WO2019132139A1 - Method for manufacturing air-circulating type fine dust proof mesh using nano-fiber - Google Patents

Abstract

According to the problem to be solved by the present invention, a method for manufacturing a fine dust proof mesh using a nano-fiber coats a mesh to which a nano-fiber is bonded, with a resin by using a special method so as to prevent detachment and damage of the nano-fiber and remarkably reduce a thickness and a weight of a mesh in comparison with an existing product, and enables manufacturing of a fine dust proof mesh having excellent visibility and air permeability.

Description

Manufacturing Method of Air Circulation Type Fine Dust Dustproof Mesh Using Nanofibers

The present invention relates to a dustproof mesh manufacturing method, and more particularly, to a dustproof mesh manufacturing method capable of blocking fine dust and preventing damage of nanofibers due to external friction or impact.

In general, mesh-type textile products are used to fix various kinds of mesh products to window frames or to use roll screens in order to prevent insects such as worms. These products can not prevent fine dust, which is a serious environmental problem in recent years.

It is possible to use nonwoven fabric such as meltblown in dustproof mesh for blocking fine dust, but it is difficult to block ultrafine dusts of PM (Particulate Meter) 2.5 or less. In addition, in order to be installed on a window, the visibility to the outside of the window must be ensured, so that the conventional filter nonwoven fabric is not suitable. This visibility problem can be overcome by applying a layer of nanofiber, which is not a nonwoven fabric, onto the mesh.

However, nanofibers are produced mainly by electrospinning with fibers having a diameter of several tens to several hundreds of nanometers. When nanofibers are applied on a mesh, they are not attached to the mesh, have.

In addition, since the nanofiber is physically weak in strength, the nanofiber is easily damaged by external impact or friction, thereby deteriorating the performance of the product. That is, due to the weak durability, the nanofiber coating mesh has a problem that it is difficult to use in a place where external force frequently acts.

In some manufacturers, a thin mesh product is laminated on the nanofiber to solve the durability problem of the nanofiber, but this manufacturing method increases the thickness and weight of the product and increases the cost of the raw material. In addition, Nanofibers are likely to be damaged. Also, the mesh-lined product can not be free from the problem of deteriorating the appearance of the product and deteriorating the nanofiber protection function when the protective mesh is partially peeled off during long-term use.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a nanofiber coating method and a nanofiber coating method, in which a nanofiber is separated from a mesh in a manufacturing process by using a two-step coating method in which a coating resin is first transferred onto a backing paper, And to provide a method of manufacturing an air circulation type micro dust-proofing mesh using nanofibers, which can minimize the damage of the air-circulation type micro dust-proofing mesh.

Another problem to be solved by the present invention is to provide a nano-fiber-reinforced resin composition which can prevent peeling and damage of nanofibers during use by directly coating an adhesive resin on the nanofibers, And to provide a method for manufacturing a circulating fine dust-proofing mesh.

Another object of the present invention is to provide a nanofiber which is coated with a coating resin of a continuous pattern pattern on a nanofiber in a cover factor of 35% to 70% And to provide a method of manufacturing an air circulation type fine dust dustproofing mesh.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided an electrospinning method for fabricating a mesh by spinning nanofibers having a diameter of 500 nm to 700 nm with a mesh having a mesh size of 1 mm to 5 mm at 2 g / m ² to 5 g / m ² . The release paper is passed through a first roller for resin transfer so that a coating resin mixed with an adhesive of the first component and an adhesive of the second component is applied in a continuous pattern pattern of 1.5 g / m ² to 3.5 g / m ² Wherein the adhesive of the first component has a greater tendency to contribute to the improvement in flexibility and adhesiveness of the coating resin as compared with the adhesive of the second component, The method comprising the steps of: preparing a processed release paper, which has a greater tendency to contribute to improvement in durability and strength of the coating resin as compared with an adhesive; The nanofiber radiating surface of the processed mesh and the coated resin transfer surface of the processed release paper were put in contact with each other and passed through a second roller heated to 90 to 100 ° C under a pressure of 0.4 MPa to 0.8 MPa, ; And removing the release paper from the release paper bonding mesh to produce a dustproof mesh having a cover factor of 35% to 70% of the coating resin.

The coating resin may be a coating resin in which the ethylene-vinyl acetate adhesive as the adhesive for the first component and the polyurethane adhesive as the adhesive for the second component are mixed in the range of 80:20 to 60:40.

