CN103820909A - Conductive yarn and production method thereof - Google Patents

Abstract

The invention relates to a conductive yarn wrapped with metal nanowires and carbon nanomaterials on the yarn and a preparation method thereof. The method is to dip the yarn into a solution of metal nanowires and then dry it by evaporation, and the process can be repeated. Operation, the conductive yarn wrapped with metal nanowires is obtained. Or immerse the yarn wrapped by the metal nanowires into the carbon nanomaterial solution, then evaporate and dry, and repeat it several times to obtain the conductive yarn wrapped by the metal nanowires and the carbon nanomaterials in sequence. Or dip the yarn into a mixed solution of metal nanowires and carbon nanomaterials, then evaporate and dry, and repeat it several times to obtain conductive yarns compositely wrapped by carbon nanomaterials and metal nanowires. The method is extremely simple, easy for industrial production, can be used to produce textile electronic devices, and has extremely wide application prospects.

Description

A kind of conductive yarn and preparation method thereof

technical field

The invention relates to a conductive yarn wrapped with metal nanowires and carbon nanomaterials on the yarn and a preparation method thereof.

Background technique

With the development of science and technology, future electronic products will be flexible, portable and wearable through printable methods, which puts forward intelligent requirements for textiles, that is, smart textiles. Smart textiles will be a landing point for the future electronic information industry, as well as the future development direction and important economic growth point of the textile and garment industry. Among them, conductive yarn is the basic raw material of smart textiles and interactive fabrics, which can be used for sensor connection lines, power electrodes and connection lines, radio frequency circuits, electromagnetic shielding, etc., and has important uses in industrial, civil and military fields. Excellent conductive yarns need to have good conductivity and durability, especially under low humidity, and should also have good friction resistance, buckling resistance, oxidation resistance and corrosion resistance. Traditional conductive yarns are usually made by winding conductive fibers such as stainless steel metal fibers or carbon fibers with non-conductive fibers such as cotton threads and polyester. For example: In 2007, Baoding Yimian Group Co., Ltd. prepared conductive fibers with conductive, anti-wrinkle, and bactericidal effects by mixing polyester, ramie, bamboo fiber, and carbon fiber (public number: CN101182662); in 2009, the school legal person Ritsumeikan; Our company winds the core yarn made of elastic yarn by winding the winding yarn with conductive function, and the clothes made of this yarn can be used to measure biological information (public number: CN101728005A); 2013 Zhejiang Chunjiang Textile Group Co., Ltd. has prepared highly conductive yarns by twisting stainless steel fibers and cotton fibers together. This yarn is widely used in antistatic clothing (public number: CN203096285U); these yarns Although the problem that the stainless steel metal fiber "joint" is easy to puncture the skin has been technically overcome, the metal fiber is still relatively rigid compared to soft yarns such as cotton and polyester. In addition, the clothes will inevitably be damaged during the long-term folding process. Cause the breakage of metal wire, thereby cause unnecessary harm to human body, if these yarns are used as lead wire, also there is the problem on contact.

At present, a large number of scientific researchers have prepared yarns with better conductivity by depositing metal nanomaterials, polymers, carbon nanotubes, graphene, etc. on cotton threads, polyester yarns, etc., and these yarns are washed in laundry detergent. Afterwards, the performance is still good. In addition, these yarns have good friction and resistance to flexion and stretching. For example: The Hong Kong Polytechnic University prepared a 250Ω/cm conductive yarn by depositing a mixed suspension of carbon nanotubes and PVA on different yarns in 2005 (CompositeStructures, 2005, 78, 271-277); in 2011, the University of Salento passed the Depositing silver nanoparticles on wool successfully prepared conductive yarn with bactericidal function (Journalofappliedpolymerscience, 2011, 125, 2239-2244); In 2013, Incheon University in South Korea dipped bovine serum albumin on nylon-6 yarn, and then The deposition of graphite oxide finally produced yarns with electrical conductivity greater than 1000S/m (Advanced Materials, 2013, 25, 5701-5). The present invention proposes a wide range of applications, no need to pre-treat the yarn, through simple dipping and drying, directly wrap metal nanowires and carbon nanomaterials on the yarn to make conductive yarn and its method, the prepared The conductive yarn has excellent flexibility, abrasion resistance and conductivity.

Contents of the invention

Technical problem: the purpose of the present invention is to provide a kind of conductive yarn and preparation method thereof, and this conductive yarn is a kind of conductive yarn that wraps metal nanowire and carbon nanomaterial on the yarn,

Technical solution: the present invention is achieved through the following technical solutions: a conductive yarn of the present invention is wrapped with metal nanowires, or a composite material of metal nanowires and carbon nanomaterials to make conductive yarns.

