Self-powered yarn and method of making same

Abstract

The application discloses a kind of self-powered yarn and preparation method thereof, wherein a kind of preparation method of self-powered yarn, comprising the following steps: S1, PDMS main agent and auxiliary agent are mixed uniformly to obtain PDMS solution;S2, double copper silver-plated metal wire is used as core yarn, PDMS solution is used as skin layer material, and conductive core yarn A is prepared by coaxial wet spinning technology;S3, polyester filament is immersed in prepared alumina nanofluid electrolyte, and coated fiber B is obtained by drying treatment;S4, using ring spinning process, coated fiber B is evenly coated on conductive core yarn A, to form composite fiber C;S5, conductive core yarn A is wrapped on composite fiber C, PDMS solution is used as skin layer material, and self-powered yarn is prepared by coaxial wet spinning technology.The application provides a kind of self-powered yarn and preparation method thereof, the preparation method is simple, and the self-powered yarn prepared by the preparation method has flexibility and waterproof performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a self-powered yarn and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the information age, the Internet of Things technology has made great progress. In our daily life and industrial production, various types of sensing devices are playing an increasingly important role, such as health monitoring, intelligent transportation, smart home, environmental protection, video monitoring and industrial safety, etc. All of these fields require a large number of sensors to provide real-time and accurate signal support. These sensors need stable and reliable power supply to ensure their continuous and efficient work. As a new technology, triboelectric nanogenerator collects mechanical energy from the environment and converts it into electrical energy, providing a self-powered solution for sensors in the Internet of Things without external power supply. This technology not only recycles energy, but also is environmentally friendly and does not produce pollution. Therefore, the application prospect of triboelectric nanogenerator in the field of Internet of Things is broad. However, triboelectric nanogenerator faces an important problem in practical application: the influence of humidity. When the triboelectric nanogenerator is exposed to a humid environment, the electric charge generated by the triboelectric material is easily dissipated, leading to a decrease in charge transfer performance, which in turn affects the output of electrical energy. This humidity greatly limits the application of triboelectric nanogenerator in high humidity environment. Although there have been some attempts to overcome the negative effects of moisture through surface hydrophobic treatment, etc., in actual life, mechanical movement under water-containing conditions is inevitable. Therefore, in addition to moisture resistance, the waterproof performance of triboelectric nanogenerator is also important. Currently, research on the waterproof and high humidity resistance of triboelectric nanogenerator mostly focuses on thin film and fabric-based materials, while the research on yarn-based materials is relatively less. However, yarn is the basic unit of clothing, and integrating triboelectric yarn into clothing not only is easier, but also has greater application potential. Therefore, developing a self-powered yarn with flexibility and waterproof performance is of great significance for the development of human motion signal monitoring and sensor devices. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems existing in the background art, and provides a self-powered yarn and a preparation method thereof. The preparation method is simple, and the self-powered yarn prepared by the preparation method exhibits good flexibility and waterproof performance, realizing dual energy supply in dry and underwater environments.

[0004] To achieve the above-mentioned purpose, each embodiment of the present application adopts the following technical solutions, but is not limited to the following solutions:

[0005] The first technical solution relates to a preparation method of a self-powered yarn, comprising the following steps: S1, configuring a PDMS solution: uniformly mixing a polydimethylsiloxane (PDMS) main agent and an auxiliary agent according to a predetermined ratio to obtain the PDMS solution; S2, preparing a conductive core yarn A: using a double-stranded copper-plated silver wire as the core yarn and the PDMS solution as the skin layer material, the conductive core yarn A is prepared by a coaxial wet spinning technology; S3, preparing a coated fiber B: adding appropriate amounts of potassium hydroxide, nano-zinc oxide powder and gas-phase nano-aluminum oxide powder into water, and after ultrasonic treatment, the mixture is fully stirred to form a uniform aluminum oxide nanofluid electrolyte; the polyester filament is immersed in the electrolyte, and after drying treatment, the coated fiber B coated with the aluminum oxide nanofluid electrolyte is obtained; S4, preparing a composite fiber C: using a ring spinning process, the coated fiber B obtained in step S3 is uniformly coated on the conductive core yarn A prepared in step S2 to form the composite fiber C; S5, preparing a self-powered yarn: the conductive core yarn A prepared in step S2 is wrapped around the composite fiber C obtained in step S4 as a new core yarn; the PDMS solution configured in step S1 is used as the skin layer material again, and the self-powered yarn is prepared by the coaxial wet spinning technology.

