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CN-111864412-B - Flexible conductive connecting piece of liquid metal-based flexible wire and preparation method thereof

CN111864412BCN 111864412 BCN111864412 BCN 111864412BCN-111864412-B

Abstract

The invention provides a flexible conductive connecting piece of a liquid metal-based flexible wire and a preparation method thereof. The flexible conductive connecting piece comprises a flexible high polymer material and a plurality of strips of wire-shaped conductive materials, wherein the flexible high polymer material is coated on the periphery of the wire-shaped conductive materials, a liquid metal layer is arranged at one end of the wire-shaped conductive materials along the length direction of the wire-shaped conductive materials, when the flexible conductive connecting piece is connected with a flexible wire, one end of the flexible conductive connecting piece, which is provided with the liquid metal layer, stretches into the flexible wire, and the liquid metal layer is contacted with the liquid metal in the flexible wire to form conductive connection. The connecting piece can be connected with the flexible wire in a good conductive way, has good flexibility and stability, forms a full flexible structure with the flexible wire, and has wide application prospect in flexible electronic technology.

Inventors

  • ZHOU YOULIN
  • WU ZHENGUANG
  • LI ZHEN
  • SUN DANDAN

Assignees

  • 宁波韧和科技有限公司

Dates

Publication Date
20260505
Application Date
20200818

Claims (15)

  1. 1. A connection method of a liquid metal-based flexible wire and a flexible conductive connecting piece is characterized in that the liquid metal-based flexible wire comprises a first liquid metal and an elastomer, and has conductivity under a stretching condition, and the connection method is characterized in that: The elastic body is in a tubular structure, and the first liquid metal is positioned in the tubular structure; the flexible conductive connecting piece comprises a flexible high polymer material and a plurality of strips of wire-shaped conductive materials, wherein the flexible high polymer material is coated on the periphery of the wire-shaped conductive materials; The preparation method of the flexible conductive connecting piece comprises the following steps: (1) Arranging a plurality of strips of wire-like conductive material; (2) Coating a flexible high polymer material on the periphery of the arranged filiform conductive materials, and vertically cutting off one end of the filiform conductive material coated with the flexible high polymer material to expose the end of the filiform conductive material; (3) A second liquid metal layer is arranged at the exposed end of the filiform conductive material, and the forming method of the second liquid metal layer is to immerse the end of the filiform conductive material coated with the flexible high polymer material processed in the step (2) into liquid metal to adhere the exposed end to the second liquid metal; when the flexible conductive connecting piece is connected with the flexible wire, one end of the flexible conductive connecting piece, which is provided with the second liquid metal layer, stretches into the flexible wire, and the second liquid metal layer is contacted with the first liquid metal in the flexible wire to form conductive connection.
  2. 2. The method of joining according to claim 1, wherein said first liquid metal is disposed in said tubular structure by one or more of injection, filling, blending, coextrusion, simultaneous injection molding, 3D printing.
  3. 3. The method of claim 1, wherein the elastomer comprises one or more of silicone, polyurethane, polypropylene, polyimide, polyester, polylactic acid, polydimethylsiloxane, polyvinyl alcohol, SEBS, POE, ecoflex.
  4. 4. The method of claim 1, wherein the flexible conductive connector is connected to the liquid metal-based flexible conductor by bonding, stitching, riveting, plugging, snapping or by a flexible fixing layer.
  5. 5. The method of claim 4, wherein the fixing layer material comprises one or more of glue, silica gel, polyurethane, polypropylene, polyethylene, epoxy resin, and polylactic acid.
  6. 6. The method of claim 1, wherein the plurality of strips of electrically conductive material are arranged in one or more of parallel, staggered, parallel, spiral weave, and wound.
  7. 7. The method of claim 1, wherein the filamentary conductive material comprises one or more of a metal wire, a conductive yarn, fibrous graphene, carbon nanotubes, fibrous graphite, and a composite thereof with an elastic material.
  8. 8. The method of claim 7, wherein the wire comprises one or more of copper wire, gold wire, silver wire, indium wire, and tin wire.
  9. 9. The method of claim 1, wherein the flexible polymeric material is coated on the periphery of the filamentous conductive material by one or more of dipping, knife coating, chemical growth, extrusion, injection molding, turning, and milling.
  10. 10. The method of claim 1, wherein the flexible polymeric material has a coating thickness of 100 nm to 500. Mu.m.
  11. 11. The method of claim 1, wherein the flexible polymer material comprises one or more of silica gel, polyurethane, polypropylene, polyimide, polyester, polylactic acid, polydimethylsiloxane, and polyvinyl alcohol.
  12. 12. The method of claim 1, wherein the liquid metal comprises mercury, gallium indium alloy, gallium indium tin alloy, an ion conductive liquid, or a conductive gel.
  13. 13. The method of claim 1, wherein the liquid metal comprises a transition metal and/or a solid nonmetallic element doped gallium indium alloy.
  14. 14. The method of claim 1, wherein the liquid metal comprises a transition metal and/or a solid nonmetallic element doped gallium indium tin alloy.
  15. 15. The method of claim 1, wherein the exposing the end of the wire-like conductive material in the step (2) comprises one or more of cutting, slicing, grinding, plasma treating, and laser treating.

