KR102406888B1 - Manufacturing method of nano carbon fiber protective clothing and protective clothing thereof - Google Patents

Abstract

The nano-carbon fiber protective clothing manufacturing method of the present invention comprises the steps of preparing a spinning solution using PAN as a precursor and DMF as a solution; forming a nanofiber filter by electrospinning the spinning solution; stabilizing the nanofiber filter in an air atmosphere at 180-200°C; Forming a nano-carbon fiber filter comprising; carbonization step of performing the stabilized nano-fiber filter in a 400 ~ 1000 ℃ region under a nitrogen atmosphere;
Constructed by immersing the nano-carbon fiber filter in a functional nano material to attach the functional nano material to the nano-carbon fiber filter, wherein the functional nano material is seaweed carbonized powder, tourmaline carbonized powder, Al ₂ O ₃ characterized in that
The nano-carbon fiber protective clothing manufactured by the manufacturing method of the nano-carbon fiber protective clothing of the present invention blocks infrared rays, has abrasion resistance and heat resistance, and has antibacterial, antiviral and anti-mite effects.

Description

Manufacturing method of nano carbon fiber protective clothing and protective clothing thereof

The present invention relates to a method for manufacturing a nano-carbon fiber protective clothing and to the protective clothing.

More specifically, the present invention is to have antiviral properties by forming a small diameter of the nano-carbon fibers, and to have the nano-carbon fibers themselves have antibacterial and far-infrared effects. In addition, the present invention blocks infrared rays, has abrasion resistance and heat resistance, and relates to a method for manufacturing a nano carbon fiber protective clothing for antibacterial and antiviral, and a technology related to the protective clothing.

As a background technology of the present invention, Republic of Korea Patent Registration 10-1683475 "Method for manufacturing a functional nanofiber filter and a functional nanofiber filter manufactured thereby" (hereinafter referred to as "prior art") is a method for manufacturing a functional nanofiber filter and thereby It relates to the manufactured functional nanofiber filter.

In the prior art, a spinning solution is prepared by adding an organic solvent to a polysulfone-based polymer, and the nanofiber filter is formed by electrospinning the spinning solution, and then the nanofiber filter is immersed in a functional nanomaterial dispersion solvent and then dried. , it is possible to manufacture a functional nanofiber filter by performing a process of attaching the functional nanomaterial to the nanofiber filter. In this way, it is possible to easily attach a functional nanomaterial to the surface of the nanofiber, thereby manufacturing a nanofiber filter having various functions.

In addition, as the nanofiber filter is manufactured by using the electrospinning method, the thickness of the thin film and the size of the pores can be easily controlled, so that it can have a high porosity and excellent mechanical strength. In addition, when silver (Ag) nanomaterial is attached, it can have an antibacterial function, so it is possible to improve the filter contamination problem by microorganisms, and reduce energy and filter consumption. The method according to claim 1, comprising the steps of: preparing a spinning solution by adding a polysulfone-based polymer to an organic solvent; forming a nanofiber filter by electrospinning the spinning solution; and

After immersing the electrospun nanofiber filter in a functional nanomaterial dispersion solvent and drying, attaching the functional nanomaterial to the surface of the nanofiber filter as the electrospun nanofiber filter is solidified. It is a method of manufacturing a functional nanofiber filter, characterized in that it comprises.

The prior art uses a polysulfone-based polymer, and there are limitations such as the applied voltage (8-13 kV) and the concentration of the solution (the concentration of the polysulfone-based polymer is 25 to 40% by weight with respect to the organic solvent). As in the present invention, there is a problem in that the diameter of the nano-carbon fiber (300 nm or less) cannot be reached. Due to such a problem, there is a risk that a virus or the like may penetrate in the case of a protective suit.

Republic of Korea Patent Publication No. 10-1683475

It is an object of the present invention to provide a method for manufacturing a nano-carbon fiber protective clothing for manufacturing such that the diameter of the nano-carbon fiber is 300 nm or less, and the protective clothing.

Another object of the present invention is to block infrared rays, have abrasion resistance and heat resistance, and provide a protective suit manufactured by a manufacturing method of far-infrared radiation emitting nano carbon fiber protective clothing for antibacterial, antiviral, and mite-proof.

