KR102380847B1 - Air Filter Media With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof - Google Patents

Abstract

The present invention relates to a filter medium for an air filter having antibacterial properties, biodegradability and water repellency, and a method for manufacturing the same, and more specifically, to a filter medium for an air filter including a biodegradable fiber, a binder fiber, a dispersing agent for dissociation of the biodegradable fiber and the binder fiber, and a wet strength enhancer for increasing wet strength, and a method for manufacturing the same.

Description

Air Filter Media With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof

The present invention relates to a filter material for an air filter having antibacterial properties, biodegradability and water repellency, and a method for manufacturing the same. is about

Contaminants, including fine dust, are scattered in the air, which not only pollutes the environment but also has a harmful effect on the human body.

In general, air filters are used to remove fine substances in the air and prevent them from entering the human respiratory system, and are classified into cabin air filters for vehicles, filters for indoor air purifiers, and air filters for air conditioning according to their use.

The conventionally used air filter media uses a melt blown nonwoven fabric made of PP material.

Since it may take hundreds of years for these conventional air filter media to be completely decomposed when disposed of after use, it not only causes environmental pollution, but also generates toxic gas during incineration, environmental hormone generation, greenhouse gas (CO2) increase, etc. This problem is pointed out.

In order to solve the above problems, research on a biodegradable air filter is being developed, but the biggest obstacle to a biodegradable air filter is that the performance of the filter is deteriorated due to hydrolysis and biodegradation due to moisture or heat during use.

Korean Patent Publication No. 2011-0131665 Korean Patent Publication No. 2015-0032809

The present invention was derived to solve the above problems, and an object of the present invention is to provide a filter material for an air filter having antibacterial, biodegradable and water repellent properties that does not deteriorate due to hydrolysis or biodegradation during use, and a method for manufacturing the same do it with

Another object of the present invention is to provide a filter material for an air filter having antibacterial properties, biodegradability and water repellency that can be naturally decomposed in a short time even if discarded after use, and a method for manufacturing the same.

In addition, an object of the present invention is to provide a filter material for an air filter having antibacterial, biodegradable and water repellent properties, which lowers the defect rate and retains water repellency by suppressing the occurrence of paper breakage during the manufacturing process, and a method for manufacturing the same.

In order to solve the above technical problems, the air filter media having antibacterial properties, biodegradability and water repellency according to the present invention includes a biodegradable fiber, a binder fiber, a dispersing agent for dissociation of the biodegradable fiber and the binder fiber, and a wetting agent It is characterized in that it contains a wet strength enhancer for increasing strength.

In addition, in the filter medium for an air filter according to the present invention, the biodegradable fiber is any one or more of mercerized processed pulp, bamboo pulp, PLA (Poly Lactic Acid) fiber, and natural antibacterial fiber.

In addition, in the filter medium for an air filter according to the present invention, it is characterized in that it further comprises a degassing agent for suppressing the generation of bubbles or air bubbles.

In addition, in the filter medium for an air filter according to the present invention, it is characterized in that it further comprises a water repellent for increasing water repellency.

In addition, in the air filter media according to the present invention, a degassing agent for suppressing the generation of bubbles or air bubbles, and a water repellent agent for increasing water repellency are further included, wherein the biodegradable fiber is a mercerized (Mercerized) processed pulp, Bamboo pulp, PLA (Poly Lactic Acid) fiber, and natural antibacterial fiber, 45 to 55 parts by weight of mercerized processed pulp, 10 to 20 parts by weight of bamboo pulp, 4 to 6 parts by weight of rayon fiber, glass Fiber 10-20 parts by weight, PLA fiber 10-20 parts by weight, natural antibacterial fiber 3-7 parts by weight, binder fiber 3-7 parts by weight, dispersant 0.03-0.07 parts by weight, wet strength enhancer 4-12 parts by weight, degassing agent It is characterized in that it contains 0.03 to 0.15 parts by weight and 3 to 9 parts by weight of the water repellent.

