KR102679948B1 - Nanofiber filter for removing ultrafine dust using bipolaron and method of manufacturing same - Google Patents

Abstract

A nanofiber filter for removing ultrafine dust using bipolarons and a method for manufacturing the same are disclosed. The nanofiber filter is a nanofiber structure containing polyimide nanofibers; and a coating layer formed on the surface of the polyimide nanofiber and containing polyaniline. By including this, partial polarization occurs here and there, thereby increasing ultrafine dust through attraction with fine dust carrying partial charges. It can be captured well.

Description

Nanofiber filter for removing ultrafine dust using bipolaron and manufacturing method thereof {NANOFIBER FILTER FOR REMOVING ULTRAFINE DUST USING BIPOLARON AND METHOD OF MANUFACTURING SAME}

The present invention relates to a nanofiber filter for removing ultrafine dust using bipolarons and a method of manufacturing the same. Specifically, by coating polyaniline on polyimide nanofibers, partial polarization occurs in various places, thereby causing partial charge. This relates to a nanofiber filter that can better capture ultrafine dust through attraction with existing fine dust and its manufacturing method.

Fine dust refers to dust that floats in the air and is so small that it cannot be seen. It is classified according to particle size. Among these fine dust, those with a particle size of 2.5 μm or less are called ultrafine dust. The smaller the fine dust is, the easier it is to penetrate deep into the human body without being filtered out by the respiratory tract, where it sticks to the bronchi and lungs and causes various diseases. In particular, the dust components caused by yellow dust generated from natural activities mainly consist of calcium, iron, aluminum, and magnesium. Unlike soil components, fine dust is mainly generated by combustion, so it is more harmful to the human body because it consists of ionic components such as sulfate, nitrate, and ammonia and harmful substances such as metal compounds and carbon compounds. In addition, restrictions on industrial processes and external activities such as semiconductors and displays have an impact on the overall economy.

Filters currently used to remove fine dust have the disadvantage of consuming a lot of energy for filtering due to the high differential pressure in the form of irregular tangles of micrometer-sized fibers. Except for physically filtering out large particles, most of them are strong. Because it has to absorb ultrafine dust with static electricity, it has the problem of being vulnerable to moisture. Therefore, nanofiber membranes, which have a very small fiber diameter and can physically collect fine dust, are being actively studied as a next-generation filter for fine dust removal.

However, in the case of ultrafine dust, it easily passes through the space between the fibers of the nanofiber membrane. Increasing the density of nanofibers increases the collection efficiency of ultrafine dust, but there is a problem in that the air permeability is significantly lowered.

Therefore, research is needed on filters with high air permeability and high efficiency in capturing ultrafine dust and their manufacturing methods.

The purpose of the present invention is to solve the above problems and to provide a highly efficient nanofiber filter for removing ultrafine dust with a fiber density that ensures breathability and a method for manufacturing the same.

According to one aspect of the present invention, a nanofiber structure containing polyimide nanofibers; and a coating layer formed on the surface of the polyimide nanofiber and containing polyaniline. A nanofiber filter including a is provided.

Additionally, the nanofiber structure may be a three-dimensional porous membrane structure in which the polyimide nanofibers are intertwined or aligned in a certain direction.

Additionally, the polyaniline may be doped with a dopant.

In addition, the dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), boric acid (H ₃ BO ₃ ), hydrofluoric acid (HF), and hydrobromic acid. (HBr), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH (OH)COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxyl. It may include one or more types selected from the group consisting of acids (COOHCH ₂ C(OH)(COOH)CH ₂ COOH).

Additionally, the polyaniline can form a bipolaron by the dopant.

Additionally, the polyaniline can have a strong dust collection effect due to the bipolarone.

Additionally, the nanofibers may have a diameter of 200 to 500 nm.

Additionally, the nanofiber filter may have a permeability of 10 to 100 cm ³ /g _f ·s.

Additionally, the nanofiber filter may be used to remove any one selected from the group consisting of ultrafine dust and fine dust.

