KR102457291B1 - Fine dust filter and its manufacturing method - Google Patents

Abstract

The present invention includes nanofibers formed of a polymer in which benzophenone is added to polybenzimidazole, and has excellent chemical resistance and heat resistance by polybenzimidazole, and blocks ultraviolet rays of sunlight with benzophenone, which is a UV blocker. To provide a fine dust filter that protects nanofibers and minimizes deterioration in performance as a filter such as filtration efficiency, pressure drop and stress strain by including benzophenone in nanofibers in an optimal content, enabling natural ventilation and a method for manufacturing the same.

Description

Fine dust filter and its manufacturing method

The present invention provides a fine dust filter capable of protecting nanofibers from ultraviolet rays of sunlight by adding benzophenone to polybenzimidazole and electrospinning on a polyester mesh to form a nanofiber, and manufacturing the same it's about how

Particulate Matter (PM) emitted from factories, automobiles, power plants and by-products of secondary chemical reactions due to industrial advancement poses a threat to human health. and fatal diseases such as cardiovascular disease. In addition, since the size of ultrafine dust is similar to that of human tissue, it can easily penetrate into the human respiratory system.

In order to cope with such ultrafine dust in outdoor air and to protect indoor air quality, an air purifier is provided indoors or an air circulation system equipped with a high-performance air filter is used to purify indoor air. Such an air purifier and air circulation system can filter ultra-fine dust as small as 0.3 μm, but it is burdensome to use due to high installation and maintenance costs.

In this regard, an air filter that can be easily installed on a window is being developed to filter out ultrafine dust under natural ventilation conditions. In the case of an air filter installed on a window, it should have high filtration efficiency without compromising the original function of the window, such as high air permeability and visibility. In addition, it should not be easily damaged by harsh external environmental conditions such as ultraviolet (UV) exposure due to sunlight and acid rain.

In the case of a filter made of general synthetic fiber, it is not easily damaged by poor external environmental conditions, but it is difficult to satisfy high air permeability, visibility and filtration efficiency as an air filter for filtering ultrafine dust.

Therefore, a polymer-based nanofiber filter is being studied to realize its performance as an air filter for filtering ultrafine dust. However, when the polymer-based nanofiber filter is exposed to ultraviolet rays of sunlight for a long time, the polymer nanofiber is damaged and the filtering performance is rapidly deteriorated.

The prior art (Patent Publication No. 10-2017-0120372) relates to a window filter for blocking fine dust and a manufacturing method thereof, and discloses a filter for filtering fine dust by attaching a polymer nanofiber web to an insect screen, and have. However, the prior art has problems in that the nanofiber web is vulnerable to UV rays and is easily damaged, and has poor chemical resistance and heat resistance.

Republic of Korea Patent Publication No. 10-2017-0120372, 2017.10.31., window filter for blocking fine dust and manufacturing method thereof

The problem to be solved in the present invention is to solve the problems of the prior art, and it is excellent in chemical resistance and heat resistance by polybenzimidazole, including nanofibers formed of a polymer obtained by adding benzophenone to polybenzimidazole. and to provide a fine dust filter that contains benzophenone, which is a UV blocker, in an optimal content to protect nanofibers from UV rays and maintain high filtration efficiency, and a method for manufacturing the same.

In order to solve the above problems, the fine dust filter according to the present invention includes a polyester mesh and nanofibers laminated on the polyester mesh, wherein the nanofibers include polybenzimidazole and benzophenone. It is characterized in that the polymer solution is formed by electrospinning.

In addition, the polymer solution is characterized in that it contains a polybenzimidazole solution of 16% by weight.

Here, the polybenzimidazole solution, including dimethylacetamide, is characterized in that 16% by weight of the polybenzimidazole is dissolved based on the total weight.