In addition, in the air filter media according to the present invention, the mercerized pulp has a diameter of 10 to 20 μm and a length of 1 to 3 mm, and the bamboo pulp has a diameter of 5 to 15 μm and a length of 1 to 4 mm. and, the rayon-based fiber has a diameter of 10 to 20 μm and a length of 3 to 10 mm, the glass fiber has a diameter of 0.2 to 2.6 μm, and the PLA fiber has a diameter of 10 to 20 μm and a length of 3 to 6 mm, and the natural The antibacterial fiber has a length of 3 to 6 mm and 10 to 20 μm, the binder fiber is a polyvinyl alcohol fiber (PVA, Polyvinylalcohol) having an average melting point in the range of 70 to 100° C., the dispersant is a nonionic surfactant, and the degassing The agent is a higher alcohol-based degassing agent, the wet strength enhancer is an amine-based wet strength enhancer, and the water repellent is a wax-based water repellent.

In addition, in the air filter media according to the present invention, the air filter is characterized in that it is used as a fabric for an automobile cabin filter or air purifier filter.

According to the present invention, there is provided a method for manufacturing a filter media for an air filter having antibacterial properties, biodegradability and water repellency, comprising the steps of: a) preparing a raw material; (b) preparing a raw material mixture by mixing the prepared raw materials; (c) laminating the raw material mixture to the mesh belt; (d) dewatering the raw material mixture laminated on the mesh belt; and (e) performing a water-repellent coating on the dehydrated raw material mixture; including, wherein the raw material is a solvent, mercerized processed pulp, bamboo pulp, rayon-based fiber, glass fiber, PLA fiber, natural antibacterial It is characterized in that it is a fiber, a binder fiber, a dispersant, a wet strength enhancer, a degassing agent and a water repellent agent.

In addition, in the method for manufacturing a filter medium for an air filter according to the present invention, in step (b), 9,900 to 11,000 parts by weight of water as a solvent, 45 to 55 parts by weight of mercerized pulp, and 10 to 20 parts by weight of bamboo pulp , 4 to 6 parts by weight of rayon fiber, 10 to 20 parts by weight of glass fiber, 10 to 20 parts by weight of PLA fiber, 3 to 7 parts by weight of natural antibacterial fiber, 3 to 7 parts by weight of binder fiber, 0.03 to 0.07 part by weight of dispersant; It is characterized in that it contains 4 to 12 parts by weight of a wet strength enhancer, 0.03 to 0.15 parts by weight of a degassing agent, and 3 to 9 parts by weight of a water repellent.

In the method for manufacturing a filter medium for an air filter, after step (e), (f) drying is further performed, wherein the step (f) is hot air drying at 110 to 130° C., hot air at 135 to 145° C. It is characterized in that drying, hot air drying at 100 ~ 110 ℃ and hot air drying at 135 ~ 145 ℃ proceed sequentially.

As described above, according to the filter medium for air filter having antibacterial properties, biodegradability and water repellency of the present invention and its manufacturing method, since a water repellent material is added during the manufacturing process, performance degradation due to hydrolysis or biodegradation during use can be minimized. There is this.

In addition, according to the filter material for air filter having antibacterial, biodegradable and water repellent properties of the present invention and its manufacturing method, it is centered on naturally degradable materials such as Mercerized pulp, bamboo pulp, PLA fiber, and natural antibacterial fiber, so even if it is discarded, it can be decomposed in a short time. It has the advantage of being environmentally friendly.

In addition, according to the filter medium for air filter having antibacterial properties, biodegradability and water repellency of the present invention and its manufacturing method, there is an advantage in that it possesses excellent properties and functionality such as antibacterial properties, air permeability, stiffness and water repellency.

In addition, according to the filter material for air filter having antibacterial, biodegradable and water repellent properties of the present invention and its manufacturing method, since it contains a wet strength enhancer, it suppresses the occurrence of oil breakage during the manufacturing process, and this has the advantage that it can contribute to reducing the defect rate of the support. .

1 is a flowchart illustrating a method of manufacturing a filter material for an air filter having antibacterial properties, biodegradability and water repellency according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments and drawings of the present invention, which will be described in detail enough to allow those of ordinary skill in the art to easily practice the present invention. This is not meant to limit the technical spirit and scope of the present invention.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, a filter medium for an air filter having antibacterial properties, biodegradability and water repellency according to the present invention and a method for manufacturing the same will be described in detail.

