KR102248182B1 - Fine dust filter for windows and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a fine dust filter for windows and doors and a method of manufacturing the same, and more particularly, as a fine dust filter for windows and doors including a net structure of nanofibers attached to a screen and a screen, wherein the fine dust filter for windows and doors is a nanofiber A fine dust filter for windows and doors with excellent fine dust removal efficiency including nanofibers containing dielectric inorganic particles coated with polyvinylpyrrolidone, and can be easily applied to window frames. And it relates to a method of manufacturing the same.

Description

Fine dust filter for windows and method for manufacturing the same}

The present invention relates to a fine dust filter for windows and doors and a method of manufacturing the same, and more particularly, as a fine dust filter for windows and doors including a net structure of nanofibers attached to a screen and a screen, wherein the fine dust filter for windows and doors is a nanofiber A fine dust filter for windows and doors with excellent fine dust removal efficiency including nanofibers containing dielectric inorganic particles coated with polyvinylpyrrolidone, and can be easily applied to window frames. And it relates to a method of manufacturing the same.

When living for a long time by sealing the indoor space with windows, various dusts, microorganisms, and various pollutants (formaldehyde, volatile organic matter, asbestos powder, radon) discharged from indoor building materials float in the air in the indoor space. It causes diseases and various allergies, and causes diseases such as headache, cough, skin disease, and cancer.

Therefore, it is important to ventilate the indoor air by ventilating the interior and exterior.If the window is opened during this ventilation process, external dust and flying insects infiltrate, as well as heavy metals in the air entering the interior, thereby damaging health. Occurred.

In particular, particulate matter (PM) in the air can pose a threat to people's health. PM is a complex mixture of tiny particles and droplets. PM is classified as PM2.5 and PM10 based on the particle size, and these refer to particle sizes of 2.5 μm and less than 10 μm, respectively. Since PM2.5 and PM10 contaminants can penetrate human bronchi and lungs due to their small size, prolonged exposure to PM2.5 and PM10 increases prevalence and mortality.

Accordingly, for example, Korean Patent Laid-Open Publication No. 10-2012-0003992 discloses an insect repellent net having a function to purify air by generating plasma as well as an insect repellent function to prevent the invasion of insects.

However, since the above screen is a double net outside and inside, it has to use multiple frames, such as applying'+' to one side and'-' electrode to the other, so the composition is complicated and bulky, so it is easily applied to the existing window frame. There was this difficult problem.

Therefore, in order to solve the above problems, it is urgently required to develop a fine dust filter for windows that can be easily applied to a window frame and has excellent fine dust removal efficiency.

KR 10-2012-0003992 A (2012. 1. 12.)

The present invention was conceived to solve the above-described problems, and an object of the present invention is to provide a fine dust filter for windows and doors that can be easily applied to a window frame and has excellent fine dust removal efficiency, and a method of manufacturing the same.

The present invention for realizing the object as described above is a fine dust filter for windows and doors including a network structure of nanofibers attached to a screen and a screen, wherein the nanofibers contain 3 dielectric inorganic particles coated with polyvinylpyrrolidone. It provides a fine dust filter for windows and doors containing -50% by weight.

In addition, the present invention A) coating the dielectric inorganic particles with polyvinylpyrrolidone; B) preparing a spinning solution containing 1-20% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone; And C) electrospinning the spinning solution on a screen to attach a network structure of nanofibers to the screen.

The fine dust filter for windows and doors of the present invention according to the configuration as described above has an effect that can be easily applied to a window frame with a simple construction such as installation of an insect screen, since a network structure of nanofibers is attached to a screen.

The fine dust filter for windows and doors of the present invention includes nanofibers including dielectric inorganic particles coated with polyvinylpyrrolidone, and has excellent fine dust removal efficiency.

In addition, the fine dust filter for windows and doors of the present invention has excellent dispersibility of dielectric inorganic particles in nanofibers since no precipitate is generated under the spinning solution.