Yarns used to make conductive yarns include cotton, polyester, nylon, polypropylene, acrylic, vinylon, spandex, linen, jute, combed wool, carded wool, plush, silk spun silk, bamboo fiber or polyester-cotton blends.

Metal nanowires used to make conductive yarns include gold, silver, copper, iron, nickel, cobalt, aluminum, zinc, magnesium, titanium, bismuth, chromium, manganese, tantalum, tungsten, molybdenum, platinum, rhodium, ruthenium, palladium , rhenium or iridium or their alloy nanowires.

The carbon nanomaterial used to prepare the conductive yarn comprises single-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, graphene oxide, reduced graphene oxide, graphene or graphite nanosheets or mixtures thereof.

The preparation method of the conductive yarn of the present invention is as follows: the yarn is dipped into the metal nanowire solution, and then evaporated and dried, and this operation can be repeated to obtain the conductive yarn wrapped by the metal nanowire.

The yarn wrapped by the metal nanowires is dipped into the carbon nanomaterial solution, then dried by evaporation, and repeated several times to obtain the conductive yarns wrapped by the metal nanowires and the carbon nanomaterials in sequence.

Or dip the yarn into the metal nanowire and carbon nanomaterial mixture solution, then dry it by evaporation, and repeat this operation to obtain the conductive yarn wrapped by the metal nanowire and carbon nanomaterial mixture.

Beneficial effects: the method for preparing the conductive yarn provided by the invention is simple, does not damage the spinning yarn, and is easy to produce.

The resistance of the invented conductive spinning thread is adjustable in the range of 0.001-2000Ω/cm.

The invented conductive spinning thread has the bactericidal characteristics of silver nanowires and the high thermal conductivity of graphene/carbon nanotubes.

The invented conductive yarn can be used in fields such as smart textiles and electromagnetic shielding.

Detailed ways

The invention relates to a conductive yarn wrapped with metal nanowires and carbon nanomaterials on the yarn and a preparation method thereof. The yarn is dipped into a metal nanowire solution, and then evaporated and dried, and this operation can be repeated. A conductive yarn wrapped with metal nanowires was obtained. Or immerse the yarn wrapped by the metal nanowires into the carbon nanomaterial solution, then evaporate and dry, and repeat it several times to obtain the conductive yarn wrapped by the metal nanowires and the carbon nanomaterials in sequence. Or dip the yarn into a mixed solution of metal nanowires and carbon nanomaterials, then evaporate and dry, and repeat it several times to obtain conductive yarns compositely wrapped by carbon nanomaterials and metal nanowires. Yarns used include, but are not limited to, cotton, polyester, nylon, polypropylene, acrylic, vinylon, spandex, linen, jute, combed wool, carded wool, plush, silk spun silk, bamboo fiber, and polyester-cotton blends; Metal nanowires include, but are not limited to, gold, silver, copper, iron, nickel, cobalt, aluminum, zinc, magnesium, titanium, bismuth, chromium, manganese, tantalum, tungsten, molybdenum, platinum, rhodium, ruthenium, palladium, rhenium , iridium and its alloy nanowires; carbon nanomaterials used include, but are not limited to, single-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, graphene oxide, reduced graphene oxide, graphene, graphite nano Tablets and mixtures thereof.

The preparation method is as follows:

(1) Select a section of cotton, polyester, nylon, polypropylene, acrylic, vinylon, spandex, flax, jute, combed wool, carded wool, plush, silk spun silk, bamboo fiber and polyester-cotton blended yarn (length according to your needs) decision) yarn, do not do anything to the thread.

(2) Immerse the selected yarn in the metal nanowire solution, take it out and dry it in the air or dry it, and repeat it several times to prepare the spun yarn wrapped by the metal nanowire.

(3) The metal nanowire solution includes metal nanowires, solvent, dispersant and binder.

(4) Metal nanowires include, but are not limited to, gold, silver, copper, iron, nickel, cobalt, aluminum, zinc, magnesium, titanium, bismuth, chromium, manganese, tantalum, tungsten, molybdenum, platinum, rhodium, ruthenium, palladium , rhenium, iridium and their alloy nanowires.

(5) Solvents include water, methanol, ethanol, isopropanol, ethylene glycol, methyl ether, ether, methyl ethyl ether, acetone, methyl ethyl ketone, methyl ethyl ketone, chloroform, carbon tetrachloride, benzene, toluene, tetrahydrofuran, dimethyl Formamide, Dimethyl Sulfoxide, Acetic Acid, Methyl Formate and mixtures thereof.