In another embodiment of the present invention, in the method for manufacturing a fine dust filter comprising a polyester mesh and nanofibers, wherein the nanofibers include polybenzimidazole and benzophenone, the polybenzimidazole and benzophenone are mixed A solution preparation step of preparing a polymer solution, a solution input step of putting the polymer solution into a syringe, a mesh preparation step of preparing a polyester mesh in a metal collector electrically grounded with the syringe, and the syringe and the metal collector It characterized in that it comprises; nanofiber forming step of spinning the polymer solution on the polyester mesh by applying a voltage to the filter separation step of separating the polyester mesh in which the nanofiber is formed from a metal collector.

In addition, the solution preparation step is characterized in that it comprises a polybenzimidazole solution preparation step containing 16% by weight of the polybenzimidazole.

Here, the nanofibers have an average diameter of 250 nm.

The fine dust filter according to the present invention contains polybenzimidazole, a polymer with excellent heat and chemical resistance, and benzophenone, a UV blocker, to protect nanofibers from harsh external environments such as ultraviolet rays from sunlight, high temperature, and acid rain for a long time. There is an advantage in that it is possible to provide a fine dust filter with excellent filtration efficiency.

The fine dust filter according to the present invention has advantages in that the nanofibers contain benzophenone in an optimal content to protect them from UV rays, and at the same time minimize the performance degradation of filtration efficiency, pressure drop, and stress strain.

According to the method of manufacturing a fine dust filter according to the present invention, nanofibers are produced by electrospinning a polymer solution, and the diameter of the nanofibers can be easily adjusted according to the injection speed, distance, and voltage of the electrospinning. There is an advantage in that it is possible to manufacture nanofibers of excellent diameter.

1 is a view schematically showing a fine dust filter according to the present invention.
2 is a view schematically showing the UV absorption mechanism of benzophenone, which is a sunscreen.
3 is a photograph of an apparatus for confirming the filtration performance of the fine dust filter according to the present invention.
4 to 5 are measurements of filtration efficiency, pressure drop, and stress strain of the fine dust filter according to the content of benzophenone.
6 is a measurement of the filtration efficiency of the fine dust filter and other filters according to the present invention before and after exposure to UV of 365 nm wavelength for 765 hours.
7 to 8 are measurements of filtration efficiency, pressure drop, and strain according to exposure time at 253 nm wavelength of the fine dust filter and the PBI filter according to the present invention.
9 is a photograph of the filter according to the short-wavelength UV exposure time when the benzophenone content is 0% by weight.
The filtration efficiency, pressure drop, stress strain, and FT-IR of the fine dust filter according to the present invention of FIG. 10 were measured before and after immersion in strong acid.
11 is a graph showing the measurement of filtration efficiency of the fine dust filter and other filters according to the present invention before and after immersion in strong acid.
12 is a graph showing the measurement of filtration efficiency, pressure drop, and stress strain according to the temperature of the fine dust filter according to the present invention.
13 to 16 show examples of heat resistance of the fine dust filter according to the present invention.
17 is a flowchart schematically illustrating a method of manufacturing a fine dust filter according to another embodiment of the present invention.
18 is a photograph of fine dust filters having different light transmittances.
19 is a measurement of the filtration efficiency of nanofibers manufactured according to the method of manufacturing a fine dust filter according to another embodiment of the present invention.

Hereinafter, an embodiment of a fine dust filter and a method for manufacturing the same according to the present invention will be described with reference to the accompanying drawings. At this time, the present invention is not limited or limited by the examples. In addition, in describing the present invention, detailed descriptions of well-known functions or configurations may be omitted to clarify the gist of the present invention.

