Velcro subjected to composite treatment of conductive wire and conductive liquid and preparation method of Velcro

Abstract

The invention discloses a conductive wire and conductive liquid compounded magic tape and a preparation method thereof, and relates to the technical field of magic tapes, the conductive wire and conductive liquid compounded magic tape comprises a magic tape base material, conductive wires with conductive paths are integrated in fibers of the magic tape base material, and a conductive composite layer formed after the conductive liquid is cured is attached to the magic tape base material integrated with the conductive wires. The conductive composite layer wraps at least part of the conductive wires, the conductive composite layer further wraps contact areas of the conductive wires and the adjacent nylon fibers, so that the conductive wires and the conductive composite layer jointly form a three-dimensional conductive network structure, and the conductive wires are at least one of silver-plated fibers, copper wires or stainless steel wires; a physical insulation barrier at the joint can be eliminated, an electric signal channel is allowed to directly and continuously pass through the joint without bypassing, the fault risk caused by complex wiring and additional connection points is reduced, and the overall motion sensing precision and control stability of the robot are improved.

Description

Technical Field

[0001] This invention belongs to the field of hook and loop fastener technology, specifically relating to a hook and loop fastener that is composited with conductive wire and conductive liquid, and its preparation method. Background Technology

[0002] Velcro is a widely used connector in clothing, footwear, bags, medical devices, and military equipment, primarily for quick connection and separation between components. However, when used at the joints of soft robots that require flexible bending and movement, Velcro forms a physical insulation barrier in the joint's active area, forcing signal paths to detour, thus increasing wiring complexity and the risk of failure. Furthermore, during the dynamic operation of repeated bending of the joint, external wires or connectors in contact with it are prone to wear, poor contact, or even momentary disconnection due to friction and compression, directly leading to signal noise, jitter, or interruption. More critically, its material properties make it difficult to integrate seamlessly with the robot body, disrupting the continuity and integrity of flexible sensing or drive circuits at the joint, severely limiting the robot's overall motion perception and control stability.

[0003] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a Velcro device that combines conductive wire and conductive liquid and its preparation method.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a Velcro patch with conductive wire and conductive liquid composite treatment and its preparation method, which can solve the problem that the Velcro patch forms an insulating barrier at the robot joint, forcing the signal line to detour, resulting in signal instability or interruption, which affects the stability of the robot's motion perception and control performance.

[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: A type of hook and loop fastener treated with conductive wires and conductive liquid composite treatment includes a hook and loop fastener substrate. The fibers of the hook and loop fastener substrate have integrated conductive wires with conductive pathways. A conductive composite layer formed by the curing of conductive liquid is attached to the hook and loop fastener substrate with integrated conductive wires. The conductive composite layer wraps at least part of the conductive wires and also wraps the contact area between the conductive wires and adjacent nylon fibers, so that the conductive wires and the conductive composite layer together form a three-dimensional conductive network structure.

[0007] In one or more embodiments of the present invention, the conductive wire is at least one of silver-plated fiber, copper wire or stainless steel wire, and the conductive wire is physically bonded to the nylon fiber of the Velcro substrate by means of embroidery, weaving or knitting.

[0008] In one or more embodiments of the present invention, the conductive wires are distributed in a grid pattern, parallel line pattern, or wavy pattern on the hook and loop substrate.

[0009] In one or more embodiments of the present invention, the conductive composite layer is formed by curing a conductive liquid containing nano-conductive particles and a polymeric binder. The nano-conductive particles include at least one of silver nanoparticles, carbon nanotubes, and graphene, and the polymeric binder includes at least one of polyurethane resin, epoxy resin, and silicone rubber.

[0010] In one or more embodiments of the present invention, the mass percentage of the conductive filament is 5% to 30% of the total fiber mass of the Velcro.

[0011] In one or more embodiments of the present invention, the following steps are included: S1. Conductive filament integration: Integrating conductive filaments into the Velcro substrate in a set pattern; S2. Preparation of conductive liquid: Disperse the nano-conductive particles in a polymer binder solution to form a conductive liquid; S3. Composite coating and curing: The conductive liquid is applied to the Velcro substrate with integrated conductive wires after step S1, and then cured to form a conductive composite layer that encapsulates the conductive wires and nylon fibers.

[0012] In one or more embodiments of the present invention, in step S1, the conductive filament is integrated onto the uncoated Velcro substrate using embroidery equipment, weaving equipment or special knitting equipment.

[0013] In one or more embodiments of the present invention, in step S3, the conductive liquid is applied by scraping, spraying or dipping, and the curing process includes a stepped curing process: first, pre-curing is carried out in a temperature range of 60°C to 80°C, and then final curing is carried out in a temperature range of 100°C to 140°C.

[0014] In one or more embodiments of the present invention, in step S2, the mass fraction of the nano-conductive particles in the conductive liquid is 10%-40%, and the mass fraction of the polymer adhesive is 20%-60%.

[0015] In one or more embodiments of the present invention, step S3 is followed by step S4: applying adhesive backing to the back of the Velcro that has been cured to form a conductive composite layer, and then slitting and winding it.

