KR20200035781A - Fiber materials for air filter - Google Patents

Abstract

The present invention relates to a fiber material for an air filter. By including polymer beads between microfibers constituting the fiber material in an optimized form, the thickness and the porosity of the fiber material are optimized simultaneously, and high particle removal efficiency and low differential pressure can be realized.

Description

Fiber material for air filters {FIBER MATERIALS FOR AIR FILTER}

The present invention relates to a fiber material for an air filter, and more specifically, includes a polymer bead between fine fibers constituting the fiber material to optimize the thickness and pore distribution of the fiber material to obtain high particle removal efficiency and low differential pressure characteristics. It relates to a fiber material for implementing an air filter and a method for manufacturing the same, and an air filter using the same.

Air purifiers are installed for the purpose of filtering and removing various foreign substances contained in the air from various devices such as internal combustion engines, gas turbines, air purifiers, and air conditioners, and various kinds of filter materials are installed as filter media in these air purifiers. .

The filter material mounted on the air purifier as described above filters the various foreign substances contained in the air supplied for the operation of the device, thereby guaranteeing the normal operation of the device and extending the life of the device. Therefore, it is essential for such a filter material to have a high filtration efficiency and a long filtration life at the same time to effectively collect foreign substances. However, in order to actually collect various foreign substances in the air, it is necessary to finely form the air vents of the filter material, in which case the air vents are closed early to shorten the filter life of the filter material.

On the contrary, if the air permeation of the filter material is largely formed, instead of extending the life of the filtration, fine foreign matters are discharged through the air perforation, thereby significantly reducing the filtering efficiency of the filter material. Therefore, there is an urgent need to develop a filter material for air purification having both a filtration efficiency for effectively collecting foreign substances and a long filtration life.

On the other hand, Japanese Patent Application No. 63-51725 discloses a nonwoven fabric in which a spunbond type nonwoven fabric is disposed on both sides of a meltblown nonwoven fabric as a nonwoven fabric used as a material fabric for an air purifier, and each fiber layer is bonded using a resin adhesive. In addition, Japanese Patent Application No. 62-2060 discloses a filter in which a spunbonded nonwoven fabric made of stretched fibers is bonded to a melt-blown nonwoven fabric in an unsolidified state.

However, in the conventional air filter material, the differential pressure is excessively high in the lamination process, and a lot of pressure loss is generated, and there is a limitation in improving the collection efficiency. In particular, in the case of three or more air filters having a material layer between supports, there is a problem in that pressure loss is significantly increased rather than an improvement in removal rate because lamination is performed for the purpose of imparting functionality.

In addition, the air filter material manufactured by using electrospinning is characterized by dense nanofibers and a thin thickness. As such, when the thickness of the air filter material is thin, it means a high filling rate of the fiber, which can achieve excellent removal efficiency, but has a disadvantage of blocking the flow of air and causing a differential pressure to rise. Moreover, when the nanofibers are manufactured by using the electrospinning method, as the fibers are laminated, the fibers are compressed to each other, so that the thickness increase width decreases and the filling rate increases. In order to solve this problem, inorganic particles (TiO ₂ , SiO ₂ ) may be used, but when using inorganic particles, a phenomenon such as agglomeration and separation of inorganic particles may occur in the manufacturing process.

Accordingly, there is a continuous need for the development of a fiber material for an air filter capable of effectively controlling the thickness of the fiber material without using separate inorganic particles and the like to achieve high particle removal efficiency and low differential pressure characteristics.

The present invention effectively optimizes the pore distribution along with the thickness of the fiber material without using separate inorganic particles and the like, and a method for manufacturing the fiber material for an air filter capable of realizing low differential pressure with high particle removal efficiency, and a method for manufacturing the same It is intended to provide an air filter using the same.

According to one embodiment of the invention, the diameter of the fiber comprises a fine fiber having a diameter of 550 nm to 2.0 µm, and polymer beads present between the fine fibers, and the diameter of the polymer bead is 5 µm to 10 µm, an air filter Dragon fiber material is provided.