[0006] S4, preparing a composite fiber C: using a ring spinning process, the coated fiber B obtained in step S3 is uniformly coated on the conductive core yarn A prepared in step S2 to form the composite fiber C; S5, preparing a self-powered yarn: the conductive core yarn A prepared in step S2 is wrapped around the composite fiber C obtained in step S4 as a new core yarn; the PDMS solution configured in step S1 is used as the skin layer material again, and the self-powered yarn is prepared by the coaxial wet spinning technology.

[0007] The second technical solution is based on the first technical solution, wherein in step S1, the auxiliary agent is a PDMS curing agent, and the ratio of the PDMS main agent to the auxiliary agent is 10:1.

[0008] The third technical solution is based on the second technical solution, wherein in step S1, the specific operation of the mixing treatment is as follows: the mixed solution of the PDMS main agent and the auxiliary agent is placed in a container under normal temperature conditions, and is stirred vigorously for 30 minutes; the mixed solution is placed in a vacuum oven for defoaming treatment for 20 minutes to obtain the PDMS solution.

[0009] The fourth technical solution is based on the first technical solution, wherein in steps S2 and S5, when the coaxial wet spinning is performed, an oil bath at 130 DEG C is used as the coagulation bath.

[0010] The fifth technical solution is based on the first technical solution, wherein in step S3, the configuration of the aluminum oxide nanofluid electrolyte is as follows: the content of potassium hydroxide is 30wt%, the content of nano-zinc oxide powder is 3wt% to 5wt%, and the content of gas-phase nano-aluminum oxide powder is 1wt% to 4wt%.

[0011] The sixth technical solution is based on the fifth technical solution, wherein in step S3, the ultrasonic treatment time is 30 minutes, and the stirring time is 2 hours.

[0012] The seventh technical solution is based on the sixth technical solution, wherein, in step S3, the polyester filament is fully immersed in the prepared alumina nanofluid electrolyte for 10 minutes, and then the immersed polyester filament is placed in a normal temperature environment for drying.

[0013] The eighth technical solution is based on the first technical solution, wherein, in step S4, the specific operation of the ring spinning process is that the conductive core yarn A and the wrapping fiber B are respectively wound on two bobbins of a ring spinning frame to ensure uniform and stable yarn tension; the conductive core yarn A is used as the core yarn, and the wrapping fiber B is used as the outer wrapping yarn, and the ring spinning frame is used for twisting operation.

[0014] The ninth technical solution is based on the first technical solution, wherein, in step S5, the conductive core yarn A is wrapped on the composite fiber C at an angle of 60°.

[0015] The tenth technical solution is based on any one of the first to ninth technical solutions, wherein the self-powered yarn is prepared by using the preparation method of the self-powered yarn.

