KR20230000178A - Manufacturing Nano Mesh Filter for Ultrafine Dust Screen Filtering and its Improving Durability Method - Google Patents

Abstract

The present invention relates to an ultrafine dust-preventing nano dustproof screen, which has a hexagonal net form processed for the purpose of anti-insect and anti-dust for a general window and a method for manufacturing the same. The present invention relates to a nano dustproof screen capable of preventing ultrafine dust, in which a hot-melt resin is coated in the shape of a dot on one surface of net-shaped insectproof screen fabric formed of a polyester thread (fabric 1), a nylon resin is spun in the form of nano fiber on the hot-melt resin (fabric 1) to form an ultrafine dustproof screen having a porous size of 0.1-100 um such that ultrafine dust is prevented (fabric 2), another fabric one is allowed to overlap with a nano spun surface of the fabric 2, and the overlapping product is allowed to pass through a heat adhesive roller, such that the nano dustproof screen spun by the hot-melt resin is firmly fixated to a polyester fabric mesh. The present invention provides a nano dustproof screen for preventing ultrafine dust, which can be used in a manner of being fitted into a window frame in place of an existing insectproof screen attached to a window frame or a door frame, and can prevent ultrafine dust, which is a current major cause of diseases of bronchial and respiratory system, from being introduced indoors as much as possible as the nano dustproof screen is attached to an existing insectproof screen to provide a fine dust preventing function. In addition, the present invention provides a highly functional nano dustproof screen for preventing ultrafine dust, capable of preventing rainwater from being introduced indoors while allowing ventilation, of allowing natural ventilation by allowing a window to be open in all seasons, and of being easily cleaned if necessary by spraying water to the nano dustproof screen.

Description

Manufacturing Nano Mesh Filter for Ultrafine Dust Screen Filtering and its Improving Durability Method}

The present invention relates to a method for manufacturing a dustproof net, and more particularly, to a method for manufacturing a nano dustproof net with improved durability capable of blocking fine dust and preventing nanofibers from being damaged due to external friction or impact.

Yellow dust and fine dust cause various respiratory diseases. These yellow dust and fine dust are frequently occurring in Korea in recent years and have become a major social problem.

Wearing a mask outside can prevent yellow dust and fine dust from entering the human body. However, in the case of a room, because of the need to ventilate the room, when a window is opened, there is a problem in that yellow dust and fine dust from the outside are introduced as they are.

In general, mesh-type textile products are fixed to window frames or used in roll screen form to prevent pests such as fine dust and insects. These products can block fine dust, which has recently become a serious environmental problem. does not exist.

Non-woven fabrics such as melt brown may be used for the dustproof mesh to block fine dust and various pests, but it is difficult to block ultra-fine dust with PM (Particulate Meter) 2.5 or less.

In addition, in order to be installed on a window, the existing non-woven fabric for a filter is not suitable because the transparency to the outside of the window must be guaranteed. This visibility problem can be solved by applying a nanofiber layer having high light transmittance rather than a nonwoven fabric on the mesh.

However, nanofibers are fibers with a diameter of tens to hundreds of nanometers and are mainly produced through electrospinning. When applied on a mesh, nanofibers do not have self-adhesive properties, so they cannot be adhered to the mesh and thus the filter function cannot be maintained. there is.

In addition, since nanofibers have very low physical strength, they are easily damaged by external impact or friction, which causes product performance to deteriorate. That is, due to weak durability, the nanofiber-coated mesh has a problem in that it is difficult to use it where external force often acts.

Nanofibers are radiated to the existing insect screen to form a nano-sized dustproof net, and by firmly adhering it to the surface of the insect screen, it has not only the function of insect repellent but also the function of blocking fine dust, but is breathable and has liquid moisture, that is, rainwater. A nano dustproof net has been developed that can be used as a filter net for windows with excellent functions that does not inflow.

However, the nano dustproof net is configured to protect the nanofibers by thermally bonding a nano-sized dustproof net between the insect screen and the insect screen using a hot melt resin, but this is also fine dust as the insect screen and the nanofibers are easily separated by external impact. There are structural problems such as loss of blocking function of

Looking at the invention by Prior Patent No. 10-1829175 (Method for Manufacturing Air Circulation Type Fine Dust Dustproof Mesh Using Nanofibers), nanomaterials are produced by using PTFE/PVDF (fluororesin series) as secondary processing nanomaterials and materials. Nanoparticles were applied up to the size, however, the fine dust collection state appeared in a white powder state, and the effect was not clear.

