KR20230152359A - Method for prefilter comprising silver ion having excellent antibacterial effect - Google Patents

Abstract

The present invention relates to a method of manufacturing an antibacterial prefilter containing silver ions. In one embodiment, the pre-filter manufacturing method includes applying a silver ion colloidal solution to the surface of a filter substrate; and drying the applied silver ion colloidal solution at 80°C or lower.

Description

Method for manufacturing an antibacterial prefilter containing silver ions {METHOD FOR PREFILTER COMPRISING SILVER ION HAVING EXCELLENT ANTIBACTERIAL EFFECT}

The present invention relates to a method of manufacturing an antibacterial prefilter containing silver ions.

Recently, harmful ultraviolet rays, pests, and fine dust have been generated due to environmental pollution, global warming, and ozone layer destruction, causing inconvenience to human life.

Among these, fine dust is classified as a Group 1 carcinogen, which has been confirmed to cause cancer in humans by the International Agency for Research on Cancer (IARC) under the World Health Organization (WHO). Recently, damage caused by the COVID-19 virus has become a major issue around the world, and functional textile materials (including nanofibers) and air purification devices that can block or remove harmful factors such as fine dust, bacteria, mold, and viruses are being developed. Demand is increasing.

Meanwhile, in air conditioners, air purifiers, and air conditioners (air conditioners), indoor/outdoor air circulation devices suck indoor/outdoor air into the device and then pass through multiple filters to provide purified air back to the outside of the device.

Air purifiers and air conditioners are equipped with multiple filters. Figure 1 below shows multiple filters that make up an air purifier. Referring to FIG. 1, the air purifier is sequentially equipped with a pre-filter (1), a medium filter (2), and a HEPA filter (3). The pre-filter (1) is a filter that filters relatively large dust with a particle size of about 50㎛ or more and is mainly used as a pre-filter (primary filter) in air purifiers or air conditioners. The medium filter (2) filters fine dust with a particle size of approximately 1㎛ or more through the inflow of air filtered from the pre-filter, and the HEPA filter (3) (high efficiency particulate air filter, HEPA filter) filters fine dust of 0.3㎛ or less. It serves to filter dust.

Meanwhile, pre-filters are manufactured using insert injection molding and wire frames. The material of the pre-filter is made of polypropylene (PP) and polyethylene (PE), and a general operating temperature of 60℃ or less and a wind speed of 2.5m/sec are recommended.

In the case of some functional air purification products, a functional filter made of needle-punched or non-woven fabric is placed additionally between the pre-filter and medium (deodorizing) filter to increase the antibacterial or deodorizing effect. Additionally, some functional products use UV lighting or plasma light sources using a separate power source after the HEPA filter to add antibacterial properties.

In addition, the pre-filter and functional filter may be integrated into one piece, or a separate power source may be applied to the rear end of the pre-filter to use a UV light or plasma light source filter that realizes antibacterial power. In this way, the air inhaled through the air circulation device may be used. In order to realize antibacterial activity, the product and technology are being implemented by using a separate power module or implementing a separate additional filter product group. However, when adding an additional functional filter like this, there was a problem that the wind speed discharged from the air circulation device decreased, resulting in a decrease in performance.

Conventionally, prefilters were manufactured through a process of mixing antibacterial substances such as copper (Cu) ions and titanium dioxide (TiO ₂ ) with raw materials during the injection process of yarn and fabric, or spraying them together during the injection process of fabric. However, the prefilter manufactured in this way has a low adhesion between the fiber and the antibacterial material, so the durability of the antibacterial effect is low, and it is difficult for the antibacterial material to be uniformly dispersed on the surface of the fiber, resulting in a decrease in antibacterial efficiency.

In addition, the process cost increases during the process of mixing antibacterial substances into prefilter yarn and spinning at high temperatures, and the antibacterial substances block the pores formed in the filter, causing a decrease in air velocity discharged through the discharge port of the air purification product, which reduces performance. there was.

In particular, when spraying conventional antibacterial substances by adding a separate airline, additional detailed adjustments such as nozzle settings and spray amount according to the particle size of the antibacterial substances are required, and when sprayed on the surface of the fabric, it also penetrates into the fabric, reducing the overall distribution of antibacterial substances. Because the surface area or quantity in contact with bacteria may be reduced, research to improve this is required.