In addition, according to another embodiment of the invention, by electrospinning or solution spinning (Solution blowing), to form fine fibers having a fiber diameter of 550 nm to 2.0 μm, and beads of polymer having a diameter of 5 μm to 10 μm. The step of forming between the fine fibers; includes, and provides a method for producing a fiber material for an air filter as described above.

In addition, according to another embodiment of the invention, there is provided an air filter equipped with a filter pack using the fiber material for the air filter as described above.

As described above, according to the present invention, by including the polymer beads between the fine fibers constituting the fiber material, there is an excellent effect that can realize the characteristics of low differential pressure with high particle removal efficiency by reducing the fiber filling rate.

1 is an electron micrograph of the fiber material for an air filter manufactured according to Example 1 of the present invention (left: 5,500 times magnification, right: 5,500 times magnification).
2 is an electron micrograph of the fiber material for an air filter prepared according to Comparative Example 1 of the present invention (left: 5,5000 times magnification, right: 4,000 times magnification).
FIG. 3 is a graph of pore structure distribution measured using a capillary flow porometer for an air filter fiber material prepared according to Example 1 and Comparative Example 1 of the present invention.

In the present invention, terms such as first and second are used to describe various components, and the terms are used only for the purpose of distinguishing one component from another component.

In addition, the terms used in this specification are only used to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "include", "have" or "have" are intended to indicate the presence of implemented features, numbers, steps, elements or combinations thereof, one or more other features or It should be understood that the existence or addition possibilities of numbers, steps, elements, or combinations thereof are not excluded in advance.

The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated and described in detail below. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

Hereinafter, the present invention will be described in more detail.

The present invention optimizes the thickness and pore distribution of the fiber material without using separate inorganic particles and the like, and a fiber material for an air filter capable of realizing low differential pressure with high particle removal efficiency and a method for manufacturing the same, and air using the same Filters are provided.

In particular, the present invention is to configure the polymer beads to be included in individual forms between the fine fibers constituting the fiber material, and by optimizing the diameter of the fine fibers and the polymer beads, the thickness of the fiber material without using separate inorganic particles or the like. And it is characterized in that it is possible to implement the characteristics of low differential pressure with high particle removal efficiency by adjusting the pore distribution.

According to one embodiment of the invention, the fiber material for the air filter is formed of fine fibers having a fiber diameter of 550 nm to 2.0 μm, and polymer beads having a bead diameter of 5 μm to 10 μm between the fine fibers. .

The fiber material for the air filter may be formed through an electrospinning method or a solution spinning method, which will be described later, to form a fiber aggregate having a structure intertwined with each other in the form of a nonwoven fabric. Here, the fiber material may be referred to as a fabric, a nonwoven fabric, or a filter material.

In the fiber material for air filters, the fine fibers are capable of achieving excellent removal efficiency with a high filling rate. Specifically, the diameter of the fine fibers is 550 nm to 2.0 μm, or 600 nm to 1.5 μm, or 700 nm to 1.2 μm. The average diameter of these fine fibers may be 750 nm to 1.3 μm, or 800 nm to 1.15 μm, or 850 nm to 1.0 μm. The diameter of the fine fibers should be 550 nm or more in terms of controlling the fiber filling rate, and should be 2.0 μm or less in terms of preventing a decrease in production speed when manufacturing fibers using electrospinning. When the diameter of the fine fibers is 550 nm or less, the fiber diameter fills the voids and affects the filling rate, so that an increase in differential pressure may occur.

In the fiber material for an air filter of the present invention, the term “fine fiber” refers to a fiber diameter of at least about 0.1 nm or about 0.5 nm when formed through a spinning method or a solution spinning method. The fine fiber used as the fiber material exists as an independent fiber, not a nano net shape such as a spider web, and has a long shape in a cylindrical shape with a continuous length of at least about 20 μm or more or about 30 μm without breaking the fiber length.

