KR20150079132A - Air filter and manufacturing method thereof - Google Patents

Abstract

An air filter manufactured by a method for manufacturing the air filter of the present invention does not generate elongation, has high collecting efficiency, and can improve QF index. The air filter of the present invention comprises: an electrostatic non-woven fabric support layer including a static agent and an antioxidant; and an electrostatic medium layer laminated on at least one surface of the electrostatic non-woven fabric support layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an air filter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter and a method of manufacturing the same, and more particularly, to an air filter capable of achieving a low differential pressure and filtration efficiency and a method of manufacturing the same.

An air purifier is provided for filtering and removing various foreign substances contained in the air in various devices such as an internal combustion engine, a gas turbine, an air purifier, and an air conditioner. Various types of filter media are installed as filter media in such an air purifier . As described above, the filter media installed in the air purifier filters various foreign substances contained in the air supplied for the operation of the device, thereby assuring normal operation of the device and extending the service life of the device. Therefore, it is essential that such filter media have both a high filtration efficiency for effectively collecting foreign matter and a long filtration life. However, in order to efficiently collect various kinds of foreign substances in the air, it is necessary to finely form a ventilation hole of the filter medium material, so that the ventilation hole is closed early and the number of the filtration water of the filter medium material is shortened. On the contrary, if the ventilation hole of the filter medium is formed large, the filtration efficiency of the filter medium is significantly lowered because minute foreign substances are escaped through the vent hole instead of extending the name of the filtration water. Therefore, it is urgently required to develop a filter material for air purifying filter having both a filtering efficiency for effectively collecting foreign matter and a long filtration life.

At present, the internal combustion engine is driven by using liquid fuel such as gasoline, light oil, or gaseous fuel such as LPG, and the fuel is supplied into the combustion chamber in the form of mixed gas mixed with air to cause combustion explosion. The air introduced into the internal combustion engine to form the mixed gas is mixed with foreign substances such as dust. Such foreign substances cause incomplete combustion of the mixed gas, which makes operation of the internal combustion engine difficult, and also accumulates on the inner wall of the cylinder The durability of the internal combustion engine is lowered.

Therefore, the internal combustion engine is provided with an air purifier for preventing foreign matter from entering the air, and filter paper or nonwoven fabric is mainly used as the air filter medium. Meltblown nonwoven fabrics and spunbond nonwoven fabrics are mainly used as support layers for the air filter. The meltblown nonwoven fabrics are formed by spinning (spraying) a polymer capable of forming thermoplastic fibers through a spinneret formed of several hundred small orifices , And the polymer extruded from the spinning nozzle means a self-bonding type nonwoven fabric in which microfine fibers superimposed by hot air blown at high speed from both sides of the spinneret in a molten state are laminated on the collecting body.

Such a meltblown nonwoven fabric exhibits excellent properties as a medium- and high-performance filter. Medium and high performance filters refer to filters corresponding to the MERV levels 7 to 16 of the American Air Filter Standard ANSI / ASHRAE 52.2 (1999). The higher the MERV value, the better the filter efficiency and the higher the class of filter. The medium filter is used by being pleated to maximize the efficiency of the filter in use, and the meltblown nonwoven fabric has poor shape stability after bending because of its flexible characteristics. That is, there is a strong tendency to return to the original shape without maintaining the bending form after bending. As a result, the contact efficiency between the air and the filter is deteriorated, so that the filter efficiency is lowered and the pressure loss is increased.

Occurs. Therefore, the shape-retaining performance of the filter is indispensably required, especially in automotive cabin filters or high-efficiency medium filters in which a large amount of air is introduced into a small filter area. A method of laminating a spunbond nonwoven fabric in order to impart shape-retaining performance to the meltblown nonwoven fabric has been proposed.

Japanese Patent Publication No. 63-51725 discloses a nonwoven fabric in which a spunbond nonwoven fabric is disposed on both sides of a meltblown nonwoven fabric as a nonwoven fabric to be used as a filter cloth of an air cleaner and the respective fiber layers are bonded using a resin adhesive. Japanese Patent Publication No. 62-2060 discloses a filter obtained by bonding a meltblown nonwoven fabric in an immobilized state to a spunbonded nonwoven fabric made of stretched fibers.

