KR100481054B1 - Method of Absorption Filter Element for Air-Cleaning - Google Patents

Abstract

The present invention relates to a method for manufacturing a dust removal filter material used in a cyclone for dust collector and a dust collecting system for indoor air conditioning. A slurry mixing method is used in which short fiber-type acrylic fibers and adsorption inorganic powder having excellent adsorption characteristics are mixed. After that, it is manufactured through the wet nonwoven fabric manufacturing process for manufacturing the filter material, which is modified from the wet nonwoven fabric manufacturing process of the paper manufacturing process, and thus, the continuous manufacturing process is easy and the preparation of the air purification adsorption filter material with excellent basin removal ability and odor removal adsorption is mixed. It is about a method.

Description

Method of manufacturing adsorption filter material for air purification {Method of Absorption Filter Element for Air-Cleaning}

The present invention relates to a method for manufacturing dust removal filter material used in cyclone for dust collector and dust collection system for indoor air conditioning. More specifically, officetel building, department store, underground mall, subway station, hospital, pharmaceutical company, food It can be used in air conditioning systems such as factories, automobile production lines, and power plants, and it can be used in various filter materials such as air conditioner filters, shock coil filters, automotive air conditioner filters, and masks that require adsorption functions such as odor removal. It can be used, and the continuous manufacturing by mixing the acrylic fiber in the form of short fiber and the inorganic powder with excellent adsorption properties by the slurry mixing method, and then manufactured through the wet nonwoven fabric manufacturing process for manufacturing the filter material modified the wet nonwoven fabric manufacturing process of the paper manufacturing process. Easy to process and combines excellent basin removal ability and adsorption function for odor removal It relates to a method of purification adsorption filter material.

The conventional filter material for air purification is a filter material in the form of a bag filter made by processing polymer synthetic fibers such as polypropylene, polyester, and polyacetal in the form of woven fiber or non-woven fabric. And, it can be broadly classified into a filter material of the sintering filter (sintering filter) made by compression sintering ceramic powder or polymer powder. However, these filter materials have a disadvantage of insufficient adsorption ability to effectively remove various odors, bacteria and tobacco smoke contained in the indoor air as a material for removing only fine dust in the air.

Activated carbon nonwoven fabrics have been developed worldwide to supplement the absence of these adsorptive functions of existing air purification filter materials and are used as air purification filter materials.However, in the case of activated carbon nonwoven fabrics, the manufacturing process is complicated and the manufacturing cost of the filter materials is increased. In addition, there is also a problem that causes the use of a fine dust removal filter material with an activated carbon nonwoven fabric.

In addition, the conventional air purification filter material has a very fine pores for removing fine dust of less than 5㎛ cause a clogging phenomenon of the filter material at the beginning of operation of the air conditioning system to reduce the durability of the filter material for the air conditioning system I have it. In order to solve the problem of clogging of the conventional air conditioning system filter material, that is, shortening of operating time, it is necessary to increase the filtration area of the air conditioning system, that is, the use of the filter material. It also has the disadvantage of high maintenance cost.

In order to solve the above problems of the conventional filter material for air purification, the filter material for air purification, that is, complementing the properties of the conventional filter material, that is, by bonding the porous polymer film to the filter material of the conventional non-woven fabric and woven fabric, both deep filtration and surface filtration Durable filter materials with functionality have been developed. For example, U.S. Patent Nos. 5,059,382 and 4,17,942, A disclose a filter material in which a porous polyester or polypropylene film is adhered to a surface of a nonwoven fabric, such as to remove fine dust in the air and to facilitate dust removal. The filtration performance has been improved, but the fundamental problems of the conventional air purification filter materials, such as the adsorption function for removing odor and tobacco smoke and the fundamental improvement of the durability of the filter material, have not been solved.

Thus, the present invention is to solve the problems of the conventional air purification filter material as described above, after mixing the acrylic fiber and the inorganic powder having excellent adsorption characteristics by a slurry mixing method, the wet nonwoven fabric used in the paper manufacturing process By modifying the manufacturing process to manufacture the adsorption filter material for purifying the atmosphere through the wet nonwoven fabric manufacturing process for manufacturing the filter material, the continuous manufacturing process of the filter material is easy, and the excellent durability of fine dust removal and the odor removal adsorption function are combined. The purpose is to provide a multifunctional filter material designed.

