045] Both the first negative electrode material layer 4 and the second negative electrode material layer 6 are made of the same electronegative polymer material. Specifically, the materials used for the first negative electrode material layer 4 and the second negative electrode material layer 6 are one of polydimethylsiloxane, barium titanate-doped polydimethylsiloxane, polytetrafluoroethylene, polyvinyl chloride, or fluororubber. In this embodiment, the first negative electrode material layer 4 and the second negative electrode material layer 6 are barium titanate-doped polydimethylsiloxane.
[0046] The conductive fabric layer 5 is a conductive fabric or a conductive polymer. Specifically, the conductive fabric layer 5 is one of knitted silver fabric, woven silver fabric, or copper-nickel alloy fabric, and its thickness is 0.08 mm. In this embodiment, the conductive fabric layer 5 is selected from copper-nickel alloy fabric with a resistance of less than 0.3 Ω.
[0047] In this embodiment, conductive fabric or conductive polymer is used as the conductive fabric layer 5. These conductive fabrics and conductive polymers have good conductivity, which can ensure the effective conduction of generated electrical energy during the operation of the self-powered friction structure, providing stable and reliable power support for related equipment. In addition, the conductive fabrics and conductive polymers also have a certain degree of flexibility and cutability, which can adapt to the needs of self-powered friction structures of different shapes and sizes, facilitating large-scale production and application.
[0048] In this embodiment, the conductive fabric layer 5 is responsible for conducting the electrical energy generated by the self-powered friction structure. To ensure superior performance and controllable cost, the conductive fabric can be made of materials such as knitted silver fabric, woven silver fabric, and copper-nickel alloy fabric, all of which possess excellent conductivity and can efficiently transmit electrical energy to the required location. Simultaneously, these materials also exhibit excellent washability and comfort, ensuring stability during long-term use and user comfort. During the fabrication process, the thickness of the conductive fabric layer 5 not only ensures stable conductivity but also achieves a thinner structure, thereby reducing the weight and volume of the entire self-powered friction structure. Furthermore, the thickness of the conductive fabric layer 5 directly affects the content of the negative electrode material layer in the overall structure, allowing for further control over the electrical performance of the self-powered friction structure, such as key indicators like output voltage, current, and power, to meet the needs of different application scenarios.
[0049] The positive electrode structure 2 includes a positive electrode material layer 7 and a base layer 8 that are connected to each other.
[0050] The positive electrode material layer 7 is made of electrically positive, surface-insulating conductive yarn or polymer material. The first negative electrode material layer 4 and the second negative electrode material layer 6 use different electrode materials than the positive electrode material layer 7. Specifically, the positive electrode material layer 7 is made of silver cloth, copper-nickel alloy cloth, or polymer material.
[0051] In this embodiment, the self-powered triboelectric structure achieves efficient energy conversion by using an electronegative polymer material as the first negative electrode layer 4 and the second negative electrode layer 6, and an electronegatively positive, surface-insulating conductive yarn or polymer material as the positive electrode layer 7. This material combination enables the structure to generate charge and electrical energy during pressing and separation, providing stable and reliable power support for wearable devices. Simultaneously, the selected materials ensure the stability and durability of the structure, resulting in a longer service life and better performance in practical applications.
[0052] The base layer 8 is a hydrophobic layer made of hydrophobic polymer material, and its thickness is 0.5 mm. In this embodiment, the base layer is a hydrophobic layer formed by thermosetting PDMS solution.
[0053] In this embodiment, the hydrophobic layer formed by thermosetting the PDMS solution exhibits excellent hydrophobic properties, effectively preventing moisture from penetrating into the interior of the friction structure and thus protecting the internal structure from the effects of a humid environment. This is crucial for ensuring the stability and reliability of the self-powered friction structure, especially when used in high-humidity environments. Controlling the thickness of the base layer 8 to 0.5 mm allows for a thinner structure while maintaining hydrophobic properties, contributing to a reduction in the overall weight and volume of the self-powered friction structure.
[0054] Elastic column 3, such as Figures 1 to 3 As shown, there are several elastic pillars 3 evenly distributed at equal intervals, connecting the second negative electrode material layer 6 and the positive electrode material layer 7 to form a hollow structure, thus isolating the second negative electrode material layer 6 and the positive electrode material layer 7. Specifically, the elastic pillars 3 are rubber tubes made of rubber material. In this embodiment, rubber tubes made of rubber material are used as elastic pillars 3. Rubber tubes have good elasticity and resilience, and can deform when pressed and quickly return to their original shape after the pressure is removed. This allows the self-powered friction structure to smoothly achieve contact and separation between the negative electrode material layer and the positive electrode material layer 7 when subjected to external pressure, thereby generating electrical energy. At the same time, the elasticity of the rubber tube also ensures the stability and durability of the structure, enabling it to maintain good working performance for a long time.
