CN111519300A - A kind of elastic triboelectric nanometer power generation yarn and preparation method thereof - Google Patents

Abstract

The invention relates to elastic friction nanometer electricity generation yarn and a preparation method thereof. The method comprises the following steps: respectively carrying out conjugated electrostatic spinning on polymers with different electronegativities, taking an elastic conductive fiber electrode as a receiving stage to obtain elastic conductive fibers coating polymer nano fibers with different electronegativities, and then interweaving and assembling. The method is simple, can be used for large-scale continuous preparation, and has wide material selection range and light weight; the surface of the elastic friction nano power generation yarn prepared is of a nano fiber structure, the specific surface area of the elastic friction nano power generation yarn is larger, and the multi-stage micro-nano structure is beneficial to improving the contact area of the friction surface, so that the output power of a device is effectively improved.

Description

A kind of elastic triboelectric nanometer power generation yarn and preparation method thereof

technical field

The invention belongs to the field of triboelectric power generation yarn and its preparation, in particular to an elastic friction nanometer power generation yarn and a preparation method thereof.

Background technique

At present, under the situation of rapid development of wearable devices, how to make them independent, durable, and maintenance-free continuous operation for a long time has put forward a very urgent demand for energy technology. Generally speaking, the power source of these tiny electronic devices comes directly or indirectly from the battery. Batteries are not only large and heavy, but also contain toxic chemicals that are potentially harmful to the environment and the human body, and cannot meet wearable requirements.

In recent years, people have been dreaming of realizing a power technology that can be woven into clothes, and can wear this energy on the body, so as to convert the energy of people's own movement into electricity to drive the electronic devices to work without interruption. Triboelectric nanogenerators are a kind of technology based on the combination of triboelectric effect and electrostatic induction, which can convert mechanical energy into electrical energy. Triboelectric nanogenerators are constructed with elastic yarns, which can be easily mixed with ordinary yarns. It is further designed into clothing to build a wearable "energy clothing" that converts the mechanical energy of human movement into electrical energy and provides supplementary energy for wearable electronic devices.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an elastic triboelectric nano-generating yarn and a preparation method thereof, so as to fill in the blank of the prior art.

The invention provides an elastic triboelectric nanometer power generation yarn, which is obtained by interlacing elastic conductive fibers covering polymer nanofibers with different electronegativity.

The polymers include polyvinyl alcohol PVA, polyurethane PU, polyvinylidene fluoride PVDF, polyacrylonitrile PAN, polylactic acid PLA, polycaprolactone PCL, polyimide PI, polyamide PA, polyvinyl chloride PVC, poly One of styrene PS, polymethyl methacrylate PMMA, polypyrrolidone PVP, polyhydroxybutyrate valerate PHBV.

The elastic conductive fiber is one of the multi-strand spandex as the central axis, the surface of which is plated with metal nylon fibers; carbon nanotubes covered with polyurethane fibers; and graphene covered with polyurethane fibers.

The present invention also provides a preparation method of elastic triboelectric nano-power-generating yarn, comprising:

(1) Conjugate electrospinning of polymers with different electronegativity respectively, take the elastic conductive fiber electrode as the receiving stage, and coat the polymer nanofibers on the surface of the elastic conductive fiber electrode to obtain the coating of different electronegativity. Elastic conductive fibers of polymer nanofibers (polymer nanofiber friction layer);

(2) interweaving and assembling the elastic conductive fibers coated with polymer nanofibers of different electronegativity in step (1) to obtain elastic triboelectric nano-power-generating yarns.

The process parameters of the conjugated electrospinning in the step (1) are a positive voltage of 8 to 15 kV, a negative voltage of -8 to -15 kV, a receiving distance of 5 to 15 cm, a propulsion rate of 0.2 to 2 ml/h, and a rotational speed of the winding rollers of 300 to 500 rpm, The rotational speed of the receiving roller is 0.2-0.4 rpm.

In the step (2), the number of interwoven fibers is greater than or equal to 2; the number of interwoven spiral turns is greater than or equal to 1.