Therefore, the technical problem to be solved by the present invention is to provide a method for manufacturing a microfiber dustproof mesh with significantly improved durability by preventing the nanofibers from being separated from the mesh by attaching the nanofibers to the mesh using an adhesive.

Another technical problem to be solved by the present invention is to manufacture a fine dust dustproof mesh that can block peeling and damage of nanofibers by coating a resin on a mesh to which nanofibers are adhered, and whose thickness and weight are significantly reduced compared to existing products. is to provide a way

Another technical problem to be solved by the present invention is to minimize damage to the nanofibers by coating a resin on the mesh to which the nanofibers are adhered using release paper to manufacture a fine dust dustproof mesh having an excellent dustproof effect. is to provide a way

The technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

In order to solve the above technical problem, the fine dust dustproof mesh manufacturing method using nanofibers according to the first embodiment of the present invention is to spin nanofibers on a hexagonal lattice mesh using a top-down electrospinning device. Then, the electrospinning step of producing a processed mesh by spinning the nanofibers and the adhesive so that the nanofiber layer is formed on the uppermost layer while performing the adhesive spinning and the nanofiber spinning several times alternately; By passing the release paper through the first roller for resin transfer to which the coating resin is supplied,

manufacturing a processed release paper by transferring the coating resin to the release paper in a pattern pattern in a hexagonal shape connected to each other and then drying the release paper; Passing the second roller in a state where the electrospinning surface of the processed mesh and the coated resin transfer surface of the processed release paper face each other,

manufacturing a release paper adhesive mesh in which the processed mesh and the processed release paper are adhered to each other by the coating resin; and removing the release paper from the release paper adhesive mesh to manufacture a dustproof mesh coated with a coating resin in a continuous pattern pattern in a hexagonal shape connected to each other.

The mesh is made of one of PVC, PVC-coated glass fiber, PP, and PET with a thickness of 0.01 mm to 0.05 mm, and has a hexagonal lattice density of 36 weave / inch to 50 weave / inch, 80 mono / inch, and 110 mono / inch. use a pattern The upper and lower limbs cannot be used as the same tissue, and the reason is due to the moiré phenomenon that occurs when the same tissue is overlapped, and its use is avoided because it is not natural in relation to it.

The adhesive may be a mixture of a PU or acrylic adhesive and a nanofiber polymer solution having a concentration of 1.0% to 30% at a ratio of 0.1:1 to 0.5:1. The PU or acrylic adhesive and the nanofiber polymer solution may be mixed with each other using a hydrophobic solvent.

The coating resin may be a PU resin for adhesion rather than a PU resin for coating. This is because the physical properties of the PU resin for adhesion are generally superior to those of the PU resin for coating. In the present invention, it is possible to apply PU resin for adhesion by using a release paper for resin coating.

The pressure applied to the second roller may be 1/4 to 1/2 of the pressure applied to bond the processed mesh and the processed material having the thickness of the release paper to each other.

The starting step of the present invention for solving the above technical problem - first treatment step - first compression step - drying step - first curing step - second treatment step - second compression step - heating step - cooling step - second curing Stage - Ends with the packaging stage.

[Example 1]

30 g of PVdF was put in 100 g of DMAC and the polymer solution dissolved at 65 ° C was electrospun at a temperature of 40 ° C, TCD 200 mm, and 70 kv through a nozzle to which a direct current high voltage was applied to obtain 0.5 gsm of nanofibers on a mesh. A nanofiber filter dustproof net was fabricated by laminating a plastic net to the nanofibers thus prepared.

[Example 2]

15% of titanium dioxide was sprayed on 0.5 gsm of the nanofibers spun in Example 1, and then fabricated in the same manner as in Example 1.

[Example 3]

25% of titanium dioxide was sprayed on 0.5 gsm of the nanofibers spun in Example 1, and then fabricated in the same manner as in Example 1.