1 is a photograph of a fine dust filter for windows and doors of the present invention according to light transmittance.
2 is a schematic diagram of a method of manufacturing a fine dust filter for windows and doors according to an embodiment of the present invention.
3 is a thermogravimetric analysis (TGA) graph for analyzing the content of dielectric inorganic particles (BaTiO _{3) coated with polyvinylpyrrolidone in nanofibers.}

Hereinafter, the present invention will be described in detail together with the accompanying drawings of the present invention.

The present invention is a fine dust filter for windows and doors comprising a net structure of nanofibers attached to a screen and a screen, wherein the nanofibers contain 3-50% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone It relates to a fine dust filter for use.

The insect screen may be made of one or more selected from metals, synthetic resins, and inorganic fibers.

The metal may be one or more selected from the group consisting of copper, aluminum, and stainless steel, for example.

The synthetic resin may be one or more selected from the group consisting of polyester and nylon including polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, and polybutylene terephthalate, for example.

The inorganic fibers may include glass fibers as an example.

The insect screen may have a mesh structure in which wires are arranged at regular intervals in the horizontal and vertical directions to form a grid having a predetermined size.

The diameter of the wire may be 110-140μm, or 120-130μm. If the diameter of the wire is less than the above range, the strength of the wire is low and there is a risk of breakage. If the diameter of the wire is greater than the above range, the strength may be higher than necessary and the material cost may increase.

The size of the grid of the insect screen may be 310-340 μm×310-340 μm or 320-330 μm×320-330 μm. When the size of the grid is less than the above range, ventilation may be reduced, and when the size of the grid exceeds the above range, contaminants excluding large contaminants and pests may be allowed to enter the indoor space.

The dielectric inorganic particles are added to increase filtration performance, for example, BaTiO ₃ , TiO ₂ , SiO ₂ , Al ₂ O ₃ , V ₂ O ₃ , ZnO ₂ , La ₂ O ₃ , HfO ₂ , SrTiO ₃ , And Nb ₂ O _{5 It} may be one or more selected from the group consisting of.

The dielectric constant of the dielectric inorganic particles may be 1000-1600, or 1200-1400. The dielectric constant of the material can usually expressed as a value relative to the relative permittivity ε _r of, that is the vacuum permittivity. This value is often referred to as the dielectric constant (誘電常數). The actual permittivity can be obtained by multiplying the relative permittivity by the permittivity ε _{0 of the vacuum (ε = ε r} ε ₀ ). The larger the dielectric constant of a material, the greater the static power, and the filtering performance by the constant power can be improved. As a specific example, the dielectric inorganic particles may be _{BaTiO 3 having a dielectric constant of 1200.}

When preparing the spinning solution to include the dielectric inorganic particles in the nanofibers, the dielectric inorganic particles are not uniformly dispersed in the spinning solution and sink into a sediment, so that even if the electrospinning nozzle is blocked or spun, it is well formed into nanofibers. It may not be. In particular, as the content of the dielectric inorganic particles increases, the dispersibility may further decrease. Therefore, the dielectric inorganic particles may be coated in order to improve the dispersibility of the dielectric inorganic particles in the nanofibers.

Examples of the nanofibers include polyvinylidenefluoride, polyethersulfone, polysulfone, polyacrylonitrile, polyimide, polyamideimide, It may include at least one resin selected from the group consisting of polyurethane, polystyrene, polyarylsulfone, and ethylene chloro-trifluoroethylene.

The dipole moment of the resin may be 5-12 Debye (D), or 6-10D. Since the surface of the fine dust has a polar functional group, the greater the dipole moment of the resin, the greater the ability to electrically collect fine dust.

The melting point of the resin may be 300-400°C, or 320-380°C. The resin may have a melting point in the above range and have thermal stability at a temperature of 50-300° C., which is a fine dust discharge temperature range.

As a specific example, the resin may be a polyimide having a dipole moment of 6.16D and a melting point of 300-400°C.

