CN110226005B - Method for manufacturing air circulation type fine dust-proof net by utilizing nano fiber - Google Patents
Method for manufacturing air circulation type fine dust-proof net by utilizing nano fiber Download PDFInfo
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- CN110226005B CN110226005B CN201880000980.1A CN201880000980A CN110226005B CN 110226005 B CN110226005 B CN 110226005B CN 201880000980 A CN201880000980 A CN 201880000980A CN 110226005 B CN110226005 B CN 110226005B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M17/00—Producing multi-layer textile fabrics
- D06M17/04—Producing multi-layer textile fabrics by applying synthetic resins as adhesives
- D06M17/10—Polyurethanes polyurea
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- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
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Abstract
According to the method for manufacturing a fine dust-proof net using nanofibers, which is to be solved by the present invention, a resin is coated on a net to which nanofibers are adhered by a special process, so that peeling and damage of the nanofibers can be blocked, and a fine dust-proof net having a significantly reduced thickness and weight and excellent visibility and air permeability as compared with conventional products can be manufactured.
Description
Technical area
The present invention relates to a method for manufacturing a dust screen, and more particularly, to a method for manufacturing a dust screen capable of blocking fine dust and preventing damage to nanofibers due to external friction or impact.
Background
In general, a net-like fiber product is used in the form of a roll screen or a frame to which a net-like product of various materials is fixed in order to prevent insects such as insects, but such a product cannot prevent fine dust which has recently become a serious environmental problem.
Although a nonwoven fabric such as a melt-blown nonwoven fabric may be used as a dust-proof net for blocking fine dust, it is difficult to block fine dust having a pm (particulate meter) of 2.5 or less. Further, since visibility outside the window needs to be secured in order to be installed in the window, the conventional filter nonwoven fabric is not suitable. Such visibility problem can be solved by coating a nanofiber layer having high light transmittance on a web without using a nonwoven fabric.
However, in the case where nanofibers, which are fibers having a diameter of several tens to several hundreds nanometers, are coated on a web mainly by electrospinning, they cannot be attached to the web because of their lack of adhesiveness, and thus there is a problem that the filtering function cannot be maintained.
In addition, since the nanofibers have low physical strength, they are easily damaged by external impact or friction, which causes deterioration of product performance. That is, there is a problem in that the nanofiber-coated web is difficult to use in a place where an external force is constantly applied because of poor durability.
Some manufacturers incorporate thin web products onto nanofibers to address the durability of the nanofibers, and such manufacturing methods not only result in increased product thickness and weight, increased raw material costs, but also have a high probability of damage to the nanofibers during the incorporation of the web products. Further, the product with the combined net is not freely usable because the protective net is partially peeled off, the appearance of the product is damaged, and the protective function of the nanofibers is lowered even when the product is used for a long time.
Disclosure of Invention
Accordingly, a technical object of the present invention is to provide a method for manufacturing an air circulation type fine dust-proof screen using nanofibers, in which separation of nanofibers from the screen or damage can be minimized during the manufacturing process by a two-step coating method in which a coating resin is first transferred to two paper sheets and then the coating resin of the two paper sheets is applied to the nanofibers.
Another technical object of the present invention is to provide a method for manufacturing an air circulation type fine dust-proofing net using nanofibers, in which a binder resin is directly coated on the nanofibers to prevent the nanofibers from being peeled and damaged during use, thereby remarkably reducing the thickness and weight compared to conventional products.
Still another technical object of the present invention is to provide a method for manufacturing an air circulation type fine dust-proof screen using nanofibers, in which a coating resin having a continuous grain pattern is coated on the nanofibers at a coverage factor (coverfactor) of 35% to 70%, thereby providing visibility superior to that of a conventional dust-proof screen.
The technical problems to be achieved by the present invention are not limited to the technical problems described above, and other technical problems not described above will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the following descriptions.
To solve the technical problem, the method may include: electrospinning, namely, the nanofiber with the diameter of 500nm to 700nm is spun at the speed of 2g/m2To 5g/m2Irradiating to a net formed with a lattice having a diameter of 1mm to 5mm to manufacture a processed net; a step of manufacturing a processed release paper (release paper), characterized in that the release paper is passed through a first roller for transcribing the resin, and the resin for coating the adhesive mixed with the first component and the second component is applied at 1.5g/m2To 3.5g/m2Transcribing the adhesive of the first component to the release paper in a continuous grain pattern connected to each other, the adhesive of the first component having a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin than the adhesive of the second component having a greater tendency to contribute to improvement in durability and strength of the coating resin than the adhesive of the first component; a step of manufacturing a release paper adhesive web so that the web is attachedThe nanofiber emitting side of the woven web and the resin transfer side of the processed release paper for coating are faced to pass through a second roller applying a pressure of 0.4 to 0.8MPa and heating to 90 to 100 ℃; and a step of removing release paper, in which the release paper is removed from the release paper adhesive net to manufacture the dust screen with the coverage coefficient of the coating resin of 35-70%.
