KR102479112B1 - Electrostatic Force Regenerative Filter - Google Patents

Abstract

This application relates to a mask in which electrostatic force is regenerated by frictional electrification. More specifically, it relates to a filter in which a filler inside the filter continuously generates friction due to air flow or vibration inside and outside the filter, and thus can be regenerated by washing.

Description

Electrostatic Force Regenerative Filter

This application claims the benefit of the filing date of Patent Application No. 10-2020-0032485 filed with the Korean Intellectual Property Office on March 17, 2020 and Patent Application No. 10-2020-0085274 filed with the Korean Intellectual Property Office on July 10, 2020, , some or all of the contents of which are incorporated herein by reference.

The present application relates to a filter in which electrostatic force is regenerated by frictional electrification. More specifically, it relates to a filter in which a filler inside the filter continuously generates friction due to air flow or vibration inside and outside the filter, and thus can be regenerated by washing.

Due to the indiscriminate industrial development of modern society, a large amount of various harmful substances such as fine dust and yellow dust are generated, and the number of respiratory diseases is rapidly increasing. In addition, recently, due to the spread of severe acute respiratory syndrome (SARS-CoV), Middle East respiratory syndrome (MERS-CoV), or coronavirus infection (COVID-19), filters with excellent dustproof efficiency and excellent performance, or masks related to them, The demand for goods is growing.

However, conventional filters or related articles are almost impossible to recycle by washing, and have limitations in that they must be replaced at regular intervals or used once.

In addition, amid concerns about the daily life of masks and anti-dust products, the price of filter members, masks, and medical products skyrocketed due to the surge in demand for filters and related products worldwide due to the rapid spread of the virus, causing disposable filter-related items to become households. is a financial burden.

In order to improve the conventional limitations as described above, an object of the present application is to provide a filter in which electrostatic power is regenerated by frictional electrification.

One aspect of the present application relates to a filter element.

In one example, a first fiber portion; a second fiber section positioned to face the first fiber section; and a filter member positioned between the first fiber unit and the second fiber unit and including a plurality of fillers.

In one example, at least one of the first fiber part and the second fiber part is a group consisting of polyethylene, polystyrene, polypropylene, polyester, polyamide, meltblown, and wool ranging in thickness from 0.1 to 1.0 denier. It may include one or more nonwoven fabrics selected from among.

In one example, the first fiber portion or the second fiber portion may include a thermally color changing pigment.

In one example, the thermochromic pigment may be in the form of microcapsules or slurries.

In one example, the first fiber unit or the second fiber unit may include a piezoelectric fiber.

In one example, the first fiber unit, the second fiber unit or the filter media unit may include a piezoelectric element and a power supply unit.

In one example, the average diameter of the filler may range from 2 μm to 2,000 μm.

In one example, the filter media may include at least one selected from the group consisting of Teflon, silicone, vinyl chloride, polyethylene, and polypropylene.

In one example, the filler may include at least one selected from the group consisting of acetate, glass, nylon, aluminum, and polyester.

In one example, edges of the first fiber section and the second fiber section may be attached to each other.

In one example, an adhesive member may be attached to an edge of an outer surface of the first fiber unit.

In one example, the first fiber part or the second fiber part may include a metal coating part including at least one of the group consisting of a metal, a metal alloy, a metal oxide, and a porous structure formed therefrom.

Another aspect of the present application relates to an article comprising a filter element.

In one example, an article comprising a filter element according to the above is provided.

According to an embodiment of the present application, by providing electrostatic force again to a filter medium that has lost electrostatic force due to washing through triboelectric charging, there is an advantage in that the efficiency of removing fine particles can be constantly maintained and recycled.