[0055] The negative electrode structure 1, the elastic column 3, and the positive electrode structure 2 are integrally formed. The self-powered friction structure can be U-shaped, O-shaped, or C-shaped, or a combination of these shapes. In this embodiment, the various shapes allow the self-powered friction structure to adapt to different application scenarios and needs. U-shaped, O-shaped, and C-shaped structures are common structural shapes, and they can be selected and combined according to actual needs to meet the requirements of various complex shapes and sizes. Different structural shapes can adapt to different degrees of bending and twisting, allowing the self-powered friction structure to better fit onto wearable devices or other objects, improving energy conversion efficiency and user comfort. This embodiment uses an O-shaped structure, which has good sealing and pressure resistance, and can maintain structural stability under external pressure.
[0056] The following is the working principle of the self-powered friction structure:
[0057] The first negative electrode material layer 4 is adapted to be pressed so that the second negative electrode material layer 6 overcomes the elastic force of the elastic column 3 and contacts the positive electrode material layer 7 along the first direction to generate charge through friction; when the pressing pressure is less than the elastic force of the elastic column 3, the elastic column 3 elastically recovers, and the first negative electrode material layer 4 moves relative to the positive electrode material layer 7 and separates along the extension direction of the first direction, generating voltage, which is conducted through the conductive fabric layer 5 to form current.
[0058] In this embodiment, the self-powered friction structure integrates a negative electrode structure 1, a positive electrode structure 2, and several elastic pillars 3 through a one-piece molding process. The negative electrode structure 1 comprises two layers of negative electrode material sandwiched with a conductive fabric layer 5, while the positive electrode structure 2 consists of a positive electrode material layer 7 and a base layer 8. The elastic pillars 3 are evenly distributed and connect the negative electrode material layer and the positive electrode material layer 7, forming a hollow structure. When the structure is subjected to external pressure, the negative electrode material layer overcomes the elastic force of the elastic pillars 3 and generates an electric charge through friction with the positive electrode material layer 7. When the pressure decreases or disappears, the elastic pillars 3 elastically recover, causing the negative electrode material layer to separate from the positive electrode material layer 7. In this process, mechanical energy is converted into electrical energy. This electrical energy is effectively conducted through the conductive fabric layer 5, providing power to related devices. This technology achieves self-powered functionality, providing stable power to devices without the need for an external power source. Simultaneously, the one-piece molding design makes the structure more robust and improves its durability. Furthermore, this structure can be easily cut to size, adapting to the needs of large-scale production, and providing an efficient and reliable energy supply solution for wearable devices and other fields.
[0059] An insole is characterized by comprising an insole body, wherein part or all of the insole body is made using the aforementioned self-powered friction structure. If only part of the structure is used, this part is typically placed in the forefoot area of the insole and tightly bonded to the other parts of the insole by sewing or gluing, thereby forming a complete insole. In this embodiment, the insole body is made using this self-powered friction structure, achieving energy self-sufficiency for the insole. The self-powered friction structure can effectively convert external pressure and separation into electrical energy, providing stable power support for wearable devices within the insole. This avoids the limitation of traditional insoles relying on external power sources, improving ease of use and flexibility. The insole body can be partially or entirely made using the self-powered friction structure; the forefoot area or the entire foot area can be made using this structure, allowing for flexible adjustment based on specific needs and application scenarios. This insole is made of a single piece of fabric, with a tight and complete overall structure, containing no mechanical parts. This gives the insole good resilience, flexibility, and plasticity, allowing it to conform to different foot shapes and provide a comfortable wearing experience. Meanwhile, its washability and stability are also excellent. Even after multiple washes, it can maintain its original shape and performance, ensuring long-term use. In this embodiment, under a frequency of 2Hz, the voltage and current of the insole remained stable after 100,000 presses.
[0060] A method for preparing a self-powered friction structure includes the following steps:
[0061] S1. Preparation of negative electrode structure 1: The prepared negative electrode polymer dispersion is subjected to vacuum degassing treatment, and then uniformly coated into the first mold. A semi-crosslinked layer of negative electrode polymer is formed by heating. This semi-crosslinked layer is laid flat on one side of the conductive fabric layer 5 and placed in an oven for heating and crosslinking curing. The same steps are used to complete the crosslinking curing of the negative electrode polymer on the other side of the conductive fabric layer 5 to form a complete negative electrode structure 1.