[0016] From the above description of the various embodiments of the present application, compared with the prior art, the various embodiments of the present application have the following advantages

[0017] Advantages:

[0018] In the first technical solution and related embodiments, through simple polydimethylsiloxane (PDMS) solution configuration, easy-to-operate coaxial wet spinning process and optimized structure design, efficient preparation of self-powered yarn is realized. The prepared yarn not only has excellent flexibility and electrical properties, but also can maintain stable working state in various environments. The configuration process of PDMS solution is simple, which makes the whole preparation process more efficient. At the same time, the use of coaxial wet spinning process makes the fiber preparation operation simple and easy to control, which provides the possibility for continuous production. During the preparation process, the combination of conductive core yarn A and wrapping fiber B adopts a specific designed angle and wrapping method, which not only ensures the flexibility of the yarn, but also makes its electrical properties stable. The self-powered yarn prepared by coaxial wet spinning technology has uniform fiber structure and good mechanical properties. This makes the yarn maintain stable form and performance when subjected to external force, enhancing its durability in practical application. In addition, the use of PDMS as the skin material endows the yarn with excellent waterproof performance and flexibility. This makes the yarn maintain stable electrical properties in humid or liquid environment, while maintaining its original flexibility and comfort. Although the polyester immersed in the electrolyte is easy to absorb moisture in the air, which may affect the electrical properties of the yarn, the protection of PDMS makes the electrical properties of the yarn stable and long-lasting under water.

[0019] In the second technical solution and related embodiments, the auxiliary agent is a PDMS curing agent, and its addition is to realize the curing process of PDMS.

[0020] In the third technical solution and related embodiments, in step S1, through specific mixing processing conditions, the sufficient mixing and stabilization of the PDMS main agent and the auxiliary agent are realized. This processing process is carried out at room temperature, avoiding the chemical reactions that may be triggered by high temperature, and ensuring the stability of the material properties. The vigorous stirring lasts for 30 minutes, ensuring the uniform mixing between the main agent and the auxiliary agent, providing a basis for the subsequent spinning process. Subsequently, the mixed solution is placed in a vacuum oven for defoaming treatment, and the defoaming time is 20 minutes. This step effectively removes the bubbles in the solution, avoiding the structural defects or performance decline that may be caused by bubbles in the spinning process. The finally obtained PDMS solution is stable and bubble-free, providing a reliable skin material for preparing high-quality self-powered yarns.

[0021] In the fourth technical solution and related embodiments, through the action of oil bath, the PDMS skin layer can be quickly and effectively cured to form a stable conductive core yarn A structure, improving the performance and quality of the yarn.

[0022] In the fifth technical solution and related embodiments, by accurately controlling the content of each component of the electrolyte, the stability and performance of the electrolyte can be ensured, which in turn affects the quality of the coated fiber B and the performance of the self-powered yarn.

[0023] In the sixth technical solution and related embodiments, the ultrasonic treatment time is set to 30 minutes. Ultrasonic treatment can promote the formation, oscillation and rupture of micro-bubbles in the liquid through high-frequency vibration, producing strong local impact force and shear force, thereby effectively dispersing and mixing the components in the solution. The 30-minute ultrasonic treatment time can ensure that the nanoparticles in the electrolyte are fully dispersed and uniformly distributed, avoiding the occurrence of agglomeration or sedimentation, thereby improving the quality of the coated fiber B. The stirring time is set to 2 hours, and the stirring is to better dissolve and disperse the nano-powder.

[0024] In the seventh technical solution and related embodiments, the polyester filament is completely immersed in the prepared aluminum oxide nanofluid electrolyte, ensuring that the fiber surface is uniformly coated with the electrolyte. Subsequently, the immersed polyester filament is placed in a room temperature environment for drying, and the excess water on the fiber surface is removed by natural evaporation, so that the electrolyte is firmly attached to the fiber surface to form the coated fiber B. The conditions of room temperature drying are not only simple and easy to implement, but also help to maintain the stability of the performance of the fiber.

[0025] In the eighth technical solution and related embodiments, during the twisting process, the coated fiber B is uniformly coated on the outer surface of the conductive core yarn A to form a compact composite structure. Through the application of the ring spinning process, a composite fiber C with excellent mechanical and electrical properties can be obtained, providing a reliable material basis for subsequent preparation of self-powered yarn.

