CN114855296A - High-conductivity wool top fiber and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of fiber products, and particularly discloses a high-conductivity wool top fiber and a preparation method thereof. The high-conductivity wool top fiber comprises a skin layer and a core layer, and the skin layer and the core layer form a core-offset skin-core structure; the core layer is prepared from the following raw materials: polyamide-6, polymer-coated carbon nanotubes, a dispersant, a lubricant and a compatibilizer; the skin layer is prepared from the following raw materials: polyamide-6, a conductive polymer and 4-dodecyl benzene sulfonate ions. The preparation method of the high-conductivity wool top fiber comprises the following steps: the raw materials of the core layer and the skin layer are respectively mixed, extruded and compositely spun to prepare wool top fibers. This application is through improving the electric conductivity of sandwich layer and cortex respectively for the wool top fibre that obtains has excellent electric conductivity.

Description

High-conductivity wool top fiber and preparation method thereof

Technical Field

The application relates to the technical field of fiber products, in particular to a high-conductivity wool top fiber and a preparation method thereof.

Background

The accumulation of static electricity is inevitable, the skin of a person is burnt when the static electricity is serious, and the endocrine system of the person is dried when electromagnetic waves and harmful rays of various electric appliances are excessive. With the improvement of the living standard of people and the enhancement of the awareness of environmental protection, various static electricity watching products have been developed to prevent the static electricity interference. Especially, the conductive clothing made of the conductive wool top fiber has the functions of electric conduction, heat conduction, shielding, electromagnetic wave absorption and the like, and is widely applied to the aspects of conductive nets in the electronic and power industries, antistatic clothing, electric heating clothing and electric heating bandages in the medical industry, electromagnetic shielding covers in the aerospace, aviation and precision electronic industries and the like.

The conductive wool top fiber is prepared by adopting a blending spinning method, namely conductive particles are directly added into a matrix polymer to carry out direct spinning, or the conductive particles and the matrix polymer are carried out composite spinning to prepare the conductive wool top fiber. However, the interface bonding between the conductive particles and the matrix polymer is poor, so that the conductivity of the wool top fiber is poor.

In view of the above-mentioned related art, the inventors consider that the conductive wool top fiber prepared by the blend spinning method has a problem of undesirable conductivity, thus limiting the use and development thereof.

Disclosure of Invention

In order to improve the conductivity of the wool top fiber, the application provides a high-conductivity wool top fiber and a preparation method thereof.

In a first aspect, the application provides a high-conductivity wool top fiber, which adopts the following technical scheme:

a high-conductivity wool top fiber comprises a skin layer and a core layer, wherein the skin layer and the core layer form a core-offset skin-core structure; the core layer is prepared from the following raw materials in parts by weight: polyamide-640-60 parts, polymer-coated carbon nanotubes 30-50 parts, a dispersant 1-2 parts, a lubricant 1-2 parts and a compatilizer 1-2 parts; the skin layer is prepared from the following raw materials in parts by weight: 650-70 parts of polyamide-650, 20-40 parts of conductive polymer and 10-20.5 parts of 4-dodecyl benzene sulfonate ions.

By adopting the technical scheme, the carbon nano tube has large specific surface area, is easy to agglomerate and has poor dispersibility in a high polymer material, so that the dispersibility of the carbon nano tube in the polyamide-6 high polymer material and the interface bonding capability with the high polymer material are enhanced by carrying out polymer coating modification on the carbon nano tube, thereby improving the conductivity of the core layer;

4-dodecyl benzene sulfonate ions with larger volume, complex spatial structure and large steric hindrance and a conductive polymer are doped in the cortex, namely ions in the 4-dodecyl benzene sulfonate ions carry out peroxidation on a main chain of the conductive polymer, so that the conductive polymer is positively charged, and in order to maintain electric neutrality, the negatively charged 4-dodecyl benzene sulfonate ions also enter the main chain of the polymer, so that the main chain of the whole polymer is neutral, and the conductive polymer is changed into a conductive state through the doping process, thereby improving the conductive performance of the cortex;

the core layer and the skin layer of the composite wool top fiber are both made of polyamide-6 as a main raw material, so that the core layer and the skin layer are good in compatibility and tight in combination, and the polyamide-6 has the advantages of being small in density, light in fabric, good in elasticity, resistant to fatigue damage and the like, and meanwhile, the core layer and the skin layer are both good in conductivity, so that the composite wool top fiber has excellent characteristics of being good in conductivity, good in elasticity and the like.

