Flexible stretchable dry electrode, preparation method thereof and bioelectricity monitoring equipment

Abstract

The invention discloses a flexible stretchable dry electrode, a preparation method thereof and bioelectricity monitoring equipment. The flexible stretchable dry electrode comprises a flexible substrate; the flexible electrode layer is arranged on at least part of the surface of the flexible substrate, and the flexible electrode layer comprises 30 parts by weight to 60 parts by weight of flaky silver powder, 5 parts by weight to 13 parts by weight of silver chloride particles and 10 parts by weight to 20 parts by weight of macromolecular resin; and one side, far away from the flexible substrate, of the flexible electrode layer is provided with a plurality of bulge structures. The flexible stretchable dry electrode is simple in structure, the preparation process of the flexible stretchable dry electrode does not need any mold assistance, the attaching capacity of the dry electrode and the skin is effectively enhanced, and noise interference is reduced. Besides, the flexibility and the stretch-proof performance of the dry electrode are effectively improved, the dry electrode can still collect and transmit bio-electricity signals under the action of a certain stretching and bending load, and therefore the dry electrode can better adapt to the deformation state of human skin.

Description

Technical Field

[0001] The present application relates to the field of bioelectric monitoring electrodes. Specifically, the present application relates to a flexible and stretchable dry electrode, a preparation method thereof, and a bioelectric monitoring device. Background Art

[0002] Electrodes are conductors used to obtain various bioelectric signals in the human body. According to their mode of action, they can be divided into wet electrodes and dry electrodes. Among them, dry electrodes are in direct contact with the skin, and there is no conductive medium between them. Long-term wearing / wearing will not cause skin irritation, and they have good wearing comfort. They have great research potential in the field of wearable health monitoring.

[0003] However, the disadvantage of dry electrodes is that they have poor adhesion to the skin. To solve this problem, researchers have proposed a three-dimensional structure electrode solution, that is, to set a microstructure on the surface of the electrode, making it into a microneedle or protrusion shape, so as to increase the contact between the electrode and the skin, reduce the skin contact impedance, and obtain a more stable ECG signal. Common three-dimensional structure electrodes are generally prepared by the template method. The preparation process is complicated. The template must be prepared first, and then the prepared solution is poured into the prepared template and dried to form an electrode matrix with a three-dimensional microstructure. The prepared electrode contains a five-layer structure with a complex structure and is not resistant to stretching. In addition, some electrodes in the prior art contain a filling layer, and the overall size is large. Although they have a certain degree of flexibility, they are not resistant to stretching. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the purpose of the present application is to propose a flexible stretchable dry electrode, a preparation method thereof, and a bioelectric monitoring device. The flexible stretchable dry electrode of the present application has a simple structure, and its preparation process does not require any mold assistance, which effectively enhances the ability of the dry electrode to fit the skin and reduces noise interference. In addition, the present application effectively improves the flexibility and tensile resistance of the dry electrode, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin.

[0005] In a first aspect of the present application, a flexible stretchable dry electrode is provided. According to an embodiment of the present application, the flexible stretchable dry electrode comprises:

[0006] Flexible substrate;

[0007] A flexible electrode layer, wherein the flexible electrode layer is disposed on at least a portion of the surface of the flexible substrate, and the flexible electrode layer comprises 30 to 60 parts by weight of flaky silver powder, 5 to 13 parts by weight of silver chloride particles, and 10 to 20 parts by weight of a polymer resin;

[0008] And the side of the flexible electrode layer away from the flexible substrate has a plurality of protrusion structures.

[0009] According to the flexible stretchable dry electrode of the above embodiment of the present application, the flexible electrode layer of the present application includes flaky silver powder, silver chloride particles and polymer resin, and the above materials can be directly stacked on the electrode surface to form a three-dimensional protruding structure, and the preparation process does not require any mold assistance. Therefore, the flexible stretchable dry electrode of the present application has a simple structure, only including a flexible substrate and a flexible electrode layer, and the flexible electrode layer has multiple protruding structures on the side away from the flexible substrate, thereby effectively enhancing the dry electrode's ability to fit the skin and reducing noise interference. In addition, the flexible electrode layer of the present application includes 30 to 60 parts by weight of flaky silver powder, and adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0010] In addition, the flexible stretchable dry electrode according to the above embodiment of the present application may also have the following additional technical features:

[0011] In some embodiments of the present application, the aspect ratio of the flaky silver powder is 50-200.