However, the conventional air filter is not only weak in tensile strength but also excessively high in differential pressure in the laminating process, resulting in a large pressure loss, and has limitations in improving the collection efficiency and QF index.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an air filter and a manufacturing method thereof capable of improving the QF index while having high collection efficiency.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-mentioned problems, and an air filter of the present invention comprises: an electrostatic nonwoven fabric supporting layer comprising an antistatic agent and an antioxidant; And an electrostatic binding material layer laminated on at least one side of the electrostatic nonwoven fabric supporting layer, and all of the following conditions (1) and (2) are satisfied.

(1) a collection efficiency of at least 99.5% and

(2) a QF index value calculated by the following formula is not less than 2.5

[Relational expression]

QF index (1 / mmAq) = [- ln ((100 - R) / 100)] /

Where R is the collection efficiency and? P is the differential pressure.

According to a preferred embodiment of the present invention, the electrostatic nonwoven fabric may be a dry nonwoven fabric, a spun lace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a needle punch nonwoven fabric or a stitch bonded nonwoven fabric.

According to another preferred embodiment of the present invention, the electrostatic nonwoven fabric may include any one or more fibers selected from the group consisting of nylon, polyester, polyurethane, polyacrylonitrile, polyolefin and cellulose.

According to another preferred embodiment of the present invention, the thickness of the electrostatic nonwoven fabric may be 0.1 to 10 mm.

According to another preferred embodiment of the present invention, the charging agent may be a hindered amine-based antistatic agent.

According to another preferred embodiment of the present invention, the hindered amine-based charge control agent is a poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine- ] - [[(2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4- piperidyl) .

According to another preferred embodiment of the present invention, the electrostatic nonwoven fabric supporting layer may further include an antioxidant, more preferably, the antioxidant may be a hindered phenol-based polymer, more preferably the hindered phenol- The antioxidant may be pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate).

According to another preferred embodiment of the present invention, the electrostatic nonwoven fabric supporting layer and the electrostatic filter material can be electrostatically processed through a corona discharge, a plasma charging, a frictional charging or a water charging method through a high-pressure water droplet.

According to another preferred embodiment of the present invention, the basis weight of the electrostatic nonwoven support layer may be 15 to 300 g / m 2.

According to another preferred embodiment of the present invention, the collection efficiency may be 99.9% or more and the QF index value may be 2.7 or more.

According to another preferred embodiment of the present invention, there is provided a method for manufacturing an air filter, comprising the steps of: (1) forming an air filter filter material by laminating a nonwoven fabric support layer containing an antistatic agent and an antioxidant and a filter material layer on at least one side of the nonwoven fabric support layer; (2) electrostatic processing the air filter material.

According to another preferred embodiment of the present invention, the electrostatic treatment can be carried out through a corona discharge, a plasma charging, a frictional charging or a water charging method through a high-pressure water droplet.

According to another preferred embodiment of the present invention, the charging agent may be a hindered amine-based antistatic agent. The hindered amine-based charge control agent is a poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[ -Tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino].

According to another preferred embodiment of the present invention, the electrostatic nonwoven fabric may further include an antioxidant, more preferably the antioxidant may be a hindered phenol-based material, more preferably the hindered phenol-based antioxidant The inhibitor may be pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate).

According to another preferred embodiment of the present invention, the laminate may be formed by ultrasonic bonding, thermal bonding, hot melt bonding, needle punching, water entangling, stitch bonding or adhesive bonding.

Hereinafter, terms used in the present invention will be described.

The term " polyolefin " refers to any of the polymeric hydrocarbon series of saturated open chains consisting solely of carbon and hydrogen atoms. Typical polyolefins include polyethylene, polypropylene, polymethylpentene and various combinations of ethylene, propylene and methylpentene monomers.

The term "polypropylene " (PP) includes not only a homopolymer of propylene, but also a copolymer which is a propylene unit having a repeating unit of 40% or more.

The term " polyester " is a concept involving polymers which are linked by the formation of ester units and which are condensation products of dicarboxylic acids with dihydroxy alcohols having a repeat unit of at least 85%. These include aromatic, aliphatic, saturated and unsaturated diacids and these alcohols.

Further include copolymers and blends and modifications thereof. A typical example of the polyester is polyethylene terephthalate (PET) which is a condensation product of ethylene glycol and terephthalic acid.

INDUSTRIAL APPLICABILITY The air filter manufactured through the wool of the present invention not only does not cause elongation but also can improve the QF index while having high collection efficiency.