[0016] In one or more embodiments of the present invention, ...

[0017] Compared with the prior art, the Velcro with conductive wire and conductive liquid composite treatment and its preparation method of the present invention eliminates the physical insulation barrier at the joint through the three-dimensional conductive network structure formed by the conductive wire and conductive composite layer. This allows the electrical signal channel to pass directly and continuously through the joint without detours, simplifies the internal wiring, and reduces the risk of failure introduced by complex wiring and additional connection points. It not only solves the physical insulation barrier at the joint, but also improves the overall motion perception accuracy and control stability of the robot. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the hook and loop fastener in one embodiment of the present invention; Figure 2 As shown in one embodiment of the present invention Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a top view schematic diagram of the distribution of conductive wires on a hook and loop fastener substrate in one embodiment of the present invention; Figure 4 This is a process flow diagram of the preparation method in one embodiment of the present invention.

[0020] Explanation of key figure labels: 1. Hook and loop fastener substrate; 2. Conductive wire; 3. Conductive composite layer; 4. Nylon fiber. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0022] like Figures 1 to 4As shown in Example 1: This example provides a hook and loop fastener composed of mesh-like conductive wires and silver-based conductive liquid, and its preparation method. It includes a hook and loop fastener substrate 1, which includes a hook and loop fastener textured substrate. The hook and loop fastener textured substrate is made of polyester hook and loop fastener texture. On the hook and loop fastener textured substrate, silver-plated nylon conductive wires 2 are integrated in a mesh pattern with a spacing of 5 mm using embroidery technology. The content of conductive wires 2 is about 15% of the total fiber mass. On the surface of the hook and loop fastener textured substrate with integrated conductive wires 2, a layer of conductive liquid is coated and cured to form a continuous conductive composite layer 3. like Figure 2 As shown in the enlarged view, the conductive composite layer 3 not only covers the nylon fibers 4 on the surface of the hook and loop substrate, but more importantly, it completely impregnates and wraps the conductive filaments 2, and forms conductive bridges rich in nano-silver particles between the conductive filaments 2 and the adjacent nylon fibers 4, thereby firmly bonding the conductive filaments 2 and the conductive composite layer 3 into a whole three-dimensional conductive network.

[0023] The preparation method includes the following steps: S1. Conductive filament integration: Select the uncoated hook and loop fastener substrate 1, and use a computerized embroidery machine to embroider the above-mentioned silver-plated nylon conductive filaments onto the surface of the hook and loop fastener substrate according to the preset 5mm×5mm grid pattern. The embroidery tension is controlled appropriately to ensure that the conductive filaments 2 are flat and adhered to the base fabric without significantly affecting the softness of the hook and loop fastener substrate.

[0024] S2. Preparation of conductive liquid: Weigh 30 parts by weight of flake-shaped nano-silver powder as conductive particles. The particle size of the nano-silver powder is between 50-200nm and 200nm. Weigh 50 parts by weight of flexible waterborne polyurethane resin as a polymer binder. The solid content of the polyurethane resin is about 40%. Weigh 15 parts by weight of deionized water as a solvent. Add 5 parts by weight of dispersant and leveling agent. Stir and disperse in a high-speed shear emulsifier for 1 hour to obtain a uniform and stable gray conductive liquid. The speed of the emulsifier is 3000rpm.

[0025] S3. Composite Coating and Curing: Using a scraping method, the conductive liquid prepared in step S2 is uniformly coated onto the surface of the hook and loop fastener substrate treated in step S1, controlling the wet film thickness to be approximately 0.2 mm. The coated material is then sent into an oven for step curing: first, it is pre-baked at 75°C for 3 minutes to evaporate most of the moisture and form a preliminary film, and then it is finally baked at 120°C for 5 minutes to fully crosslink and cure the polyurethane resin, forming a strong conductive composite layer.

[0026] S4. Post-processing: After the hook and loop fastener has completely cooled, apply conventional acrylic hot melt adhesive to its back as a backing adhesive. Finally, cut and roll it according to requirements to obtain the finished conductive hook and loop fastener.

[0027] like Figures 1 to 4 As shown in Example 2: This example provides a conductive hook and loop fastener suitable for flexible electrode connections and its preparation method. The hook and loop fastener substrate 1 also includes a hook and loop hook surface substrate, which is a nylon hook and loop fastener. The conductive wire 2 is a fine copper wire with a diameter of 0.08 mm. It is directly woven into the interior of the hook and loop hook surface substrate in parallel lines during the substrate weaving process using a special weaving device. The wire spacing is 3 mm, and the content accounts for about 8% of the total fiber mass. The conductive composite layer 3 is formed by curing an epoxy resin-based conductive liquid containing carbon nanotubes and graphene. Preparation method: S1. Conductive Wire Integration: When weaving the nylon hook and loop fastener substrate, fine copper wires are simultaneously woven into the fabric as part of the warp yarns at 3mm intervals.