[0012] In some embodiments of the present application, the average particle size of the flaky silver powder is 5 μm to 50 μm; and / or the average particle size of the silver chloride particles is 0.1 μm to 5 μm.

[0013] In some embodiments of the present application, the average height of the protrusion structure is 10 μm to 100 μm.

[0014] In some embodiments of the present application, the flexible electrode layer includes a flexible electrode base layer, the protruding structure is arranged on a side of the flexible electrode base layer away from the flexible substrate, the thickness of the flexible electrode base layer is 5 μm to 25 μm; and / or the thickness of the flexible substrate is 0.05 mm to 0.5 mm.

[0015] In some embodiments of the present application, the flexible substrate includes at least one of thermoplastic polyurethane elastomer rubber, polyethylene, polyethylene terephthalate and polyimide; and / or the polymer resin includes at least one of polyvinyl butyral resin, epoxy resin, polyurethane resin, silicone resin and acrylic resin.

[0016] In some embodiments of the present application, the flexible electrode layer further comprises 1 to 3 parts by weight of an auxiliary agent, wherein the auxiliary agent comprises at least one of a thixotropic agent, a diluent, a leveling agent, a dispersant and a coupling agent.

[0017] In a second aspect of the present application, a method for preparing a flexible stretchable dry electrode is provided. According to an embodiment of the present application, the method comprises:

[0018] (1) mixing a polymer resin, an optional auxiliary agent and a solvent, and heating them to form an organic carrier;

[0019] (2) mixing flaky silver powder, silver chloride particles and the organic carrier to form a slurry;

[0020] (3) Printing the slurry on a flexible substrate and drying it to form a flexible stretchable dry electrode.

[0021] According to the method for preparing a flexible stretchable dry electrode of the above embodiment of the present application, by mixing flaky silver powder and granular silver chloride powder in an organic carrier, a silver / silver chloride paste is prepared, and a flexible electrode layer with a convex structure can be directly stacked on the surface of a flexible substrate by screen printing or inkjet printing. The preparation process does not require any mold assistance, the preparation method is simple, and it is easy to industrialize and mass produce. At the same time, the flexible stretchable dry electrode formed by the method has a simple structure, only including a flexible substrate and a flexible electrode layer, and the side of the flexible electrode layer away from the flexible substrate has multiple convex structures, thereby effectively enhancing the dry electrode's ability to fit the skin and reducing noise interference. In addition, the flexible electrode layer formed by the method includes 30 to 60 parts by weight of flaky silver powder, and adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0022] In some embodiments of the present application, in step (1), heating is performed to 60° C. to 90° C.; and / or, in step (1), the solvent comprises at least one of divalent acid ester, isophorone, diethylene glycol monobutyl ether, diethylene glycol ethyl ether and diethylene glycol butyl ether; and / or, in step (2), the flaky silver powder is added to the organic carrier and stirred for 20 min to 40 min; then the silver chloride particles are added to the organic carrier and stirred for 10 min to 30 min to form the slurry; and / or, in step (3), the slurry is printed on the flexible substrate by screen printing or inkjet printing.

[0023] In the third aspect of the present application, a bioelectric monitoring device is proposed. According to an embodiment of the present application, the bioelectric monitoring device has a flexible and stretchable dry electrode of the above embodiment. As a result, the skin-fitting ability of the dry electrode of the bioelectric monitoring device is improved, and noise interference is reduced; at the same time, the flexibility and tensile resistance of the dry electrode are improved, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic structural diagram of a flexible stretchable dry electrode according to some embodiments of the present application;

[0027] Figure 2 This is a SEM electron microscope image of flaky silver powder;

[0028] Figure 3 This is a cross-sectional electron micrograph of the flexible stretchable dry electrode prepared in Example 1;

[0029] Figure 4 This is a top view of the flexible stretchable dry electrode prepared in Example 1.

