CN114836876B

CN114836876B - Preparation method of velvet-shaped woven belt for night indication capable of generating power

Info

Publication number: CN114836876B
Application number: CN202210766187.0A
Authority: CN
Inventors: 范红卫; 张建光; 魏存宏; 沈建根; 杨勇; 寇婉婷; 张烨; 王雪
Original assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Current assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-10-04
Anticipated expiration: 2042-07-01
Also published as: CN114836876A

Abstract

The invention relates to a velvet-shaped woven belt for night indication capable of generating electricity and a preparation method thereof, wherein nylon multifilament is used as ground warp, piezoelectric monofilament is used as hair warp, the warp, nylon weft and conductive weft are woven into the woven belt with hair loops according to towel tissues, then the piezoelectric monofilament is cut into piezoelectric short velvet, the piezoelectric short velvet is protruded out of the surface of the woven belt through indentation treatment, and the conductive weft and LED lamp beads are connected to obtain the woven belt; the piezoelectric monofilament is integrally rectangular and comprises an elastic cladding II, a piezoelectric film II and conductive yarns II; the piezoelectric film II is fixed in the elastic cladding II and has a wave-shaped section; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, and is in contact with the wave trough region of the piezoelectric film II and partially exposed out of the elastic cladding II, and the conductive yarn II is distributed on the upper surface and the lower surface of the piezoelectric film II; the area of the piezoelectric monofilament exposed out of the conductive yarn II is contacted with the conductive weft yarn; the method is simple, and the prepared product can generate voltage through the deformation of the piezoelectric flock.

Description

Preparation method of velvet-shaped woven belt for night indication capable of generating power

Technical Field

The invention belongs to the technical field of spinning, and relates to a preparation method of a velvet-shaped woven belt for night indication, which can generate electricity.

Background

The utilization of energy sources in nature, such as solar energy, thermal energy, mechanical energy, wind energy, tidal energy, and the like, to obtain electric energy has become an important research direction in the field of energy sources. The intelligent material is applied to the wearable field, the same attraction is brought to the attention of more and more researchers, in the intelligent wearable field, how to obtain electric energy without a power supply becomes indispensable content, the wearable device without the power supply allows a user not to weaken the use experience due to power consumption, and the wearable device is particularly embodied in military use, field use and numerous occasions where the power supply cannot be used. The piezoelectric material as a material capable of converting mechanical energy into electric energy is undoubtedly an indispensable component in the field of intelligent wearable, and the research on effectively and reasonably combining the piezoelectric material on the fabric is a direction worth intensive research. Piezoelectric material is a material that develops a voltage across two terminals when subjected to a compressive force. At present, the piezoelectric material can be used as a large-modulus inorganic substance, and can also be a relatively low-modulus polymer, and in consideration of the excellent piezoelectric performance of the piezoelectric solid material and the flexibility and processability of the polymer, the piezoelectric ceramic particles with a micro-nano scale are compounded in the polymer, so that the excellent piezoelectric performance of the piezoelectric ceramic and the processability of the polymer can be achieved. In addition, the polymer can be processed into fiber under certain conditions for weaving.

As is well known, woven fabrics are widely used in various aspects of life, including clothing-like woven fabrics, industrial woven fabrics, and decorative woven fabrics, while tape woven fabrics are strip-like textile materials having a small width, and at present, tapes for indication, isolation, and warning of a fabric base are widely paid attention due to their flexibility and portability. In the daytime, because of sufficient light, various kinds of band-shaped fabrics are easily perceived by human eyes, and can play a good role in prompting, and when the fabric is in the nighttime, the functional fabric belt for people to acquire information by means of light emission cannot play the role well, and the fabric belt needs to emit light, a light-emitting element is usually required to be added into the fabric belt, and meanwhile, a power supply device is required to be arranged, so that the fabric belt without a power supply cannot provide energy for the light-emitting element at night. The light reflection type can be adopted for some occasions with external light sources so as to be perceived by naked eyes, however, the area with insufficient illumination often cannot provide clear enough information so that people can make correct and effective judgment. The addition of a power supply to such a webbing not only adds cost, but also significantly reduces its flexibility and portability.

Therefore, the development of the woven belt which integrates excellent piezoelectric performance, high flexibility and convenient processing, particularly can actively emit light at night to play a role in warning or indicating, has practical and feasible application occasions and has important significance.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a method for preparing a velvet-shaped woven belt for indicating night, which can generate electricity.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for preparing a velvet-shaped woven belt for night indication capable of generating power comprises the steps of weaving ground warps, hair warps, nylon weft yarns and conductive weft yarns according to towel tissues by using nylon multifilaments as ground warps and piezoelectric monofilaments as hair warps and adopting a weaving process to obtain the woven belt with the hair loops, then carrying out cutting treatment and indentation treatment on the piezoelectric monofilaments (the cutting treatment and the indentation treatment can be carried out at first, or the indentation treatment and the cutting treatment can be carried out at first) and connecting the conductive weft yarns with LED lamp beads to obtain the velvet-shaped woven belt for night indication capable of generating power;

the conductive weft yarns in the woven belt with the terry are in multiple pairs, the same pair of conductive weft yarns is adjacent to each other along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by one or more nylon weft yarns; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile warp penetrates out of two conductive weft yarns of the same pair; connecting the conductive weft yarns with the LED lamp beads, namely connecting two conductive weft yarns of the same pair with two poles of the LED lamp beads respectively;

the piezoelectric monofilament is integrally in a rectangular belt-shaped structure and comprises an elastic cladding II, a piezoelectric film II and a conductive yarn II with a circular cross section; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axes of the conductive yarns II are parallel to the length direction of the piezoelectric monofilaments, the conductive yarns II are in contact with the cambered surface regions of the wave troughs of the piezoelectric film II and expose a part of the conductive yarns II from the elastic cladding II, the number of the conductive yarns II is multiple and divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

As a preferred technical scheme:

in the method for manufacturing the velvet-shaped woven belt for indicating night, which can generate electricity, the volume of the exposed part of the conductive yarn II from the elastic cladding II is 10-30% of the volume of the conductive yarn II.