[0026] In the ninth technical solution and related embodiments, the conductive core yarn A is tightly wrapped around the composite fiber C at an angle of 60°. This design not only enhances the structural stability of the yarn, but also helps to optimize its self-powering performance, making the final self-powered yarn more reliable and efficient.

[0027] In the tenth technical solution and related embodiments, the self-powered yarn prepared by the preparation method of the self-powered yarn exhibits good flexibility and waterproof performance, and can maintain a stable working state in various environments. Whether in a dry environment or underwater environment, the yarn can maintain stable electrical properties and achieve continuous power supply. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 The preparation method of the self-powered yarn of the embodiment is shown in the figure.

[0030] Figure 2 The voltage graph and super-depth image of the self-powered yarn of Example 1 after multiple immersions in water are shown in the figure.

[0031] Figure 3 The voltage comparison graph of Example 1 and Comparative Example 1 is shown in the figure.

[0032] Figure 4 The comparison graph of Example 2 and Comparative Example 2 is shown in the figure.

[0033] Figure 5 The voltage comparison graph of two yarns with different angles of Example 3 is shown in the figure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as excluding other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] In the claims, the specification, and the drawings of the present application, terms such as "first", "second", and "third" are used merely to distinguish one element from another, and do not necessarily have particular spatial or chronological orders.

[0036] In the claims, the specification, and the drawings of the present application, terms such as "central", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" are used to indicate the spatial or positional relationship based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0037] In the claims, the specification, and the drawings of the present application, terms such as "fixedly connected" or "fixedly connected" should be understood broadly, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0038] In the claims, the specification, and the drawings of the present application, the terms "include", "have" and their variants are intended to mean "including but not limited to".

[0039] Referring to Figures 1 to 5 , Figure 1 A schematic diagram of a preparation method of a self-powered yarn is shown; as Figure 1 shown, a preparation method of a self-powered yarn includes the following steps:

[0040] S1, configure a PDMS solution: uniformly mix a polydimethylsiloxane (PDMS) main agent and an auxiliary agent according to a predetermined ratio to obtain a stable PDMS solution.

[0041] S2, prepare a conductive core yarn A: use a double-stranded copper-plated silver wire as a core yarn, use the PDMS solution as a skin layer material, and prepare the conductive core yarn A by coaxial wet spinning technology.

[0042] S3, prepare a coated fiber B: add an appropriate amount of potassium hydroxide, nano zinc oxide powder and gas phase nano aluminum oxide powder in water, and after ultrasonic treatment, fully stir to form a uniform aluminum oxide nanofluid electrolyte; then, dip the polyester filament in the electrolyte, and through drying treatment, obtain the coated fiber B coated with the aluminum oxide nanofluid electrolyte.

[0043] S4, preparing composite fiber C: using ring spinning process, the coated fiber B obtained in step S3 is uniformly coated on the conductive core yarn A prepared in step S2 to form the composite fiber C.

[0044] S5, preparing self-powered yarn: the conductive core yarn A prepared in step S2 is wrapped on the composite fiber C obtained in step S4 as a new core yarn; using the PDMS solution configured in step S1 as the skin material again, a self-powered yarn is prepared by coaxial wet spinning technology.

[0045] Specifically, in step S1, the auxiliary agent is a PDMS curing agent, and the ratio of the PDMS main agent to the auxiliary agent is 10:1. In this embodiment, the auxiliary agent is added to enable the PDMS to solidify.

