KR20010060509A - Producing method of the folding filter with excellent antibacterial property for liquid purification - Google Patents

Abstract

PURPOSE: A manufacturing method of a bent-up filter for purifying liquid having excellent antibacterial property is provided. The filter is excellent in antibacterial property as well as in removal efficiency of impurities and so is very useful for purifying liquid. CONSTITUTION: The manufacturing method is as follows: (i) prepare master batch by mixing general purpose polypropylene resin and antibacterial agent; (ii) prepare a supporting material using general purpose polypropylene for non-woven fabric and using long-fiber non-woven fabric of polypropylene that is prepared by mixing, melt spinning and web forming; (iii) prepare bent up filter of glass fiber by bending glass fiber media in multi layers, cutting and cladding on the supporting material of step (ii), the first media of glass fiber filter media being 0.1-3.0mm thickness and 2-10μm of average pore diameter and the second media of glass fiber filter media being 0.2-5.0mm thickness and 1-10 μm of average pore diameter, the effective area of filter being 0.4-9m¬2; and (iv) use as an antibacterial agent 0.5-2.0wt.% of total weight of polypropylene of organic antibacterial agent of oxy-bis phenoxazine series.

Description

Producing method of the folding filter with excellent antibacterial property for liquid purification}

The present invention relates to a method for producing a filter after bending the glass fiber-based media in a multi-layered form, and more particularly, to a method for manufacturing a bending filter having excellent antibacterial performance and excellent characteristics of liquid filtration and removal efficiency.

In recent years, as the industry develops, the problem of air, water and soil pollution has emerged as a big social problem. Among them, the problem of water quality has been highlighted as it has a direct effect on human eating and drinking. Therefore, various methods of purifying polluted sewage and purified water for general drinking or drinking water have been studied. In particular, water treatment systems using membranes such as reverse osmosis membranes and ultrafiltration membranes have been actively studied.

The filters used in such water treatment systems are diverse and have a wide range of applications. For example, liquid filters manufactured in a bent form using non-woven fabrics and various kinds of membranes for liquid refining are available in the United States, Japan and Europe. The situation is developed and sold in places.

As the industry develops highly, the demands for air conditioning and liquid filters have rapidly increased in order to integrate and refine industrial devices and to create a pleasant environment for general offices as well as manufacturing processes. However, the glass fiber filters used for air conditioning in the past not only cause secondary pollution by glass fibers in semiconductors and nuclear power plants, but also cause disposal problems, and difficulties in operation during the filter manufacturing process have caused a need for improvement. In the case of meltblown nonwoven fabrics that have been emerging and used for liquids, improvements in short lifespan and low collection efficiency have been required. Accordingly, the development of media for the replacement of glass fiber and the high functionalization of meltblown nonwovens is considered to be an important problem, especially in the United States and Japan. Especially in the case of meltblown nonwoven fabrics, the production and versatility are greatly increased. As a result, the scope of application is gradually expanding. Liquid filters can be largely divided into water treatment and oil treatment, but they are subdivided according to their use, and various characteristics of the media have been required according to their respective uses.

Especially in the case of refining high-viscosity liquids such as glucose, fructose and seasoning process liquids, filters based on fiberglass are mainly used.In this case, the demand for the design of filters with high foreign material removal rate without increasing the flow rate resistance during the refining process Has been going on. In the case of a filter for liquid filtration using glass fiber as a medium, Korean Patent Application No. 93-702356 discloses a glass fiber filter medium having an upward and a downward side using a resin-bonded glass fiber filter medium and an upward and downward side of a filter medium. A method for the manufacture of a filter for high viscosity liquid filtration comprising a pleated filter element containing a polymer mesh located on at least one of the elements has been proposed, but expensive problems with resin-bonded glass fiber filter media and the preparation of glucose, fructose and seasonings When applied to a filter for refining high-viscosity liquids, such as process liquids, the removal efficiency is excellent while having a low flow rate problem. Meanwhile, in order to improve the problem of bacterial propagation due to the glucose component accumulated on the filter outer wall when refining high viscosity liquids such as glucose, fructose, and seasoning process liquids using glass fiber filter media, research and development is given to the filter support. This has been progressed, for example, the method of applying the antimicrobial material in the post-treatment process mainly by the spray method in the process of manufacturing the nonwoven fabric by applying the antimicrobial function to the nonwoven fabric, but the difficulty of process workability and friction Durability deterioration due to washing, medical non-woven fabrics have problems such as safety to the human body. In addition, as a method for improving the above problems, Korean Patent Application No. 93-12277 discloses a method for producing a PP long fiber nonwoven fabric having antimicrobial properties by containing an inorganic ceramic having a large surface area by fine particles in a long fiber. In this case, Korean Patent Application No. 94-26076 discloses a method for preparing PP long fiber nonwoven fabric by adding benzimidazole and biguanide hydrochloride-based compound as an organic antimicrobial agent. There is a problem in that the physical properties of the latter, the latter has a problem that the antimicrobial properties are somewhat insufficient.