The coating resin may be a coating resin in which an ethylene vinyl acetate binder as the binder of the first component and a polyurethane binder as the binder of the second component are mixed in a range of 80: 20 to 60: 40.
The method for manufacturing the dustproof mesh may further include a curing step of curing the release paper adhesive mesh at 40 to 50 ℃ for 10 to 24 hours before the step of removing the release paper.
The electrospinning step includes a multi-irradiation step of irradiating the nanofibers to the web by turns a binder, which may be formed by mixing a nanofiber polymer solution having a concentration of 10% to 20% in a polyurethane binder or an acrylic binder, and the nanofibers in order to form a nanofiber layer on the uppermost layer after the nanofibers are irradiated to the web by using an electrospinning device of the following formula.
The pressure applied to the first roller may be 0.2MPa to 0.4 MPa.
The dust-proof net has a dust-capturing efficiency of 80% or more by weight method according to ASHRAE STANDARD 52.1.1, and an air permeability of 150cm according to JIS L10962010, method A3/cm2S to 170cm3/cm2Performance in/s.
According to the method for manufacturing the air circulation type fine dust-proof screen using nanofibers of the present invention, there is an effect in that separation or damage of nanofibers from a screen can be minimized during manufacturing by using a two-step coating method in which a coating resin is first transcribed on two paper sheets and then the coating resin of the two paper sheets is coated on the nanofibers.
The method for manufacturing the air circulation type fine dust-proof screen using nanofibers according to the present invention is advantageous in that the dust-proof screen manufactured according to the method is excellent in durability by preventing the nanofibers from being separated from the screen during use by directly bonding the coating resin and the nanofibers to the screen.
The method for manufacturing an air circulation type fine dust-proof screen using nanofibers according to the present invention is advantageous in that the dust-proof screen manufactured according to the method has a visibility superior to that of a conventional dust-proof screen in that a resin for coating with a continuous grain pattern is coated on the nanofibers with a coverage factor (coverfactor) of 35% to 70%.
Drawings
Fig. 1 is a flowchart showing one example of a method of manufacturing a fine dust-proof net using nanofibers according to a first embodiment of the present invention.
Fig. 2 is a conceptual diagram of an electrospinning device for electrospinning nanofibers and a binder in the method for manufacturing a fine dust-control screen using nanofibers shown in fig. 1.
Fig. 3a is a conceptual view showing an example of a radiation portion structure of an electrospinning device used in the method for manufacturing a fine dust-screening net using nanofibers according to the present invention.
Fig. 3b and 3c are enlarged photographs for comparing the binder electrospinning result of the electrospinning step in the present invention with the conventional binder spray coating result.
Fig. 4 is a conceptual view showing an example of a resin coating apparatus for performing resin coating in the method for manufacturing a fine dust-proof net using nanofibers according to the present invention.
Fig. 5 conceptually shows an example of a pattern imprinted on the surface of a first roller for transcribing a continuous grain pattern to a release paper in a resin coating apparatus utilized in a fine dust dustproof mesh manufacturing method using nanofibers according to the present invention.
Fig. 6a shows a case where the pressure applied to the second roller for bonding the coating resin is too large in comparative example 2 to the present invention, and the nanofibers are peeled off from the web or damaged.
Fig. 6b is a photograph for comparing the washing durability of example 2 according to the present invention and the corresponding comparative example 2.
Fig. 7 shows the results of the fine dust capturing efficiency test of the dust-proof net example 2 according to the present invention.
Fig. 8a shows the test results of example 2 of a dust screen according to the invention.
Fig. 8b shows the test results of other companies performed to compare the dust screen embodiment 2 according to the present invention with mass-produced products of other companies.
Fig. 9a to 9d show the visibility test results of embodiment 2 of the dust screen according to the present invention.
Fig. 10 is a graph showing the result of a pore size distribution (pore size distribution) test of example 2 of the dust screen according to the present invention.
Fig. 11a and 11b show the results of the test for the pollen blocking efficiency of the dust screen example 2 according to the present invention.
Fig. 12 shows an actual photograph of a dust screen manufactured according to the present invention.
Detailed Description
For a fuller understanding of the invention, its operating and functional advantages and the objects attained by its practice, reference should be made to the drawings which illustrate preferred embodiments of the invention and to the accompanying descriptive matter in which there is illustrated.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
Fig. 1 is a flowchart showing one example of a method of manufacturing a fine dust-proof net using nanofibers according to a first embodiment of the present invention. Fig. 2 is a conceptual diagram of a down-type electrospinning apparatus 100 for electrospinning nanofibers in the method for manufacturing an air circulation type fine dust-proof screen using nanofibers according to the present invention. Fig. 3 is a conceptual diagram illustrating an example of the structure of the radiation part 120 of the electrospinning apparatus 100 used in the method for manufacturing the air circulation type fine dust-proof screen using nanofibers according to the present invention. Fig. 4 is a conceptual diagram illustrating an example of a resin coating apparatus 200 for performing resin coating in the method for manufacturing a fine dust-proof net using nanofibers according to the present invention.