Preferably, the preparation method of the polymer-coated carbon nanotube comprises the following steps: carrying out ultrasonic treatment on the dried carbon nano tube and strong oxidizing acid, heating for reaction, carrying out suction filtration by using a filter membrane, repeatedly washing to be neutral, and carrying out vacuum drying to obtain an amphiphilic carbon nano tube; mixing the amphiphilic carbon nano tube with a polymer, and dispersing into water to obtain a solute; and adding chloroform into the dissolved substance, standing for layering after ultrasonic treatment, collecting a carbon nano tube sample on an interface, cleaning with methanol, and drying to obtain the polymer-coated carbon nano tube.

By adopting the technical scheme, the surface of the carbon nano tube is treated to have amphiphilic performance, so that the carbon nano tube has affinity effect on polar and nonpolar substances; when the carbon nano tube is added into the solution of the polymer, a layer of polymer molecules is adsorbed on the carbon nano tube due to the extremely strong adsorption capacity of the carbon nano tube, when another incompatible solvent is added, the amphiphilic carbon nano tube can be gathered at a two-phase interface through mechanical oscillation, and the polymer molecules can only be wound on the carbon nano tube to form the carbon nano tube wrapped by the polymer thin layer.

Preferably, the polymer is one of polyamide, polyaniline and polyacrylonitrile.

Preferably, the conductive polymer is made from EDOT by oxidative polymerization.

By adopting the technical scheme, PEDOT polymerized by EDOT has the advantages of low energy gap, low electrochemical doping point position, short response time, high color change contrast, good stability and the like, the main chain of the PEDOT has a conjugated main electron system, a radio station can be reached by doping, the conductivity of the PEDOT is improved, and the conductivity of a cortex is improved.

Preferably, the 4-dodecylbenzene sulfonate ion is a mixed solution of iron 4-dodecylbenzene sulfonate and 4-dodecylbenzene sulfonate, and the mass ratio of the iron 4-dodecylbenzene sulfonate ion to the 4-dodecylbenzene sulfonate ion is (1-40): 1.

by adopting the technical scheme, EDOT is mixed with ferric 4-dodecylbenzene sulfonate, PEDOT polymerized by EDOT does not have charges, ferric ions in a reaction system continuously oxidize partial atoms in a polymer to enable the atoms to have positive charges, and then 4-dodecylbenzene sulfonate ions are doped into a conductive high molecular polymer to form a high-conductivity conductive polymer, the doping process of the 4-dodecylbenzene sulfonate ions forms a conductive high molecular material, and the conductivity of a skin layer is improved under the combined action of the conductive high molecular material and polyamide-6; and the electric conductivity of the conductive polymer is more excellent by optimizing the mass ratio of the iron 4-dodecylbenzene sulfonate to the 4-dodecylbenzene sulfonate.

Preferably, the dispersant is a mixture of EVA-3 wax powder, vinyl acetate copolymer wax and diffusion oil, and the mass ratio of the EVA-3 wax powder to the diffusion oil is 1: (1-3).

By adopting the technical scheme, the dispersing agent simultaneously has two surfactants with opposite properties of lipophilicity and hydrophilcity, so that the compatibility of organic matters and inorganic matters in the high-conductivity wool top fiber is better; and the quality ratio of the EVA-3 wax powder vinyl acetate copolymer wax to the diffusion oil is controlled, so that the formed dispersing agent has better effect.

Preferably, the compatilizer is one of PE-g-ST, PP-g-ST and ABS-g-MAH.

By adopting the technical scheme, the PE-g-ST, the PP-g-ST and the ABS-g-MAH can promote incompatible polymers to be combined together by virtue of intermolecular bonding force, so that a stable blend is obtained, the compatibility of the composite material and the dispersibility of the filler can be greatly improved, and the mechanical strength of the core layer is improved.

Preferably, the lubricant is one of calcium stearate, zinc stearate and magnesium stearate.

By adopting the technical scheme, the calcium stearate, the zinc stearate and the magnesium stearate have good lubricating property and good light and heat stabilizing effects, and the composite material can be prevented from being coked in the processing process.