The dustproof mesh manufacturing method may further include aging the release paper bonding mesh at 40 ° C to 50 ° C for 10 hours to 24 hours before the release paper removing step.

Wherein the electrospinning step comprises spinning the nanofibers through the mesh using a top-down electrospinning device, and alternately spinning the adhesive and the nanofibers a plurality of times to form a nanofiber layer on the top layer, Or a mixture of a 10% to 20% concentration nanofiber polymer solution with a polyurethane adhesive or an acrylic adhesive.

The pressure applied to the first roller may be 0.2 MPa to 0.4 MPa.

The dustproof mesh, the performance of the ASHRAE STANDARD 52.1, and the dust collection efficiency is 80% or more in accordance with gravimetric method JIS L 1096 2010, an air permeability according to Method A are 150cm ³ / cm ² / s to about 170cm ³ / cm ² / s Lt; / RTI >

According to the method of manufacturing an air circulation type micro dust-proofing mesh using nanofibers according to the present invention, since a coating resin is first transferred to a back sheet and a coating resin on the back sheet is coated on the nanofibers, The effect of separating the fibers from the mesh or minimizing the damage of the nanofibers can be provided.

The dust-proof mesh fabricated according to the method of manufacturing an air circulation type dust-free dust-proofing mesh using nanofibers according to the present invention can prevent the nanofibers from being separated from the mesh during use by directly adhering the nanofibers to the mesh, It has excellent advantages.

The dustproof mesh fabricated according to the method of manufacturing an air circulation type fine dust dustproofing mesh using nanofibers according to the present invention is formed by coating a coating resin of a continuous pattern pattern on a nanofiber with a cover factor of 35% to 70% Which is superior to the dust-proof mesh of FIG.

FIG. 1 is a flowchart illustrating an example of a method for fabricating a fine dust-damping mesh using nanofibers according to a first embodiment of the present invention.

2 is a conceptual diagram of an electrospinning device for performing electrospinning of nanofibers and an adhesive in the method of manufacturing a fine dust-proofing mesh using the nanofibers shown in FIG.

3A is a conceptual diagram showing an example of the structure of a radiation part of an electrospinning device used in a method of manufacturing a fine dust-proofing mesh using nanofibers according to the present invention.

Figs. 3B and 3C are enlarged photographs for comparing the adhesive electrospinning result in the electrospinning step according to the present invention with the results of the conventional adhesive spray application. Fig.

4 is a conceptual view showing an example of a resin coating apparatus for performing resin coating in a method of manufacturing a fine dust-damping mesh using nanofibers according to the present invention.

FIG. 5 conceptually shows examples of a pattern engraved on the surface of a first roller for transferring a continuous pattern to a release paper in a resin coating apparatus used in a method of manufacturing a fine dust dustproof mesh using nanofibers according to the present invention.

FIG. 6A shows that the pressure applied to the second roller for adhesion of the coating resin in Comparative Example 2 of the present invention is excessive, so that the nanofibers are damaged or peeled off from the mesh.

6B is a photograph for comparing washing durability of Example 2 according to the present invention and Comparative Example 2 thereof.

7 shows the result of the fine dust collecting efficiency test of the dustproof mesh example 2 according to the present invention.

8A shows a test result of the dustproof mesh embodiment 2 according to the present invention.

FIG. 8B shows a test result of a third party in order to compare the dustproof mesh according to the second embodiment of the present invention with other mass-produced products.

9A to 9D show the visibility test results of the dustproof mesh embodiment 2 according to the present invention.

10 is a graph showing a pore size distribution test result of the dustproof mesh example 2 according to the present invention.

11A and 11B show test results of the pollen blocking efficiency of the dustproof mesh example 2 according to the present invention.

Figure 12 shows actual photographs of the dustproof mesh fabricated according to the present invention.

For a better understanding of the present invention, its operational advantages and features, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which form a preferred embodiment of the invention, and the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

FIG. 1 is a flowchart illustrating an example of a method for fabricating a fine dust-damping mesh using nanofibers according to a first embodiment of the present invention. FIG. 2 is a conceptual diagram of a top-down electrospinning device 100 for performing electrospinning of nanofibers in a method of manufacturing an air circulation type fine dust-proofing mesh using nanofibers according to the present invention. 3 is a conceptual diagram showing an example of the structure of the radiation part 120 of the electrospinning device 100 used in the method of manufacturing the air circulation type fine dust dustproof mesh using the nanofibers according to the present invention. FIG. 4 is a conceptual diagram showing an example of a resin coating apparatus 200 for performing resin coating in a method of manufacturing a fine dust-damping mesh using nanofibers according to the present invention.