The nano-carbon fiber protective clothing manufacturing method of the present invention comprises the steps of: preparing a spinning solution using PAN as a precursor and DMF as a solution; forming a nanofiber filter by electrospinning the spinning solution; stabilizing the nanofiber filter in an air atmosphere at 180-200°C; Forming a nano-carbon fiber filter comprising a; carbonization step of carrying out the stabilized nano-fiber filter in the region of 400 ~ 1000 ℃ under a nitrogen atmosphere;

Constructed by immersing the nano-carbon fiber filter in a functional nano material to attach the functional nano material to the nano-carbon fiber filter, wherein the functional nano material is seaweed carbonized powder, tourmaline carbonized powder, Al ₂ O ₃ characterized in that

In addition, in the nano-carbon fiber protective clothing manufacturing method, when the electrospinning is performed in the step of forming a nanofiber filter by electrospinning the spinning solution, the applied voltage is 16 kV; Concentration of the PAN in the step of preparing a spinning solution using PAN as the precursor and DMF as a solution

The degree is characterized in that it is 5 wt%.

In addition, in the nano-carbon fiber protective clothing manufacturing method, the weight ratio of the carbonized seaweed powder, the carbonized tourmaline powder, and the Al ₂ O ₃ is 1:1:1, respectively;

The carbonized seaweed powder and the carbonized tourmaline powder are each 0.7 μm. In addition, nano carbon fiber protective clothing manufactured by the manufacturing method of nano carbon fiber protective clothing.

The nano-carbon fiber protective clothing manufactured by the nano-carbon fiber protective clothing manufacturing method of the present invention has an antiviral effect by making the diameter of the nano-carbon fiber to be 300 nm or less.

In addition, the nano-carbon fiber protective clothing of the present invention blocks infrared rays, has abrasion resistance and heat resistance, and has antibacterial, antiviral and anti-mite effects.

1 is a skin temperature difference due to far-infrared processing of underwear after 30 minutes of undressing.
It's a comparison picture.
2 is a flowchart showing the synthesis process of carbon nanofibers.
3 is a chemical formula for the PAN precursor stabilization process;
4 is a chemical formula for the carbonization process of the stabilized nanofiber.
5 is a cross-sectional surface photograph of alumina nano carbon fibers.
6 is a graph showing the average diameter of carbon nanofibers according to the concentration of PAN.
7 is a graph showing the average diameter of carbon nanofibers according to an applied voltage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a photograph comparing the skin temperature difference due to far-infrared processing of underwear after 30 minutes of undressing, and FIG. 2 is a flowchart showing the synthesis process of carbon nanofibers.

Figure 3 is a chemical formula for the PAN precursor stabilization process, Figure 4 is a chemical formula for the carbonization process of the stabilized nanofiber. 5 is a cross-sectional surface photograph of alumina nano-carbon fibers, and FIG. 6 is a graph of the average diameter of carbon nano-fibers according to the concentration of PAN.

7 is a graph showing the average diameter of carbon nanofibers according to an applied voltage.

Far-infrared rays are a kind of invisible light from the sun and are a kind of electromagnetic wave.

The sun's rays are divided into visible and invisible rays. Infrared rays belong to invisible rays and are classified into near-infrared rays, mid-infrared rays, and far-infrared rays. Solar energy is composed of infrared rays (49%), visible rays (40%), gamma rays/X-rays/ultraviolet rays (11%), and far-infrared rays (1.5%). Among the infrared rays in the range of about 0.75 to 1,000 μm, far infrared rays belonging to the very long wavelength range of 4 to 1,000 μm are only 1.5% in a very small amount, but they are called upbringing rays because they act synthetically and synthetically in the body of living things.

Far-infrared rays are easily absorbed by living things and are known to be beneficial to the human body as they have physiologically active and growth-promoting effects.

In general, in order for an object to radiate far-infrared rays, energy supply from the outside is required in any form, but there are materials that radiate naturally. In most cases, depending on the energy source from the outside, room temperature ceramic fiber products absorb visible light such as sunlight and convert it into far-infrared rays, the ceramic absorbs heat generated in the human body and re-radiates far-infrared rays, and radiates from surrounding objects. It is divided into far-infrared rays and heat that ceramic absorbs and re-radiates far-infrared rays.

Far-infrared rays are used in many fields such as plastics, clothing, housing, food industry, building materials, agriculture and horticulture, livestock, chemical industry, water purification industry, and health maintenance equipment.

The biological effect of far-infrared rays is known to promote blood circulation and activate metabolism. Representative effects of far-infrared rays on the human body are as follows.

