CN107545948A - Flexible wire and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of flexible wire, and it includes insulating protective layer and the conductor wire core in insulating protective layer, and conductor wire core includes an at least conductive unit, and every conductive unit includes metalized fibers and wire.The invention also discloses a kind of method for preparing the flexible wire, including：Metal conducting layer is covered on non-metallic fibers surface, obtains metalized fibers, then conductive unit is made in wire incorporation metalized fibers; more conductive unit twisting are allowed to mutually wind; conductor wire core is obtained, then in conductor wire core Surface coating insulating protective layer, flexible wire is made.Flexible wire provided by the invention can replace conventional copper conductor, greatly reduce the weight of wire, the compact structure that the more conductive units wherein used combine, its current carrying capacities is not only increased, improves its electric property, and possess flexibility, it is anti-around folding degree thus to improve it, its preparation technology is simple simultaneously, and cost is cheap, is easy to large-scale industrial production.

Description

Flexible wire and its preparation method

technical field

The invention relates to a flexible wire, in particular to a flexible wire and a preparation method of the wire, and belongs to the technical field of new wire processing.

Background technique

With the rapid development of science and technology and social economy, people have put forward higher and higher requirements for electronic products. As an indispensable unit for the connection of electronic product components, lightweight and flexible wires are the development trend of wires for wearable electronic products. . The wire is composed of a conductive core and an insulating layer. The conductors in traditional wires are generally high-density metal materials. Although the metal wire can be processed with a minimum diameter of about 20 μm, its strength is very poor. While using metal materials to provide reliable current-carrying performance, it also needs to bear its heavy weight, The lack of flexibility is poor; fiber is used as a wire core, which has relatively high strength and good flexibility, but its conductivity is poor or even non-conductive. Therefore, the flexibility of wires has always been a frontier scientific issue that western developed countries attach great importance to, and it is also a technical problem that needs to be solved urgently. At present, the research in this area in western developed countries is also in its infancy, but it has already seen the technical feasibility and application prospects and has attracted much attention. However, my country has basically not yet carried out targeted layout and research and development in this area.

Contents of the invention

The main purpose of the present invention is to provide a flexible wire and its preparation method to overcome the deficiencies in the prior art.

In order to realize the aforementioned object of the invention, the technical solutions adopted in the present invention include:

An embodiment of the present invention provides a flexible wire, which includes: an insulating protective layer and a conductive core located in the insulating protective layer, the conductive core includes at least one conductive unit, and the conductive unit includes a number ratio of 1: 1～5:1 metallized fiber and wire.

As one of the preferred solutions of the present invention, the metallized fiber includes a non-metallic fiber and a metal conductive layer coated on the surface of the non-metallic fiber.

More preferably, the thickness ratio of the non-metallic fibers to the metal conductive layer is 8:1˜10:1.

More preferably, the diameter of the non-metallic fiber is 100 nm-100 μm, and the thickness of the metal conductive layer is 10 nm-10 μm.

As one of the preferred embodiments, the non-metallic fibers include any one of polyester fibers, polyimide fibers, nylon fibers, aramid fibers, ultra-high molecular weight polyethylene fibers, carbon nanotube fibers, and graphene fibers Or a combination of two or more, but not limited thereto.

Further, the material of the metal conductive layer includes any one or a combination of two or more of copper, silver, aluminum, nickel, cobalt, and gold, but is not limited thereto.

Wherein, the metal wire can be selected from metal wires that have been industrially produced.

As one of the preferred embodiments, the diameter of the metal wire is 20 μm˜100 μm.

Further, the material of the metal wire includes any one or a combination of two or more of copper, silver, aluminum, nickel, cobalt, and gold, but is not limited thereto.

More preferably, the diameter of the conductive wire core is 100 nm˜100 μm.

Further, the cross-sectional shape of the conductive wire core includes a circle or a flat line, but is not limited thereto.

Preferably, the conductive core is formed by winding a plurality of conductive units.

More preferably, the conductive wire core is formed by intertwining 3 to 50 conductive units.

As one of the preferred embodiments, the insulating protection layer has a thickness of 100 nm-500 μm.

Further, the insulating protection layer includes a high polymer insulating layer, and the material of the high polymer insulating layer includes any one of polyester, polyamide, polyethylene, polyvinyl chloride, polypropylene, polyimide, and silica gel. One or a combination of two or more, but not limited thereto.

