Sound-absorbing bonded fabric based on contact electrification of materials by vibration and its application

Abstract

The present invention discloses a sound-absorbing joint fabric that is based on contact electrification of materials by vibration, and its application, belonging to the field of sound-absorbing materials. The joint fabric of the present invention is composed of upper and lower ground tissue unit layers and an intermediate fabric layer. The intermediate fabric layer contains multiple warp-through areas and multiple non-warp-through areas that appear alternately. The ground tissue yarn and the vibration unit have different electrostatic sequences. The distance between the ground tissue unit layer and the intermediate fabric layer is less than the amplitude of the vibration unit. The two are electrified by contact separation, resulting in charge transfer. At the same time, the porous structure of the fabric itself is utilized for double sound absorption. The present invention provides the fabric with an additional way to consume sound energy through contact electrification, making the fabric more efficient in sound absorption. It can selectively reduce noise of specific frequencies, especially low-frequency noise, and the resulting fabric is light, thin and breathable. The present invention is used as a fabric for curtains, door curtains, door decorations, tarpaulins or car interiors.

Description

Technical Field

[0001] The invention belongs to the field of sound-absorbing materials and relates to a spliced ​​fabric, in particular to a sound-absorbing spliced ​​fabric capable of electrifying materials through contact due to vibration and application thereof. Background Art

[0002] Textiles, as a typical porous material, have been widely used in the field of sound absorption. Because porous materials contain numerous interconnected pores that lead to the surface, when sound waves propagate to the surface, the mechanical energy of the sound waves is converted into kinetic energy of the air within the component or the component itself. Viscous interactions between air and friction between air and the material further convert this kinetic energy into heat. Finally, this heat is dissipated through heat transfer, effectively absorbing the sound energy.

[0003] Currently, the sound absorption principles of sound-absorbing materials primarily focus on porous sound absorption mechanisms. These materials often suffer from defects such as insufficient air permeability or a narrow sound absorption range. For example, Chinese invention patent publication number CN109551834B discloses a flame-retardant sound-absorbing curtain fabric. This fabric comprises a linen base layer, an aramid flame-retardant layer, a polyethylene bubble plastic film sound-insulating layer, and an outer layer sewn together with stitching. While this design achieves flame retardancy and sound insulation, the curtain fabric is too thick and airtight. Chinese invention patent publication number CN113243739B discloses a UV-resistant sound-absorbing curtain and its preparation method. This method involves preparing collagen-modified acrylic fibers through secondary electrospinning, filling the gaps in the modified acrylic fibers with zirconium dioxide aerogel and polyimide aerogel films, and then fabricating the fibers into curtain fabric. This fabric exhibits excellent UV protection, but the production process is complex, production efficiency is low, and the sound absorption range is limited to high frequencies.

[0004] In addition to the porous sound absorption mechanism, the consumption or utilization of sound waves can also generate electricity through triboelectric charging. However, the existing technology based on this principle is mainly aimed at energy collection, not sound absorption and noise reduction. Moreover, the product structures produced by related technologies are often large in size and not light and thin in shape, which is not suitable for sound absorption and noise reduction scenarios. For example, Chinese invention patent application with publication number CN105208497A discloses an acoustic-to-electric conversion device based on triboelectric power generation and its manufacturing method, and Chinese invention patent with publication number CN112910303B discloses an acoustic triboelectric nanogenerator based on a quarter-wavelength tube. Both are not suitable for application scenarios in home textile accessories.

[0005] In summary, current sound-absorbing materials mostly adopt a single porous sound absorption principle, and the sound absorption frequency range is narrow, mainly concentrated in high frequencies. The preparation process is complicated, and the sound-absorbing materials produced have problems such as being thick and airtight. Summary of the Invention

[0006] To address the above-mentioned deficiencies in the prior art, the present invention aims to provide a sound-absorbing bonded fabric based on contact electrification of materials by vibration, and a method for preparing the same. By utilizing the dual energy dissipation principles of contact electrification and porous sound absorption, a bonded fabric with a porous structure that allows materials to be electrified by contact and separation is produced, thereby expanding the sound absorption frequency range and resolving the problem that the principle of frictional power generation is not suitable for home textile applications.

