KR20190097426A - Multi layered filter for removing dust, system and manufacturing method for the same - Google Patents

Abstract

The present invention relates to a filter for dust collection, which comprises a first filter layer; and a second filter layer made of nanofibers having finer pores than the first filter layer. A bi-component base material and an adhesive agent are sequentially laminated between the first filter layer and the second filter layer. The second filter layer is a polyvinylidene fluoride, polyurethane, polyether sulfone, or polyamide nanofiber nonwoven fabric laminated by electrospinning a polyvinylidene fluoride, polyurethane, polyether sulfone, or polyamide solution.

Description

Multi layered filter for removing dust, system and manufacturing method for the same

The present invention relates to a multi-layered dust collecting filter and a method for manufacturing the same, by providing a second filter layer in which nanofibers are applied by electrospinning on the first filter layer having a porous structure, the filtration efficiency is greatly improved and the service life is increased. At the same time, the present invention relates to a multi-layer dust collecting filter, a system, and a method of manufacturing the same, which can reduce operating pressure by reducing a differential pressure.

A filter is a filtration device that filters foreign substances in a fluid and is classified into a liquid filter and an air filter.

Among these, air filters are used in semiconductor manufacturing, computer equipment assembly, hospitals, etc. to remove biologically harmful substances such as microparticles such as dust in the air, bioparticles such as bacteria and molds, and bacteria to prevent defects of high-tech products with the development of high-tech industries. It is used in food processing factories, agriculture, forestry and fisheries, and is widely used in the field of preventing dust from being emitted to the atmosphere, such as dusty workplaces and thermal power plants.

Fine dust among the materials targeted by the filter refers to suspended matter having a particle diameter of 10 μm or less that floats in the air. It is considered as one of the major air pollutants along with sulfurous acid gas, nitrogen oxides, lead and carbon monoxide. Recently, the reduction of fine dust emission has emerged as a major environmental issue in Korea. Since fine dust is known to occur mainly in the combustion process of fossil fuels such as power plants, factories and automobiles, dust collecting facilities for suppressing fine dust emissions are essential in fossil fuels such as thermal power plants and steel mills. In addition, the fine dust generated in industrial facilities that contain a lot of grinding process should be discharged after the dust collection equipment.

In order to achieve the optimum efficiency in the dust collecting system, various factors such as dust collection efficiency, dust detachability, low differential pressure, blower power saving, and long service life should be considered.

In this regard, Korean Patent Laid-Open Publication No. 10-2013-0075514 discloses a filter coated with a fluororesin-containing coating liquid as an asymmetric porous sheet. However, there are process shortcomings in terms of improving the functions and effects of the key sheets in the multilayer filter with a separate coating solution.

Accordingly, a problem to be solved by the present invention is to provide a dust collecting filter and a method for manufacturing the same, in which filter characteristics such as dust collecting efficiency are improved without using a separate coating liquid or the like.

In order to solve the above problems, the present invention is a filter for dust collection, the first filter layer; A second filter layer made of nanofibers having fine pores than the first filter layer, and comprising a two-component substrate between the first filter layer and the second filter layer; And an adhesive is sequentially laminated, and the second filter layer is polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide formed by electrospinning polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide solution. Provided is a filter for dust collection, characterized in that the nanofiber nonwoven fabric.

In one embodiment of the present invention, the second filter has a fiber diameter of 50 to 1000nm, the fiber diameter of the first filter has a diameter of 10 to 50 μm, the adhesive has a weight of 5gsm to 20gsm, melting point (℃) , DSC) 80 to 180 degrees Celsius, 80 to 500 Pa.s.

In one embodiment of the present invention, the bicomponent substrate is a sheath-core type, Side by side, and C type (C-type), in the sheath-core bicomponent substrate The sheath portion is low melting polyethylene and the core portion is high melting polyester.

In one embodiment of the present invention, the second filter layer is applied by electrospinning vertically in the direction of the first filter layer.

In one embodiment of the invention, the first filter layer comprises a polyester.

In one embodiment of the present invention, the basis weight of the bicomponent substrate of the first filter layer is 10 to 50g / m, the basis weight of the polyester substrate is 150 to 600g / m2, the filter for dust collection.

The present invention also provides a method for manufacturing a filter for dust collection, comprising: stacking the second filter layer on the two-component substrate (S100); And thermally compressing the first filter layer and the second filter layer with the adhesive interposed therebetween (S200), wherein the adhesive is contacted and bonded to each other in the process of thermocompressing with the bicomponent substrate, and the thermocompression bonding is performed. The silver filter proceeds at a temperature of 80 to 180 degrees Celsius, the second filter has a fiber diameter of 50 to 1000 nm, the fiber diameter of the first filter has a diameter of 10 to 50 μm, the adhesive weight 5gsm to 20gsm, melting It provides a method for producing a filter for dust collection, characterized in that it has a viscosity (Pa. S 180 ° C.) at a point (° C., DSC) of 80 to 180 degrees Celsius and 80 to 500 Pa.s.