In a second aspect, the present application provides a method for preparing a high-conductivity wool top fiber, which adopts the following technical scheme: a preparation method of high-conductivity wool top fiber comprises the following steps:

respectively mixing and drying the core layer raw material and the outer layer raw material in corresponding parts by weight to form a core layer mixture and an outer layer;

extruding the core layer mixture to form a core layer mixed melt;

extruding the outer layer mixture to form an outer layer mixed melt;

the core layer mixed melt and the outer layer mixed melt are respectively metered and then input into a spinning main box body, are sprayed out from a spinneret orifice through a composite spinning assembly, and spinning filament yarns are cooled, oiled, wound, drawn and shaped to prepare fiber tows, and then are cut by a wool top slivering machine and then are slitted to form wool top fibers after being thinned.

By adopting the technical scheme, the preparation method of the high-conductivity wool top fiber is simple in process and low in cost.

Preferably, the temperature of the cooling air for the filament is 20-25 ℃, the wind speed is 1.8-2.1m/s, and the humidity is 65-70%.

By adopting the technical scheme, the wool top fiber can be better prepared by optimizing each parameter of the cooling air of the yarn strips during cooling.

In summary, the present application has the following beneficial effects:

1. according to the preparation method, the polymer is added into the core layer to coat the carbon nano tube, so that the dispersibility of the carbon nano tube in polyamide-6 and the interface bonding capability with a high polymer material are enhanced, and the conductivity of the core layer is improved; meanwhile, the conductive polymer is doped by 4-dodecyl benzene sulfonate ions in the cortex, so that the conductivity of the conductive polymer is improved, and the conductivity of the cortex is further improved; therefore, the wool top fiber of the eccentric structure formed by the skin layer and the core layer has excellent conductivity;

2. the polymer-coated carbon nanotube prepared in the application has a simple preparation process, and the polymer of the product is uniformly coated, so that the dispersibility of the carbon nanotube in a high polymer material and the cross-section bonding capability of the carbon nanotube and the high polymer material are enhanced, and the conductivity of a core layer is enhanced;

3. according to the method, the doping property of the 4-dodecylbenzene sulfonate ions to the conductive polymer is improved by optimizing the mass ratio of the 4-dodecylbenzene ferric sulfonate to the 4-dodecylbenzene sulfonic acid, so that the conductivity of the conductive polymer is improved, and further the conductivity of the cortex is improved.

Detailed Description

The present application is described in further detail below with reference to preparation examples and examples.

Among the relevant raw materials used in the preparation examples and examples:

polyamide-6, available from Boxin Longjing, Inc., under the designation A3HG 6; the carbon nano tube has the raw material trade name of 308068-56-6, and is purchased from the Youwei New materials Co., Ltd, Dongguan; the polyamide is 45HSB and is purchased from high-creation plastic raw materials Co.Ltd in Dongguan city; the chloroform brand is 865-49-6, purchased from Hubei Shineng chemical technology Co., Ltd; methanol with the mark of 67-56-1 is purchased from chemical company Limited of Minam's Chuangshi; polyaniline CAS: 25233-30-2, polyacrylonitrile CAS: 25014-41-9, all available from Guangdong Wengjiang chemical reagents, Inc.; the product number of the polyether type polyester elastomer is 990R, and the polyether type polyester elastomer is purchased from Jiangsu HongshongKuang import and export limited company; EDOT No. 126213-450-1, available from Kao chemical technology, Inc., North Hu; ferric 4-dodecylbenzenesulfonate and 4-dodecylbenzenesulfonate were purchased from Minam for chemical industry, Inc.; EVA-3 wax powder vinyl acetate copolymer wax and spreading oil are available from New materials, Inc. of Kyoto, Guangzhou; PE-g-ST, PP-g-ST and ABS-g-MAH were purchased from Suzhou continuos materials, Inc.; calcium stearate, zinc stearate and magnesium stearate were purchased from shijiazhuang sandingpeng chemical limited.