The diameter of the nanofibers can be adjusted by changing the concentration of the spinning solution and the applied voltage, and the diameter of the nanofibers may be 10-900nm, or 100-800nm, or 300-500nm. As the diameter of the nanofibers is smaller, the usable specific surface area increases, so that the fine dust removal efficiency of the fine dust filter for windows and doors can be increased. Can be removed efficiently.

The nanofibers may include 3-50% by weight, or 3-48% by weight of the dielectric inorganic particles coated with polyvinylpyrrolidone. When the dielectric inorganic particles coated with polyvinylpyrrolidone are included in less than the above range, the fine dust removal efficiency of the fine dust filter for windows and doors including the same may be reduced. In addition, the nanofibers are prepared by electrospinning a spinning solution containing dielectric inorganic particles coated with polyvinylpyrrolidone, and an excessive amount of dielectric inorganic particles coated with polyvinylpyrrolidone in the spinning solution In this case, the dielectric inorganic particles coated with polyvinylpyrrolidone may not be uniformly dispersed and settle as a precipitate, so that even if the electrospinning nozzle is clogged or spun, it may not be well formed into nanofibers. Therefore, the nanofibers cannot include dielectric inorganic particles coated with the polyvinylpyrrolidone in excess of the above range.

The basis weight of the network structure of the nanofibers may be 0.01-0.2g/m ² , or 0.01-0.1g/m ² . Basis Weight or Grammage may be defined as mass per unit area, that is, grams per square meter as a preferred unit (g/m ^{2 ).} When the basis weight of the network structure of the nanofibers is less than the above range, mechanical properties may be deteriorated, and when it is exceeded the above range, productivity may be reduced.

The fine dust filter for windows and doors may have a light transmittance of 50-95%, 60-93%, or 70-90%. The light transmittance may be an average value of light transmittance obtained by weighting an AM (Air Mass) 1.5 solar spectrum of 400 to 800 nm. When the light transmittance of the fine dust filter for windows is less than the above range, it may be difficult to secure visibility and breathability, and if it exceeds the above range, the fine dust removal efficiency may be lowered. (See Fig. 1)

The fine dust filter for windows and doors may have a PM2.5-based quality factor (QF) of 0.05-0.8Pa ^-1 or 0.06-0.65Pa ^-1 at a light transmittance of 50-95%. As the specific example, in a light transmittance of 52% QF it may be 0.055-0.16Pa ^-1, or 0.06-0.14Pa ^-1. As another specific example, at a light transmittance of 89%, QF may be 0.23-0.6 Pa ^-1 , or 0.25-0.59 Pa ^-1 .

The overall performance of the filter considering both efficiency and pressure drop can be evaluated by QF, and the higher the QF, the better the filter performance. The QF may be defined as QF = -ln(1-E)/ΔP. E is the fine dust removal efficiency, and ΔP is the pressure drop of the filter. Within the QF range, the fine dust filter for windows and doors may implement excellent fine dust removal efficiency and breathability.

The fine dust filter for windows and doors may have a fine dust (PM 2.5) removal efficiency (E) of 81-98%, or 81.5-97% at a light transmittance of 50-95%. As a specific example, the removal efficiency of fine dust (PM 2.5) at a light transmittance of 52% may be 81-98%, or 81.5-97%. As another specific example, the efficiency of removing fine dust (PM 2.5) at a light transmittance of 89% may be 80-96%, or 81-95.5%.

The fine dust filter for windows and doors may exhibit the above-described fine dust removal efficiency due to a large electrical attraction between the dielectric inorganic particles coated with polyvinylpyrrolidone and nanofibers including resin. (See Table 1)

The fine dust filter for windows and doors may have a pressure drop of 5-27Pa, or 5.5-26.5Pa at a light transmittance of 50-95%. As a specific example, the pressure drop at 52% light transmittance may be 25-30Pa, or 26-28Pa. As another specific example, the pressure drop at 89% light transmittance may be 5.5-6.5Pa, or 5.8-6.2Pa.