[0007] Another object of the present invention is to provide an application of the above-mentioned sound-absorbing joint fabric based on vibration-induced material contact electrification, so as to achieve the purpose of improving the sound absorption effect by forming an air layer between the sound-absorbing fabric and the rigid wall.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A sound-absorbing, bonded fabric that causes contact electrification of materials based on vibration, comprising a ground unit layer composed of ground yarns and an intermediate fabric layer composed of intermediate warp yarns and intermediate weft yarns, wherein the ground yarns include ground warp yarns and ground weft yarns, and the ground unit layer includes an upper ground unit layer and a lower ground unit layer formed by normal drawing-in of the ground yarns; the intermediate fabric layer is divided into a plurality of alternating drawn-in areas and a plurality of non-drawn-in areas by partial drawing-in of the intermediate warp yarns and the intermediate weft yarns;

[0010] The middle layer weft yarns in the non-threaded area serve as vibration units that vibrate under the action of sound waves; the middle layer warp yarns and / or the ground tissue warp yarns serve as consolidation units, and the middle fabric layer and the ground tissue unit layer are woven into one by exchanging positions in the threaded area. The two ends of the vibration unit are fixed, and the middle fabric layer is sandwiched between the upper and lower ground tissue unit layers, forming a pore structure for contacting, separating, and electrifying the vibration unit and the ground tissue unit layer.

[0011] The ground yarn and the vibration unit have different electrostatic sequences, and the distance between the ground unit layer and the middle fabric layer is smaller than the amplitude of the vibration unit.

[0012] Among them, since the electrostatic sequences of the ground yarn and the vibration unit are different, one is easy to gain electrons and the other is easy to lose electrons. Therefore, when the two come into contact and separate, charge transfer occurs between the two materials.

[0013] The materials for the ground yarn and the vibration unit can be selected from dielectric fibers and conductive fibers respectively. Alternatively, two materials with large electronegativity differences that can generate charge transfer can be selected from the dielectric fibers.

[0014] Preferably, the vibration unit and the consolidation units at both ends thereof form a simply supported beam vibration string structure, and the ground tissue unit layer and the middle fabric layer are connected by the simply supported beam vibration string structure, so that the ground tissue yarn and the vibration unit are in contact and separated and electrified, thereby generating charge transfer;

[0015] The simply supported beam vibrating string structure satisfies Where, f jmn is the nth order resonance frequency of the vibration unit, l jm is the resonance length of the vibration unit, δ j is the linear density of the vibration unit.

[0016] Preferably, the resonance length of the vibration unit is 1-200 mm, and the linear density of the vibration unit is 3-250 tex. The material constituting the vibration unit includes monofilament yarn, multifilament yarn or composite twisted yarn.

[0017] Preferably, the normal menstrual passage is through the three original tissues or complex tissues;

[0018] The partial drawing-in means that the warp yarn is only drawn in the drawing-in area, and the non-drawing-in area contains only the middle layer of weft yarn;

[0019] The width of the non-warp-threaded area in the weft direction is 1-200 mm.

[0020] Preferably, the linear density of the ground yarn is 4 to 250 tex, and the gram weight of the ground unit layer is 65 to 1500 g / m 2 The warp density of the ground tissue unit layer and the warp threading area is 200 to 1700 strands / 10cm, and the weft density of the ground tissue unit layer and the warp threading area is 150 to 1200 strands / 10cm.