Background technology related to the present invention is disclosed in Republic of Korea Patent Publication No. 2021-0082287 (published on July 5, 2021, title of the invention: Odor removal unit for semiconductor manufacturing clean room and method of manufacturing the same).

One object of the present invention is to provide a method for manufacturing an antibacterial prefilter with excellent antibacterial, antiviral and long-term performance.

Another object of the present invention is to provide a method for manufacturing an antibacterial prefilter that has excellent dispersibility of silver ions on the surface of the filter fiber and excellent adhesion and durability between silver ions and the filter fabric.

Another object of the present invention is to provide a method of manufacturing an antibacterial prefilter that is easy to clean and prevents a decrease in the wind speed of air passing through the filter fabric.

Another object of the present invention is to provide a method for manufacturing an antibacterial prefilter with excellent productivity and economic efficiency.

One aspect of the present invention relates to a method for manufacturing an antibacterial prefilter containing silver ions. In one embodiment, the pre-filter manufacturing method includes applying a silver ion colloidal solution to the surface of a filter substrate; and drying the applied silver ion colloidal solution at 80°C or lower.

In one embodiment, the application may be performed by spraying the silver ion colloidal solution at a pressure of 0.1 to 0.5 mp using a spray gun with a nozzle diameter of 0.3 to 1.0 mm.

In one embodiment, the silver ion colloidal solution may be prepared by placing a silver (Ag) electrode in an aqueous electrolyte solution containing a dispersant and water and electrolyzing it.

In one embodiment, the silver ion colloidal solution has a pH of 5.5 to 6.5 and a specific gravity of 1.0 to 1.1, and may include 0.01 to 0.1% by weight of silver ions and 99.9 to 99.99% by weight of water.

In one embodiment, the silver ions may have an average size of 1 to 100 nm.

In one embodiment, the drying is performed by spraying the silver ion colloidal solution on the surface of the filter substrate 1 to 3 times and drying at 30 to 70° C., and drying at a pressure of 0.001 to 0.9 bar to shorten the drying time and achieve a deposition effect. Can be dried under reduced pressure.

In one embodiment, the filter substrate includes one or more of fabric, mesh, and non-woven fabric, and the filter substrate may include one or more of polypropylene (PP), polyethylene (PE), and polyester.

When applying the antibacterial prefilter manufacturing method according to the present invention, antibacterial, antiviral and long-term performance are excellent, the dispersion of silver ions on the surface of the filter fiber is excellent, and the adhesion and durability between silver ions and the filter fabric are excellent. It is easy to clean, does not deteriorate in antibacterial properties even after washing with water, prevents a decrease in the wind speed of air passing through the filter fabric, and can provide excellent productivity and economic efficiency.

Figure 1 shows multiple filters that make up an air purifier.
Figure 2 is a schematic diagram showing an antibacterial material formed on the surface of a conventional prefilter.
Figure 3 is a schematic diagram showing the antibacterial material formed on the surface of the prefilter of the present invention.
Figure 4 is a test report showing the antibacterial activity evaluation results of Examples 1 to 5.
Figure 5 is a test report showing the antibacterial activity evaluation results of Examples 1 to 5.
Figure 6 is a test report showing the antibacterial activity evaluation results of Examples 1 to 5.
Figure 7 is a test report showing the antibacterial activity evaluation results of Examples 6 to 10.
Figure 8 is a test report showing the antibacterial activity evaluation results of Examples 6 to 10.
Figure 9 is a test report showing the antibacterial activity evaluation results of Examples 6 to 10.
Figure 10 is a test report showing the results of antibacterial substance removal evaluation in Examples 1 to 10.
Figure 11 is a test report showing the results of antibacterial substance removal evaluation in Examples 1 to 10.
Figure 12 is a test report showing the results of antibacterial substance removal evaluation in Examples 1 to 10.
Figure 13(a) is a schematic diagram showing the wind speed measurement evaluation method of the example pre-filter, and Figure 13(b) is a photograph showing the wind speed measurement evaluation of the example pre-filter.
Figure 14 is a reliability test certificate related to wind speed measurement evaluation of Examples 1 to 10.