The present invention has been made to solve the problems of the organic fiber-based bending filter as described above, in particular, the production of a bending filter for liquid tablets exhibiting excellent antibacterial properties without reducing the basic physical properties of the polypropylene resin used as a nonwoven fabric The purpose is to provide a method.

The present invention is a polypropylene long fiber nonwoven fabric prepared by adding an oxybis phenoxazine-based organic antimicrobial agent as an organic antimicrobial agent when manufacturing a polypropylene long fiber nonwoven fabric as a method for achieving the above object as a support, and the glass fiber media in a multi-layer Disclosed is a method of manufacturing a bending filter, characterized by bending and manufacturing.

Hereinafter, the present invention will be described in detail.

In the present invention, a polypropylene long fiber nonwoven fabric is prepared by adding a general polypropylene resin and an oxybis phenoxazine-based antimicrobial agent to prepare a master batch, and then kneading it with a general purpose polypropylene resin for nonwoven fabrics, such as melt spinning, web forming, and heat bonding processes. The polypropylene long fiber nonwoven fabric thus obtained is used as a support for the up and down surfaces, and the glass fiber media is folded, cut, ultrasonically and thermally bonded to produce a bending filter. .

The range of the oxybisphenoxazine-based organic antimicrobial agent used in the present invention is 0.5 to 2.0% by weight of the total weight of the polypropylene resin used in the entire nonwoven fabric, and when used in less than 0.5% by weight, the antimicrobial activity is insufficient and more than 2.0% by weight is used. There is a problem such as poor purification efficiency.

In addition, the glass fiber media used as the filter media should have a thickness of approximately 0.1 to 3.0 mm for the first glass fiber medium, an average pore size of 2 to 10 μm for the first glass fiber medium, and a thickness for the second glass fiber medium. It is preferable that the average pore size is in the range of 0.2 to 5.0 mm, and the range of 1 to 10 m, and the effective membrane area is 0.4 to 0.9 m 2 in the filter production.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The physical properties measured at this time are measured in the following manner.

-Flow rate: Into the pure water tank, 18megaΩ of pure water and the flow rate according to the initial pressure are evaluated by the flow meter.

-Removal efficiency: Put polystyrene beads in the sewage tank, mix them with pure water at a certain ratio and administer them through the gear pump, measure the number of particles before passing the filter by particle size by the upstream sensor, and then pass through the filter. The fluid is measured by changing the particle count by measuring the particle number of the fluid through the downstream sensor.

Dirt holding capacity: The particles are placed in a sewage tank, circulated until the downstream and upstream differential pressure reaches 35 psi, and then measured by measuring the weight change of the filter.

-Antimicrobial: The antimicrobial performance is evaluated in the state of multilayer media by the Shake Flask method, an evaluation standard of the Japan Textile Products Sanitary Processing Association. In other words, Staphylococcus aureus was inoculated into agar medium and inoculated into a specimen by inoculation with a bacterium cultured at 37 ° C. for 27 hours, and then a certain amount of liquid was added to extract bacteria from the specimen. The percentage of bacteria remaining by the antimicrobial agent is calculated by measuring the number of bacteria remaining.

<Example 1>

92 wt% of polypropylene powder with an average particle diameter of 200 μm with a melt index of 15 μm, 5 wt% of 10,10′-oxybisphenoxazine powder as an antibacterial agent, 2.5 wt% of TiO ₂ powder, and Iganox 1010 (Shibagai as a heat stabilizer) Article)) 0.1% by weight, peroxide (0.4 kg) of master batch components into a mixer, mixed with a screw screw speed 200 ~ 250rpm, using a melt extruder equipped with a twin screw The master batch chip was manufactured under the conditions of the temperature of 200 ~ 220 ℃. The chips are dried in a vacuum dryer at 120 ℃ × 4 hours, kneaded with a polypropylene chip for nonwoven fabric of melt index 35 at 1: 9, melt spun at 210 ℃, and retained antibacterial function through web formation and heat bonding processes. A weight of 60 g / m 2 polypropylene long fiber nonwoven fabric was prepared and used as a support for the multilayer media of up and down surfaces, and the first glass fiber medium having a thickness of 0.35 mm and an average pore size of 3 μm and a thickness of 0.7 mm and an average pore size. Bending filter was prepared by bending, cutting, ultrasonic and thermal bonding process in the usual way under the effective film area of 0.7㎡ with 4μm glass fiber 2nd media with 2㎛, and evaluated the properties 1 is specified.

<Example 2>

Except for changing the antimicrobial 10,10'-oxybis phenoxazine powder in Example 1 to 10% by weight (antibacterial concentration of 1.0%) was carried out under the same conditions and the same method as in Example 1, the results are shown in Table 1 It is specified in.

<Example 3>

Except for changing the antimicrobial 10,10'-oxybis phenoxazine powder in Example 1 to 20% by weight (antibacterial concentration 2.0%) was carried out under the same conditions and the same method as in Example 1, the results are shown in Table 1 It is specified in.