[0062] S2. Preparation of positive electrode structure 2: The prepared hydrophobic polymer material dispersion is vacuum degassed using the same process as in step S1, then coated onto the second mold, and a polymer semi-crosslinked layer is formed by heating. This semi-crosslinked layer is then laid flat on one side of the positive electrode material layer 7 and placed in an oven for heating and crosslinking curing to obtain positive electrode structure 2.
[0063] S3. Preparation of self-powered friction structure: Several rubber tubes of the same height are placed vertically at equal intervals on the surface of negative electrode structure 1, and the negative electrode polymer dispersion prepared in step S1 is injected into these rubber tubes; the prepared positive electrode structure 2 is placed on top of the rubber tubes, and the whole structure is placed in an oven for heating, crosslinking and curing to complete the preparation of self-powered friction structure.
[0064] In the above steps, the first mold and the second mold are made of smooth polypropylene plates, metal plates, or glass plates. The thickness of the first negative electrode material layer 4 or the second negative electrode material layer 6 can be controlled by changing the thickness of the edges of the first mold and the second mold.
[0065] Example 1
[0066] The first negative electrode material layer 4 and the second negative electrode material layer 6 are made of polydimethylsiloxane, the conductive fabric layer 5 is made of copper-nickel alloy cloth, the positive electrode material layer 7 is made of positively charged copper-plated fabric (copper-nickel alloy cloth), the base layer 8 is made of polydimethylsiloxane, and the elastic column 3 is made of hollow rubber tube with a diameter of 5 mm and a height of 1 mm (1 mm silicon tube height).
[0067] The specific preparation process is as follows:
[0068] S1. Preparation of Negative Electrode Structure 1: Polydimethylsiloxane and a curing agent are added in a 10:1 ratio. To improve the contact separation power generation efficiency between the triboelectric layers, barium titanate (a high-dielectric material) or PTFE (a triboelectric negative electrode material) can be added. Next, the prepared solution is thoroughly mixed and vacuum-treated to eliminate air bubbles. Then, the treated solution is poured into a pre-designed first mold and evenly coated to a thickness of 0.5 mm. The first mold is placed in an oven and baked at 70°C for 8 minutes to pre-cur it. After removal, a copper-nickel fabric of appropriate size is attached to the pre-cured material and gently pressed to expel internal air, ensuring a tight fit. The insole is then placed in the oven again and baked at 70°C for 30 minutes to fully cure it. Following the same steps, the cross-linking and curing of the negative electrode polymer on the other side of the conductive fabric layer 5 is completed, ultimately forming the complete negative electrode structure 1.
[0069] S2. Preparation of positive electrode structure 2: The prepared hydrophobic polymer dispersion (polydimethylsiloxane) is vacuum degassed using the same process as in step S1, then coated onto the second mold and heated to form a hydrophobic semi-crosslinked layer; this semi-crosslinked layer is laid flat on one side of the copper-plated fabric and placed in an oven for heating and crosslinking curing to obtain positive electrode structure 2.
[0070] S3. Preparation of self-powered friction structure: such as Figure 4 As shown, a 5mm diameter hollow rubber tube is cut into 1mm lengths and placed at equal intervals (15mm) between the prepared positive and negative friction layers as an elastic insulating material for contact separation; the negative electrode polymer dispersion prepared in step S1 is injected into these hollow rubber tubes; finally, the whole structure is placed in an oven for heating and cross-linking curing to complete the preparation of the self-powered friction structure.
[0071] like Figure 5 As shown, the output voltage obtained by pressing the sample of Example 1 with the pressing head on the measuring device shows that the output voltage of Example 1 is stable.
[0072] like Figure 6 As shown, the voltage output of the entire insole after pressing can be seen to indicate that the insole prepared by this method has a stable output voltage.
[0073] Comparison Sample 1
[0074] The difference between Comparison Sample 1 and Example 1 lies in the height of the elastic column 3. In this example, the elastic column 3 is a hollow rubber tube with a diameter of 5mm and a height of 1.5mm (1.5mm silicone tube height).
[0075] like Figure 7As shown, the output voltage is obtained by pressing the sample of comparison sample one using the pressing head on the measuring device.
[0076] Comparison Sample 2
[0077] The difference between Sample 2 and Example 1 lies in the height of the elastic column 3. In this example, the elastic column 3 is a hollow rubber tube with a diameter of 5mm and a height of 0.5mm (0.5mm silicone tube height).
[0078] like Figure 8 As shown, the output voltage is obtained by pressing the sample of comparison sample 2 with the pressing head on the measuring device.
