CN109468722B - A kind of multifunctional biomechanical energy harvesting textile and its preparation method and application - Google Patents

Abstract

The invention relates to a multifunctional biomechanical energy harvesting textile and its preparation method and application. The method comprises: preparing multi-stage helical yarns by plying and twisting, inserting conductive yarns into a rubber tube, stretching the rubber tube to prepare triboelectric yarns, using the multi-stage helical yarns as warp yarns and the triboelectric yarns as weft yarns , fabricating energy harvesting textiles by plain weave. The energy harvesting textile has good stretchability and hydrophobicity, and it can power electronic devices, and can also be used as energy sources and sensors for self-powered wireless monitoring systems.

Description

A kind of multifunctional biomechanical energy harvesting textile and its preparation method and application

technical field

The invention belongs to the field of wearable energy and its preparation and application, in particular to a multifunctional biomechanical energy harvesting textile and a preparation method and application thereof.

Background technique

The rapid development of wearable electronic products is causing changes in human social life, and people's demand for wearable energy is increasing. However, traditional rechargeable batteries are difficult to meet the requirements of wearable electronic devices in terms of lightweight, flexibility, and integration due to their limited capacity, poor flexibility, poor stretchability, and poor biocompatibility. Therefore, the development of sustainable and self-powered systems is very important for wearable electronic devices. Biomechanical energy is one of the most common and abundant mechanical energy that humans can generate every day. Harvesting wasted biomechanical energy from human motion can help solve the energy needs of wearable electronic devices.

One of the ultimate goals of wearable electronics is to integrate with textiles and clothing to give electronic devices the benefits of fabrics, such as softness, breathability, comfort, safety, and sustainability. The emergence of triboelectric nanopower technology provides a highly feasible and cost-effective method to realize the integration of wearable electronics and fabrics. However, the output performance of existing triboelectric devices for harvesting biomechanical energy still needs to be improved, such as triboelectric nano-electricity textiles using polyimide and copper as friction materials (Adv. Mater. 2016, 28, 10267–10274 ) and hybrid nanogenerators utilizing different mechanical energies (ACS Nano 2014, 8, 10674–10681). For sustainable and self-powered applications, large-area wearable energy harvesting devices must be developed to extract energy from human motion.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a multifunctional biomechanical energy harvesting textile and its preparation method and application, so as to overcome the deficiency of the lack of triboelectric devices for harvesting biomechanical energy in the prior art.

A preparation method of a multifunctional biomechanical energy harvesting textile of the present invention comprises:

(1) plying and twisting the modified polyacrylonitrile yarn and conductive yarn to obtain a primary helical yarn, and then plying and twisting two primary helical yarns to obtain a multi-stage helical yarn;

(2) Insert the conductive yarn into the rubber tube, stretch the rubber tube, and use the friction force between the rubber tube and the conductive yarn and the compressive force at both ends of the rubber tube to make the conductive yarn present a serpentine structure in the rubber tube, and then Seal both ends of the rubber tube to obtain triboelectric yarn;

(3) Using the multi-stage helical yarns in step (1) as warp yarns and the triboelectric yarns in step (2) as weft yarns, plain weave is performed to obtain multifunctional biomechanical energy harvesting textiles.

The modified polyacrylonitrile yarn in the step (1) has lower surface energy and better hydrophobicity.

In the step (1), the twist of the primary helical yarn is 400-800 twists/m; the twist of the multi-stage helical yarn is 300-600 twists/m.

In the step (1), the two twisting directions are opposite.

In the step (2), two-component epoxy resin glue is used to seal both ends of the rubber tube.

In the step (2), the conductive yarn is used as the friction positive electrode material and the electrode material, the rubber tube is used as the friction negative electrode material and the hydrophobic material, and the serpentine structure makes the triboelectric yarn have excellent tensile properties.

In the step (3), plain weave is as follows: using a knitting machine for plain weave, first, adjust the position of the heald frame, and set parameters on the writing board screen; The thread is fixed at the rear of the heald frame; finally, triboelectric yarns are intertwined on the multi-stage helical yarns, and the tension of the warp and weft yarns is adjusted by the back beam during the weaving process.

The working air pressure of the braiding machine is 0.4-0.6MPa, and the picking amount per minute is 50-70 times.

In the step (3), the buckling wave height of the triboelectric yarn is equal to zero, and the buckling wave height of the multistage helical yarn is equal to the sum of the diameters of the triboelectric yarn and the multistage helical yarn.