The preparation method of the velvet-shaped woven belt for indicating night, which can generate electricity, comprises the following steps of:

(1) Preparing a pre-drawing body;

the pre-drafting body is integrally in a rectangular block structure and comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the piezoelectric film I is of a wavy strip-shaped structure, and the undulation direction of the piezoelectric film I is parallel to the width direction of the pre-drafting body, namely the left and right directions of the pre-drafting body; the central axis of the pipeline is parallel to the length direction of the pre-drafting body, namely parallel to the front and back directions of the pre-drafting body, the pipeline is contacted with the cambered surface area of the wave trough of the piezoelectric film I, the number of the pipelines is multiple and divided into two groups, one group is positioned above the piezoelectric film I and arranged at intervals, and the other group is positioned below the piezoelectric film I and arranged at intervals; the conductive yarn I penetrates through each pipeline, the diameter of the conductive yarn I before penetrating into the pipeline is larger than the inner diameter of the pipeline, one end of the conductive yarn I is compressed and connected with one end of a traction rope, and the other end of the traction rope penetrates out of the pipeline and then is pulled to realize the penetration of the conductive yarn I into the pipeline;

(2) Drafting;

and (2) placing the pre-drafting body in hot drafting equipment for drafting, wherein the drafting direction is parallel to the pipeline in the pre-drafting body, the elastic cladding I, the piezoelectric film I and the conductive yarn I are deformed in the drafting process, the pipeline is not deformed, and the position of the pipeline is kept unchanged from beginning to end.

The preparation method of the velvet-shaped woven belt for night indication capable of generating electricity comprises the following steps that in the step (1), the length of the pre-drafting body is 60-80 cm, the width is 8.0-12.0 cm, and the height is 5.0-7.0 cm;

the pre-drafting body and the piezoelectric film I both have vertically symmetrical structures, the symmetrical surfaces of the pre-drafting body and the piezoelectric film I are superposed, the maximum thickness of the piezoelectric film I is 50% -80% of the height of the pre-drafting body, the minimum thickness of the piezoelectric film I is 30% -50% of the height of the pre-drafting body, the distance between the left end or the right end of the piezoelectric film I and the length and height surface of the pre-drafting body is 10% -20% of the width of the pre-drafting body, the distance between the front end or the rear end of the piezoelectric film I and the width and height surface of the pre-drafting body is 0, the length and height surface of the pre-drafting body is the common surface of the long edge and the high edge of the pre-drafting body, and the width and the high surface of the pre-drafting body is the common surface of the wide edge and the high edge of the pre-drafting body; the number of wave troughs on the piezoelectric film I is equal to that of the pipelines;

the inner diameter of the pipeline is 30-80% of the diameter of the conductive yarn I before penetrating into the pipeline, the outer diameter of the pipeline is 20% larger than the inner diameter, and the number of the pipelines is 8-20;

in the step (2), the draft multiple is 5 to 25.

The method for preparing the velvet-shaped woven belt for indicating night and capable of generating power comprises the following steps of: firstly, laying a layer of elastomer slices at the bottom of a cubic container, then continuously laying a plurality of pipelines with central shafts parallel to the Y direction and arranged at intervals along the X direction, then continuously laying a piezoelectric film I with a wave-shaped belt-shaped structure and wave fluctuation directions parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of the wave trough on the lower surface of the piezoelectric film I, then continuously laying a plurality of pipelines with central shafts parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of the wave trough on the upper surface of the piezoelectric film I, and finally continuously laying a layer of elastomer slices to completely cover the pipelines and then carrying out hot pressing to obtain a pre-drafting body; conductive yarns I are penetrated in each pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to a bottom edge of the container.

The method for preparing the velvet-shaped woven belt for indicating night, which can generate electricity, comprises the steps of preparing a conductive yarn I from a conductive material, wherein the conductive material is a polystyrene-ethylene-butadiene-styrene block copolymer, the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 12-40 mu m, and the average length of the copper fibers is 33-80 mm; the hot pressing temperature is 70-85 ℃, the hot pressing time is 20-30 min, and the hot pressing pressure is 500-1000N.

In the above method for manufacturing the velvet woven belt for indicating night time capable of generating electricity, the process of manufacturing the piezoelectric film I is as follows: firstly, preparing a mixture consisting of a piezoelectric polymer, piezoelectric ceramics and a solvent, then coating the mixture on a substrate to form a film, finally, carrying out hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and carrying out polarization treatment to obtain a piezoelectric film I.

The preparation method of the velvet-shaped woven belt for night indication capable of generating electricity comprises the following steps of preparing a piezoelectric polymer from polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polymethyl methacrylate, polyvinyl chloride, polystyrene or polyacetylene; the piezoelectric ceramic is barium titanate, lead zirconate titanate, lithium niobate, potassium sodium niobate or zinc oxide, and the average particle size of the piezoelectric ceramic is 200 +/-30 nm; the solvent is dimethylformamide.

The method for preparing the velvet-shaped night indication woven belt capable of generating electricity comprises the following steps of 1.

In the method for preparing the velvet-shaped woven belt for indicating night, which can generate electricity, the voltage is increased every 15min from 100V to 3500V by taking 100-200V as a step length during polarization treatment.

According to the preparation method of the velvet-shaped woven belt for night indication capable of generating electricity, the fineness of the nylon multifilament and the nylon weft yarn is 20-3000 denier, and the conductive weft yarn is silver-plated nylon staple yarn with the fineness of 150-1 inch.