In describing the present invention, if it is determined that a detailed description of related known technology or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator, so the definitions should be made based on the content throughout the specification explaining the present invention.

Method of manufacturing an antibacterial prefilter containing silver ions

One aspect of the present invention relates to a method for manufacturing an antibacterial prefilter containing silver ions. In one embodiment, the pre-filter manufacturing method includes (S10) applying a silver ion colloidal solution to the surface of a filter substrate; and (S20) drying the applied silver ion colloidal solution at 70°C or lower.

Hereinafter, the method for manufacturing an antibacterial prefilter containing silver ions of the present invention will be described in detail step by step.

(S10) Silver ion colloid solution application step

The above step is a step of applying a silver ion colloidal solution to the surface of the filter substrate.

In one embodiment, the filter material may include one or more of polypropylene (PP), polyethylene (PE), and polyester.

In one embodiment, the filter substrate includes fibers having a fiber diameter of 0.5 to 10 μm, and the fibers may include one or more of polypropylene (PP), polyethylene (PE), and polyester. The polyester may include one or more of polyethylene terephthalate and polybutylene terephthalate.

In one embodiment, the filter substrate may include one or more of fabric, mesh, and non-woven fabric.

In one embodiment, the nonwoven fabric is spun bond, flash spun, melt-blown, electro-spinning, wet-laid, or air-laid. It can be manufactured using one or more of the following methods: laid, needle-punching, and spunlace.

For example, the filter substrate is multi-card process, multi forming box air-lay and wet-lay process, combined forming process, hydroknit multi. It can be manufactured using the hydroknit multi-bonding process, integrated woven-nonwoven process, vapor web process, or napco process.

In one embodiment, the application may be performed by spraying the silver ion colloidal solution at a pressure of 0.1 to 0.5 MPa using a spray gun with a nozzle diameter of 0.3 to 1.0 mm. When the spray gun and pressure conditions above are applied, workability is excellent and silver ions can be uniformly dispersed on the surface and inside the filter substrate. In one embodiment, the application may be repeated 1 to 3 times.

On the other hand, a colloid solution is a state in which a substance becomes particles of a specific size (about 0.1㎛) and is dispersed in other substances. Colloids often include membranes (two-dimensional colloids) or fibers (one-dimensional colloids) with a thickness or thickness of 1 to 10 nm. When the molecule itself becomes nanometer-sized, a solution of such a substance exhibits the properties of a colloid, although it is a molecular solution. In other words, it is a colloidal dispersion system. Solutions of starch, protein, and polymer substances are like this, and they are collectively called molecular colloids or true colloids. A liquid in which colloidal particles are dispersed is called a colloidal solution. The material of the dispersed particles is called a dispersoid (disperse phase), and the medium of dispersion is called a dispersion medium.

The present invention applies a silver ion colloidal solution to deposit a silver ion-based antibacterial material on the surface of the prefilter fabric at a certain level of temperature and pressure conditions to maintain the antibacterial effect by consistently depositing the antibacterial material on the surface of the fabric.

The silver ion colloidal solution may include silver ions (Ag+). When the silver ion is included, antibacterial activity may be excellent. For example, the silver ion colloidal solution may further include silver particles.

In one embodiment, the silver ion colloidal solution may be prepared by placing a silver (Ag) electrode in an electrolytic aqueous solution containing a dispersant and water and electrolyzing it.

In one embodiment, electrolysis can be performed by immersing two silver (Ag) electrodes facing each other in a mixed solution containing a dispersant and water and applying direct current or alternating current power.

In one embodiment, the electrolytic aqueous solution may further include a reducing agent. For example, the electrolytic aqueous solution can be prepared by dissolving a dispersant in water and then adding a reducing agent and mixing.

In one embodiment, the water may include deionized water (ultrapure water).

In one embodiment, the dispersant may include one or more of sodium dodecyl sulfate, sodium lauryl sulfate, ammonium dodecyl sulfate, sodium dodecyl benzene sulfonate, and sodium dodecyl naphthalene sulfate. When the dispersant is included, the dispersibility of the silver ion colloidal solution may be excellent. The dispersant may be included in an amount of 0.001 to 5 parts by weight based on 100 parts by weight of water.