In the step (3), the multifunctional biomechanical energy harvesting textiles can generate electricity in two ways, one is to use the contact separation of the warp and the weft to generate electricity, and the other is to use the conductive yarn inside the triboelectric yarn and the rubber tube to generate electricity. Contact separation to generate electricity.

In the step (3), the multifunctional biomechanical energy harvesting textile has two working modes: stretching and compression, and each working mode includes the following four circuit connection modes: warp-connected single-electrode mode, weft-connected single-electrode mode, warp-weft connection mode Connect the single-electrode mode and the two-electrode mode.

The present invention provides a multifunctional biomechanical energy harvesting textile prepared by the above method.

The present invention also provides an application of the multifunctional biomechanical energy harvesting textiles prepared by the above method. For example, to power electronic devices, or as energy sources and sensors for self-powered wireless monitoring systems.

The invention relies on textile equipment to continuously weave multi-stage helical yarns and triboelectric yarns, and realizes the integrated design of textiles and energy devices.

beneficial effect

(1) the manufacturing process of the present invention is simple, and the materials used are commercial raw materials that are cheap and easy to obtain;

(2) The energy harvesting textiles prepared by the present invention have excellent tensile properties and can meet the large deformation of the human body;

(3) The energy harvesting textiles prepared by the present invention have excellent hydrophobic properties;

(4) The energy harvesting textiles prepared by the present invention can supply power for electronic devices, and can also be used as energy sources and sensors for self-powered wireless monitoring systems.

Description of drawings

Fig. 1 is the preparation flow chart of the energy harvesting textile of the present invention;

Fig. 2 is the water contact angle photo of rubber tube in embodiment 1;

Figure 3 is an optical photo (a) and a water contact angle photo (b) of the modified polyacrylonitrile yarn in Example 1;

Figure 4 is a photograph of the energy harvesting textile in Example 1 before and after stretching;

Figure 5 shows two working modes (i-iii) and four circuit connection modes (a-d) of the energy harvesting textile in Example 1;

FIG. 6 is a schematic diagram of the operation mechanism of the energy harvesting textile during stretching in the warp and weft connection single-electrode mode in Example 1;

7 is a photo of the energy harvesting textiles supplying power to an electronic watch in Example 1;

8 is a schematic diagram of the energy harvesting textile used in the wireless monitoring system in Example 1;

FIG. 9 is the output voltage of the energy harvesting textile during stretching in the warp and weft connection single-electrode mode in Example 1;

FIG. 10 is the output voltage of the energy harvesting textile during stretching in the warp and weft connection single electrode mode in Example 2;

11 is the output voltage of the energy harvesting textile during stretching in the warp and weft connection single electrode mode in Example 3. 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

(1) Plying and twisting the fluorosilane graft-modified polyacrylonitrile yarn and conductive yarn to obtain a primary helical yarn of 800 twists/m, and then plying and twisting the two primary helical yarns to obtain 600 twists /m of multi-stage helical yarn, the two twists are in opposite directions.

(2) Insert the conductive yarn into the rubber tube, stretch the rubber tube, and use the friction force between the rubber tube and the conductive yarn and the compressive force at both ends of the rubber tube to make the conductive yarn present a serpentine structure in the rubber tube, and then Two-component epoxy resin glue was used to seal both ends of the rubber tube to obtain triboelectric yarns.

(3) Using the multi-stage helical yarn as the warp yarn in the step (1) and the triboelectric yarn as the weft yarn in the step (2), a knitting machine is used to perform plain weave weaving. First, adjust the position of the heald frame, and set the parameters on the writing board screen, the working air pressure is set to 0.6MPa, and the picking amount per minute is set to 70 times; It is fixed at the rear of the heald frame; finally, triboelectric yarns are intertwined on the multi-stage helical yarns, and the tension of the warp and weft yarns is adjusted by the back beam during the weaving process, resulting in energy harvesting textiles.

Figure 2 shows that the rubber tube has good hydrophobicity.

Figure 3 shows that the modified polyacrylonitrile yarn has good hydrophobicity.

Figure 4 shows that the energy harvesting textiles have good tensile properties.

Figure 6 shows that in the initial state, the friction layers are in good contact, and electrons are transferred from the friction positive electrode material to the surface of the friction negative electrode material; in the tensile state, the friction layers begin to separate, and positive charge traps are generated on the electrodes, and electrons flow from the ground to the electrodes through the external circuit; In the retracted state, the friction layer contacts again, and the excess electrons on the electrodes flow back to the ground.