In addition, the adsorption function is added to the air purification filter material, which reduces the installation area by about 30 to 40% compared to the conventional air purification filter material, and has a very low cost of installation and maintenance and management costs by applying the adsorption function. In addition, the main purpose is to provide a very economical filter material in terms of manufacturing cost by using a short fiber type acrylic fiber, which is a very low material cost as a main raw material, and introducing a wet nonwoven fabric manufacturing process capable of mass production.

In addition, an object of the present invention is to provide an air purification adsorption filter material that can be applied to air conditioning systems for removing harmful gases and odors generated in subways, hospitals, and the like, as well as various building air conditioners.

In order to achieve the above object, the present invention provides a method for preparing the filter material for purifying the air, wherein the particle diameter is 0.05 to 1 μm, 5 to 40 wt% of the adsorbed inorganic powder, 15 to 40 wt% of the short fiber waste acrylic fiber, and water 20 Mixing 80% by weight to form a slurry to dissociate the acrylic fibers in the pulper and mix the slurry; Molding the filter material in a molding machine; Dewatering process in the compressor; And a drying step in the dryer.

In addition, 15 to 40% by weight of the waste fiber in the form of short fibers and 20 to 80% by weight of water is mixed and processed into a slurry form to dissociate the acrylic fibers in the pulper and to mix the slurry; Molding the filter material in the molding machine while simultaneously injecting the slurry and 15 to 40% by weight of the granular adsorption inorganic powder having a particle diameter of 0.1 to 1 mm into the molding machine at the same time; Dewatering process in the compressor; And a drying step in the dryer.

The present invention will be described in more detail as follows.

1 and 2 show flowcharts of a process of manufacturing the filter material of the present invention through a continuous manufacturing process. This will be described with reference to the following.

First, FIG. 1 is a process chart when the particle size of the adsorbent inorganic powder is fine, and the acrylic fiber of the short fiber form as the raw material, the adsorbed inorganic powder and water are mixed at a predetermined ratio, and then the dissociation of the acrylic fiber and The mixture is added to a pulper for mixing the slurry, and the mixing process is performed at a constant stirring speed.

Acrylic fiber in the form of short fibers can be used waste acrylic fiber, if the waste acrylic fiber can be subjected to pre-treatment, such as fiber washing. The waste acrylic fiber can be obtained in large quantities in an acrylic fiber manufacturing plant and a recycling collection company, and the waste acrylic fiber thus obtained may be used.

It is preferable that the addition amount of the acrylic fiber in the form of short fibers is 15 to 40% by weight. If the amount is less than 15% by weight, the use of a large amount of water causes an excessive problem of using inorganic adsorption materials and other materials, and 40% by weight. If exceeded, mixing of the slurry may be difficult.

In addition, the adsorbent inorganic powder is not particularly limited, and examples thereof include activated carbon, zeolite, clay, clay and the like having a particle size of 0.05 to 100 µm. The addition amount is 5 to 40 weight%, and it is preferable that the addition amount of water is 20 to 80 weight%. If the amount of the adsorbed inorganic powder exceeds 40% by weight, it is difficult to implement the wet slurry manufacturing process.

As described above, a predetermined amount of the slurry mixed in the pulper is introduced into a molding process to be molded into a desired filter material.

Next, a compression process for removing moisture is performed through a compression process to form a wet nonwoven fabric containing a minimum amount of water. Pressure during compression process is 1 _~ 10kg _f / ㎠ It should just be about, and it is preferable that the quantity of moisture after compression is about 5 to 10%.

Finally, the compression molded wet nonwoven fabric is dried in a drying roller. When drying, the temperature should be 80 to 100 ° C. If the temperature is above this temperature range, deformation of the acrylic nonwoven material occurs. There may be a problem.

On the other hand, in the case of using inorganic fine particles of granular 0.1-1mm size, which are not as fine as the above-mentioned adsorption inorganic powder, when mixed with short-fiber acrylic fibers and water to make a slurry, they will sink and cannot be uniformly dispersed. As shown in FIG. 2, it is preferable to mix the short-fiber acrylic fibers and water only, and then to add the slurry to the molding process, and to separately prepare granular adsorbent inorganic powder into the molding process.

Even when granular adsorption inorganic powder is used, the order and conditions of the compression process and the drying process following the forming process are the same as those of using fine inorganic fine particles.