1 is a sectional view of an air filter according to a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

As described above, the conventional air filter is not only weak in tensile strength but also excessively high in differential pressure in the laminating process, resulting in a large pressure loss, and has limitations in improving the collection efficiency and QF index.

Accordingly, in the present invention, the air filter of the present invention comprises: an electrostatic nonwoven fabric supporting layer comprising a charging agent and an antioxidant; And an electrostatic binding material layer laminated on at least one side of the electrostatic nonwoven fabric supporting layer, and all of the following conditions (1) and (2) are satisfied.

(1) a collection efficiency of at least 99.5% and

(2) a QF index value calculated by the following formula is not less than 2.5

[Relational expression]

QF index (1 / mmAq) = [- ln ((100 - R) / 100)] /

2 is a cross-sectional view of an air filter according to a preferred embodiment of the present invention. More specifically, the air filter of the present invention includes an electrostatic filter material layer 310 laminated on at least one surface of an electrostatic nonwoven fabric supporting layer 300 including a charging agent and an antioxidant, and the air filter of the present invention has the above- 2).

First, the electrostatic nonwoven fabric supporting layer 300 of the present invention will be described. The electrostatic nonwoven fabric supporting layer 300 of the present invention imparts post-processing such as bending and shape stability after processing, and at the same time, collects particles passing through the electrostatic filter material layer, and must contain a charge stabilizer and an antioxidant.

The electrostatic treatment is a method of enhancing the collecting ability by imparting a static electricity to a nonwoven fabric which is conventionally performed. When the meltblown nonwoven fabric is subjected to an electrostatic treatment, the filament constituting the meltblown nonwoven fabric has a forcedly polarized electric charge therein, A nonwoven fabric made of filaments having a given charge can easily transfer charged fine particles

It is collected.

Such an electrostatic treatment process can be performed using a corona discharge, a plasma charging, a triboelectrification, and a mercury charging method using a high-pressure water droplet. Among these methods, the corona discharge method is carried out in such a state that the cold corona discharge which is discharged after the filament of the molten polymer is completely cured and the free charge in the filament fiber are relatively free since the filament is not completely cured There is a hot corona discharge system. The corona discharge method may be performed at a voltage of 30 to 60 kV. If the voltage is less than 30 kV, the desired polarization efficiency can not be obtained because the electric polarization rate is too low. On the other hand, if the voltage exceeds 60 kV, defects such as holes may easily occur in the nonwoven fabric, It can be fatal. The corona discharge method can be performed at a current of 0.1 to 6.0 mA. If the current is less than 0.1 mA, it is impossible to give sufficient electrostatic performance because the amount of charge movement is small, whereas if the current exceeds 6.0 mA, it may be fatal to an operator.

The present invention further includes an antistatic agent to maximize the electrostatic effect, and in this case, it may further include a commonly used antistatic agent. In this case, it is preferable to use a hindered amine-based charge control agent, and in this case, preferably N, N'-bis-3- (3 ', 5'-di- Bis [3- (3'-methyl-5'-tert-butyl-4'-hydroxyphenyl) propionyl] diamine, N, N'-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) -propionyl] hydrazine, N-salicyloyl-N'-salicylidenehydrazine, 3- 2,4-triazole, and N, N'-bis [2- {3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy} ethyl] oxyamide. Most preferably poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[(2,2,6,6- -4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]]) is most effective in improving the physical properties (see Table 1) ). The hindered amine based charge agent is present in an amount of from about 0.05 to about 5 weight percent of the total polymer, more preferably the additive (s) is present in an amount of from about 0.2 to about 2 weight percent of the polymer, May be present in an amount of from about 0.2 to about 1 percent by weight of the polymer.

Also included are antioxidants, in which case most preferably hindered phenolic antioxidants can be used. Preferred hindered phenolic antioxidants include n-octadecyl-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) -propionate,

Methyl-5'-tert-butyl-4'-hydroxyphenyl) -propionate, n-tetradecyl-3- (3 ', 5'- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,6-hexanediol-bis [3- Di-tert-butyl-4-hydroxyphenyl) propionate], 2,6-di-tert- butyl-4-methylphenol, 2,2'- Butyl-5-methyl-4-hydroxyphenyl) propionate], tetrakis [methylene-3- (3 ', 5'-di-tert-butyl-4-hydroxyphenyl) propionate] methane, 3,9-bis [2- {3- Methylphenyl) propionyloxy} -1,1-dimethylethyl] 2,4,8,10-tetraoxaspiro (5,5) undecane, and most preferably, pentaerythritol tetrakis - (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) It is most effective in improving physical properties .. For the hindered phenolic antioxidant may be present in an amount of from about 0.01 to about 5% by weight of the total polymer.