First, the air filter media having antibacterial, biodegradable and water repellent properties of the present invention is mercerized-processed pulp, bamboo pulp, rayon-based fiber, glass fiber, PLA fiber, natural antibacterial fiber, binder fiber, dispersant, and degassing agent. agent, a wet strength enhancer, and a water repellent agent.

The mercerized pulp is a skeletal material for the filter material, and it is preferable to have a diameter of 10 to 20 μm and a length of 1 to 3 mm. desirable.

Here, the mercerized (Mercerized) processed pulp is a general term for a reaction to make alkali cellulose by treatment with strong alkali, and generally softwood pulp is alkali-treated, for example, the product name may be HPZ, but is not limited thereto.

The bamboo pulp preferably has a diameter of 5 to 15 μm and a length of 1 to 4 mm, but if it is outside the above range, there is a problem in that the air permeability is reduced, so it is preferably within the above range.

Here, bamboo pulp supplements and maintains the shape of the filter material, improves smoothness, and can expect the natural antibacterial and bacteriostatic functions of the air filter material. In particular, bamboo is an eco-friendly material because it grows rapidly and is biodegradable without the use of chemical fertilizers or pesticides during the growing process.

It is preferable that the rayon-based fiber to supplement and maintain the shape of the filter media together with bamboo pulp has a diameter of 10 to 20 μm and a length of 3 to 10 mm. desirable.

Glass fibers having a relatively small fiber diameter form micropores in the filter media to remove micro-materials in the air, and preferably have a diameter of 0.2 to 2.6 μm. Outside the above range, there are problems in air permeability, pressure loss and efficiency. It is preferable to be

PLA (Poly Lactic Acid) fibers preferably have a diameter of 10 to 20 μm and a length of 3 to 6 mm, and when it is out of the above range, there is a problem in that dispersibility and air permeability are reduced.

Here, PLA fiber is a polymer synthesis of lactic acid made by fermenting vegetable extracts from corn, potato, or sugar cane. It is a biodegradable fiber, of which more than 90% is naturally decomposed within about 6 months, and the breathability of the support can be secured.

It is preferable that the natural antibacterial fiber has a length of 10 to 20 μm and a length of 3 to 6 mm, but if it is out of the above range, problems of dispersibility and antibacterial power occur, so it is preferable to be within the above range. Here, the natural antibacterial fiber may include, but is not limited to, Lyocell.

The binder fiber is for improving the mechanical strength of the filter medium, and may be polyvinylalcohol (PVA) having an average melting point in the range of 70 to 100°C.

The dispersing agent not only can shorten the dissociation time by making these raw materials hydrophilic, but also performs a function of suppressing the aggregation of the raw materials, and may be, for example, a nonionic surfactant.

Wet strength enhancer reduces fat in the process while maintaining its shape, and is composed of polymer and water. Specifically, as an amine-based wet strength enhancer, the product name is called Kymene777LX.

In the process of mixing the raw materials and manufacturing the sheet-shaped filter media, a large amount of fine air bubbles may be generated due to the mixing of atmospheric air or the reaction between substances. The generated air bubbles cause paper breakage, and as a result, the sheet-shaped filter medium cannot be formed, or the strength of the filter material is greatly reduced due to the destruction of the air bubbles during the drying process. In the present invention, a degassing agent is added to solve the above problems, and for example, it may be a higher alcohol-based degassing agent.

On the other hand, the fibers constituting the air filter media of the present invention contain biodegradable fibers and thus have strong hydrophilicity, which may act as a cause of promoting biodegradation too quickly due to moisture and humidity in the air. Therefore, it is good to additionally add a water repellent to suppress the progress of biodegradation during product use, and the water repellent is a known product (eg, product name AF-7000) containing paraffin wax, a surfactant, and water.