The fiber material for the air filter of the present invention may be in the form of only a fine fiber (nanofiber) and a polymer bead (bead) without the configuration of a nano net (nano net) as described above. In this way, the form composed of only the fine fibers (nanofiber) and the polymer bead (bead), can obtain an excellent effect in terms of reducing the pressure difference than the nano-net form. In the nano-net form, the size of the pores is very small, and thus it is highly likely that a high pressure difference occurs when used as an air filter fabric. In this case, energy efficiency may be reduced and noise may be generated in an actual use environment.

In addition, the polymer beads formed between the fine fibers can control the filling rate of the fine fiber air filter to smooth the flow of air to the fiber material for the air filter, so as to lower the pressure drop at similar removal efficiency. , Specifically, the diameter of the polymer beads may be 5 μm to 10 μm, or 5.15 μm to 8.5 μm, or 5.3 μm to 7 μm. Further, the average diameter of the polymer beads may be about 5 μm to about 8 μm, or about 5.2 μm to about 7 μm, and about 5.5 μm to about 6.5 μm. The diameter of the polymer bead oil should be 5 µm or more in order to secure a sufficient porosity, and should be 10 µm or less in terms of manufacturing a uniform fabric.

The polymer beads may be made of polyvinylidene difluoride (PVDF), polyethylene oxide (PEO), polyvinyl pyrollidone (PVP), or a mixture thereof.

In addition, the fine fibers are polyacrylonitrile (PAN, polyacrylonitrile), polyamide (Polyamid6, Polyamide 6,6), polyether sulfonic acid (PES, Polyethyer sulfone), polyurethane (Polyurethane), polyimide (Polyimide), poly Polybutylene succinate, Polyethylene oxide, Polyvinyl chloride, Polyvinyl alcohol (PVA), Polyethylene terephthalate, Cellulose acetate or the like It may be made of a mixture.

The polymer beads may be made of the same polymer component as the fine fiber, or may be made of a polymer component different from the fine fiber.

On the other hand, the polymer beads exist in a separate form rather than in an integrated form with the fine fibers, and may exist in a form physically separable from the fine fibers. This means that the fine fibers and the beads are not physically or chemically attached or bound. The form of the polymer bead can obtain an excellent effect in terms of filling rate control compared to the form integrated with the fine fibers. In the case of the integral type of fiber, if the size of the bead is included in the size of 5 µm or more, it is difficult to form fine fibers, and thus there is difficulty in productivity reduction and uniform fiber production.

The polymer beads may have various shapes such as a cone shape, a cylinder shape, a hexagonal shape, and a cubic shape, including a spherical shape.

The fiber material for the air filter of the present invention optimizes the diameters of the microfibers and the polymer beads so that the polymer beads are included between the microfibers in a separate form, effectively reducing the fiber filling rate, and with high particle removal efficiency and low differential pressure. You can implement

The fiber material for the air filter may have a collection efficiency of sodium chloride (NaCl) particles having a diameter of 0.3 µm of 85% or more, or 90% or more, or 95% or more under conditions of an applied air volume of 32 L / min (cotton wind velocity of 5.33 cm / sec). have.

In addition, the fiber material for the air filter may have a differential pressure measured from a pressure loss value before and after passing the fiber material under a condition of an applied air volume of 32 L / min (cotton wind velocity of 5.33 cm / sec) and may be 5.8 mmAQ or less in the range. Specifically, the fiber material for the air filter is 5.8 mmAQ or less in the removal efficiency range of 95% or more, or 4.0 mmAQ or less in the removal efficiency range of 90% or more and less than 95%, or 80% or more in the removal efficiency range of less than 90%. It can be less than or equal to 2.0 mmAQ in the range of removal efficiency of less than or equal to 3.5 mmAQ and less than 80%.

In general, the differential pressure in the air filter field has a very important effect on the clean air delivery rate, and particularly in the air cleaner field, determines energy efficiency and clean area. When an air filter with a high differential pressure is used, the supply of purified air decreases rapidly, and to compensate for this, the output of the fan attached to the air purifier must be increased. In this case, the power consumption of the air cleaner increases, and noise may occur. If the output of the fan is not changed, the cleanable area of the device to which the air filter is applied decreases rapidly, and in this case, it is difficult to purify the indoor air quality.