First, nanofibers are irradiated onto a lattice-type web (mesh) using an electrospinning apparatus, thereby manufacturing a processed web S100. Here, it is preferable that the diameter of the nanofiber is 500nm to 700nm, the diameter of the lattice is 1mm to 5mm, and the nanofiber is 2g/m2To 5g/m2Is irradiated.
The general dust screen is manufactured by using nano fiber with diameter of 200nm to 1000nm, and the nano fiber with diameter of at least 500nm is used in the invention, therefore, the nano fiber itself guarantees certain strength, and in the process of directly radiating nano fiber on the screen, the quantity of nano fiber lost from the gaps of the grid is reduced, and the nano fiber is also helpful for coating evenly.
In addition, in the present invention, nanofibers having a diameter of 700nm or less are used because the fine dust trapping efficiency is reduced because the fine pores between nanofibers become large when nanofibers having a diameter of 700nm or more are used. In addition, the material of the net can be one of PVC with the thickness of 0.1mm to 1mm, glass fiber for PVC coating, PP, PET and Nylon, and the material of the nano fiber can be one of PVDF, TPU, PAN, PET and Nylon.
Due to such a nanofiber diameter limitation, according to the present invention, in the case of manufacturing a dust-proof net using a net having a lattice diameter of 1mm to 5mm, according to ASHRAE STANDARD 52.1.1, the dust capturing efficiency by the gravimetric method can be achieved by 80% or more, and according to JISL 10962010, the air permeability by the a method can be achieved by 150cm3/cm2S to 170cm3/cm2Excellent performance in/s.
Referring to fig. 2, the electrospinning step S100 may be implemented by a down-type electrospinning apparatus 100.
The electrospinning apparatus 100 includes a storage tank 110 for storing a nanofiber polymer solution, a radiation unit 120 for radiating a nanofiber polymer solution, and a collector 130(collector) on which a mesh is disposed. A High Voltage (High Voltage) is applied between the radiation unit 120 and the collector 130.
The storage tank 110 may be provided with a stirring device including a motor M and a propeller for stirring the nanofiber polymer solution. The nanofiber polymer solution stored in the storage tank 110 is pumped by a pump P, and is radiated to a web on a collector 130 through a radiation nozzle 121 of the radiation unit 120, and compressed air is sprayed through an air injection port 122. The pattern is then formed by projecting nanofibers onto the web on the collector 130. In addition, it is preferable that the electrospinning device 100 is a system for maintaining the temperature and humidity of air constant. This is to adjust the resin curing speed in the piping or the injection nozzle due to the inflow of the outside air.
Referring to fig. 3, the radiation section 120 of the electrospinning apparatus 100 of fig. 2 may have a structure in which nanofiber radiation modules and binder radiation modules are alternately arranged along the traveling direction of the web. Each of the radiation modules may have a structure in which a plurality of single radiation portions are continuously arranged so as to cover the entire width of the web.
According to the structure of the radiation unit 120, while the web moves on the collector, the nanofibers are radiated onto the web, and then the binder and the nanofibers are radiated alternately a plurality of times, and the nanofiber layer is radiated onto the uppermost layer. The binder may be a binder obtained by mixing a nanofiber polymer solution having a concentration of 10% to 20% in a specified ratio with a polyurethane or acrylic binder. The specified ratio may be a ratio of 0.5: 1 or even 1.5: 1.
The reason why the nanofiber polymer solution is mixed with the polyurethane or acrylic binder in the production of the binder is that since the binder itself is difficult to fiberize, the binder is fiberized and the binder is prevented from falling down to the web when the binder is irradiated by mixing the nanofibers, so that the nanofibers can be uniformly applied. The process of first performing nanofiber irradiation is also to form a nanofiber layer on the web first, thereby preventing the adhesive from falling down through the lattices of the web, and contributing to uniform coating of nanofibers.
The single radiation unit, as shown in fig. 2, may have a structure including a radiation nozzle and an air injection port, for example. The number of single radiation units in each radiation module may vary depending on the width of the web. For example, the number of single radiating portions may be several tens to several hundreds depending on the width of the mesh.
As observed above with reference to fig. 3a, in the present invention, not only the nanofibers but also the binder are coated on the web by electrospinning in the electrospinning step, and thus the adhesion between the nanofibers is higher than that of the conventional binder spray coating method.
Fig. 3b and 3c are enlarged photographs for comparing the binder electrospinning result in the electrospinning step of the present invention with the conventional binder spray coating result. For reference, visually, though not clearly distinguished, the light brown lines in fig. 3b represent nanofibers, the black lines represent binders, and the black amorphous patch portions in fig. 3c represent binders.
Referring to fig. 3b and 3c, it can be known that the diameter of the adhesive electrospun according to the present invention is thin and uniform, the size of the adhesive mass is small and formed in a nearly spherical shape, and the diameter of the adhesive is coarse and non-uniform when the conventional adhesive is spray-coated, and the size of the adhesive mass is large. According to the difference, in the case where not only nanofibers but also a binder are electrospun in the nanofiber irradiation step, the adhesive force between nanofibers is more uniformly and more strongly exhibited than in the case where a binder is coated by spraying in the related art.