On the other hand, the above-mentioned raw materials such as mercerized processed pulp, bamboo pulp, rayon fiber, glass fiber, PLA fiber, natural antibacterial fiber, binder fiber, dispersant, wet strength enhancer, degassing agent and water repellent are 45 to 55 : 10-20: 4-6: 10-20: 10-20: 3-7: 3-7: 0.03-0.07: 4-12: 0.03-0.15: It is preferable to mix in a weight ratio of 3-9.

If the content of mercerized processed pulp is less than the above range, the air permeability of the nonwoven fabric is lowered, making it difficult to commercialize. ) The content of the processed pulp is preferably within the above range.

When the amount of bamboo pulp is less than the above range, the antibacterial performance is lowered, and conversely, when the amount is larger than the above range, the air permeability is lowered. Therefore, the bamboo pulp is preferably within the above range.

When the rayon-based fiber is smaller than the above range, the air permeability is lowered, and conversely, when the rayon-based fiber is larger than the above range, the air permeability is too high, so the rayon-based fiber is preferably within the above range.

When the glass fiber is smaller than the above range, the particle removal efficiency is lowered, whereas when the glass fiber is larger than the above range, the air permeability is too low, so that the glass fiber is preferably within the above range.

When the PLA fiber is smaller than the above range, the air permeability is lowered, and the pressure loss when used as an air filter medium is increased. Conversely, when the PLA fiber is larger than the above range, the air permeability is excessively high, so the PLA fiber is preferably in the above range.

When the natural antibacterial fiber is less than the above range, the antibacterial performance is lowered and bacteria can multiply when used as an air filter medium. desirable.

In addition, when the binder fiber is smaller than the above range, the bonding force between the fibers is lowered. Conversely, when the binder fiber is larger than the above range, the Mercerized pulp, bamboo pulp, glass fiber, PLA fiber and natural antibacterial fiber are relatively small, so that breathability and stiffness are lowered. range is preferred.

When the dispersant is higher than the above range, the bonding force between fibers and the surface smoothness are lowered due to bubbles and air bubbles, so the dispersant is preferably within the above range.

When the wet strength enhancer is lower than the above range, the wet strength is lowered. Therefore, the wet strength enhancer is preferably within the above range.

If the degassing agent is lower than the above range, since bubbles and air bubbles are not removed and the bonding force between fibers and the surface smoothness are lowered, the degassing agent is preferably within the above range.

When the water repellent is lower than the above range, the water repellency is low and the biodegradation inhibiting ability during product use is lowered. Therefore, the water repellent is preferably within the above range.

As a result, when the above mixing range is satisfied, a pressure loss (differential pressure) of 1 to 20 mmAq, a particle removal efficiency of 70 to 99.9%, and an antibacterial activity of 99.9%, etc. required for the air filter media are satisfied.

Next, a method for manufacturing a filter material for an air filter having antibacterial properties, biodegradability and water repellency according to the present invention will be described.

1 is a flowchart illustrating a method of manufacturing a filter material for an air filter having antibacterial properties, biodegradability and water repellency according to a preferred embodiment of the present invention.

As shown in FIG. 1, the air filter media of the present invention comprises (a) preparing a raw material, (b) preparing a raw material mixture by mixing the prepared raw materials, (c) stacking the raw material mixture on a mesh belt. Step, (d) the step of dewatering the raw material mixture laminated on the mesh belt, (e) the step of performing a water-repellent coating on the dewatered raw material mixture, and (f) comprising the step of drying.

First, if the step (a) of preparing the raw material is described in more detail, mercerized processed pulp, bamboo pulp, rayon fiber, glass fiber, PLA fiber, natural antibacterial fiber, binder fiber, dispersant, wetting agent This is a step of preparing an intellectual strength enhancer, a degassing agent, a solvent, and a water repellent, respectively.

Here, the solvent is for each raw material to be mixed evenly, and may be water.

Specific physical properties related to mercerized processed pulp, bamboo pulp, rayon fiber, glass fiber, PLA fiber, natural antibacterial fiber, binder fiber, dispersant, wet strength enhancer, degassing agent, solvent and water repellent are as described above. Since they are the same, overlapping descriptions will be omitted.