The embodiment of the present invention also provides a method for preparing the flexible wire, which includes the following steps:

(1) Cover the surface of non-metallic fibers with a metal conductive layer to obtain metallized fibers, and then dope the metallized fibers and metal wires at a ratio of 1:1 to 5:1 (for example, preferably 3:1) A conductive unit is obtained;

(2) Twisting a plurality of conductive units to make them intertwine to obtain a conductive core;

(3) Coating an insulating protective layer on the surface of the conductive wire core composed of conductive units to obtain the flexible wire.

Preferably, the aforementioned step (1) includes: using any one of electroplating, electroless plating, vacuum ion sputtering or vacuum evaporation to form a metal conductive layer on the periphery of the non-metallic fiber.

Further, the vacuum ion sputtering method or vacuum evaporation method includes: heating the metal to be filmed to the evaporation temperature in a vacuum environment, then transferring the vapor from the vacuum chamber, and continuously condensing on the low-temperature non-metallic fiber to form a metal conductive layer.

Preferably, the aforementioned step (3) includes: adopting an ultrasonic spraying method or immersing the conductive wire core in a plurality of different polymer solutions or melts in sequence, and using the effect of surface tension to make the polymer solution or melt adhere to the The surface of the conductive wire core is cured, so that a conductor insulation protection layer is respectively formed on the surface of the conductive wire core.

Preferably, the concentration of the polymer solution is 5g/L-500g/L.

Preferably, the temperature of the melt is 50°C to 500°C.

Preferably, the aforementioned step (3) includes: extruding the insulating protective layer onto the surface of the conductive core by coaxial extrusion.

Preferably, the pressure of the coaxial extrusion is 10MPa-100MPa.

Compared with the prior art, the advantages of the present invention include:

1. The flexible wire provided by the present invention is directly coated with a conductive layer on the surface of high-strength non-metallic fibers, that is, after the fiber surface is metallized, the conductivity of the fiber surface can be improved, and its flexibility and strength remain unchanged. Putting it into the metalized fiber tow can greatly reduce the contact resistance and effectively improve its conductivity, and the operation is simple and easy for large-scale industrial production;

2. The flexible wire provided by the present invention twists and twists multiple conductive units together, which can make the combined structure of multiple conductive units more compact, not only enhances its current transmission capacity, further improves its electrical performance, but also has flexibility. The bending resistance has also been further improved;

3. The flexible wire provided by the present invention replaces the conventional copper wire, and while its bending resistance is greatly improved, it can also greatly reduce the weight of the wire;

4. The preparation process of the flexible wire provided by the present invention is simple, easy to implement, low in cost, and easy for large-scale industrial production.

Description of drawings

Fig. 1 is a schematic structural view of a flexible wire in a typical embodiment of the present invention.

detailed description

In view of the deficiencies in the prior art, the inventor of this case has been able to propose the technical solution of the present invention after long-term research and extensive practice, which is mainly an improved flexible wire and its preparation method.

The technical solution of the present invention will be further explained below in conjunction with several embodiments and accompanying drawings.

Please refer to Fig. 1, which is a kind of flexible wire provided by a typical implementation case of the present invention, which includes an insulating protective layer 1 and a conductive wire core located in the insulating protective layer 1, and the conductive wire core includes at least one conductive unit , the conductive unit includes metallized fibers 3 and metal wires 2 . The metallized fibers 3 include non-metal fibers and metal conductive layers coated on the non-metal fibers.

Wherein, the metallized fiber 3 is a carbon fiber tow, and the diameter of each carbon fiber tow is 80 μm; the metal conductive layer coated on the outside is a copper-plated layer with a thickness of 5 μm, and the insulating protective layer 1 is a polyester insulating protective layer .

The conductive wire core of this embodiment is formed by intertwining 3000 copper-plated carbon fiber conductive units and 10 copper wire conductive units, in order to enhance its current carrying capacity.

The preparation method of the flexible wire of the present embodiment comprises the following steps:

(1) Wrap the copper-plated layer on the periphery of the carbon fiber tow by electroplating to obtain copper-plated carbon fibers, then mix 3000 of the copper-plated carbon fibers with 10 copper wires and twist to make them intertwine to obtain a conductive core;

(2) extruding the polyester insulating protective layer to the outer periphery of the conductive wire core obtained in step (1) by a coaxial extrusion method to obtain a flexible wire.