[0030] Reference numerals:

[0031] 100 - flexible substrate, 200 - flexible electrode layer, 201 - flexible electrode base layer, 202 - protrusion structure. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the first aspect of the present application, a flexible stretchable dry electrode is provided. According to an embodiment of the present application, referring to the attached Figure 1The flexible stretchable dry electrode includes: a flexible substrate 100; a flexible electrode layer 200, wherein the flexible electrode layer 200 is arranged on at least a portion of the surface of the flexible substrate 100, and the flexible electrode layer 200 includes 30 to 60 parts by weight of flaky silver powder, 5 to 13 parts by weight of silver chloride particles, and 10 to 20 parts by weight of a polymer resin; and the flexible electrode layer 200 has a plurality of protrusion structures 202 on a side away from the flexible substrate 100.

[0038] The beneficial effects that can be achieved by the flexible stretchable dry electrode proposed in this application are described in detail below:

[0039] The flexible electrode layer of the present application includes flaky silver powder, silver chloride particles and polymer resin. The above materials can be directly stacked on the electrode surface to form a three-dimensional protruding structure. The preparation process does not require any mold assistance. Therefore, the flexible and stretchable dry electrode structure of the present application is simple, including only a flexible substrate and a flexible electrode layer, and the flexible electrode layer has multiple protruding structures on the side away from the flexible substrate, thereby effectively enhancing the dry electrode's ability to fit the skin and reducing noise interference. In addition, the flexible electrode layer of the present application includes 30 to 60 parts by weight of flaky silver powder, and adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0040] It should be noted that the dry electrode in the related art generally requires the assistance of a mold to form a three-dimensional raised structure, which leads to a complex structure of the dry electrode; while the flexible electrode layer of the present application includes flaky silver powder, silver chloride particles and polymer resin. The above materials can be directly stacked on the electrode surface to form a three-dimensional raised structure, and the three-dimensional raised structure can be formed without any mold assistance during the preparation process.

[0041] In addition, the flexible electrode layer of the present application includes 30 to 60 parts by weight of flaky silver powder, 5 to 13 parts by weight of silver chloride particles, and 10 to 20 parts by weight of polymer resin. Only by limiting the content of each component within the above range can a plurality of protrusion structures be effectively formed on the side of the flexible electrode layer away from the flexible substrate, while ensuring that adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode. The inventors found that if the content of flaky silver powder is too high or too low, the content of silver chloride particles is too high or too low, and the content of polymer resin is too high or too low, the technical effect of the present application cannot be achieved.

[0042] According to some specific embodiments of the present application, the diameter-to-thickness ratio of the above-mentioned flaky silver powder (the diameter-to-thickness ratio refers to the ratio of the particle size of the flaky silver powder to the thickness of the flaky layer) is 50 to 200. Therefore, by limiting the diameter-to-thickness ratio of the flaky silver powder within the above-mentioned range, it can be effectively ensured that a plurality of protruding structures are formed on the side of the flexible electrode layer away from the flexible substrate, and at the same time, it can be effectively ensured that adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode. Figure 2 It is the SEM electron microscope picture of the above-mentioned flaky silver powder.

[0043] According to some further specific embodiments of the present application, the average particle size of the flaky silver powder is 5 μm to 50 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc., thereby further ensuring that a plurality of protruding structures are formed on the side of the flexible electrode layer away from the flexible substrate, and further ensuring that adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode.

[0044] According to some other specific embodiments of the present application, the average particle size of the silver chloride particles is 0.1 μm to 5 μm, for example, 0.1 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc., thereby further ensuring that the dry electrode has an excellent ability to collect and transmit bioelectric signals.

[0045] According to some other specific embodiments of the present application, the average height of the raised structure is 10 μm to 100 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., thereby further ensuring the ability of the dry electrode to fit the skin and reducing noise interference.

[0046] According to some other specific embodiments of the present application, refer to the attached Figure 1 The flexible electrode layer 200 includes a flexible electrode base layer 201, and the protruding structure 202 is arranged on the side of the flexible electrode base layer 201 away from the flexible substrate 100. The thickness of the flexible electrode base layer 201 is 5μm to 25μm, for example, it can be 5μm, 10μm, 15μm, 20μm, 25μm, etc., thereby further ensuring that the dry electrode has an excellent ability to collect and transmit bioelectric signals.