1 is a view showing a mask including a filter member according to an embodiment of the present application.
FIG. 2 is a projection view illustrating a filter element inside a filter member included in a mask according to an exemplary embodiment of the present application.
3 is a cross-sectional view of a filter member included in a mask according to an embodiment of the present application.
4 is an electrification sequence of a material capable of maximizing triboelectric electrification according to an embodiment of the present application.
5 is a view showing the inside of a filter member included in a mask according to an embodiment of the present application.
6 is a cross-sectional view showing a metal coating portion coated on a second fiber portion of a filter member according to an embodiment of the present application.
7 is a schematic diagram for explaining an experimental example according to an embodiment of the present application.
8 is a graph showing antiviral efficiency in experimental examples using examples according to an embodiment of the present application.
9 to 11 are graphs showing the number of times DNA (or RNA) of a sample is amplified to a detection level in Example PCR according to an embodiment of the present application. 12 and 13 are images showing the temperature difference between the inner surface and the outer surface of the mask.
14 is breakthrough curves for VOC absorption of ACF samples coated with four types of Cu.
15 is a graph showing the shielding effect of Cu/polymer according to Pd aerosol and Sn-Pd activation.

Since this application can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present application to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present application. In describing the present application, if it is determined that a detailed description of related known technologies may obscure the gist of the present application, the detailed description will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present application. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Therefore, since the configurations shown in the embodiments described in this specification are only one of the most preferred embodiments of the present application and do not represent all of the technical ideas of the present application, various equivalents that can replace them at the time of the present application and variations may exist.

In addition, it should be understood that the accompanying drawings in this application are enlarged or reduced for convenience of description.

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

In one embodiment, the present application includes a first fiber portion 11; a second fiber portion 12 positioned to face the first fiber portion 11; and a filter member 14 positioned between the first fiber unit 11 and the second fiber unit 12 and including a plurality of fillers 15 .

1 is a view showing a mask including a filter member 10 according to an embodiment of the present application. However, the present application is not limited to the mask shown in the drawing, which is expressed in the shape of a mask for convenience of explanation, and can be applied to various articles as described later.

Referring to FIG. 1, the filter member 10 of the present application has a first fiber portion 11 and a second fiber portion 12 spaced apart from each other according to the purpose of use, but the inner side is concave with edges attached to each other. can be formed In addition, it may be partially attached to the center of the first fiber portion 11 and the second fiber portion 12 other than the edges.

In one example, when the filter member 10 of the present application is made into a mask or dustproof clothing, the first fiber part 11 is a part in contact with the respiratory tract and the body, and the second fiber part 12 is the outside air. It may be a part in contact with

In one example, when the filter member 10 of the present application is manufactured into a device such as an air purifier, the first fiber part 11 is a part in contact with the inside of the device, and the second fiber part 12 is a part contacting the outside air. It may be a contact part.

In addition, at least one of the first fiber part 11 and the second fiber part 12 is polyethylene, polystyrene, polypropylene, polyester, polyamide, meltblown, and It may include one or more nonwoven fabrics selected from the group consisting of wool.

If the thickness of the fibers constituting the fiber portion 13 is less than 0.1 denier, the entanglement between the fibers constituting the fiber portion 13 is not sufficient, resulting in frequent breakage and lack of durability, resulting in deterioration in the quality of the fiber portion 13. there is.

On the other hand, if the thickness of the fibers constituting the fiber part 13 exceeds 1.0 denier, the voids between the fibers are reduced, making it difficult to collect and filter dust, and the specific surface area of the fibers may be reduced.

Accordingly, the fibers constituting the fiber unit 13 may have a thickness ranging from 0.1 to 1.0 denier. More specifically, it may range from 0.2 to 1.0 denier, from 0.3 to 1.0 denier, from 0.4 to 1.0 denier, from 0.5 to 1.0 denier, from 0.6 to 1.0 denier, from 0.7 to 1.0 denier, from 0.8 to 1.0 denier, or from 0.9 to 1.0 denier.

In addition, the fiber part 13 is composed of three layers by attaching a support layer to the front and rear surfaces of the melt-blown nonwoven fabric, or consists of two layers by attaching a support layer to the front or rear surface of the nonwoven fabric. A configured HEPA filter can be used.

