CN113417144B - A kind of polythiophene composite nylon conductive fiber and preparation method thereof - Google Patents

Abstract

The invention provides a method for preparing polythiophene composite nylon conductive fibers, comprising the following steps: immersing nylon fibers in an aqueous solution containing polyphenolic compounds at 60°C-70°C for reaction, and then adding a water-soluble oxidant to the aqueous solution , continue the reaction at 70-80°C, and obtain polyphenol-polymerized nylon fibers after the reaction is complete; at 20-30°C and pH 0.5-3, the polyphenol-polymerized nylon fibers are immersed in polyphenol-polymerized nylon fibers containing ferric salt , a polymer dispersant, and a reaction solution of a thiophene derivative to obtain a polythiophene composite nylon conductive fiber. The preparation method of the polythiophene composite nylon conductive fiber provided by the invention does not need to use heavy metal sensitizers and heavy metal main salts, and is green and environmentally friendly; it does not need to pre-treat the nylon fiber with a strong oxidant, and the strength of the nylon fiber is retained; a strong conductive layer and nylon fibers can be obtained. Fiber binding force; low energy consumption, short reaction period, simple operation and high energy utilization rate.

Description

A kind of polythiophene composite nylon conductive fiber and preparation method thereof

technical field

The invention relates to the technical field of fiber modification and preparation, in particular to a polythiophene composite nylon conductive fiber and a preparation method thereof.

Background technique

With the development of industry, the types and quantities of various household appliances and electronic equipment are increasing day by day, and people pay more and more attention to antistatic fibers. The promotion and use of civil conductive fibers will inevitably become a trend. Therefore, the preparation technology of conductive fibers is also constantly developing, and the main part is the preparation of conductive fibers by electroless silver plating. Among many fibers, nylon fibers have a smooth surface and a complete structure and few active reactive groups. The electrical conductivity of nylon fibers has always been one of the main challenges for antistatic fibers to overcome.

Biomimetic mussel chemistry represented by oxidative self-polymerization of polyphenols has attracted great attention from the material industry due to its high utilization rate, excellent effect and green environmental protection, and has been widely used in surface and interface modification and functionalization of materials. The invention patent of x discloses a new type of natural environment-friendly textile dye prepared by oxidative self-polymerization of tea polyphenols; the invention patent of application number 202011158029.4 discloses a tea fiber rich in tea polyphenols that can protect skin and antibacterial and its preparation method ; The invention patent of application number 202010492930.9 discloses a method for preparing a filter membrane by using polydopamine to modify a nanofiber coating base.

Conductive polymers are considered to be new materials in the 21st century due to their good thermal stability, chemical stability, high charge storage capacity, good electrochemical performance and gas separation performance. Polythiophene has attracted great interest of researchers because of its excellent electrical properties, easy preparation, good thermal stability, and high use value after being compounded with other general polymers.

The application of silver-plated nylon conductive fibers is very extensive. At present, the method of chemical silver plating is mainly used to metallize the surface of nylon fibers. The invention patent of application number 201011373886.3 discloses a method of using stannous chloride to sensitize nylon fibers to prepare plating The method of silver conductive nylon fiber; the invention patent of application number: 201910343930.x discloses an anti-oxidation silver-plated nylon fiber with a protective film; application number 201410148781.9 discloses a silver-plated electromagnetic shielding lining cloth made of silver-plated nylon Methods.

The common disadvantage of the current electroless silver plating process is that the sensitizer stannous chloride and the solution containing silver ions used in the electroless silver plating process are heavy metals, which are highly toxic and easily cause respiratory infections and skin diseases in the production and processing process. Therefore, the requirements for production workshops, production equipment and worker protection are extremely high; in addition, the nylon surface is smooth and the reactive groups are few, and strong oxidants are often used for pretreatment, which will cause a significant decrease in the strength of nylon fibers; if no strong oxidant pretreatment is performed, Then the silver-plated layer and the nylon fiber are not firmly combined and easy to fall off; therefore, a new method is developed that does not use heavy metal sensitizers and main salts, which is green and environmentally friendly; no strong oxidant pretreatment is required, and the strength of the nylon fiber is retained; the conductive layer and the nylon fiber are firmly combined The preparation method of nylon conductive fiber is very important for the development of anti-static, electromagnetic shielding, composite materials and other fields.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a polythiophene composite nylon conductive fiber and a preparation method thereof, which do not use heavy metal sensitizers, do not use heavy metal main salts, and do not require strong oxidant pretreatment to retain nylon fiber strength, conductive layer and nylon fiber. Bonds firmly.