(b) of preparing the raw material mixture by mixing the prepared raw materials This is a step of preparing a raw material mixture in the form of a slurry by adding an enhancer and a degassing agent to water as a solvent and stirring the mixture.

At this time, water 9,900 to 11,000 parts by weight of water as a solvent, 45 to 55 parts by weight of mercerized processed pulp, 10 to 20 parts by weight of bamboo pulp, 4 to 6 parts by weight of rayon fiber, 10 to 20 parts by weight of glass fiber parts, PLA fiber 10-20 parts by weight, natural antibacterial fiber 3-7 parts by weight, binder fiber 3-7 parts by weight, dispersant 0.03-0.07 parts by weight, wet strength enhancer 4-12 parts by weight, and degassing agent 0.03-0.15 parts by weight It is preferable to mix in parts proportions.

On the other hand, it is preferable to pre-heat the water as a solvent to 25 ~ 45 ℃, which is that when the water temperature is lower than the above range, the dispersibility and dehydration properties are lowered, and on the contrary, when the water temperature is lower than the above range, the raw material mixture and the mesh in step (c) are higher than the above range. Since it puts a strain on the back, it is preferable that the temperature of the solvent is within the above range.

And the raw material mixture composed of the above mixing ratio is stirred at a speed of 900 to 1100 RPM for about 15 to 25 minutes to obtain a raw material mixture slurry.

The step (c) of laminating the raw material mixture on the mesh belt is a step of laminating the raw material mixture in the slurry state prepared at the same mixing ratio as above on the mesh belt. Specifically, it is supplied to a mesh belt moving at a speed of 15 to 30 m per minute, and the supply amount is preferably 9,000 to 10,000 L per minute.

The step (d) of dehydrating the raw material mixture stacked on the mesh belt is a step of primarily removing water as a solvent by dehydrating the raw material mixture stacked on the mesh belt.

At this time, the dehydration process is performed by applying a primary vacuum at the moment when the raw material mixture is laminated on the mesh belt, and then applying a secondary vacuum additionally to perform the dehydration process.

In the first vacuum dehydration process, four stages of vacuum pressure are applied, in the first stage, 0-5 cmHg, in the second stage, 10-20 cmHg, in the third stage, 30-40 cmHg, and in the fourth stage, a vacuum pressure in the range of 50-65 cmHg is applied. In this process, bonding between fibers is induced through dehydration, and as a result, a non-woven fabric with porosity is formed.

In the second vacuum dehydration process, a vacuum pressure in the range of about 18 to 22 cmHg is applied to remove residual moisture and make the bonds between fibers more dense.

Step (e) of performing water-repellent coating on the dehydrated raw material mixture is a step of dehydrating the raw material mixture laminated on the mesh belt, and then performing water-repellent coating.

Here, based on 9,900 to 11,000 parts by weight of water used as a raw material mixture, about 3 to 9 parts by weight of the water repellent is used, and the water repellent coating is performed by spraying.

Finally, the drying step (f) is a step of completely removing residual moisture, and is achieved by sequentially passing a hot air dryer and a drum dryer. Specifically, after primary drying in a hot air dryer operated at 100 to 170 ° C., more preferably 110 ° C to 130 ° C., after secondary hot air drying at 135 to 145 ° C., and third after hot air drying at 100 to 110 ° C. , the process of passing the fourth drum dryer at 135~145℃ proceeds sequentially.

Here, if the drying is performed at a high temperature at the beginning of the drying step, the drying is rapidly performed, resulting in shrinkage or cracking. Conversely, if it proceeds at too low a temperature, complete binding of the binder fiber is not achieved, and the residual moisture after winding is high, which causes fluff in the subsequent process or has a negative effect such as weakening of bonding strength. It is preferable to dry in the 4-step drying condition.

Thereafter, if necessary, the process of slitting with a slitting device and then storing may be additionally performed.

Hereinafter, the present invention will be described in more detail by way of Examples and Experimental Examples. However, the following Examples and Experimental Examples are merely illustrative of the present invention, and the content of the present invention is not limited to the following Examples and Experimental Examples.

