阅读说明：本技术 一种导电纤维的制作方法 (Method for manufacturing conductive fiber ) 是由 刘宜芳 于 2021-07-19 设计创作，主要内容包括：一种导电纤维的制作方法,用于导电织物的编织,属于导电纤维系统领域。该导电纤维的制作方法,步骤为(1)配置纳米银电解溶液、(2)制备银纳米聚合物颗粒、(3)制备改性碳纤维、(4)制备导电纤维。本发明能促进环氧树脂的分子链闭合,形成高强度的外壳,保证纤维中银离子的黏附,降低银离子的损耗,通过引入氨丙基三乙氧基硅烷,通过碳纤维表面的羧基与氨丙基三乙氧基硅烷中的氨基结合,使之在碳纤维表面形成长段分子链,提高碳纤维和后面纤维浆粕的连接能力,而且氨丙基三乙氧基硅烷分子链可以和银纳米聚合物颗粒交联,提高纤维体系的晶体密度,使得制备出来的导线纤维强度更高导电性更强。(A manufacturing method of conductive fiber is used for weaving conductive fabric, belonging to the field of conductive fiber system. The preparation method of the conductive fiber comprises the steps of (1) preparing nano silver electrolytic solution, (2) preparing silver nano polymer particles, (3) preparing modified carbon fibers, and (4) preparing the conductive fiber. The invention can promote the molecular chain closure of epoxy resin, form a high-strength shell, ensure the adhesion of silver ions in the fiber, reduce the loss of the silver ions, form long-section molecular chains on the surface of the carbon fiber by introducing aminopropyltriethoxysilane and combining carboxyl on the surface of the carbon fiber with amino in the aminopropyltriethoxysilane, improve the connecting capability of the carbon fiber and the following fiber pulp, and the aminopropyltriethoxysilane molecular chains can be crosslinked with silver nano polymer particles, improve the crystal density of a fiber system, so that the prepared lead fiber has higher strength and stronger conductivity.)

1. The manufacturing method of the conductive fiber is characterized by comprising the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.2-1.8 by hydrochloric acid to obtain an electrolytic aqueous solution for later use;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 5-6% of that of the toluene;

adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte at 2-6 deg.C and the rotating cathode current density at 18-20A/dm²Electrolyzing for 1.5-2h under the voltage of 50-60V in an electrolytic bath, collecting the upper-layer toluene solution, adding ethanol, reducing the temperature to-10-15 ℃, standing for 2-3h for full precipitation, collecting the precipitate, washing for 2-3 times by using purified water, and drying at the temperature of 100-120 ℃ to obtain silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water with the mass of 20-23 times of that of the carbon fibers, adding perchloric acid with the mass of 1-2% of that of the solution, stirring for 20-26min, centrifugally collecting the carbon fibers, washing with the purified water, drying under reduced pressure at normal temperature, preparing the obtained carbon fibers and benzene into a solution with the mass of 2-3mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 80-85 ℃, magnetically stirring for 20-30min, recovering benzene from the solution under reduced pressure at 60-65 ℃, washing precipitates with ethanol, and drying under reduced pressure to obtain modified carbon fibers;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 20-30min, adding sodium lignosulfonate, adjusting the pH value to 10-11, adjusting the pressure in a squeezer to 5-10KPa, squeezing for 30-40min, controlling the temperature to 23-25 ℃, treating for 15-20min by using ultrasonic waves of 300-500W, reducing the temperature to 20-22 ℃, standing for 30-50min, continuing to perform ultrasonic treatment for 10-15min, increasing the temperature to 28-30 ℃, standing for 20-25min, adding silver nano polymer particles, stirring for 20-30min, adding modified carbon fibers, stirring for 1-2h, and spinning to obtain the fibers.

2. The method for manufacturing the conductive fiber according to claim 1, wherein in the step (1), the mass fraction of the silver chloride solution is 3-6%.