[0021] Preferably, the raw material for making the ground yarn is conductive fiber or dielectric fiber; the raw material for making the vibration unit is also conductive fiber or dielectric fiber;

[0022] The conductive fiber or dielectric fiber is at least one of a single component fiber, a fiber having conductive properties obtained by surface processing, and a sheath-core composite fiber whose sheath contains dielectric fiber or conductive fiber;

[0023] The dielectric fiber is at least one of polyoxymethylene fiber, polyamide fiber, melamine fiber, wool fiber, silk fiber, cotton fiber, hemp fiber, regenerated cellulose fiber, regenerated protein fiber, polyvinyl alcohol, polyimide fiber, polytetrafluoroethylene fiber, polyvinyl chloride fiber, chlorinated polyvinyl chloride fiber, polypropylene fiber, polyethylene fiber, polyvinyl alcohol fiber, polyvinylidene fluoride fiber, polyester fiber, polyurethane fiber, nylon fiber and polyacrylonitrile fiber;

[0024] The conductive fiber is at least one of metal conductive fiber, metal-plated fiber, conductive metal compound conductive fiber, metal complex fiber, carbon-based conductive fiber and conductive polymer fiber.

[0025] Among them, the conductive fiber can be obtained by coating a conductive layer on the surface of a pressed yarn warp knitted fabric by an impregnation method, a chemical method, a spin coating method, a surface deposition method, a printing method or an electrospinning method, and the material of the conductive layer is at least one of silver, aluminum, copper, nickel, silver oxide, aluminum oxide, copper oxide and nickel oxide.

[0026] Wherein, the chemical method includes in-situ polymerization, chemical plating or electrochemical method;

[0027] The surface deposition method includes polymer vapor deposition, magnetron sputtering or atomic deposition;

[0028] The printing method includes screen printing or inkjet printing.

[0029] The method for preparing the sound-absorbing bonded fabric based on vibration-induced material contact electrification of the present invention is as follows:

[0030] 1) According to the noise frequency range to be solved, calculate the resonant frequency and corresponding length l of the resonant unit yarn jm , taking weaving shrinkage into consideration, the width of the non-warp area in the weft direction is calculated based on the weaving shrinkage, and the linear density δ of the vibration unit is calculated. j , the design is based on the distribution of non-drawn-in areas and drawn-in areas and the selection of yarn parameters and types;

[0031] 2) using a weaving machine for weaving, the warp yarns of the upper ground unit layer, the lower ground unit layer, and the middle fabric layer are controlled by different heald frames, and the healds and reeds are drawn in accordance with a designed warp yarn arrangement; during weaving, the upper ground unit layer, the lower ground unit layer, and the middle fabric layer are woven in sequence, and then the warp yarns of the middle fabric layer and the warp yarns of the upper and lower ground unit layers are weaved and transferred, and the transferred warp yarns sew the upper and lower ground unit layers into one, thereby producing a sound-absorbing stitched fabric in which the materials are electrified by contact due to vibration;

[0032] At the same time, the warp yarns of the middle fabric layer are not fully drawn in. Where there are no middle layer warp yarns, the middle layer weft yarns are exposed and become floating yarns, serving as vibration units.

[0033] The present invention also provides an application of a sound-absorbing, bonded fabric that generates electrical charge through contact with materials caused by vibration. The sound-absorbing, bonded fabric can be used as curtains, door curtains, door trims, tarpaulins, or automotive interior fabrics, creating an air layer between the fabric and rigid walls, such as walls, glass walls, and metal walls, for sound absorption. The thickness of the air layer is greater than 0 and less than or equal to 500 mm.

[0034] Preferably, the thickness of the air layer is Where λ is the wavelength of the sound wave being absorbed.

[0035] The present invention also provides another application of a sound-absorbing joint fabric that is based on vibration to cause material contact electrification. There is no air layer between the sound-absorbing joint fabric and the rigid wall, and the sound-absorbing joint fabric is closely attached to the rigid wall such as a wall, a glass wall, and a metal wall.

[0036] The principle of the present invention is: the sound-absorbing jointed fabric that causes the material to be electrified by contact due to vibration can absorb noise based on a dual energy-consuming sound-absorbing mechanism through a simply supported beam vibration string structure and a pore structure. The first energy-consuming mechanism is based on the contact electrification principle to convert the mechanical energy of the sound wave into kinetic energy, so that the yarn materials with different electrostatic sequences are contact-electrified to realize the transfer of charge, thereby converting the mechanical energy into electrical energy; the second energy-consuming mechanism is based on the porous sound absorption principle, utilizing the pore structure formed by the weaving of yarns in the fabric, and the yarn increasing the tortuosity of the fabric pore structure, to convert the sound energy into heat energy.