<Example>

Example 1

10,000 L of water heated to 30°C, 50 kg of Mercerized pulp with an average diameter of 10 to 20 μm and an average length of 1 to 3 mm, 5 kg of bamboo pulp with an average diameter of 5 to 15 μm and an average length of 1 to 4 mm, average 5 kg of rayon fibers with an average diameter of 10 to 20 μm and an average length of 3 to 10 mm, 15 kg of glass fibers with an average diameter of 0.2 to 2.6 μm, PLA fibers with an average diameter of 10 to 20 μm and an average length of 3 to 6 mm 15 kg, 5 kg of natural antibacterial fiber with an average diameter of 10 to 20 μm and an average length of 3 to 6 mm, 5 kg of polyvinyl alcohol fibers (PVA, Polyvinylalcohol) with an average diameter of 15 to 20 μm and an average length of 1 to 5 mm, A raw material mixture was prepared by mixing 0.05 kg of a nonionic surfactant, 10 kg of a wet strength enhancer, and 0.1 kg of a higher alcohol degassing agent, followed by stirring for about 20 minutes.

The prepared raw material mixture was laminated on a microfiber mesh belt, and at this time, the feed speed of the mesh belt was 30 m/min, and the supplied raw material mixture was maintained at 10,000 L/min.

In addition, the moment the raw material mixture is laminated on the mesh belt, the first stage of natural dehydration is carried out with a vacuum pressure of 0 cmHg, followed by a vacuum pressure of 10 cmHg in the second stage, a vacuum pressure of 30 cmHg in the third stage, and a vacuum pressure of 50 cmHg in the fourth stage. did

After the first dehydration, 5 kg of water repellent was used for water repellent coating using a spray coating method, and secondary dehydration was performed under vacuum pressure of 20 cmHg.

Finally, the residual moisture is removed by passing through a hot air dryer operating at 110℃~130℃, secondary drying at 135~145℃, tertiary drying at 100~110℃, and a drum dryer at 135~145℃. An air filter medium was prepared.

Example 2

An air filter medium was prepared under the same conditions as in Example 1, except that 0.025 kg of the nonionic surfactant was changed from the raw material mixture.

Example 3

An air filter medium was prepared under the same conditions as in Example 1, except that 5 kg of the wet strength enhancer was changed from the raw material mixture.

Example 4

An air filter medium was prepared under the same conditions as in Example 1, except that 0.05 kg of the higher alcohol-based degassing agent was changed from the raw material mixture.

<Comparative example>

Comparative Example 1

An air filter medium was prepared under the same conditions as in Example 1, except that 40 kg of Mercerized pulp, 5 kg of bamboo pulp, and 25 kg of glass fiber were changed as a raw material mixture.

Comparative Example 2

An air filter medium was prepared under the same conditions as in Example 1, except that 30 kg of Mercerized pulp, 5 kg of bamboo pulp, and 35 kg of glass fiber were changed as a raw material mixture.

Comparative Example 3

An air filter medium was prepared under the same conditions as in Example 1, except that 20 kg of Mercerized pulp, 5 kg of bamboo pulp, and 45 kg of glass fiber were changed as a raw material mixture.

Comparative Example 4

An air filter medium was prepared under the same conditions as in Example 1, except that 10 kg of Mercerized pulp, 5 kg of bamboo pulp, and 55 kg of glass fiber were changed as a raw material mixture.

Comparative Example 5

An air filter medium was prepared under the same conditions as in Example 1, except that 5 kg of bamboo pulp, 15 kg of glass fiber, 9 kg of antibacterial fiber, and 1 kg of PVA were changed as raw material mixtures.