Melt-blown nonwoven fabric is a polymer that can form thermoplastic fibers such as PP (poly propylene), which is spun through a spinneret formed with hundreds of small orifices, and the polymer extruded from the spinning nozzle is melted. In the state, it means a self-bonding type nonwoven fabric manufactured by a manufacturing method in which ultrafine fibers are laminated on a collection body by hot air sprayed at high speed from both sides of the spinneret.

This meltblown nonwoven fabric exhibits excellent properties as a medium/high performance filter. Medium and high performance filters refer to filters corresponding to MERV 7 to 16 levels of the US air filter standard ANSI/ASHRAE 52.2 (1999). Depending on the grade, particles with an average size of 0.4 ~ 0.6㎛ can be blocked. The higher the MERV value, the better the filter efficiency and the higher grade filter.

The unit area weight of the nonwoven fabric is preferably 10 g/m 2 or more, and more preferably 60 g/m 2 or more, from the viewpoint of the reinforcing effect of the nonwoven fabric or molding processability. On the other hand, from the viewpoint of cost or molding processability, 1,000 g/m 2 or less is preferable, and 400 g/m 2 or less is more preferable.

The porosity of the nonwoven fabric is preferably 65% or more, more preferably 70% or more, from the viewpoint of pressure loss. On the other hand, from the viewpoint of the collection efficiency and rigidity of the nonwoven fabric, 90% or less is preferable, and 85% or less is more preferable. In addition, the porosity of the nonwoven fabric can be obtained from the following [Equation 1] by taking the density of the fiber itself used in the nonwoven fabric as a, the weight per unit area of the nonwoven fabric as b, and the thickness of the nonwoven fabric as c.

[Equation 1]

Porosity (%) =

The thickness of the nonwoven fabric is not particularly limited, but is preferably 200 to 2,000 μm, more specifically 200 to 1,900 μm, 200 to 1,800 μm, 200 to 1,700 μm, and 200 to 1,600 μm, from the viewpoint of stiffness and pressure loss of the nonwoven fabric. , 200 to 1,500 μm, 220 to 2,000 μm, 220 to 1,800 μm, 220 to 1,600 μm, 240 to 2,000 μm, 240 to 1,800 μm, 250 to 2,000 μm, 250 to 1,800 μm, or 250 to 1,500 μm. can

Meanwhile, the HEPA (High Efficiency Particulate Air, HEPA) filter is an air filter that removes dust in the air and has a collection capacity of 85 to 99.975% or more for particles of 0.3 μm depending on the grade, and the filter paper mainly has a diameter of 1 to 10. It is made of glass fibers of less than ㎛. Therefore, it may be additionally included when manufacturing articles such as air purifiers, air conditioners, and vacuum cleaners using the filter member according to the present application.

On the other hand, the fiber part 13 in this application is not limited to the material according to the above, and any material that can form the fiber part 13 may be applied.

In addition, the first fiber part 11 or the second fiber part 12 may include a thermochromic color change pigment that is a reversible temperature color change pigment.

Thermochromic pigments are pigments that change color as the molecular structure changes depending on the temperature. The molecular structure of the molecules that make up the thermochromic pigment reacts to the ambient temperature, and when the molecular structure changes, the distribution of electrons surrounding the molecule changes. Therefore, since the molecule absorbs light of a specific color according to the distribution of electrons, the molecular structure change appears as discoloration.

The thermochromic color changing pigment has no odor and is harmless to the human body, and is suitable for manufacturing a mask or medical dustproof article including the filter member 10 according to the present application. At this time, since the thermochromic color changeable pigment has no affinity for fibers because it does not have a hydrophilic group or a lipophilic group in a molecule, a thermochromic dye made of a water-soluble thermochromic colorant can be used when fabricating the fiber part 13 .

The thermochromic color-changing pigment may be separately formed to change color to different colors at 35° C., 36° C., 37° C., 38° C., 39° C., or 40° C. or more. More specifically, the color of the thermochromic color change pigment that reacts at 35 ° C or higher, 36 ° C or higher, 37 ° C or higher, 38 ° C or higher, 39 ° C or higher, or 40 ° C or higher is changed to, for example, red, orange, yellow, etc. It can be discolored in different colors according to the user's body temperature.