The invention mechanism is as follows:

the existing flexible piezoelectric materials which can be used as terminals are generally film materials and fabric base materials. The membrane material can be directly formed into a membrane through a polymer or prepared into a fiber-based membrane through a spinning method, has a single structure, and has the defect of single application occasion when being directly used as a terminal product; the fabric-based piezoelectric material can weave piezoelectric fibers, which are generally woven in woven fabrics with basic tissues or complex tissues, or has the problem of insufficient weight of the material in unit area or the problem of difficult deformation of the piezoelectric material. The velvet structure woven belt capable of generating electricity is a flexible three-dimensional structure, the piezoelectric material is easy to deform, the woven belt is firstly woven into a towel structure, and then the top ends of pile loops formed by pile warps and the middles of the adjacent pile loops along the warp direction are cut off and formed. The prepared towel tissue woven belt is a woven fabric with two system warps of piezoelectric short fluff warp and nylon multifilament warp, partial sections of the fluff warp protrude along the thickness direction of the woven fabric, the other sections are interwoven with weft yarns and fixed in the woven fabric, and formed looped piles are easy to deform under external forces such as mechanical external force or vibration, so that the piezoelectric material can be easily deformed to generate electric energy when being used as the fluff warp of the woven fabric, and the final flexibility of the woven fabric is not influenced by an additional interweaving structure in the thickness direction of the woven fabric in the three-dimensional structure.

Specifically, in the invention, the elastic cladding II wrapped with the piezoelectric material is prepared into a pre-drafting body, part of the exposed and moderately compressed copper fiber spun yarn is embedded when the elastic cladding II is thermally stretched into the piezoelectric monofilament, and the copper fiber is not subjected to plastic deformation in the compression process, so that the copper fiber spun yarn expands to be in contact with the piezoelectric layer in a larger area in the finally stretched and formed monofilament, and electrons of the piezoelectric film I are easier to lead out. And because the copper fiber in the staple fiber yarn is formed by physical entanglement, the elastic cladding II generates rheology in the drafting process, so that part of the rheology flows into the pores in the yarn, and the copper fiber staple fiber yarn can be well combined with the copper fiber staple fiber yarn and is not easy to separate. Moreover, the contact area between the copper fiber spun yarn hairiness and the elastic cladding II is increased due to the existence of the copper fiber spun yarn hairiness, so that the excellent combination is ensured, and the high melting point of the copper fiber can not be influenced by the high temperature in the heat drafting process. Subsequently, the piezoelectric monofilament was polarized in 200V steps, and the voltage was increased every fifteen minutes from 100V up to 3500V.

When the piezoelectric material is deformed, voltage appears on two sides of the piezoelectric film I, and voltage is easily generated between the conductive weft yarns contacted with two sides of the piezoelectric monofilament. After the piezoelectric monofilaments are cut into the piezoelectric flock, the length of the piezoelectric flock section protruding out of the fabric is far longer than the length of the long side of the section of each piezoelectric monofilament, the piezoelectric flock section has an unstable form and is easy to deform greatly to generate large potential difference, and the piezoelectric flock section is different from a flaky piezoelectric layer. By means of the unstable form of the piezoelectric short velvet, energy widely existing in nature can cause deformation of the piezoelectric short velvet, for example, the piezoelectric short velvet under the action of wind can generate a swaying gesture to generate voltage, sound waves with high decibels can generate sound pressure to generate micro-nano vibration to generate voltage, the piezoelectric short velvet can vibrate to generate voltage due to non-uniform motion of an object connected with the woven belt, the piezoelectric short velvet can be connected with conductive weft yarns on two sides of the piezoelectric short velvet to enable the voltage to be output discontinuously, and LED lamp beads connected with the piezoelectric short velvet are lightened.

Moreover, the piezoelectric flock with the polymer encapsulated outside can effectively protect the piezoelectric film I with insufficient mechanical properties, so that the ribbon-shaped fabric can bear large external force and waterproof and moisture-proof properties.

Advantageous effects

(1) According to the velvet-shaped woven belt for night indication, which can generate electricity, voltage can be generated through the deformation of the piezoelectric short velvet, the voltage is output discontinuously, and the LED lamp beads at the edge of the woven belt are lightened, so that the woven belt is easier to perceive at night;

(2) According to the velvet-shaped woven belt for night indication capable of generating electricity, the piezoelectric flock is prepared through a hot drawing process, the piezoelectric layer is arranged in the middle, the conductive yarns are loaded on the two sides of the piezoelectric flock, and the polymer elastomer is integrally packaged to ensure the waterproof and moisture-proof performance;

(3) The velvet woven fabric for night indication capable of generating power can solve the problems that three-dimensional piezoelectric woven fabric is poor in flexibility and piezoelectric materials are not easy to deform or deform little in the prior art, and also solves the problems of large voltage output loss and instability caused by the contact problem of the conductive materials and the piezoelectric materials;

(4) According to the velvet-shaped woven belt for night indication capable of generating power, the weaving process is matched with the unstable physical properties of the partly embedded fabric and the partly exposed short velvet prepared by cutting the secondary wool warp, so that the short velvet with the high length-diameter ratio can sense weak vibration to cause potential change, self-power generation is integrated, especially electric energy conversion under weak stimulation, the preparation is convenient, the flexibility is realized, and the density is controllable.

Drawings

FIG. 1 is a schematic view of a power generating velvet night indicating woven tape operating unit;

FIG. 2 is an overall configuration of a velvet-like night indication woven belt capable of generating electricity;

FIG. 3 is a cross-sectional view of a piezoelectric monofilament;

FIG. 4 is a schematic view of a piezoelectric flock indentation process;

the nylon fabric comprises 1-nylon warp, 2-piezoelectric short velvet, 3-nylon weft, 4-conductive weft, 5-woven belt bottom layer, 6-elastic cladding II, 7-piezoelectric film II, 8-conductive yarn II, 9-rigid strip-shaped object.

Detailed Description

The present invention will be further described with reference to the following embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.