By continuously performing the above manufacturing process has a feature that the manufacturing cost of the filter material is very low.

On the other hand, in order to further improve the fine dust removal ability on the surface of the dried adsorption filter material may be added a step of heat-bonding a separate electrostatic nonwoven fabric or the like after drying. Examples of the electrostatic nonwoven fabric that can be used at this time include a polypropylene electrostatic nonwoven fabric having a surface charge density of 50 to 300 µC / m 2 and a ventilation of 20 to 30 CC / mm 2 sec, but is not limited thereto. In addition, the thermal bonding is preferably carried out at a temperature of 100 ~ 160 ℃.

After the drying of the filter material in the continuous manufacturing process as described above, if the cut to meet the specifications of the filter system to be applied can be obtained the adsorption filter material for atmospheric purification according to the present invention.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.

Example 1

Activated carbon was selected as the adsorbent inorganic powder, and the average particle size of the activated carbon used in the experiment was ground to 1 μm or less. 15% by weight of activated carbon pulverized to an average particle size of 1 μm or less, 25% by weight of short-fiber type acrylic fiber (by-product waste acrylic fiber obtained from an acrylic manufacturing plant), and 60% by weight of water, followed by pulper At 1000 rpm for 5 hours, the acrylic fiber was dissociated.

A certain amount of slurry uniformly mixed with activated carbon powder and acrylic fiber was put into the filter material molding machine, and then passed through a drying roller at 90 ° C. through a compression process applying a pressure of 10 kgf / cm 2 to obtain an adsorptive acrylic filter material containing activated carbon powder. Prepared.

Example 2

A filter material was manufactured in the same manner as in Example 1, except that zeolite was used as the adsorbed inorganic powder. At this time, the average particle size of the zeolite was also added by grinding down to 1㎛ or less, the addition amount of the zeolite, acrylic fiber and water and the filter material processing method is the same as in Example 1.

Example 3

A filter material was prepared in the same manner as in Example 1, except that activated clay was used as the adsorbed inorganic powder. At this time, the average particle size of activated clay was also used to grind to 1㎛ or less, the amount of activated clay, acrylic fiber and water and the filter material processing method is the same as in Example 1.

Example 4

A filter material was prepared in the same manner as in Example 1, except that 10 wt% of granular activated carbon having a diameter of 0.5 mm was separately prepared and added together with the slurry into the molding machine. Forming method of the filter material is the same as in Example 1.

Example 5

The filter material was manufactured in the same manner as in Example 1, and then ESCD, that is, a polypropylene electrostatic nonwoven fabric having a surface charge density of 200 μC / m 2 and a permeability of 40 CC / mm 2 sec was thermally bonded to the surface of the filter material. That is, by adhering the electrostatic nonwoven fabric having static electricity on the surface of the adsorption filter material, an adsorption filter material having improved fine dust removal ability by the electrostatic nonwoven fabric was prepared.

Comparative Example 1

A filter material was prepared in the same manner as in Example 1, except that an acrylic fiber nonwoven fabric was prepared in which no adsorption inorganic powder was added. That is, a filter material was manufactured by processing the slurry mixed with 40% by weight of acrylic fiber and 60% by weight of water by the same filter material processing method as in Example 1.

Comparative Example 2

A filter material composed of only a polypropylene electrostatic nonwoven fabric to which the adsorption filter material was not bonded was prepared.

Experimental Example 1

The cross section of the filter material obtained according to Examples 1 to 5 and Comparative Examples 1 to 2 was observed by a surface structure observation method using SEM, and the results are shown in FIGS. 3A to 3C.

3A is a SEM photograph of the cross section of the filter material obtained according to Comparative Example 1, FIG. 3B is a SEM photograph of the filter material obtained according to Example 1, and FIG. 3C is a SEM photograph of the filter material obtained according to Example 4. It is.

As shown in Figures 3a and 3c, the filter material obtained according to the present invention can be seen that the acrylic fiber and the adsorbent inorganic powder are evenly distributed and form pores in the filter material. However, according to Figure 3c it can be seen that the granular activated carbon of large particle size is located in the nonwoven fabric structure formed by the fibers and fibers.

