A stretchable array flexible fabric pressure sensor and its preparation method and application

Abstract

The present invention discloses a stretchable array flexible fabric pressure sensor, its preparation method, and its application, belonging to the field of sensor technology. The stretchable array flexible fabric pressure sensor provided by the present invention comprises a single-layer pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer. The electrodes include row electrode groups and column electrode groups, which are arranged crosswise and do not contact each other. The stretchable array flexible fabric pressure sensor provided by the present invention has a single-layer structure and is characterized by being lightweight, stable, high-resolution, and adjustable in range. It also has excellent stretchability, fatigue resistance, bending resistance, and breathability. The sensor provided by the present invention also has a simple and low-cost preparation process, which is conducive to actual production.

Description

Technical Field

[0001] The present invention belongs to the field of sensor technology, and in particular relates to a stretchable array flexible fabric pressure sensor and a preparation method and application thereof. Background Art

[0002] In recent years, with the development of artificial intelligence, health monitoring, and human-computer interaction technologies, flexible sensors have broad application prospects, especially flexible textile sensors made from fibers and fabrics. Flexible textile sensors can better conform to the human body than devices based on thin film substrates, and they also have good breathability, flexibility, and bend resistance.

[0003] Prior art resistive flexible textile pressure sensors are primarily classified into two categories: point contact and surface contact. In the patent application CN112095202A, a sensitive fiber with a core-shell structure consisting of a polymer core and a conductive composite skin is interwoven with insulating fibers to form a fabric pressure sensor. The interwoven points serve as sensing points, leading to disadvantages such as poor contact, poor durability, and a low range. In the patent application CN106648275A, a fiber with conductive and non-conductive regions slightly higher than the conductive regions is prepared and woven into a fabric touch sensor. However, this also suffers from poor contact, and the complex and costly preparation process makes mass production difficult. In the patent application CN112393829A, a composite conductive fabric is created by dipping polyester fabric in graphene ink using an impregnation method. The composite conductive fabric is then assembled with upper and lower electrodes to form a fabric pressure sensor. This sensor is a sandwich structure device with surface contact, but the layers are not in close contact, resulting in poor initial structural stability, limited lightness, and poor air permeability. The flexible fabric pressure sensors mentioned above are almost non-stretchable, because stretching will cause damage to the electrode layer or pressure-sensitive layer, resulting in a large change in resistance and affecting the device output signal. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a stretchable array flexible fabric pressure sensor with a simple and stable structure, excellent fatigue resistance, bending resistance, stretchability, and good fit with the human body, as well as its preparation method and application.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a stretchable array flexible fabric pressure sensor, which is composed of a single-layer pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer, and the electrodes include row electrode groups and column electrode groups, and the row electrode groups and column electrode groups are cross-arranged and do not contact each other.

[0006] The stretchable array flexible fabric pressure sensor provided by the present invention consists of a single-layer pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer, and the electrodes of the present invention include row electrode groups and column electrode groups that are cross-arranged and do not contact each other; on the first aspect, the overall structure of the present invention is a single-layer structure, so that the sensor can be light, simple and stable; on the second aspect, the electrodes of the present invention can be arranged in a high density, and the row electrode groups and the column electrode groups will not affect each other. Therefore, the sensor of the present invention has high resolution, high measurement accuracy and adjustable range; on the third aspect, the sensor of the present invention has excellent stretchability and can still work when stretched, and its pressure-sensitive layer and electrodes will not fail; on the fourth aspect, the sensor of the present invention also has excellent fatigue resistance and bending resistance, and good air permeability.

[0007] Specifically, when no pressure is applied, the row electrode group and the column electrode group are in close contact with the pressure-sensitive layer, that is, their output resistance is not infinite; when pressure is applied to the intersection of the row electrode group and the column electrode group, the pressure-sensitive layer will be compressed, so the distance between the intersection of the row electrode group and the column electrode group will become smaller, and its output resistance will become smaller; when the pressure is unloaded, the pressure-sensitive layer returns to its initial state, and the distance between the intersection of the row electrode group and the column electrode group also returns to its initial state, so its output resistance returns to the initial resistance.