According to another aspect of the present invention, (a) electrospinning a poly(amic acid) polymer solution to produce polyamic acid nanofibers; (b) heat-treating the polyamic acid nanofibers to produce a nanofiber structure containing polyimide nanofibers; and (c) coating polyaniline on the surface of the nanofiber structure to produce a nanofiber filter with a coating layer containing polyaniline on the surface of the nanofiber structure.

In addition, step (c) includes (c-1) preparing a coating solution containing an aniline monomer and an oxidizing agent; And (c-2) coating the coating solution on the surface of the nanofiber structure to produce a nanofiber filter with a coating layer containing polyaniline formed on the surface of the nanofiber structure.

Additionally, the oxidizing agent may include one or more selected from the group consisting of ammonium persulfate (APS), sodium persulfate, and perchlorate.

Additionally, the mass ratio (W _oxidant /W _aniline ) of the aniline monomer and the oxidizing agent in the coating solution may be 1 to 10.

In addition, the coating solution further includes a dopant, and the dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), and boric acid (H ₃ BO). ₃ ), hydrofluoric acid (HF), hydrobromic acid (HBr), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH(OH)COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxylic acid (COOHCH ₂ C(OH)(COOH)CH ₂ COOH).

Additionally, the molar concentration of the dopant in the coating solution may be 0.1 to 5 M.

In addition, the method for manufacturing the nanofiber filter is, before step (a), (a') reacting a polymer precursor solution containing a dianhydride monomer, a diamine monomer, and an organic solvent to produce a polyamic acid polymer. It may further include preparing a solution.

In addition, the polymer precursor solution contains a total of 5 to 25 parts by weight of the dianhydride monomer and the diamine monomer based on 100 parts by weight of the organic solvent, and the dianhydride monomer and the diamine monomer in the polymer precursor solution. The molar ratio may be the same.

In addition, the dianhydride monomers include PMDA (pyromellitic dianhydride), BPDA (3,3'4,4'-biphenyltertracarboxylic dianhydride), BTDA (3,3'4,4'-benxophenetetracarboxylic dianhydride), and 6FDA (perfluoroisopropylidene containing acid dianhydride). ), ODPA (oxydiphthalic dianhydride), and DSDA (diphenylsulfon-3,4,3',4'-tetracarbonic dianhydride), wherein the diamine monomer is PDA (phenylene diamine), ODA ( oxydianiline), HXDA (hexamethylene diamine), and TMD (Trimethyl hexamethylene diamine), and the organic solvent is DMF (dimethylformamide), MeCN (acetonitrile), DMSO (dimethyl sulfoxide), Acetone, Dichloromethane , THF (tetrahydrofran), and ethyl acetate.

Additionally, electrospinning in step (a) may be performed at a voltage of 15 to 20 V.

Additionally, step (b) may be performed at a temperature of 100 to 500 °C.

The nanofiber filter of the present invention and its manufacturing method coat polyimide nanofibers with polyaniline, thereby generating partial polarization in various places, thereby better capturing ultrafine dust through attraction with partially charged fine dust. .

Since these drawings are for reference in explaining exemplary embodiments of the present invention, the technical idea of the present invention should not be interpreted as limited to the attached drawings.
Figure 1 is a schematic diagram of a nanofiber filter manufactured according to one embodiment of the present invention.
Figure 2 is a schematic diagram of a method for manufacturing a nanofiber filter according to an embodiment of the present invention.
Figure 3 shows SEM photographs of Comparative Example 1 (nanofibers) and Example 1 (polyaniline-coated nanofibers).
Figure 4 shows the results of a fine dust collection test using nanofiber filters manufactured according to examples and comparative examples of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention.

However, the following description is not intended to limit the present invention to specific embodiments, and in describing the present invention, if it is determined that a detailed description of related known technology may obscure the gist of the present invention, the detailed description will be omitted. .

The terminology used herein is only used to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, or a combination thereof described in the specification, but are not intended to indicate the presence of one or more other features or It should be understood that this does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, or combinations thereof.

Additionally, terms including ordinal numbers, such as first, second, etc., which will be used below, may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component.