The invention also provides an application of the elastic triboelectric nanometer power generation yarn.

beneficial effect

(1) The present invention is simple, can be prepared continuously on a large scale, has a wide selection of materials and is light in weight;

(2) The surface of the elastic triboelectric nano-generating yarn prepared by the present invention is a nanofiber structure, and its super large specific surface area and multi-level micro-nano structure are beneficial to increase the contact area of the friction surface, thereby effectively improving the output power of the device; The fiber structure is conducive to its blending with ordinary fibers. It has good wearing performance and can be completely combined with clothing. It is very suitable for collecting mechanical energy generated by human movements such as walking, running, etc. and converting it into electrical energy. It can not only be used for small electronic equipment. Power supply can also be used to build self-driven sensors for human motion pattern recognition and other purposes.

Description of drawings

FIG. 1 is a schematic diagram of the structure of the elastic triboelectric nano-generating yarn prepared in Example 1. FIG.

Figure 2 is a SEM image of the surface of the elastic friction nano-power generation fiber prepared in Example 1, wherein a is the PVDF elastic friction nano-power generation fiber, and b is the PHBV elastic friction nano-power generation fiber.

3 is a cross-sectional SEM image of the elastic friction nano-power generation fiber prepared in Example 1, wherein a is the PVDF elastic friction nano-power generation fiber, and b is the elastic friction nano-power generation fiber.

FIG. 4 is a graph of the output voltage and output current of the elastic triboelectric nano-power-generating yarn prepared in Example 2. FIG.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

The elastic conductive fiber electrode made of multi-strand spandex as the central axis and several silver-coated nylon fibers spirally wound on the spandex is the receiving grade. It is produced by Qingdao Tianyin Textile Co., Ltd. with a specification of 600D. The concentration of PVDF spinning solution is 10%, PVDF is produced by Shanghai Sanaifu New Materials Co., Ltd., the specification is FR904; the concentration is 8% PHBV spinning solution, PHBV is produced by Zhejiang Tianan Biomaterials Co., Ltd., the specification is Y1000P, PVDF and PHBV were respectively coated on PVDF and PHBV by a conjugate electrospinning method with process parameters as positive voltage 9kV, negative voltage -9kV, receiving distance 8cm, advancing rate 1.2ml/h, rotating speed of winding roll 300rpm, and rotating speed of receiving roll 0.3rpm. On the surface of the elastic conductive fiber electrode, select 2 elastic conductive fibers covered with PVDF nanofibers prepared above and 2 elastic conductive fibers covered with PHBV nanofibers, interweave for 3 laps, and assemble to form elastic friction nanometer power generation yarns. The stretch ratio was 100%, and the output voltage was about 8V and the output current was about 75nA under the conditions of the stretching frequency of 2Hz.

Figure 1 is a schematic diagram of the structure, in the figure: 1, elastic conductive fiber electrode, 2, PVDF nanofiber, 3, PHBV nanofiber.

Figure 2 is the SEM image of the surface of the prepared elastic triboelectric nanofibers, which shows that the electrospun nanofibers have obvious and twisted structures on the surface of the elastic triboelectric fibers, and the nanofibers are closely arranged in a specific direction.

Figure 3 is a cross-sectional SEM image of the prepared elastic friction nano-power generation fiber, which shows that the diameter of the PVDF elastic friction nano-power generation fiber and the PHBV elastic friction nano-power generation fiber is about 0.5mm-0.8mm, and the thickness of the nanofiber friction layer is about 0.1mm ~0.2mm.

Example 2

The elastic conductive fiber electrode made of multi-strand spandex as the central axis and several silver-coated nylon fibers spirally wound on the spandex is the receiving grade. It is produced by Qingdao Tianyin Textile Co., Ltd. with a specification of 600D. The concentration of PVDF spinning solution is 10%, PVDF is produced by Shanghai Sanaifu New Materials Co., Ltd., the specification is FR904; the concentration is 8% PHBV spinning solution, PHBV is produced by Zhejiang Tianan Biomaterials Co., Ltd., the specification is Y1000P, PVDF and PHBV were respectively coated on PVDF and PHBV by a conjugate electrospinning method with process parameters as positive voltage 9kV, negative voltage -9kV, receiving distance 8cm, advancing rate 1.2ml/h, rotating speed of winding roll 300rpm, and rotating speed of receiving roll 0.3rpm. On the surface of the elastic conductive fiber electrode, select 1 elastic conductive fiber coated with PVDF nanofibers prepared above and 1 elastic conductive fiber electrode coated with PHBV nanofibers, interweave for 3 circles, and assemble to form elastic friction nanometer power generation yarn.