3. The method for manufacturing the conductive fiber according to claim 1, wherein in the step (1), the mass fraction of the lanthanum chloride is 0.1-0.2%.

4. The method for manufacturing the conductive fiber according to claim 1, wherein in the step (1), the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 1-2.

5. The method for preparing the conductive fiber according to claim 1, wherein in the step (1), the amount of the sodium chloride is 1-2% of the mass of the electrolytic aqueous solution.

6. The method for preparing conductive fiber according to claim 1, wherein in the step (1), the amount of the oleic acid is 0.5-1% of the mass of the electrolytic aqueous solution.

7. The method for preparing conductive fiber according to claim 1, wherein in the step (1), the amount of gelatin is 5-8% of the mass of the electrolytic aqueous solution.

8. The method for manufacturing the conductive fiber according to claim 1, wherein in the step (1), the dosage of the chitosan hydrochloride is 0.8-1.2% of the mass of the electrolytic aqueous solution.

9. The method for preparing conductive fiber according to claim 1, wherein in the step (3), the amount of aminopropyltriethoxysilane is 80-86% by mass of the carbon fiber.

10. The method for preparing the conductive fiber according to claim 1, wherein in the step (4), the amount of the sodium lignosulfonate is 0.3-0.5% of the mass of the pulp; the dosage of the silver nano polymer particles is 10-12% of the mass of the pulp, and the dosage of the modified carbon fiber is 1-3% of the mass of the pulp.

Technical Field

A manufacturing method of conductive fiber is used for weaving conductive fabric, belonging to the field of conductive fiber.

Background

The conductive fiber is a chemical fiber, a metal fiber, a carbon fiber, or the like spun by mixing a conductive medium into a polymer. Has excellent static eliminating and preventing performance far higher than that of antistatic fiber, and has lasting specific resistance value and no influence of humidity. The conductive material is classified into a uniform type, a coated type and a composite type according to the distribution state of the conductive components. The fiber is generally prepared by adding conductive media such as carbon black, graphite, metal powder or metal compounds and the like into the fiber by adopting methods such as mixing and dissolving, evaporation, electroplating, composite spinning and the like. The crystal can be shielded by electrostatic induction, and the fabric mixed with a small amount of conductive fiber can be used as special work clothes, dust-proof brushes, etc.

The cellulose fiber is widely used, has good mechanical property and hygroscopicity, and can remarkably reduce the manufacturing cost if the cellulose is adopted to manufacture the conductive fiber.

In the prior art, the technology of mixing the graphene oxide solution with the regenerated cellulose solution and forming by a viscose wet spinning process is very common, but the preparation method brings insufficient fiber bonding degree, is difficult to meet the use requirement, has unstable conductivity and influences the use of conductive fibers, so that the preparation of a novel conductive fiber is necessary to solve the problems.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and aims to overcome the defects that the conductive fiber in the prior art has poor conductivity and low stability and influences the further processing and use of the conductive fiber.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a method for manufacturing conductive fibers comprises the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.2-1.8 by hydrochloric acid to obtain an electrolytic aqueous solution for later use;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 5-6% of that of the toluene;

adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte to be 2-6 ℃, rotating cathode current density to be 18-20A/dm2, electrolytic bath voltage to be 50-60V and electrolyzing for 1.5-2h, collecting upper-layer toluene solution, adding ethanol, reducing the temperature to-10-15 ℃, standing for 2-3h for full precipitation, collecting precipitate, washing for 2-3 times by using purified water, and drying at 100-120 ℃ to obtain silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water with the mass of 20-23 times of that of the carbon fibers, adding perchloric acid with the mass of 1-2% of that of the solution, stirring for 20-26min, centrifugally collecting the carbon fibers, washing with the purified water, drying under reduced pressure at normal temperature, preparing the obtained carbon fibers and benzene into a solution with the mass of 2-3mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 80-85 ℃, magnetically stirring for 20-30min, recovering benzene from the solution under reduced pressure at 60-65 ℃, washing precipitates with ethanol, and drying under reduced pressure to obtain modified carbon fibers;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 20-30min, adding sodium lignosulfonate, adjusting the pH value to 10-11, adjusting the pressure in a squeezer to 5-10KPa, squeezing for 30-40min, controlling the temperature to 23-25 ℃, treating for 15-20min by using ultrasonic waves of 300-500W, reducing the temperature to 20-22 ℃, standing for 30-50min, continuing to perform ultrasonic treatment for 10-15min, increasing the temperature to 28-30 ℃, standing for 20-25min, adding silver nano polymer particles, stirring for 20-30min, adding modified carbon fibers, stirring for 1-2h, and spinning to obtain the fibers.