(6) Dispersants include sodium lauryl sulfate, cetyltrimethylammonium bromide, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, span80, and TritonX-100.

(7) Binders include cellulose, chitosan, Nafion, epoxy resin, phenolic resin, polyamino acid methyl ester.

(8) Immerse the spinning wire wrapped by metal nanowires into the carbon nanowire solution, take it out and dry it in the air or dry it, and repeat it many times, the metal nanowires and the conductive yarns wrapped by carbon nanomaterials in turn.

(9) The carbon nanomaterial solution includes carbon nanomaterials, solvent (same as step 5), dispersant (same as step 6) and binder (same as step 7).

(10) Carbon nanomaterials include, but are not limited to, single-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, graphene oxide, reduced graphene oxide, graphene, graphite nanosheets and mixtures thereof.

(11) The metal nanowire-wrapped spinning yarn prepared in step 2 is operated according to step 8 to obtain a conductive yarn wrapped by metal nanowires/carbon nanomaterials in sequence.

(12) Immerse the selected yarn into the mixed solution of metal nanowires and carbon nanomaterials, take it out and dry it in the air or dry it, and repeat it several times to prepare conductive spinning yarns mixed with metal nanowires and carbon nanomaterials .

(13) The electrical resistance of the conductive yarn can reach 30Ω/cm.

Example 1

①Choose a section of cotton yarn without any treatment on the thread.

② Add 0.02-0.5 grams of silver nanowires to a mixed solution of water and isopropanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of cellulose to make silver nanowire solution.

③ Immerse the yarn in the silver nano solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive silver nanowire conductive yarn.

Example 2

① Select a section of silver nanowire conductive yarn in Example 1 without any treatment.

② Add 0.02-0.5 grams of single-walled carbon nanotubes to a mixed solution of water and isopropanol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of cellulose to prepare solution of single-walled carbon nanotubes.

③Put the silver nanowire conductive yarn in the single-wall carbon nanotube solution, and then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by silver nanowire and single-wall carbon nanotube in sequence. yarn.

Example 3

①Choose a section of polyester yarn and do not do any treatment on the thread.

② Add 0.02-0.5 g of copper nanowires to the tetrahydrofuran solution, and then add 0.001-0.1 g of polyvinyl alcohol and 0.0001-0.001 g of epoxy resin to prepare a copper nanowire solution.

③ Immerse the yarn in the copper nanometer solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive copper nanowire conductive yarn.

Example 4

① Select a section of copper nanowire conductive yarn in Example 3 without any treatment.

② Add 0.02-0.5 grams of graphene to a mixed solution of water and isopropanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of chitosan to make a single solution of walled carbon nanotubes.

③ Place the copper nanowire conductive yarn in the graphene solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by copper nanowire and graphene in sequence.

Example 5

①Choose a section of nylon yarn, do not do any treatment to the line.

② Add 0.02-0.5 grams of nickel nanowires to a mixed solution of water and isopropanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of Nafion to make nickel nanowires line solution.

③ Immerse the yarn in the nickel nano solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive nickel nanowire conductive yarn.

Implementation Case 6

① Select a section of nickel nanowire conductive yarn in Example 5 without any treatment.

② Add 0.02-0.5 grams of double-walled carbon nanotubes to a mixed solution of water and isopropanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of epoxy resin, Prepare double-walled carbon nanotube solution.

③ Put the nickel nanowire conductive yarn in the double-walled carbon nanotube solution, then take it out and dry it at 1-200°C. yarn.

Implementation Case 7

①Choose a section of polypropylene yarn, do not do any treatment to the line.

② Add 0.02-0.5 grams of gold nanowires to a mixed solution of water and ethanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of hexadecyltrimethylammonium bromide and 0.0001-0.001 grams of phenolic resin to prepare into a gold nanowire solution.

③ Immerse the yarn in the gold nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive gold nanowire conductive yarn.

Implementation Case 8

① Select a section of gold nanowire conductive yarn in Example 7 without any treatment.

② Add 0.02-0.5 grams of graphene nanosheets to a mixed solution of water and ethylene glycol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of polyamino acid methyl ester to make graphene nanosheet solution.

③ Put the gold nanowire conductive yarn in the graphene nanosheet solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by gold nanowire and graphene nanosheet in sequence .

Implementation Case 9

①Choose a section of acrylic yarn, do not do any treatment to the line.