Therefore, when the filter member 10 according to the present application is made of an article in contact with the body, such as a mask or medical dustproof clothing, it is possible to more easily check whether or not fever is caused by infection in real time. In one example, based on adults, the first thermally discoloring pigment in the normal body temperature range of 35.9 ° C to 37.6 ° C, the second thermally discoloring pigment in the mild fever range of 37.5 ° C to 38 ° C, and the high temperature range of 38 ° C or higher Exothermic heat can be confirmed by using the third thermochromic color change pigment.

In addition, the thermochromic color change pigment may be characterized in that it is in the form of microcapsules or slurry. In particular, the microcapsule form has an excellent ability to adhere to the fiber part 13, and the effect of not losing the discoloration function even after washing the clothes is excellent.

In addition, in one example, the discolored portion of the mask on which the filter member 10 is mounted that is discolored by the thermochromic pigment may be partially discolored, such as a nose, cheek, or chin area, or may be entirely discolored.

Meanwhile, the first fiber unit 11 or the second fiber unit 12 may include a piezoelectric fiber.

Piezoelectric fibers can convert pressure or vibration into electrical energy, and have excellent flexibility and elasticity, so they can be applied to various types of wearable electronic devices and clothing. That is, the piezoelectric material uses the fact that an electric field is formed by an electric dipole phenomenon in which a positive charge and a negative charge are misaligned as the material is deformed by an external force or a vertical and horizontal vibration caused by a user's movement.

Therefore, in the filter member 10 according to the present application including the piezoelectric fiber, electrostatic force is generated by friction between the fiber portion 13 or the filter media portion 14 in which the electric field is formed as described above and the filler 15 to be described later. Occurs. Such frictional electrification can provide electrostatic power again to the filter media that has lost electrostatic power due to washing. Reduced electrostatic power can be reproduced by vibration after wearing.

At this time, the diameter of the piezoelectric fiber may be in the range of 100 to 500 μm. More specifically, 100 to 450 μm, 100 to 400 μm, 100 to 350 μm, 100 to 300 μm, 100 to 200 μm, 150 to 400 μm, 150 to 300 μm, 150 to 200 μm, 200 to 500 μm, 200 μm to 400 μm, 300 to 500 μm, or 300 to 400 μm. If the diameter of the piezoelectric fiber exceeds 500 μm, it is not suitable because the thickness may be too thick and the shape may be restricted when applied to fabrics or devices.

In addition, a piezoelectric element other than a piezoelectric fiber may be included in the first fiber unit 11, the second fiber unit 12, or the filter medium unit 14 together with the power supply unit. At this time, the power supply unit may collect and supply the triboelectric energy generated by the piezoelectric element or may supply it by attaching a small-sized solar panel. In addition, when the article including the filter member 10 is in contact with the body, the power supply may be charged with body temperature by placing the thermoelectric element on the skin contact area.

FIG. 2 is a projection view showing a filter element inside a filter member included in a mask according to an embodiment of the present application, and FIG. 3 is a cross-sectional view of a filter member included in a mask according to an embodiment of the present application.

Referring to FIGS. 2 and 3 , in the filter member 10 according to the present application, a filter medium 14 having a net structure is formed between the first fiber part 11 and the second fiber part 12 . In addition, a filler 15 is filled in the filter member 14 .

Here, the filtering member 14 has a lattice structure, net structure, or chain structure, and the diameter of the filler 15 filled in the filtering member 14 is greater than the average diameter of the pores of the filtering member 14, or can be small

The structure of the filter element 14 serves as a passage when outside air is introduced, allowing the filler 15 to vibrate within the filter element 14 . In one example, when the filter member 10 according to the present application is manufactured as a mask, the filler 15 floats, vibrates, and rubs against the filter element 14 due to inhalation and exhalation of the user during breathing. can