[0008] As a preferred embodiment of the stretchable array flexible fabric pressure sensor described in the present invention, the row electrode group includes a plurality of integrated row electrodes 2, and the column electrode group includes a plurality of integrated column electrodes 3; the integrated row electrode 2 is divided into multiple sections of upper row electrodes 21 and lower row electrodes 22, and the upper row electrodes 21 and the lower row electrodes 22 are respectively located on the two sides of the pressure-sensitive layer, and the upper row electrodes 21 and the lower row electrodes 22 are connected end to end; the integrated column electrode 3 is divided into multiple sections of upper column electrodes 31 and lower column electrodes 32, and the upper column electrodes 31 and the lower column electrodes 32 are respectively located on the two sides of the pressure-sensitive layer, and the upper column electrodes 31 and the lower column electrodes 32 are connected end to end; the integrated row electrodes 2 and the integrated column electrodes 3 are arranged vertically and do not contact each other.

[0009] Here, the integrated row electrode 2 is divided into multiple segments of upper row electrodes 21 and lower row electrodes 22, and the integrated column electrode 3 is divided into multiple segments of upper column electrodes 31 and lower column electrodes 32. The upper and lower segments are only used to distinguish the row electrodes or column electrodes on the two sides of the pressure-sensitive layer. Upper and lower do not represent fixed directions. If one side of the fixed pressure-sensitive layer is the upper segment, it means that the other side is the lower segment; vice versa.

[0010] As a preferred embodiment of the stretchable array flexible fabric pressure sensor of the present invention, the pressure-sensitive layer includes a pressure-sensitive fiber 1, which is composed of a non-conductive fiber 11 and a conductive layer 12, and the conductive layer 12 is located on the outer surface of the non-conductive fiber 11.

[0011] As a preferred embodiment of the stretchable array flexible fabric pressure sensor of the present invention, the weight of the pressure-sensitive layer is 70-320 g / m 2 ;The diameter of the pressure-sensitive fiber is 20-500μm.

[0012] As a preferred embodiment of the stretchable array flexible fabric pressure sensor of the present invention, the non-conductive fibers 11 are natural fibers or chemical fibers.

[0013] As a preferred embodiment of the stretchable array flexible fabric pressure sensor described in the present invention, the non-conductive fiber 11 is at least one of cotton fiber, viscose fiber, nylon fiber, and polyester fiber; the material of the conductive layer 12 is selected from at least one of carbon black, graphene, carbon nanotubes, polyaniline, PEDOT / PSS, silver nanoparticles, and copper nanoparticles.

[0014] As a preferred embodiment of the stretchable array flexible fabric pressure sensor of the present invention, the preparation method of the pressure-sensitive fiber 1 is selected from any one of an impregnation method, a coating method and an in-situ growth method.

[0015] Preferably, when the dipping method or coating method is adopted, the dipping or coating can be selected to be performed once or multiple times.

[0016] Preferably, the preparation method of the pressure-sensitive fiber 1 is selected from any one of (c) or (d);

[0017] (c) The non-conductive fiber is pretreated by immersing it in a neutral detergent with a mass concentration of 1.4-1.6 g / L, a bath ratio of 1:(38-42), and a water bath temperature of 55-65°C. After 50-70 minutes, the fiber is taken out, washed, and dried to obtain the pretreated non-conductive fiber. The pretreated non-conductive fiber is then immersed in a conductive ink for 10-20 minutes, taken out, and dried at 75-85°C. The same immersion-drying steps are repeated 2-4 times to obtain a pressure-sensitive fiber. The conductive ink is obtained by mixing water-based polyurethane, carbon black, graphene, and deionized water in a mass ratio of 8:1:1:10 and mechanically stirring at room temperature for 3.5-4.5 hours.