[0046] Specifically, in step S1, the specific conditions of the mixing process are as follows: the PDMS main agent and the auxiliary agent mixed solution are placed in a container under normal temperature conditions, and are subjected to vigorous stirring for 30 minutes; then, the mixed solution is placed in a vacuum oven for defoaming treatment, and the defoaming time is 20 minutes, to obtain a stable PDMS solution. In this embodiment, through the specific mixing process conditions, the PDMS main agent and the auxiliary agent are fully mixed and stabilized. This process is carried out under normal temperature conditions, avoiding the chemical reactions that may be triggered by high temperature, and ensuring the stability of the material properties. Vigorous stirring for 30 minutes ensures uniform mixing between the main agent and the auxiliary agent, providing a basis for the subsequent spinning process. Then, the mixed solution is placed in a vacuum oven for defoaming treatment, and the defoaming time is 20 minutes. This step effectively removes bubbles in the solution, avoiding structural defects or performance degradation that may be caused by bubbles in the spinning process. The final PDMS solution is stable and bubble-free, providing a reliable skin material for the preparation of high-quality self-powered yarns.

[0047] In step S2, when performing coaxial wet spinning, an oil bath at 130°C is used as the coagulation bath. In the specific operation, first, two copper-plated silver wires are cabled, and then passed through the core layer of the coaxial needle. Next, the defoamed PDMS solution is placed in a syringe and pushed into the skin layer of the coaxial needle at a speed of 30ml / h. In this process, ensure that the needle is perpendicular to the 130°C oil bath and maintains a constant distance of 10mm from the oil surface. Then, collect at a speed of 15r / min to prepare the conductive core yarn. Finally, in order to remove the oil stains on the surface of the conductive core yarn, it is immersed in an isopropanol solution diluted with water. In this embodiment, through the action of the oil bath, the PDMS skin layer can be quickly and effectively solidified to form a stable conductive core yarn A structure, improving the performance and quality of the yarn.

[0048] Specifically, in step S3, the configuration of the alumina nanofluid electrolyte is as follows: the content of potassium hydroxide is controlled at 30wt%, the content of nano-zinc oxide powder is 3wt% to 5wt%, and the content of fumed nano-alumina powder is 1wt% to 4wt%. The electrolyte is subjected to ultrasonic treatment for 30 minutes to ensure that the components are fully mixed and uniform. Then, stirring is performed for up to 2 hours to better dissolve and disperse the nano-powder. The polyester filament is soaked in the prepared alumina nanofluid electrolyte for 10 minutes to ensure that it fully absorbs the electrolyte. Finally, the soaked polyester filament is dried in a normal temperature environment to remove excess moisture and fix the distribution of the electrolyte on the fiber. Finally, the coated fiber B coated with the alumina nanofluid electrolyte is obtained. In this embodiment, the size of the nano-zinc oxide powder is 30nm, and the size of the fumed nano-alumina powder is 100nm.

[0049] Specifically, in step S4, the specific operation of the ring spinning process is as follows: first, the conductive core yarn A and the coated fiber B are wound on two bobbins of the ring spinning frame respectively to ensure uniform and stable yarn tension. Then, the conductive core yarn A is used as the core yarn and the coated fiber B is used as the outer covering yarn to perform twisting operation by the ring spinning frame. In this embodiment, the operation process is as follows: first, the coated fiber B is fed from the rear nip of the rear roller, then the fiber passes through the rear roller, the intermediate roller and the front roller in turn, and finally is output from the front nip of the front roller. At the same time, the conductive core yarn A is fed from the rear nip of the front roller and also output from the front nip of the front roller. Next, the conductive core yarn A and the coated fiber B are collected in the front zone, at this time the coated fiber B is coated on the outer surface of the conductive core yarn A by twisting. Finally, the steel ring is wound on the bobbin to complete the preparation process of the composite fiber C. In this embodiment, during the twisting process, the coated fiber B is uniformly coated on the outer surface of the conductive core yarn A to form a compact composite structure. Through the application of the ring spinning process, the composite fiber C with excellent mechanical and electrical properties can be obtained, which provides a reliable material basis for the subsequent preparation of self-powered yarn.