[0047] According to some further specific embodiments of the present application, the thickness of the flexible substrate is 0.05 mm to 0.5 mm, for example, it may be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0048] In the embodiments of the present application, the material of the above-mentioned flexible substrate is not particularly limited, and those skilled in the art can select it according to actual needs. As some preferred embodiments, the material of the flexible substrate includes at least one of thermoplastic polyurethane elastomer rubber (TPU), polyethylene (PE), polyethylene terephthalate (PET) and polyimide (PI). The above-mentioned materials have good elasticity, high tensile strength and strong toughness, which are further beneficial to ensure the flexibility and tensile resistance of the dry electrode.

[0049] In the embodiments of the present application, the specific types of the polymer resins are not particularly limited, and those skilled in the art can select them according to actual needs. As some preferred embodiments, the polymer resins include at least one of polyvinyl butyral resin, epoxy resin, polyurethane resin, silicone resin and acrylic resin. The polymer resins of the above types can further help ensure the flexibility and tensile resistance of the flexible electrode layer, further ensure the adhesion of the flexible electrode layer to the skin, and reduce noise interference.

[0050] According to some further specific embodiments of the present application, the flexible electrode layer further comprises 1 to 3 parts by weight of an auxiliary agent, wherein the auxiliary agent comprises at least one of a thixotropic agent, a diluent, a leveling agent, a dispersant and a coupling agent.

[0051] In the embodiments of the present application, the specific types of the above-mentioned thixotropic agent are not particularly limited. As some specific examples, the thixotropic agent includes fumed silica, bentonite, organic bentonite, etc. The specific types of the above-mentioned leveling agent are not particularly limited. As some specific examples, the leveling agent includes polydimethylsiloxane, propylene glycol, ethylene glycol, etc. The specific types of the above-mentioned dispersant are not particularly limited. As some specific examples, the dispersant includes phosphates, polycarboxylates, polyacrylates, etc. The specific types of the above-mentioned coupling agent are not particularly limited. As some specific examples, the coupling agent includes silane coupling agent, etc. The specific types of the above-mentioned diluent are not particularly limited. As some specific examples, the diluent includes dibasic acid ester (DBE), etc.

[0052] In a second aspect of the present application, a method for preparing the above-mentioned flexible stretchable dry electrode is proposed. According to an embodiment of the present application, the method comprises:

[0053] S100: mixing a polymer resin, an optional auxiliary agent and a solvent, and heating to form an organic carrier;

[0054] In this step, a polymer resin, an optional auxiliary agent and a solvent are mixed, heated, and stirred to a homogeneous phase to form an organic carrier.

[0055] According to some specific embodiments of the present application, the temperature is heated to 60°C to 90°C, for example, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, etc., thereby effectively mixing and stirring the polymer resin, optional additives and solvent to a homogeneous phase.

[0056] According to some further specific embodiments of the present application, the usage of the above-mentioned solvent is 40 parts by weight to 60 parts by weight.

[0057] In the embodiments of the present application, the specific types of the above-mentioned solvents are not particularly limited. As some specific examples, the solvents include at least one of divalent esters, isophorone, diethylene glycol monobutyl ether, diethylene glycol ethyl ether and diethylene glycol butyl ether. The above-mentioned types of solvents can further ensure that the polymer resin and the optional auxiliary agents form an organic carrier.

[0058] S200: mixing flaky silver powder, silver chloride particles and an organic carrier to form a slurry;

[0059] In this step, the flaky silver powder, silver chloride particles and an organic vehicle are mixed, stirred, and evenly dispersed to form a slurry.

[0060] According to some further specific embodiments of the present application, flaky silver powder is added to an organic carrier and stirred for 20 to 40 minutes (as an example, it may be 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, etc.), and then silver chloride particles are added to the organic carrier and stirred for 10 to 30 minutes (as an example, it may be 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc.), thereby ensuring that the flaky silver powder and the silver chloride particles are evenly mixed in the organic carrier to form a slurry.

[0061] S300: Printing the slurry on a flexible substrate and drying it to form a flexible and stretchable dry electrode.

[0062] In this step, the slurry can be printed on a flexible substrate by screen printing or inkjet printing, dried, and a flexible electrode layer is formed on the surface of the flexible substrate to obtain a flexible stretchable dry electrode. Printing the slurry on a flexible substrate by screen printing or inkjet printing can continuously prepare a flexible stretchable dry electrode with a three-dimensional protruding structure on the surface.