water (L) Mercerized
Pulp (kg) bamboo
pulp
(kg) rayon fiber
(kg) glass
fiber
(kg) PLA Fiber
(kg) antibacterial
fiber
(kg) PVA
(kg) nonionic surfactant
(kg) wet strength enhancer
(kg) degassing agent
(kg) Example 1 10,000 50 15 5 15 15 5 5 0.05 10 0.1 Example 2 10,000 50 15 5 15 15 5 5 0.025 10 0.1 Example 3 10,000 50 15 5 15 15 5 5 0.05 5 0.1 Example 4 10,000 50 15 5 15 15 5 5 0.05 10 0.05 Comparative Example 1 10,000 40 5 5 25 15 5 5 0.05 10 0.1 Comparative Example 2 10,000 30 5 5 35 15 5 5 0.05 10 0.1 Comparative Example 3 10,000 20 5 5 45 15 5 5 0.05 10 0.1 Comparative Example 4 10,000 10 5 5 55 15 5 5 0.05 10 0.1 Comparative Example 5 10,000 50 5 5 15 15 9 One 0.05 10 0.1

* 5 kg of water repellent was used in all Examples and Comparative Examples

<Experimental example>

The physical properties of the air filter media prepared in Examples 1 to 4 and Comparative Examples 1 to 5 were measured, and the results are shown in Table 2 below.

The basis weight was measured by taking 10 or more 100 cm2 samples according to the TAPPI T 410 standard, measuring each weight, obtaining an average value, and correcting it (correction value x 100) to measure the basis weight.

The thickness of the nonwoven fabric was measured with a thickness measuring device suitable for the TAPPI T 411 standard.

Air permeability was measured by the amount of air permeated per unit time according to ASTM D737 standard.

The differential pressure was measured using the TSI 8130 equipment according to ASTM D 2986-91 standard.

The transmittance of particles having a size of 0.3 μm was measured using TSI 8130 equipment according to ASTM D 2986-91 standard.

For stiffness, the bending strength of paper was measured using Gurly Type Stiffness Tester according to TAPPI T 543 standard.

Water absorption was evaluated using the Cobb Sizing Test facility in accordance with the TAPPI T 441 standard to evaluate the absorbency of the paper.

In the antibacterial test, the bacteriostatic reduction rate was calculated using Staphylococcus aureus according to the KS K 0693 standard, and the antibacterial properties of the paper were evaluated.

basis weight
(g/m2) thickness
(mm) breathability
(CFM) differential pressure
(mmAq) efficiency
(%) stiffness
(mg) absorbency
(g/m2) antibacterial
(%) Example 1 89 0.41 11.8 14.1 95.12 320 20.1 99.9 Example 2 88 0.42 14.2 10.8 94.15 358 19.8 99.9 Example 3 90 0.41 12.6 13.5 96.17 346 18.8 99.9 Example 4 91 0.41 12.9 13.5 97.15 328 18.5 99.9 Comparative Example 1 89 0.42 9.1 19.5 99.32 260 18.6 99.9 Comparative Example 2 88 0.43 7.2 30.1 99.92 250 19.1 99.9 Comparative Example 3 90 0.44 5.3 42.8 99.95 248 19.9 99.9 Comparative Example 4 91 0.45 4.2 55.5 99.97 241 19.5 99.9 Comparative Example 5 91 0.41 11.5 13.9 94.89 135 19.4 99.9

As summarized in Table 2, the air filter media manufactured by the manufacturing method of preferred Examples 1 to 4 of the present invention has a basis weight of 89 to 91 g/m2, a thickness of 0.41 to 0.42 mm, air permeability 11.8 to 14.2 CFM, and differential pressure 10.8 to 14.1mmAq, efficiency 94.15~97.15%, stiffness 320~358mg, Cobb 18.5~20.1g/m2, and antibacterial power 99.9%, it can be seen that it has excellent physical properties as a filter material for air filters.

On the other hand, the air filter media manufactured by the manufacturing method of Comparative Examples 1 to 4 had only 4.2 to 9.1 CFM of air permeability, and the differential pressure was greatly increased to 19.5 to 55.5 mmAq. In addition, in the case of stiffness, it was confirmed that it was difficult to perform the function as a filter medium for air filters because it was only 241 to 260 mg.

This is because the content of Mercerized pulp and bamboo pulp is relatively low compared to Examples 1 to 4, while the content of glass fiber is relatively high.