[0050] Specifically, in step S5, the conductive core yarn A is wrapped around the composite fiber C at an angle of 60°. In this embodiment, the conductive core yarn A is tightly wrapped around the composite fiber C at an angle of 60°. This design not only enhances the structural stability of the yarn, but also helps to optimize its self-power performance, making the final self-powered yarn more reliable and efficient. In step S5, the PDMS solution carefully prepared in step S1 is again used as the skin material to prepare a self-powered yarn by coaxial wet spinning technology. When performing coaxial wet spinning, the same as step 2, 130°C oil bath is still used as the coagulation bath. The specific operation is the same as step 2.

[0051] A self-powered yarn is prepared by the above method. In this embodiment, the self-powered yarn prepared by the above method exhibits good flexibility and waterproof performance, and can maintain a stable working state in various environments, whether in a dry environment or underwater environment. The yarn can maintain stable electrical performance and achieve continuous power supply.

[0052] Example 1

[0053] 1) Preparation of PDMS solution: At room temperature, mix the main agent and the auxiliary agent of PDMS at a ratio of 10:1, and stir vigorously for 30 minutes to ensure uniform mixing. Then, put the mixed solution into a vacuum oven to remove bubbles for 20 minutes, and finally obtain the PDMS solution.

[0054] 2) Preparation of conductive core yarn: First, two copper-silver-plated wires are cabled, and then passed through the core layer of a coaxial needle. Next, the defoamed PDMS solution is injected into the syringe at a speed of 30 ml / h, and pushed into the skin layer of the coaxial needle. During the operation, ensure that the needle is perpendicular to the oil bath at 130℃, and maintain a distance of 10mm from the oil surface. Finally, collect the fiber at a speed of 15r / min, thereby preparing the conductive core yarn. In order to remove the oil stains on the surface of the core yarn, immerse it in an isopropanol solution diluted with water.

[0055] 3) Preparation of coated fiber: First, add 30wt% potassium hydroxide particles to water, and mix 3wt%-5wt% nano-zinc oxide powder to prepare an electrolyte. Then, add 1wt%-4wt% gas-phase nano-aluminum oxide powder to the electrolyte, and perform ultrasonic treatment for 30 minutes, followed by stirring for 2 hours, to obtain an aluminum oxide nanofluid electrolyte. Next, immerse the polyester fiber in the electrolyte for 10 minutes, and then dry at room temperature, thereby preparing the coated fiber B.

[0056] 4) Preparation of composite fiber: The coated fiber B is fed from the rear jaw of the rear roller, passes through the rear roller, the middle roller and the front roller, and is output from the front jaw of the front roller. At the same time, the conductive core yarn A is also fed from the rear jaw of the front roller, and is also output from the front jaw of the front roller. Then, the conductive core yarn A and the coated fiber B are collected in the front zone, and the coated fiber B is wrapped around the outer surface of the conductive core yarn A by twisting. Finally, the steel wire ring is wound on the bobbin to form the composite fiber C.

[0057] 5) Preparation of self-powered yarn: The conductive core yarn A is wrapped around the composite fiber C at an angle of 60°. Then, this combination is passed through the core layer of the coaxial needle. Next, the defoamed PDMS solution is used again, and the syringe is filled at a speed of 40 ml / h and advanced to the skin layer of the coaxial needle. During this process, the needle is kept at a vertical distance of 130°C oil bath and ensures a distance of 10 mm from the oil surface. Finally, the fiber is collected at a speed of 15 r / min, thereby obtaining the self-powered yarn. In order to remove the oil stains on the surface of the yarn, it is also immersed in an isopropanol solution diluted with water.

[0058] In order to evaluate the power supply capability of the yarn, the present application adopts a voltage diagram to represent it. Specifically, the yarn sample (length of 3.5 cm) is connected to the test equipment, and by measuring its output voltage under certain conditions, a voltage diagram is drawn. At the same time, in order to more intuitively show the structural characteristics of the yarn, the present application adopts a super-depth-of-field image technology.

[0059] Figure 2 Voltage diagram and super-depth-of-field image of Example 1 after multiple immersions in water.