[0028] S2. Preparation of conductive liquid: Mix 20 parts by mass of multi-walled carbon nanotubes and 5 parts by mass of graphene nanosheets as conductive particles, add them to a mixed solution of 60 parts by mass of low-viscosity epoxy resin and curing agent at a mass ratio of 10:3, then add 15 parts by mass of acetone for dilution, and ultrasonically disperse for 2 hours to obtain a black conductive liquid.

[0029] S3. Composite Coating and Curing: Using an immersion method, the hook and loop fastener substrate with copper wire is passed through a tank containing the aforementioned conductive liquid at a speed of 2 m / min to ensure full immersion. After removal, the liquid retention rate is controlled using a squeeze roller, followed by curing: first, baking at 65°C for 4 minutes, then baking at 110°C for 8 minutes to completely cure the epoxy resin.

[0030] S4. Post-processing: Same as in Example 1, apply adhesive backing and cut.

[0031] In the above embodiments, both Embodiment 1 and Embodiment 2 utilize a composite structure of conductive wire 2 and conductive liquid to achieve a temperature as low as 10. 0 -10 3The excellent initial conductivity of Ω / sq and the establishment of multiple redundant conductive paths ensure that signal transmission remains stable even if there is local damage during continuous bending motion of the joint. This simplifies internal wiring, reduces the risk of failure introduced by complex wiring and additional connection points, and effectively solves the pain points of dynamic contact resistance fluctuations and signal interruptions. At the same time, the solid anchoring layer formed after the conductive liquid solidifies can reliably withstand the mechanical stress caused by repeated bending and friction of the joint, effectively avoiding wear, poor contact, and even instantaneous signal interruption caused by long-term dynamic friction of external wires. This ensures stable and low-noise transmission of control and feedback signals during motion. The pattern of conductive wire 2 can be flexibly customized according to the specific circuit layout inside the joint, and the performance of the conductive liquid can also be adjusted. Its soft and flexible properties allow it to be perfectly integrated with the flexible materials and embedded circuits of the robot body, thereby maintaining the electrical continuity and structural integrity of the sensing and drive units in key moving parts of the joint, realizing mechatronics integration. This not only solves the physical insulation barrier at the joint, but also improves the overall motion perception accuracy and control stability of the robot.

[0032] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A type of hook and loop fastener treated with a conductive wire and a conductive liquid composite, comprising a hook and loop fastener substrate, characterized in that, The fibers of the hook and loop fastener substrate are integrated with conductive filaments with conductive pathways. A conductive composite layer is attached to the hook and loop fastener substrate with integrated conductive filaments after the conductive liquid is cured. The conductive composite layer wraps at least part of the conductive filaments and also wraps the contact area between the conductive filaments and the adjacent nylon fibers, so that the conductive filaments and the conductive composite layer together form a three-dimensional conductive network structure.

2. The Velcro according to claim 1, characterized in that, The conductive wire is at least one of silver-plated fiber, copper wire or stainless steel wire, and the conductive wire is physically bonded to the nylon fiber of the Velcro substrate by means of embroidery, weaving or knitting.

3. The Velcro according to claim 2, characterized in that, The conductive wires are distributed in a grid pattern, parallel lines, or wavy pattern on the hook and loop substrate.

4. The Velcro according to claim 1, characterized in that, The conductive composite layer is formed by curing a conductive liquid containing nano-conductive particles and a polymer binder. The nano-conductive particles include at least one of silver nanoparticles, carbon nanotubes, and graphene, and the polymer binder includes at least one of polyurethane resin, epoxy resin, and silicone rubber.

5. The Velcro according to claim 1, characterized in that, The conductive wire accounts for 5% to 30% of the total fiber mass of the Velcro.

6. A method for preparing Velcro with conductive wire and conductive liquid composite treatment as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Conductive filament integration: Integrating conductive filaments into the Velcro substrate in a set pattern; S2. Preparation of conductive liquid: Disperse the nano-conductive particles in a polymer binder solution to form a conductive liquid; S3. Composite coating and curing: The conductive liquid is applied to the Velcro substrate with integrated conductive wires after step S1, and then cured to form a conductive composite layer that encapsulates the conductive wires and nylon fibers.

7. The method according to claim 6, characterized in that, In step S1, the conductive wires are integrated onto the uncoated Velcro substrate using embroidery equipment, weaving equipment, or a special knitting equipment.

8. The method according to claim 6, characterized in that, In step S3, the conductive liquid is applied by scraping, spraying, or dipping, and the curing process includes a stepped curing process: first, pre-curing is carried out in the temperature range of 60°C to 80°C, and then final curing is carried out in the temperature range of 100°C to 140°C.

9. The method according to claim 6, characterized in that, In step S2, the conductive liquid contains 10%-40% by mass of the nano-conductive particles and 20%-60% by mass of the polymer adhesive.

10. The method according to claim 6, characterized in that, Step S3 is followed by step S4: applying adhesive to the back of the Velcro that has cured to form a conductive composite layer, and then cutting and winding it.

Images