(1) The function of maintaining proper body temperature through body temperature regulation as a warming action, (2) The function of promoting growth of immature children and adolescents as a growth promoting action, (3) The function of balancing calcium and iron nutrition in the body as an ion action Strengthening function, (4) optimal moisture retention function to maintain body temperature as a dry and wet action, (5) body waste removal and sweat odor neutralization function as a neutralizing action, (6) a resonance action of the body’s lipid protein and carbohydrate It has the ability to break down nutrients.

In addition to effects such as poor circulation and low back pain, examples of the far-infrared effect include physiological activation and antibacterial, deodorizing, and flame retardant effects due to the negative (-) ion effect.

Far-infrared radiation is a kind of electromagnetic wave, but it is harmless to the human body, and it is a useful electromagnetic wave that penetrates the inside of the body and warms the body by helping blood circulation smoothly by far-infrared radiation. As a result of testing the effect of warming the body part wearing far-infrared fiber clothing, it is reported that the body temperature increased by 1.25 degrees not only in the worn part, but also in the part that was not touched, such as the wrist. In this way, the far-infrared material (emitter) emits far-infrared rays to activate molecular movement within the cell, thereby activating the metabolism with excellent thermal insulation power.

1 shows the emissivity of the far-infrared unprocessed fiber and the far-infrared processed fiber, and shows the skin temperature when 30 minutes have elapsed after undressing.

Figure 1 (a) shows the lapse of 30 minutes after taking off the far-infrared unprocessed fiber, and Figure 1 (b) shows the lapse of 30 minutes after taking off the far-infrared processed fiber.

When the emissivity of the far-infrared unprocessed fiber and the far-infrared processed fiber is measured, it can be seen that the absorption and re-emitting properties of the far-infrared radiation are clearly improved in the processed fiber. As shown in FIG. 1 , it was verified by measuring the actual skin temperature, which indicates that the use of far-infrared processed fibers has a high skin temperature.

As a far-infrared emitter, it has been reported that a blend with a rare earth metal oxide such as natural ore or ceramic is introduced into a fiber.

Natural ores and ceramics promote physiological metabolism by negative ions and far-infrared rays, and have antiviral, antibacterial, antifungal, deodorizing, and anti-mite functions. Nondan, Journal of Far Infrared Ray Association of Korea, No. 9, 35-36 pp.) In metal oxide ceramics, the ceramics themselves have antibacterial activity. These materials are Al ₂ O ₃ , MgO, CaO, ZnO, and the like. These materials have antibacterial activity even without irradiating light, and have physiological and biological effects at room temperature. These materials are used as functional nanomaterials.

Another material that emits far-infrared rays is carbonized powder made by burning seaweed. The carbonized powder made by burning seaweed used in the embodiment of the present invention uses 0.7 μm and is used as a functional nanomaterial.

It emits far-infrared rays effective to the human body at 35°C, which is close to body temperature, and promotes blood circulation, making the body comfortable and leading to natural healing.

Carbonized powder nano carbon fiber is processed by pulverizing carbonized seaweed powder and synthetically processing it or mixing it with cotton, wool, and other fibers. Because the nano-carbon fiber containing seaweed carbonized powder is directly compounded into the fiber, the effect before and after washing is the same semi-permanent.

Another far-infrared emitting material is tourmaline. Tourmaline contains almost no natural radionuclides such as uranium due to the crystal structure of the mineral. The original tourmaline is a material that has nothing to do with radiation (source: Korea Atomic Energy Research Institute). Tourmaline, also called tourmaline, is a mineral formed when magma crystallizes at high temperature and pressure.

Because this mineral has a variety of colors, it has attracted many people's curiosity and is one of the most versatile gemstones. The reason that tourmaline ceased to be used as a fine gemstone was the fact that, unlike other mines, where the bronchial system of miners working in the tourmaline mines in Brazil were very few, the reaction of tourmaline crystals warmed in the sun to attract or repel light ones. This has been the case since the active research on this.

Accordingly, many scientists began to study tourmaline, and it was revealed by her husband Pierre Curie and her brother Jacques Curie among the Curie couples who were awarded the Nobel Prize in Physics in 1880. They discovered that a small current of 0.06 mA constantly flows through the tourmaline crystal, and this weak current is the most suitable current for the human body.

Tourmaline has permanent electrical properties and is the only permanent electrical property among minerals existing on Earth, so it is also called a polar crystal.