[0018] (d) The non-conductive fiber is pretreated by immersing the non-conductive fiber in a neutral detergent with a mass concentration of 1.4-1.6 g / L, a bath ratio of 1:(38-42), and a water bath temperature of 55-65° C. After 50-70 minutes, the fiber is removed, washed, and dried to obtain the pretreated non-conductive fiber; the pretreated non-conductive fiber is then immersed in an aniline monomer solution with a bath ratio of 1:(28-32) and a temperature of 30-40° C. After soaking for a period of time, the fiber is removed and placed in a reaction solution of 0.02-0.03 g / mL oxidant ammonium persulfate and 0.6-0.8 mol / L hydrochloric acid, uniformly stirred and maintained at 18-22° C., and the fiber is removed after the reaction for 80-100 minutes; finally, the obtained polyaniline composite conductive fiber is washed several times with hydrochloric acid, acetone, and deionized water respectively until the solution has no color, and then dried in an oven at 75-85° C. to obtain a pressure-sensitive fiber.

[0019] As a preferred embodiment of the stretchable array flexible fabric pressure sensor described in the present invention, the preparation method of the pressure-sensitive layer is one of (a) or (b): (a) the pressure-sensitive layer is woven from pressure-sensitive fibers 1 in a loop; (b) the pressure-sensitive layer is formed by impregnating an elastic fabric formed by weaving non-conductive fibers 11 on the outer surface of the non-conductive fibers 11 to form a conductive layer 12.

[0020] Since the pressure-sensitive layer is either woven from pressure-sensitive fibers or formed by impregnation of an elastic fabric that is itself in a woven form, the obtained pressure-sensitive layer has excellent stretchability, and the pressure-sensitive layer and the electrode will not fail when in a stretched state; due to the stretchability, the overall softness of the sensor is better than that of a non-stretchable sensor, and on the basis of being stretchable and having a certain degree of softness, the sensor of the present invention also has a certain degree of bending resistance, and can be folded in half multiple times without damage; in addition, since the sensor has a certain degree of stretchability and softness, its structure has a certain degree of elasticity, so that the recovery performance is better, and it is not easy to be damaged when the range of use exceeds the range, thereby reflecting excellent fatigue resistance.

[0021] As a preferred embodiment of the stretchable array flexible fabric pressure sensor of the present invention, the material of the electrode is selected from any one of silver-plated fiber, stainless steel fiber, and conductive polymer fiber.

[0022] In addition, the present invention also provides a method for preparing the stretchable array flexible fabric pressure sensor, which includes the following steps: weaving the prepared pressure-sensitive fibers into a pressure-sensitive layer, and then sequentially inserting a plurality of integrated row electrodes along the row direction on both sides of the pressure-sensitive layer, and sequentially inserting a plurality of integrated column electrodes along the column direction on both sides of the pressure-sensitive layer, wherein the integrated row electrodes and the integrated column electrodes are arranged vertically and do not contact each other; thereby obtaining a stretchable array flexible fabric pressure sensor.

[0023] In addition, the present invention also provides an application of the stretchable array flexible fabric pressure sensor in the field of intelligent wearable technology.

[0024] Preferably, the stretchable array flexible fabric pressure sensor provided by the present invention can be used as a point sensor or as an array sensor.

[0025] As a preferred embodiment of the application of the present invention, the field of smart wearable technology includes any one of a smart cushion, a smart mattress, a smart shoe, a smart garment, and a smart skin.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The stretchable array flexible fabric pressure sensor provided by the present invention consists of a single-layer pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer, and the electrodes of the present invention include row electrode groups and column electrode groups that are cross-arranged and non-contacting with each other; on the first aspect, the overall structure of the present invention is a single-layer structure, so that the sensor can be light, simple and stable; on the second aspect, the electrodes of the present invention can be arranged in a high density, and the row electrode groups and the column electrode groups will not affect each other. Therefore, the sensor of the present invention has high resolution, high measurement accuracy and adjustable range; on the third aspect, the fabric structure and electrode structure of the pressure-sensitive layer in the sensor of the present invention have excellent stretchability, and thus have good fatigue resistance, bending resistance, air permeability and fit with the human body; on the fourth aspect, the preparation process of the sensor provided by the present invention is simple and low-cost, which is conducive to actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the stretchable array flexible fabric pressure sensor of the present invention;