[0037] Due to the adoption of the above technical solution, the sound-absorbing bonded fabric based on vibration-induced material contact electrification of the present invention has the following beneficial effects compared with the prior art:

[0038] (1) The bonding fabric of the present invention adopts the contact electrification principle, which is a new sound absorption mechanism. Through the design of the fabric structure, dual energy consumption is achieved. On the basis of the porous sound absorption principle, through the sound-to-electricity conversion mechanism, the fabric has an additional way to consume sound energy, thereby improving the sound absorption effect of the fabric;

[0039] (2) The binding fabric of the present invention, by selecting yarns with specific parameters and categories and adjusting the relevant parameters of the simply supported beam vibrating chord structure, makes the warp-through area and the non-warp-through area of ​​the middle fabric layer have a specific distribution state, thereby selectively reducing the noise of specific frequencies, thereby expanding the sound absorption frequency range and being able to effectively absorb low-frequency noise;

[0040] (3) The knitted fabric prepared by the present invention retains the characteristics of being light, soft, breathable, comfortable, and having good mechanical properties, and is suitable for use as a door curtain, door trim, tarpaulin, or automobile interior fabric. In application scenarios, an air layer is provided behind the fabric to further enhance the overall sound absorption effect.

[0041] The preparation method of the present invention is simple and can be produced through one-piece molding or step-by-step processing, which can improve production efficiency and facilitate mass production. The bonded fabric of the present invention also has the potential to be used in friction generators and has the prospect of further improvement to play its role in the fields of energy and self-driven sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention's bonded fabric that generates electrification through contact of materials based on vibration, applied to a rigid wall. In the figure: 11 - ground tissue unit layer; 12 - middle fabric layer; 13 - vibration unit; 2 - air layer; 3 - rigid wall;

[0044] Figure 2 Graphs showing the sound absorption test results of the sound-absorbing bonded fabrics Z1 to Z5 prepared in Examples 1 to 5 of the present invention, wherein A is a graph showing the sound absorption coefficient test results of the sound-absorbing bonded fabrics Z1 to Z5 in the test range of 100-5000 Hz, and B is a partial enlarged view of the shaded area in A. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below through specific embodiments. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention and are not intended to limit the present invention.

[0046] Unless otherwise specified, the materials and reagents used in the examples of the present invention can be obtained from commercial sources. Experimental methods without specific conditions in the examples are generally performed under conventional conditions or the conditions recommended by the manufacturer.

[0047] Example 1

[0048] This embodiment provides a method for preparing and applying a sound-absorbing joint fabric that generates electrification of materials through contact based on vibration.

[0049] 1) The specific preparation method is as follows:

[0050] (1) Fabric parameter design:

[0051] In order to absorb noise with a frequency range of 100-5000Hz, firstly, the porosity of the fabric is used to absorb the full-frequency noise. Secondly, for the noise frequencies around 300Hz and 450Hz that are difficult for porous fabrics to absorb and often occur in daily life, the formula It is estimated that when the yarn tension T in the fabric is 2 cN, the vibration unit uses a yarn density δ j The first resonance frequency f of the vibration unit with different lengths is 300Hz and 450Hz respectively. jmn , that is, n is 1, and the resonance length l of each corresponding vibration unit is calculated jmThe widths of the warp and weft yarns in the middle fabric layer are 30 mm and 20 mm respectively. Based on the above data, the middle fabric layer is divided into two alternating non-wearing areas and three wearing areas by the middle layer warp yarn and the middle layer weft yarn through incomplete wearing. The width of the first non-wearing area in the weft direction is 30 mm, the width of the second non-wearing area in the weft direction is 20 mm, and the width of the wearing areas in the weft direction is 70 mm.

[0052] The linear density of the ground yarn is 55tex, and the weight of the ground unit layer is 260g / m 2 The warp density of the ground tissue unit layer and the warp threading area is 205 strands / 10cm, and the weft density of the ground tissue unit layer and the warp threading area is 155 strands / 10cm.