Anions, weak currents (0.06mA), and far-infrared rays generated from tourmaline are substances that are being actively studied in world-class universities and research institutes for health and the environment.

The chemical formula of tourmaline is as follows.

Formula: XY3Z6B3Si6O ₂₇ (OH)₃(OH;F)

X= Na, Ca, Y= Mg, Mn, Fe, Li, Al

Z= Al, Fe, Cr, Mg (Na,Ca)(Mg,Li,Al,Fe ²⁺ ,Fe ³⁺ ) ₃ (Al,Mg,Cr) ₆ B ₃ Si ₆ (OH,O,F) ₄

Tourmaline is mainly composed of magnesium (Mg), iron (Fe), boric acid (B), silicon (Si), and calcium (Ca). Mg (magnesium) is effective for cell activation, heart strengthening, and nervous system, Fe (iron) has good blood and antibacterial properties, B (boric acid) promotes growth and development, and is effective for skin and mucous membranes, and Si ( Silicon) strengthens the skin from the inside and has a good effect on the kidneys, liver, pancreas, and stomach, and Ca (calcium) promotes bone growth. Efficacy by characteristics of tourmaline has characteristics and efficacy such as weak current, far-infrared radiation, anion generation, antibacterial and deodorizing effect.

The carbonized tourmaline powder used in the present invention is 0.7 μm.

The characteristics of nano-carbon fibers are light weight and excellent mechanical properties, excellent conductivity from carbonaceous material, heat resistance, low thermal expansion rate, chemical stability, high thermal conductivity, etc., so they are used for various purposes.

It weighs one-fifth that of iron, but is ten times stronger than steel, so it is widely used in aviation, space, energy, civil engineering, electronics, sports, clothing, and textiles.

With the development of nano-carbon fibers that are lighter than steel and have much higher strength, they are increasingly being replaced by composite materials. When the weight is reduced, the fuel efficiency of automobiles is improved and carbon emissions can be reduced, so it is attracting attention as an eco-friendly material.

It is widely used in our daily life, not only in automobiles, but also in building materials, electronic products, sporting goods, and textiles.

In nanocarbon fibers, carbon atoms are attached in the form of hexagonal ring crystals along the length of the fiber, and this molecular arrangement has strong physical properties. A single thread is made up of thousands of nanocarbon fibers, and when combined with ceramics, plastics, glass, etc., a high-strength composite material is created. Because the density of nano-carbon fibers is lower than that of steel, they are light in weight and strong.

FIG. 2 is a schematic view illustrating a process of making nano-carbon fibers by using an electrospinning method as a synthesis process of nano-carbon fibers.

Step 1 uses PAN as a precursor and dimethylformamide (hereinafter, referred to as "DMF") as a solution.

Dissolve 5 wt% of PAN in the DMF solution and use it as a spinning solution.

The reason for the concentration of 5wt% is that, as shown in the average diameter of the nanocarbon fibers according to the concentration of PAN in FIG. 6, when the concentration is 5wt%, the average diameter (223nm) of the nanocarbon fibers is the smallest. It is preferable that the concentration be 10 wt% or less, and when the concentration is higher than that, the average diameter of the nano-carbon fibers increases rapidly. The concentration in which the average diameter of the nano-carbon fibers is the smallest is 5wt%, followed by 10wt% and 8wt% in the order.

After installing the spinning solution, apply a voltage of 16 kV at a flow rate of 17.0 μl/min with an electronic spinning device, and the distance between the spinning syringe and the collector should be 15 cm. Place an aluminum membrane on a flat collector and fabricate a nano-carbon fiber filter on it.

The nano-carbon fiber protective clothing manufacturing method of the present invention consists of the following steps.

(1) Step 1

As a first step, a polymer nanofiber is prepared by dissolving a carbon precursor and then using an electrospinning method. Using the prepared polymer nanofibers, nanocarbon fibers can be obtained through stabilization and carbonization processes. The carbon precursor added to the electrospinning solution is one of the most important factors in determining the properties of the finally obtained nanocarbon fiber, polyacrylonitrile (PAN), pitch, cellulose, poly(vinyl alcohol) (PVA), polyimide (PI), poly( amic acid) (PAA), polybenzimidazole (PBI), poly(p-xylenetetrahydrothiophenium chloride) (PXTC), etc. may be used.