[0029] Figure 2 Schematic diagram of the structure of the pressure-sensitive fiber of the present invention;

[0030] Figure 3 This is a diagram of the electrical signal generated by the stretchable array flexible fabric pressure sensor of the present invention under pressure;

[0031] Figure 4 This is a diagram of the electrical signal generated by the stretchable array flexible fabric pressure sensor of the present invention under the same cyclic pressure;

[0032] 1-pressure-sensitive fiber, 11-non-conductive fiber, 12-conductive layer, 2-row electrode, 21-upper row electrode, 22-lower row electrode, 3-column electrode, 31-upper column electrode, 32-lower column electrode. DETAILED DESCRIPTION

[0033] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0034] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0035] The structure of the stretchable array flexible fabric pressure sensor provided by the present invention is as follows: Figure 1 As shown, the stretchable array flexible fabric pressure sensor of the present invention is composed of a single pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer. The electrodes include a row electrode group and a column electrode group. The row electrode group and the column electrode group are arranged crosswise and do not contact each other.

[0036] Specifically, the pressure-sensitive layer includes a pressure-sensitive fiber 1. The structural diagram of the pressure-sensitive fiber is as shown in FIG. Figure 2 As shown, the pressure-sensitive fiber 1 is composed of a non-conductive fiber 11 and a conductive layer 12 wrapped around the non-conductive fiber 11, wherein the pressure-sensitive layer can be woven by the pressure-sensitive fiber 1 in a loop manner, or can be formed by impregnating an elastic fabric formed by weaving the non-conductive fiber 11 on the outer surface of the non-conductive fiber to form the conductive layer 12;

[0037] The row electrode group is composed of a plurality of integrated row electrodes 2 (such as Figure 1 As shown in FIG, a plurality of integrated row electrodes 2 are sequentially arranged into the first row, the second row, the third row, the fourth row ... the nth row), and the column electrode group is composed of a plurality of integrated column electrodes 3 (as shown in FIG. Figure 1As shown, a plurality of integrated column electrodes 3 are sequentially arranged into the first column, the second column, the third column ... the nth column); the integrated row electrode 2 is divided into a plurality of upper row electrodes 21 and a lower row electrode 22, the upper row electrodes 21 and the lower row electrodes 22 are respectively located on the two sides of the pressure-sensitive layer, and the upper row electrodes 21 and the lower row electrodes 22 are connected end to end, that is, the upper row electrodes 21 and the lower row electrodes 22 can be regarded as a row unit, the integrated row electrode is composed of a plurality of row units, and the upper row electrodes 21 and the lower row electrodes 22 in the row units are respectively located on the two sides of the pressure-sensitive layer; the integrated column electrode 3 is divided into a plurality of upper column electrodes 31 and a lower column electrode 32, the upper column electrodes 31 and the lower column electrodes 32 are respectively located on the two sides of the pressure-sensitive layer, and the upper row electrodes 21 and the lower row electrodes 22 are connected end to end, that is, the upper row electrodes 21 and the lower row electrodes 22 can be regarded as a row unit, and the integrated row electrode is composed of a plurality of row units, and the upper row electrodes 21 and the lower row electrodes 22 in the row units are respectively located on the two sides of the pressure-sensitive layer; The electrode 31 and the lower column electrode 32 are connected end to end, that is, the upper column electrode 31 and the lower column electrode 32 can be regarded as a column unit, the integrated column electrode is composed of a plurality of column units, and the upper column electrode 31 and the lower column electrode 32 in the column unit are respectively located on the two sides of the pressure-sensitive layer; the integrated row electrode 2 and the integrated column electrode 3 are arranged vertically and do not contact each other, that is, in a row unit in the integrated row electrode, the upper row electrode 21 is located on the first surface of the pressure-sensitive layer, and the lower row electrode 22 is located on the second surface of the pressure-sensitive layer (that is, the opposite side of the first surface of the pressure-sensitive layer), then a lower column electrode of an electrode perpendicular to the upper row electrode is arranged on the second surface, and an upper column electrode of another electrode perpendicular to the lower row electrode is arranged on the first surface; the specific structure is as follows Figure 1 shown.