Specifically, in the step (1), the mass fraction of the silver chloride solution is 3-6%.

Specifically, in the step (1), the mass fraction of lanthanum chloride is 0.1-0.2%.

Specifically, in the step (1), the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 1-2.

Specifically, in the step (1), the amount of the sodium chloride is 1-2% of the mass of the electrolytic aqueous solution.

Specifically, in the step (1), the using amount of the oleic acid is 0.5-1% of the mass of the electrolytic aqueous solution.

Specifically, in the step (1), the using amount of the gelatin is 5-8% of the mass of the electrolytic aqueous solution.

Specifically, in the step (1), the dosage of the chitosan hydrochloride is 0.8-1.2% of the mass of the electrolytic aqueous solution.

Specifically, in the step (3), the dosage of the aminopropyltriethoxysilane is 80-86% of the mass of the carbon fiber.

Specifically, in the step (4), the amount of the sodium lignin sulfonate is 0.3-0.5% of the mass of the pulp; the dosage of the silver nano polymer particles is 10-12% of the mass of the pulp, and the dosage of the modified carbon fiber is 1-3% of the mass of the pulp.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention uses silver chloride and lanthanum chloride to electrolyze in the electrolytic bath to generate silver and lanthanum mixed crystal, when the cathode rotates to the toluene solution, the separated silver lanthanum crystal grain can be dissolved in toluene to be covered by epoxy resin, meanwhile, because gelatin and chitosan hydrochloride are added into the water solution, a macromolecule cross-linking network can be formed on the electrode to enter the toluene solution system, after the epoxy resin is wrapped, the outer surface is further filled by gelatin and chitosan, the molecular group structure on the surface of the epoxy resin is improved, the prepared silver nano polymer particle can not agglomerate, and further can be dispersed and cross-linked with subsequent fiber to form a complete and uniform silver particle system. And the addition of lanthanum can not only improve the strength of silver particles, but also promote the molecular chain closure of the epoxy resin to form a high-strength shell, ensure the adhesion of silver ions in the fiber, reduce the loss of the silver ions, and improve the conductivity and the strength of the fiber.

(2) According to the invention, the carbon fiber can be more fully oxidized by using strong oxidizability of perchloric acid, the oxidation groups on the surface of the carbon fiber are improved, a compact carboxyl system is formed, then aminopropyltriethoxysilane is introduced, and the carboxyl on the surface of the carbon fiber is combined with the amino in the aminopropyltriethoxysilane to form long molecular chains on the surface of the carbon fiber, so that the connecting capability of the carbon fiber and the following fiber pulp is improved, and the aminopropyltriethoxysilane molecular chains can be crosslinked with silver nano polymer particles to improve the crystal density of the fiber system, so that the prepared lead fiber has higher strength and stronger conductivity.