The object of the present invention is achieved through the following technical solutions:

The invention provides a method for preparing polythiophene composite nylon conductive fibers, comprising the following steps:

(1) Immerse the nylon fiber in an aqueous solution containing a polyphenol compound at 60°C-70°C, then add a water-soluble oxidant to the solution, and continue the reaction at 70°C-80°C to obtain the reaction solution, After the reaction is completed, polyphenol-polymerized nylon fibers are obtained; the polyphenolic compound is a polyphenolic compound containing a catechol group, preferably, the reaction time is 20-100min, and further preferably, the water-soluble oxidant includes sodium perborate, Sodium persulfate, potassium perborate;

(2) Immerse the polyphenol-polymerized nylon fiber obtained in step (1) into the reaction solution containing ferric salt, polymer dispersant and thiophene derivative at 20-30° C. and pH of 0.5-3 The polythiophene composite nylon conductive fiber is obtained by the reaction in the middle.

Further, before step (1), it also includes step (1a): soaking nylon fibers with sulfuric acid with a concentration of 20-100 mL/L for 20-120 minutes at 40°C-60°C, then washing and dehydrating. This step can roughen the fiber surface and provide more reaction sites.

Further, in step (2), the iron salt includes ferric chloride and/or iron sulfate, and in the reaction solution, the concentration of the iron salt is 0.006-0.02 mol/L.

Further, in step (2), the polymer dispersant includes sodium polystyrene sulfonate, and in the reaction solution, the concentration of the polymer dispersant is 0.5-2 g/L.

Further, the thiophene derivative includes 3,4-ethylenedioxythiophene, and in the reaction solution, the concentration of the thiophene derivative is 0.0007-0.02mol/L.

Further, in step (1), the polyphenolic compound is selected from one or more of eugenol, tannic acid, ferulic acid and chlorogenic acid; the aqueous solution concentration of the polyphenolic compound is 1g/L-5g/L; the water-soluble oxidant includes sodium perborate, sodium persulfate, potassium perborate, and in the reaction solution, the concentration of the water-soluble oxidant is 1g/L-3g/L.

Further, in step (2), the pH of the reaction solution is adjusted by adding sulfuric acid.

Further, the nylon fibers include one or more of nylon 56, nylon 66 and nylon 6 fibers that are plied together. Further, after step (3), step (4) is further included: after washing and dehydrating the silver-plated nylon conductive fiber, drying at 90-140° C. for 2-10 minutes.

Further, after step (3), step (4) is further included: after the polythiophene composite nylon conductive fiber is washed and dehydrated, it is dried at 80-110° C. for 5-30 minutes.

The biomimetic mussel chemistry represented by the oxidative self-polymerization of polyphenols in the present invention replaces the sensitizer stannous chloride in the traditional process with natural polyphenols, which is green and environmentally friendly, and at the same time ensures that the fiber strength is hardly affected, and the polymerized Phenol has strong adhesion and can be deposited on various materials as a secondary reaction platform, which solves the problem of low fastness of subsequent polythiophene. Secondly, compared with the traditional conductive fiber preparation method, thiophene does not contain heavy metal components, is green and environmentally friendly, has higher utilization rate and low cost, and provides a new idea for the preparation of new conductive nylon fibers.

Another object of the present invention is to provide a polythiophene composite nylon conductive fiber, which is prepared by using any of the above preparation methods.

Further, the polythiophene composite nylon conductive fiber of the present invention includes a nylon fiber body, the surface of the nylon fiber body is sequentially provided with a polypolyphenol layer and a conductive layer from the inside to the outside, and the conductive layer includes a plurality of polythiophene polymer chains.