In particular, in the case of an air filter using a physical collection method, a high differential pressure is mostly generated, and thus there is a limit to the application of an indoor air purifier using an existing electrostatic nonwoven fabric filter. However, there is no reduction in dust removal performance by the surrounding environment compared to the electrostatic collection method, and it is possible to maintain a constant purification ability during the use period. The fiber material for an air filter of the present invention has a feature that can realize a low differential pressure even when using a physical collection method.

The fiber material for the air filter may have a fiber filling rate of about 0.01 to about 0.25.

The fiber material for the air filter, the basis weight calculated by measuring the area and weight of the fabric made of a fiber material is 20 g / m 2 to 50 g / m 2, or 25 g / m 2 to 45 g / m 2, or 30 g / It may be from m 2 to 40 g / m 2, and the thickness measured using a digital thickness meter (Mitutoyo, 507-401) may be 120 μm to 200 μm, or 130 μm to 180 μm, or 140 μm to 170 μm. The basis weight may be 20 g / m 2 or more in terms of particle collection efficiency of the filter, and when the basis weight exceeds 50 g / m 2, a differential pressure may be rapidly increased compared to particle collection efficiency. In addition, when the thickness is less than 120 µm compared to the basis weight, the differential pressure rapidly increases. The thickness compared to the basis weight is greatly increased, and if it exceeds 200 μm, particle collection efficiency may decrease, and the shape of the fabric may not be uniformly formed.

The fiber material for the air filter may have an average pore size of about 1.5 to about 4.5 μm, or about 1.8 to about 4.0 μm, or about 2.0 to about 3.8 μm. The average pore size may be 4.5 µm or less in terms of particle collection efficiency of the filter, and when it is less than about 1.5 µm, a differential pressure may be rapidly increased compared to particle collection efficiency. Here, the average pore size of the fiber material for the air filter is measured by a method using a capillary flow porometer (PMI, Porous materials, Inc, USA), and represented by Equation 1 below. The calculated value can be obtained automatically by the Washburn equation. At this time, a wet material (Galwick solution) having a surface tension of 45.9 dynes / cm can be used.

[Equation 1]

D = 4γ × cos θ × 1 / P

In the above formula 1,

D is the air filter fabric pore size (㎛),

γ is the surface tension of the solution used in the measurement (Galwick, 45.9 dynes / cm),

θ is the contact angle of the solution used for measurement,

P is the gas pressure applied in measurement (unit: psi).

When measuring the pore size of the fiber material, for example, a wet material having a surface tension of 45.9 dynes / cm (Galwick solution: Galwick, silwick, water) may be used, and air or nitrogen may be used as the gas. have. The surface tension (γ) of the solution may be 15 to 72 dynes / cm, the contact angle (θ) of the solution may be 0 to 180 degrees, and the gas pressure (P) applied during the measurement may be 0.01 to 100 psi. In particular, the solution used for the measurement of the pore size of a fiber material generally uses a solution that can be absorbed in the fiber material, so cos θ = 1 of Equation 1 is used.

Meanwhile, in another embodiment of the present invention, a method of manufacturing a fiber material for an air filter as described above is provided.

The manufacturing method of the fiber material for the air filter is an electrospinning method or a solution blowing method (Solution blowing) to form fine fibers having a fiber diameter of 550 nm to 2.0 μm, and polymer beads having a bead diameter of 5 μm to 10 μm. And forming between the fine fibers.

Here, the characteristics related to the fine fiber, the polymer beads, and the fiber material are as described above, and detailed description is omitted.

The electrospinning method is characterized by using an electrospinning device in the form of a nozzle, and can be performed using a solution for manufacturing microfibers and a solution for preparing polymer beads, respectively, using a conventional electrospinning device configured in the form of a nozzle.

In addition, the solution spinning method (Solution blowing) is characterized in that the use of high-pressure air to refine the fiber can be carried out using a solution for producing a fine fiber and a solution for producing a polymer fiber using a conventional solution spinning device, respectively. .