Detailed Description

Example 1:

a method for manufacturing conductive fibers comprises the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.2 by hydrochloric acid to obtain an electrolytic aqueous solution for later use; the mass fraction of the silver chloride solution is 3%, the mass fraction of the lanthanum chloride is 0.1%, and the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 1; the using amount of the sodium chloride is 1% of the mass of the electrolytic aqueous solution, the using amount of the oleic acid is 0.5% of the mass of the electrolytic aqueous solution, the using amount of the gelatin is 5% of the mass of the electrolytic aqueous solution, and the using amount of the chitosan hydrochloride is 0.8% of the mass of the electrolytic aqueous solution;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 5% of that of the toluene; adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte to be 2 ℃ and the rotating cathode current density to be 18A/dm²Electrolyzing for 1.5h at 50V in an electrolytic bath, collecting upper-layer toluene solution, adding ethanol, reducing the temperature to-10 ℃, standing for 2h for sufficient precipitation, collecting precipitate, washing with purified water for 2 times, and drying at 100 ℃ to obtain silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water with the mass of 20 times that of the carbon fibers, adding perchloric acid with the mass of 1% of the solution, stirring for 20min, centrifugally collecting the carbon fibers, washing with the purified water, drying at normal temperature under reduced pressure, preparing the obtained carbon fibers and benzene into a solution with the mass of 2mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 80 ℃, magnetically stirring for 20min, recovering benzene from the solution at 60 ℃ under reduced pressure, washing precipitates with ethanol, and drying under reduced pressure to obtain modified carbon fibers; the using amount of the aminopropyltriethoxysilane is 80% of the mass of the carbon fiber;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 20min, adding sodium lignosulfonate, adjusting the pH value to 10, adjusting the pressure in a squeezer to be 5KPa, squeezing for 30min, controlling the temperature to be 23 ℃, performing ultrasonic treatment with 300W for 15min, reducing the temperature to 20 ℃, standing for 30min, continuing the ultrasonic treatment for 10min, increasing the temperature to 28 ℃, standing for 20min, adding silver nano polymer particles, stirring for 20min, adding modified carbon fibers, stirring for 1h, and spinning to obtain the fibers; the dosage of the sodium lignin sulfonate is 0.3 percent of the mass of the pulp; the dosage of the silver nano polymer particles is 10% of the mass of the pulp, and the dosage of the modified carbon fiber is 1% of the mass of the pulp.

Example 2:

a method for manufacturing conductive fibers comprises the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.8 by hydrochloric acid to obtain an electrolytic aqueous solution for later use;

the mass fraction of the silver chloride solution is 6%, the mass fraction of the lanthanum chloride is 0.2%, and the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 2; the using amount of the sodium chloride is 2% of the mass of the electrolytic aqueous solution, the using amount of the oleic acid is 1% of the mass of the electrolytic aqueous solution, the using amount of the gelatin is 8% of the mass of the electrolytic aqueous solution, and the using amount of the chitosan hydrochloride is 1.2% of the mass of the electrolytic aqueous solution;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 6% of that of the toluene; adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte to be 6 ℃ and the rotating cathode current density to be 20A/dm²Electrolyzing at 60V for 2 hr, collecting upper layer toluene solution, adding ethanol, cooling to-15 deg.C, standing for 3 hr for full precipitation, collecting precipitate, washing with purified water for 3 times, and oven drying at 120 deg.CObtaining silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water 23 times of the mass of the carbon fibers, adding perchloric acid 2% of the mass of the solution, stirring for 26min, centrifugally collecting the carbon fibers, washing with the purified water, drying at normal temperature under reduced pressure, preparing the obtained carbon fibers and benzene into a solution of 3mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 85 ℃, magnetically stirring for 30min, recovering benzene from the solution at 65 ℃ under reduced pressure, washing the precipitate with ethanol, and drying under reduced pressure to obtain modified carbon fibers; the using amount of the aminopropyltriethoxysilane is 86% of the mass of the carbon fiber;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 30min, adding sodium lignosulfonate, adjusting the pH value to 11, adjusting the pressure in a squeezer to 10KPa, squeezing for 40min, controlling the temperature to 25 ℃, treating with 500W ultrasonic waves for 20min, reducing the temperature to 22 ℃, standing for 50min, continuing ultrasonic treatment for 15min, increasing the temperature to 30 ℃, standing for 25min, adding silver nano polymer particles, stirring for 30min, adding modified carbon fibers, stirring for 2h, and spinning to obtain the fibers; the dosage of the sodium lignin sulfonate is 0.5 percent of the mass of the pulp; the dosage of the silver nano polymer particles is 12% of the mass of the pulp, and the dosage of the modified carbon fiber is 3% of the mass of the pulp.