Further, the thickness of the conductive layer is 50-400 nm.

Further, the thickness of the polyphenol layer is 1.5 nm-2.2 μm.

The principle of the preparation method provided by the invention is as follows:

First, the surface of the fiber is optionally roughened with sulfuric acid, which can degrade part of the polyamide and expose more carboxyl and amino groups in the fiber to form reactive sites. Then polyphenols are easily oxidized and self-polymerized under oxidant and alkaline conditions, and the catechol groups are induced to oxidize to quinones, and Michael addition and Schiff reaction occur (see Figure 2 for the relevant reaction formula) to form a covalent cross-linkage. It is linked and grafted on the surface of the fiber, and the inert surface is converted into a highly active polyphenol surface; secondly, after adding iron ions, the polypolyphenols form an effective iron ion adsorption layer through specific coordination and binding with iron ions; The ions can catalyze oxidative polymerization during the polymerization of thiophene, so that the thiophene is polymerized on the surface of the fiber, and after the polymerization of thiophene, the iron ions further play a conductive doping role in the polythiophene, thereby improving the conductivity of the polythiophene. In addition, a polymer dispersant is added in the process of polymerizing thiophene, and it also acts as a dispersant during doping to provide a stable water dispersion system, promote the formation of a stable suspension of thiophene, and then uniformly polymerize thiophene on the surface of nylon fibers. Conductivity.

By means of the above scheme, the present invention has at least the following advantages:

The preparation method of the polythiophene composite nylon conductive fiber provided by the invention does not need to use heavy metal sensitizers, such as stannous chloride, and does not need to use heavy metal main salts, the preparation process is non-toxic, green and environmental protection; Nylon fiber strength, and the polypolyphenol on the fiber surface has strong adhesion, which can be used as a reaction platform for polythiophene, and can obtain a strong bonding force between the conductive layer and nylon fiber; low energy consumption, short reaction period, easy operation Simple, high energy utilization, can expand the use value of nylon fiber, increase the added value of products.

The polythiophene composite nylon conductive fiber provided by the invention has the advantages of high fiber strength, firm bonding of the conductive layer and not easy to fall off, and at the same time, the polypolyphenol has good biocompatibility, and naturally has antibacterial, anti-mite and other properties. All in one.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the description, the following description is given with the preferred embodiments of the present invention and the detailed drawings.

Description of drawings

Fig. 1 is before (a) of embodiment 1 finishing, low magnification (b) after finishing of embodiment 1, high magnification (c) after finishing of embodiment 1, after finishing of embodiment 2 (d), after finishing of embodiment 3 Rear (e) SEM image of the nylon fiber surface.

Fig. 2(a) is the Michael addition reaction formula involved in the principle of the preparation method, and Fig. 2(b) is the Schiff reaction formula involved in the principle of the preparation method.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the figures and examples. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

Example 1

a) Cleaning of nylon 56 fiber: use detergent to remove oil and dirt on the surface of nylon fiber for use;

b) Coarsening of nylon 56 fibers: soak clean nylon 56 fibers with sulfuric acid with a concentration of 20 mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the fiber surface: immerse the nylon 56 fibers roughened in step b) in an aqueous solution containing 2 g/L of tannic acid, shake at 60°C for 30 min, and add sodium perborate until the concentration of the aqueous solution is 3g/L, shake at 70°C for 20min to polymerize the polyphenol on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add anhydrous ferric chloride in deionized water to make the concentration 3g/L and sodium polystyrene sulfonate to make the concentration 0.5g/L, 3,4 -Ethylenedioxythiophene, make its concentration 0.1g/L, stir evenly, put the nylon fiber treated in step c under the strong acid condition of 20°C, and stir for 7 hours;

e) Cleaning and curing: After taking out the fibers, rinse them repeatedly with ethanol and deionized water until the solution is clear, and then quickly dry at 100°C for 20 minutes to obtain conductive nylon 56 fibers coated with poly-3,4-ethylenedioxythiophene. .