[0038] When no pressure is applied, the row electrode group and the column electrode group are in close contact with the pressure-sensitive layer, that is, their output resistance is not infinite; when pressure is applied to the intersection of the row electrode group and the column electrode group, the pressure-sensitive layer will be compressed, so the distance between the intersection of the row electrode group and the column electrode group will become smaller, and its output resistance will become smaller; when the pressure is unloaded, the pressure-sensitive layer returns to its initial state, and the distance between the intersection of the row electrode group and the column electrode group also returns to its initial state, so its output resistance returns to the initial resistance.

[0039] Example 1

[0040] An embodiment of the present invention provides a stretchable array flexible fabric pressure sensor. The preparation method of the stretchable array flexible fabric pressure sensor is as follows:

[0041] (1) Preparation of pressure-sensitive fiber: 70D nylon fiber was pretreated by immersing it in a neutral detergent with a mass concentration of 1.5 g / L, a bath ratio of 1:40, and a water bath temperature of 60°C. After 1 hour, the fiber was taken out and washed several times, and then placed in an oven for drying to obtain the pretreated 70D nylon fiber; water-based polyurethane, carbon black, graphene and deionized water were mixed in a mass ratio of 8:1:1:10 and mechanically stirred at room temperature for 4 hours to obtain a conductive ink; the pretreated 70D nylon fiber was immersed in the prepared conductive ink for 15 minutes, taken out and dried at 80°C, and the second and third immersion coatings were performed according to the same steps to obtain a pressure-sensitive fiber; the diameter of the pressure-sensitive fiber was about 100 μm;

[0042] (2) Preparation of pressure-sensitive layer: The pressure-sensitive fibers are woven into a conductive fabric to obtain a pressure-sensitive layer; the weight of the pressure-sensitive layer is about 230 g / m 2 ;

[0043] (3) Preparation of electrodes: elastic silver-plated fibers with a skin-core structure were prepared using conductive silver-plated fibers as the skin and spandex fibers as the core to obtain electrodes;

[0044] (4) Fixing the upper and lower surfaces and the row and column directions of the pressure-sensitive layer, the silver-plated fibers are first arranged in an up-and-down cycle along the row direction of the pressure-sensitive layer, and then arranged in an up-and-down cycle along the column direction of the pressure-sensitive layer, wherein one silver-plated fiber is arranged on the upper surface in the row direction, and the other silver-plated fiber is arranged on the lower surface in the column direction at the same position of the pressure-sensitive layer; thus, a stretchable array flexible fabric pressure sensor is obtained.

[0045] Example 2

[0046] An embodiment of the present invention provides a stretchable array flexible fabric pressure sensor. The preparation method of the stretchable array flexible fabric pressure sensor is as follows:

[0047] (1) Preparation of pressure-sensitive fiber: The nylon fiber was pretreated by immersing it in a neutral detergent with a mass concentration of 1.5 g / L, a bath ratio of 1:40, and a water bath temperature of 60°C. After 1 hour, the fiber was taken out and washed several times, and then placed in an oven for drying. Then, it was immersed in an aniline monomer solution with a bath ratio of 1:30 and a temperature of 35°C. After soaking for a certain period of time, it was taken out and finally placed in a 0.025 g / mL oxidant ammonium persulfate and 0.7 mol / L hydrochloric acid reaction solution, stirred evenly and maintained at 20°C. After reacting for 90 minutes, the fiber was taken out. Finally, the obtained polyaniline composite conductive fiber was washed several times with hydrochloric acid, acetone and deionized water respectively until the solution had no color, and then dried in an oven at 80°C to obtain a pressure-sensitive fiber. The diameter of the pressure-sensitive fiber was about 105 μm.