Additionally, when a component is referred to as being "formed" or "laminated" on another component, it may be formed or laminated directly on the entire surface or one side of the surface of the other component, but may also mean that the component is "formed" or "laminated" on another component. It should be understood that other components may exist.

Hereinafter, a nanofiber filter for removing ultrafine dust using bipolarons and its manufacturing method will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

Figure 1 is a schematic diagram of a nanofiber filter manufactured according to one embodiment of the present invention.

Referring to Figure 1, the present invention includes a nanofiber structure 100 containing polyimide nanofibers; and a coating layer 200 formed on the surface of the polyimide nanofibers and containing polyaniline (polyaniline).

Additionally, the nanofiber structure may be a three-dimensional porous membrane structure in which the polyimide nanofibers are intertwined or aligned in a certain direction.

Additionally, the polyaniline may be doped with a dopant.

In addition, the dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), boric acid (H ₃ BO ₃ ), hydrofluoric acid (HF), and hydrobromic acid. (HBr), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH (OH)COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxyl. It may contain one or more types selected from the group consisting of acids (COOHCH ₂ C(OH)(COOH)CH ₂ COOH), and preferably contains hydrochloric acid (HCl).

Additionally, the polyaniline can form a bipolaron by the dopant.

Additionally, the polyaniline may have a strong dust collection effect due to the bipolarone.

Additionally, the nanofibers may have a diameter of 200 to 500 nm.

Additionally, the nanofiber filter may have a permeability of 10 to 100 cm ³ /g _f ·s.

Additionally, the nanofiber filter may be used to remove any one selected from the group consisting of ultrafine dust and fine dust, and may preferably be used to remove ultrafine dust.

Figure 2 is a schematic diagram of a method for manufacturing a nanofiber filter according to an embodiment of the present invention.

Referring to Figure 2, the present invention includes the steps of (a) producing polyamic acid nanofibers by electrospinning a poly(amic acid) polymer solution; (b) heat-treating the polyamic acid nanofibers to produce a nanofiber structure containing polyimide nanofibers; and (c) coating polyaniline on the surface of the nanofiber structure to produce a nanofiber filter with a coating layer containing polyaniline on the surface of the nanofiber structure.

In addition, step (c) includes (c-1) preparing a coating solution containing an aniline monomer and an oxidizing agent; And (c-2) coating the coating solution on the surface of the nanofiber structure to produce a nanofiber filter with a coating layer containing polyaniline formed on the surface of the nanofiber structure.

In addition, the oxidizing agent may include one or more selected from the group consisting of ammonium persulfate (APS), sodium persulfate, and perchlorate, and preferably includes ammonium persulfate. You can.

Additionally, the mass ratio (W _oxidant /W _aniline ) of the aniline monomer and the oxidizing agent in the coating solution may be 1 to 10. If the mass ratio is less than 1, polyaniline may be insufficiently coated on the surface of the nanofiber due to an incomplete polymerization reaction, and if it exceeds 10, because there is an excessive amount of oxidizing agent, it is polymerized into single molecule polyaniline and causes fine dust and This is not desirable as manpower is lowered.

In addition, the coating solution further includes a dopant, and the dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), and boric acid (H ₃ BO). ₃ ), hydrofluoric acid (HF), hydrobromic acid (HBr), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH(OH)COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxylic acid (COOHCH ₂ C(OH)(COOH)CH ₂ COOH), and preferably includes hydrochloric acid (HCl). can do.

Additionally, the molar concentration of the dopant in the coating solution may be 0.1 to 5 M, preferably 0.5 to 2 M. If the dopant is less than 0.5 M, polyaniline may be insufficiently coated on the nanofiber surface due to an incomplete polymerization reaction, and if it exceeds 2 M, polyaniline is polymerized into a single molecule form and the attractive force with fine dust is lowered, which is desirable. don't do it

In addition, the method for manufacturing the nanofiber filter is, before step (a), (a') reacting a polymer precursor solution containing a dianhydride monomer, a diamine monomer, and an organic solvent to produce a polyamic acid polymer. It may further include preparing a solution.