② Add 0.02-0.5 g of zinc nanowires to a mixed solution of water and ethanol with a volume ratio of 0.1-10, then add 0.001-0.1 g of polyvinylpyrrolidone and 0.0001-0.001 g of cellulose to prepare a zinc nanowire solution.

③ Immerse the yarn in the zinc nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive zinc nanowire conductive yarn.

Implementation Case 10

① Select a section of zinc nanowire conductive yarn in Example 9 without any treatment.

② Add 0.02-0.5 grams of reduced graphene oxide to a mixed solution of water and ethylene glycol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of chitosan to prepare into a reduced graphene oxide solution.

③ Put the zinc nanowire conductive yarn in the reduced graphene oxide solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped with zinc nanowire and reduced graphene oxide in sequence .

Implementation Case 11

①Choose a section of vinylon yarn, do not do any treatment on the line.

② Add 0.02-0.5 grams of iron nanowires to the mixed solution of water and dimethyl sulfoxide with a volume ratio of 0.1-10, then add 0.001-0.1 grams of sodium lauryl sulfate and 0.0001-0.001 grams of chitosan, Prepare iron nanowire solution.

③ Immerse the yarn in the iron nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive iron nanowire conductive yarn.

Implementation Case 12

① Select a section of iron nanowire conductive yarn in Example 11 without any treatment.

② Add 0.02-0.5 grams of multi-walled carbon nanotubes to a mixed solution of water and methyl ether with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of hexadecyltrimethylammonium bromide and 0.0001-0.001 grams of Nafion , made of multi-walled carbon nanotube solution.

③Place the iron nanowire conductive yarn in the multi-walled carbon nanotube solution, and then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by the iron nanowire and the multi-walled carbon nanotube in sequence. yarn.

Implementation Case 13

①Choose a section of spandex yarn and do not do any treatment on the thread.

② Add 0.02-0.5 grams of aluminum nanowires to a mixed solution of water and methyl ethyl ether with a volume ratio of 0.1-10, then add 0.001-0.1 grams of hexadecyltrimethylammonium bromide and 0.0001-0.001 grams of epoxy resin , made of aluminum nanowire solution.

③ Immerse the yarn in the aluminum nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive aluminum nanowire conductive yarn.

Implementation Case 14

① Select a section of aluminum nanowire conductive yarn in Example 13 without any treatment.

② Add 0.02-0.5 grams of graphene to the mixed solution of water and methyl ether with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of phenolic resin to prepare a graphene solution.

③ Put the aluminum nanowire conductive yarn in the graphene solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by aluminum nanowire and graphene in sequence.

Implementation Case 15

①Choose a piece of flax yarn and do not do any treatment on the thread.

② Add 0.02-0.5 grams of silver alloy nanowires to a mixed solution of water and toluene with a volume ratio of 0.1-10, then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of polyamino acid methyl ester to make silver alloy nanowires solution.

③ Immerse the yarn in the silver nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive silver alloy nanowire conductive yarn.

Implementation Case 16

① Select a section of silver alloy nanowire conductive yarn in Example 15 without any treatment.

② Add 0.02-0.5 grams of graphene to the mixed solution of water and ethanol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of span80 to prepare a graphene solution.

③Put the silver alloy nanowire conductive yarn in the graphene solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by silver alloy nanowire and graphene in sequence.

Implementation Case 17

①Choose a section of jute yarn and do not do any treatment on the thread.

② Add 0.02-0.5 grams of copper alloy nanowires to a mixed solution of water and chloroform with a volume ratio of 0.1-10, then add 0.001-0.1 grams of polyethylene glycol and 0.0001-0.001 grams of cellulose to make a copper alloy nanowire solution .

③ Immerse the yarn in the copper alloy nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive copper alloy nanowire conductive yarn.

Implementation Case 18

① Select a section of copper alloy nanowire conductive yarn in Example 17 without any treatment.

② Add 0.02-0.5 grams of graphene oxide to a mixed solution of water and ethanol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of chitosan to prepare a graphene oxide solution.

③ Put the copper alloy nanowire conductive yarn in the graphene oxide solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by copper alloy nanowire and graphene oxide in sequence .

Implementation Case 19

①Choose a section of silk spun silk yarn and do not do any treatment to the thread.

② Add 0.02-0.5 grams of nickel alloy nanowires to a mixed solution of water and dimethyl sulfoxide with a volume ratio of 0.1-10, then add 0.001-0.1 grams of TritonX-100 and 0.0001-0.001 grams of cellulose to make nickel Alloy nanowire solution.

③ Immerse the yarn in the nickel alloy nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive nickel alloy nanowire conductive yarn.