[0060] Figure 2 (a) The figure shows the voltage diagram of Example 1 after multiple immersions in water. As can be seen from the figure, after three immersions, the voltage curve of the self-powered yarn remains relatively stable, and there is no obvious voltage drop or fluctuation. This indicates that the self-powered yarn prepared in Example 1 has good waterproof performance, and its power supply capability can be effectively maintained even after multiple immersions.

[0061] Figure 2 (b) The figure shows the super-depth-of-field image of the self-powered yarn of Example 1, from which the internal structure of the yarn can be clearly observed.

[0062] Comparative Example 1

[0063] The difference between Comparative Example 1 and Example 1 lies in the number of copper-silver-plated metal wires in the conductive core yarn in step S2. In this embodiment, one copper-silver-plated metal wire is used to pass through the core layer of the coaxial needle.

[0064] It can be seen that there is indeed a difference in the voltage performance of the self-powered yarn between Example 1 and Comparative Example 1. Figure 3

[0065] (a) The figure shows the voltage diagram of the self-powered yarn of Example 1. As can be seen from the figure, the voltage curve of Example 1 is relatively smooth, and the overall voltage level is relatively high. This indicates that under the process conditions of Example 1, the power supply performance of the yarn is good, and the voltage output is stable. Figure 3

[0066] Figure 3 ​(b) Figure shows the voltage graph of the self-powered yarn of the comparative example one. Compared with (a) figure, the voltage curve of the comparative example one also presents a certain voltage level, but the overall voltage is slightly lower than that of the example one.

[0067] Comparative example two

[0068] The difference between the comparative example two and the example one lies in the omission of step S3, i.e. no preparation process of coated fibers. In this example, step S3 is omitted, i.e. no preparation of aluminum oxide nanofluid electrolyte and no impregnation of polyester fibers in such electrolyte. The original polyester fibers are directly used in this example without any coating treatment.

[0069] From the comparison of Figure 4 , it can be clearly seen that there is a significant difference in the voltage performance of the self-powered yarn between the example one and the comparative example two.

[0070] Figure 4 (a) Figure shows the voltage graph of the self-powered yarn of the example one. As can be seen from the figure, the voltage curve of the example one is stable and high, indicating good power supply performance.

[0071] Figure 4 (b) Figure shows the voltage graph of the self-powered yarn of the comparative example two. In comparison, the voltage curve of the comparative example two is obviously lower.

[0072] Comparative example three

[0073] The main difference between the comparative example three and the example one lies in the wrapping angle between the conductive core yarn A and the composite fiber C in step S5. In the example one, the conductive core yarn A is wrapped at an angle of 60° on the composite fiber C. In the comparative example three, two different angles are used for comparison experiments. Specifically, the conductive core yarn A is wrapped at an angle of 30° or 80° on the composite fiber C. The selection of these two angles is to explore the influence of the angle size on the performance of the self-powered yarn.

[0074] From Figure 5 , we can clearly see the significant difference in the voltage of the self-powered yarn between the example one and the comparative example three.

[0075] Figure 5 (a) Figure shows the voltage graph of the power supply yarn of the example one. As can be seen, the voltage curve of the example one presents a higher voltage level.

[0076] Figure 5 (b) Figure shows the voltage graph of the self-powered yarn when the yarn angle is 30° in the comparative example three. Compared with (a) figure, the voltage is low.

[0077] Figure 5(c) The graph shows the self-powered yarn voltage graph of the yarn included angle of 80° in Comparative Example Three. Compared with (a), when the included angle is increased to 80°, the voltage level is lower.

[0078] The application provides a self-powered yarn and a preparation method thereof. The preparation method is simple, the self-powered yarn prepared by the preparation method has good flexibility and waterproof performance, and realizes double energy supply in dry and underwater environments.