Referring again to fig. 1, the method for manufacturing a dust screen according to the present invention includes a step S110 of manufacturing a processed release paper (releaseppaer), passing the release paper through a first roller 210 for transcribing resin, and coupling coating resin mixed with two adhesives (e.g., coating resin mixed with ethylene vinyl acetate adhesive and urethane adhesive in the range of 80: 20 to 60: 40) in a continuous grain pattern of 1.5g/m in a continuous grain pattern of being coupled to each other2To 3.5g/m2Transcribing to the release paper.
In the present invention, the binder resin is mixed and used as the nanofiber coating resin without using the coating resin, because various effects can be expected by the binder resin having different characteristics from each other, compared with the case of using a simple coating resin. This is observed in detail below.
First, since a polyurethane binder is used for a coating layer of nanofibers instead of a polyurethane coating resin, the binder resin is more excellent in physical properties such as durability and fastness than the coating resin, and the fine dust-proof mesh manufactured according to the present invention has an advantage of being stronger against external impact or friction than a nanofiber dust-proof mesh coated with the coating resin.
The ethylene vinyl acetate binder weakens the crystallinity of the hybrid binder, increases the flexibility of the coating resin, and can impart low-temperature physical properties enabling coating treatment at temperatures lower than 80 ℃, and the polar group can improve the solubility of various solvents. Here, since the ethylene vinyl acetate adhesive coating resin increases flexibility, the dust screen manufactured according to the present invention may have strong durability even when it is applied to a sliding (or rolling) form, not a fixed type.
When 60% or more of the ethylene vinyl acetate binder is mixed in the coating resin, the above properties can be sufficiently exhibited. In contrast, when 80% or more of an ethylene vinyl acetate binder is mixed with the coating resin, the flexibility and adhesiveness are increased, but the coating resin becomes weak against external impact or friction, and therefore, 60% to 80% of the coating resin mixed with the ethylene vinyl acetate binder is used in the present invention.
In addition, the ethylene vinyl acetate adhesive has a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin than the urethane adhesive, and the urethane adhesive has a greater tendency to contribute to improvement in durability and strength of the coating resin than the ethylene vinyl acetate adhesive.
However, the binder formulation of the coating resin in the present invention is not limited to the above examples. In other words, the present invention is characterized in that a coating resin in which a binder of a first component and a binder of a second component are mixed is used as the coating resin for nanofibers, and preferably, the binder of the first component has a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin than the binder of the second component, and the binder of the second component has a greater tendency to contribute to improvement in durability and strength of the coating resin than the binder of the first component.
After the processed release paper is manufactured according to the release paper manufacturing process S110, the nanofiber emitting side of the processed web and the resin transfer side for coating of the processed release paper are made to face each other, so that the second roller 230, which applies a pressure of 0.4MPa to 0.8MPa and is heated to 90 ℃ to 100 ℃, passes through the manufacturing of the release paper adhesive web S120. In addition, as shown in fig. 4, in the present invention, a step of drying the release paper to which the coating resin is adhered by a drying device 200 may be further performed before the release paper adhesive web manufacturing process. If passed through the drying device 220, the solvent may be evaporated to dry the coating resin to a viscosity suitable for bonding to the nanofibers.
In the present invention, the reason why the pressure applied to the second roller 230 is 0.4MPa to 0.8MPa in order to bond the processed web and the processed release paper is that when the pressure applied to the second roller 230 is 0.4MPa or less, the adhesive force of the coating resin transcribed on the release paper to the nanofiber emitting surface is weak, and if the pressure applied to the second roller 230 exceeds 0.8MPa, damage of the nanofibers may occur.
In order to allow the coating resin to be well adhered to the nanofibers, the second roller 230 is used in a state of being heated to 90 to 100 ℃. The heat of 80 ℃ or lower is actually transferred to the web, and as described above, the coating resin contains an ethylene vinyl acetate binder, so that the coating treatment can be performed even at a low temperature of less than 80 ℃. As described above, since the coating can be performed at a low temperature in the present invention, the physical/chemical weakening of the web and the nanofibers due to heat can be prevented, and the durability of the dust screen can be improved.
In addition, it is preferable that the pressure applied to the first roller 210 is 0.2MPa to 0.4MPa, which is 1/2 range of the pressure applied to the second roller 230. Because, if the same pressure as that applied to the second roller 230 is applied to the first roller 210, the coating resin transcribed on the release paper may be difficult to perfectly adhere to the nanofibers irradiated onto the web when passing through the second roller 230 when the coating resin transcribed on the release paper is transcribed on the release paper.
After the release paper adhesive mesh is manufactured, a release paper removing step S130 is performed, after the release paper adhesive mesh is cured for about 10 hours, the release paper is removed from the release paper adhesive mesh, and a resin for coating is coated on the nanofibers according to a continuous grain pattern with a coverage coefficient of 35% to 70%, thereby manufacturing the dust screen. As shown in fig. 4, such a release paper removing step may be implemented by a separating device 240.