PAN has excellent electrospinning properties, has a high carbonization yield of 50% or more, and has a high melting point, so it is mainly used for manufacturing high-performance nano-carbon fibers compared to other carbon precursors.

On the other hand, pitch-made nanocarbon fibers show higher crystallinity, excellent tensile modulus, and higher electrical conductivity after carbonization than when using a PAN precursor, but due to difficulties in refining and melting and low electrospinning properties, the pitch is lower than that of the carbon precursor. It is difficult to use alone.

Therefore, it is also possible to improve the performance of nanocarbon fibers by adding pitch to the PAN-based electrospinning solution. In order to manufacture electrospun polymer fibers using PAN precursors into high-functioning nano-carbon fibers, a two-step process is essential.

(2) Second step: Electrospinning under 16kV application.

The reason why the applied voltage is 16 kV is because, as shown in the average diameter of the nano-carbon fibers according to the applied voltage in FIG. 7, when the applied voltage is 16 kV, the average diameter of the nano-carbon fibers is the smallest at 300 nm or less.

Third step: This is a stabilization step (oxidation in air) carried out in the region of 180 ~ 200 ℃ under an air atmosphere.

Step 4: This is a carbonization step carried out in the 400 ~ 1000 ℃ region under a nitrogen atmosphere.

Step 5: After being immersed in the functional nanomaterial, the functional nanocarbon fiber is manufactured by drying. There are various materials as functional nanomaterials, but in the present invention, carbonized seaweed powder, tourmaline carbonized powder, and Al ₂ O ₃ are used.

3 is a chemical formula showing the stabilization process of the PAN precursor nanofiber. In the stabilization step carried out in an oxidizing atmosphere, a cyclization reaction and a dehydrogenation reaction proceed to form a ladder structure having heat resistance, thereby preventing the nanofibers from melting at a high temperature.

After this stabilization step, the white PAN polymer nanofibers turn brown. Since the stabilization step does not proceed in an inert atmosphere, it must be carried out in an oxidizing atmosphere. After raising the temperature at 1°C/min to 180-200°C in an air atmosphere, it is maintained for 1 h to stabilize.

After the stabilization step is completed, the carbonization step carried out in the 400 ~ 1000 ℃ region under an inert atmosphere is performed as a subsequent step.

Figure 4 is a chemical formula showing the carbonization step process of the stabilized nanofiber.

In the carbonization step carried out under an inert atmosphere, an aromatic ring grows and polymerization proceeds at a high temperature, and in this process, the mass content of carbon is converted to 90% or more. If you look closely at the carbonization process, it can be divided into two stages. The first stage is a pyrolysis process in the region of 400-600 °C. In this region, the polymer ring is unstable and the mass transfer rate is slow.

The second stage is the final carbonization temperature range of 600°C or higher, where the polymer ring is structurally stabilized to form the final high-purity carbon. In addition, when heated to a temperature of 800 ° C. or higher, N2, HCN gas increases, and CH4, CO, CO2 gas is generated to increase the number of carbon rings, thereby manufacturing high-strength nano-carbon fibers.

During the carbonization process, an inert atmosphere is mainly maintained using 99.99% nitrogen gas, which improves the elastic modulus and tensile strength. The temperature is raised while supplying nitrogen gas in an amount of 55 mL/min. The use of HCl vapor can improve the yield of carbon acquisition, but has the disadvantage of corrosive equipment.

[Example]

Figure 5 shows a photograph of the cross-sectional surface of the alumina nano-carbon fiber.

Figure 5 (a) shows a black alumina powder, Figure 5 (b) shows an enlarged photograph of the black alumina powder, Figure 5 (c) shows a cross-sectional surface photograph of alumina nano-carbon fibers.

Aluminum oxide (Al ₂ O ₃ ) is used as a functional nanomaterial. In metal oxide ceramics, ceramics themselves have antibacterial activity, and aluminum oxide (Al ₂ O ₃ ) among its materials is a metal oxide generated by a reaction between metal and oxygen. It is also known as a basic oxide because it makes it easy to form hydroxide when it reacts with water. This is because aluminum, which belongs to the IIIA series of the periodic table, tends to emit electrons from the last energy level. This tendency is due to the metallic properties and low electronegativity (1.61 on Pauling scale), which imparts electrical conductivity and converts it into positive ions.