Fig. 1(a) is the SEM image of the nylon 56 fiber surface before finishing in step a) of this example; Fig. 1(b) is the SEM image (low magnification) of the surface of the nylon 56 fiber at low magnification after finishing in Example 1; Fig. 1(c) is the SEM image (high magnification) of the surface of nylon 56 fiber after finishing in Example 1; it can be seen that the surface of nylon 56 fiber is smooth before finishing, and the surface of nylon 56 fiber after finishing is covered with dense polythiophene, and the surface is rough ;

Table 1 shows the change of fiber strength at each stage during the treatment process of preparing polythiophene conductive nylon fibers after tannic acid polymerization of polyphenols. It can be seen that the fiber strength after tannic acid polymerization treatment is almost unchanged. In terms of fiber strength It has great advantages. It can be seen from Table 2 that the polythiophene composite nylon conductive fiber prepared by the method in Example 1 also has good electrical conductivity.

Embodiment 2

a) Cleaning of nylon 56 fiber: use detergent to remove oil and dirt on the surface of nylon fiber for use;

b) Coarsening of nylon 56 fibers: soak clean nylon 56 fibers with sulfuric acid with a concentration of 30mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the fiber surface: immerse the roughened nylon fibers in step b) in an aqueous solution containing 2 g/L of ferulic acid, shake at 60°C for 40 min, and add sodium perborate to a concentration of 3 g in the aqueous solution /L, shake at 70°C for 20min to polymerize the polyphenols on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add anhydrous ferric chloride in deionized water to make the concentration 3g/L and sodium polystyrene sulfonate to make the concentration 0.5g/L, 3,4 -Ethylenedioxythiophene, make the concentration 0.3g/L, and stir uniformly. Under a strong acid condition of 30° C., the nylon fibers treated in step c were put in and stirred for 8 hours.

e) After taking out the fiber, repeatedly rinsed with ethanol and deionized water until the solution was clear, and quickly dried at a high temperature at 90°C for 30 minutes to obtain a conductive nylon 56 fiber coated with poly-3,4-ethylenedioxythiophene.

Figure 1(d) is a SEM image of the surface of nylon 56 fiber after finishing in Example 2. After finishing, the surface of nylon 56 fiber is covered with dense polythiophene, and the surface is rough;

It can be seen from Table 2 that the polythiophene composite nylon conductive fiber prepared by the method in Example 2 has good electrical conductivity.

Embodiment 3

a) Cleaning of nylon 56 fiber: use detergent to remove oil and dirt on the surface of nylon fiber for use;

b) Coarsening of nylon 56 fibers: soak clean nylon 56 fibers with sulfuric acid with a concentration of 20 mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the surface of fibers: soak the roughened nylon fibers in step b) in an aqueous solution containing 2 g/L of eugenol, shake at 70°C for 20 min, and add potassium perborate until the concentration of the aqueous solution is 2 g/L L, shake at 70°C for 30 minutes to polymerize the polyphenol on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add anhydrous ferric chloride in deionized water to make the concentration 3g/L and sodium polystyrene sulfonate to make the concentration 0.5g/L, 3,4 -Ethylenedioxythiophene, make the concentration 0.5g/L, and stir uniformly. Under the strong acid condition of 20 ℃, put the nylon fiber treated in step c, and stir for 7 hours;

e) Cleaning and curing: After taking out the fibers, rinse repeatedly with ethanol and deionized water until the solution is clear, and then quickly dry at 90°C for 30 minutes to obtain conductive nylon 56 fibers coated with poly-3,4-ethylenedioxythiophene. .

Figure 1(e) is the SEM image of the nylon 56 fiber after finishing using this method. The surface of the nylon 56 fiber after finishing is covered with dense polythiophene, and the surface is rough.

It can be seen from Table 2 that the polythiophene composite nylon conductive fiber prepared by the method in Example 3 has good electrical conductivity.