On the other hand, in another embodiment of the invention, an air filter equipped with a filter pack using the fiber material for the air filter as described above is provided.

The air filter includes a microfiber having a fiber diameter of 550 nm to 2.0 μm, and polymer beads present between the microfibers, and a filter pack using a fiber material having a diameter of the polymer bead of 5 μm to 10 μm. It is characterized by being mounted.

Here, the characteristics related to the fine fiber, the polymer beads, and the fiber material are as described above, and detailed description is omitted.

The air filter is characterized by a filter fabric used for particle removal, and the air filter may further include a mesh, a non-woven fabric, or a substrate for bending, which can be used as a protective layer.

Hereinafter, preferred embodiments are provided to help understanding of the present invention. However, the following examples are only provided to more easily understand the present invention, and the contents of the present invention are not limited thereby.

<Production of fiber materials for air filters>

Example  One

A fiber material for an air filter was prepared by simultaneously spinning polyacrylonitrile (PAN, polyacrylonitrile) and polyvinylidene difluroride (PVDF) using a Nano-5 Machine-5 device as an electrospinning device.

At this time, PVDF was dissolved in dimethylformamide (DMF) at a concentration of 10 wt% as a spinning solution for forming beads, and PAN was dissolved at a concentration of 11 wt% in DMF as a spinning solution for forming fine fibers. Then, each spinning solution containing PVDF and PAN was simultaneously electrospinned at a 30 kV voltage condition at an injection rate of 1.5 mL / hr. At this time, the nozzle diameter for bead formation was 0.86 mm, and the nozzle diameter for fine fiber formation was 0.86 mm, and electrospinning was performed using these nozzles as an electrospinning tool.

Example  2

The same method as in Example 1, except that the injection time of the spinning solution in the electrospinning process was varied to 50% compared to Example 1 to adjust the basis weight of the fiber material so that the performance was around 80%. As an air filter fiber material was prepared.

Comparative example  One

As an electrospinning device, PAN and PVDF were simultaneously spun using Nano NC's Machine-5 device to produce a fiber material for air filters.

At this time, PVDF was dissolved in DMF at a concentration of 10 wt% as a spinning solution for forming beads, and PAN was dissolved at 8 wt% in DMF as a spinning solution for forming fine fibers. Then, each spinning solution containing PVDF and PAN was electrospinned simultaneously at 30 kV voltage at a rate of 1.5 mL / hr. At this time, the nozzle diameter for forming beads was 0.41 mm, and the nozzle diameter for forming fine fibers was 0.86 mm, and electrospinning was performed using these nozzles as an electrospinning tool.

Comparative example  2

The same method as in Comparative Example 1, except that the injection time of the spinning solution was adjusted in the electrospinning process to change the solution injection amount to 50% compared to Comparative Example 1, so that the basis weight of the fiber material was adjusted to have a performance of about 80%. As an air filter fiber material was prepared.

Comparative example  3

At this time, PVDF was dissolved in dimethylformamide (DMF) at a concentration of 10 wt% as a spinning solution for forming beads, and PAN was dissolved at 8 wt% in DMF as a spinning solution for forming fine fibers. Then, each spinning solution containing PVDF and PAN was simultaneously electrospinned at a 30 kV voltage condition at an injection rate of 1.5 mL / hr. At this time, the nozzle diameter for bead formation was 0.86 mm, and the nozzle diameter for fine fiber formation was 0.86 mm, and electrospinning was performed using these nozzles as an electrospinning tool.

<Physical properties and performance evaluation of air filter fabric>

Test example  One

For the air filter fabric obtained according to Examples and Comparative Examples, physical properties were evaluated in the following manner and the results are shown in Table 1 below.

1) of fine fibers diameter  And polymers Bead diameter  (㎛)

After the platinum coating of the air filter fabric obtained according to Examples and Comparative Examples, an electron microscope analysis was performed using an electron scanning microscope (JSM-7610, HITACHI-S4800, Japan). The diameter of the fine fibers and the diameter of the polymer beads were measured using a photograph taken with an electron scanning microscope, and the average value of each was calculated. At this time, the fine fibers were targeted to fibers having a diameter of at least 0.1 nm and having a cylindrical shape, and polymer beads were targeted to beads having a diameter of at least 1 μm or more.