At this time, the average diameter of the filler 15 may be in the range of 2 μm to 2,000 μm. More specifically, 2 μm to 1,800 μm, 2 μm to 1,600 μm, 2 μm to 1,400 μm, 2 μm to 1,200 μm, 2 μm to 1,000 μm, 400 μm to 2,000 μm, 600 μm to 2,000 μm, 800 μm to 2,000 μm μm, 1,000 μm to 2,000 μm, 1,500 μm to 2,000 μm, 200 μm to 500 μm, 500 μm to 1,000 μm, or 1,000 μm to 1,500 μm. When the diameter of the filler 15 is smaller than 2 μm or larger than 2,000 μm, the electrostatic power regeneration efficiency due to friction may decrease. In addition, by reducing the diameter of the filler 15 or increasing the number of fillers 15 filled in the filter element 14, the removal efficiency of fine dust, dust, or viruses may be improved.

In addition, the filler 15 is preferably a bead-shaped spherule, but is not limited thereto. In addition, the fillers 15 included in the filtering member 14 may have the same size or may have various sizes mixed.

4 is an electrification sequence of a material capable of maximizing triboelectric electrification according to an embodiment of the present application.

In the charging sequence of FIG. 4, when materials are contacted or rubbed, materials that are easily charged to (+) are placed on top, and materials that are easily charged to (-) are placed in a row in that order.

In one example, when glass and iron are rubbed, glass is charged (+) and iron is charged (-), and when iron and Teflon are rubbed, iron is charged (+) and Teflon is charged (-). In this way, the charge polarity changes according to the material of the opponent, and when the upper material and the lower material rub against each other in the charging sequence, the upper material is charged (+) and the lower material is charged (-). Further, friction between substances having a close positional relationship in the charge sequence has a relatively small charge amount, and friction between substances having a distant positional relationship has a large charge amount.

Accordingly, referring to FIG. 4 , the filter media unit 14 includes at least one selected from the group consisting of Teflon, silicone, vinyl chloride, polyethylene, and polypropylene, and the filler 15 includes acetate, glass, nylon, aluminum, and It may include at least one selected from the group consisting of polyester.

Conversely, the filter element 14 includes at least one selected from the group consisting of acetate, glass, nylon, aluminum, and polyester, and the filler 15 is selected from the group consisting of Teflon, silicone, vinyl chloride, polyethylene, and polypropylene. At least one selected may be included. However, other than the above-mentioned materials, any material capable of causing frictional electrification may be used.

More specifically, in order to maximize frictional electrification, various combinations of materials of the electrostatic filtering medium of the filtering element 14 and the material of the filler 15 may be selected and utilized. In one example, the electrostatic filtering material of the filtering member 14 may be made of silicon and nylon as beads. In another example, glass may be formed of silicon or beads as an electrostatic filtering medium of the filtering member 14 . In another example, the electrostatic filtering medium of the filtering element 14 may be made of nylon and beads, and the combination is variable depending on the type of article and suitable material for which the filter member of the present application is used, as shown in FIG. It is not limited to the substances shown in the charge sequence. In addition, in order to obtain high electric power with little friction, it is preferable to combine materials with a far positional relationship in the electrification sequence.

Accordingly, the filter member 10 according to an embodiment of the present application can provide electrostatic power again to a filter medium that has lost electrostatic power even by washing through a structure capable of forming triboelectric charge.

On the other hand, it may be a filter member 10 in which an adhesive member is attached to the edge of the outer surface of the first fiber unit.

5 is a view showing the inside of a filter member included in a mask according to an embodiment of the present application.

Referring to FIG. 5 , the adhesive member 16 including a close-fitting fabric or an adhesive gel pad is attached to the edge of the surface of the first fiber portion 11 in contact with the user's skin, so that airtightness between the skin can be secured. In addition, the adhesive member 16 is attached to the inside of the earring part of the mask to reduce pain and fatigue applied to the ear when worn for a long time. On the other hand, the adhesive cloth or adhesive gel pad may be an adhesive material. In particular, the adhesive gel pad may be made of a thin silicon material, thereby reducing irritation to the skin when attaching and detaching, and regenerating adhesiveness by washing.