On the other hand, in the case of the air filter media manufactured by the manufacturing method of Comparative Example 5, the ventilation and differential pressure were in a range similar to that of Examples, but relatively little bamboo pulp and PVA were contained while antibacterial fibers were added in excess. It was confirmed that the stiffness was lowered to 241 mg, making it unsuitable as a filter medium for air filters.

So far, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the above description, and the scope equivalent thereto should be construed as being included in the present invention.

Claims (10)

A biodegradable fiber, a binder fiber, a dispersing agent for dissociation of the biodegradable fiber and the binder fiber, a wet strength enhancer for increasing wet strength, a degassing agent for suppressing the generation of bubbles or bubbles, and a water repellent for increasing water repellency including,
The biodegradable fiber is a mercerized (Mercerized) processed pulp, bamboo pulp, PLA (Poly Lactic Acid) fiber, and a natural antibacterial fiber,
45-55 parts by weight of mercerized processed pulp, 10-20 parts by weight of bamboo pulp, 4-6 parts by weight of rayon fiber, 10-20 parts by weight of glass fiber, 10-20 parts by weight of PLA fiber, natural antibacterial 3 to 7 parts by weight of fiber, 3 to 7 parts by weight of binder fiber, 0.03 to 0.07 parts by weight of dispersant, 4 to 12 parts by weight of wet strength enhancer, 0.03 to 0.15 parts by weight of degassing agent, and 3 to 9 parts by weight of water repellent Air filter media, characterized in that.
delete delete delete delete The method of claim 1,
The mercerized (Mercerized) processed pulp has a diameter of 10 to 20 μm and a length of 1 to 3 mm,
The bamboo pulp has a diameter of 5 to 15 μm and a length of 1 to 4 mm.
The rayon-based fiber has a diameter of 10 to 20 μm and a length of 3 to 10 mm,
The glass fiber has a diameter of 0.2 to 2.6 μm,
The PLA fiber has a diameter of 10 to 20 μm and a length of 3 to 6 mm,
The natural antibacterial fiber is 10 to 20㎛ and 3 to 6㎜ in length,
The binder fiber is a polyvinyl alcohol fiber (PVA, Polyvinylalcohol) having an average melting point in the range of 70 to 100 ℃,
The dispersant is a nonionic surfactant,
The degassing agent is a higher alcohol-based degassing agent,
The wet strength enhancer is an amine-based wet strength enhancer,
The water-repellent agent is a filter medium for air filters, characterized in that the wax-based water-repellent agent.
7. The method of claim 6,
The air filter is a filter medium for an air filter, characterized in that it is used as a fabric for an automobile cabin filter or air purifier filter.
(a) preparing a raw material;
(b) preparing a raw material mixture by mixing the prepared raw materials;
(c) laminating the raw material mixture to the mesh belt;
(d) dewatering the raw material mixture laminated on the mesh belt; and
(e) performing a water-repellent coating on the dehydrated raw material mixture; including,
The raw material is a solvent, mercerized processed pulp, bamboo pulp, rayon-based fiber, glass fiber, PLA fiber, natural antibacterial fiber, binder fiber, dispersant, wettability enhancer, degassing agent and water repellent,
In step (b), 9,900 to 11,000 parts by weight of water as a solvent, 45 to 55 parts by weight of mercerized processed pulp, 10 to 20 parts by weight of bamboo pulp, 4 to 6 parts by weight of rayon fiber, 10 parts by weight of glass fiber ~20 parts by weight, PLA fiber 10~20 parts by weight, natural antibacterial fiber 3~7 parts by weight, binder fiber 3~7 parts by weight, dispersant 0.03~0.07 parts by weight, wet strength enhancer 4~12 parts by weight, degassing agent 0.03~ A method of manufacturing a filter medium for air filter, characterized in that it contains 0.15 parts by weight and 3 to 9 parts by weight of a water repellent.
delete 9. The method of claim 8,
After step (e), (f) further performing the drying step,
The step (f) is characterized in that hot air drying at 110 ~ 130 ℃, hot air drying at 135 ~ 145 ℃, hot air drying at 100 ~ 110 ℃ and hot air drying at 135 ~ 145 ℃ proceed sequentially. A method of manufacturing media for air filters.

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