KR101024091B1 - Spunbond nonwoven fabric and the preparation method thereof - Google Patents

Abstract

The present invention relates to a long fiber spunbond nonwoven fabric and a method of manufacturing the same, and more particularly, to one or both sides of a long fiber spunbond nonwoven fabric having a unit weight of 20 to 300 g / m 2. , Polyvinylidenefluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene, polycarbonate, polymethylmethacrylate, or any of these The present invention relates to a long fiber spunbond nonwoven fabric coated with one or more polymers selected from two or more copolymers and a method of manufacturing the same.

The spunbond nonwoven fabric for air filter according to the present invention has the advantage of excellent filtration efficiency for ionic dust as well as non-ionic dust as the electrostatic performance is improved by coating the polymer which can be electrically charged on one or both sides. There is this.

Air filter, nonwoven fabric, charge treatment

Description

Long fiber spunbond nonwoven fabric and its manufacturing method {SPUNBOND NONWOVEN FABRIC AND THE PREPARATION METHOD THEREOF}

[Industrial use]

The present invention relates to a long fiber spunbond nonwoven fabric for air filters and a method of manufacturing the same.

[Prior art]

In general, spunbond nonwoven fabrics have low pressure loss, excellent bendability and shape stability, and are used as air filters or air filter supports. The spunbond nonwoven fabric is composed of long fibers made of polyester, polyolefin, nylon, etc., and in particular, the polyester spunbond nonwoven fabric is most used for an air filter because of its excellent thermal stability and form stability.

Recently, many studies have been made to improve the filtration efficiency of an air filter, and a method of manufacturing a charged nonwoven fabric by charging a spunbond nonwoven fabric to improve the electrostatic performance of the air filter has been proposed.

However, the nonwoven fabric made of polyester has a disadvantage in that the electrostatic performance deteriorates rapidly with time, even if the charge treatment is performed due to the characteristics of the polyester, and the nonwoven fabric of the nylon material has a high moisture content, which makes it difficult to express the electrostatic performance. .

Accordingly, Korean Patent Laid-Open Publication No. 1998-0063458 discloses a technique for imparting a non-woven fabric to an electrostatic resin solution to impart an electrostatic performance to the nonwoven fabric. That is, the Republic of Korea Patent Publication No. 1998-0063458 discloses a method of manufacturing an electrostatic filter by impregnating an electrostatically charged resin solution on the surface of the electrostatically charged fibrous and then drying and bonding to solidify and mechanical friction treatment. Presented.

However, the method of improving the electrostatic performance by impregnating the electrostatic resin solution in the nonwoven fabric as described above has a disadvantage in that the production process is complicated and the manufacturing cost is high.

An object of the present invention is to provide a spunbond nonwoven fabric having excellent electrostatic performance and excellent filtration efficiency for not only ionic dust but also ionic dust.

Another object of the present invention is to provide a method for producing the spunbond nonwoven fabric in a simplified manner.

Still another object of the present invention is to provide an air filter including the spunbond nonwoven fabric.

In order to achieve the above object, the present invention is polypropylene, polyethylene, polyvinylidene fluoride (polyvinylidene) on one or both sides of the long fiber spunbond nonwoven fabric having a unit weight of 20 ~ 300 g / ㎡ ), Polytetrafluoroethylene, polytrifluoroethylene, polystyrene, polycarbonate, polymethylmethacryate or copolymers of two or more thereof Provided is a long fiber spunbond nonwoven fabric coated with one or more polymers.

According to the present invention, the polymer may be coated with a unit weight of 1 ~ 30 g / ㎡.

In addition, the present invention comprises the steps of preparing a long fiber spunbond nonwoven fabric having a unit weight of 20 ~ 300 g / ㎡; Ii) polypropylene, polyethylene, polyvinylidenefluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene on one or both sides of the nonwoven fabric Coating at least one polymer selected from polycarbonate, polymethylmethacryate or a copolymer of two or more thereof; And iii) it provides a method for producing a long fiber spunbond nonwoven fabric comprising the step of charging the nonwoven fabric.

Hereinafter, the present invention will be described in more detail.

The inventors of the present invention can produce a spunbond nonwoven fabric having excellent electrostatic performance when coating a polymer that can be electrically charged on one or both sides of the spunbond nonwoven fabric in the course of continuing research on a spunbond nonwoven fabric suitable for an air filter. Confirmed that the present invention was completed based on this.

The spunbond nonwoven fabric for air filters according to the present invention is characterized in that a polymer that can be electrically charged on one or both sides of a long fiber spunbond nonwoven fabric having a unit weight of 20 to 300 g / m 2.

That is, when a polymer that can be electrically charged in a discontinuous form is coated on the surface of a nonwoven fabric using a polymer having a different charging sequence, the surface of the nonwoven fabric has a (+) charge due to the unique charging sequence of the polymer. It has a negative charge, and thus the electrostatic performance of the nonwoven fabric is improved, and thus, the filtration efficiency of ionic dust as well as nonionic dust is excellent.