Implementation Case 20

① Select a section of nickel alloy nanowire conductive yarn in Example 19 without any treatment.

② Add 0.02-0.5 grams of less-walled carbon nanotubes to a mixed solution of water and ethanol with a volume ratio of 0.1-10, then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of polyamino acid methyl ester to make less-walled carbon nanotube solution.

③Put the conductive yarn of nickel alloy nanowires in the solution of few-walled carbon nanotubes, and then take them out and dry them at 1-200°C. This process can be carried out many times to prepare nickel alloy nanowires and few-walled carbon nanotubes to wrap in turn conductive yarn.

Implementation Case 21

① Select a section of polyester-cotton blended yarn without any treatment on the thread.

② Add 0.02-0.5 grams of gold alloy nanowires to a mixed solution of water and acetone with a volume ratio of 0.1-10, then add 0.001-0.1 grams of cetyltrimethylammonium bromide and 0.0001-0.001 grams of cellulose, A gold alloy nanowire solution was prepared.

③ Immerse the yarn in the gold alloy nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive gold alloy nanowire conductive yarn.

Implementation Case 22

① Select a section of gold alloy nanowire conductive yarn in Example 21 without any treatment.

② Add 0.02-0.5 grams of graphite nanosheets to a mixed solution of water and ethanol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of Nafion to prepare a graphite nanosheet solution.

③ Put the gold alloy nanowire conductive yarn in the graphite nanosheet solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by gold alloy nanowire and graphite nanosheet in sequence .

Implementation Case 23

①Choose a section of bamboo fiber yarn and do not do any treatment to the thread.

② Add 0.02-0.5 grams of iron alloy nanowires to a mixed solution of water and carbon tetrachloride with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinylpyrrolidone and 0.0001-0.001 grams of polyamino acid methyl ester to prepare Iron alloy nanowire solution.

③ Immerse the yarn in the iron alloy nanowire solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare a highly conductive iron alloy nanowire conductive yarn.

Implementation Case 24

① Select a section of ferroalloy nanowire conductive yarn in Example 23 without any treatment.

② Add 0.02-0.5 grams of graphene nanosheets to a mixed solution of water and ethanol with a volume ratio of 0.1-10, and then add 0.001-0.1 grams of polyvinyl alcohol and 0.0001-0.001 grams of Nafion to prepare a graphene nanosheets solution.

③Place the ferroalloy nanowire conductive yarn in the graphene nanosheet solution, then take it out and dry it at 1-200°C. This process can be carried out many times to prepare the conductive yarn wrapped by the ferroalloy nanowire and graphene nanosheet in sequence .

Claims (7)

1. A conductive yarn, characterized in that a metal nanowire is wrapped on the yarn, or a metal nanowire and carbon nanomaterial composite material is made into a conductive yarn. 2. conductive yarn according to claim 1, is characterized in that, the yarn that is used to prepare conductive yarn comprises cotton, polyester, nylon, polypropylene fiber, acrylic fiber, vinylon, spandex, flax, jute, combed wool, carded wool , plush, silk spinning, bamboo fiber or polyester-cotton blend. 3. The conductive yarn according to claim 1, wherein the metal nanowires used to prepare the conductive yarn comprise gold, silver, copper, iron, nickel, cobalt, aluminum, zinc, magnesium, titanium, bismuth, Nanowires of chromium, manganese, tantalum, tungsten, molybdenum, platinum, rhodium, ruthenium, palladium, rhenium or iridium or their alloys. 4. conductive yarn according to claim 1, is characterized in that, the carbon nanomaterial that is used to prepare conductive yarn comprises single-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, graphene oxide, Reduced graphene oxide, graphene or graphite nanoplatelets or mixtures thereof. 5. A preparation method of conductive yarn as claimed in claim 1, characterized in that: the yarn is dipped into the metal nanowire solution, then dried by evaporation, and this operation can be repeated to obtain the metal nanowire wrapped conductive yarn. 6. The preparation method of conductive yarn according to claim 5, characterized in that: the yarn wrapped by the metal nanowire is dipped into the carbon nanomaterial solution, then evaporated and dried, and repeated several times to obtain the metal nanowire Conductive yarns wrapped sequentially by nanowires and carbon nanomaterials. 7. a kind of preparation method of conductive yarn as claimed in claim 5 is characterized in that: yarn is dipped in metal nanowire and carbon nanomaterial mixture solution, then by evaporative drying, and repeat this operation, obtain Conductive yarns wrapped in a mixture of metal nanowires and carbon nanomaterials.