Example 3

A method for manufacturing conductive fibers comprises the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.5 by hydrochloric acid to obtain an electrolytic aqueous solution for later use;

the mass fraction of the silver chloride solution is 5%, the mass fraction of the lanthanum chloride is 0.15%, and the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 1.3; the using amount of the sodium chloride is 1.2 percent of the mass of the electrolytic aqueous solution, the using amount of the oleic acid is 0.51 percent of the mass of the electrolytic aqueous solution, the using amount of the gelatin is 5.8 percent of the mass of the electrolytic aqueous solution, and the using amount of the chitosan hydrochloride is 0.82 percent of the mass of the electrolytic aqueous solution;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 5.6 percent of that of the toluene; adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte to be 5 ℃, the rotating cathode current density to be 19A/dm2, the voltage of the electrolytic bath to be 60V, electrolyzing for 1.5h, collecting the upper layer toluene solution, adding ethanol, reducing the temperature to-15 ℃, standing for 2h for full precipitation, collecting the precipitate, washing for 3 times by using purified water, and drying at 100 ℃ to obtain silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water 23 times of the mass of the carbon fibers, adding perchloric acid 2% of the mass of the solution, stirring for 26min, centrifugally collecting the carbon fibers, washing with the purified water, drying at normal temperature under reduced pressure, preparing the obtained carbon fibers and benzene into a solution of 2mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 80 ℃, magnetically stirring for 20min, recovering benzene from the solution at 60 ℃ under reduced pressure, washing the precipitate with ethanol, and drying under reduced pressure to obtain modified carbon fibers; the using amount of the aminopropyltriethoxysilane is 86% of the mass of the carbon fiber;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 30min, adding sodium lignosulfonate, adjusting the pH value to 11, adjusting the pressure in a squeezer to be 5KPa, squeezing for 30min, controlling the temperature to be 25 ℃, treating for 15min by using 500W ultrasonic waves, reducing the temperature to be 22 ℃, standing for 30min, continuing ultrasonic treatment for 15min, increasing the temperature to be 28 ℃, standing for 25min, adding silver nano polymer particles, stirring for 30min, adding modified carbon fibers, stirring for 1h, and spinning to obtain the fibers; the dosage of the sodium lignin sulfonate is 0.5 percent of the mass of the pulp; the dosage of the silver nano polymer particles is 10% of the mass of the pulp, and the dosage of the modified carbon fiber is 3% of the mass of the pulp.

Example 4

A method for manufacturing conductive fibers comprises the following steps:

(1) preparing nano silver electrolytic solution

Dissolving silver chloride into distilled water to obtain a silver chloride solution for later use; dissolving lanthanum chloride into distilled water to obtain a lanthanum chloride solution for later use; pouring a silver chloride solution and a lanthanum chloride solution into a rotary electrolytic tank, adding sodium chloride, oleic acid, gelatin and chitosan hydrochloride, stirring until the sodium chloride, the oleic acid, the gelatin and the chitosan hydrochloride are dissolved, and adjusting the pH of the aqueous solution to 1.79 by using hydrochloric acid to obtain an electrolytic aqueous solution for later use;

the mass fraction of the silver chloride solution is 6%, the mass fraction of the lanthanum chloride is 0.1%, and the mass ratio of the silver chloride solution to the lanthanum chloride solution is 10: 1.55; the using amount of the sodium chloride is 2% of the mass of the electrolytic aqueous solution, the using amount of the oleic acid is 1% of the mass of the electrolytic aqueous solution, the using amount of the gelatin is 5% of the mass of the electrolytic aqueous solution, and the using amount of the chitosan hydrochloride is 0.8% of the mass of the electrolytic aqueous solution;

adding toluene into the epoxy resin for dissolving to obtain a toluene solution; the mass of the epoxy resin is 6% of that of the toluene; adding a toluene solution into a rotary electrolytic cell; the volume ratio of the toluene solution to the electrolytic aqueous solution is 1: 2;