Embodiment 4

a) Cleaning of nylon 56 fibers: use detergent to remove oil and dirt on the surface of nylon 56 fibers for use;

b) Coarsening of nylon 56 fibers: soak clean nylon 56 fibers with sulfuric acid with a concentration of 30mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the fiber surface: immerse the roughened nylon fibers in step b in an aqueous solution containing 2 g/L of chlorogenic acid, shake at 75°C for 20 min, and add sodium persulfate to the aqueous solution concentration of 3 g/L L, shake at 75°C for 30 minutes to polymerize the polyphenol on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add ferric sulfate in deionized water to make the concentration 3g/L, sodium polystyrene sulfonate to make the concentration 0.5g/L, 3,4-ethylenedioxy Thiophene to make the concentration 2g/L, and stir uniformly. Under the strong acid condition of 25 ℃, put the nylon 56 fiber treated in step c, and stir for 8 hours;

e) Cleaning and curing: After taking out the fibers, rinse them repeatedly with ethanol and deionized water until the solution is clear, and then quickly dry at 100°C for 20 minutes to obtain conductive nylon 56 fibers coated with poly-3,4-ethylenedioxythiophene. .

After finishing with chlorogenic acid and thiophene, the surface of nylon 56 fiber is covered with dense polythiophene, and the fiber surface is rough and has certain fastness, strength and conductivity.

Embodiment 5

a) Cleaning of nylon 66 fibers: use detergent to remove oil and dirt on the surface of nylon 66 fibers for use;

b) Coarsening of nylon 66 fibers: soak clean nylon 66 fibers with sulfuric acid with a concentration of 30mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the fiber surface: immerse the roughened nylon fibers in step b in an aqueous solution containing 2 g/L of tannic acid, shake at 75°C for 20 min, and add sodium perborate until the concentration of the aqueous solution is 3 g/L L, shake at 75°C for 30 minutes to polymerize the polyphenol on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add anhydrous ferric chloride in deionized water to make the concentration 3g/L and sodium polystyrene sulfonate to make the concentration 0.5g/L, 3,4 -Ethylenedioxythiophene, make the concentration 2g/L, and stir uniformly. Under the strong acid condition of 25 ℃, put the nylon fiber treated in step c, and stir for 8 hours;

e) Cleaning and curing: After taking out the fibers, rinse repeatedly with ethanol and deionized water until the solution is clear, and then quickly dry at 90°C for 25 minutes at high temperature to obtain conductive nylon 66 fibers coated with poly-3,4-ethylenedioxythiophene. .

The surface of nylon 66 fiber after finishing with tannic acid and thiophene is covered with dense polythiophene. The surface of the fiber is rough and has certain fastness and strength. It can be concluded from Table 2 that the polythiophene prepared by the method provided in this example is used. The composite nylon conductive fiber has good electrical conductivity;

Embodiment 6

a) Cleaning of nylon 6 fiber: use detergent to remove oil and dirt on the surface of nylon fiber for use;

b) Coarsening of nylon 6 fiber: soak the clean nylon fiber with sulfuric acid with a concentration of 40mL/L at 40°C, wash and dehydrate after 60 minutes;

c) Polymerization of polyphenols on the fiber surface: the nylon 6 fibers roughened in step b were immersed in an aqueous solution containing 2 g/L of eugenol, shaken at 70 °C for 30 min, and sodium perborate was added until the aqueous solution concentration was 3 g/L L, shake at 75°C for 30 minutes to polymerize the polyphenol on the fiber surface, then take out the fiber, wash it and dehydrate it;

d) Polymerization of thiophene on the surface of nylon fibers: add anhydrous ferric chloride in deionized water to make the concentration 3g/L and sodium polystyrene sulfonate to make the concentration 0.5g/L of 3,4 -Ethylenedioxythiophene, make the concentration 2g/L, and stir uniformly. Under the strong acid condition of 25 ℃, put the nylon 6 fiber treated in step c, and stir for 8 hours;

e) Cleaning and curing: After taking out the fibers, rinse them repeatedly with ethanol and deionized water until the solution is clear, and then quickly dry at 80°C for 30 minutes to obtain conductive nylon 6 fibers coated with poly-3,4-ethylenedioxythiophene. .