The weight of the spunbond nonwoven fabric according to the present invention may be determined in consideration of filtration efficiency, and may be 20 to 300 g / m 2.

The spunbond nonwoven fabric may include filaments made from one or more resins such as polyester, polyolefine or nylon. As a raw material component of the filament, polyester including polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and polyethylene terephthalate (PET); Polyolefins including polyethylene, and polypropylene; Or nylon or the like may be selected.

At this time, the filament may be composed of the above-described single component, if necessary, in order to facilitate the fixing of the web (web) even at low temperatures when manufacturing the nonwoven fabric as a raw material of the filament two or more different from each other having a melting point difference of 20 ℃ or more Polymers can be used.

In addition, the filament may have an average diameter of 10 ~ 50 ㎛. That is, the average diameter of the filament may be 10 μm or more to prevent an increase in pressure loss of the nonwoven fabric, and may be 50 μm or less for the process stability at the time of filament production and the prevention of nonuniformity of the fiber diameter.

Specifically, the polymer is polypropylene, polyethylene, polyethylene, polyvinylidenefluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene, poly It may be one or more selected from carbonate (polycabonate), polymethylmethacrylate (polymethylmethacryate) or a copolymer of two or more thereof.

In this case, the polymer may be coated with a unit weight of 1 ~ 30 g / ㎡. That is, the polymer may be coated with a unit weight of 1 g / m 2 or more in consideration of the minimum electrostatic performance, and may be coated with 30 g / m 2 or less in consideration of the increase in the electrostatic performance and the pressure loss.

In addition, the spunbond nonwoven fabric according to the present invention is charged to further improve the filtration efficiency for ionic dust.

On the other hand, the present invention provides a method for producing the long fiber spunbond nonwoven fabric.

Method for producing a spunbond nonwoven fabric according to the present invention includes the steps of: i) preparing a long fiber spunbond nonwoven fabric having a unit weight of 20 to 300 g / m 2; Ii) polypropylene, polyethylene, polyvinylidenefluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene on one or both sides of the nonwoven fabric Coating at least one polymer selected from polycarbonate, polymethylmethacryate or a copolymer of two or more thereof; And iii) charging the nonwoven fabric.

The step iii) is a step of preparing a long fiber spunbond nonwoven fabric having a unit weight of 20 to 300 g / m 2, which may be manufactured directly or purchased and used.

When preparing and preparing a spunbond nonwoven fabric directly, the step iii) includes: a) spinning a filament having an average diameter of 10 to 50 µm; b) laminating the filaments to laminate a web; And c) fixing the web to produce a nonwoven fabric.

Step a) is a step of spinning the filament which is a component of the spunbond nonwoven fabric, using the raw material resin as described above to adjust the discharge amount and the number of capillaries of the cap such that the average diameter of the filament is 10 ~ 50 ㎛, It can be stretched sufficiently to have a spinning speed of 4,500 to 5,500 m / min.

Step b) may be performed by a conventional method of laminating the filaments in a web form on a net conveyor continuously moving in a conventional opening method.

The method of fixing the web in step c) may use a conventional method known in the art (hereinafter referred to as 'the art') to which the present invention belongs. Specifically, as a method of fixing the laminated web, a thermal bonding method, a resin bonding method, a needle punching method, a water punching method, a stitch bonding method, or the like can be used, and among them, a thermal bonding method is best used.

Subsequently, the manufacturing method according to the present invention is ii) coating the polymer on one or both surfaces of the nonwoven fabric.

The method of coating the polymer on the nonwoven fabric in step ii) may use a conventional method known in the art, and spray coating the polymer as described above using a slot coating nozzle. Coating by the method.

In this case, the polymer may be coated with a unit weight of 1 ~ 30 g / ㎡, may be such that the weight of the nonwoven fabric is 20 ~ 300 g / ㎡.

Subsequently, iii) the nonwoven fabric is charged.

The step iii) is a step of polarizing by charging the nonwoven fabric, and the charging treatment method is not particularly limited since it may be performed by a conventional method known in the art. At this time, the conditions of the charge treatment can be determined in consideration of the polarization efficiency, it can be carried out to be 15 to 25 KV / cm for the nonwoven fabric.

On the other hand, the present invention provides an air filter comprising the spunbond nonwoven fabric.

Air filter according to the present invention includes the spunbond nonwoven fabric, the filtration efficiency (particle 0.3 ㎛, air volume 300 m 3 / h) 40 to 70%, and the pressure loss (air volume 300 m 3 / h, filter area 0.6㎡) 15 to It has the advantage of having a physical property of 20 Pa.

Hereinafter, preferred examples and comparative examples are presented to aid in understanding the present invention. However, the following examples are intended to illustrate the present invention without limiting it thereto.

Example  One

(Non-woven fabric preparation stage)

A long fiber spunbond nonwoven fabric having a unit weight of 90 g / m 2 and containing a filament of a PET material having an average diameter of 30 μm was prepared (manufacturer: Kolon Co., Ltd., product name: F5090SW).