Figure 8 shows that the energy-harvesting textile acts both as an energy source to charge lithium batteries and as a sensor to monitor human movement.

Figure 9 shows that when the twist of the multi-stage helical yarn is larger, the yarns are tightly bound and the output performance of the energy harvesting textile is higher.

Example 2

In step (1) of Example 1, "obtain a primary helical yarn of 800 twists/m" to "obtain a primary helical yarn of 600 twists/m", and "obtain a multistage helical yarn of 600 twists/m" to In order to "obtain a multi-stage helical yarn of 450 twists/m", in step (2), change "the working air pressure is set to 0.6MPa, and the picking amount per minute is set to 70 times" to "the working air pressure is set to 0.5MPa, and each The picking amount per minute was set to 60", and the rest were the same as in Example 1 to obtain an energy harvesting textile.

Figure 10 shows that the twist of the multi-stage helical yarn decreases and the output performance of the energy harvesting textile decreases.

Example 3

In step (1) of Example 1, "to obtain a primary helical yarn of 800 twists/m" was changed to "to obtain a primary helical yarn of 400 twists/m, and "to obtain a multi-stage helical yarn of 600 twists/m" was changed to "To obtain a multi-stage helical yarn of 300 twists/m", in step (2), "the working air pressure is set to 0.6 MPa, and the picking amount per minute is set to 70 times" to "the working air pressure is set to 0.4 MPa, and the per minute The picking amount was set to 50 times, and the rest were the same as in Example 1 to obtain energy harvesting textiles.

Figure 11 shows that as the twist of the multi-stage helical yarn decreases, the yarn bond becomes loose and the output performance of the energy harvesting textile decreases.

Comparative Example 1

Researchers from Peking University deposited copper and polyimide on polyester yarns to obtain friction positive electrode materials and friction negative electrode materials. The friction positive electrode material was used as the warp yarn, and the friction negative electrode material was used as the weft yarn, and the friction nano-power generation textiles (Adv.Mater .2016, 28, 10267–10274). Due to the small separation distance of the triboelectric nano-electricity textile and the loose bonding of the yarns, its maximum output voltage is only 5 volts, which is far less than the output voltage of the energy harvesting textile of the present invention, which is close to 20 volts. In addition, compared with the present invention, the triboelectric nano-electricity textile has poor tensile properties and is almost difficult to stretch.

Claims (9)

1. A method of making a multifunctional biomechanical energy harvesting textile comprising:

(1) the modified polyacrylonitrile yarn and the conductive yarn are plied and twisted to obtain primary spiral yarn, and then the two primary spiral yarns are plied and twisted to obtain multi-stage spiral yarn;

(2) inserting the conductive yarn into the rubber tube, stretching the rubber tube to enable the conductive yarn to be in a snake-shaped structure in the rubber tube, and then sealing two ends of the rubber tube to obtain the triboelectric yarn;

(3) and (3) taking the multi-stage spiral yarns in the step (1) as warp yarns and the triboelectric yarns in the step (2) as weft yarns, and performing plain weaving to obtain the multifunctional biomechanical energy collection textile.

2. The method as claimed in claim 1, wherein the primary helical yarn in step (1) has a twist of 400-800 twists/m; the twist of the multi-stage spiral yarn is 300-.

3. The method according to claim 1, wherein the two twists in step (1) are in opposite directions.

4. The method of claim 1, wherein the step (2) of sealing the two ends of the rubber tube uses two-component epoxy glue.

5. The method according to claim 1, wherein the plain weave in step (3) is: a braiding machine is adopted for plain weaving, firstly, the position of a heald frame is adjusted, and parameters are set on a screen of a writing board; then, fixing the warped multistage spiral yarns at the rear part of the heald frame by using a yarn guide rod; finally, a triboelectric yarn is interwoven over the multi-stage spiral yarn, and the tension of the warp and weft yarns is adjusted by the back beam during the weaving process.

6. Method according to claim 5, characterised in that the working air pressure at the weaving machine is 0.4-0.6MPa and the picking is 50-70 times per minute.

7. The method of claim 1, wherein the buckling wave height of the triboelectric yarn in step (3) is equal to zero, and the buckling wave height of the multi-stage spiral yarn is equal to the sum of the diameters of the triboelectric yarn and the multi-stage spiral yarn.

8. A multifunctional biomechanical energy harvesting textile made according to the method of claim 1.

9. Use of a multifunctional biomechanical energy harvesting textile prepared according to the method of claim 1.

Images