[0048] (2) Preparation of pressure-sensitive layer: The pressure-sensitive fibers are woven into a conductive fabric to obtain a pressure-sensitive layer; the weight of the pressure-sensitive layer is approximately 255 g / m 2 ;

[0049] (3) Preparation of electrodes: An elastic conductive fiber with a skin-core structure was prepared using conductive stainless steel fiber as the skin and spandex fiber as the core to obtain an electrode;

[0050] (4) Fixing the upper and lower surfaces and the row and column directions of the pressure-sensitive layer, the conductive fibers are first arranged in an up-down cycle along the row direction of the pressure-sensitive layer, and then arranged in an up-down cycle along the column direction of the pressure-sensitive layer, wherein one conductive fiber is arranged on the upper surface in the row direction, and the other conductive fiber is arranged on the lower surface in the column direction at the same position of the pressure-sensitive layer; thus, a stretchable array flexible fabric pressure sensor is obtained.

[0051] Example 3

[0052] An embodiment of the present invention provides a stretchable array flexible fabric pressure sensor. The preparation method of the stretchable array flexible fabric pressure sensor is as follows:

[0053] (1) Preparation of pressure-sensitive layer: The nylon elastic fabric is pretreated by immersing it in a neutral detergent with a mass concentration of 1.5 g / L, a bath ratio of 1:40, and a water bath temperature of 60°C. After 1 hour, the fiber is taken out and, after multiple washings, placed in an oven for drying. Then, it is immersed in an aniline monomer solution with a bath ratio of 1:30 and a temperature of 35°C. After soaking for a certain period of time, it is taken out and finally placed in a 0.025 g / mL oxidant ammonium persulfate and 0.7 mol / L hydrochloric acid reaction solution. It is stirred evenly and maintained at 20°C. After reacting for 90 minutes, the fabric is taken out. Finally, the obtained polyaniline composite conductive fabric is washed several times with hydrochloric acid, acetone, and deionized water respectively until the solution has no color, and then dried in an oven at 80°C to obtain a pressure-sensitive layer; the weight of the pressure-sensitive layer is about 265 g / m 2 ;

[0054] (2) Preparation of electrodes: elastic silver-plated fibers with a skin-core structure were prepared using conductive silver-plated fibers as the skin and spandex fibers as the core to obtain electrodes;

[0055] (3) Fixing the upper and lower surfaces and the row and column directions of the pressure-sensitive layer, the silver-plated fibers are first arranged in an up-and-down cycle along the row direction of the pressure-sensitive layer, and then arranged in an up-and-down cycle along the column direction of the pressure-sensitive layer, wherein one silver-plated fiber is arranged on the upper surface in the row direction, and the other silver-plated fiber is arranged on the lower surface in the column direction at the same position of the pressure-sensitive layer; thus, a stretchable array flexible fabric pressure sensor is obtained.

[0056] Effect Examples

[0057] The electrical signal graphs generated by the stretchable array flexible fabric pressure sensor prepared in Example 1 of the present invention under pressure and the electrical signal graphs generated under the same cyclic pressure were recorded. The test instrument was an electronic universal testing machine with an loading and unloading speed of 5 mm / min. The results were as follows: Figure 3 、 Figure 4 shown; from Figure 3 and Figure 4 It can be seen from the figure that the stretchable array flexible fabric pressure sensor of the present invention has good linearity and fatigue resistance.