Further, the curing of the release paper adhesive web may be carried out at 40 ℃ to 50 ℃ for 10 hours to 24 hours. This is because the coating resin is cured at a temperature equal to or higher than room temperature, and the mixing degree of the ethylene vinyl acetate binder and the polyurethane binder is increased, so that the coating resin is stably bonded to the nanofiber layer.
In addition, the dust-proof screen finally manufactured has a coverage coefficient of 35% to 70% of the area occupied by the coating resin with respect to the entire area of the dust-proof screen, because if the coverage coefficient is less than 35%, the nanofibers are highly likely to be damaged by being excessively exposed by external force or friction, and if the coverage coefficient exceeds 70%, the pores of the nanofibers are blocked and the air permeability is too low. The dust-proof screen thus produced may have a thickness of at least 150cm according to JIS L10962010, method A3/cm2S to 170cm3/cm2Air permeability above s.
As described above, the method for manufacturing an air circulation type fine dust-proofing net using nanofibers according to the present invention is advantageous in that, in order to overcome the disadvantage that nanofibers are damaged when a coating resin is directly applied to nanofibers, the nanofibers are separated from the net or damaged during the application process is minimized by using a two-step coating method in which the coating resin of a release paper is adhered to the nanofiber emitting surface of the net after the coating resin is first transcribed to the release paper.
Fig. 5 conceptually shows an example of a pattern imprinted on the surface of the first roller 210 for transcribing a continuous grain pattern to a release paper in the resin coating apparatus utilized in the fine dust dustproof mesh manufacturing method using nanofibers according to the present invention.
As can be understood from fig. 5 (a), a hexagonal continuous pattern for transcribing the resin for coating in a hexagonal continuous pattern connected to each other to the release paper is engraved on the surface of the first roller 210, a quadrangular continuous pattern for transcribing the resin for coating in a quadrangular continuous pattern connected to each other to the release paper is engraved on the surface of the first roller 210, and as can be understood from fig. 5 (c), a triangular continuous pattern for transcribing the triangular continuous pattern connected to each other is engraved on the surface of the first roller 210. In order to transfer the coating resin to the release paper in a continuous grain pattern, the grain printed on the first roller 210 is not limited to the above-described fixed pattern example, and may be various amorphous continuous grains.
According to the dust screen manufactured by the present invention, since the resin is coated on the nanofibers in a continuous pattern connected to each other, damage and peeling of the nanofibers can be prevented, durability is strong and washing is easy, and by directly coating the resin on the web to which the nanofibers are bonded, thickness and weight can be reduced compared to the existing product of a bonded web, and more excellent visibility and air permeability can be provided.
In addition, the features or advantages of the present invention related to the adhesive are collated as follows in the context observed above with reference to fig. 1 to 5.
① in the present invention, not only the nanofibers but also the binder are coated by electrospinning in the electrospinning step, and the adhesive force between the nanofibers is uniform and strong compared to the basic binder spray coating method.
② in the present invention, the nanofiber is uniformly coated by mixing a nanofiber polymer solution into a binder used in an electrospinning step and radiating the mixture to promote fiberization of the binder, thereby preventing the binder from flowing under the lattice of the web.
③ in the present invention, a binder having a higher durability than that of the coating resin is used, and the nanofiber is coated to provide a higher durability under external friction or impact than the case of coating with the coating resin, and at the same time, since only a part of the nanofiber is coated, it is possible to provide better air permeability and visibility.
The performance of the examples and various comparative examples of dust screens manufactured according to the present invention were compared/analyzed, and the characteristics of the dust screens manufactured according to the present invention were specifically observed.
First, the manufacturing methods of the examples and comparative examples are as follows. For reference, the same raw materials and conditions were used for examples and comparative examples except for the points specifically mentioned.
< example 1>
In the electrospinning step, a binder in which a binder of a polyurethane component and PVDF as a raw material for nanofibers were mixed at a ratio of 1.5: 1.0 was irradiated onto a lattice-type net (150 g/m)2) And nanofibers with a diameter of 600nm were irradiated (or coated) to manufacture an air circulation type fine dust-proofing net.
< example 2>
The nano-fiber with the diameter of 600nm is added with the weight of 2.5g/m2Coating on a grid-shaped mesh (150 g/m)2) Then, the coating resin for the protective mesh is a resin used as a binder, and a binder in which ethylene vinyl acetate and polyurethane are mixed in a ratio of 70: 30 is used. The coverage coefficient of the coating resin was set to 55%, the designed pressure of the first roller 210 was set to 0.3MPa, the pressure of the second roller 230 was set to 0.6MPa, the temperature of the second roller 230 was heated to 100 ℃, and the release paper was separated after the release paper adhesive net was cured at 50 ℃ for 12 hours, thereby manufacturing an air circulation type fine dust-proof net using nanofibers.
< comparative example 1>
The diameter of the nanofibers in example 1 was changed to 300nm, and an air circulation type fine dust-screening net was produced.