(Polymer coating and charge treatment step that can be electrically charged)

One side of the spunbond nonwoven fabric was spray-coated with a polyethylene-based copolymer having a softening temperature of about 85 ° C. composed of polyethylene and polymethyl methacrylate using a slot coating nozzle. The nonwoven fabric was then charged to a field strength of 20 KV / cm to produce the final spunbond nonwoven fabric.

Example  2

(Nonwoven Fabric Preparation Step)

It was carried out in the same manner as in Example 1.

(Coating and charging process of polymer which can be electrically charged)

An electrically charged polymer was carried out in the same manner as in Example 1, except that 4 g / m 2 was coated on each side of the spunbond nonwoven fabric.

Comparative example  One

(Nonwoven Fabric Preparation Step)

It was carried out in the same manner as in Example 1.

(Coating and charging process of polymer which can be electrically charged)

The same procedure as in Example 1 was carried out except that the polymer was not coated on a spunbond nonwoven fabric.

Experimental Example  (Property measurement)

Filtration efficiency and pressure loss were measured for the spunbonded nonwoven fabric prepared in Examples and Comparative Examples as follows, and the results are shown in Table 1 below.

1) Filtration efficiency (%)

The filtration efficiency is expressed as a percentage (%) of the contaminants removed by the air filter at the prescribed air flow rate (air flow rate 300 m 3 / h) as shown in the following formula, and the measuring equipment is referred to as "Test system for Cabin Air Filter Unit" ( Manufacturer: Topas Gmbh) was used, and the dust "ISO 12103-1 A2 fine test dust" (particle size 0.3 ㎛) was used. The sample was bent under filter condition and the filter area was 0.6㎡ (mount height 28mm, slit width 250mm).

[formula]

Filtration Efficiency (%) = {(C1-C2) / C1} × 100

In the above formula, C1 is the dust inlet concentration at the inlet side, and C2 is the dust exhaust concentration at the outlet side.

2) Pressure loss Pa )

The pressure loss represents the static pressure difference (Pa) between the inlet and outlet sides of the air filter at the specified air flow rate (air flow rate 300 m3 / h), and the measuring equipment is referred to as "Test system for Cabin Air Filter Unit" (manufacturer: Topas Gmbh). Use) The sample was bent under filter condition and the filter area was 0.6m2 (mountain height 28mm, slit width 250mm).

division Example 1 Example 2 Comparative Example 1 Configuration Nonwoven Weight (g / ㎡) 90 90 90 Chargeable Polymer
Coating amount (g / ㎡) surface 8 4 - Back side - 4 - effect Filtration Efficiency (%), 0.3㎛ 44 53 12 Pressure loss (Pa) 20 17 15

As shown in Table 1, Examples 1 and 2 were coated with a polymer that can be electrically charged on one or both sides of the nonwoven fabric, it was shown that the filtration efficiency compared to the non-coated Comparative Example 1. In particular, Example 2 in which the polymer that can be electrically charged on both sides of the nonwoven fabric was found to further improve the filtration efficiency compared to Example 1 in which the same amount was coated only on the surface.

As described above, the spunbonded nonwoven fabric for air filters according to the present invention includes an electrically charged polymer coated on one or both surfaces, thereby improving electrostatic performance and filtering not only ionic dust but also ionic dust. The efficiency is excellent.

Claims (8)

On one or both sides of a long fiber spunbond nonwoven fabric having a unit weight of 20 to 300 g / m2 Polypropylene, polyethylene, polyvinylidenefluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene, polycarbonate, polycabonate, poly A long fiber spunbond nonwoven fabric coated with one or more polymers selected from methyl methacrylate (polymethylmethacryate) or a copolymer of two or more thereof. The method of claim 1, The polymer is a long fiber spunbond nonwoven fabric that is coated with a unit weight of 1 ~ 30 g / ㎡. The method of claim 1, The spunbond nonwoven fabric is a long fiber spunbond nonwoven fabric comprising a filament made from at least one resin selected from polyester (polyester), polyolefin (polyolefine) or nylon (nylon). Iii) preparing a long fiber spunbond nonwoven fabric having a unit weight of 20-300 g / m 2; Ii) polypropylene, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polytrifluoroethylene, polystyrene on one or both sides of the nonwoven fabric coating at least one polymer selected from polystyrene, polycarbonate, polymethylmethacryate or a copolymer of two or more thereof; And Iii) charging the nonwoven fabric Method for producing a long fiber spunbond nonwoven fabric comprising a. The method of claim 4, wherein The step ii) is a method for producing a long fiber spunbond nonwoven fabric which is electrically charged polymer coating a unit weight of 1 ~ 30 g / ㎡. The method of claim 4, wherein The charging process of step iii) is 15 to 25 KV / cm of the long fiber spunbond nonwoven fabric manufacturing method. An air filter comprising the spunbond nonwoven fabric of any one of claims 1 to 3. The method of claim 7, wherein The air filter is an air filter having a physical property of 40 to 70% filtration efficiency (particle 0.3 ㎛, air volume 300 m 3 / h).