Experimental Example 2

"Bubble Point Tester" was used to measure the average pore size of the air purification filter material obtained in Examples 1 to 5 and Comparative Examples 1 and 2, the size of the filter material used in the experiment was 28mm in diameter, 5mm in thickness. .

The average pore size measurement result by "Bubble Point Tester" is shown in Table 2 below.

Example Comparative example One 2 3 4 5 One 2 Average pore size (㎛) 5 4 5 5 4 6 10

Experimental Example 3

Filtration test of the adsorption filter materials obtained in Examples 1 to 5 and Comparative Examples 1 to 2 was performed by the following method, and a schematic view of the filtration tester used in the experiment is shown in FIG. 4.

In order to test the filtration performance of the air conditioning filter material, a tester was manufactured according to the type 3 standard of KS B 6141 which is the KS standard for the performance tester of the filter material.

When a certain amount of fine dust and air are supplied from the dust feeder 1, the supplied fine dust and air pass through the test filter unit 2 of the filtration tester to the blower 6, and are installed in the output of the filtration tester. The filter 4 was separated to calculate the weight of the fine dust deposited on the absolute filter and the filtration efficiency of the test filter material was measured. The results are shown in Table 2 below.

In performing the filtration test of the filter material, the filtration efficiency of the filter material was added 0.5g / min of fine carbon black dust to the air, the initial air flow rate was adjusted to 3.93m / sec. The filtration test was performed by adjusting the cross-sectional area of the filter material used for the filtration test to 1,000 cm 2. When the total amount of dust added was 32 g, the filtration test was stopped and the filtration efficiency up to that time was measured. The filtration test was carried out for 2 hours, and the filtration efficiency was measured by measuring the weight of the collected dust and the weight of the collected dust by separating the absolute collecting filter for passing dust collection. Calculated by

(Equation 1)

In the above formula, W ₁ is the weight (g) of the total fine dust supplied, W ₂ is the weight (g) of the fine dust collected in the absolute collection filter for collecting.

Example Comparative example One 2 3 4 5 One 2 Filtration efficiency (%) 99.8 99.8 99.8 99.8 99.9 99.8 99.9

From the filtration efficiency test results of the filter material for atmospheric purification of Table 2, the filtration efficiency of the filter materials of the present invention having an average pore size of 4 ~ 6㎛ of the filter material are all 99.8% or more, showing excellent filtration efficiency have.

The filtration efficiency of Comparative Example 1, that is, the filter material made of only acrylic fibers and Comparative Example 2, which is an electrostatic nonwoven fabric, also showed excellent filtration efficiency of 99.8% or more.

Therefore, it can be seen that the fine dust removal ability of the filter material and the comparative filter material shown in Example is almost similar.

Experimental Example 4

In order to test the adsorption capacity of the filter material obtained in Examples 1 to 5 and Comparative Examples 1 to 2, the methylene blue adsorption test method of KS M 1802 was applied, and the adsorption test method applied was as follows.

Adsorption experiment was performed by modifying the temperature dilution method in consideration of the UV absorption amount by KS M 1802. 9.08 g of potassium dihydrogen phosphate was dissolved in distilled water to make 1,000 ml, and then 23.88 g of disodium dihydrogen phosphate (12 hydrate) was dissolved in water to make 1,000 ml. A phosphate buffer was prepared by mixing the potassium dihydrogen phosphate solution and the disodium dihydrogen phosphate solution in a ratio of 4: 6 by volume. 1.5 g of methylene blue was completely dissolved in 1,000 ml of phosphate buffer, and 100 ml of the sample was collected and placed in a 200 ml flask. 0.4 g of a filter material to be tested for adsorption capacity was added thereto. Shaking at 125 rpm, 0.1 ml of the sample was taken every hour, and 9.9 ml of distilled water was added and diluted. UV measurements were performed at 665 nm using phosphate buffer as a control. A calibration curve was prepared to measure the adsorption concentration of the filter material.

In the equilibrium adsorption experiment, the concentration of methylene blue was changed to 1,000 ml of distilled water to completely dissolve it. Then, 100 ml was collected and put into a 200 ml flask. Then, 0.1 g of the filter material to be tested for adsorption capacity was mixed and diluted with 200 ml. UV was measured.

Methylene blue adsorption test results of the filter material according to the Example and Comparative Example are shown in FIG.