[0053] Polyester monofilament (polyester fiber) is used as the ground yarn and middle layer warp yarn, and polyvinylidene fluoride monofilament (PVDF) is used as the middle layer weft yarn. The electrostatic sequences of the ground yarn (made of polyester) and the vibration unit (made of PVDF) are different.

[0054] (2) Fabric weaving:

[0055] Weaving is performed using a loom, wherein the ground unit layer 11 and the middle layer warp yarns are controlled by different heald frames, and the reed and weft yarns are drawn in according to the fabric parameter design in (1). During weaving, a 100 reed / 10cm steel reed is used, the upper machine warp density is 200 threads / 10cm, and the weft density is 177 threads / 10cm. The upper ground unit layer, the middle fabric layer 12, and the lower ground unit layer are woven in sequence, and the ground unit layer 11 is drawn in using the three-primary weave; the middle layer warp yarns and the upper and lower ground warp yarns are drawn in the weft area. The positions are exchanged, and the middle fabric layer 12 is woven with the upper and lower ground tissue unit layers into an integral fabric with the middle fabric layer 12 sandwiched in the middle. The middle layer warp yarns are not drawn in full width, and in the non-drawn-in areas where there are no middle layer warp yarns, the middle layer weft yarns are exposed as floating yarns, serving as vibration units 13. By exchanging the positions in the drawn-in areas, the middle layer warp yarns become consolidation units, and the two ends of the vibration unit 13 are fixed, and the yarns are interwoven to form a pore structure for contacting, separating, and electrifying the vibration unit 13 and the ground tissue unit layer 11.

[0056] By the above-mentioned weaving method, a sound-absorbing knitted fabric in which materials are electrified by contact due to vibration is produced, which is recorded as sound-absorbing knitted fabric Z1.

[0057] 2) The sound-absorbing binding fabric Z1 is used for sound absorption, and the specific process is as follows:

[0058] Take the sound-absorbing bonding fabric Z1 and hang it on the glass wall 3 (a rigid wall). Make the thickness of the air layer 2 between the sound-absorbing bonding fabric Z1 and the glass wall 280mm (one-fourth of the wavelength of a 300Hz sound wave, λ = c / f, λ is the wavelength, c = 340m / s is the speed of the sound wave in air, and f is the frequency of the sound wave). The overall structure is as follows: Figure 1 shown.

[0059] like Figure 1 The sound-absorbing joint fabric Z1 is woven into a whole by a ground tissue unit layer 11 and an intermediate fabric layer 12 sandwiched between the upper and lower ground tissue unit layers; the intermediate fabric layer 12 is divided into five areas, namely a first warp-through area, a first non-warp-through area, a second warp-through area, a second non-warp-through area, and a third warp-through area; the weft yarns of the intermediate layer in the non-warp-through area are vibration units 13, and the intermediate layer warp yarns of the intermediate fabric layer 12 serve as consolidation units. The two ends of the vibration unit are fixed by position exchange in the warp-through area. The vibration unit 13 and the consolidation units at both ends form a simply supported beam vibration string structure. The ground tissue unit layer and the intermediate fabric layer 12 are electrically charged by contact and separation through the simply supported beam vibration string structure, resulting in charge transfer;

[0060] The simply supported beam vibrating string structure satisfies Where, f jmn is the nth order resonance frequency of the vibration unit, l jm is the resonance length of the vibration unit, δ j is the linear density of the vibration unit. Numerically, the resonance length is equal to the width of the non-warp area in the weft direction.

[0061] Examples 2 to 5

[0062] Examples 2 to 5 are respectively a sound-absorbing knitted fabric based on vibration-induced material contact electrification and a preparation method thereof. The prepared sound-absorbing knitted fabrics based on vibration-induced material contact electrification are marked Z2 to Z5, respectively. Their preparation methods are basically the same as those of Example 1, and the only difference is the raw materials, weaving method and process parameters. See Table 1 for details:

[0063] Among them, the difference between Example 2 and Example 1 is that the width of the non-warp area is different, the difference between Example 3 and Example 1 is that the middle layer weft yarn material is different, the difference between Example 4 and Example 1 is that the air layer thickness is different, and the difference between Example 5 and Example 1 is that the yarn material, line density and ground tissue unit layer density are different.