[0058] Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A stretchable array flexible fabric pressure sensor, characterized in that: The stretchable array flexible fabric pressure sensor is composed of a single pressure-sensitive layer and electrodes interspersed on both sides of the pressure-sensitive layer. The electrodes include a row electrode group and a column electrode group. The row electrode group and the column electrode group are arranged crosswise and do not contact each other. The row electrode group includes a plurality of integrated row electrodes (2), and the column electrode group includes a plurality of integrated column electrodes (3); The integrated row electrode (2) is divided into multiple sections of upper row electrodes (21) and lower row electrodes (22), the upper row electrodes (21) and the lower row electrodes (22) are respectively located on two sides of the pressure-sensitive layer, and the upper row electrodes (21) and the lower row electrodes (22) are connected end to end; The integrated column electrode (3) is divided into multiple sections of upper column electrodes (31) and lower column electrodes (32), the upper column electrodes (31) and the lower column electrodes (32) are respectively located on two sides of the pressure-sensitive layer, and the upper column electrodes (31) and the lower column electrodes (32) are connected end to end; The integrated row electrodes (2) and the integrated column electrodes (3) are arranged vertically and do not contact each other; The pressure-sensitive layer comprises a pressure-sensitive fiber (1), wherein the pressure-sensitive fiber (1) is composed of a non-conductive fiber (11) and a conductive layer (12), wherein the conductive layer (12) is located on the outer surface of the non-conductive fiber (11); The weight of the pressure-sensitive layer is 70-320 g / m 2 ;The diameter of the pressure-sensitive fiber is 20-500μm; The material of the electrode is selected from any one of silver-plated fiber, stainless steel fiber, and conductive polymer fiber; the electrode is prepared by preparing an elastic conductive fiber with a skin-core structure using conductive silver-plated fiber or conductive stainless steel fiber as the skin and spandex fiber as the core; The preparation method of the pressure-sensitive fiber (1) is selected from any one of an impregnation method, a coating method and an in-situ growth method; The non-conductive fiber (11) is nylon fiber; The preparation method of the pressure-sensitive layer comprises the following steps: 1) Preparation of pressure-sensitive fiber: 70D nylon fiber was pretreated by immersing it in a neutral detergent at a concentration of 1.5 g / L, a bath ratio of 1:40, and a water bath temperature of 60°C. After 1 hour, the fiber was removed, washed multiple times, and then dried in an oven to obtain the pretreated 70D nylon fiber. A conductive ink was obtained by mixing water-based polyurethane, carbon black, graphene, and deionized water in a mass ratio of 8:1:1:10 and mechanically stirring at room temperature for 4 hours. The pretreated 70D nylon fiber was immersed in the prepared conductive ink for 15 minutes, taken out and dried at 80°C, and the same steps were followed for the second and third dipping and coating to obtain a pressure-sensitive fiber with a diameter of 100 μm. 2) Preparation of pressure-sensitive layer: The pressure-sensitive fibers are woven into a conductive fabric to obtain a pressure-sensitive layer; the weight of the pressure-sensitive layer is 230 g / m 2 .

2. The stretchable array flexible fabric pressure sensor according to claim 1, characterized in that: The non-conductive fibers (11) are natural fibers or chemical fibers.

3. The stretchable array flexible fabric pressure sensor according to claim 2, characterized in that: The material of the conductive layer (12) is selected from at least one of carbon black, graphene, carbon nanotubes, polyaniline, PEDOT / PSS, silver nanoparticles, and copper nanoparticles.

4. The stretchable array flexible fabric pressure sensor according to claim 1, characterized in that: The preparation method of the pressure-sensitive layer is selected from any one of (a) or (b): (a) The pressure-sensitive layer is formed by weaving the pressure-sensitive fiber (1) in a loop; (b) The pressure-sensitive layer is formed by impregnating an elastic fabric formed by weaving non-conductive fibers (11) onto the outer surface of the non-conductive fibers (11) to form a conductive layer (12).

5. The method for preparing a stretchable array flexible fabric pressure sensor according to any one of claims 1 to 4, wherein: The preparation method includes the following steps: inserting a plurality of integrated row electrodes in sequence along the row direction on both sides of the pressure-sensitive layer, and inserting a plurality of integrated column electrodes in sequence along the column direction on both sides of the pressure-sensitive layer, wherein the integrated row electrodes and the integrated column electrodes are arranged vertically and do not contact each other; and obtaining a stretchable array flexible fabric pressure sensor.

6. Application of the stretchable array flexible fabric pressure sensor according to any one of claims 1 to 4 in the field of smart wearable technology.

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