First, a processed mesh is prepared by spinning nanofibers on a grid-like mesh using an electrospinning apparatus (S100). Here, the diameter of the nanofiber is 500 nm to 700 nm, the diameter of the lattice is 1 mm to 5 mm, and the nanofiber is preferably radiated at ² g / m ² to 5 g / m ² .

Nanofibers having diameters ranging from 200 nm to 1000 nm are generally used for the manufacture of dust-proof meshes. In the present invention, nanofibers having a diameter of at least 500 nm are used, whereby the nanofibers themselves have a certain strength, During the process, the amount of nanofibers passing through the mesh is reduced, which is also helpful for uniform nanofiber application.

Meanwhile, in the present invention, nanofibers having a diameter of 700 nm or less are used because, when nanofibers having a diameter of 700 nm or more are used, fine pores between the nanofibers are increased and the fine dust collecting efficiency can be reduced. The mesh may be one of PVC, PVC coated glass fiber, PP, PET, and Nylon having a thickness of 0.1 mm to 1 mm, and the nanofiber may be one of PVDF, TPU, PAN, PET, and Nylon.

According to the present invention, due to the limitation of the diameter of the nanofibers, the dust collection efficiency of 80% or more according to the ASHRAE STANDARD 52.1 can be achieved even when the dustproof mesh is manufactured using the mesh having a lattice diameter of 1 mm to 5 mm, 1096 2010, according to the method A, 150 cm ³ / cm ² / s to 170 cm ³ / cm ² / s.

Referring to FIG. 2, the electrospinning step S100 may be performed by the top-down electrospinning apparatus 100. FIG.

The electrospinning device 100 includes a reservoir 110 for storing a nanofiber polymer solution, a radiation unit 120 for emitting a nanofiber polymer solution, and a collector 130 in which a mesh is disposed. A high voltage is applied between the radiation unit 120 and the collector 130.

The storage tank 110 may be equipped with a stirring device including a motor M for stirring the nanofiber polymer solution and a propeller. The nanofiber polymer solution stored in the reservoir 110 is pumped by the pump P and radiated to the mesh on the collector 130 through the spinning nozzle 121 of the radiation unit 120, The compressed air is injected. Then, nanofibers are radiated onto the mesh located on the collector 130 to form a layer. Meanwhile, the electrospinning apparatus 100 is preferably a system in which temperature and humidity of air are kept constant. This is to control the resin hardening speed in the pipe or injection nozzle due to the inflow of external air.

Referring to FIG. 3, the radiation unit 120 of the electrospinning apparatus 100 of FIG. 2 may have a structure in which the nanofiber radiation module and the adhesive radiation module are alternately disposed along the traveling direction of the mesh. Each of the radiation modules may have a structure in which a plurality of single radiation portions are continuously disposed to cover the entire width of the mesh.

According to the structure of the radiation unit 120, the nanofibers are radiated onto the mesh during the movement of the mesh on the collector, and then the adhesive and the nanofiber irradiation are alternately repeated a plurality of times, and the nanofiber layer is radiated on the uppermost layer. The adhesive may be an adhesive in which a solution of a nanofiber polymer solution having a concentration of 10% to 20% is mixed with a polyurethane or acrylic adhesive at a predetermined ratio. The predetermined ratio may be a ratio of 0.5: 1 to 1.5: 1.

The reason for mixing the nanofiber polymer solution into the polyurethane or acrylic adhesive during the manufacture of the adhesive is that since the adhesive itself is difficult to be fibrous, the adhesive is fibrous when the adhesive is spun by mixing the nanofibers, So that the nanofibers can be uniformly applied. The process of first performing nanofiber spinning also firstly forms a nanofiber layer on the mesh to prevent the adhesive from escaping under the mesh through the mesh lattice, thus helping to uniformly apply the nanofibers.

The single radiating part may have a structure including a spinning nozzle and an air jet opening like the radiating part 120 shown in Fig. On the other hand, the number of single radiating parts in each radiation module may vary depending on the width of the mesh. For example, the number of single radiating parts may be between a few tens and several hundreds depending on the width of the mesh.