[0079] This application provides a self-powered friction structure, its preparation method, and an insole. This self-powered friction structure is not only simple to manufacture, but also achieves integrated molding, has high durability and stable voltage output, and is easy to cut into any shape to meet the needs of large-scale production.
[0080] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.
Claims
1. A self-powered friction structure, characterized in that, The self-powered friction structure comprises a negative electrode structure (1), a positive electrode structure (2) and a plurality of elastic columns (3). The negative electrode structure (1) comprises a first negative electrode material layer (4), a conductive fabric layer (5) and a second negative electrode material layer (6) connected in sequence, wherein the conductive fabric layer (5) is located between the first negative electrode material layer (4) and the second negative electrode material layer (6); The positive electrode structure (2) comprises a positive electrode material layer (7) and a base layer (8) connected to each other; and The elastic columns (3) are evenly distributed and connected to the second negative electrode material layer (6) and the positive electrode material layer (7) to form a hollow structure, so as to isolate the second negative electrode material layer (6) and the positive electrode material layer (7); The first negative electrode material layer (4) and the second negative electrode material layer (6) are made of different electrode materials from the positive electrode material layer (7); the first negative electrode material layer (4) and the second negative electrode material layer (6) are made of the same high-molecular polymer material with electronegativity, and the positive electrode material layer (7) is made of surface-insulated conductive yarn or high-molecular polymer material with electropositivity; The first negative electrode material layer (4) is adapted to be pressed to make the second negative electrode material layer (6) overcome the elastic force of the elastic column (3) and contact the positive electrode material layer (7) in a first direction to generate electric charges by friction; when the pressing force is less than the elastic force of the elastic column (3), the elastic column (3) elastically returns, the first negative electrode material layer (4) moves and separates relative to the positive electrode material layer (7) in the extension direction of the first direction to generate voltage, and the voltage is conducted through the conductive fabric layer (5) to form current; The conductive fabric layer (5) is made of conductive fabric or conductive high-molecular polymer; and the elastic column (3) is made of rubber tube of rubber material. The negative electrode structure (1), the elastic column (3) and the positive electrode structure (2) are integrally formed.
2. A self-powered friction structure as claimed in claim 1, characterized in that The first negative electrode material layer (4) and the second negative electrode material layer (6) are made of one of polydimethylsiloxane, barium titanate doped polydimethylsiloxane, polytetrafluoroethylene, polyvinyl chloride and fluororubber.
3. A self-powered friction structure as claimed in claim 1, wherein, The conductive fabric is one of knitted silver cloth, woven silver cloth and copper-nickel alloy cloth, and the thickness is 0.08 mm.
4. A self-powered friction structure as claimed in claim 1, wherein, The base layer (8) is a hydrophobic layer made of hydrophobic high-molecular material, and the thickness of the base layer (8) is 0.5 mm.
5. A self-powered friction structure as claimed in claim 1, wherein, The self-powered friction structure is in one of U-shaped, O-shaped and C-shaped or a combination of multiple shapes.
6. An insole characterized by, The insole body is partially or entirely made of the self-powered friction structure according to any one of claims 1 to 5.
7. A method for preparing a self-powered friction structure, characterized in that, The method for manufacturing the self-powered friction structure according to any one of claims 1 to 5 comprises the following steps: S1, preparation of the negative electrode structure (1): the prepared negative electrode polymer dispersion liquid is subjected to vacuum bubble removal treatment, then is uniformly coated on a first mold, and is heated to form a negative electrode polymer semi-crosslinked layer; the semi-crosslinked layer is laid on one side of the conductive fabric layer (5) and is placed in an oven for heating, crosslinking and curing; the other side of the conductive fabric layer (5) is crosslinked and cured in the same way to form a complete negative electrode structure (1); S2, preparation of the positive electrode structure (2): the prepared hydrophobic polymer material dispersion is treated by vacuum degassing in the same way as step S1, then coated in the second mold, and a semi-crosslinked polymer layer is formed by heating, then the semi-crosslinked layer is laid on one side of the positive electrode material layer (7), and placed in an oven for heating, crosslinking and curing to obtain the positive electrode structure (2); S3, preparation of the self-powered friction structure: a plurality of rubber tubes with uniform height are evenly distributed and vertically placed on the surface of the negative electrode structure (1), and the prepared negative electrode polymer dispersion in step S1 is injected into the rubber tubes; the prepared positive electrode structure (2) is placed above the rubber tubes, and the whole is placed in an oven for heating, crosslinking and curing to complete the preparation of the self-powered friction structure.
Citation Information
Patent Citations
Self-powered friction structure and insole
CN222264546U