According to the present invention, the filter material polymer material is applied onto the first filter layer by an electrospinning method without a separate surface treatment. In particular, polymer fibers having a thickness of several tens to hundreds of nm are electrospun in a vertical manner to form nanofibers for the purpose of filter in a uniform form, thereby greatly improving porosity and durability. Therefore, the fine dust removal performance and the filtration efficiency is excellent, the life is also long, it can be expected to reduce the operating cost requirements due to high air permeability and low differential pressure.

1 is a view showing a cross-sectional structure of a composite multilayer filter according to an embodiment of the present invention.
2 is a step diagram of a filter manufacturing method according to an embodiment of the present invention.

The following merely illustrates the principles of the invention. Those skilled in the art, although not explicitly described or illustrated herein, may embody the principles of the present invention and invent various devices that fall within the spirit and scope of the present invention. In addition, all conditional terms and embodiments listed herein are in principle clearly intended to be understood only for the purpose of understanding the concept of the invention and are not to be limited to the specifically listed embodiments and states. do.

In addition, it is to be understood that all detailed descriptions, including the specific embodiments, as well as the principles, aspects, and embodiments of the present invention, are intended to include structural and functional equivalents thereof. In addition, these equivalents should be understood to include not only equivalents now known, but also equivalents to be developed in the future, that is, all devices invented to perform the same function regardless of structure.

The present invention provides a filter for dust collection, comprising: a first filter layer; It provides a composite multilayer filter layer of a structure consisting of a second filter layer made of nanofibers having fine pores than the first filter layer.

1 is a view showing a cross-sectional structure of a composite multilayer filter according to an embodiment of the present invention.

Referring to FIG. 1, a filter according to an embodiment of the present invention may include a two-component substrate 110 between a first filter layer 100 and a second filter layer 200; And adhesive 120 is sequentially laminated, and the second filter layer is polyvinylidene fluoride or polyurethane or polyether sulfone formed by electrospinning polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide solution. Or polyamide nanofiber nonwovens.

In one embodiment of the present invention, the second filter has a fiber diameter of 50 to 1000nm, the fiber diameter of the first filter has a diameter of 10 ~ 50 μm.

In particular, in the present invention, the bonding between the second filter layer of the micropores and the first filter layer is very important under high pressure conditions, and there is a problem that the liquid adhesive (urethane adhesive, acrylic adhesive) is not suitable for the microporous adhesive. To this end, the present invention uses an adhesive in the form of a sheet that does not exhibit viscosity characteristics at room temperature. In one embodiment of the present invention, the adhesive has a weight of 5 gsm to 20 gsm, a melting point (° C, DSC) of 80 to 180 degrees Celsius, 80 To a viscosity of 500 Pa · s (Pa. S180 ° C.).

In particular, the first filter layer has relatively wide pores, and the bicomponent substrate is a sheath-core, a side by side, and a C-type, and the sheath In the cored bicomponent substrate the sheath portion is low melting polyethylene and the core portion is high melting polyester. In the case of side by side type two-component base materials, one side is low melting point polyethylene and the other side is high melting point polyester. Surrounding the seed type is low melting polyethylene and high melting polyester inside.

In an embodiment of the present invention, the basis weight of the bicomponent substrate of the first filter layer is 10 to 50 g / m, and the basis weight of the polyester substrate is 150 to 600 g / m 2.

According to the present invention, in particular, when the nanofiber nonwoven fabric is vertically electrospun, a uniform and uniformly spaced filter can be obtained. Particularly, the hydrophobic second filter with excellent filtration efficiency can be obtained through the difference in the gap between the first filter and the second filter. There is an advantage that it is easier to remove the dust collected through use.

In one embodiment of the present invention, the second filter in the form of a nanofiber nonwoven fabric including polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide has a fiber diameter of 50 nm to 1000 nm, and the first filter has a diameter of 10 to 50 nm. It is desirable to have a diameter on the order of microns.

2 is a step diagram of the above-described filter manufacturing method according to an embodiment of the present invention.

Referring to FIG. 2, in the method for manufacturing a filter for dust collection, two filter layers of fine pores are vertically electrospun and stacked on a two-component substrate (S100). Thereafter, the first filter layer and the second filter layer are thermocompressed with an adhesive and the bicomponent substrate therebetween, whereby the adhesive is contacted and bonded to each other in the process of thermocompression bonding with the bicomponent substrate. In one embodiment of the present invention, the thermal compression is carried out at a temperature of 80 to 180 degrees Celsius, the adhesive in the temperature range is to have a constant viscosity to be in contact with the substrate front surface.