As described above with reference to FIG. 3A, in the present invention, not only the nanofibers but also the adhesive are applied on the mesh through electrospinning in the electrospinning step. According to this method, compared with the conventional adhesive spray application method, Adhesion can be much higher.

Figs. 3B and 3C are enlarged photographs for comparing the adhesive electrospinning result in the electrospinning step according to the present invention with the results of the conventional adhesive spray application. Fig. In FIG. 3A, light brown lines represent nanofibers, black lines represent an adhesive, and black in FIG. 3B represents an adhesive agent at the irregularly agglomerated portion, although it is not visually distinguished by reference.

Referring to FIGS. 3B and 3C, it can be seen that the adhesive electrospun according to the electrospinning of the present invention has a very small diameter and uniformity, and the adhesive mass is also small in size and shaped like a sphere. It can be seen that the diameter of the adhesive is non-uniform and the size of the adhesive mass is very large. According to the present invention, when the nanofibers are spun as well as the nanofibers in the spinning step according to the present invention, adhesion between the nanofibers is more uniform and stronger than that of applying the conventional adhesive by spraying have.

1, a method of manufacturing a dustproof mesh according to the present invention is a method in which a release paper is passed through a first roller 210 for transferring resin to form a coating resin (ex: ethylene-vinyl acetate- the adhesive and the polyurethane-based adhesive is 80: 20 to 60: 40 of the coated resin mixture in the range) to each other is connected to the continuous patterns 1.5g / m ² to 3.5g / m ² was transferred to the release paper to produce a release paper processing (S110).

In the present invention, not the coating resin but the adhesive resin are mixed and used as the nano-fiber coating resin because various effects can be expected through the adhesive resin having different characteristics as compared with the simple coating resin. Hereinafter, this will be described in detail.

First, a polyurethane-based adhesive rather than a polyurethane-based coating resin is used for coating nanofibers. This is because the adhesive resin has better physical properties such as durability and fastness than a resin for coating, and the fine dust- Compared to nanofiber dust-proof mesh coated with coating resin, it can have stronger advantages from external impact or friction.

Ethylene vinyl acetate adhesive improves the flexibility of coating resin by weakening the crystallinity of mixed adhesive, and it can give low temperature property which enables coating treatment at less than 80 ℃. Solubility in various solvents due to polar group It can play a role of improving. Here, due to the increase in flexibility due to the ethylene-vinyl acetate-based adhesive coating resin, the dust-proof mesh manufactured according to the present invention can have strong durability even when applied to a sliding (or roll screen) form, not a fixed type.

This property can be sufficiently expressed that the ethylene-vinyl acetate-based adhesive is mixed with the coating resin in an amount of 60% or more. On the other hand, when the ethylene-vinyl acetate-based adhesive is mixed with the coating resin in an amount of 80% or more, flexibility and adhesiveness are increased but it is only weakened by external impact or friction. In the present invention, the ethylene- Coating resin is used.

On the other hand, the ethylene-vinyl acetate-based adhesive has a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin as compared with the polyurethane-based adhesive, and the polyurethane-based adhesive is superior in durability The tendency to contribute to the improvement of strength is great.

However, the adhesive composition of the coating resin in the present invention is not limited to the above-mentioned examples. That is, in the present invention, a coating resin in which an adhesive of a first component and an adhesive of a second component are mixed is used as a coating resin for nanofibers, wherein the adhesive of the first component is superior to the adhesive of the second component It is preferable that the coating resin has a high tendency to contribute to improvement in flexibility and adhesiveness and that the adhesive of the second component has a strong tendency to contribute to improvement in durability and strength of the coating resin as compared with the adhesive of the first component .

After the finished release paper is produced according to the release paper manufacturing process (S110), a pressure of 0.4 MPa to 0.8 MPa is applied against the nanofiber emission surface of the processed mesh and the coating resin transfer surface of the processed release paper, And then passed through a second roller 230 heated to a temperature of 100-120 占 폚 to produce a release paper bonding mesh (S120). In the present invention, as shown in FIG. 4, a step of drying the release paper to which the coating resin is adhered using the drying apparatus 200 may be further performed before the release paper bonding mesh manufacturing process. After passing through the drying device 220, the solvent may be evaporated and the coating resin may be dried to a suitable viscosity to adhere to the nanofibers.