On the other hand, the pressure drop increases as the flow velocity of air increases, and the pressure drop of the fine dust filter for windows is a result of measuring wind at a wind speed of 0.21 m/s per unit area. The fine dust filter for windows and doors of the present invention may exhibit the pressure drop as described above under the above wind speed conditions, thereby implementing excellent air permeability.

A method for manufacturing a fine dust filter for windows and doors includes: A) coating dielectric inorganic particles with polyvinylpyrrolidone; B) preparing a spinning solution containing 1-20% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone; And C) attaching a network structure of nanofibers to the screen by electrospinning the spinning solution to the screen. (See Fig. 2)

The step of coating the inorganic dielectric particles with A) polyvinylpyrrolidone may include: a) preparing a solution containing the inorganic dielectric particles; b) adding polyvinylpyrrolidone to the solution; And c) washing and drying the precipitate formed by stirring and centrifuging the solution to which the polyvinylpyrrolidone is added.

The step a) may be a step of dispersing a solution obtained by adding dielectric inorganic particles to ethanol for 1-2 hours by a sonication method.

In the step b), polyvinylpyrrolidone is added to the solution in a weight ratio of 0.7:1 to 1.3:1, or 0.8:1 to 1.2:1 with the dielectric inorganic particles, and then for 1-2 hours by sonication method. It may be a step of dispersing during. If the polyvinylpyrrolidone is contained in an amount less than the weight ratio, the effect of improving the dispersibility of the dielectric inorganic particles with respect to the nanofibers may be insignificant, and if it is contained in an amount exceeding the weight ratio, polyvinylpyrrolidone is contained in the solution. Since they are not dispersed and aggregated, it may be difficult for the dielectric inorganic particles to be coated with the polyvinylpyrrolidone.

In the step c), the solution to which the polyvinylpyrrolidone is added is stirred at room temperature for 22-26 hours so that the polyvinylpyrrolidone is completely coated on the surface of the dielectric inorganic particles, and then at 5000 rpm for 10-30 minutes. It may be a step of washing and lyophilizing the precipitate generated by centrifugation during the period with distilled water.

The polyvinylpyrrolidone may be coated to a thickness of 3-10 nm or 4-8 nm on the surface of the dielectric inorganic particles. The polyvinylpyrrolidone may be coated on the surface of the dielectric inorganic particles to a thickness within the above range, thereby implementing excellent dispersibility for the nanofibers.

The step of preparing a spinning solution containing 1-20% by weight of dielectric inorganic particles coated with B) polyvinylpyrrolidone is to prepare a resin solution by dissolving the resin in DMF (Dimethyl Formamide), and then in the solution. It may be a step of preparing a spinning solution by adding the dielectric inorganic particles coated with polyvinylpyrrolidone and stirring for 4-6 hours.

The step of attaching the network structure of nanofibers to the insect screen by electrospinning the spinning solution to the C) insect screen is to load the spinning solution using a 16 mm inner diameter, 12 mL volume syringe with a 21-gauge needle tip, and a syringe pump. After pumping the spinning solution from the needle tip by using, electrospinning the spinning solution directly to the screen may be a step of attaching a network structure of nanofibers to the screen.

Hereinafter, preferred embodiments are presented to aid in the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

Example

Example 1

A) coating dielectric inorganic particles with polyvinylpyrrolidone

_{After adding 10 g of BaTiO 3} to 250 mL of 94% by weight of ethanol, sonication for 1 hour to disperse, polyvinylpyrrolidone (MW=360,000 g/mol, Sigma Aldrich, CAS#9003-39-8) Was added so as to have a weight ratio of 1:1 with _{BaTiO 3 and then sonicated for 1 hour to further disperse.} Thereafter, the solution was stirred at room temperature for 24 hours so that _{polyvinylpyrrolidone was completely coated on BaTiO 3} to a thickness of 6 nm, and then the precipitate obtained by centrifugation at 5000 rpm for 20 minutes was washed 4-5 times with distilled water. And lyophilized.