< comparative example 2>
The coating resin coverage factor in example 2 was changed to 30%, thereby producing an air circulation type fine dust-proof screen.
< comparative example 3>
The pressure of the second roller 230 in example 2 was changed to 0.9MPa, and an air circulation type fine dust-proof screen was produced.
< comparative example 4>
The polypropylene is used as a raw material by utilizing melt-blown non-woven fabric equipment, and 8.5g/m is prepared by the diameter of 800nm2The nonwoven fabric of (4) and is suitable for a dust screen.
Table 1 below is a table comparing the coatability and uniformity of example 1 and comparative example 1.
[ Table 1]
| Distinguishing | Coatability | Uniformity of |
| Example 1 | Good effect | Good effect |
| Comparative example 1 | Failure (creation of multiple holes) | Failure (30% heterogeneity) |
For reference, the coating properties and uniformity of example 1 and comparative example 1 were judged by a method of irradiating nanofibers and observing the nanofibers at a magnification of 40 using an optical microscope. Referring to table 1, the coating property and uniformity were good in the case of example 1 in which nanofibers with a diameter of 600nm were emitted, but the coating property and uniformity were poor in the case in which nanofibers with a diameter of 300nm were emitted. This means that, in the present invention, since the dust-proof net is manufactured by radiating nanofibers having a diameter of 500nm to 700nm, not only the strength itself of the radiated nanofibers is excellent, but also the coating property and uniformity are excellent, as compared with when nanofibers having a diameter of less than 500nm are used. Further, in the present invention, the diameter of the nanofibers is limited to 700nm or less, because when the diameter of the nanofibers exceeds 700nm, the fine pores between the nanofibers become large, and the fine dust trapping efficiency is low. In addition, in the present invention, even if the diameter of the nanofibers exceeds 500nm, fine dust capturing efficiency above a certain level can be secured because the nanofiber layer that is irradiated is not a two-dimensional structure but a complicated three-dimensional network structure, so that the degree of reduction in fine dust capturing efficiency due to the increase in the diameter of the nanofibers is smaller than the degree of increase in the size of the fine pores due to the increase in the diameter of the nanofibers.
Table 2 below is a table comparing the dust capturing efficiency (i.e., fine dust capturing efficiency), air permeability, visibility, and nanofiber durability of example 2 and comparative examples 2 to 4.
[ Table 2]
| Distinguishing | Efficiency of dust capture | Air permeability | Visibility | Durability of nanofibers |
| Example 1 | 81.7 | 171 | 45.63 | Good effect |
| Example 2 | 80.5 | 170 | 47.54 | Failure of the product |
| Example 3 | 65.7 | 182 | 44.02 | Failure of the product |
| Example 4 | 54.5 | 250.6 | 23.50 | Non-comparison object |
For reference, physical properties of the sample were evaluated at FITI detection research institute of International recognized testing organization, and dust trapping efficiency was evaluated by weight method (unit%) at ASHRAE STANDARD 52.1.1 according to JIS L10962010 and method A (unit: cm)3cm2/s) air permeability was evaluated, and visibility was evaluated by transmittance in a wavelength region (UV-R) of 250nm to 2500nm, in a region of monochromatic light of 450nm to 750 nm. The unit of each evaluation item is omitted below. For durability, a window frame (50cmx50cm) was made in a sliding (or rolling) form by washing a sample with water at 25 ℃ using a household shower, and the window frame was optically displayed after 500 repeated slidingThe damage of the nanofibers was examined by a micromirror, and the durability was judged to be good/bad.
In example 2 and comparative example 2, the coverage coefficients of the coating resins were different at 55% and 30%, and there was no difference in dust capture efficiency, air permeability, visibility, but there was a large difference in durability, which was good and bad. In other words, the dust-proof mesh manufactured according to the present invention may have durability when the coverage factor of the coating resin is 35% to 70%.
The difference between example 2 and comparative example 3 is that when the coating resin transcribed on the release paper was bonded to the nanofiber-emitting surface of the web, the pressure applied to the second roller 230 was 0.6MPa and 0.9MPa, respectively, and in comparative example 2, the pressure applied to the nanofibers was strong, and the nanofibers were peeled off from the web.
In comparative examples 1 and 4, dust-screening using a nonwoven fabric made of a conventional meltblown nonwoven fabric was found to have a high air permeability but a low dust-capturing efficiency and visibility, as compared with the product of the present invention using nanofibers.
Fig. 6a is a photograph for comparing the washing durability of example 1 according to the present invention and the corresponding comparative example 1.
For reference, the photograph of fig. 6a shows a state where the dust screen is washed 10 times with a home shower in a state where fine dust is collected in the dust screen as described above. Referring to table 1 and fig. 6a, it can be seen that the amount and state of the nanofibers of example 1 after washing are more and better than those of comparative example 1 after washing. This means that the diameter (600nm) of the nanofiber used in example 1 was 2 times the diameter (300nm) of the nanofiber used in comparative example 1, and therefore the durability of the nanofiber itself was high.