Description

Flexible conductive connecting piece of liquid metal-based flexible wire and preparation method thereof Technical Field The invention relates to the technical field of flexible electronics, in particular to a flexible conductive connecting piece of a liquid metal-based flexible wire and a preparation method thereof. Background With the development of flexible electronics and wearable equipment, flexible wires are receiving more and more attention due to the stretchability and comfort of the flexible wires, and the flexible wires have wide application prospects in the fields of human-computer interaction, human health/motion monitoring, intelligent clothing and the like. At present, the flexible wire is mainly three kinds of (1) a flexible wire woven by directly using conductive yarns, conductive fibers and the like, has low conductivity and is not resistant to kneading and washing, (2) a flexible wire wound into a spring wire and other forms by using a traditional copper wire, has an insufficiently compact structure and poor touch feeling, (3) a flexible wire formed by filling a flexible tube with liquid metal, ionic liquid and the like, has good conductivity and flexibility, but is easy to cause leakage of liquid substances when the flexible wire is cut, so the flexible wire can not be cut at will, and (4) a conductive polymer compounded by conductive silver paste, conductive gel, conductive filler and the like is used as the flexible wire, and the flexible wire is not resistant to bending, poor in tensile stability or poor in conductivity. In comparison, the (3) flexible lead has better conductivity and flexibility and application prospect. At present, two main connecting methods exist for connecting the flexible wire with the external conductive unit: (1) The method introduces a rigid electrode, thereby damaging the flexibility of a liquid metal wire and causing uncomfortable use feeling; (2) The conductive adhesive is used for filling, sealing and connecting, but the conductive adhesive has poor conductivity and cannot meet the use environment with high requirements on conductivity. Therefore, how to conduct and connect the flexible lead and the outside makes the connection part have important significance for realizing the fully flexible conductor while taking good conductivity, softness and stability into consideration. Disclosure of Invention The invention provides a connecting piece aiming at a flexible wire based on liquid metal, which can realize good conductive connection with the flexible wire, has good flexibility and stability and forms a full-flexible structure with the flexible wire. The technical scheme is that the flexible conductive connecting piece of the liquid metal-based flexible wire comprises a first liquid metal and an elastomer, and has conductivity under the stretching condition, and is characterized by comprising a flexible high polymer material and a plurality of strips of wire-shaped conductive materials, wherein the flexible high polymer material is coated on the periphery of the wire-shaped conductive materials; when the flexible conductive connecting piece is connected with the flexible wire, one end of the flexible conductive connecting piece, which is provided with the second liquid metal layer, stretches into the flexible wire, and the second liquid metal layer is contacted with the first liquid metal in the flexible wire to form conductive connection. As one implementation, the elastomer is a tubular structure in which the first liquid metal is located. The method by which the first liquid metal and the elastomer form the structure is not limited, and includes one or more of injection, filling, blending, coextrusion, simultaneous injection molding, 3D printing, and the like. The elastomer includes, but is not limited to, one or more of silica gel, polyurethane (PU), polypropylene (PP), polyimide (PI), polyesters (PET, PBT, etc.), polylactic acid (PLA), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), SEBS, POE, ecoflex, etc. The connection mode of the flexible conductive connecting piece and the liquid metal-based flexible lead is not limited, and the flexible conductive connecting piece and the liquid metal-based flexible lead are bonded, sewed, riveted, plugged, buckled and the like at the contact part or are fixedly connected together through a flexible fixing layer. The flexible fixing layer is made of materials with an adhesive effect, including but not limited to one or more of glue, silica gel, polyurethane, polypropylene, polyethylene, epoxy resin, polylactic acid and the like. The arrangement of the plurality of strips of the wire-like conductive material is not limited, and includes one or more of parallel, staggered, parallel, spiral woven, wound, etc. The thread-shaped conductive material is not limited and comprises one or more of metal wires, conductive yarns, fibrous graphene, carbon nanotubes, fibrous graphite and the like, and a composite material