[0064] Table 1 List of control parameters of Examples 2 to 5

[0065]

[0066] Effect experiment:

[0067] The sound absorption coefficients of the above-mentioned sound-absorbing bonded fabrics Z1 to Z5 based on contact electrification of materials by vibration were tested within the test range of 100-5000 Hz, wherein the testing method is as follows:

[0068] According to GB / T 18696.2-2002, fabric sound absorption tests were conducted using an impedance tube. The impedance tube's structure is as follows: a speaker is embedded on one side of the tube, whose frequency and power are controlled by computer software; the other side of the tube is a sample tube, which holds the fabric under test. Two sound pressure sensors are placed between the speaker and the fabric. The measured sound pressure values ​​are used to calculate the fabric's sound absorption coefficient using the transfer function method.

[0069] Test results such as Figure 2 , Figure 2 A is the sound absorption coefficient test results of the sound-absorbing binding fabrics Z1 to Z5 in the test range of 100-5000Hz. Figure 2 B is Figure 2 A partial enlarged view of the shaded area in A shows that the maximum sound absorption coefficient of the sound-absorbing binding fabric Z1 obtained in Example 1 is 0.99, and sound absorption peaks caused by yarn resonance appear at approximately 300 Hz and 450 Hz, with peak values ​​of approximately 0.50 and 0.67, respectively;

[0070] The highest sound absorption coefficient of the sound-absorbing binding fabric Z2 obtained in Example 2 is 0.99. Since the width of the non-warp-threaded area is a single value, the sound absorption peak caused by yarn resonance only appears at about 450 Hz, with a peak value of about 0.63.

[0071] The highest sound absorption coefficient of the sound-absorbing binding fabric Z3 obtained in Example 3 is 0.98. Since the electronegativity of the raw materials of the ground yarn and the middle layer weft yarn is similar, no sound absorption peak appears.

[0072] The maximum sound absorption coefficient of the sound-absorbing joint fabric Z4 obtained in Example 4 is 0.75, and sound absorption peaks appear at about 300 and 450 Hz, with peak values ​​of about 0.165 and 0.199, respectively;

[0073] The highest sound absorption coefficient of the sound-absorbing knitted fabric Z5 obtained in Example 5 is 0.99. Due to the reduction in yarn linear density, the sound absorption peak frequency shifts to high frequencies, with resonance peaks appearing at approximately 315 and 500 Hz, with peak values ​​of approximately 0.70 and 0.94, respectively.

[0074] The above results show that by selecting yarns with specific parameters and categories and adjusting the resonant length of the vibration unit in the relevant parameters of the simply supported beam vibrating string structure, the warp and non-warp areas of the middle fabric layer can have a specific distribution state, which can reduce noise of specific frequencies, thereby expanding the sound absorption frequency range and effectively absorbing low-frequency noise; and by providing an air layer behind the fabric, the overall sound absorption effect can be further improved.

[0075] Examples 6 to 8

[0076] Examples 6 to 8 are respectively a sound-absorbing bonded fabric based on contact electrification of materials by vibration. Their preparation methods are basically the same as that of Example 1, with the only difference being the raw materials and process parameters. See Table 2 for details:

[0077] Table 2 Method parameters of Examples 6 to 8

[0078]

[0079]

[0080] In other embodiments, the conductive fiber or dielectric fiber can also be at least one of a single-component fiber, a fiber with conductive properties obtained by surface processing, and a sheath-core composite fiber whose sheath contains dielectric fiber or conductive fiber. In addition, the sound absorption effect of the present invention can be achieved when the normal threading of the ground tissue unit layer adopts a three-primary tissue or complex change tissue threading method and the rigid wall is a wall or a metal wall.

[0081] The sound-absorbing jointed fabric based on vibration-induced material contact electrification retains the characteristics of the fabric such as lightness, softness, breathability, comfort, and good mechanical properties, and is suitable as a fabric for door curtains, door trims, tarpaulins, or automobile interiors.