1 is a diagram schematically showing a fine dust filter according to the present invention, FIG. 2 is a diagram schematically showing the UV absorption mechanism of benzophenone, which is a UV blocker, and FIG. 3 is a diagram showing the filtration performance of the fine dust filter according to the present invention. It is a photograph of the device for confirming, and FIGS. 4 to 5 are measurements of filtration efficiency, pressure drop, and stress strain of the fine dust filter according to the content of benzophenone, and FIG. 6 is a filter other than the fine dust filter according to the present invention. The filtration efficiency was measured before and after 765 hours of exposure to UV of 365 nm wavelength, and FIGS. 7 to 8 are filtration efficiency, pressure drop and stress according to exposure time at 253 nm wavelength of the fine dust filter and PBI filter according to the present invention. The strain was measured, and FIG. 9 is a photograph of the PBI filter according to the UV exposure time, and the filtration efficiency, pressure drop, stress strain, and FT-IR of the fine dust filter according to the present invention of FIG. 10 were measured before and after immersion in strong acid. 11 shows the filtration efficiency of the fine dust filter according to the present invention and other filters before and after immersion in strong acid, and FIG. 12 shows the filtration efficiency, pressure drop, and stress according to the temperature of the fine dust filter according to the present invention. The deformation is measured, and FIGS. 13 to 16 show an example of heat resistance of the fine dust filter according to the present invention, and FIG. 17 is a flowchart schematically illustrating a method of manufacturing a fine dust filter according to another embodiment of the present invention, 18 is a photograph of fine dust filters having different light transmittances, and FIG. 19 is a measurement of filtration efficiency of nanofibers manufactured according to the method of manufacturing a fine dust filter according to another embodiment of the present invention.

Referring to FIG. 1 , the fine dust filter 10 according to the present invention may include a polyester mesh 100 and nanofibers 200 .

The polyester mesh 100 is a mesh made of polyester fibers, and the nanofiber 200 may be laminated and supported because it has excellent dust collection properties, durability and recovery.

The nanofiber 200 is laminated on the polyester mesh 100 in a network structure, and may be formed by electrospinning a polymer solution in which benzophenone is added to polybenzimidazole, and the polyester mesh 100 . It can be densely stacked on the surface and manufactured as the fine dust filter 10 , so that fine dust in the air can be removed.

Here, the polybenzimidazole (PBI) is a heat-resistant polymer, does not dissolve well in organic solvents, has high thermal stability, and has excellent mechanical and chemical durability in environmental conditions such as high temperature caused by sunlight or acid rain. It can keep its shape stably for a long time.

In addition, the benzophenone (Bensophenone, BP) is a UV-blocking agent, which can absorb and block UV by hydroxyl (Hydroxyl, -OH), which is a functional group that absorbs UV, which is UV.

2, the UV absorption mechanism of the benzophenone is shown. The benzophenone contains a UV absorption functional group (-OH) and a substituent attached to the basic structure, and upon UV exposure, a hydroxyl (-OH) group can be excited to the first singlet state (S1) and generate a resonance (S1*) by combining with a nearby -CO bond, thereby releasing the absorbed UV energy as heat (S0*). It is possible to prevent damage to the nanofiber 200 by absorbing UV applied from the outside in the nanofiber 200 to protect the nanofiber 200 from UV.

3 to 5 , the polymer solution forming the nanofiber 200 may include 10% by weight of the benzophenone based on the total weight.

First, the polymer solution is prepared by dissolving the polybenzimidazole in dimethylacetamide to prepare a 16 wt% polybenzimidazole solution, and mixing the polybenzimidazole solution and the benzophenone in a weight ratio of 9: 1 to prepare the polymer solution, hereinafter, PBI-BP 10% by weight means the nanofiber formed from the polymer solution in which the polybenzimidazole solution and the benzophenone are mixed in a weight ratio of 9: 1, 20 wt% of PBI-BP means nanofibers formed of a polymer solution in which the polybenzimidazole solution and the benzophenone are mixed in a weight ratio of 8: 2, and 30 wt% of PBI-BP is the polybenzimidazole solution and It refers to nanofibers formed of a polymer solution in which the benzophenone is mixed in a weight ratio of 7:3.