In an embodiment of the present invention, the second filter has a fiber diameter of 50 to 1000 nm, the fiber diameter of the first filter has a diameter of 10 to 50 μm, and the adhesive has a weight of 5 gsm to 20 gsm and a melting point (° C., DSC) It is desirable to have a viscosity of 80 to 180 degrees Celsius, 80 to 500 Pa.s (Pa.s180 ° C), in order to maintain the conditions which do not prevent the pore of the microstructured filter as described above. .

Experimental Example 1

Filtration efficiency according to the diameter of the first filter layer and the second filter layer

In the present experimental example, the differential pressure was measured according to the fiber diameter of the first filter layer and the second filter layer in the multi-structured filter.

First filter layer (μm) Second filter layer (nm) Differential pressure (mmAq, after 30 days) Dust removal performance (mg / ㎥) 50 50 32.2 0.25 50 100 33.3 0.078 50 1000 31.6 0.079 50 1500 42.3 0.28

Referring to the results, it can be seen that the dust removal performance and the differential pressure, which is the filter performance, vary according to the diameter of the second filter layer. In particular, it can be seen that the differential pressure and the dust removal performance are very excellent in the second filter diameter in the range of 100 to 1000 nm.

Experimental Example 2

Adhesive force according to the first filter layer thickness

In the present experimental example, it was demonstrated that the adhesive force between the first filter layer and the second filter layer obtained by being bonded through the heterogeneous substrate and the adhesive varies depending on the fiber diameter of the first filter layer. In the following experiment, the adhesion between the first filter and the second filter was measured through a peel test. After washing the filter five times, it was measured whether the first filter layer and the second filter layer were peeled off.

First filter layer (μm) Second filter layer (nm) Peeling 10 500 O 20 500 X 100 500 X 150 500 △

Referring to the above results, when the first filter layer is smaller than 10 μm, the heterogeneous substrate may not be sufficiently absorbed to the inside, and thus the entire filter layer may not function as an adhesive area. It can be seen that the decrease. Therefore, the adhesive should be supported in a sufficient amount on the opposite substrate corresponding to the pores of the first filter layer, it can be seen that the second filter layer is bonded to the opposite substrate on the first filter layer with sufficient force through the adhesive during thermocompression bonding.

Experimental Example 3

Filter differential pressure according to the viscosity of the adhesive layer

In the present experimental example, a polyester-based adhesive having a viscosity at room temperature and a polyester-based adhesive having a viscosity at room temperature but having a viscosity of 100 weeks at 180 degrees Celsius are compared. The conditions of the filter layer were the same as in Experimental Example 1.

glue Filter differential pressure (mmH2O) Liquid adhesive 45 Sheet adhesive 16

Referring to the above results, it can be seen that when the adhesive adhesive is used, the adhesive blocks the fine pores of the second filter layer formed by nanospinning, thereby increasing the differential pressure of the filter.

Claims (7)

As a filter for dust collection,
A first filter layer;
It consists of a second filter layer made of nanofibers having fine pores than the first filter layer,
A two-component substrate between the first filter layer and the second filter layer; And the adhesive are sequentially stacked,
The second filter layer is polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide nanofiber nonwoven fabric formed by electrospinning polyvinylidene fluoride or polyurethane or polyether sulfone or polyamide solution. Dust collector filter. The method of claim 1,
The second filter has a fiber diameter of 50 to 1000 nm, the fiber diameter of the first filter has a diameter of 10 to 50 μm, the adhesive has a weight of 5gsm to 20gsm, melting point (℃, DSC) 80 to 180 degrees Celsius , Dust collection filter having a viscosity of 80 to 500 Pa.s (Pa.s180 ℃). The method of claim 1,
The bicomponent substrate is Sheath-Core, Side by side and C-type, In the cis-core bicomponent substrate, the sheath portion is low melting point polyethylene, The core part is a dust collecting filter, characterized in that the high-melting point polyester. The method of claim 1,
And the second filter layer is electrospun and applied vertically in the direction of the first filter layer. The method of claim 1,
Dust collecting filter, characterized in that the first filter layer comprises a polyester. The method of claim 3, wherein
The basis weight of the bicomponent base material of the said 1st filter layer is 10-50 g / m, and the basis weight of the said polyester base material is 150-600 g / m <2>, The filter for dust collection characterized by the above-mentioned. According to any one of claims 1 to 6 dust collecting filter manufacturing method,
Stacking the second filter layer on the bicomponent substrate (S100);
And thermally compressing the first filter layer and the second filter layer with the adhesive interposed therebetween (S200), wherein the adhesive is contacted and bonded to each other in the process of thermocompressing with the bicomponent substrate, and the thermocompression bonding is performed. Proceeds at a temperature of 80 to 180 degrees Celsius,
The second filter has a fiber diameter of 50 to 1000 nm, the fiber diameter of the first filter has a diameter of 10 to 50 μm, the adhesive has a weight of 5gsm to 20gsm, melting point (℃, DSC) 80 to 180 degrees Celsius , 80 to 500 Pa.s having a viscosity (Pa.s 180 ℃) characterized in that the filter manufacturing method for dust collection.

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