B) preparing a spinning solution containing 20% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone

After dissolving 0.903 g of polyimide (Alfa Aesar, CAS#62929-02-6) in 5 mL of DMF (Duksan Reagents, CAS#68-12-2) to prepare a 16% by weight polyimide solution, _{BaTiO 3} coated with vinylpyrrolidone was added to contain 20% by weight and stirred for 5 hours to prepare a spinning solution.

C) attaching the network structure of nanofibers to the insect screen by electrospinning the spinning solution to the screen

The spinning solution was loaded using a 16 mm inner diameter, 12 mL volume syringe with a 21-gauge needle tip and connected to a voltage supply (ES30P-5W, Gamma High Voltage Research). The spinning solution was pumped from the needle tip using a syringe pump (KD Scientific). The spinning solution was electrospun onto the grounded copper mesh to attach a network structure of nanofibers. The wire diameter of the copper mesh was 127 μm, and the size of the grid of the copper mesh was 322.45 μm x 324.12 μm. During electrospinning, nanofibers were placed across the mesh hole to form a fine dust filter for windows and doors. At this time, the diameter of the nanofibers was 391 nm, and the basis weight of the network structure of the nanofibers was 0.05 g/m ² .

Here, 46.1% by weight _{of BaTiO 3} coated with polyvinylpyrrolidone was included in the nanofibers of the fine dust filter for windows and doors.

Example 2

In the step B), a fine dust filter for windows and doors was prepared in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to the polyimide solution in an amount of 7% by weight to prepare a spinning solution.} Formed.

Here, the nanofibers contained 27.4% by weight _{of BaTiO 3 coated with polyvinylpyrrolidone.}

Example 3

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 1% by weight to prepare a spinning solution.} I did.

Here, the nanofibers contained 3% by weight _{of BaTiO 3 coated with polyvinylpyrrolidone.}

Example 4

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 3% by weight to prepare a spinning solution.} I did.

Here, the nanofibers contained 10% by weight _{of BaTiO 3 coated with polyvinylpyrrolidone.}

Example 5

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 5% by weight to prepare a spinning solution.} I did.

Here, the nanofibers contained 19.3% by weight _{of BaTiO 3 coated with polyvinylpyrrolidone.}

Example 6

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 10% by weight to prepare a spinning solution.} I did.

Here, 34.5% by weight _{of BaTiO 3} coated with polyvinylpyrrolidone was included in the nanofibers.

Comparative Example 1

For windows and doors in the same manner as in Example 1, except that the step A) was not included, and BaTiO _{3 coated with polyvinylpyrrolidone in step B) was not added to the polyimide solution to prepare a spinning solution.} A fine dust filter was formed.

Comparative Example 2

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 0.5% by weight to prepare a spinning solution.} I did.

Here, the nanofibers contained 1.2% by weight _{of BaTiO 3 coated with polyvinylpyrrolidone.}

Comparative Example 3

In the step B), a fine dust filter for windows and doors was formed in the same manner as in Example 1, except that _{BaTiO 3 coated with polyvinylpyrrolidone was added to a polyimide solution in an amount of 25% by weight to prepare a spinning solution.} I did.

Reference Example 1

Without including the step A), in step B _{) 0.58 g of polyacrylonitrile (M w} =150,000, Sigma Aldrich, CAS#25014-41-9) was added to DMF (Duksan Reagents, CAS#68-12-2). ) After dissolving in 5 ml to prepare a polyacrylonitrile solution having a concentration of 11% by weight, BaTiO ₃ was not added and the polyacrylonitrile solution was used as a spinning solution, except that the window and door were used in the same manner as in Example 1 A fine dust filter was formed.

The grades of the materials used in the Examples, Comparative Examples, and Reference Examples are as follows.