Additionally, the polymer precursor solution may include a total of 5 to 25 parts by weight of the dianhydride monomer and the diamine monomer based on 100 parts by weight of the organic solvent. If the total amount of the dianhydride monomer and the diamine monomer is less than 5 parts by weight, it is undesirable because beads in the form of beads rather than nanofibers are formed, thereby reducing filter efficiency, and if it exceeds 25 parts by weight, This is undesirable because the viscosity of the polymer solution increases too much, making electrospinning impossible.

In addition, the dianhydride monomers include PMDA (pyromellitic dianhydride), BPDA (3,3'4,4'-biphenyltertracarboxylic dianhydride), BTDA (3,3'4,4'-benxophenetetracarboxylic dianhydride), and 6FDA (perfluoroisopropylidene containing acid dianhydride). ), ODPA (oxydiphthalic dianhydride), and DSDA (diphenylsulfon-3,4,3',4'-tetracarbonic dianhydride), and preferably includes PMDA (pyromellitic dianhydride). You can.

In addition, the diamine monomer may include one or more selected from the group consisting of phenylene diamine (PDA), oxydianiline (ODA), hexamethylene diamine (HXDA), and trimethyl hexamethylene diamine (TMD), and preferably oxydianiline (ODA). ) may include.

In addition, the organic solvent may include one or more selected from the group consisting of DMF (dimethylformamide), MeCN (acetonitrile), DMSO (dimethyl sulfoxide), Acetone, Dichloromethane, THF (tetrahydrofran), and Ethyl acetate, preferably May contain dimethylformamide (DMF).

Additionally, electrospinning in step (a) may be performed at a voltage of 15 to 20 V. If the electrospinning is performed at a voltage of less than 15 V, the nanofibers are more in the form of beads instead of lines, which is not preferable because the filter efficiency is reduced, and if it exceeds 20 V, the nanofibers are not uniformly radiated to the target. It is not desirable.

Additionally, step (b) may be performed at a temperature of 100 to 500 °C. If step (b) is performed at a temperature of less than 100°C, it is undesirable because polyimide nanofibers are not formed from polyamic acid nanofibers, and if it exceeds 500°C, it is undesirable because the nanofibers are damaged by heat. .

[Example]

Hereinafter, the present invention will be described with reference to preferred embodiments. However, this is for illustrative purposes only and does not limit the scope of the present invention.

Manufacturing of polyimide/polyaniline nanofiber filters

Example 1

A polymer precursor solution was prepared by mixing pyromellitic dianhydride (PMDA) as a dianhydride monomer and oxydianiline (ODA) as a diamine monomer in the organic solvent DMF in equal molar quantities. At this time, the total weight of the two monomers (dianhydride monomer and diamine monomer) in the polymer precursor solution is 18.4 wt%.

The polymer precursor solution was stirred to prepare a polyamic acid polymer solution.

Polyamic acid nanofibers were prepared by electrospinning the polymer solution. At this time, the electrospinning was carried out at room temperature and at a voltage of 15 to 20 kV for 10 minutes.

The polyamic acid nanofibers prepared above were heated at 100°C (4°C/min) for 1 hour, at 200°C (4°C/min) for 1 hour, at 300°C (4°C/min) for 1 hour, and at 400°C (4°C/min). min) to sequentially heat treat for 1 hour to prepare a nanofiber structure containing polyimide nanofibers.

A coating solution was prepared by mixing 5 g/L of aniline monomer, 25 g/L of ammonium persulfate, and 36 g/L of hydrochloric acid as a dopant. The polyimide nanofibers were immersed in the coating solution to form a nanofiber filter in which a coating layer containing polyaniline was formed on the surface of the nanofiber structure.

Afterwards, the nanofiber filter was washed with distilled water and dried at 80°C for 24 hours to prepare a PI@Polyaniline nanofiber filter.