In contrast, oxygen is more electronegative because it is a non-metal and is highly electronegative (3.44 on the Pauling scale). Therefore, it tends to stabilize the last level of electron energy by accepting electrons and thus becomes an anion.

The following [Table 1] shows the component table of Al ₂ O ₃ used in the present invention.

The component table of Al ₂ O ₃ used in the present invention is as follows.

Mean particle size, μm 0.4 Specific surface area, m ² /g 7.54 Composition, % Al ₂ O ₃ 99.8% Na ₂ O 0.03% SiO ₂ 0.04% Fe ₂ O ₃ 0.01% Ignition loss 0.3%

Bonds formed of nano-carbon fibers have a strong bonding force, which is mixed with oxygen-forming compounds such as corundum or emery, and is very resistant and used for abrasive compounds. Aluminum oxide (Aluminum Oxide, Al ₂ O ₃ ) is called alumina and is a white powder with a molecular weight of 101.96 g/mol, a specific gravity of 3.965 g/cm 3 , and a melting point of 2072 ° C. Aluminum oxide has excellent electrical insulation (1×10 ¹⁴ to 1×10 ¹⁵ Ωcm), high mechanical strength (300 to 630 MPa), compressive strength (2,000 to 4,000 MPa), high hardness (15 to 19 GPa), and thermal conductivity It has high (20~30 W/mk), high corrosion resistance and wear resistance.

Alumina nano-carbon fiber is a fiber with excellent abrasion resistance and heat resistance among ceramic fibers. It has a polycrystalline structure with a diameter of about 10 μm and a particle size of 150 to 600 nm. In particular, it is characterized by low porosity (up to 9%) and has a smooth surface. Alumina ceramic nanocarbon fiber has excellent heat resistance (>1000 degrees), chemical resistance and corrosion resistance, light weight compared to metal, and has excellent tensile strength (>2,000 MPa) and modulus (200 GPa).

In particular, the nano-carbon fiber formed of aluminum oxide reflects infrared rays, which is a kind of electromagnetic wave, and thus has an effect of blocking heat.

In the above embodiment, seaweed carbonized powder, tourmaline, natural ore and ceramics, Al ₂ O ₃ , MgO, CaO, ZnO, etc. may be used as functional nanomaterials.

In addition, as a functional nanomaterial in the above embodiment, the carbonized seaweed powder, the carbonized tourmaline powder, and the Al ₂ O ₃ weight ratio of each of 1:1:1 can be manufactured.

The nano-carbon fiber protective clothing manufacturing method and the protective clothing of the present invention are to have an anti-virus by forming the nano-carbon fiber diameter to be small.

In addition, the present invention is to make the nano-carbon fiber itself have antibacterial and far-infrared effects, blocks infrared rays, has abrasion resistance and heat resistance, and provides a method for manufacturing nano-carbon fiber protective clothing for antibacterial, anti-viral, and mite-proof, and a protective suit It has industrial applicability as a technology to

Claims (6)

In the manufacturing method of nano carbon fiber protective clothing,
Preparing a spinning solution using PAN as a precursor and DMF as a solution;
forming a nanofiber filter by electrospinning the spinning solution;
After heating the nanofiber filter to 180 ~ 200 ℃ in an air atmosphere at 1 ℃ / min, stabilizing step by maintaining 1 h;
Carbonization step carried out in the region of 400 ~ 1000 ℃ under an inert atmosphere while supplying the stabilized nanofiber filter at 55 mL / min of nitrogen gas;
Forming a nano-carbon fiber filter consisting of;
By immersing the nano-carbon fiber filter in a functional nano-material, comprising the step of attaching the functional nano-material to the nano-carbon fiber filter,
When electrospinning is performed in the step of forming the nanofiber filter by electrospinning the spinning solution, the voltage applied at the spinning solution flow rate of 17.0 μl / min is 16 kV, and the distance between the spinning syringe and the collector is 15 cm, characterized in that ,
In the step of preparing a spinning solution using PAN as the precursor and DMF as a solution, the concentration of the PAN is 5 wt% so that the average diameter of the nano-carbon fibers is 223 nm,
The functional nanomaterial is carbonized seaweed powder, carbonized tourmaline powder, and Al ₂ O ₃ , and the weight ratio of the carbonized seaweed powder, the carbonized tourmaline powder, and the Al ₂ O ₃ is 1:1:1, respectively, characterized in that , The carbonized seaweed powder and the carbonized tourmaline powder are each 0.7 μm.
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