2) Average pore size (㎛)

The pore size was measured by a method using a capillary flow porometer (PMI, Porous materials, Inc, USA), and calculated using the Washburn equation represented by Equation 1 below.

[Equation 1]

D = 4γ × cos θ × 1 / P

In the above formula 1,

D is the air filter fabric pore size (㎛),

γ is the surface tension of the solution used in the measurement (Galwick, 45.9 dynes / cm),

θ is the contact angle of the solution used for measurement,

P is the gas pressure applied in measurement (unit: psi).

3) Fiber material Basis weight (Basis weight, g / ㎡)

Using a polyester (Polyester) nonwoven fabric as a substrate, three or more samples of 4 cm x 4 cm in size for the airbag fiber material of Examples and Comparative Examples including the substrate were prepared to measure the mass and calculate the average value. After measuring the substrate coated with only the adhesive in the same manner, the basis weight of the fiber material for the airbags of Examples and Comparative Examples was checked by a method that is excluded from the measured values.

4) Fiber material thickness (㎛)

Using a polyester (Polyester) non-woven fabric as a substrate, three or more samples of 4 cm x 4 cm of fiber material for airbags of Examples and Comparative Examples including a substrate were prepared and used a Mitutoyo thickness gauge, among the total area of the sample After equally dividing over 5 areas, the thickness was measured at the same location of each sample, and the average value was calculated.

Fine fiber
Diameter range
(㎛) Fine fiber
Average diameter
(㎛) Polymer beads
Diameter range
(㎛) Polymer beads average diameter
(㎛) Textile material
Basis weight
(g / ㎡) Textile material
thickness
(㎛) Average pore size
(㎛) Example 1 0.72 -1.13 0.95 5.65-6.21 5.96 37.17 163 2.33 Comparative Example 1 0.33-1.50 0.45 1.90-3.62 2.83 35.02 153 1.38 Example 2 0.72 -1.13 0.95 5.65-6.21 5.96 35.01 148 3.61 Comparative Example 2 0.33-1.50 0.45 1.90-3.62 2.83 32.19 139 2.6 Comparative Example 3 0.33-1.50 0.45 5.65-6.21 5.96 35.07 151 1.24

On the other hand, the graph of the pore structure distribution measured using a capillary flow porometer (Capillary flow porometer) for the air filter fiber material prepared according to Example 1 and Comparative Example 1 of the present invention is shown in FIG. As shown in the graph of FIG. 3, it can be seen that the fiber material for the air filter of Example 1 according to the present invention has almost all measured values distributed to a side larger than the average pore size of Comparative Example 1 of 1.38 μm. Accordingly, it can be seen that the fiber material for the air filter of Example 1 has an average pore size of 2.33 µm, which is significantly different.

Test example  2

For the air filter fabric obtained according to Examples and Comparative Examples, filter performance evaluation was performed in the following manner and the results are shown in Table 2 below.

1) Particle removal efficiency ( % )

Particle removal efficiency (%) was measured using an automated filter measurement device. At this time, it was measured at a flow rate of 32 L / min using the TSI 8130A equipment, a filter automation measurement device of TSI (USA). As the particles, NaCl was sprayed in the form of an Aerogel.

2) Foreclosure  ( mmAQ )

The differential pressure (mmAQ) was measured using an automatic filter measurement device. At this time, it was measured at a flow rate of 32 L / min (surface wind velocity 5.33 cm / sec) using TSI 8130A equipment, a filter automation measurement device of TSI (USA).