[0063] As some specific embodiments, the slurry can be printed on the flexible substrate using a 150-240 mesh screen printing screen. As some further specific embodiments, the flexible electrode layer is preferably circular, with a diameter of 5 mm to 25 mm, and a wet thickness (referring to the thickness of the flexible electrode layer before drying) of 8 μm to 50 μm.

[0064] As some further specific embodiments, the printed flexible electrode may be placed in an oven at 90° C. to 120° C. to dry for 10 min to 30 min.

[0065] According to some further specific embodiments of the present application, before printing the slurry on the flexible substrate, the method further includes:

[0066] The slurry was filtered using a 250-mesh screen to obtain a printable slurry.

[0067] According to the method for preparing a flexible stretchable dry electrode of the above embodiment of the present application, by mixing flaky silver powder and granular silver chloride powder in an organic carrier, a silver / silver chloride paste is prepared, and a flexible electrode layer with a convex structure can be directly stacked on the surface of a flexible substrate by screen printing or inkjet printing. The preparation process does not require any mold assistance, the preparation method is simple, and it is easy to industrialize and mass produce. At the same time, the flexible stretchable dry electrode formed by the method has a simple structure, only including a flexible substrate and a flexible electrode layer, and the side of the flexible electrode layer away from the flexible substrate has multiple convex structures, thereby effectively enhancing the dry electrode's ability to fit the skin and reducing noise interference. In addition, the flexible electrode layer formed by the method includes 30 to 60 parts by weight of flaky silver powder, and adjacent flaky silver powders are stacked on each other, thereby effectively improving the flexibility and tensile resistance of the dry electrode, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0068] In the third aspect of the present application, a bioelectric monitoring device is proposed. According to an embodiment of the present application, the bioelectric monitoring device has a flexible and stretchable dry electrode of the above embodiment. As a result, the skin-fitting ability of the dry electrode of the bioelectric monitoring device is improved, and noise interference is reduced; at the same time, the flexibility and tensile resistance of the dry electrode are improved, so that the dry electrode can still collect and transmit bioelectric signals under a certain tensile bending load, so that the dry electrode can better adapt to the deformation state of human skin and ensure the signal quality during dynamic monitoring.

[0069] Specifically, bioelectric monitoring equipment includes electrocardiogram monitoring equipment, muscle monitoring equipment, etc.

[0070] The embodiments of the present application are described in detail below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. In addition, unless otherwise explicitly stated, all reagents used in the following embodiments are commercially available or can be synthesized according to this article or known methods, and the reaction conditions not listed are also easily available to those skilled in the art.

[0071] Example 1

[0072] This embodiment provides a flexible stretchable dry electrode, and the preparation method thereof is as follows:

[0073] 1) Weigh 6 g of polyurethane resin and 4 g of epoxy resin, add them to 70 g of DBE solvent, heat to 70° C. after fully swelling, then add 1.5 g of silane coupling agent, 0.5 g of fumed silica thixotropic agent, and 0.1 g of polydimethylsiloxane leveling agent, stir evenly, and prepare an organic carrier.

[0074] 2) Weigh 40 g of flaky silver powder (diameter-to-thickness ratio of 170-180) and add it to the above organic vehicle, stir for 40 min, then add 8 g of silver chloride powder, continue stirring for 20 min, and prepare a crude silver / silver chloride slurry.

[0075] 3) Filter the above materials using a 250-mesh screen to obtain the desired silver / silver chloride slurry.

[0076] 4) Take silver / silver chloride paste and use screen printing equipment (200 mesh screen printing screen) to print a flexible electrode layer on a TPU substrate with a thickness of 0.2 mm. The electrode diameter is 15 mm, and a flexible stretchable dry electrode with a three-dimensional protrusion structure on the surface is obtained.

[0077] Example 2

[0078] This embodiment provides a flexible stretchable dry electrode, and the preparation method thereof is as follows:

[0079] 1) Weigh 6 g of polyurethane resin and 4 g of epoxy resin, add them to 60 g of DBE solvent, heat to 70° C. after fully swelling, then add 1.2 g of silane coupling agent, 0.4 g of fumed silica thixotropic agent and 0.1 g of polydimethylsiloxane leveling agent, stir evenly, and prepare an organic carrier.