Example 1

A method for preparing a velvet-shaped woven belt for night indication capable of generating power comprises the following specific steps:

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

elastomer slicing: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, and the manufacturer is Takawasaki (Shanghai) industry Co., ltd., and the trademark is SEBS-6152;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 12 mu m, and the average length of the copper fibers is 80mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride-trifluoroethylene, barium titanate with the average particle size of 170nm and dimethylformamide, then coating the mixture on a substrate to form a film, finally performing hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric film I; wherein the manufacturer of the polyvinylidene fluoride-trifluoroethylene is Piezotech company of France, and the trademark is FC20; in the mixture, the mass ratio of the polyvinylidene fluoride-trifluoroethylene to the dimethylformamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 100V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 4 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (4) on the lower surface of the piezoelectric film I, continuously laying 4 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of wave troughs (4) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing for 20min at 85 ℃ under the pressure of 500N to obtain a pre-drawn body; conductive yarns I are penetrated in each pipeline, the diameter of each conductive yarn I before penetrating into the pipeline is 400 micrometers, the inner diameter of the pipeline is 40 percent of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20 percent larger than the inner diameter of the pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to one bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 60cm, the width is 8cm, and the height is 5cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, and the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 50% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 30% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 20% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drawn body prepared in the step (1.2) into hot drawing equipment for drawing to prepare a piezoelectric monofilament, wherein the drawing multiple is 25, and the drawing direction is parallel to a pipeline in the pre-drawn body;

the obtained piezoelectric monofilament has a rectangular belt-shaped structure as a whole, and the cross section of the piezoelectric monofilament is shown in fig. 3, and comprises an elastic cladding II 6 (the elastic cladding I before drafting), a piezoelectric film II 7 (the piezoelectric film I before drafting) and a conductive yarn II 8 with a circular cross section (the conductive yarn I before drafting); the piezoelectric film II 7 is fixed in the elastic cladding II 6 and has a waved band-shaped structure, and the undulation direction of the waved band-shaped structure is parallel to the width direction of the piezoelectric monofilament (i.e. the x direction in fig. 3); the central axis of the conductive yarn II 8 is parallel to the length direction of the piezoelectric monofilament (i.e., the y direction in fig. 3), the conductive yarn II 8 contacts with the cambered surface region of the wave trough of the piezoelectric film II 7 while the volume of the exposed part from the elastic cladding II 6 is 10%, the volume of the exposed part is 10% of the volume of the conductive yarn II 8, the number of the conductive yarn II 8 is 8 and is divided into two groups, one group is located above the piezoelectric film II 7 and is arranged at intervals, and the other group is located below the piezoelectric film II 7 and is arranged at intervals;

(2) Using 20-denier nylon multifilament as ground warp, using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, 20-denier nylon weft and 150-inch conductive weft (made of silver-plated nylon spun yarn) according to towel tissues by using a weaving process to obtain a woven tape with pile loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 50, the conductive weft yarns are adjacent to one pair of conductive weft yarns along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 3 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the space between the two conductive weft yarns in the same pair; as shown in fig. 4, which is a schematic diagram of the indentation process of piezoelectric flock, two rigid bars 9 can move toward each other to press the piezoelectric monofilaments to form creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

As shown in figure 1, the working unit of the velvet-shaped woven belt for night indication capable of generating power comprises nylon warp yarns 1, piezoelectric flock 2, nylon weft yarns 3 and conductive weft yarns 4, and the whole form of the working unit is shown in figure 2, and the working unit of the velvet-shaped woven belt for night indication capable of generating power is arranged on a woven belt bottom layer 5.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, when the angle of the vertical area of all the piezoelectric short velvet in any row changes 45 degrees in the same direction and the change speed is 20 degrees/s, the current can be generated to be 1.45mA.

Example 2

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 14 mu m, and the average length is 70mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride (a manufacturer is Shandong Huaxia Shenzhou New Material Co., ltd., the brand number is DS 202), barium titanate with the average particle size of 180nm and dimethylformamide, then coating the mixture on a substrate to form a film, finally, performing hot pressing treatment on the film to endow the film with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric film I; in the mixture, the mass ratio of polyvinylidene fluoride to dimethylformamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 120V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cube-shaped container, continuously laying 5 pipelines of which the central axes are parallel to the Y direction and are arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (5) on the lower surface of the piezoelectric film I, continuously laying 5 pipelines of which the central axes are parallel to the Y direction and are arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of the wave troughs (5) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing for 22min at 83 ℃ under the pressure of 550N to obtain a pre-drawn body; conductive yarn I penetrates through each pipeline, the diameter of the conductive yarn I before penetrating into the pipeline is 460 microns, the inner diameter of the pipeline is 35% of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20% larger than the inner diameter of the pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to one bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 62cm, the width is 8.4cm, and the height is 5.2cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 55% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 34% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 18% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drawn body prepared in the step (1.2) into hot drawing equipment for drawing to prepare a piezoelectric monofilament, wherein the drawing multiple is 20, and the drawing direction is parallel to a pipeline in the pre-drawn body;

the prepared piezoelectric monofilament is of a rectangular belt-shaped structure integrally and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and a conductive yarn II (the conductive yarn I before drafting) with a circular cross section; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 10 and the conductive yarn II is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using nylon multifilament with the fineness of 50 deniers as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, nylon weft with the fineness of 50 deniers and conductive weft (made of silver-plated nylon spun yarn) with the fineness of 130 inches by a weaving process according to towel tissues to obtain a woven belt with terry loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 45, the conductive weft yarns are adjacent to one pair of conductive weft yarns along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 3 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the space between the two conductive weft yarns in the same pair; the indentation treatment of the piezoelectric flock comprises the following steps: the two rigid strips move oppositely to compress the piezoelectric monofilaments to enable the piezoelectric monofilaments to have creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

The manufactured working unit of the velvet-shaped woven belt for night indication capable of generating power comprises nylon warp yarns, piezoelectric short velvet, nylon weft yarns and conductive weft yarns; the working units of the velvet-shaped woven belt for night indication capable of generating electricity are arranged on the bottom layer of the woven belt.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, the angle of the vertical area of all the piezoelectric short velvet in any row changes by 45 degrees towards the same direction, and the change speed is 25 degrees/s, the current can be generated by 1.4mA.