[0079] The above description and embodiment are used to explain the protection scope of the application, but do not constitute the limitation of the protection scope of the application. Through the inspiration of the application or the above embodiment, the modification, equivalent replacement or other improvement of the embodiment of the application or one part of the technical features can be obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge and / or the prior art in the field, through the logical analysis, reasoning or limited test, which should be included in the protection scope of the application.

Claims

1. A method for the production of a self-powered yarn, characterized in that, The method comprises the following steps: S1, preparing a PDMS solution: uniformly mixing a main agent of polydimethylsiloxane (PDMS) and an auxiliary agent according to a predetermined ratio to obtain the PDMS solution; S2, preparing a conductive core yarn A: using a double-stranded copper-plated silver wire as a core yarn and the PDMS solution as a sheath material to prepare the conductive core yarn A by means of a coaxial wet spinning technology; S3, preparing a coated fiber B: adding appropriate amounts of potassium hydroxide, nano-zinc oxide powder and gas-phase nano-aluminum oxide powder into water, performing ultrasonic treatment and then fully stirring to form a uniform aluminum oxide nanofluid electrolyte; immersing a polyester filament in the electrolyte and performing drying treatment to obtain the coated fiber B coated with the aluminum oxide nanofluid electrolyte; S4, preparing a composite fiber C: uniformly coating the coated fiber B obtained in step S3 on the conductive core yarn A prepared in step S2 by means of a ring spinning process to form the composite fiber C; S5, preparing a self-powered yarn: wrapping the conductive core yarn A prepared in step S2 on the composite fiber C obtained in step S4 as a new core yarn; and then using the PDMS solution prepared in step S1 as a sheath material to prepare the self-powered yarn by means of a coaxial wet spinning technology.

2. A method of making a self-powered yarn as claimed in claim 1, characterized in that, In step S1, the auxiliary agent is a PDMS curing agent, and the ratio of the main agent of PDMS to the auxiliary agent is 10:

1.

3. A method of making a self-powered yarn according to claim 2, wherein, In step S1, the specific operation of the mixing treatment is as follows: placing the mixed solution of the main agent of PDMS and the auxiliary agent in a container under normal temperature conditions and stirring vigorously for 30 minutes. After mixing, the solution is placed in a vacuum oven for defoaming treatment for 20 minutes to obtain the PDMS solution.

4. A method of making a self-powered yarn as claimed in claim 1, wherein, In steps S2 and S5, when the coaxial wet spinning is performed, an oil bath at 130 DEG C is used as a coagulating bath.

5. A method of making a self-powered yarn as in claim 1, wherein the step of In step S3, the configuration of the aluminum oxide nanofluid electrolyte is as follows: the content of potassium hydroxide is 30wt%, the content of nano-zinc oxide powder is 3wt% to 5wt%, and the content of gas-phase nano-aluminum oxide powder is 1wt% to 4wt%.

6. A method of making a self-powered yarn according to claim 5, wherein, In step S3, the ultrasonic treatment time is 30 minutes, and the stirring time is 2 hours.

7. The method for preparing a self-powered yarn as described in claim 6, characterized in that, in In step S3, the polyester filament is completely immersed in the prepared aluminum oxide nanofluid electrolyte for 10 minutes, and then the immersed polyester filament is placed in a normal temperature environment for drying.

8. A method of making a self-powered yarn as in claim 1, wherein, In step S4, the specific operation of the ring spinning process is as follows: winding the conductive core yarn A and the coated fiber B on two yarn tubes of a ring spinning frame respectively to ensure that the yarn tension is uniform and stable; taking the conductive core yarn A as a core yarn and the coated fiber B as an outer covering yarn to perform a twisting operation by means of the ring spinning frame.

9. A method of making a self-powered yarn as in claim 1, wherein, In step S5, the conductive core yarn A is wrapped on the composite fiber C at an included angle of 60 DEG.

10. A self-powered yarn, characterized by, The self-powered yarn is prepared by using the preparation method of any one of claims 1 to 9.

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