[0080] 2) Weigh 45 g of flaky silver powder (diameter-to-thickness ratio of 170-180) and add it to the above organic vehicle, stir for 35 min, then add 10 g of silver chloride powder, continue stirring for 25 min, and prepare a crude silver / silver chloride slurry.

[0081] 3) Filter the above materials using a 250-mesh screen to obtain the desired silver / silver chloride slurry.

[0082] 4) Take silver / silver chloride paste and use screen printing equipment (200 mesh screen printing screen) to print a flexible electrode layer on a PE substrate with a thickness of 0.3 mm. The electrode diameter is 15 mm, and a flexible stretchable dry electrode with a three-dimensional protrusion structure on the surface is obtained.

[0083] Example 3

[0084] This embodiment provides a flexible stretchable dry electrode, and the preparation method thereof is as follows:

[0085] 1) Weigh 6 g of polyurethane resin and 4 g of epoxy resin, add them to 60 g of DBE solvent, heat to 70° C. after fully swelling, then add 1.8 g of silane coupling agent and 0.6 g of fumed silica thixotropic agent, stir evenly, and prepare an organic carrier.

[0086] 2) Weigh 50 g of flaky silver powder (diameter-to-thickness ratio of 170-180) and add it to the above organic vehicle, stir for 30 min, then add 12 g of silver chloride powder, and continue stirring for 30 min to obtain a crude silver / silver chloride slurry.

[0087] 3) Filter the above materials using a 250-mesh screen to obtain the desired silver / silver chloride slurry.

[0088] 4) Take silver / silver chloride paste and use screen printing equipment (200 mesh screen printing screen) to print a flexible electrode layer on a PET substrate with a thickness of 0.4 mm. The electrode diameter is 15 mm, and a flexible stretchable dry electrode with a three-dimensional protrusion structure on the surface is obtained.

[0089] Example 4

[0090] This embodiment provides a flexible stretchable dry electrode. The difference between this embodiment and embodiment 1 is that:

[0091] The diameter-to-thickness ratio of the flaky silver powder is 100-110.

[0092] Example 5

[0093] This embodiment provides a flexible stretchable dry electrode. The difference between this embodiment and embodiment 1 is that:

[0094] The diameter-to-thickness ratio of the flaky silver powder is 50-60.

[0095] Comparative Example 1

[0096] This comparative example provides a flexible stretchable dry electrode. The difference between this comparative example and Example 1 is that:

[0097] The diameter-to-thickness ratio of the flaky silver powder is 20-30.

[0098] The flexible stretchable dry electrodes of Examples 1 to 5 and Comparative Example 1 were respectively taken, and the printed surface was observed using a microscope. The cross-sectional images of the samples were taken using a scanning electron microscope, and the average height of the protruding structures on the surface of the flexible electrode layer was counted. The results are shown in Table 1.

[0099] Attached Figure 3 This is a cross-sectional electron micrograph of the flexible stretchable dry electrode prepared in Example 1. Figure 4 is a top view of the flexible stretchable dry electrode prepared in Example 1. Figure 3 and 4It can be seen that a protruding structure is formed on the surface of the flexible electrode layer prepared in Example 1.

[0100] The stretch resistance of the flexible stretchable dry electrodes of Examples 1 to 5 and Comparative Example 1 was tested respectively, and the test method was as follows:

[0101] 1) Cut a long strip sample with a width of 15 mm and a length of 200 mm and printed with a flexible stretchable dry electrode part. The strip must contain a circuit along the stretching direction (the length is not less than 20 mm). Use a four-probe square resistance tester to test the circuit square resistance, which is recorded as R0;

[0102] 2) Place the sample in the two fixtures of the microcomputer-controlled electronic universal testing machine so that the longitudinal axis of the sample coincides with the center line of the upper and lower fixtures. The sample should be flattened without wrinkles and not bear load;

[0103] 3) Start the testing machine, set the stretching distance to 10% of the length of the sample in the middle of the fixture, return to the initial position after reaching the maximum position, and repeat the second stretching;

[0104] 4) When the stretching is repeated for the 100th time, the clamp stays at the maximum position and remains stationary;

[0105] 5) Place a back plate on the back of the sample, make sure the back plate fits the sample and does not cause the sample to bear load, and fix the back plate;

[0106] 6) Use a four-probe square resistance tester to test the square resistance of the circuit in the stretched sample, recorded as R;

[0107] 7) Calculate the R / R0 ratio to measure the tensile resistance of the sample. The larger the R / R0 ratio, the greater the line resistance of the sample after stretching, which will affect the transmission of the signal, that is, the worse the tensile resistance.