In one embodiment, the reducing agent may include one or more of sodium citrate and potassium citrate. When the reducing agent is included, the silver ion colloidal solution can be easily prepared.

For example, the reducing agent may be included in an amount of 0.001 to 5 parts by weight based on 100 parts by weight of water. Under the above conditions, a silver ion colloidal solution can be easily prepared.

For example, electrolysis can be performed under conditions of a current of 0.5 to 1.5 A and a direct current (DC) voltage of 10 to 40 V.

In one embodiment, the electrolysis may be performed at 50 to 90°C.

In one embodiment, the silver ion colloidal solution may have a pH of 5.5 to 6.5 and a specific gravity of 1.0 to 1.1. Under the above conditions, workability is excellent and silver ions can be uniformly dispersed on the surface of the filter substrate.

In one embodiment, the silver ion colloidal solution may include 0.01 to 0.1% by weight of silver (Ag) and 99.9 to 99.99% by weight of water. Under the above conditions, silver ions are uniformly dispersed on the surface of the filter substrate, and antibacterial and antiviral properties can be excellent. For example, the silver ion colloidal solution may include 0.01 to 0.1% by weight of silver ions (Ag+) and 99.9 to 99.99% by weight of water.

In one embodiment, the silver (or silver ion) may have an average size of 1 to 100 nm. The size may mean the maximum length or particle size of the silver ion. Under the above conditions, silver ions are uniformly dispersed on the surface of the filter substrate, and antibacterial and antiviral properties can be excellent.

(S20) Drying step

This step is a step of drying the applied silver ion colloidal solution at 80°C or lower. When the silver ion colloidal solution is dried at a temperature exceeding 80°C, silver ions are not deposited on the surface of the filter substrate or the adhesion is reduced, thereby reducing durability, and silver ions are not uniformly dispersed on the surface of the filter substrate, resulting in a decrease in antibacterial properties. It can be. For example, it can be dried at 30~70℃.

In one embodiment, the drying may be performed through reduced pressure drying. For example, the reduced pressure drying may be performed at 30 to 70°C and a pressure of 0.001 to 0.9 bar. Under the above conditions, the economic efficiency and process time reduction effect are excellent when drying under reduced pressure, and the moisture in the silver ion colloid solution evaporates easily, allowing silver ions to be uniformly dispersed on the surface of the filter substrate. In one embodiment, the drying may be performed for 10 to 30 minutes. Under the above conditions, silver ions can be uniformly dispersed on the surface of the filter substrate.

For example, the present invention configures drying conditions under different temperature conditions at a temperature between 30 and 70 degrees by varying the number of sprays of the antibacterial material on the surface of the pre-filter from 1 to 3 times, and changes the drying time and deposition effect. For this purpose, drying and deposition effects can be expected by applying a pressure of 0.001 to 0.9 bar.

In one embodiment, the drying is performed by spraying the silver ion colloidal solution on the surface of the filter substrate one to three times and drying at 30 to 70°C, and the drying is performed at a pressure of 0.001 to 0.9 bar to shorten the drying time and achieve a deposition effect. Can be dried under reduced pressure.

Figure 2 is a schematic diagram showing an antibacterial material formed on the surface of a conventional prefilter. Referring to FIG. 2, the conventional pre-filter has a structure in which antibacterial substances (silver ions) 11, such as copper ions, are not uniformly dispersed on the surface and inside of the filter substrate 10, but are irregularly dispersed, thereby reducing antibacterial efficiency. There was a problem with deterioration.

Figure 3 is a schematic diagram showing the antibacterial material formed on the surface of the prefilter of the present invention. Referring to FIG. 3, in the pre-filter of the present invention, antibacterial substances (silver ions) 110 with an average size of 1 to 100 nm are uniformly dispersed on the surface of the filter substrate 100, preventing bacteria and viruses flowing into the filter substrate. The surface area of silver ions for contact with etc. can be maximized. Also, considering that the size of a typical virus is 0.1~0.5㎛, antibacterial substances smaller than this have an average size of 1~100nm at the border of nanomaterials, so there is a certain level of detachment of antibacterial substances deposited on the surface of yarn or fabric. Direct antibacterial effect can be expected by penetrating inside the virus that causes infection.