Example 3

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

slicing an elastomer: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, and the manufacturer is Taiwan rubber (Shanghai) industry Co., ltd, and the brand is SEBS-6152;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 17 mu m, and the average length is 60mm; a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride-trifluoroethylene, lead titanate with the average particle size of 190nm and dimethylformamide, then coating the mixture on a substrate to form a film, finally performing hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric film I; wherein the manufacturer of the polyvinylidene fluoride-trifluoroethylene is Piezotech France, and the trademark is FC20; in the mixture, the mass ratio of the polyvinylidene fluoride-trifluoroethylene to the dimethylformamide is 1, and the mass ratio of the lead titanate to the polyvinylidene fluoride-trifluoroethylene is 1; during polarization treatment, the voltage is increased once every 15min from 100V by taking 130V as a step length until 3500V is achieved;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 6 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (6) on the lower surface of the piezoelectric film I, continuously laying 6 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of wave troughs (6) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing at the temperature of 81 ℃ under the pressure of 600N for 23min to obtain a pre-drawn body; conductive yarns I are penetrated in each pipeline, the diameter of each conductive yarn I before penetrating into the pipeline is 470 mu m, the inner diameter of the pipeline is 30 percent of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20 percent larger than the inner diameter of the pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to a bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 65cm, the width is 8.8cm, and the height is 5.5cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 62% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 38% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 15% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drawn body prepared in the step (1.2) into hot drawing equipment for drawing to prepare a piezoelectric monofilament, wherein the drawing multiple is 18, and the drawing direction is parallel to a pipeline in the pre-drawn body;

the prepared piezoelectric monofilament is of a rectangular belt-shaped structure integrally and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and a conductive yarn II (the conductive yarn I before drafting) with a circular cross section; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 12, the conductive yarn II is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using polyamide multifilament with the fineness of 100 denier as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, polyamide weft with the fineness of 100 denier and conductive weft (made of silver-plated polyamide staple fiber yarn) with the fineness of 120 inches by a weaving process according to towel tissues to obtain a woven belt with pile loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 35, the same pair of conductive weft yarns are adjacent along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 5 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the space between the two conductive weft yarns in the same pair; the indentation treatment of the piezoelectric flock is as follows: the two rigid strips move oppositely to compress the piezoelectric monofilaments to enable the piezoelectric monofilaments to have creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is cut and indented, the piezoelectric monofilament section penetrating out from between two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, the angle of the vertical area of all the piezoelectric short velvet in any row changes by 45 degrees towards the same direction, and the change speed is 20 degrees/s, the current can be generated to be 1.33mA.

Example 4

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

elastomer slicing: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, the manufacturer is Taiwan rubber (Shanghai) industry Co., ltd, and the brand is SEBS-6151;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 19 mu m, and the average length of the copper fibers is 50mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride-trifluoroethylene, lead zirconate titanate with the average particle size of 200nm and dimethylformamide, then coating the mixture on a substrate to form a film, finally performing hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric film I; wherein the manufacturer of the polyvinylidene fluoride-trifluoroethylene is Piezotech company of France, and the trademark is FC20; in the mixture, the mass ratio of polyvinylidene fluoride-trifluoroethylene to dimethylformamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 140V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 7 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (7) on the lower surface of the piezoelectric film I, continuously laying 7 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of wave troughs (7) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing at the temperature of 79 ℃ under the pressure of 650N for 24min to obtain a pre-drawn body; each pipeline is internally penetrated with a conductive yarn I, the diameter of the conductive yarn I before penetrating into the pipeline is 550 mu m, the inner diameter of the pipeline is 28 percent of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20 percent larger than the inner diameter; the X direction is perpendicular to the Y direction, and the X direction is parallel to one bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 68cm, the width is 9.5cm, and the height is 5.8cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 65% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 40% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 14% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drafting body prepared in the step (1.2) into hot drafting equipment for drafting to prepare a piezoelectric monofilament, wherein the drafting multiple is 15, and the drafting direction is parallel to a pipeline in the pre-drafting body;

the prepared piezoelectric monofilament is of a rectangular belt-shaped structure integrally and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and a conductive yarn II (the conductive yarn I before drafting) with a circular cross section; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 14, the conductive yarn II is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using polyamide multifilament with the fineness of 150 deniers as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, polyamide weft with the fineness of 150 deniers and conductive weft (made of silver-plated polyamide staple fiber yarn) with the fineness of 90 inches by a weaving process according to towel tissues to obtain a woven belt with pile loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 30, the same pair of conductive weft yarns are adjacent along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 3 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven tape with the looped piles in the step (2), and respectively connecting two conductive weft yarns of the same pair with two poles of the LED lamp beads to obtain the pile-shaped woven tape for indicating at night, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the two conductive weft yarns of the same pair; the indentation treatment of the piezoelectric flock is as follows: the two rigid strips can move oppositely to compress the piezoelectric monofilaments so as to form creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, when the angle of the vertical area of all the piezoelectric short velvet in any row changes 45 degrees in the same direction and the change speed is 20 degrees/s, the current can be generated to be 1.25mA.

Example 5

A method for preparing a velvet woven belt for night indication capable of generating power comprises the following specific steps:

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 21 mu m, and the average length is 42mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride (manufacturer is Shandong Huaxia Shenzhou new material Co., ltd., the brand number is DS 202), lithium niobate with the average particle size of 210nm and dimethylacetamide, then coating the mixture on a substrate to form a film, finally, carrying out hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and carrying out polarization treatment to obtain a piezoelectric film I; in the mixture, the mass ratio of polyvinylidene fluoride to dimethylacetamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 150V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 7 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (7 in number) on the lower surface of the piezoelectric film I, continuously laying 7 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of the wave troughs (7 in number) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing at 77 ℃ for 25min under the pressure of 700N to obtain a pre-drafted body; each pipeline is internally penetrated with a conductive yarn I, the diameter of the conductive yarn I before penetrating into the pipeline is 580 mu m, the inner diameter of the pipeline is 36 percent of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20 percent larger than the inner diameter; the X direction is perpendicular to the Y direction, and the X direction is parallel to one bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 70cm, the width is 10.2cm, and the height is 6.2cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 70% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 43% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 13% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

(2) Using polyamide multifilament with the fineness of 200 deniers as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, polyamide weft with the fineness of 200 deniers and conductive weft (made of silver-plated polyamide staple fiber yarn) with the fineness of 65 inches by a weaving process according to towel tissues to obtain a woven belt with pile loops;

the conductive weft yarns in the manufactured woven belt with the terry are 25 pairs, the same pair of conductive weft yarns are adjacent to each other along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 5 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the two conductive weft yarns of the same pair; the indentation treatment of the piezoelectric flock is as follows: the two rigid strips can move oppositely to compress the piezoelectric monofilaments so as to enable the piezoelectric monofilaments to have creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, when the angle of the vertical area of all the piezoelectric short velvet in any row changes 45 degrees in the same direction and the change speed is 30 degrees/s, the current can be generated to be 1.17mA.