[0108] The test results are shown in Table 1.

[0109] Table 1

[0110]

[0111] It can be seen from Table 1 that the surfaces of the flexible electrode layers in Examples 1 to 5 are all formed with protruding structures, which can effectively enhance the adhesion between the dry electrode and the skin and reduce noise interference.

[0112] It can be seen from Table 1 that compared with Comparative Example 1, the tensile resistance of the dry electrodes of Examples 1 to 5 is better. It can be seen that by limiting the diameter-to-thickness ratio of the flaky silver powder to the range of 50 to 200, it can be effectively ensured that adjacent flaky silver powders are stacked on each other, thereby effectively improving the tensile resistance of the dry electrode. If the diameter-to-thickness ratio of the flaky silver powder is too small, the tensile resistance of the dry electrode cannot be effectively ensured.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A flexible and stretchable dry electrode, characterized in that: include: Flexible substrate; A flexible electrode layer, wherein the flexible electrode layer is disposed on at least a portion of the surface of the flexible substrate, and the flexible electrode layer comprises 30 to 60 parts by weight of flaky silver powder, 5 to 13 parts by weight of silver chloride particles, and 10 to 20 parts by weight of a polymer resin; And the side of the flexible electrode layer away from the flexible substrate has a plurality of protrusion structures.

2. The flexible stretchable dry electrode according to claim 1, characterized in that: The diameter-to-thickness ratio of the flaky silver powder is 50-200.

3. The flexible stretchable dry electrode according to claim 1, characterized in that: The average particle size of the flaky silver powder is 5 μm to 50 μm; And / or, the average particle size of the silver chloride particles is 0.1 μm to 5 μm.

4. The flexible stretchable dry electrode according to claim 1, characterized in that: The average height of the protruding structure is 10 μm to 100 μm.

5. The flexible stretchable dry electrode according to claim 1, characterized in that: The flexible electrode layer includes a flexible electrode base layer, and the protruding structure is arranged on a side of the flexible electrode base layer away from the flexible substrate; the thickness of the flexible electrode base layer is 5 μm to 25 μm; And / or, the thickness of the flexible substrate is 0.05 mm to 0.5 mm.

6. The flexible stretchable dry electrode according to any one of claims 1 to 5, characterized in that: The flexible substrate comprises at least one of thermoplastic polyurethane elastomer rubber, polyethylene, polyethylene terephthalate and polyimide; And / or, the polymer resin includes at least one of polyvinyl butyral resin, epoxy resin, polyurethane resin, silicone resin and acrylic resin.

7. The flexible stretchable dry electrode according to any one of claims 1 to 5, characterized in that: The flexible electrode layer further comprises 1 to 3 parts by weight of an auxiliary agent, wherein the auxiliary agent comprises at least one of a thixotropic agent, a diluent, a leveling agent, a dispersant and a coupling agent.

8. A method for preparing a flexible stretchable dry electrode according to any one of claims 1 to 7, characterized in that: include: (1) mixing a polymer resin, an optional auxiliary agent and a solvent, and heating them to form an organic carrier; (2) mixing flaky silver powder, silver chloride particles and the organic carrier to form a slurry; (3) Printing the slurry on a flexible substrate and drying it to form a flexible stretchable dry electrode.

9. The method according to claim 8, characterized in that In step (1), heating to 60°C to 90°C; and / or, in step (1), the solvent comprises at least one of dibasic acid ester, isophorone, diethylene glycol monobutyl ether, diethylene glycol ethyl ether and diethylene glycol butyl ether; And / or, in step (2), the flaky silver powder is added to the organic carrier and stirred for 20 min to 40 min; then the silver chloride particles are added to the organic carrier and stirred for 10 min to 30 min to form the slurry; And / or, in step (3), the slurry is printed on the flexible substrate by a screen printing method or an inkjet printing method.

10. A bioelectric monitoring device, characterized in that: A flexible stretchable dry electrode according to any one of claims 1 to 7 or a flexible stretchable dry electrode prepared by the method according to claim 8 or 9.

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