Polyimide nanofiber filter

Comparative Example 1

A polymer precursor solution was prepared by mixing pyromellitic dianhydride (PMDA) as a dianhydride monomer and oxydianiline (ODA) as a diamine monomer in the organic solvent DMF in equal molar quantities. At this time, the total weight of the two monomers (dianhydride monomer and diamine monomer) in the polymer precursor solution is 18.4 wt%.

The polymer precursor solution was stirred to prepare a polyamic acid polymer solution.

Polyamic acid nanofibers were prepared by electrospinning the polymer solution. At this time, the electrospinning was carried out at room temperature and at a voltage of 15 to 20 kV for 10 minutes.

The polyamic acid nanofibers prepared above were heated at 100°C (4°C/min) for 1 hour, at 200°C (4°C/min) for 1 hour, at 300°C (4°C/min) for 1 hour, and at 400°C (4°C/min). min) to prepare a polyimide nanofiber filter by sequential heat treatment for 1 hour.

[Test example]

Test Example 1: Confirmation of polyaniline coating

Figure 3 shows SEM photographs of Comparative Example 1 (nanofibers) and Example 1 (polyaniline-coated nanofibers).

Referring to Figure 3, it can be seen that polyaniline is well coated in Example 1 compared to the uncoated nanofiber (Comparative Example 1).

Test Example 2: Fine dust collection test

Figure 4 shows the results of a fine dust collection test using nanofiber filters manufactured according to Example 1 (PI@Polyaniline) and Comparative Example 1 (PI). In detail, the collection efficiency of fine dust with sizes of 0.3 μm, 0.5 μm, 1 μm, 2.5 μm, and 5 μm is shown using the nanofiber filter manufactured according to Example 1 and Comparative Example 1.

Referring to Figure 4, it can be seen that Example 1, in which a coating layer containing polyaniline was formed on the nanofibers, had superior fine dust removal efficiency compared to Comparative Example 1, in which only nanofibers were present.

Test Example 3: Check ventilation

Table 1 below summarizes the air permeability measurement results of nanofiber filters manufactured according to Example 1 (PI@Polyaniline) and Comparative Example 1 (PI).

division Air permeability (cm ³ /g _f ㆍs) Example 1 (PI@Polyaniline) 14 Comparative Example 1 (PI) 15

Referring to Table 1 above, it can be seen that the air permeability of Example 1, in which a coating layer containing polyaniline was formed on the nanofibers, was not significantly reduced compared to the air permeability of Comparative Example 1, in which only nanofibers were present. This showed excellent air permeability. You can confirm that it is maintained.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

10: Nanofiber filter
100: Nanofiber structure
200: coating layer

Claims (20)