The nonwoven fabric may be a dry nonwoven fabric, a spun lace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a needle punch nonwoven fabric or a stitch-bonded nonwoven fabric, and more preferably, May be spunbonded nonwoven fabrics, which can typically be produced by a method for producing these nonwoven fabrics.

The nonwoven fabric material that can be used in the present invention is typically a thermoplastic polymer resin used in the manufacture of nonwoven fabrics. Preferably, the thermoplastic polymer is selected from the group consisting of ethylene, propylene, 1-butene, 1-hexene, (LLDPE), high density polyethylene (HDPE), polypropylene (propylene homopolymer), polypropylene random copolymer, poly 1-butene, poly (ethylene terephthalate), poly (Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.) such as polypropylene, 4-methyl-1-pentene, ethylene propylene random copolymer, ethylene 1-butene random copolymer and propylene 1-butene random copolymer ), Polyamide (nylon-6, nylon-66, polymethoxyl adipamide and the like), polyvinyl chloride, ethylene-vinyl acetate (Meth) acrylic acid copolymer, an ethylene-acrylic acid ester-carbon monoxide copolymer, a polyacronitrile, a polycarbonate, a polystyrene, an ionomer (a copolymer of ethylene and methyl acrylate) a zinc (Zn), sodium (Na), calcium (Ca), ammonium (NH ₄₎ including the part substituted polymers), or can be be selected from the group which is composed of a mixture of two or more of them, more preferably nylon , A polyester, a polyurethane, a polyacrylonitrile, a polyolefin, and a cellulose.

Preferably, the thickness of the electrostatic nonwoven support layer is 0.1 to 10 mm. If the thickness is less than 0.1 mm, it may be difficult to manufacture due to workability problems such as non-uniformity of distance between calender rolls in the non-woven fabric manufacturing step, and if the thickness is more than 10 mm, a problem of workability in the post- .

Preferably, the basis weight of the electrostatic nonwoven supporting layer may be 15 to 300 g / m 2. If the basis weight is less than 15 g / m < 2 >, the problem of stability of the nonwoven fabric structure and the removal rate may decrease. If the basis weight exceeds 300 g / m < 2 >, there is a problem that the removal rate increases but the pressure loss increases. On the other hand, the average fineness of the electrostatic nonwoven fabric supporting layer of the present invention may preferably be 1 to 15 denier. The fibers constituting the electrostatic nonwoven support layer may be short fibers and / or long fibers.

next. The electrostatic separation material layer 310 will be described. The electrostatic filter material layer 310 used in the present invention may be a commonly used electrostatic filter material, and may be a nonwoven fabric, PTFE, glass fiber or the like, but may preferably be a electrostatically processed meltblown nonwoven fabric. The electrostatic treatment method may be electrostatically processed according to the electrostatic treatment method of the electrostatic non-woven fabric support layer described above, and may further include an antistatic agent and an antioxidant. The thickness of the electrostatic filter material layer may be 0.1 to 1 mm, but is not limited thereto. The electrostatic separation material layer 310 may be formed on one surface of the electrostatic nonwoven fabric supporting layer or on both surfaces thereof. The lamination of the electrostatic nonwoven fabric supporting layer and the electrostatic binding material layer is performed by a known bonding method such as hot melt bonding, ultrasonic bonding, chemical bonding, and heat treatment after needle punching, and if necessary, The filter media or the nonwoven fabric may be bonded to form a filter media layer.

On the other hand, the electrostatic treatment timing is advantageous in improving the physical properties when electrostatic treatment is performed after laminating the support layer and the filter media after electrostatic treatment and laminating, respectively, because electrostatic media have lower tensile strength than the support layer, This is because structural deformation by stretching occurs.

The air filter may further comprise an adsorption / deodorization layer selected from the group consisting of activated carbon fibers, carbon nanotubes (CNT), zeolites, silica gels, activated alumina, ion exchange resins, ion exchange fibers, It is within the scope of the present invention that such an adsorption / deodorization layer is added between the meltblown nonwoven fabric of the present invention and the meltblown nonwoven fabric of the present invention.