(2) preparation of silver Nano Polymer particles

Controlling the temperature of the electrolyte to be 6 ℃, the rotating cathode current density to be 18A/dm2, the voltage of the electrolytic bath to be 60V, electrolyzing for 2h, collecting the upper layer toluene solution, adding ethanol, reducing the temperature to-10 ℃, standing for 2h for full precipitation, collecting the precipitate, washing for 2 times by using purified water, and drying at 100 ℃ to obtain silver nano polymer particles;

(3) preparation of modified carbon fiber

Mixing carbon fibers with purified water with the mass of 20 times that of the carbon fibers, adding perchloric acid with the mass of 1% of the solution, stirring for 20min, centrifugally collecting the carbon fibers, washing with the purified water, drying at normal temperature under reduced pressure, preparing the obtained carbon fibers and benzene into a solution with the mass of 2mg/ml, adding aminopropyltriethoxysilane into the solution, heating to 85 ℃, magnetically stirring for 30min, recovering benzene from the solution at 65 ℃ under reduced pressure, washing precipitates with ethanol, and drying under reduced pressure to obtain modified carbon fibers; the using amount of the aminopropyltriethoxysilane is 83% of the mass of the carbon fiber;

(4) preparation of conductive fibers

Placing the viscose filament pulp into a high-speed stirrer, stirring for 30min, adding sodium lignosulfonate, adjusting the pH value to 10, adjusting the pressure in a squeezer to 10KPa, squeezing for 30min, controlling the temperature to 25 ℃, treating with 500W ultrasonic waves for 20min, reducing the temperature to 22 ℃, standing for 50min, continuing ultrasonic treatment for 15min, increasing the temperature to 28 ℃, standing for 25min, adding silver nano polymer particles, stirring for 30min, adding modified carbon fibers, stirring for 2h, and spinning to obtain the fibers; the dosage of the sodium lignin sulfonate is 0.5 percent of the mass of the pulp; the dosage of the silver nano polymer particles is 10% of the mass of the pulp, and the dosage of the modified carbon fiber is 3% of the mass of the pulp.

In order to verify the technical scheme of the invention, the following comparative examples are designed:

comparative example 1	The difference from example 1 is that no lanthanum chloride solution was used in step (1);
		comparative example 2	The difference from example 1 is that chitosan hydrochloride was not used in step (1);
comparative example 3	The difference from example 1 is that perchloric acid is replaced by nitric acid in step (3);
		comparative example4	The difference from example 1 is that aminopropyltriethoxysilane was not used in step (3);
comparative example 5	The difference from example 1 is that sodium lignosulfonate was not used in step (4).

Test examples

Conductive fibers were produced according to examples 1 to 4 and comparative examples 1 to 5, respectively, and the conductive fibers were examined for dry crack strength and volume conductivity, and the results were as follows:

	crack strength cN/dtex	Bulk conductivity x 10-6S/cm
			Example 1	2.94	4.12
Example 2	2.88	4.35
			Example 3	2.91	4.31
Example 4	2.86	4.22
			Comparative example 1	1.63	3.84
Comparative example 2	1.75	3.87
			Comparative example 3	1.69	3.73
Comparative example 4	1.71	3.68
			Comparative example 5	1.79	3.79

As can be seen from the table, the conductive fiber prepared by the method has higher dry cracking strength, larger volume conductivity and more excellent performance.