Fig. 6b shows that excessive pressure is applied to the second roller 230 for bonding the resin for coating in comparative example 2 to the present invention, resulting in peeling or damage of the nanofibers from the web.
As is clear from table 2 and fig. 6b, in comparative example 2, since the nanofiber peeling occurred, the visibility of the peeled portion became high and the durability of the nanofiber became low as compared with example 2 having the dust capturing efficiency of 81.7% which was as low as 65.7%. As such, in the present invention, the pressure of the second roller 230 for binding the coating resin to the nanofibers is defined to be 0.4MPa to 0.8MPa, so that the occurrence of damage due to the peeling of the nanofibers can be prevented.
Fig. 7 shows the results of the fine dust capturing efficiency test of the dust-proof net example 2 according to the present invention. Referring to fig. 7, it can be seen that the dust capturing efficiency of example 2 is 81.7%. This means that high dust capture efficiency of 80% or more can also be achieved in the present invention using nanofibers with diameters of 500nm to 700 nm.
Fig. 8a shows the test results of example 2 of a dust screen according to the invention. Referring to fig. 8a, it can be seen that the air permeability of example 2 is 170.4, which is very good. Results of this test, 38cm2An area of air under a pressure of 125Pa means per cm2Passing through 170.4cm per second3The degree of which can sufficiently realize indoor air circulation in daily life.
Fig. 8b shows the test results of other companies performed to compare the dust screen embodiment 2 according to the present invention with mass-produced products of other companies. For reference, the products of the other companies were made with nanofibers having a large diameter of 300 nm.
Referring to fig. 8a and 8b, it can be seen that the dust screen manufactured according to the present invention has a higher air permeability of 170.4 when manufactured with nanofibers having a diameter of 600nm, compared to 140.2 of dust screens manufactured with nanofibers having a diameter of 300nm by other companies.
Fig. 9a to 9d show the visibility test results of embodiment 2 of the dust screen according to the present invention. Referring to fig. 9a to 9d, the visibility test is a result of testing for light transmittance for a wavelength region of 250nm to 2500nm, and in table 2, the visibility of example 2 of 45.63% represents an average value of light transmittance for a wavelength region of 450nm to 750nm in the monochromatic light region. As can be seen from table 2 and fig. 9a to 9d, there is no great difference in visibility between the cases of example 2 and comparative example. This is because the coverage coefficient of each of the three sample coating resins was at least 30% or more.
Fig. 10 is a graph showing the result of a pore size distribution (pore size distribution) test of example 2 of the dust screen according to the present invention. Referring to fig. 10, it can be seen that the specific gravities of the pores (pores) having diameters of about 18um are the highest, about 18% and 34%, respectively, and the specific gravities of the pores having diameters of 10um to 40um exceed 60% in example 2, which means that the dust screen according to the present invention uses nanofibers having diameters of 500nm to 700nm, so that the coating property and uniformity of the screen are excellent.
Fig. 11a and 11b show the test results for pollen blocking efficiency of example 2 of the dust screen according to the present invention. For reference, the test was performed in "KAKEN test center" in japan, and no test method for pollen blocking was established in korea, so the test was performed by japan organ in which a test reference was established. This test was performed using common pollen size 20um lycopodium powder. Referring to FIGS. 11a and 11b, it can be seen that the pollen blocking efficiency of example 2 is high, and is about 97% on average.
Fig. 12 shows an actual photograph of a dust screen manufactured according to the present invention. Referring to fig. 12, the coating resin for coating the nanofibers may be a patterned polygonal continuous pattern similar to a hexagon, or may be an amorphous pattern of continuous patterns, and the coverage factor of the area occupied by the coating resin in the area of the web may be variously adjusted.
As described above, the present invention is explained by the limited embodiments and the drawings, and the present invention is not limited to the above-described embodiments, and those having ordinary knowledge in the field to which the present invention belongs can make various modifications and variations based on the description.
Therefore, the scope of the present invention is not limited to the embodiments described above, and should be determined not only by the patent claims described below but also by the matters equivalent to the patent claims.
Industrial applicability
The dust screen manufactured by the method for manufacturing an air circulation type fine dust screen using nanofibers according to the present invention has the advantages of little separation of nanofibers from the screen or damage to nanofibers during the manufacturing process, excellent durability, and excellent visibility compared to conventional dust screens, and thus can be widely used in various industrial facilities such as residential facilities such as general homes or apartments, factories, and buildings.