Example 6

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

elastomer slicing: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, and the manufacturer is Takawasaki (Shanghai) industry Co., ltd., and the trademark is SEBS-6151;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 25 mu m, and the average length is 39mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride-trifluoroethylene, sodium potassium niobate with the average particle size of 220nm and dimethylformamide, then coating the mixture on a substrate to form a membrane, finally performing hot-pressing treatment on the membrane to endow the membrane with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric membrane I; wherein the manufacturer of the polyvinylidene fluoride-trifluoroethylene is Piezotech company of France, and the trademark is FC20; in the mixture, the mass ratio of the polyvinylidene fluoride-trifluoroethylene to the dimethylformamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 160V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 8 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (8) on the lower surface of the piezoelectric film I, continuously laying 8 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of wave troughs (8) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing for 26min at the temperature of 75 ℃ under the pressure of 750N to obtain a pre-drawn body; each pipeline is internally penetrated with a conductive yarn I, the diameter of the conductive yarn I before penetrating into the pipeline is 650 microns, the inner diameter of the pipeline is 25 percent of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20 percent larger than the inner diameter; the X direction is perpendicular to the Y direction, and the X direction is parallel to a bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 73cm, the width is 11cm, and the height is 6.5cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, and the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-drafting body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-drafting body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 72% of the height of the pre-drafting body, the minimum thickness of the piezoelectric film I is 45% of the height of the pre-drafting body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-drafting body is 12% of the width of the pre-drafting body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-drafting body is 0;

(1.3) drafting;

putting the pre-drafting body prepared in the step (1.2) into hot drafting equipment for drafting to prepare a piezoelectric monofilament, wherein the drafting multiple is 13, and the drafting direction is parallel to a pipeline in the pre-drafting body;

the whole piezoelectric monofilament is of a rectangular belt-shaped structure and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and conductive yarns II (the conductive yarns I before drafting) with round cross sections; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 16 and is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using polyamide multifilament with the fineness of 250 deniers as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, polyamide weft with the fineness of 250 deniers and conductive weft (made of silver-plated polyamide staple fiber yarn) with the fineness of 55 inches by a weaving process according to towel tissues to obtain a woven belt with pile loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 20, the conductive weft yarns are adjacent to one pair of conductive weft yarns along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 3 nylon weft yarns; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven tape with the looped piles in the step (2), and respectively connecting two conductive weft yarns of the same pair with two poles of the LED lamp beads to obtain the pile-shaped woven tape for indicating at night, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the space between the two conductive weft yarns in the same pair; the indentation treatment of the piezoelectric flock comprises the following steps: the two rigid strips can move oppositely to compress the piezoelectric monofilaments so as to enable the piezoelectric monofilaments to have creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is cut and indented, the piezoelectric monofilament section penetrating out from between two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, when the angle of the vertical area of all the piezoelectric short velvet in any row changes 45 degrees in the same direction and the change speed is 22 degrees/s, the current can be generated to be 1.1mA.

Example 7

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

elastomer slicing: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, and the manufacturer is Takaoliang (Shanghai) industry Co., ltd., and the trademark is SEBS-6150;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 32 mu m, and the average length is 37mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polystyrene (manufacturer is Shanghai Seikeke petrochemical engineering Limited liability company, the mark is 622P), zinc oxide with the average particle size of 230nm and dimethylacetamide, then coating the mixture on a substrate to form a film, finally, carrying out hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and carrying out polarization treatment to obtain a piezoelectric film I; in the mixture, the mass ratio of polystyrene to dimethylacetamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 180V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 9 pipelines of which the central axes are parallel to the Y direction and are arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (9 in number) on the lower surface of the piezoelectric film I, continuously laying 9 pipelines of which the central axes are parallel to the Y direction and are arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of the wave troughs (9 in number) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing for 28min at 73 ℃ under the pressure of 800N to obtain a pre-drafted body; conductive yarn I penetrates through each pipeline, the diameter of the conductive yarn I before penetrating into the pipeline is 2400 micrometers, the inner diameter of the pipeline is 25% of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20% larger than the inner diameter of the pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to a bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 76cm, the width is 11.5cm, and the height is 6.7cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 77% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 47% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 12% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drafting body prepared in the step (1.2) into hot drafting equipment for drafting to prepare a piezoelectric monofilament, wherein the drafting multiple is 10, and the drafting direction is parallel to a pipeline in the pre-drafting body;

the whole piezoelectric monofilament is of a rectangular belt-shaped structure and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and conductive yarns II (the conductive yarns I before drafting) with round cross sections; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the wavy fluctuation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 18, the conductive yarn II is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using chinlon multifilament with the fineness of 1200 denier as ground warp, simultaneously using piezoelectric monofilaments as pile warp, and weaving the ground warp, the pile warp, chinlon weft with the fineness of 1200 denier and conductive weft (made of silver-plated chinlon spun yarn) with the fineness of 2 inches by a weaving process according to towel tissues to obtain a woven belt with pile loops;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 15, the same pair of conductive weft yarns are adjacent along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 1 nylon weft yarn; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the two conductive weft yarns of the same pair; the indentation treatment of the piezoelectric flock is as follows: the two rigid strips can move oppositely to compress the piezoelectric monofilaments so as to enable the piezoelectric monofilaments to have creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is cut and indented, the piezoelectric monofilament section penetrating out from between two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, when the angle of the vertical area of all the piezoelectric short velvet in any row changes 45 degrees in the same direction and the change speed is 150 degrees/s, the current can be generated to be 1.3mA.