Referring to FIG. 3 , as a device for checking the filtration performance of the fine dust filter 10 according to the present invention, an atomizer, PM counters #1 and #2, and a wind gauge are used. , a manometer, and a blower, the fine dust filter is positioned between PM counter #1 and PM counter #2, and KCL PM and standard test particles are supplied to the device to evaluate filtration performance. The filtration performance was evaluated with an air flow rate of 0.35 m/s, which corresponds to the air flow rate under natural ventilation conditions.

Referring to FIG. 4 , the filtration efficiency according to the benzophenone content was confirmed. The fine dust filter having an initial pressure drop of 65 Pa by adding 0, 10, 20, or 30 wt % of the benzophenone to the polymer solution. As a result of manufacturing (10) and checking the filtration efficiency of the fine dust filter 10 through the device, the filtration efficiency was similar when the benzophenone content was 0 wt% and 10 wt%, whereas 20 wt% It can be seen that the filtration efficiency is rapidly reduced from Accordingly, in order to prevent a decrease in the filtration efficiency of the fine dust filter 10, it is most preferable to contain 10% by weight of the benzophenone.

Then, referring to FIG. 5 , as a result of examining the stress strain of the fine dust filter 10 according to the benzophenone content, when the benzophenone content is 0 wt% and 10 wt%, the stress strain is similar, whereas , it can be seen that the stress strain is reduced from 20 wt%, and accordingly, it is most preferable to contain 10 wt% of the benzophenone in order to prevent the reduction in the strain strain of the fine dust filter 10 .

Accordingly, when the nanofiber 200 of the fine dust filter 10 contains 10 wt% of the benzophenone, it is possible to minimize the decrease in filtration efficiency and stress strain.

6 to 9 , the fine dust filter 10 may secure the stability of the nanofiber 200 from UV rays.

First, in the case of UV, it can be largely divided into three types depending on the wavelength, 320 to 400 nm long wavelength UVA UVA, 280 to 320 nm medium wavelength UVB UVB, 200 to 280 nm short wavelength UVC UVC, UVA is not absorbed by the ozone layer, so it easily passes through clouds and glass to reach the earth's surface, UVB is mostly absorbed by the ozone layer and only some reaches the earth's surface. As a result, the UV performance of the fine dust filter 10 was measured at a wavelength of 365 nm corresponding to UVA and a wavelength of 253 nm corresponding to UVC.

The fine dust filter 10 containing 10% by weight of the benzophenone was prepared (hereinafter, PBI-BP filter), and as a control thereof, a polybenzimidazole filter (hereinafter, PBI filter), a nylon-6 filter (hereinafter, PA-6 filter), a polyvinylpyrrolidone filter (hereinafter, a PVP filter), and a polyvinyl alcohol filter (hereinafter, a PVA filter) were prepared, respectively, and UV performance was measured.

Referring to FIG. 6 , the filtration efficiency was measured before and after 765 hours of exposure to UV of a general 365 nm wavelength, and all five filters showed excellent filtration efficiency before exposure, but after 765 hours, the PBI filter and the fine dust filter (PBI- The filtration efficiency was lowered in the remaining three filters except for BP 10 wt %), and accordingly, it can be seen that both PBI and fine dust filters (PBI-BP 10 wt %) have excellent UV resistance at 365 nm, which is a general UV wavelength.

Then, in the PBI filter and the fine dust filter (PBI-BP 10% by weight), in which UV resistance was confirmed from long-wavelength ultraviolet rays corresponding to UVA, UV resistance from short-wavelength ultraviolet rays corresponding to UVC, which is a stronger wavelength, was confirmed.

Referring to FIG. 7 , the filtration efficiency and pressure drop according to exposure time at 253 nm wavelength, which is stronger than 365 nm, are measured. The filter (PBI-BP 10% by weight) exhibits a relatively good filtration efficiency of 80% even for 8 hours, and a pressure drop of 40Pa or more can be confirmed.