In the present invention, the pressure applied to the second roller 230 to bond the processed mesh and the processed release paper is 0.4 MPa to 0.8 MPa because the pressure applied to the second roller 230 is 0.4 MPa or less The coating resin transferred to the release paper may have weak adhesion to the nanofiber emission surface and the nanofibers may be damaged if the pressure applied to the second roller 230 exceeds 0.8 MPa.

The second roller 230 is utilized while being heated to 90 ° C to 100 ° C so that the coating resin can adhere well to the nanofibers. In this case, heat of 80 ° C or less is transferred to the actual mesh because the coating resin contains the ethylene-vinyl acetate adhesive as described above, and the coating process can be performed even at a temperature lower than 80 ° C. As described above, in the present invention, low-temperature coating is possible, so that it is prevented that the mesh and nanofibers are physically / chemically weakened due to heat, so that the durability of the dust-proofing mesh can be enhanced.

The pressure applied to the first roller 210 is preferably in the range of 0.2 MPa to 0.4 MPa, which is a half of the pressure applied to the second roller 230. If the pressure applied to the first roller 210 is the same as the pressure applied to the second roller 230 and the coating resin is transferred to the release paper, it is transferred to the release paper when passing through the second roller 230 Because the coating resin may be difficult to adhere perfectly to nanofibers spun into the mesh.

After the releasing paper bonding mesh was prepared, the releasing paper bonding mesh was aged for about 10 hours, and then the releasing paper was removed from the releasing paper bonding mesh so that the coating resin was coated on the nano fiber with a cover factor of 35% to 70% A release paper removing step for manufacturing the coated dustproof mesh is performed (S130). Such a releasing paper removing step may be performed by the separating apparatus 240 as shown in FIG.

Meanwhile, the release paper bonding mesh can be aged at 40 ° C to 50 ° C for 10 hours to 24 hours. This is because the degree of mixing of the ethylene-vinyl acetate-based adhesive and the polyurethane-based adhesive is increased while the coating resin is aged at a temperature higher than room temperature, so that the coating resin stably adheres to the nanofiber layer.

Meanwhile, the dustproof mesh finally fabricated has a cover factor of 35% to 70%, which is an area occupied by the coating resin with respect to the entire dustproof mesh area. When the cover factor is less than 35%, the nanofiber has an external force or friction If the cover factor exceeds 70%, the pores of the nanofiber may be clogged and the breathability may become too low. The dustproof mesh thus manufactured may have a surface area of at least 150 cm ³ / cm ² / s to 170 cm ³ / cm ² / s or more in accordance with JIS L 1096 2010, Method A.

As described above, in order to overcome the disadvantage that the nanofibers are damaged when the coating resin is directly coated on the nanofibers, the method of manufacturing the air circulation type micro dust- And then the coating resin of the release paper is adhered to the nanofiber emission surface of the mesh, thereby minimizing separation or damage of the nanofibers from the mesh during the coating process.

5 conceptually illustrates examples of patterns engraved on the surface of a first roller 210 for transferring a continuous pattern to a release paper in a resin coating apparatus used in a method of manufacturing a fine dust-proofing mesh using nanofibers according to the present invention .

5 (a), a hexagonal continuous pattern for transferring a continuous pattern of hexagons connected to each other by a coating resin is formed on the surface of the first roller 210, and FIG. 5 Referring to FIG. 5 (b), the surface of the first roller 210 has a rectangular continuous pattern for transferring a rectangular continuous pattern connected to a coating resin, and FIG. 5 (c) It can be seen that a triangular continuous pattern for transferring a continuous pattern of triangles connected to each other is engraved on the surface of the first roller 210. Meanwhile, in order to transfer the coating resin to the release paper in the continuous pattern, the pattern engraved in the first roller 210 is not limited to the above-described standard patterns, and may be various irregular continuous patterns.

The dustproof mesh fabricated according to the present invention is coated with a continuous pattern formed by connecting the resin on the nanofiber, so that the damage and peeling of the nanofiber are prevented so that the durable mesh can be easily cleaned. The coating can be reduced in thickness and weight as compared with conventional products in which meshes are laminated, and more excellent visibility and air permeability can be provided.

The characteristics or advantages of the present invention related to the adhesive among the contents discussed above with reference to FIGS. 1 to 5 are summarized as follows.

(1) In the present invention, by applying not only nanofibers but also adhesives by electrospinning, adhesion between nanofibers can be uniform and stronger than that of a basic adhesive spray coating method.