In addition, the first fiber part 11 or the second fiber part 12 may include a metal coating part including a metal having high thermal conductivity. Here, the metal may include a pure metal, an alloy of these metals, an oxide of these metals, or a porous structure formed therefrom. Examples of metals include silver, copper, gold, aluminum, iron, and the like.

6 is a cross-sectional view showing a metal coating portion coated on a second fiber portion of a filter member according to an embodiment of the present application.

3 and 6, in the filter member 10 in which the metal coating part 17 is coated on the second fiber part 12, the metal fiber yarn 18 uses the second fiber part 12 as a support layer. It may be formed of a metal coating portion 17 intersecting with warp and weft yarns. For example, the warp and weft yarns may be formed by aggregating or twisting a plurality of metal fiber yarns 18, respectively.

The mask using the filter member 10 including the second fiber portion 12 coated with the metal coating portion 17 releases body heat and heat inside the mask caused by long-time wear to the outside at a lower temperature than the mask. . Due to this, it is possible to prevent the inside of the mask in close contact with the skin from being filled with sweat, and it is possible to have a more comfortable wearing feeling.

In addition, the mask in which the metal coating portion 17 is coated on the second fiber portion 12 can be dried and simply sterilized by resistive heating when power is applied.

Meanwhile, in one embodiment, the present application provides an article including the filter member 10 described above.

The article may be applied as a mask, protective clothing, dustproof clothing, air purifier, or other medical or industrial equipment. In one example, when manufacturing a mask including the filter member 10 according to the present application, the fixing wire may be made of a shape memory alloy, and explanations obvious to those skilled in the art, such as earring straps, will be omitted.

The present application will be described in more detail through experimental examples below.

[Experimental Example 1]

Mask Example 1 was manufactured by inserting a polypropylene filter medium filled with acetate between the facing first fiber part and the second fiber part, and attaching a copper coating part to one surface of the second fiber part.

As can be seen in the schematic diagram of the experimental example shown in FIG. 7, conditions similar to those when the actual mask is used on the surface of the mask of Example 1 (a form in which virus particles are suspended in the air at room temperature and normal pressure and attached to the mask) ), the antiviral efficiency of two corona viruses and one influenza virus captured for 30 minutes was measured, and shown in FIG. 8.

The antiviral efficiency represents the efficiency of the copper-coated mask when the effect of the uncoated mask is set as '0'. Therefore, the virus survival rate (survival rate: 100%) was high in the case of the uncoated mask, and the virus survival rate (survival rate: up to 17%) was significantly lowered in the case of the copper-coated mask.

As shown in FIG. 8, all of HCoV OC43, HCoV 229E and H1N1 exhibited excellent killing rates.

[Experimental Example 2]

Mask Example 2 was manufactured by inserting a polypropylene filter medium filled with acetate between the facing first and second fiber parts. In addition, mask Example 3 was prepared by inserting an acetate-filled polypropylene filter medium between the facing first fiber part and the second fiber part, and attaching a copper coating part to one side of the second fiber part.

Cycle numbers were measured for Examples 2 and 3 and shown in FIGS. 9 to 11.

The cycle number is the number of times the DNA (or RNA) of the sample is amplified from PCR to the detection level, and the smaller the number, the higher the viability of the virus.

As shown in FIGS. 9 to 11 , the viability of the virus was high in the uncoated mask, and the viability of the virus was significantly lower in the copper-coated mask than in the uncoated mask.

[Experimental Example 3]

Mask Example 4 was manufactured by inserting a glass filter medium filled with silicon between the facing first and second fiber parts. In addition, mask Example 5 was manufactured by inserting a glass filter medium filled with silicon between the facing first fiber part and the second fiber part, and attaching a copper coating part to one surface of the second fiber part.

For Examples 4 and 5, the temperature was measured during exhalation and inhalation, and the thermal image was shown in FIG. 12, and the temperature difference between the inner surface and the outer surface of the mask was measured and shown in FIG. The smaller the temperature difference is, the higher the heat dissipation performance is.

As shown in FIG. 13, the temperature difference of the uncoated mask was not large, but the temperature difference of the copper-coated mask was smaller, indicating that the heat dissipation performance was excellent.