In addition, referring to FIG. 8 , the stress strain according to exposure time at 235 nm wavelength was measured, and the strength of the PBI filter rapidly decreased from 6 hours, while the fine dust filter (PBI-BP 10 wt%) It can be seen that shows a relatively excellent strength of 50 kPa up to 8 hours.

This is that the PBI filter is damaged as a result of prolonged exposure to strong short-wavelength UV, and filtration efficiency, pressure drop, and strength are lowered. , The fine dust filter (PBI-BP 10% by weight) absorbs and blocks UV by the benzophenone, which is a UV blocker, and the fine dust filter is protected from UV and hardly causes physical damage, so filtration efficiency, pressure It is possible to minimize the drop and decrease in strength.

Therefore, in the fine dust filter according to the present invention, even when exposed to long-wavelength and short-wavelength ultraviolet rays for a long time, the nanofiber 200 is protected by the benzophenone, thereby securing superior UV resistance than the PBI filter. It means that fine dust can be reliably filtered in the long term even when exposed to external environments such as

Referring to FIG. 10 , the fine dust filter 10 may secure the stability of the nanofiber 200 from strong acids.

First, referring to (a) of FIG. 10 , the filtration efficiency and pressure drop of the fine dust filter 10 securing excellent resistance to UV were measured before and after immersion in strong acid. was used, and as a result of checking the filtration efficiency for PM2.5 after immersing the fine dust filter 10 for 60 minutes, the filtration efficiency and pressure drop were similar to those before the strong acid treatment. The stress strain of the fine dust filter 10 before and after immersion was measured, and a stress strain curve similar to that before immersion in strong acid was maintained. Accordingly, it can be confirmed that the fine dust filter 10 has excellent chemical stability.

Also, referring to (c) of FIG. 10 , the FT-IR of the fine dust filter 10 before and after immersion in a strong acid was measured. The peak of the fine dust filter 10 before immersion and the fine dust immersed in a strong acid Since the peaks of the filter 10 are almost similar, it means that the chemical bonding of the fine dust filter 10 is not affected by the strong acid, which means that the fine dust filter 10 has excellent chemical resistance. .

Subsequently, referring to FIG. 11 , the filtration efficiency of the fine dust filter (PBI-BP 10% by weight) and other controls was measured before and after immersion in strong acid, and all five filters showed excellent filtration efficiency before immersion in strong acid, After immersion in strong acid, it can be seen that, in all acids, only the fine dust filter (PBI-BP 10% by weight) and the PBI filter maintain filtration efficiency, which is basically due to the polybenzimidazole having excellent chemical durability. can be confirmed as

Referring to FIG. 12 , the fine dust filter 10 may secure the stability of the nanofiber 200 from high temperatures.

First, (a) of FIG. 12 is an apparatus for testing the heat resistance of the fine dust filter 10, in which the fine dust filter 10 on a hot plate can be heated to 400°C.

12(b) shows the filtration efficiency and pressure drop of the fine dust filter 10 according to the temperature change. Even when the temperature is increased to 400° C., the filtration efficiency of the fine dust filter 10 is the same as at low temperature. It can be seen that the high level of 96% is maintained at high temperature, and the pressure drop is also maintained at a constant level without change at high temperature at low temperature. ), it can be seen that the same strength is exhibited regardless of the temperature, which means that the fine dust filter 10 has excellent heat resistance, and can filter air with high efficiency even at high temperatures. it means.