(2) In the present invention, the nanofiber polymer solution is mixed with the adhesive used in the electrospinning step to promote the fiberization of the adhesive, so that the adhesive is prevented from flowing below the grid of the mesh, so that the nanofibers can be uniformly applied.

(3) In the present invention, by coating a nanofiber with a durable coupling agent as compared with a resin for coating, it provides stronger durability against external friction or impact, as compared with the case of coating with a coating resin, It is possible to provide better ventilation and visibility.

Hereinafter, characteristics of the dustproof mesh manufactured according to the present invention will be described in detail by comparing / analyzing the performance of the dustproof mesh manufactured according to the present invention and various comparative examples.

First, the manufacturing methods of the embodiments and the comparative examples are as follows. For reference, the same raw materials and conditions were applied to the examples and the comparative examples except for the specific points mentioned above.

≪ Example 1 >

In the electrospinning step, an adhesive composed of a polyurethane-based adhesive and a PVDF (raw material of nanofiber) mixed at a ratio of 1.5: 1.0 was spun onto a latticed mesh (150 g / m 2) and the nanofibers having a diameter of 600 nm were spun Air circulation type fine dust - proof mesh.

≪ Example 2 >

The coating resin for protecting the mesh after coating nanofibers having a diameter of 600 nm with a mesh size of 150 g / m < 2 > (2.5 g / m < 2 >) was a resin used for an adhesive. Ethylene vinyl acetate- Were used. The pressure of the first roller 210 designed to have a cupper factor of 55% of the coating resin is set to 0.3 MPa, the pressure of the second roller 230 is set to 0.6 MPa and the temperature of the second roller 230 is set to 100 . After drying at 50 ℃ for 12 hours, the release paper was separated and the air circulation type micro dust messy mesh using nanofibers was fabricated.

≪ Comparative Example 1 &

In Example 1, the diameter of the nanofibers was changed to 300 nm to prepare an air circulating fine dust-proofing mesh.

≪ Comparative Example 2 &

In Example 2, the cover factor of the coating resin was changed to 30% to prepare an air circulation type fine dust-proofing mesh.

≪ Comparative Example 3 &

In Example 2, the pressure of the second roller 230 was changed to 0.9 MPa to prepare an air circulation type fine dust-proofing mesh.

≪ Comparative Example 4 &

A nonwoven fabric with a diameter of 800 nm and a density of 8.5 g / m ² was fabricated from polypropylene using a meltblowing apparatus and applied to a dustproof mesh.

Table 1 below is a table comparing the coatability and uniformity of Example 1 and Comparative Example 1. [

division	Application property	Bubble uniformity
Example 1	Good	Good
Comparative Example 1	Bad (multiple holes occur)	Bad (30% uneven)

For reference, the applicability and uniformity of Example 1 and Comparative Example 1 were determined by magnifying and observing at 40X magnification with an optical microscope after nanofiber spinning. Referring to Table 1, Example 1 in which nanofibers having a diameter of 600 nm were both excellent in coating properties and uniformity, but when the nanofibers having a diameter of 300 nm were spun, it was determined that both the uniformity and the application were poor. In the present invention, since the nanofiber having a diameter of 500 nm to 700 nm is radiated to fabricate the dust-proofing mesh, the nanofiber having a diameter of less than 500 nm is superior in strength to the nanofiber, In the present invention, the diameter of the nanofibers is limited to 700 nm or less because, when the diameter of the nanofibers is more than 700 nm, the fine pores between the nanofibers become large and the fine dust collecting efficiency may decrease. Meanwhile, in the present invention, even if the diameter of the nanofiber exceeds 500 nm, the fine dust collecting efficiency of a certain level is ensured because the nanofiber layer is not a two-dimensional structure but a complex three-dimensional network structure, Because the degree of reduction of the fine dust collecting efficiency is less than the increase of the micro pore size due to the increase of the nanofiber diameter.