Example 8

(1) Preparing a piezoelectric monofilament;

(1.1) preparing raw materials;

slicing an elastomer: the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, and the manufacturer is Takaoliang (Shanghai) industry Co., ltd., and the trademark is SEBS-6150;

the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers forming the copper fiber spun yarn is 40 mu m, and the average length of the copper fibers is 33mm;

a piezoelectric film I: firstly, preparing a mixture consisting of polyvinylidene fluoride-trifluoroethylene, zinc oxide with the average particle size of 180nm and dimethylformamide, then coating the mixture on a substrate to form a film, finally performing hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and performing polarization treatment to obtain a piezoelectric film I; wherein the manufacturer of the polyvinylidene fluoride-trifluoroethylene is Piezotech company of France, and the trademark is FC20; in the mixture, the mass ratio of the polyvinylidene fluoride-trifluoroethylene to the dimethylformamide is 1; during polarization treatment, the voltage is increased once every 15min from 100V to 3500V by taking 150V as a step length;

(1.2) preparing a pre-drawing body;

laying a layer of elastomer slices at the bottom of a cubic container, continuously laying 10 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, continuously laying a layer of piezoelectric film I in the step (1.1), wherein the wave fluctuation direction of the piezoelectric film I is parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of wave troughs (10) on the lower surface of the piezoelectric film I, continuously laying 10 pipelines with central axes parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of wave troughs (10) on the upper surface of the piezoelectric film I, continuously laying a layer of elastomer slices to completely cover the pipelines, and then carrying out hot pressing for 30min at the temperature of 70 ℃ under the pressure of 1000N to obtain a pre-drawn body; conductive yarn I penetrates through each pipeline, the diameter of the conductive yarn I before penetrating into the pipeline is 3050 mu m, the inner diameter of the pipeline is 30% of the diameter of the conductive yarn I before penetrating into the pipeline, and the outer diameter of the pipeline is 20% larger than the inner diameter of the pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to one bottom edge of the container;

the whole prepared pre-drafting body is of a rectangular block structure, the length is 80cm, the width is 12cm, and the height is 7cm; the pre-drafting body comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the central axis of the pipeline is parallel to the length direction of the pre-drafting body; the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 80% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 50% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 10% of the width of the pre-stretching body, and the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0;

(1.3) drafting;

putting the pre-drafting body prepared in the step (1.2) into hot drafting equipment for drafting to prepare a piezoelectric monofilament, wherein the drafting multiple is 5, and the drafting direction is parallel to a pipeline in the pre-drafting body;

the prepared piezoelectric monofilament is of a rectangular belt-shaped structure integrally and comprises an elastic cladding II (the elastic cladding I before drafting), a piezoelectric film II (the piezoelectric film I before drafting) and a conductive yarn II (the conductive yarn I before drafting) with a circular cross section; the piezoelectric film II is fixed in the elastic cladding II and is of a wavy strip-shaped structure, and the undulation direction of the piezoelectric film II is parallel to the width direction of the piezoelectric monofilaments; the central axis of the conductive yarn II is parallel to the length direction of the piezoelectric monofilament, the conductive yarn II is in contact with the cambered surface area of the wave trough of the piezoelectric film II and exposes out of the elastic cladding II, the volume of the exposed part is 10% of the volume of the conductive yarn II, the number of the conductive yarn II is 20, the conductive yarn II is divided into two groups, one group is positioned above the piezoelectric film II and arranged at intervals, and the other group is positioned below the piezoelectric film II and arranged at intervals;

(2) Using 3000-denier nylon multifilament as ground warp, using piezoelectric monofilament as warp, and weaving the ground warp, the warp, 3000-denier nylon weft and 1-inch conductive weft (made of silver-plated nylon spun yarn) according to towel tissue by using a weaving process to obtain a woven belt with terry;

the number of the conductive weft yarns in the manufactured woven belt with the terry is 10, the conductive weft yarns are adjacent to one pair of conductive weft yarns along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by 1 nylon weft yarn; two surfaces of the piezoelectric monofilaments exposed out of the conductive yarn II are respectively contacted with two conductive weft yarns of the same pair;

(3) Cutting off the piezoelectric monofilaments (piezoelectric short velvet is obtained after the piezoelectric monofilaments are cut off) and indenting the piezoelectric monofilaments of the woven belt with the terry in the step (2), and respectively connecting two conductive weft yarns of the same pair with two electrodes of an LED lamp bead to obtain the wool-shaped woven belt for night indication, which can generate electricity; the cutting treatment is to cut the top end of each looped pile, the top end of the looped pile in the woven belt with the looped piles is positioned between two adjacent pairs of conductive weft yarns, and the looped pile passes through the space between the two conductive weft yarns in the same pair; the indentation treatment of the piezoelectric flock comprises the following steps: the two rigid strips can move oppositely to compress the piezoelectric monofilaments so as to form creases; the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is subjected to cutting treatment and indentation treatment, the piezoelectric monofilament section penetrating out from between the two conductive weft yarns in the same pair forms a certain included angle with other sections.

When the prepared velvet-shaped night indication woven belt capable of generating electricity is cut into a fabric with the width of 10cm, the angle of the vertical area of all the piezoelectric short velvet in any row changes by 45 degrees towards the same direction, and the change speed is 85 degrees/s, and the current can be generated by 1.6mA.

Claims

1. A method for preparing a velvet-shaped woven belt for night indication capable of generating electricity is characterized in that nylon multifilament is used as ground warp, piezoelectric monofilaments are used as hair warp, the ground warp, the hair warp, nylon weft and conductive weft are woven according to towel tissues by a weaving process to obtain the woven belt with terry loops, the piezoelectric monofilaments are subjected to cutting treatment and indentation treatment, and the conductive weft is connected with LED lamp beads to obtain the velvet-shaped woven belt for night indication capable of generating electricity;

the conductive weft yarns in the woven belt with the terry are in multiple pairs, the same pair of conductive weft yarns is adjacent to each other along the weft direction of the woven belt, and different pairs of conductive weft yarns are separated by one or more nylon weft yarns; cutting off the top ends of the looped piles, wherein the top ends of the looped piles in the woven belt with the looped piles are positioned between two adjacent pairs of conductive weft yarns, and the pile warp penetrates out of the two conductive weft yarns in the same pair; connecting the conductive weft yarns with the LED lamp beads, namely connecting two conductive weft yarns of the same pair with two poles of the LED lamp beads respectively;

the piezoelectric monofilament has plasticity, and after the piezoelectric monofilament is cut and indented, the piezoelectric monofilament section penetrating out from between two conductive weft yarns in the same pair forms a certain included angle with other sections.