<Example 4>

The same conditions and methods as in Example 1 were changed in Example 1 except that the thickness of the first glass fiber medium was 1.0 mm, the average pore size was 3 μm, and the thickness of the glass fiber second medium was 1.0 mm and the average pore size was 2 μm. It was carried out in, and the results are listed in Table 1.

Example 5

The same conditions and the same method as in Example 1, except that the thickness of the glass fiber first medium was 2.0 mm, the average pore size was 3 μm, and the thickness of the glass fiber second medium was 2.0 mm, and the average pore size was 2 μm. It was carried out in, and the results are listed in Table 1.

<Example 6>

In Example 1, the same conditions and methods as in Example 1 were changed except that the thickness of the first glass fiber medium was 0.35 mm, the average pore size was 6 μm, and the thickness of the glass fiber second medium was 0.7 mm and the average pore size was 6 μm. It was carried out in, and the results are listed in Table 1.

<Example 7>

In Example 1, four layers of 0.35 mm thick, 3 micron average pore size, glass fiber first medium, and a second glass fiber medium of 0.7 mm thickness and 2 μm average pore size were used, and the effective membrane area was 0.4 m 2. Except having changed, it carried out by the same conditions and the same method as Example 1, and the result was specified in Table 1.

<Example 8>

In Example 1, four layers of 0.35 mm thick, average pore size 3 μm, glass fiber first medium, and 0.7 mm thick, average pore size 2 μm were used as four layer media, and the effective membrane area was 0.9 m 2. Except having changed, it carried out by the same conditions and the same method as Example 1, and the result was specified in Table 1.

Comparative Example 1

Polypropylene chips for nonwoven fabrics with a melt index of 35 and TiO ₂ master batches (2.5% by weight) were kneaded at 9: 1 for melt spinning at 210 ° C, followed by web formation and heat bonding to produce general polypropylene long fiber nonwoven fabrics. And a multi-layered support on the downward side, and having a thickness of 0.35 mm, an average pore size of 3 μm, and a glass fiber first medium and a thickness of 0.7 mm and an average pore size of 2 μm as four layer media. The membrane area was bent, cut, ultrasonically and thermally bonded in a conventional manner under the conditions of 0.7 m2 to produce a bent filter. The physical properties were evaluated and the results are shown in Table 1.

Comparative Example 2

In Example 1, except that 10,10'-oxybis phenoxazine powder, which is additive 1, as an antibacterial agent was changed to 30% by weight (antibacterial concentration 3.0%), the same procedure and the same method as in Example 1 were carried out. The results are listed in Table 1.

Comparative Example 3

The same conditions and the same method as in Example 1, except that the thickness of the glass fiber first medium was changed to 4.0 mm, the average pore size of 5 μm, and the thickness of the glass fiber second medium was 6.0 mm, and the average pore size was 5 μm. It was carried out in, and the results are listed in Table 1.

Comparative Example 4

In Example 1, four layers of 0.35 mm thick, 3 μm average pore size and 1 glass fiber first medium, and a second glass fiber medium of 0.7 mm thickness and 2 μm average pore size were used, and the effective membrane area was 0.2 m 2. Except having changed, it carried out by the same conditions and the same method as Example 1, and the result was specified in Table 1.

Comparative Example 5

In Example 1, four layers of 0.35 mm thick, 3 μm average pore size and 1 glass fiber first medium, and a second glass fiber medium of 0.7 mm thickness and 2 μm average pore size were used, and the effective membrane area was 1.3 m 2. Except having changed, it carried out by the same conditions and the same method as Example 1, and the result was specified in Table 1.

As can be seen from the above examples and comparative examples, the bending filter manufactured according to the present invention has excellent flow rate and impurities removal efficiency, but also has excellent antibacterial properties, which is very useful when used for liquid purification.

Claims (3)

After preparing a master batch by mixing a general purpose polypropylene resin and an antimicrobial agent, a polypropylene long fiber nonwoven fabric obtained through a nonwoven fabric manufacturing process such as kneading, melt spinning, and web formation with a general purpose polypropylene resin for nonwoven fabrics is used as a support. In the well-known process of manufacturing a glass fiber bending filter through bending, cutting, and joining a glass fiber filter medium in a multilayered form, an oxybis phenoxazine organic antibacterial agent is used as an antimicrobial agent at 0.5 to 2.0% by weight of the total weight of the polypropylene resin. Method for producing a bending filter for liquid purification excellent in antimicrobial characterized in that it is used According to claim 1, wherein the glass fiber-based media, the glass fiber first medium is 0.1 ~ 3.0㎜ thickness, the average pore size is 2 ~ 10㎛, the second glass fiber medium is 0.2 ~ 5.0㎜ thickness, the average pore size is 1 A method for producing a bending filter for liquid refining having excellent antimicrobial characteristics, characterized by using a range of ˜10 μm. The method of claim 1, wherein the effective membrane area of the filter ranges from 0.4 to 9 m 2.