Table 2 below is a table comparing dust collection efficiency (i.e., fine dust collection efficiency), air permeability, visibility, and nanofiber durability of Example 2 and Comparative Examples 2 to 4.

division	Dust collection efficiency	Air permeability	Visibility	Nanofiber durability
Example 1	81.7	171	45.63	Good
Example 2	80.5	170	47.54	Bad
Example 3	65.7	182	44.02	Bad
Example 4	54.5	250.6	23.50	Not comparable

For the reference, the evaluation of the physical properties of the samples was carried out by the FITI test institute, the internationally recognized testing institute. The dust collection efficiency was ASHRAE STANDARD 52.1, weight method (unit%), air permeability according to JIS L 1096 2010, method A (unit: , And the visibility was evaluated by the transmittance in a range of 450 nm to 750 nm, which is a monochromatic region in the wavelength range (UV-R) of 250 nm to 2,500 nm. The durability was measured by washing the samples with water at 25 ° C using the shower for the best, and a window frame (50 cm x 50 cm) was formed in a sliding (or roll screen) form, Damage to the nanofibers was checked with an optical microscope to judge whether the durability was good or bad.

In Example 2 and Comparative Example 2, the cover factor of the coating resin is 55% and 30%. The difference in the dust collecting efficiency, the air permeability, and the visibility is not different between the two, but the difference is good and bad in durability Able to know. That is, the dustproof mesh manufactured according to the present invention can have durability by setting the cover factor of the coating resin to 35% to 70%.

In Example 2 and Comparative Example 3, the pressure applied to the second roller 230 is 0.6 MPa and 0.9 MPa when the coating resin transferred to the release paper is adhered to the nanofiber emission surface of the mesh. In Comparative Example 2 The pressure applied to the nanofibers was so strong that the nanofibers were peeled from the mesh.

Comparing Example 1 with Comparative Example 4, the dust-proof mesh using the nonwoven fabric made of the existing meltblown has higher air permeability and lower dust collecting efficiency and visibility than the product using the nanofiber according to the present invention Able to know.

6A is a photograph for comparing washing durability of Example 1 according to the present invention and Comparative Example 1 thereof.

6A shows a state in which dust-proof meshes are cleaned 10 times with a shower head as shown above in a state where fine dust is collected in a dust-proof mesh. Referring to Table 1 and FIG. 6A, it can be seen that the amount and condition of the nanofibers of Example 1 after washing were much larger and better than those of Comparative Example 1 after washing. This means that the diameter (600 nm) of the nanofiber used in Example 1 is twice the diameter (300 nm) of the nanofiber used in Example 1, which means that the nanofiber itself has high durability.

FIG. 6B shows that the pressure applied to the second roller 230 for adhesion of the coating resin in Comparative Example 2 of the present invention is excessive, so that the nanofibers are damaged or peeled from the mesh.

Referring to Table 2 and FIG. 6B, since nanofiber peeling occurs in Comparative Example 2, the visibility due to the peeled portion is as high as 65.7% as compared with Example 2 where the aggregation collection efficiency is 81.7% The durability is lowered. As described above, according to the present invention, the pressure of the second roller 230 for adhering the coating resin to the nanofibers can be limited to 0.4 MPa to 0.8 MPa, thereby preventing problems caused by damage due to peeling of the nanofibers.

7 shows the result of the fine dust collecting efficiency test of the dustproof mesh example 2 according to the present invention. Referring to FIG. 7, it can be seen that the dust collection efficiency of Example 2 is 81.7%. This indicates that dust collection efficiency of 80% or more can be achieved while using nanofibers having a diameter of 500 nm to 700 nm.

8A shows a test result of the dustproof mesh embodiment 2 according to the present invention. Referring to FIG. 8A, the value of 170.4 in the second embodiment is very good. The result of this test means that 170.4 cm ³ of air passes per 1 cm ² per cm ² when air pressure of 125Pa is applied to a width of 38cm ² , which can provide sufficient indoor air circulation in everyday life.

FIG. 8B shows a test result of a third party in order to compare the dustproof mesh according to the second embodiment of the present invention with other mass-produced products. For reference, the above-mentioned products are made of nanofibers having a diameter of 300 nm.

8A and 8B, the dust-proof mesh manufactured according to the present invention has 170.4 which is much higher than 140.2 of the dust-proof mesh of other companies made of nanofibers having a diameter of 300 nm and made of nanofibers having a diameter of 600 nm Able to know.

9A to 9D show the visibility test results of the dustproof mesh embodiment 2 according to the present invention. 9A to 9D, the visibility test is a result of testing the light transmittance for a wavelength range of 250 nm to 2,500 nm. In Table 2, the visibility of Example 2 is 45.63%, which is a monochromatic light range of 450 to 750 nm Means an average value of light transmittance. Referring to Table 2 and FIGS. 9A to 9D, it can be seen that visibility is not significantly different between Example 2 and Comparative Examples. This is because the cover factor of the coating resin of all three samples is at least 30% or more.