Preparation example

Preparation example 1

The following description will be made by taking preparation example 1 as an example. The preparation example discloses a preparation method of a polymer coated carbon nanotube, which comprises the following steps:

s10, adding 2g of dry carbon nano raw material and 20mL of 60% nitric acid into a flask with a magnetic stirring rotor, treating the mixture for 30min by using 40kHZ ultrasonic waves, heating the mixture to 120 ℃, stirring the mixture, reacting the mixture for 24h under reflux, performing suction filtration by using a polytetrafluoroethylene microporous filter membrane with the diameter of 0.25 mu m, repeatedly washing the mixture for multiple times to be neutral by using deionized water, and performing vacuum drying at 80 ℃ for 24h to obtain 1.5g of amphiphilic carbon nano tube;

s20, weighing 1g of polyamide, adding into a test tube, adding 20mL of chloroform, dissolving, adding 0.05g of amphiphilic carbon nanotube, shaking violently, and keeping for 2h under stirring;

and S30, adding 20mL of deionized water, violently shaking, carrying out ultrasonic treatment for 10min, standing for layering, collecting a carbon nano tube sample on the cross section, washing with methanol, and drying to obtain the polymer-coated carbon nano tube.

Preparation example 2

This preparation is essentially the same as preparation 1, except that: the polyamide in step S20 was replaced with polyaniline.

Preparation example 3

This preparation is essentially the same as preparation 1, except that: the polyamide in step S20 was replaced with polyacrylonitrile.

Examples

Examples 1 to 8

As shown in Table 1, examples 1 to 8 are different in the ratio of the raw materials for the core layer.

The following description will be given by taking example 1 as an example. The embodiment of the application discloses a high-conductivity wool top fiber which comprises a skin layer and a core layer, wherein the skin layer and the core layer form a core-offset skin-core structure; wherein the core layer is prepared by using polyamide-640 Kg, polymer coated carbon nano-tubes 30Kg, EVA-3 wax powder vinyl acetate copolymer wax 0.5Kg, diffusion oil 0.5Kg, PE-g-STkg and calcium stearate 1Kg as raw materials, and the polymer coated carbon nano-tubes are obtained by the preparation example 1; the skin layer is prepared by using polyamide-650 kg, conductive polymer 20kg, 4-dodecyl benzene sulfonic acid iron 5kg and 4-dodecyl benzene sulfonic acid 5kg as raw materials.

The embodiment also discloses a preparation method of the high-conductivity wool top fiber, which comprises the following specific steps:

s1, weighing the raw materials of the core layer and the skin layer according to the formula, mixing and drying: respectively and uniformly mixing the raw materials of the core layer and the skin layer by using a stirrer, and then respectively drying by using vacuum drying equipment until the water content of each raw material of the core layer and the skin layer is lower than 2.5%, wherein the drying temperature is 145-150 ℃, and the drying time is 20-24 h:

s2, feeding the obtained core layer mixture into a double-screw extruder to melt the core layer mixture melt, wherein the heating section of the double-screw extruder is divided into five sections, and the heating temperature is 200-;

s3, feeding the obtained skin layer mixture into a double-screw extruder to melt the skin layer mixture melt, wherein the heating section of the double-screw extruder is divided into five sections, and the heating temperature is 215-; s4, weighing the core layer mixed melt and the skin layer mixed melt according to the same mass, inputting the weighed core layer mixed melt and the skin layer mixed melt into a spinning main box, spraying the core layer mixed melt and the skin layer mixed melt from a spinneret orifice through a composite spinning assembly to form a skin-biased core structure, wherein the composite spinning temperature is 290 ℃, the pressure of the spinning assembly is 20Pma, cooling, oiling, winding, drafting and shaping the spinning strand silk to prepare fiber tows, then cutting the fiber tows through a wool top forming machine, forming the fiber tows into strips through needle carding, and supporting the wool tops with different lengths; during cooling, the temperature of cooling air of the strand silk is 20 ℃, the air speed is 1.8m/s, the humidity is 70%, the primary stretching is 2.5 times, the secondary stretching is 1.3 times, the primary water bath stretching is 70 ℃, the secondary water bath stretching is 85 ℃, the heat setting temperature is 130 ℃, and the setting time is 35 min; the average length of the cut is 90mm, the drafting in the slivering process is 10 times, the drafting of the secondary needle carding process is 6.5 times, and the pelletizing drafting is 7 times.

Table 1 examples 1-8 of the composition of each raw material of the middle core layer of the high conductivity wool top fiber

Example 9

The present example differs from example 1 in that in the step S4, the temperature of the yarn during cooling was 25 ℃, the wind speed was 2.1m/S, and the humidity was 65%.

The main difference between examples 10-15 is the different ratios of the raw materials in the skin layer, as shown in Table 2.

TABLE 2 proportioning of raw materials for middle and skin layers of high conductivity wool top fiber in examples 10-15

Example 16

This example is substantially the same as example 1, except that the polymer-coated carbon nanotubes in the core layer were obtained using preparation example 2.