[0082] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sound-absorbing binding fabric that causes material contact electrification based on vibration, comprising a ground unit layer composed of ground yarns and an intermediate fabric layer composed of intermediate warp yarns and intermediate weft yarns, wherein the ground yarns include ground warp yarns and ground weft yarns, characterized in that: The ground weave unit layer includes an upper ground weave unit layer and a lower ground weave unit layer formed by normal warp drawing of ground weave yarns; the middle fabric layer is divided into a plurality of alternately drawn-in areas and a plurality of non-drawn-in areas by incomplete warp drawing of middle layer warp yarns and middle layer weft yarns; The middle layer weft yarns in the non-threaded area serve as vibration units that vibrate under the action of sound waves; the middle layer warp yarns and / or the ground tissue warp yarns serve as consolidation units, and the middle fabric layer and the ground tissue unit layer are woven into one by exchanging positions in the threaded area. The two ends of the vibration unit are fixed, and the middle fabric layer is sandwiched between the upper and lower ground tissue unit layers, forming a pore structure for contacting, separating, and electrifying the vibration unit and the ground tissue unit layer. The ground yarn and the vibration unit have different electrostatic sequences.

2. The sound-absorbing binding fabric for electrifying materials by contact based on vibration according to claim 1, characterized in that: The vibration unit and the consolidation units at both ends form a simply supported beam vibrating string structure. The ground tissue unit layer and the middle fabric layer are contacted and separated by the simply supported beam vibrating string structure, generating charge transfer. The simply supported beam vibrating string structure satisfies Where, f jmn is the nth order resonance frequency of the vibration unit, l jm is the resonance length of the vibration unit, δ j is the linear density of the vibration unit.

3. The sound-absorbing binding fabric for electrifying materials by contact based on vibration according to claim 2, characterized in that: The resonance length of the vibration unit is 1-200 mm, and the linear density of the vibration unit is 3-250 tex.

4. The sound-absorbing binding fabric for electrifying materials by contact based on vibration according to claim 2, characterized in that: The normal menstrual passage is to use three original tissues or complex change tissues to pass through the menstrual line; The partial drawing-in means that the warp yarn is only drawn in the drawing-in area, and the non-drawing-in area contains only the middle layer of weft yarn; The width of the non-warp-threaded area in the weft direction is 1-200 mm.

5. The sound-absorbing binding fabric according to any one of claims 1 to 4, wherein: The linear density of the ground yarn is 4-250 tex, and the gram weight of the ground unit layer is 65-1500 g / m 2 The warp density of the ground tissue unit layer and the warp threading area is 200 to 1700 strands / 10cm, and the weft density of the ground tissue unit layer and the warp threading area is 150 to 1200 strands / 10cm.

6. The sound-absorbing binding fabric according to any one of claims 1 to 4, wherein: The raw material for making the ground yarn is conductive fiber or dielectric fiber; the raw material for making the vibration unit is also conductive fiber or dielectric fiber; The conductive fiber or dielectric fiber is at least one of a single component fiber, a fiber with conductive properties obtained by surface processing, and a sheath-core composite fiber whose sheath contains dielectric fiber or conductive fiber.

7. Use of the sound-absorbing binding fabric according to any one of claims 1 to 6, characterized in that: An air layer is formed between the sound-absorbing bonding fabric and the rigid wall for sound absorption; the thickness of the air layer is greater than 0 and less than or equal to 500 mm; the rigid wall includes a wall, a glass wall and a metal wall.

8. The use of the sound-absorbing joint fabric for electrification of materials by contact based on vibration as claimed in claim 7, characterized in that: The thickness of the air layer is Where λ is the wavelength of the sound wave being absorbed.

9. Use of the sound-absorbing binding fabric for electrification of materials by contact based on vibration according to any one of claims 1 to 6, characterized in that: There is no air layer between the sound-absorbing joint fabric and the rigid wall, and the rigid wall includes a wall, a glass wall and a metal wall.

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