JP2020139360A - Net for building member and manufacturing method thereof - Google Patents

Abstract

To provide a net for a building member which is excellent in pollen collecting property, and more excellent in air permeability and view property than a conventional screen door.SOLUTION: A net 1 for a building member comprises a net base 2 made up of warps 3 and wefts 4 which are welded at intersection points 5 of the warps 3 and the wefts 4, and a nanofiber layer 6 in which nanofibers 7 are attached to the net base 2 without using an adhesive. The net base 2 has a coarse mesh number such that the nanofibers 7 do not come off when the nanofibers 7 are attached to the net base 2, and the fiber diameter of the warps 3 and the fiber diameter of the wefts 4 are both in the range of 0.10 mm to 0.30 mm, and the nanofiber layer 6 has an average fiber diameter of the nanofibers 7 in the range of 300 nm to 3000 nm and a weight-attaching amount in the range of 0.05 g/m2 to 0.5 g/m2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a net for building materials and a method for producing the same.

Pollinosis is now a national disease, with a pollinosis rate of 47% in the metropolitan area. Pollinosis causes a decrease in QOL (Quality Of Life), such as hindering study, work, and housework. As measures against hay fever, "wear a mask", "gargle / wash hands", "wash face and eyes", "remove pollen from clothes", "do not dry outside", "do not open windows", Measures such as "taking prescription and over-the-counter medicines", "taking ingredients that are effective against hay fever", "taking health foods / supplements", and "using pollen block spray / cream" can be mentioned. Of these, 23% of all people are implementing the measure of "not opening windows".

However, if the measures of "do not open the window", that is, "do not ventilate" are taken, the air becomes dirty. As housing becomes more airtight, air pollution due to chemical substances is more likely to occur, and when the humidity is high, bacteria, mold, and mites are more likely to grow, and carbon monoxide is also emitted from general oil stoves and gas stoves. This is all the more because pollutants such as carbon, carbon dioxide and nitrogen oxides are released. Ninety-five percent of people with hay fever develop from February to May, and since this period overlaps with the outbreak of colds and influenza, ventilation is also very important, and "Do not ventilate due to hay fever." Is a problem. Therefore, windows (screen doors) capable of ventilating while preventing pollen from entering the room have been proposed and sold (see, for example, Non-Patent Documents 1 and 2).

Of these, the screen door described in Non-Patent Document 1 has a stitch size smaller than that of the conventional screen door (about 80 μm, about 1/160 of the conventional screen door), and pollen invasion is 80% or more. It is said that it can be stopped. Further, the screen door described in Non-Patent Document 2 has a special filter interposed between the inner net and the outer net, and is said to be able to collect 98% or more of particles of 30 μm to 40 μm corresponding to pollen. There is.

"Cross Cabin R / Cross Cabin RVT (Polyester High Mesh for Screen Doors)", Suminoe Textile Co., Ltd., [online], [Search on February 22, 2019], Internet (http://suminoe.jp/products/functional_material) /crosscabin.html) "Strong block of unwanted particles such as pollen and mold spores Air cleaning screen door Nano Catch", Sanes Co., Ltd., [online], [Search on February 18, 2019], Internet (https://sanesu.net/wp/ wp-content / uploads / 2017/05/Nano Catch.pdf)

JP-A-2014-47474

However, the screen door described in Non-Patent Document 1 described above has a problem that the total area ratio of the stitch openings is small, so that the air permeability is low and the viewability is extremely low. On the other hand, the screen door described in Non-Patent Document 2 described above has a problem that the air permeability and the viewability are extremely low because the special filter uses a non-woven fabric.

Therefore, an object of the present invention is to provide a net for building materials and a method for producing the same, which are excellent in pollen collecting property and also have excellent breathability and viewability as compared with a conventional screen door.