Antibacterial prefilter manufactured by an antibacterial prefilter manufacturing method containing silver ions.

Another aspect of the present invention relates to an antibacterial prefilter manufactured by the method for manufacturing an antibacterial prefilter containing silver ions. In one embodiment, the antibacterial prefilter includes a filter substrate; and silver (or silver ions) dispersed on the surface of the filter substrate.

In one embodiment, the silver may include one or more of silver (Ag) and silver ions (Ag+).

In one embodiment, the silver may have an average size of 1 to 100 nm.

In one embodiment, the filter material may include one or more of polypropylene (PP), polyethylene (PE), and polyester.

In one embodiment, the filter substrate includes fibers having a fiber diameter of 0.5 to 10 μm, and the fibers may include one or more of polypropylene (PP), polyethylene (PE), and polyester. The polyester may include one or more of polyethylene terephthalate and polybutylene terephthalate.

When applying the pre-filter manufacturing method of the present invention, antibacterial activity was achieved without using a separate power source or additional functional filter in air circulation devices, including conventional air purifiers.

The present invention can be applied to various types of air circulation devices. For example, it can be applied to air conditioners, air purifiers, or air conditioners.

The present invention can maintain antibacterial activity even if the prefilter surface is washed with water or the like.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and should not be construed as limiting the present invention in any way. Any information not described here can be technically inferred by anyone skilled in the art, so description thereof will be omitted.

Examples and Comparative Examples

Example 1

(1) Preparation of silver ion colloid solution: Place silver (Ag) electrodes in an electrolyte solution prepared by mixing water with a dispersant (sodium dodecyl sulfate) and a reducing agent (sodium citrate) and apply a direct current power of 10 to 30 V. By electrolysis, a silver ion colloidal solution with a pH of 5.5 to 6.5 and a specific gravity of 1.0 to 1.1 was prepared. The silver ion colloidal solution contained 0.015% by weight (150ppm) of silver ions (Ag+) with an average particle diameter of 0.1 to 100 nm and 99.985% by weight of water.

(2) Application of silver ion colloid solution: As a filter base for a pre-filter, a non-woven filter base using polypropylene (PP) fibers with a diameter of 0.5 to 10 ㎛ was prepared. Next, the silver ion colloid solution was sprayed on the surface of the filter substrate one to three times (using a spray gun with a nozzle diameter of 0.3 to 1.0 mm at a pressure of 0.1 to 0.5 MPa).

(3) Reduced pressure drying: The silver ion colloid solution applied to the surface of the filter substrate was put into a reduced pressure dryer and dried under reduced pressure for 10 minutes at 30°C and a pressure of 0.01 bar to prepare a pre-filter for an air purification device.

Example 2

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed once on the surface of the filter substrate and dried under reduced pressure for 10 minutes at 30°C and 0.01 bar.

Example 3

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed once on the surface of the filter substrate and dried under reduced pressure for 20 minutes at 30°C and 0.01 bar.

Example 4

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1 by spraying the silver ion colloidal solution once on the surface of the filter substrate and drying it under reduced pressure for 30 minutes at 30°C and a pressure of 0.01 bar.

Example 5

A pre-filter for an air purification device was prepared in the same manner as in Example 1, except that the process of spraying the silver ion colloidal solution on the surface of the filter substrate and drying under reduced pressure for 10 minutes at 30°C and 0.01 bar was repeated three times. Manufactured.

Example 6

A silver ion colloidal solution containing 0.025% (250ppm) by weight (250ppm) of silver ions (Ag+) and 99.975% by weight of water was sprayed on the surface of the filter substrate and dried under reduced pressure at 30°C and 0.01 bar for 10 minutes. A pre-filter for an air purification device was manufactured in the same manner as in Example 1.

Example 7

A pre-filter for an air purifying device was prepared in the same manner as in Example 6, except that the process of spraying the silver ion colloidal solution on the surface of the filter substrate and drying under reduced pressure for 10 minutes at 30°C and 0.01 bar was repeated twice. Manufactured.