Example 17

This example is substantially the same as example 1, except that the polymer-coated carbon nanotubes in the core layer were obtained using preparation example 3.

Example 18

This example is substantially the same as example 1 except that PE-g-ST and calcium stearate in the skin layer are replaced with PP-g-ST and zinc stearate.

Example 19

This example is substantially the same as example 1 except that PE-g-ST and calcium stearate in the skin layer are replaced with ABS-g-MAH and magnesium stearate.

Comparative example

Comparative example 1

This comparative example is different from example 1 in that the polymer-coated carbon nanotubes are replaced with carbon nanotubes.

Comparative example 2

This comparative example is different from example 1 in that the amount of the polymer-coated carbon nanotube added was 60 kg.

Comparative example 3

This comparative example is different from example 1 in that the addition amounts of the conductive polymer, iron 4-dodecylbenzenesulfonate and 4-dodecylbenzenesulfonic acid were all 0.

Comparative example 4

This example is different from example 1 in that the amount of the conductive polymer added was 30 kg.

Performance test

The same weight of the highly conductive top fiber obtained in examples 1 to 19 was used as test samples 1 to 15, and the same weight of the highly conductive top fiber obtained in comparative examples 1 to 4 was used as control samples 1 to 4. The test sample and the control sample were subjected to conductivity test, and the results are shown in Table 3.

The high-conductivity top fiber was cut to 10cm, the both ends were clamped by a card type probe of a milliohm meter, the resistance value was removed, and the average value was determined 5 times.

TABLE 3 Performance test data sheet

Referring to table 3, in combination with examples 1 to 3 and 10 to 11, it can be seen that as the content of polyurethane-6 in the core layer and the skin layer is increased, the ratio of the conductive materials (polymer-coated carbon nanotubes and conductive polymer) in the core layer and the skin layer in the high-conductivity batt fiber is relatively decreased, so that the conductivity of the sample is decreased.

Referring to table 3, in combination with examples 2, 4, 5 and comparative examples 1 to 2, it can be seen that the conductivity of the sample tends to increase as the content of the polymer-coated carbon nanotube increases, but the resistance value of the sample tends to be stable when an excessive amount of the polymer carbon nanotube is added (comparative example 2); when the carbon nano tube (comparative example 1) is used as a conductive substance and is directly added into the core layer of the high-conductivity wool top fiber, the conductivity of the sample is in a descending trend, which shows that the antibacterial property of the chitosan can be improved after the micro-nano treatment is carried out on the chitosan; the polymer coating modification of the carbon nano tube is shown to enhance the dispersibility of the carbon nano tube in the polyurethane-6 high polymer material and the interface bonding capability with the high polymer material, so that the conductivity of the core layer is improved, and the conductivity effect of the high-conductivity wool top fiber is improved.

Referring to table 3, in combination with examples 4, 6 and 7, it can be seen that by varying the mass ratio between the EVA-3 wax powder vinyl acetate copolymer wax and the diffusion oil within a suitable range, the obtained samples all have good conductivity; particularly, when the mass ratio of the EVA-3 wax powder vinyl acetate copolymer wax to the diffusion oil is 1:2, the conductivity of the sample is optimal.

Referring to Table 3, in combination with examples 6 and 8, it can be seen that by varying the amounts of PE-g-S and calcium stearate added within appropriate ranges, the prepared sample still has excellent conductive properties.

Referring to table 3, in combination with examples 1 and 9, it can be seen that the highly conductive batt fiber prepared by varying each parameter in the cooling of the yarn in an appropriate range in the preparation method has high conductivity.

Referring to table 3, in combination with examples 10, 12, 13 and comparative examples 3 to 4, it can be seen that as the content of the conductive polymer in the skin layer is increased, the conductivity of the sample tends to increase first and then decrease; when the content of the added conductive polymer is proper relative to the content of the 4-dodecylbenzene sulfonate ions, ferric ions are facilitated to oxidize the polymer to form a good conductive high molecular material, and the content of the conductive polymer influences the doping degree of the 4-dodecylbenzene sulfonate ions, so that the conductivity of the cortex is influenced by different degrees.