For example, referring to FIG. 13 , the fine dust filter 10 is installed at the exhaust port of a motorcycle to photograph before and after filtering of exhaust gas. With the SEM image of the fine dust filter 10 before and after filtration, it is possible to check an intact state without foreign substances and damage to the nanofiber 200 of the fine dust filter 10 before filtration, and after filtration, combustion of motorcycle fuel Accordingly, it can be confirmed that the organic compound is discharged and filtered by the fine dust filter 10, and it can be seen that there is no damage such as breakage in the nanofiber 200, which is seen in part, so that the fine dust filter 10 is damaged even at high temperature. It can be confirmed that filtration of organic substances is possible without

Here, referring to FIG. 15 , the chemical composition of the motorcycle exhaust gas filtered by the fine dust filter 10 is analyzed by X-ray photoelectron spectroscopy, and the peak of the C 1 -s signal is C-C (284.6 eV) and C—O (286.5 eV) bonding, two main peaks are identified, which can be generally observed from organic particles produced by combustion of gasoline. It may be useful for filtration of particles.

In addition, referring to FIG. 16 , the filtration efficiency and pressure drop of motorcycle exhaust gas according to the light transmittance of the fine dust filter 10 are shown. It can be seen that the lower the light transmittance, the higher the filtration efficiency and pressure drop, The fine dust filter 10 may secure a filtration efficiency of 80% or more and a pressure drop of 50 kPa or more when the light transmittance is 50%.

In the above, an embodiment of the fine dust filter according to the present invention has been described, and below, a method of manufacturing the fine dust filter according to another embodiment of the present invention will be described.

Referring to FIG. 17 , the method of manufacturing the fine dust filter 10 including the polyester mesh 100 and the nanofiber 200 according to another embodiment of the present invention includes a solution preparation step (S100) and a solution input step (S200). ), a mesh preparation step (S300), a nanofiber forming step (S400), and a filter separation step (S500) may be included.

The solution preparation step (S100) is a step of preparing a polymer solution by mixing the polybenzimidazole and benzophenone, and ultraviolet rays caused by sunlight by using polybenzimidazole excellent in heat resistance and chemical resistance and benzophenone as a UV blocker , high temperature, from the external environment such as acid rain, the durability of the nanofiber 200 may be excellent.

Here, the solution preparation step (S100) may include a polybenzimidazole solution preparation step (S110).

The polybenzimidazole solution preparation step (S110) is a step of preparing a 16 wt% polybenzimidazole solution, and can be prepared by dissolving 16 wt% of the polybenzimidazole using dimethylacetamide as a solvent. have.

In addition, the solution preparation step (S100) may further include a benzophenone mixing step (S120).

The benzophenone mixing step (S120) is a step of mixing the polybenzimidazole solution and the benzophenone in a weight ratio of 9: 1, 16% by weight of the polybenzimidazole solution is added in a weight ratio of 9, and the By adding benzophenone in a weight ratio of 1, the polymer solution containing 10% by weight of the benzophenone may be prepared.

The polymer solution prepared in this way has excellent heat resistance and chemical resistance by the polybenzimidazole, and excellent UV resistance by the benzophenone, so that it is durable from external environments such as high temperature and acid rain caused by sunlight. The excellent nanofiber 200 can be manufactured.

Here, the benzophenone is a UV blocker, and UV is absorbed and blocked by hydroxyl (Hydroxyl, -OH), which is a functional group that absorbs UV, which is UV, and can be blocked by absorbing UV by being contained in the polymer solution. It is possible to protect the dazole can improve the durability of the nanofiber.

The solution injecting step (S200) is a solution injecting step of injecting the polymer solution into a syringe, and the polymer solution is injected into a 10ml syringe equipped with a 23 gauge metal needle tip, and may be mounted on an electrospinning device.

The mesh preparation step (S300) is a step of preparing a polyester mesh 100 in a metal collector electrically grounded with the sealage, and the polymer solution is electrospun on the upper surface of the polyester mesh 100, so that the nanofiber (200) can be formed.

The nanofiber forming step (S400) is a step of radiating the polymer solution to the polyester mesh 100 by applying a voltage to the syringe and the metal collector, the injection rate is 0.2ml/h, the metal needle tip and the metal collector The distance between them may be set to 10 cm, and the polymer solution may be spun onto the polyester mesh 100 by applying a high voltage of 14 kV/cm to form the nanofiber 200, and the injection speed, distance And when forming the nanofiber 200 by setting the voltage, it is possible to form the nanofiber 200 having an average diameter of 250 nm.