-Polyimide (Alfa Aesar, CAS#62929-02-6)

-Ethanol (OCI company Ltd Korea, CAS#64-17-5)

-Polyvinylpyrrolidone (M _w =360,000, Sigma Aldrich, CAS#9003-39-8)

-DMF (Duksan Reagents, CAS#68-12-2)

-Polyacrylonitrile (M _w =150,000, Sigma Aldrich, CAS#25014-41-9)

_{-Above, the content of BaTiO 3} coated with polyvinylpyrrolidone in the nanofibers of the fine dust filters for windows and doors of Examples 1 to 6 and Comparative Example 1 was measured through thermogravimetric analysis, specifically before heating. It is a value converted into% by measuring the weight of the nanofibers at 800°C based on the weight of the nanofibers (see FIG. 3).

Test example

Dispersibility

The dispersibility of the spinning solutions of Examples 1 to 3 and Comparative Examples 2 to 3 was visually measured. When white precipitates were formed in the lower part of the spinning solution due to the occurrence of sinking dielectric inorganic particles, the dispersibility was evaluated as poor, and otherwise, the dispersibility was evaluated as being excellent and shown in Table 1.

When the dispersibility of the spinning solution is excellent, the dispersibility of the dielectric inorganic particles in the nanofibers may be excellent.

Light transmittance

The light transmittance of the fine dust filters for windows and doors of Examples 1 to 3, Comparative Examples 1 to 3, and Reference Example 1 was expressed as the average value of the light transmittance values obtained after weighting the AM1.5 solar spectrum of 400 to 800 nm.

Particulate Matter (PM) Removal Efficiency (E)

The PM2.5 removal efficiency was measured by comparing the concentration of the number of PM2.5 particles with and without the fine dust filters for windows and doors of Examples 1 to 3, Comparative Examples 1 to 2, and Reference Example 1, and is shown in Table 1. . The PM 2.5 concentration was measured using a portable particle counter (DT-9881, CEM instrument, India). The initial concentration was conducted at a concentration of more than ^{250 μg/m 3.}

As the PM 2.5 removal efficiency increases, the fine dust filter for windows and doors may exhibit excellent performance.

Pressure drop (ΔP)

The differential pressure gauge (EM201B, UEi test instrument) was used to measure the pressure difference across the fine dust filter for windows and doors of the wind at a wind speed of 0.21 m/s per unit area of Examples 1 to 3, Comparative Examples 1 to 2, and Reference Example 1. It was measured and the pressure drop was measured and shown in Table 1.

As the pressure drop is lower, the fine dust filter for windows and doors may exhibit excellent ventilation.

Quality Factor (QF)

The QF of the fine dust filters for windows and doors of Examples 1 to 3, Comparative Examples 1 to 2, and Reference Example 1 was calculated by QF = -ln(1-E)/ΔP and shown in Table 1.

As the QF increases, the fine dust filter may exhibit excellent performance.

Sample Dispersibility Light transmittance (%) PM 2.5 removal efficiency (%) Pressure drop (Pa) QF(Pa ^-1 )
PM2.5 standard Example 1
Great 89 95.3 6 0.5085 52 96.8 28 0.1230 20 98.4 57 0.0730 Example 2
Great 89 87.6 6 0.3477 52 92 28 0.0902 20 94.6 57 0.0512 Example 3
Great 89 82.3 6 0.2883 52 85.6 28 0.0692 20 93.1 57 0.0470 Comparative Example 1
- 89 68.1 6 0.1906 52 76 28 0.0510 20 90.5 57 0.0413 Comparative Example 2
Great 89 74.3 6 0.2264 52 78.3 28 0.0546 20 92.6 57 0.0457 Comparative Example 3 Bad 89 - - - 52 - - - 20 - - - Reference Example 1 - 89 62.3 6 0.1626 52 70.4 28 0.0435 20 82 57 0.0301

(The dispersibility test of the spinning solution of Comparative Example 1 and Reference Example 1 was not carried out, and the PM2.5 removal efficiency, pressure drop, and QF of the fine dust filter for windows and doors of Comparative Example 3 were not measured)

The fine dust filters for windows and doors of Examples 1 to 3 were excellent in dispersibility _{of BaTiO 3 coated with polyvinylpyrrolidone in nanofibers.} In addition, the fine dust filter for windows and doors was excellent in fine dust removal efficiency and QF, and exhibited a low pressure drop, and thus air permeability was excellent.