Nanofiber structure containing polyimide nanofibers; and
A nanofiber filter comprising a coating layer formed on the surface of the polyimide nanofiber and containing polyaniline,
The polyaniline forms a bipolaron with a dopant,
The polyaniline has a dust collecting effect by the bipolarone,
A nanofiber filter wherein the nanofiber filter is used to remove any one selected from the group consisting of ultrafine dust and fine dust. According to paragraph 1,
The nanofiber structure is a nanofiber filter characterized in that the polyimide nanofibers are entangled with each other or arranged in a certain direction to form a three-dimensional porous membrane structure. delete According to paragraph 1,
The dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), boric acid (H ₃ BO ₃ ), hydrofluoric acid (HF), and hydrobromic acid (HBr). ), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH(OH) )COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxylic acid ( A nanofiber filter comprising at least one selected from the group consisting of COOHCH ₂ C(OH)(COOH)CH ₂ COOH). delete delete According to paragraph 1,
A nanofiber filter, characterized in that the diameter of the nanofiber is 200 to 500 nm. According to paragraph 1,
A nanofiber filter, characterized in that the nanofiber filter has an air permeability of 10 to 100 cm ³ /g _f ·s. delete (a) producing polyamic acid nanofibers by electrospinning a poly(amic acid) polymer solution;
(b) heat-treating the polyamic acid nanofibers to produce a nanofiber structure containing polyimide nanofibers; and
(c) coating polyaniline on the surface of the nanofiber structure to produce a nanofiber filter in which a coating layer containing polyaniline is formed on the surface of the nanofiber structure,
Step (c) above is
(c-1) preparing a coating solution containing an aniline monomer and an oxidizing agent; and
(c-2) coating the coating solution on the surface of the nanofiber structure to produce a nanofiber filter in which a coating layer containing polyaniline is formed on the surface of the nanofiber structure,
The polyaniline forms a bipolaron with a dopant,
The polyaniline has a dust collecting effect due to the bipolarone,
A method of manufacturing a nanofiber filter, wherein the nanofiber filter is used to remove any one selected from the group consisting of ultrafine dust and fine dust. delete According to clause 10,
A method of manufacturing a nanofiber filter, wherein the oxidizing agent includes at least one selected from the group consisting of ammonium persulfate (APS), sodium persulfate, and perchlorate. According to clause 10,
A method for producing a nanofiber filter, characterized in that the mass ratio (W _oxidant /W _aniline ) of the aniline monomer and the oxidizing agent in the coating solution is 1 to 10. According to clause 10,
The coating solution further includes a dopant,
The dopant is hydrochloric acid (HCl), nitric acid (HNO ₃ ), phosphoric acid (H ₃ PO ₄ ), sulfuric acid (H ₂ SO ₄ ), boric acid (H ₃ BO ₃ ), hydrofluoric acid (HF), and hydrobromic acid (HBr). ), carbonic acid (H ₂ CO ₃ ), formic acid (HCOOH), acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), butanoic acid (CH ₃ CH ₂ CH ₂ COOH), lactic acid (CH ₃ CH(OH) )COOH), fumaric acid (COOHCH=CHCOOH), malic acid (COOHCH ₂ CH(OH)COOH), tartaric acid (COOHCH(OH)CH(OH)COOH) and propane-1,2,3-tricarboxylic acid ( COOHCH ₂ C(OH)(COOH)CH ₂ COOH) A method for producing a nanofiber filter, characterized in that it comprises at least one selected from the group consisting of According to clause 14,
A method for producing a nanofiber filter, characterized in that the molar concentration of the dopant in the coating solution is 0.1 to 5 M. According to clause 10,
Before the manufacturing method of the nanofiber filter above step (a),
(a') reacting a polymer precursor solution containing a dianhydride monomer, a diamine monomer, and an organic solvent to prepare a polyamic acid polymer solution; a nanofiber characterized in that it further comprises Filter manufacturing method. According to clause 16,
The polymer precursor solution contains a total of 5 to 25 parts by weight of the dianhydride monomer and the diamine monomer based on 100 parts by weight of the organic solvent,
A method for producing a nanofiber filter, characterized in that the molar ratio of the dianhydride monomer and the diamine monomer in the polymer precursor solution is the same. According to clause 16,
The dianhydride monomers include PMDA (pyromellitic dianhydride), BPDA (3,3'4,4'-biphenyltertracarboxylic dianhydride), BTDA (3,3'4,4'-benxophenetetracarboxylic dianhydride), 6FDA (perfluoroisopropylidene containing acid dianhydride), Contains at least one selected from the group consisting of ODPA (oxydiphthalic dianhydride) and DSDA (diphenylsulfon-3,4,3',4'-tetracarbonic dianhydride),
The diamine monomer includes one or more selected from the group consisting of phenylene diamine (PDA), oxydianiline (ODA), hexamethylene diamine (HXDA), and trimethyl hexamethylene diamine (TMD),
The organic solvent is a nanofiber filter characterized in that it contains one or more selected from the group consisting of DMF (dimethylformamide), MeCN (acetonitrile), DMSO (dimethyl sulfoxide), Acetone, Dichloromethane, THF (tetrahydrofran), and Ethyl acetate. Manufacturing method. According to clause 10,
A method of manufacturing a nanofiber filter, characterized in that the electrospinning in step (a) is performed at a voltage of 15 to 20 kV. According to clause 10,
A method for producing a nanofiber filter, characterized in that step (b) is performed at a temperature of 100 to 500 ° C.