The surface of the nylon 6 fiber finished with eugenol and thiophene is covered with dense polythiophene, and the fiber surface is rough and has certain fastness and strength. It can be concluded from Table 2 that the polythiophene composite prepared by the method provided in this example is used. Nylon conductive fiber has good electrical conductivity;

Performance Testing:

Conduct fiber mechanics (according to GBT14337-2008), electrical performance test (according to FZ/T 52032-2014), soaping fastness test (according to GBT14337-2008) to the conductive fibers prepared in the above-mentioned embodiments, the results are as shown in Table 1 and Table 2 and shown in Table 3.

Table 1. The strength of the products obtained in Example 1 at different stages

Table 2. Conductivity of nylon conductive fibers prepared in different examples

Table 3. Soaping fastness of nylon conductive fibers prepared in Example 1

soaping times 1 2 3 4 5 ConductivityS/cm 37.35 45.22 46.30 47.02 47.56 soaping times 6 7 8 9 10 ConductivityS/cm 47.88 48.02 48.07 48.18 48.22

Through the above examples, it can be clarified that the preparation method of the polythiophene composite nylon conductive fiber provided by the present invention does not use heavy metal sensitizers and main salts, and is environmentally friendly; it does not need to pre-treat nylon fibers with strong oxidants, and retains the strength of nylon fibers. At the same time, a strong bonding force between the conductive layer and the nylon fiber can be obtained; the advantages of less energy consumption, short reaction period, simple operation and high energy utilization rate can expand the use value of nylon fiber and increase the added value of the product.

The polythiophene composite nylon conductive fiber provided by the invention has the advantages of high fiber strength, firm bonding of the conductive layer and not easy to fall off, and at the same time, the polypolyphenol has good biocompatibility, and naturally has antibacterial, anti-mite and other properties. All in one.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the technical principles of the present invention. , these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. a method for preparing polythiophene composite nylon conductive fiber, is characterized in that, comprises the following steps: (1) The nylon fiber is immersed in an aqueous solution containing polyphenolic compounds at 60°C-70°C for reaction, and then water-soluble oxidant is added to the aqueous solution, and the reaction is continued at 70°C-80°C, and the reaction is completed. Polyphenol-polymerized nylon fiber; the polyphenolic compound is selected from one or more of eugenol, tannic acid, ferulic acid and chlorogenic acid; the aqueous solution concentration of the polyphenolic compound is 1 g/ L-5 g/L; (2) Immerse the polyphenol-polymerized nylon fiber obtained in step (1) into a reaction solution containing a ferric salt, a polymer dispersant and a thiophene derivative at a temperature of 20-30° C. and a pH of 0.5-3. The polythiophene composite nylon conductive fiber is obtained by the reaction in the middle. 2. The method according to claim 1, characterized in that, before step (1), it further comprises step (1a): soaking the said Nylon fiber 20-120 minutes. 3. The method according to claim 1, wherein in step (2), the ferric salt comprises ferric chloride and/or ferric sulfate, and in the reaction solution, the concentration of the ferric salt It is 0.006-0.02mol/L. 4 . The method according to claim 1 , wherein in step (2), the polymer dispersant comprises sodium polystyrene sulfonate, and in the reaction solution, the concentration of the polymer dispersant is 4 . 0.5-2g/L. The method according to claim 1, wherein in step (2), the thiophene derivative comprises 3,4-ethylenedioxythiophene, and in the reaction solution, the concentration of the thiophene derivative is 0.0007-0.02mol/L. 6. The method according to claim 1, wherein in step (1), the water-soluble oxidant comprises one or more combinations of sodium perborate, sodium persulfate and potassium perborate, and the reaction solution , the concentration of the water-soluble oxidant is 1 g/L-3 g/L. 7 . The method according to claim 1 , wherein, in step (2), the pH of the reaction solution is adjusted by adding sulfuric acid. 8 . 8. The method according to any one of claims 1-7, wherein the nylon fibers comprise one or more of nylon 56, nylon 66 and nylon 6 fibers that are plied. 9 . The method according to claim 1 , further comprising step (4) after step (3): after washing and dehydrating the polythiophene composite nylon conductive fiber, drying at 80-110° C. 5~30min. 10. A polythiophene composite nylon conductive fiber prepared by the method of any one of claims 1-9.

Images