Example 8

A pre-filter for an air purifying device was prepared in the same manner as in Example 6, except that the process of spraying the silver ion colloidal solution on the surface of the filter substrate and drying under reduced pressure for 20 minutes at 30°C and 0.01 bar was repeated twice. Manufactured.

Example 9

A pre-filter for an air purifying device was prepared in the same manner as in Example 6, except that the process of spraying the silver ion colloidal solution on the surface of the filter substrate and drying under reduced pressure for 30 minutes at 30°C and 0.01 bar was repeated twice. Manufactured.

Example 10

A pre-filter for an air purification device was prepared in the same manner as in Example 6, except that the process of spraying the silver ion colloidal solution on the surface of the filter substrate and drying under reduced pressure for 10 minutes at 30°C and 0.01 bar was repeated three times. Manufactured.

Example 11

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 50°C and 0.01 bar for 10 minutes.

Example 12

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 50°C and 0.01 bar for 20 minutes.

Example 13

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 50°C and 0.01 bar for 30 minutes.

Example 14

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 70°C and 0.01 bar for 10 minutes.

Example 15

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 70°C and 0.01 bar for 20 minutes.

Example 16

A pre-filter for an air purifying device was manufactured in the same manner as in Example 1, except that the silver ion colloid solution was sprayed on the surface of the filter substrate and dried under reduced pressure at 70° C. and 0.01 bar for 30 minutes.

Comparative Example 1

The silver ion colloid solution applied to the surface of the filter substrate was dried under reduced pressure at 90°C and a pressure of 0.01 bar for 10 to 30 minutes to prepare a pre-filter for an air purification device.

Experiment example

(1) Antibacterial evaluation: Antibacterial evaluation was conducted on Examples 1 to 10 among the above Examples and Comparative Examples. Specifically, based on the test standards for textile fabrics, the number of bacteria was measured after culturing 2 types of standard test strains for 18 hours according to the KS K 0693:2016 standard, and the results are shown in Tables 1-2 and Figures 4-9 below. It was. The control group shows the results of an antibacterial test on a filter substrate to which no silver ion colloid solution was applied.

(* Strain 1: Staphylococcus aureus ATCC 6538, Strain 2: Klebsiella pneumoniae ATCC 4352)

Figures 4 to 6 below are test reports showing the antibacterial activity evaluation results of Examples 1 to 5, and Figures 7 to 9 are test reports showing the antibacterial activity evaluation results of Examples 6 to 10. Referring to the results in Tables 1 to 2 and Figures 4 to 9, it was found that when the prefilter of Examples 1 to 10 of the present invention was applied, it had a bacteriostatic reduction rate of more than 99% and had excellent antibacterial effect.

(2) Evaluation of detachment of antibacterial substances: Among the examples and comparative examples above, a detachment test of antibacterial substances (silver ions) was performed on Examples 1 to 10 and Comparative Example 1. The composition of the detachment test level was applied to analyze trace amounts of inorganic impurities in ultrapure water and purified water through ICP-MS (inductively coupled plasma mass spectrometry). According to the metal impurity test method and validation standards using ICP-MS, silver ions (Ag+) were evaluated based on Class 2B of the ICH guideline metal classification, and the results are shown in Table 3 and Figures 10 to 12.

Figures 10 to 12 are test reports showing the results of antibacterial substance removal evaluation in Examples 1 to 10. Referring to Table 3 and Figures 10 to 12, the prefilter deposited by spraying a silver ion colloidal solution containing 150 ppm of silver ions as in Example 1 had 1.71 ppm of silver ions detected, and as in Example 10, silver ions were detected at 1.71 ppm. It was found that 9.98ppm was detected in the prefilter deposited by spraying a silver ion colloidal solution containing 250ppm three times.

The purpose of spraying the antibacterial material (silver ion colloidal solution) on the surface of the pre-filter from 1 to 3 times is to economically select the number of sprays by comparing the antibacterial effect when sprayed 1 to 3 times. Through the above antibacterial activity test, there is no significant difference in the antibacterial activity between 1 and 3 sprays. However, it was confirmed that the detachment effect occurs more when sprayed 3 times than once, so it is appropriate to spray 1 to 2 times. And it was found.