The present invention uses metallized fiber and metal wire as the wire core, which not only makes the wire core have higher strength, but also keeps it flexible, and also has excellent electrical conductivity, so that the flexible wire provided by the invention can replace Conventional copper wire and mass production and application.

What have been described above are only some embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the creative concept of the present invention, other deformations and improvements can also be made, and these all belong to protection scope of the present invention.

Claims (13)

1. A kind of 1. flexible wire, it is characterised in that the conductor wire core including insulating protective layer and in insulating protective layer, it is described Conductor wire core includes an at least conductive unit, and it is 1 that the conductive unit, which includes quantity ratio,:1~5:1 metalized fibers and gold Belong to silk.
2. 2. flexible wire according to claim 1, it is characterised in that：The metalized fibers include non-metallic fibers and bag The metal conducting layer on the non-metallic fibers surface is overlying on, the thickness ratio of the non-metallic fibers and metal conducting layer is 8:1~ 10:1。
3. 3. flexible wire according to claim 2, it is characterised in that：A diameter of 100nm~100 of the non-metallic fibers μm, the thickness of the metal conducting layer is 10nm~10 μm.
4. 4. the flexible wire according to Claims 2 or 3, it is characterised in that：The non-metallic fibers include polyester fiber, gathered In imide fiber, nylon fiber, aramid fiber, superhigh molecular weight polyethylene fibers, carbon nano-tube fibre, graphene fiber Any one or two or more combinations；And/or the material of the metal conducting layer is included in copper, silver, aluminium, nickel, cobalt, gold Any one or two or more combinations.
5. 5. flexible wire according to claim 1, it is characterised in that：The μ of a diameter of 100nm of the conductor wire core~100 m；And/or the cross sectional shape of the conductor wire core includes circular or lenticular wire shape；And/or a diameter of 10 μm of the wire~ 100 μm, and/or, the material of the wire includes any one in copper, silver, aluminium, nickel, cobalt, gold or two or more groups Close.
6. 6. flexible wire according to claim 1, it is characterised in that：The conductor wire core is mutual by complex root conductive unit It is entwined.
7. 7. flexible wire according to claim 6, it is characterised in that：The conductor wire core is by 3~50 conductive unit phases Mutually it is entwined.
8. 8. flexible wire according to claim 1, it is characterised in that：The thickness of the insulating protective layer is 100nm~500 μm；And/or the insulating protective layer includes high polymer insulating barrier, the material of the high polymer insulating barrier includes polyester, polyamides Any one in amine, polyethylene, polyvinyl chloride, polypropylene, polyimides, silica gel or two or more combinations.
9. 9. the preparation method of the flexible wire any one of claim l to 8, it is characterised in that comprise the following steps：

   (1) metal conducting layer is covered on the surface of non-metallic fibers, obtains metalized fibers, then by metalized fibers and wire According to 1:1~5:Conductive unit is made than doping in 1 quantity；

   (2) more conductive unit twisting are allowed to mutually wind, obtain conductor wire core；

   (3) in the Surface coating insulating protective layer for the conductor wire core being made up of conductive unit, the flexible wire is made.
10. 10. the preparation method of flexible wire according to claim 9, it is characterised in that step (1) includes：Using plating, Any one of chemical plating, vacuum ion sputtering method or vacuum vapour deposition form metal conducting layer in the periphery of non-metallic fibers.
11. 11. the preparation method of flexible wire according to claim 10, it is characterised in that the vacuum ion sputtering method or Vacuum vapour deposition includes：By METAL HEATING PROCESS to be filmed to evaporating temperature in vacuum environment, then steam is shifted from vacuum chamber And continuous condense forms metal conducting layer on low temperature non-metallic fibers.
12. 12. the preparation method of flexible wire according to claim 9, it is characterised in that step (3) includes：Using ultrasound The conductor wire core is immersed a variety of different high polymeric solutions or melt by spraying process successively, on the surface of conductor wire core point Insulating protective layer is not formed；Wherein, the concentration of the high polymeric solution is 5g/L~500g/L, and the temperature of the melt is 50 DEG C ~500 DEG C.
13. 13. the preparation method of flexible wire according to claim 9, it is characterised in that step (3) includes：By coaxial Insulating protective layer is expressed to the surface of conductor wire core by extrusion, wherein the pressure of coaxial extruding is 10MPa~100MPa.