The air filter of the present invention should satisfy all of the above conditions (1) and (2). The QF index value is an abbreviation of quality factor. It means that it includes the pressure loss and the removal rate expressing the performance of the air filter. The larger the QF value, the better the performance of the filter. If the QF index of the air filter having the same removal efficiency is higher, the pressure loss value is lower, and the higher the QF index value of the air filter having the same pressure loss value, the higher the removal efficiency.

Therefore, the air filter of the present invention should have a collection efficiency of 99.5% or more, preferably 99.9% or more. At the same time, the QF index value should satisfy 2.5 or more, preferably 2.7 or more. As a result, it is possible to improve the collecting efficiency relative to the pressure loss and achieve the energy efficiency of the filter with the same collecting efficiency.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

Poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[(2,2,6,6- Hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]]) (Chimassove 911, Ciba Geiger) 0.5 weight And 0.1 wt% of pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (BASF, Irganox 1010) as an antioxidant) And a spunbond nonwoven fabric was prepared. The prepared spunbonded nonwoven fabric had a basis weight of 70 g / m 2, a thickness of 0.3 mm and an average fineness of 6 denier. Thereafter, a polypropylene meltblown nonwoven fabric having a thickness of 0.25 mm, an average fineness of 1.5 탆 and a basis weight of 30 g / m ² was prepared as a filter medium layer, and a spunbond nonwoven fabric and a meltblown nonwoven fabric were laminated by a hot melt spray method. Thereafter, the electrostatic treatment was carried out by friction contact charging by a water jet method using a high - pressure nozzle to produce an electrostatic nonwoven fabric.

≪ Example 2 >

As a charge control agent, poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[(2,2,6,6- (2,2,6,6-tetramethyl-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) -4-pyrrolidyl) sebacate was used as the initiator, to thereby produce an air filter.

≪ Example 3 >

Instead of pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) as an antioxidant, 2,6-di-tert-butyl- Was used in place of the water-soluble organic solvent, to prepare an air filter.

<Example 4>

Except that bis (2,2,6,6, -tetramethyl-4-pyrylidyl) sebacate was used as an antistatic agent and 2,6-di-tert-butyl-4-methylphenol was used as an antioxidant The air filter was produced in the same manner as in Example 1.

&Lt; Example 5 >

An air filter was produced in the same manner as in Example 1, except that the electrostatic nonwoven fabric supporting layer and the electrostatic filter material were subjected to electrostatic treatment and lapped, respectively.

&Lt; Comparative Example 1 &

An air filter was produced in the same manner as in Example 5, except that a charging agent, an antioxidant, and a nonwoven fabric supporting layer without electrostatic treatment were used.

&Lt; Comparative Example 2 &

An air filter was produced in the same manner as in Example 5, except that a non-woven fabric support layer containing an antistatic agent and an antioxidant and not subjected to electrostatic treatment was used.

&Lt; Comparative Example 3 &

An air filter was produced in the same manner as in Example 1 except that no charging agent was included.

&Lt; Comparative Example 4 &

An air filter was produced in the same manner as in Example 1 except that no antioxidant was included.

&Lt; Comparative Example 5 &

An air filter was produced in the same manner as in Example 5 except that the electrostatic treatment of the meltblown filter material was not performed.

<Experimental Example>

The electrostatic meltblown prepared in the above Examples and Comparative Examples were evaluated as described below, and the results are shown in Table 1.

1. Measurement of collection efficiency and pressure loss

It was measured according to the air filter measurement method generally used. Specifically, an aerosol containing sodium chloride was passed through a nonwoven fabric sample at an air flow rate of 32 LPM (surface wind speed: 5.33 cm / sec), and the sodium chloride concentration before and after the passage was measured to calculate the amount of sodium chloride collected by the nonwoven fabric This was divided by the amount of sodium chloride before passing, and the collection efficiency was measured by percentage. At this time, the aerosol was prepared by dissolving sodium chloride in distilled water to make an aqueous solution of 20% by weight sodium chloride, and then vaporizing moisture by a heater to make sodium chloride to have a size of about 0.3 탆. The collection efficiency (%) of the particles in this manner was measured by an automated efficiency tester (TSI, Model 8130). The pressure loss (mmAq) was measured from the pressure loss before and after passage of the nonwoven sample at an air flow rate of 32 LPM (surface velocity 5.33 cm / s) similar to the collection efficiency measurement method.