When evaluating the detachment of antibacterial substances (silver ions) from the prefilter manufactured according to the present invention, it was found that less than 10% of the antibacterial substances were detached based on the initial mass. On the other hand, in the case of Comparative Example 1 in which the drying temperature of the present invention was applied in excess of the drying temperature of the present invention, the silver ion antibacterial material evaporated excessively, so the silver ions were not properly deposited on the surface of the filter substrate, and the amount of desorption was measured to be more than 30 ppm, compared to Examples 1 to 10. It was found that the amount of silver ion desorption rapidly increased, and the antibacterial and antiviral effects decreased.

(3) Wind speed measurement evaluation: Among the Examples and Comparative Examples, the wind speed measurement of the air purifier equipped with the pre-filter of Examples 1 to 10 was evaluated. Figure 13(a) below is a schematic diagram showing the wind speed measurement evaluation method of the example pre-filter, and Figure 13(b) is a photograph showing the wind speed measurement evaluation of the example pre-filter.

As shown in FIG. 13, prepare a wall-mounted/stand-type air purifier with a structure in which a pre-filter, a medium filter, and a HEPA filter are sequentially formed, attach a vinyl tunnel with a length of 3.0 m to the bottom of the air purifier, and then attach the vinyl tunnel to the bottom of the air purifier. A pipe-type product was attached to the extreme end of the pipe to collect wind. At this time, a DK product was used as a wall-mounted air purifier, and a Korea Touchscreen product was used as a stand-type air purifier for evaluation.

As a control, a wall-mounted/stand-type air purifier equipped with a pre-filter, medium filter, and HEPA filter that did not spray silver ions was operated at the maximum wind speed and waited for about 10 seconds to measure the wind speed.

Next, replace and install the pre-filters of Examples 1 to 10, respectively, operate the air purifier, operate at the maximum air volume, wait for about 10 seconds, place the wind speed meter at the end of the pipe, and test with a measuring device (Testo 405-V1 model, The wind speed was measured using (manufactured by Korea) and the results are shown in Table 4 and Figure 14 below.

Figure 14 below is a reliability test certificate related to wind speed measurement evaluation of Examples 1 to 10. Referring to the results in Table 4 and FIG. 14, in Examples 1 to 10 of the present invention, there was no difference in wind speed at the air purifier discharge port compared to the control group to which silver ions were not applied, and through this, the present invention showed that silver ions were deposited through silver ion deposition. It was found that the speed of air passing through the filter substrate did not decrease.

So far, the present invention has been examined focusing on the embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

1: Pre-filter 2: Medium filter
3: HEPA filter 10: Filter base
11: Antibacterial material 100 filter base
110: Antibacterial material

Claims (7)

Applying a silver ion colloidal solution to the surface of a filter substrate; and
A pre-filter manufacturing method comprising: drying the applied silver ion colloidal solution at 80° C. or lower.
The method of claim 1, wherein the application is performed by spraying the silver ion colloidal solution at a pressure of 0.1 to 0.5 MPa using a spray gun with a nozzle diameter of 0.3 to 1.0 mm.
The method of claim 1, wherein the silver ion colloidal solution is prepared by placing a silver (Ag) electrode in an aqueous electrolyte solution containing a dispersant and water and electrolyzing it.
The method of claim 1, wherein the silver ion colloidal solution has a pH of 5.5 to 6.5 and a specific gravity of 1.0 to 1.1,
A pre-filter manufacturing method comprising 0.01 to 0.1% by weight of silver (Ag) and 99.9 to 99.99% by weight of water.
The method of claim 4, wherein the silver (Ag) ions have an average size of 1 to 100 nm.
The method of claim 1, wherein the drying is performed by spraying the silver ion colloidal solution on the surface of the filter substrate one to three times and drying at 30 to 70°C,
A pre-filter manufacturing method that involves drying under reduced pressure at a pressure of 0.001 to 0.9 bar to shorten the drying time and improve the deposition effect.
The method of claim 1, wherein the filter substrate includes one or more of fabric, mesh, and non-woven forms,
A pre-filter manufacturing method, characterized in that the filter substrate includes one or more of polypropylene (PP), polyethylene (PE), and polyester.