[Experimental Example 4]

In order to confirm the ability of copper particles to absorb volatile organic compounds (VOCs), samples were prepared by applying copper particles to activated carbon fibers. Specifically, the inlet concentration of VOC was maintained at 1 ppmv. The mass and face velocity of each sample were 750 ± 50 mg (pristine ACFs) and 0.5 m/s.

14 shows breakthrough curves for VOC absorption of ACF samples coated with four types of copper. As shown in FIG. 14, it was confirmed that all four types of breakthrough were almost 0 for 70 minutes, and ended at 250 minutes after rapidly rising after 80 minutes. It was confirmed that the tailing effect becomes more important as the copper deposition time increases due to the clogging of micropores by copper particles in ACF.

[Experimental Example 5]

In order to confirm the shielding effect of the copper particles, the following experiment was performed.

15 is a graph showing the shielding effectiveness of Cu/polymer samples by Pd aerosol and Sn-Pd activation. As shown in FIG. 15, the shielding effect of Cu/polymer samples maintained a similar level in the frequency range of 2-18 GHz. At about 4–10 dB, the activated samples with Pd aerosol nanoparticles showed a higher range of shielding effectiveness compared to the Sn-Pd activated samples.

The loss of efficiency of the deposition due to Sn-Pd activation may have occurred due to the relatively low purity (corresponding conductivity), resulting in a significant reduction in efficiency. When Sn-Pd activation was performed, impurities such as Sn (2.8–1.6 mass%) and Cl (0.7–0.2% of total number of atoms) compounds remained. Moreover, morphological differences in deposition of different activations also contributed to the discrepancy. Longer Cu particle chains were dispersed on the substrate due to Pd aerosol activation, which can be attributed to the percoalation phenomenon. Nevertheless, there was no significant difference in the effect between activations with increasing ELD time. A relatively small difference in composition ratio between surface activation and Cu deposition was found to cause a reduction in the difference.

The content of the present application has been described with reference to the embodiments shown in the drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present application should be determined by the technical spirit of the appended claims.

10: filter member
11: first fiber section
12: second fiber section
13: fiber part
14: Women's Ministry
15: filler
16: adhesive member
17: metal coating part
18: metal fiber yarn

Claims (13)

a first fiber section;
a second fiber section positioned to face the first fiber section; and
It is located between the first fiber part and the second fiber part and includes a filter medium containing a plurality of fillers,
The filler is a bead-shaped spherule, the average diameter of the filler is in the range of 2 μm to 2,000 μm, and the filter member has a lattice structure, a net structure or a chain structure.
According to claim 1,
At least one of the first fiber part and the second fiber part is at least one selected from the group consisting of polyethylene, polystyrene, polypropylene, polyester, polyamide, meltblown, and wool in the range of 0.1 to 1.0 denier in thickness A filter member comprising a non-woven fabric.
According to claim 1,
The filter member of claim 1 , wherein the first fiber portion or the second fiber portion includes a thermally color changing pigment.
According to claim 3,
A filter element in which the thermochromic pigment is in the form of microcapsules or slurry.
According to claim 1,
The filter member according to claim 1 , wherein the first fiber portion or the second fiber portion includes piezoelectric fibers.
According to claim 1,
The first fiber part, the second fiber part, or the filter member includes a piezoelectric element and a power supply part.
delete According to claim 1,
A filter member comprising at least one selected from the group consisting of teflon, silicone, vinyl chloride, polyethylene and polypropylene.
According to claim 1,
A filter member comprising at least one filler selected from the group consisting of acetate, glass, nylon, aluminum, and polyester.
According to claim 1,
Edges of the first fiber section and the second fiber section are attached to each other.
According to claim 1,
A filter member having an adhesive member attached to an edge of an outer surface of the first fiber portion.
According to claim 1,
The first fiber part or the second fiber part includes a metal coating part including at least one of the group consisting of metal, metal alloy, metal oxide, and a porous structure formed therefrom.
An article comprising a filter element according to any one of claims 1 to 6 and 8 to 12.

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