Claims (6)
1. A method for manufacturing an air circulation type fine dust-proof screen using nanofibers comprises the following steps:
electrospinning, namely, the nanofiber with the diameter of 500nm to 700nm is spun at the speed of 2g/m2To 5g/m2Irradiating to a net formed with a lattice having a diameter of 1mm to 5mm, thereby manufacturing a processed net;
a step of manufacturing a processed release paper, characterized in that the release paper is passed through a first roller for transcribing the resin, and the resin for coating the adhesive mixed with the first component and the adhesive of the second component is applied at 1.5g/m2To 3.5g/m2Transcribing the adhesive of the first component to the release paper in a continuous grain pattern connected to each other, the adhesive of the first component having a greater tendency to contribute to improvement in flexibility and adhesiveness of the coating resin than the adhesive of the second component having a greater tendency to contribute to improvement in durability and strength of the coating resin than the adhesive of the first component;
a step of manufacturing a release paper-bonded web such that a nanofiber emitting face of the processed web and a resin transfer face for coating of the processed release paper face each other so that a second roller applying a pressure of 0.4MPa to 0.8MPa and heating to 90 ℃ to 100 ℃ passes; and
a release paper removing step of removing the release paper from the release paper adhesive web, thereby manufacturing a dust screen having a coverage coefficient of the coating resin of 35% to 70%.
2. The method of manufacturing an air circulation type fine dust-control net using nanofibers according to claim 1,
the coating resin is a coating resin in which an ethylene vinyl acetate binder as the binder of the first component and a polyurethane binder as the binder of the second component are mixed in a range of 80: 20 to 60: 40.
3. The method of manufacturing an air circulation type fine dust-proof screen using nanofibers according to claim 1, further comprising:
a curing step of curing the release paper adhesive web at 40 to 50 ℃ for 10 to 24 hours before the release paper removing step.
4. The method of manufacturing an air circulation type fine dust-proof screen using nanofibers according to claim 1, wherein the electrospinning step comprises:
a multi-irradiation step of irradiating the binder and the nanofibers alternately for a plurality of times to form a nanofiber layer on the uppermost layer after the nanofibers are irradiated to the web by using an electrospinning device of a down-type,
the binder is formed by mixing a nanofiber polymer solution with a concentration of 10% to 20% in a polyurethane binder or an acrylic binder.
5. The method of manufacturing an air circulation type fine dust-control net using nanofibers according to claim 1,
the pressure applied to the first roller is 0.2MPa to 0.4 MPa.
6. The method of manufacturing an air circulation type fine dust-control net using nanofibers according to claim 1,
the dust-proof net has a dust-capturing efficiency of 80% or more by weight method according to ASHRAE STANDARD 52.1.1, and an air permeability of 150cm by A method according to JIS L109620103/cm2S to 170cm3/cm2/s。
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| PCT/KR2018/006821 WO2019132139A1 (en) | 2017-05-08 | 2018-06-18 | Method for manufacturing air-circulating type fine dust proof mesh using nano-fiber |
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| KR102010953B1 (en) * | 2019-04-10 | 2019-08-14 | 주식회사 티엔솔루션 | nano-fiber composite mesh for blocking ultra-fine dust having high air permeability |
| KR102112672B1 (en) | 2019-05-20 | 2020-05-21 | 주식회사 투반산업 | Dustproof screen with enhanced durability for nano fiber layer |
| CN112430370B (en) * | 2020-11-02 | 2022-02-18 | 同济大学 | High-strength flame-retardant covering soil dust screen prepared from waste PVC, method and application |
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| KR20140110295A (en) * | 2013-03-07 | 2014-09-17 | (주)에프티이앤이 | The method for promoting abrasion-durability of surface of nano fiber membrane using paper coated with silicon |
| CN105536579A (en) * | 2016-01-29 | 2016-05-04 | 天津工业大学 | Preparation method of asymmetric porous membrane based on electrostatic spinning technology |
| CN106048901A (en) * | 2016-06-12 | 2016-10-26 | 东华大学 | Three-dimensional zigzag nanofiber compound window screen and electrostatic spinning method thereof |
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| KR100934119B1 (en) * | 2008-04-21 | 2009-12-29 | (주)에프티이앤이 | Surface treatment of nanofiber membranes |
| KR20090129050A (en) * | 2008-06-12 | 2009-12-16 | 코오롱패션머티리얼 (주) | Water-proof and moisture-permeable fabric comprising nanofiber web |
| KR101668395B1 (en) | 2016-05-31 | 2016-10-21 | 주식회사 아담스컴퍼니 | Filter with Nano Fiber and Manufacturing Thereof |
| KR101829175B1 (en) * | 2017-05-08 | 2018-02-14 | 양광웅 | manufacturing method of air circulation type dustproof mesh for blocking fine dust using nano-fiber |
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| KR20140110295A (en) * | 2013-03-07 | 2014-09-17 | (주)에프티이앤이 | The method for promoting abrasion-durability of surface of nano fiber membrane using paper coated with silicon |
| CN105536579A (en) * | 2016-01-29 | 2016-05-04 | 天津工业大学 | Preparation method of asymmetric porous membrane based on electrostatic spinning technology |
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Effective date of registration: 20200616 Address after: South Yangzhou City, Gyeonggi Province, South Korea Co-patentee after: Nanotechnology Co.,Ltd. Patentee after: Tian Tian Address before: South Yangzhou City, Gyeonggi Province, South Korea Co-patentee before: Nanotechnology Co.,Ltd. Patentee before: Tian Tian Co-patentee before: Zheng Xiangxun |