[Example 4]

It was manufactured in the same manner as in Example 1, except that 0.3 gsm instead of 0.5 gsm of nanofiber was placed on the mesh.

[Example 5]

It was manufactured in the same manner as in Example 2, except that 0.3 gsm instead of 0.5 gsm of nanofibers was placed on the mesh.

[Example 6]

It was manufactured in the same manner as in Example 3, except that 0.3 gsm instead of 0.5 gsm of nanofibers was placed on the mesh.

As tested in the examples, the following results were obtained.

Table 1 shows the dust particle reduction rate of the conventional filter. It showed a low dust particle reduction rate.

Table 2 shows the dust particle reduction rate using the nanofilter tested in Example 1. Although the dust particle reduction rate was high, the reduction rate decreased as the dust particle size decreased.

Table 3 shows the dust particle reduction rate measured using the dustproof net sprayed with titanium dioxide obtained in Example 4, and a dust reduction rate of 99% was obtained when the dust particle size was 2.0 μm, 5.0 μm, and 10.0 μm.

Table 4 measured the efficiency based on the results of the experiments in Examples 1, 2, and 3. Looking at the table, the effect of titanium dioxide was clearly demonstrated as a result of comparative analysis of each example. Examples 2 and 3 in which the titanium dioxide spray coating was added showed markedly improved efficiency, unlike Example 1 in which the titanium dioxide spray coating was not added.

Table 5 shows the overall results of the present invention based on the results of experiments in Examples 1, 4, 5, and 6. As a result of this experiment, the efficiency was satisfied at 86.0% when the nanofiber loading amount was 0.5 gsm, as in Example 1, but the air permeability was remarkably low at 60 cfm.

Accordingly, in Example 4, the air permeability was secured at 560 cfm by adjusting the nanofiber loading amount to 0.3 gsm, but the efficiency was remarkably low at 61%. Accordingly, in the present invention, Examples 5 and 6 were implemented to solve this problem.

In the present invention, instead of lowering the nanofiber loading amount from 0.5 gsm to 0.3 gsm, both efficiency and air permeability were satisfied through titanium dioxide spray coating. In Example 5, when titanium dioxide was spray-coated with 15%, the efficiency was 83% and the air permeability was 560 cfm. got the result

According to the method for manufacturing a fine dust dustproof mesh using nanofibers according to the present invention, a two-step coating method is used in which the coating resin is first transferred to the backing paper and then the coating resin of the backing paper is coated on the nanofibers. It is possible to provide an effect capable of minimizing separation from the mesh or damage to the nanofibers.

The dustproof mesh manufactured according to the method for manufacturing a fine dust dustproof mesh using nanofibers according to the present invention has a very excellent durability by preventing the nanofibers from being separated from the mesh during use by directly adhering the nanofibers to the mesh with the coating resin. have

The dustproof mesh manufactured according to the method for manufacturing a fine dust dustproof mesh using nanofibers according to the present invention is coated with a coating resin having a hexagonal continuous pattern pattern on the nanofibers at a cover factor of 35% to 70% to prevent conventional dustproofing. It may have advantages compared to mesh and excellent visibility.

Figure 01 - Photo of nanofibers with a structure similar to a spider's web with a base layer (woven fiber) sprayed downward
Figure 02 - Upper Knitted Fiber (Hexagonal Pattern) Photo
Figure 03 - Photo of lower weave network structure
Figure 04 - Ultrasonic Imaging Photograph
Figure 05 - Structural photograph according to the density of the lower limb (weaving network) and upper limb (knitting network)
Figure 06 - Differentiation of use according to the density of lower limbs (weaving net) and upper limb (knitting net), and thickness of yarn
Figure 07 - Color photos of upper and lower limbs according to use (gray)
Figure 08 - Color photos of upper and lower limbs according to use (neutral color)
Figure 09 - Bottom (weaving net) application product 1
Figure 10 - Lower (weaving net) application product 2
Figure 11 - Lower (weaving net) application product 3
Figure 12 - Photo of filter for nano dustproof net
Figure 13 - Filter Photo 1 for Master Filter
Figure 14 - Filter Photo 2 for Master Filter
Figure 15 - 2nd and 3rd process diagram
Figure 16 - Reduction rate of untreated general filter
Figure 17 - Reduction rate of untreated nanofiber filter
Figure 18 - Result of untreated anti-vibration net reduction rate
19 - Results of Examples 1, 2, and 3 (0.5 gsm nanofibers)
20 - Examples 1, 4, 5, 6, efficiency, air permeability eggs and
Figure 21 - Structure of nano dustproof net with improved durability