2. QF factor measurement (1 / mmH ₂ 0)

The quality factor (QF) is a kind of means for expressing the filter performance combining filtration efficiency and differential pressure, and is generally calculated according to the following relationship. The higher the value, the better the air filter performance.

All.

[Relational expression]

QF index (1 / mmAq) = [- ln ((100 - R) / 100)] /

Where R is the collection efficiency and? P is the differential pressure.

Pressure loss (mmAq) Collection efficiency (%) QF (1 / mmAq) Example 1 2.5 99.97 3.24 Example 2 2.5 99.92 2.85 Example 3 2.5 99.94 2.97 Example 4 2.4 99.75 2.50 Example 5 2.4 99.93 3.03 Comparative Example 1 2.5 99.62 2.23 Comparative Example 2 2.5 99.71 2.34 Comparative Example 3 2.5 99.75 2.40 Comparative Example 4 2.6 99.83 2.45 Comparative Example 5 2.5 43.53 0.23

As can be seen from Table 1, Examples 1 to 5 of the present invention exhibited excellent physical properties as compared with Comparative Examples 1 to 5. Furthermore, Example 1, which was subjected to electrostatic treatment after the lapping process, exhibited excellent physical properties as compared with Example 5 in which the lapping process was performed after electrostatic treatment. Further, Examples 1 and 2 using the specific antistatic agent and the antioxidant of the present invention showed better physical properties than the other examples using different types.

Claims (18)

An electrostatic nonwoven fabric supporting layer comprising an antistatic agent and an antioxidant; And
And an electrostatic binding material layer laminated on at least one side of the electrostatic nonwoven fabric supporting layer, and satisfies the following conditions (1) and (2).
(1) a collection efficiency of at least 99.5% and
(2) a QF index value calculated by the following formula is not less than 2.5
[Relational expression]
QF index (1 / mmAq) = [- ln ((100 - R) / 100)] /
Where R is the collection efficiency and? P is the differential pressure. The method according to claim 1,
Wherein the electrostatic nonwoven fabric supporting layer is a dry nonwoven fabric, a spunlaced nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a needle punch nonwoven fabric, or a stitch bonded nonwoven fabric. The method according to claim 1,
Wherein the electrostatic nonwoven fabric supporting layer comprises one or more fibers selected from the group consisting of nylon, polyester, polyurethane, polyacrylonitrile, polyolefin, and cellulose. The method according to claim 1,
Wherein the thickness of the electrostatic nonwoven supporting layer is 0.1 to 10 mm. The method according to claim 1,
Wherein the charge agent is a hindered amine-based charge agent. 6. The method of claim 5,
The hindered amine-based charge control agent is a poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[ -Tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]. The method according to claim 1,
Wherein the antioxidant is a hindered phenol-based antioxidant. 8. The method of claim 7,
Wherein the antioxidant is pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate). The method according to claim 1,
Wherein the electrostatic nonwoven fabric supporting layer and the electrostatic filter material are electrostatically processed through a corona discharge, a plasma charging, a frictional electrification, or a water electrification method through a high-pressure water droplet. The method according to claim 1,
Wherein the basis weight of the electrostatic nonwoven support layer is 15 to 300 g / m 2. The method according to claim 1,
Wherein the collection efficiency is 99.9% or more and the QF index value is 2.7 or more. (1) A nonwoven fabric supporting layer comprising an antistatic agent and an antioxidant, and an air filter layer formed on at least one surface of the nonwoven fabric supporting layer to form an air filter media;
(2) electrostatically processing the air filter material. 13. The method of claim 12,
Wherein the electrostatic treatment is electrostatically processed through a corona discharge, a plasma charging, a triboelectrification, or a water charging method through a high-pressure water droplet. 13. The method of claim 12,
Wherein the charging agent is a hindered amine-based charging agent. 15. The method of claim 14,
The hindered amine-based charge control agent is a poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [[ -Tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]. 13. The method of claim 12,
Wherein the antioxidant is a hindered phenol-based antioxidant. 17. The method of claim 16,
Wherein the antioxidant is pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 13. The method of claim 12,
Wherein the lumber is performed by ultrasonic bonding, thermal bonding, hot melt bonding, needle punching, water entangling, stitch bonding or adhesive bonding.

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