2. The method for preparing a velvet-like woven belt for night indication according to claim 1, wherein the exposed portion of the conductive yarn II from the elastic covering II has a volume of 10-30% of the volume of the conductive yarn II.

3. The method for preparing a velvet-like night indicator woven belt capable of generating electricity according to claim 2, wherein the piezoelectric monofilaments are prepared by the following steps:

(1) Preparing a pre-drawing body;

the pre-drafting body is integrally in a rectangular block structure and comprises an elastic cladding I, a piezoelectric film I and a copper pipeline with a circular cross section, wherein the piezoelectric film I and the pipeline are fixed inside the elastic cladding I; the piezoelectric film I is of a wavy strip-shaped structure, and the undulation direction of the piezoelectric film I is parallel to the width direction of the pre-drafting body, namely the left and right directions of the pre-drafting body; the central axis of the pipeline is parallel to the length direction of the pre-drafting body, namely parallel to the front and back direction of the pre-drafting body, the pipeline is contacted with the cambered surface area of the wave trough of the piezoelectric film I, the number of the pipelines is multiple and divided into two groups, one group is positioned above the piezoelectric film I and arranged at intervals, and the other group is positioned below the piezoelectric film I and arranged at intervals; each pipeline is internally threaded with a conductive yarn I, the diameter of the conductive yarn I before penetrating into the pipeline is larger than the inner diameter of the pipeline, one end of the conductive yarn I is compressed and connected with one end of a traction rope, and the other end of the traction rope penetrates out of the pipeline and then pulls the conductive yarn I to realize that the conductive yarn I penetrates into the pipeline;

(2) Drafting;

and (3) placing the pre-drafting body in hot drafting equipment for drafting, wherein the drafting direction is parallel to the pipeline in the pre-drafting body.

4. The method for preparing a velvet-like woven belt for night indication capable of generating electricity according to claim 3, wherein in the step (1), the pre-drafting body has a length of 60 to 80cm, a width of 8.0 to 12.0cm and a height of 5.0 to 7.0cm;

the pre-stretching body and the piezoelectric film I are of vertically symmetrical structures, the symmetrical surfaces of the pre-stretching body and the piezoelectric film I are overlapped, the maximum thickness of the piezoelectric film I is 50% -80% of the height of the pre-stretching body, the minimum thickness of the piezoelectric film I is 30% -50% of the height of the pre-stretching body, the distance between the left end or the right end of the piezoelectric film I and the long height surface of the pre-stretching body is 10% -20% of the width of the pre-stretching body, the distance between the front end or the rear end of the piezoelectric film I and the wide height surface of the pre-stretching body is 0, the long height surface of the pre-stretching body is a surface where the long edge and the high edge of the pre-stretching body are located together, and the wide height surface of the pre-stretching body is a surface where the wide edge and the high edge of the pre-stretching body are located together; the number of wave troughs on the piezoelectric film I is equal to that of the pipelines;

in the step (2), the draft multiple is 5 to 25.

5. The method for preparing a velvet-like woven belt for night indication capable of generating electricity according to claim 4, wherein the pre-drafting body is prepared by the following steps: firstly, laying a layer of elastomer slices at the bottom of a cubic container, then continuously laying a plurality of pipelines with central shafts parallel to the Y direction and arranged at intervals along the X direction, then continuously laying a piezoelectric film I with a wave-shaped belt-shaped structure and wave fluctuation directions parallel to the X direction, controlling the pipelines below the piezoelectric film I to be in contact with the cambered surface area of the wave trough on the lower surface of the piezoelectric film I, then continuously laying a plurality of pipelines with central shafts parallel to the Y direction and arranged at intervals along the X direction, controlling the pipelines above the piezoelectric film I to be in contact with the cambered surface area of the wave trough on the upper surface of the piezoelectric film I, and finally continuously laying a layer of elastomer slices to completely cover the pipelines and then carrying out hot pressing to obtain a pre-drafting body; conductive yarns I are penetrated in each pipeline; the X direction is perpendicular to the Y direction, and the X direction is parallel to a bottom edge of the container.

6. The method for preparing a velvet-like night indicator woven belt capable of generating electricity according to claim 5, wherein the elastomer is a polystyrene-ethylene-butadiene-styrene block copolymer, the conductive yarn I is a copper fiber spun yarn, the average diameter of copper fibers constituting the copper fiber spun yarn is 12 to 40 μm, and the average length is 33 to 80mm; the hot pressing temperature is 70-85 ℃, the hot pressing time is 20-30 min, and the hot pressing pressure is 500-1000N.

7. The method for preparing the velvet-shaped woven belt for night indication capable of generating electricity according to claim 5, wherein the piezoelectric film I is prepared by the following steps: firstly, preparing a mixture consisting of a piezoelectric polymer, piezoelectric ceramics and a solvent, then coating the mixture on a substrate to form a film, finally, carrying out hot-pressing treatment on the film to endow the film with a wavy strip-shaped structure, and carrying out polarization treatment to obtain a piezoelectric film I.

8. The method for preparing the power-generating velvet-shaped woven belt for night indication according to claim 7, wherein the piezoelectric polymer is polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polymethyl methacrylate, polyvinyl chloride, polystyrene or polyacetylene; the piezoelectric ceramic is barium titanate, lead zirconate titanate, lithium niobate, potassium sodium niobate or zinc oxide, and the average particle size of the piezoelectric ceramic is 200 +/-30 nm.

9. The method for preparing a velvet type night indicator woven belt capable of generating electricity according to claim 7, wherein the mass ratio of the piezoelectric polymer to the solvent in the mixture is 1.

10. The method for preparing the velvet-shaped woven belt for night indication capable of generating power as claimed in claim 1, wherein the fineness of the nylon multifilament and the nylon weft yarn is 20-3000 denier, and the conductive weft yarn is silver-plated nylon spun yarn with the fineness of 150-1 inch.