Referring to table 3, in conjunction with examples 12, 14 and 15, it can be seen that, when the mass ratio of the iron 4-dodecylbenzenesulfonate to the 4-dodecylbenzenesulfonate is changed to 20:1, the conductivity of the sample is optimized, because the addition of a proper amount of the 4-dodecylbenzenesulfonate to the skin layer facilitates the control of the molar amount of ferric ions and the molar amount of the 4-dodecylbenzenesulfonate ions in the reaction system, so that the 4-dodecylbenzenesulfonate ions have a better doping effect on the conductive polymer, and the conductivity of the high-conductivity top wool fiber is improved.

Referring to table 3, in combination with examples 1, 16 and 17, it can be seen that when the polymer, namely polyurethane, is replaced by polyaniline or polyacrylonitrile when preparing the polymer-coated carbon nanotubes, the conductivity of the sample is reduced to a different extent, because the conductivity of the obtained wool top fiber is better because the polymer obtained by coating and modifying the carbon nanotubes with polyurethane-6, which is the main material in the core layer, is better than the polymer obtained by coating and modifying the carbon nanotubes with polyurethane.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. A high-conductivity wool top fiber is characterized in that: the core-skin structure comprises a skin layer and a core layer, wherein the skin layer and the core layer form a core-skin structure; the core layer is prepared from the following raw materials in parts by weight: polyamide-640-60 parts, polymer-coated carbon nanotubes 30-50 parts, a dispersant 1-2 parts, a lubricant 1-2 parts and a compatilizer 1-2 parts; the skin layer is prepared from the following raw materials in parts by weight: 650-70 parts of polyamide-70 parts, 20-40 parts of conductive polymer and 10-20.5 parts of 4-dodecyl benzene sulfonate ions.

2. The highly conductive batt fiber according to claim 1, wherein: the preparation method of the polymer coated carbon nano tube comprises the following steps: carrying out ultrasonic treatment on the dried carbon nano tube and strong oxidizing acid, heating for reaction, carrying out suction filtration by using a filter membrane, repeatedly washing to be neutral, and carrying out vacuum drying to obtain an amphiphilic carbon nano tube; mixing the amphiphilic carbon nano tube with a polymer, and dispersing into water to obtain a solute; and adding chloroform into the dissolved substance, standing for layering after ultrasonic treatment, collecting a carbon nano tube sample on an interface, cleaning with methanol, and drying to obtain the polymer-coated carbon nano tube.

3. The highly conductive batt fiber according to claim 2, wherein: the polymer is one of polyamide, polyaniline and polyacrylonitrile.

4. The highly conductive batt fiber according to claim 1, wherein: the conductive polymer is made from EDOT by oxidative polymerization.

5. The highly conductive batt fiber according to claim 1, wherein: the 4-dodecylbenzene sulfonate ions are mixed solution of ferric 4-dodecylbenzene sulfonate and 4-dodecylbenzene sulfonate, and the mass ratio of the ferric 4-dodecylbenzene sulfonate ions to the dodecylbenzene sulfonate ions is (1-40): 1.

6. the highly conductive batt fiber according to claim 1, wherein: the dispersing agent is a mixture of EVA-3 wax powder, vinyl acetate copolymer wax and diffusion oil, and the mass ratio of the EVA-3 wax powder to the diffusion oil is 1: (1-3).

7. The highly conductive batt fiber according to claim 1, wherein: the compatilizer is one of PE-g-ST, PP-g-ST and ABS-g-MAH.

8. The highly conductive batt fiber according to claim 1, wherein: the lubricant is one of calcium stearate, zinc stearate and magnesium stearate.

9. The method for preparing the highly conductive batt fiber according to any of claims 1 to 8, characterized in that: the method comprises the following steps:

respectively mixing and drying the core layer raw materials and the skin layer raw materials in corresponding parts by weight to form a core layer mixture and a skin layer;

extruding the core layer mixture to form a core layer mixed melt;

extruding the skin layer mixture to form a skin layer mixed melt;

the core layer mixed melt and the skin layer mixed melt are respectively metered and then input into a spinning main box body, are sprayed out from a spinneret orifice through a composite spinning assembly, and spinning filament yarns are cooled, oiled, wound, drawn and shaped to prepare fiber tows, and then are cut by a wool top slivering machine and then are slitted to form wool top fibers after being thinned.

10. The method for preparing high-conductivity wool top fiber according to claim 9, wherein: the temperature of the strand cooling air is 20-25 deg.C, the wind speed is 1.8-2.1m/s, and the humidity is 65-70%.