From the results of the adsorption capacity test of the filter material for atmospheric purification of Figure 5, it can be seen that the adsorption capacity of the filter material according to the present invention is very excellent.

In the adsorption experiment using methylene blue, first measure the UV absorption amount of the methylene blue aqueous solution with different concentrations, draw a calibration curve using this, and then perform the adsorption experiment. Quantity can be estimated.

As a result of adsorption experiment, the graph shows the concentration of methylene blue adsorbed on the x-axis and the concentration of methylene blue adsorbed on the y-axis, and the concentration of methylene blue adsorbed on the filter material in the area where there is little change in the x-axis. . The concentration of the adsorption test of the filter material for atmospheric purification indicates the adsorption amount of the filter material.

As shown in FIG. 5, the adsorption test result of the air purification filter material, it can be seen that the adsorption capacity of the air purification filter material of the present invention is very excellent.

Specifically, in the case of Example 4 shows an adsorption amount of 560 mg / g, Example 1 is 535 mg / g, Example 5 is 505 mg / g, Example 2 is 420 mg / g, Example 3 is excellent of 378 mg / g It can be seen that the adsorption capacity is shown respectively. However, in the case of Comparative Example 1, in which the adsorption inorganic powder was not added, the adsorption amount was almost as low as 34 mg / g, and in Comparative Example 2, the adsorption amount was also very low as 21 mg / g.

As described above, the air-conditioning adsorption filter material to which the adsorption inorganic material is added according to the present invention uses acrylic fiber as a main raw material, and an inorganic adsorption powder having excellent adsorption characteristics is deposited between the surface of the acrylic fiber and the acrylic fiber to form an acrylic fiber. In addition to excellent fine dust removal ability, adsorption characteristics that are easy to remove harmful gases and odors by the adsorbed inorganic materials were shown. In addition, by adopting a wet nonwoven fabric manufacturing process capable of a continuous manufacturing process, mass production is easy, and it is possible to exert an excellent effect in terms of economics, and the obtained air purification adsorption filter material is used for various office buildings, subways, hospitals, airports, When used as a filter material for air conditioning systems such as ports and large underground arcades, the quality of indoor air can be improved by providing excellent filtration characteristics and excellent ability to remove harmful gases and odors by adsorption characteristics. Can improve the quality.

1 is a flow chart of the manufacturing process of the adsorption filter material using particulate adsorption inorganic powder,

Figure 2 is a flow chart of the manufacturing process of the adsorption filter material using the granular adsorption inorganic powder,

3 is a SEM photograph of a cross section of an adsorption filter material (× 400).

3A is a SEM photograph of a cross section of the adsorption filter material obtained in Comparative Example 1 (x400),

3B is a SEM photograph of a cross section of the adsorption filter material obtained in Example 1 (x400),

FIG. 3C is a SEM photograph of a cross section of the adsorption filter material obtained in Example 4, and FIG.

4 is a schematic view of a filtration tester for measuring the filtration characteristics of the filter material for atmospheric purification,

5 is a methylene blue adsorption test results of the filter material for atmospheric purification.

* Description of the symbols for the main parts of the drawings *

1-Dust Feeder 2-Filter Unit

3-Digital Manometer 4-Absolute Filter

5-Anemometer 6-Blower

Claims (7)

(Correction) Mixing 5-40% by weight of the adsorbed inorganic powder with a particle diameter of 0.05-1 μm, 15-40% by weight of waste acrylic fiber in the form of short fibers , and 20-80% by weight of water, dissociated the acrylic fiber from the pulp and slurry Mixing process; Molding the slurry into a filter material; Dewatering the moldings in a compressor; And A method for producing an adsorption filter material for atmospheric purification, which comprises a step of drying in a dryer. (Correction) mixing 15 to 40% by weight of waste acrylic fibers in the form of short fibers and 20 to 80% by weight of water to dissociate the acrylic fibers from the pulp and mix the slurry; Molding the slurry into a filter material while simultaneously introducing 15 to 40% by weight of the granular adsorption inorganic particles having a particle diameter of 0.1 to 1 mm into a molding machine; Dehydration in a compressor; And A method for producing an adsorption filter material for atmospheric purification, which comprises a step of drying in a dryer. (delete) (delete) (delete) The method of claim 1 or 2, further comprising thermally bonding an electrostatic nonwoven fabric having static electricity to the dried filter material surface. (delete)