First of all, with the application of fine dust nanofibers, the nanofibers generated from the nozzle of the nano-spinner are spun long into nano-sized fibers, and the substance is downwardly sprayed onto the base layer (woven fabric) to realize a structure similar to a spider web. do.

This is because the base is very fragile, so another secondary post-process is required to prevent damage to the spun spider web-like nanostructure.

That is, firstly, the spun tissue is attached to the woven fiber equipped with the left and right tensile force with the knitted fiber having good contraction and elasticity, and the second bonding process is performed with the nanomaterial in the center in between to form air permeability and capture rate.

One of the principles is that the lower weaving network maintains a constant line (weft/warp) spacing to secure ventilation and at the same time prevent it from stretching left and right, preserving the easily damaged nanostructure as it is spun, and the upper knitted fiber ( Hexagonal pattern) has breathability as well as restoration and elasticity different from the lower tissue, allowing the soft nanostructure to be maintained and maintained by dispersing and neutralizing the stiff touch feeling of the lower weaving network.

As for the effect of the ultrasonic tertiary processing, the nanomaterials spun into the lower weaving network are the bonding process of the upper weaving network. structure that can be

Due to the nature of the product, it is folded and bent, and a separation layer may be formed due to frequent washing, and its lifespan is reduced.

Therefore, in order to compensate for this, the entire knitting network with the weaving network and the nanostructure in between was subjected to ultrasonic compression processing in a mold standard of a certain size to maintain air permeability and capture rate as it was, and to integrate the upper and lower tissues.

As for the change in function and use of each product, it can be applied according to the user's purpose of use, and the use can be differentiated according to the density and thickness of the yarn of the lower (weaving network) and upper (knitting network), and also nanostructured The collection rate can be applied differently depending on the density of the dust, so it is classified into a collection rate of about 70% in the case of a dustproof net that controls fine dust and a collection rate of 84% to 92% in the case of a mask filter. Therefore, the collection rate is in inverse proportion to the air permeability, so the air permeability compared to the collection rate is measured much lower for the mask filter than for the dustproof net.

The color contrast of the upper and lower limbs can be selected according to the purpose. Set the color of the upper and lower limbs to black and white or gray tones, but the colors of the upper and lower limbs can be the same. When two-tone is applied, gray is maintained as a neutral color. .

As for the application of the lower layer (weaving net), there are cases in which yarns are used as mono yarns and filler yarns are used as the material of the lower layer (weaving net). is used as

Specifications for the lower part (36 weave, 50 weave, 80 mono, 110 mono, etc.) Hexagonal mesh pattern is mainly used for the upper part.

The upper and lower limbs cannot be used as the same tissue, and the reason is due to the moiré phenomenon that occurs when the same tissue is overlapped, and its use is avoided because it is not natural in relation to it.

The two types of nanoradiation are largely divided into those for dust shields and those for mask filters, and sometimes subdivided according to the selectivity of the lower and upper limbs. In the case of a dustproof net, the capture rate is mainly in the 70% band and the capture rate in the 84 to 92% band via the mask filter, and the air permeability is in inverse proportion.

The second and third process charts can be understood by referring to the figure below.

Claims (3)

A method for manufacturing a fine dust-proof mesh having excellent dust-proof effect by minimizing damage to nano-fibers by coating resin on the mesh to which nano-fibers are adhered using release paper
A method of manufacturing a fine dust dustproof mesh that can block peeling and damage of nanofibers by coating a resin on the mesh to which nanofibers are adhered and has a significantly reduced thickness and weight compared to existing products
Nanofibers are adhered to the mesh using a PU or acrylic adhesive and a nanofiber polymer solution adhesive at a concentration of 1.0% to 30% to prevent the nanofibers from being separated from the mesh to produce a microfiber dustproof mesh with significantly improved durability method

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