On the other hand, the fine dust filter for windows and doors of Comparative Example 1 _{did not contain BaTiO 3} coated with polyvinylpyrrolidone in the nanofibers, so the fine dust removal efficiency and QF were lowered compared to the examples.

On the other hand, the fine dust filter for windows and doors of Comparative Example 2 _{contained 1.2% by weight of BaTiO 3} coated with polyvinylpyrrolidone in the nanofibers, so that the fine dust removal efficiency was lowered compared to the Examples.

On the other hand, the fine dust filter for windows and doors of Comparative Example 3 used a _{spinning solution containing 25% by weight of BaTiO 3} coated with polyvinylpyrrolidone, and the spinning solution had poor dispersibility due to the formation of a precipitate in the lower portion. Therefore, when the spinning solution was electrospun due to the sediment of the spinning solution, the spinning process was not smooth, so it was impossible to manufacture a fine dust filter for windows and doors, and accordingly, it was not possible to measure the fine dust removal efficiency, pressure drop, and QF. .

On the other hand, the fine dust filter for windows and doors of Reference Example 1 is the resin used in Examples 1 to 6, using polyacrylonitrile having a small dipole moment value instead of polyimide, and coated with polyvinylpyrrolidone on nanofibers. Since BaTiO ₃ was not included, the efficiency of removing fine dust and QF were lowered.

Claims (15)

A fine dust filter for windows and doors comprising a net structure of nanofibers attached to a screen and a screen, wherein the nanofibers contain 3-50% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone,
The dielectric inorganic particles are BaTiO ₃ ,
The nanofiber is a fine dust filter for windows and doors that are polyimide (Polyimide). The method of claim 1,
The screen is made of one or more selected from metal, synthetic resin, and inorganic fiber fine dust filter for windows and doors. The method of claim 1,
The screen is a fine dust filter for windows and doors of which the diameter of the wire is 110-140μm, the size of the grid is 310-340μm x 310-340μm. delete delete delete delete The method of claim 1,
The nanofibers are fine dust filters for windows and doors of 10-900nm in diameter. The method of claim 1,
The fine dust filter for windows and doors has a light transmittance of 50-95%. The method of claim 1,
The fine dust filter for windows has a QF based on fine dust (PM2.5) of 0.055-0.16Pa ^-1 at a light transmittance of 52%, or 0.23- based on fine dust (PM2.5) at a light transmittance of 89%. A fine dust filter for windows and doors of 0.6Pa ^-1. The method of claim 1,
The fine dust filter for windows has an efficiency of removing fine dust (PM2.5) of 81-98% at a light transmittance of 52% or 80-96% of a fine dust (PM2.5) removal efficiency at a light transmittance of 89%. Fine dust filter for windows and doors. The method of claim 1,
The fine dust filter for windows and doors has a pressure drop of 25-30Pa at a light transmittance of 52% or a pressure drop of 5.5-6.5Pa at a light transmittance of 89%. A) coating the dielectric inorganic particles with polyvinylpyrrolidone; B) preparing a spinning solution containing 1-20% by weight of dielectric inorganic particles coated with polyvinylpyrrolidone; And C) attaching a network structure of nanofibers to the insect screen by electrospinning the spinning solution to the screen screen.
The method of manufacturing a fine dust filter for windows and doors, wherein the dielectric inorganic particles are BaTiO _{3 and the nanofibers are polyimide.} The method of claim 13,
The step A) comprises: a) preparing a solution containing dielectric inorganic particles; b) adding polyvinylpyrrolidone to the solution; And c) washing and drying the precipitate generated by stirring and centrifuging the solution to which the polyvinylpyrrolidone is added. The method of claim 14,
The solution is a method for producing a fine dust filter for windows and doors containing polyvinylpyrrolidone and dielectric inorganic particles in a weight ratio of 0.7:1 to 1.3:1.

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