Here, referring to FIG. 18, the fine dust filter having different light transmittances (T) of 80%, 65%, and 50% by varying the electrospinning time of the polymer solution containing 10% by weight of the benzophenone ( 10), the light transmittance of the fine dust filter 10 may vary depending on the electrospinning time, and here, an external object can be clearly distinguished even with a light transmittance of 50%.

In addition, referring to FIG. 19 (a), the filtration efficiency according to the diameter of the nanofiber 200 was measured by setting the initial pressure drop to 65 Pa, and the nanofiber 200 having an average diameter of 140 nm and 250 nm. Although the PM2.5 filtration efficiency of all is excellent at 96%, the nanofiber 200 having an average diameter of 450 nm can confirm a relatively low filtration efficiency.

Here, referring to FIG. 19(b), the ratio of the filtration speed of the particles to the pressure drop of the fine dust filter 10 is expressed as a figure of merit (QF), and the optimal diameter of the nanofiber 200 is determined. In order to do this, each figure of merit (QF) was calculated, where the highest value was found to be a diameter of 250 nm, so the nanofiber 200 of the fine dust filter 10 contained 10% by weight of the benzophenone. As long as the polymer solution is electrospinning with the setting of the injection speed, distance, and voltage, it can be formed with an optimal diameter.

Again, referring to FIG. 17, the filter separation step (S500) is a step of separating the polyester mesh 100 from the metal collector, in which the nanofiber 200 formed by electrospinning the polymer solution is laminated. The fine dust filter 10 may be manufactured by separating the polyester mesh 100 from the electrospinning device.

Although preferred embodiments of the present invention have been described with reference to the drawings as described above, those of ordinary skill in the art will present the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. can be modified or changed in various ways.

10: fine dust filter
100: polyester mesh
200: nanofiber
S100: solution preparation step
S110: polybenzimidazole solution preparation step
S120: benzophenone addition step
S200: solution input step
S300: Mesh preparation stage
S400: nanofiber formation step
S500: filter separation step

Claims (6)

polyester mesh;
Including; nanofibers laminated on the polyester mesh;
The nanofiber is
It is formed by electrospinning a polymer solution containing polybenzimidazole and benzophenone,
The polymer solution is
A fine dust filter comprising 10% by weight of the benzophenone based on the total weight. The method of claim 1,
The polymer solution is
A fine dust filter comprising 16% by weight of a polybenzimidazole solution. 3. The method of claim 2,
The polybenzimidazole solution is
including dimethylacetamide;
A fine dust filter, characterized in that 16% by weight of the polybenzimidazole is dissolved based on the total weight. In the method for manufacturing a fine dust filter comprising a polyester mesh and nanofibers, wherein the nanofibers include polybenzimidazole and benzophenone,
A solution preparation step of preparing a polymer solution by mixing the polybenzimidazole and benzophenone;
a solution input step of introducing the polymer solution into a syringe;
Mesh preparation step of preparing a polyester mesh in the metal collector electrically grounded with the syringe;
Nanofiber forming step of spinning the polymer solution on the polyester mesh by applying a voltage to the syringe and the metal collector; and
A filter separation step of separating the polyester mesh on which the nanofibers are formed from a metal collector;
The solution preparation step is
A method of manufacturing a fine dust filter, comprising mixing 10 wt% of the benzophenone based on the total weight of the polymer solution. 5. The method of claim 4,
The solution preparation step is
A method for producing a fine dust filter, comprising the step of preparing a polybenzimidazole solution containing 16 wt% of the polybenzimidazole. 6. The method according to claim 4 or 5,
The method of manufacturing a fine dust filter, characterized in that the average diameter of the nanofiber is 250nm.

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