Figure 4 is the output voltage and current diagram of the prepared elastic triboelectric nano-power yarn; it can be seen that the output voltage is about 1.7V and the output current is about 15nA under the conditions of a stretching ratio of 100% and a stretching frequency of 2Hz.

Example 3

With multi-strand spandex as the central axis, a number of silver-plated nylon fibers are spirally wound on the spandex elastic conductive fiber electrode as the receiving level, produced by Qingdao Tianyin Textile Co., Ltd., the specification is 600D, and the concentration is 10% PVDF spinning Silk dope, PVDF is produced by Shanghai Sanaifu New Materials Co., Ltd., the specification is FR904; the concentration is 8% PLA spinning dope, PLA is provided by Sigma-Aldrich, molecular weight _Mw = 9000, the process parameters are positive voltage 9kV, negative Voltage -9kV, receiving distance 8cm, propulsion rate 1.2ml/h, winding roller speed 300rpm, receiving roller speed 0.3rpm conjugate electrospinning method, respectively wrap PVDF and PLA on the surface of elastic conductive fiber electrodes, select one The above-prepared elastic conductive fibers covered by PVDF nanofibers and one elastic conductive fiber electrode covered by PLA nanofibers were interwoven for 6 laps, and assembled to form elastic triboelectric nano-power generation yarns. The output voltage obtained under the condition of 2Hz is about 1.2V, and the output current is about 10nA.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form or substance. It should be pointed out that for those skilled in the art, without departing from the method of the present invention, the Several improvements and supplements can be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. All those skilled in the art, without departing from the spirit and scope of the present invention, can utilize the above-disclosed technical content to make some changes, modifications and equivalent changes of evolution, all belong to the present invention. Equivalent embodiments; at the same time, any modification, modification and evolution of any equivalent changes made to the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (7)

1. An elastic triboelectric nano-power-generating yarn, characterized in that, the elastic conductive fibers that coat the polymer nanofibers of different electronegativity are interwoven to obtain. 2. The yarn according to claim 1, wherein the polymer comprises polyvinyl alcohol PVA, polyurethane PU, polyvinylidene fluoride PVDF, polyacrylonitrile PAN, polylactic acid PLA, polycaprolactone PCL, One of imide PI, polyamide PA, polyvinyl chloride PVC, polystyrene PS, polymethyl methacrylate PMMA, polypyrrolidone PVP, polyhydroxybutyrate valerate PHBV. 3. The yarn according to claim 1, characterized in that, the elastic conductive fiber is a multi-strand spandex as the central axis, and the surface is metal-plated nylon fiber; carbon nanotubes cover polyurethane fiber; graphene covers the polyurethane fiber. a kind of. 4. a preparation method of elastic triboelectric nano-generating yarn, comprising: (1) Conjugate electrospinning of polymers with different electronegativities respectively, and use elastic conductive fiber electrodes as the receiving stage to obtain elastic conductive fibers coated with polymer nanofibers of different electronegativities; (2) interweaving and assembling the elastic conductive fibers coated with polymer nanofibers of different electronegativity in step (1) to obtain elastic triboelectric nano-power-generating yarns. 5. The method according to claim 4, wherein the process parameters of the conjugated electrospinning in the step (1) are: positive voltage 8～15kV, negative voltage -8～-15kV, receiving distance 5～15cm, The rotation speed of the winding roller is 300-500 rpm, the rotation speed of the receiving rotating disk is 0.2-0.4 rpm, and the advancing rate is 0.2-2 ml/h. 6 . The method according to claim 4 , wherein in the step (2), the number of interwoven fibers is greater than or equal to 2; the number of interwoven spiral turns is greater than or equal to 1. 7 . 7. A use of the yarn of claim 1.

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