Particle removal efficiency (%) Differential pressure (mmAQ) Example 1 95.35 5.8 Comparative Example 1 99.10 9.7 Example 2 86.22 2.5 Comparative Example 2 88.40 4.0 Comparative Example 3 97.78 6.1

As shown in Table 2, in the case of Example 1 consisting of fine fibers having a polymer bead diameter of 5.65 to 6.21 μm and a fiber diameter of 720 nm to 1.13 μm according to the present invention, a polymer bead diameter of 1.90 to 3.62 μm and a fiber diameter of 330 nm The effect of improving the differential pressure by about 3 mmAQ can be confirmed at a particle removal efficiency similar to that of Comparative Example 1 composed of fine fibers of 1.50 µm. Particularly, in Comparative Example 1 in which the average diameter of the fine fibers was 450 nm, the thickness of the fiber material was about 10 μm lower than in Example 1, and the average pore size was also confirmed to be only 1.38 μm, indicating that the differential pressure was significantly increased. have. In addition, Example 2 was prepared to be applied to a medium performance filter by the same method as Example 1, and improved the differential pressure of about 1.5 mmAQ in the particle removal efficiency similar to Comparative Example 2 produced by the same method as Comparative Example 1. It showed an effect. As a result, in the case of the air filters to which Examples 1 and 2 according to the present invention are applied, it is possible to implement a low differential pressure while using a physical collection method, so that the supply of purified air is greatly increased, and excellent energy efficiency and clean area are provided. It can be seen that the reduction of dust removal performance by the surrounding environment does not occur, and it is possible to obtain an excellent effect of maintaining a constant purification ability during the use period.

On the other hand, in Comparative Example 3, although the diameter of the polymer beads was applied to 5.65 to 6.21 μm to the same extent as in Example 1, it was confirmed that the thickness of the filter material was reduced compared to Example 1 and the efficiency compared to the differential pressure was decreased. Through this, it can be seen that when the diameter of the microfibers on which the polymer beads are formed decreases, the pore structure decreases and the differential pressure increases.

Claims (11)

Fine fibers having a diameter of 550 nm to 2.0 µm, and polymer beads present between the fine fibers,
The diameter of the polymer beads is 5 ㎛ to 10 ㎛,
Fiber material for air filters.
According to claim 1,
The fine fiber has an average diameter of 750 nm to 1.3 μm, and the average diameter of the polymer beads is 5 μm to 8 μm,
Fiber material for air filters.
According to claim 1,
The polymer beads are made of polyvinylidene difluoride (PVDF), polyethylene oxide (PEO, Polyethylene oxide), polyvinylpyrrolidone (PVP, Polyvinyl pyrollidone), or a mixture thereof.
Fiber material for air filters.
According to claim 1,
The fine fiber is polyacrylonitrile (PAN, polyacrylonitrile), polyamide (Polyamid6, Polyamide 6,6), polyether sulfonic acid (PES, Polyethyer sulfone), polyurethane (Polyurethane), polyimide (Polyimide), polybutylene With succinate (Polybutylene succinate), Polyethylene oxide, Polyvinyl chloride, Polyvinyl alcohol (PVA), Polyethylene terephthalate, Cellulose acetate or mixtures thereof Characterized in that made,
Fiber material for air filters.
According to claim 1,
The polymer beads are characterized in that they exist in a form physically separable from the fine fibers,
Fiber material for air filters.
According to claim 1,
Characterized in that the collection efficiency of sodium chloride (NaCl) particles having a diameter of 0.3 μm under an applied air volume of 32 L / min is 85% or more,
Fiber material for air filters.
According to claim 1,
Characterized in that the differential pressure measured from the pressure loss value before and after passing the fiber material under the applied air flow rate of 32 L / min is 5.8 mmAq or less,
Fiber material for air filters.
According to claim 1,
Characterized in that the basis weight is 20 g / m 2 to 50 g / m 2 and the thickness is 120 μm to 200 μm,
Fiber material for air filters.
According to claim 1,
Characterized in that the average pore size is 1.5 to 4.5 μm,
Fiber material for air filters.
Forming microfibers having a fiber diameter of 550 nm to 2.0 μm and forming polymer beads having a bead diameter of 5 μm to 10 μm between the microfibers by electrospinning or solution blowing;
The manufacturing method of the fiber material for air filters containing.
An air filter equipped with a filter pack using the fiber material according to claim 1.

Images