10 is a graph showing a pore size distribution test result of the dustproof mesh example 2 according to the present invention. 10, the specific gravity of the pore having a diameter of about 18 탆 is the highest at about 18% and 34%, and the specific gravity of the pore having a diameter of 10 탆 to 40 탆 is more than 60% This means that the dust-proofing mesh according to the present invention uses nanofibers having a diameter of 500 nm to 700 nm, which means that the spreadability and uniformity of the mesh are excellent.

11A and 11B show test results of the pollen blocking efficiency of the dustproof mesh example 2 according to the present invention. For reference, this test was conducted in Japan 'KAKEN TEST CENTER'. In Korea, there is no established test method for pollen interruption, so we conducted the test through a Japanese institution that has established test standards. This test was usually carried out using pollen of 20um in diameter. Referring to FIGS. 11A and 11B, it can be seen that the pollen blocking efficiency of Example 2 is very high, which is about 97% on average.

Figure 12 shows actual photographs of the dustproof mesh fabricated according to the present invention. 12, according to the present invention, the coating resin coating the nanofibers may be a regular polygonal continuous pattern such as a hexagon, a continuous pattern of an amorphous shape, and a cover factor Can be controlled in various ways.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

The dust-proof mesh fabricated according to the method of manufacturing an air circulation type dust-free dust-proofing mesh using the nanofibers according to the present invention is characterized in that the nanofiber is separated from the mesh or the damage of the nanofiber is small, It can be widely used in residential facilities such as general homes and apartments, and various industrial facilities such as factories and buildings because it has the advantage of visibility compared to existing dustproof mesh.

Claims (6)

1. An electrospinning step of spinning nanofibers having a diameter of 500 nm to 700 nm with a mesh having a mesh of 1 mm to 5 mm in diameter at 2 g / m ² to 5 g / m ² to produce a processed mesh;

   Release paper (release paper) the resin transfer is passed through the first roller, the first component of the adhesive and a second component of the adhesive mixture is coated with resin to 1.5g / m ² to 3.5g / m consecutive patterns are connected to each other by ^two Wherein the adhesive of the first component has a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin as compared with the adhesive of the second component, The method comprising the steps of: preparing a processed release paper, which has a greater tendency to contribute to improvement in durability and strength of the coating resin as compared with an adhesive;

   The nanofiber radiating surface of the processed mesh and the coated resin transfer surface of the processed release paper were put in contact with each other and passed through a second roller heated to 90 to 100 ° C under a pressure of 0.4 MPa to 0.8 MPa, ; And

   And a release paper removing step of removing the release paper from the release paper bonding mesh to produce a dustproof mesh having a cover factor of 35% to 70% of the coating resin, wherein the air release type micro dust- Gt;
2. The method according to claim 1,

   Characterized in that the ethylene-vinyl acetate adhesive as the adhesive for the first component and the polyurethane adhesive as the adhesive for the second component are mixed in the range of 80:20 to 60:40. Method of manufacturing fine dust - proof mesh.
3. The dustproof mesh manufacturing method according to claim 1,

   The method of claim 1, further comprising aging the release paper bonding mesh at 40 ° C to 50 ° C for 10 hours to 24 hours prior to the step of removing the release paper.
4. The method according to claim 1,

   A step of spinning the nanofibers through the mesh using a top-down electrospinning device and alternately spinning the adhesive and the nanofibers a plurality of times so as to form a nanofiber layer on the top layer,

   Preferably,

   A method for manufacturing an air circulation type micro dust-proofing mesh using nanofibers, which comprises mixing a solution of a nanofiber polymer at a concentration of 10% to 20% in a polyurethane adhesive or an acrylic adhesive.
5. The method of claim 1, wherein the pressure applied to the first roller

   Wherein the air-circulation type fine dust-proofing mesh is manufactured by using a nanofiber.
6. [2] The method of claim 1,

   ASHRAE STANDARD 52.1, the dust collecting efficiency according to the gravimetric method is 80% or more, and the air permeability according to JIS L 1096 2010, Method A is 150 cm ³ / cm ² / s to 170 cm ³ / cm ² / s. A method for fabricating an air circulation type micro dust -

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