[1] The net for building materials of the present invention is composed of warp threads (warp threads) and weft threads (weft threads), and the net base material in which the intersections of the warp threads and the weft threads are welded together with the net base without using an adhesive. The material is provided with a nanofiber layer to which nanofibers are attached, and the net base material has a number of meshes having a roughness so that the nanofibers do not strike through when the nanofibers are attached to the net base material. The fiber diameter of the warp and the fiber diameter of the weft are both in the range of 0.10 mm to 0.30 mm, and the nanofiber layer has an average fiber diameter of 300 nm to 3000 nm. in the range of, and basis weight is characterized in that in the range of ^{0.05g / m 2 ~0.5g / m 2} .

In building materials net of the present invention, the the basis weight of the nanofiber layer was in the range of 0.05g ^{/ m 2} ~0.5g ^/ m 2, the basis weight of the nanofiber layer than 0.05 g / ^{m 2} If it is too small, the grain of the nanofiber layer may be too coarse to obtain a sufficiently high pollen collection rate, and if the grain amount of the nanofiber layer is larger than 0.5 g / m ² , the nanofiber layer may not be obtained. This is because the fibers of the fiber layer may be too fine to obtain sufficient air permeability and viewability. From these viewpoints, the basis weight of the nanofiber layer is preferably larger than 0.08 g / m ² , and even more preferably larger than 0.10 g / m ² . The basis weight of the nanofiber layer is preferably smaller than 0.4 g / m ² , and even more preferably smaller than 0.3 g / m ² .

Further, in the net for building materials of the present invention, it is the fiber diameter of the warp and the fiber diameter of the warp that the fiber diameter of the warp and the fiber diameter of the weft are both in the range of 0.10 mm to 0.30 mm. This is because if either of the weft fiber diameters is smaller than 0.10 mm, either the warp or the weft may be too thin to obtain sufficient mechanical strength, and the warp fibers may not be obtained. This is because if either the diameter or the fiber diameter of the weft is thicker than 0.30 mm, either the warp or the weft may be too thick to obtain sufficient air permeability and viewability. ..

Further, in the net for building materials of the present invention, the net base material is a net base material having a mesh number having a roughness so that the nanofibers do not strike through when the nanofibers are attached to the net base material. When the net base material is a net base material having a mesh number having a roughness that allows the nano fibers to strike through when the nano fibers are attached to the net base material, the nanofibers with respect to the net base material are used. This is because the adhesion density and adhesion strength of the material may not be sufficiently high, and a net for building materials having a stable mechanical structure may not be realized.

Further, in the building material net of the present invention, the net base material is a net base material in which the intersections of the warp and the weft are welded, because the net base material is not welded at the intersections of the warp and the weft. This is because sufficient mechanical strength may not be obtained in the case of a net base material, and dust may easily collect at intersections when using a building material net. This is because the warp and weft become easy to move when assembling or using the net for building materials, and the nanofibers may be broken due to this.

Further, in the net for building materials of the present invention, the nanofiber layer is formed as a nanofiber layer that is attached to the net base material without using an adhesive, because the nanofiber layer is used as a net base material via an adhesive. This is because, in the case of the nanofiber layer adhering to the above, the adhesive may obstruct the passage of air and light, and sufficient air permeability and viewability may not be obtained.

Further, in the building material net of the present invention, the reason why the average fiber diameter of the nanofibers is in the range of 300 nm to 3000 nm is that when the average fiber diameter of the nanofibers is smaller than 300 nm, the machine is sufficient as a nanofiber layer. This is because the target strength may not be obtained, and sufficient adhesive force between the net base material and the nanofiber layer may not be obtained. On the other hand, when the average fiber diameter of the nanofibers is thicker than 3000 nm, the nanofibers may be too thick to obtain sufficient air permeability and viewability.

As a result, the building material net of the present invention is a building material net that is excellent in pollen collecting property and is more breathable and viewable than the conventional screen door.

A screen door itself having a structure in which a nanofiber layer is attached to a net base material is known (see, for example, Patent Document 1). However, in the screen door described in Patent Document 1, a nanofiber layer is attached to a net base material via an adhesive. Therefore, in the screen door described in Patent Document 1, the adhesive may obstruct the passage of air and light, and sufficient air permeability and viewability may not be obtained.

In the present invention, the number of meshes means the number of meshes existing per inch of mesh yarn. Of these, the number of meshes in the warp direction refers to the number of meshes existing per inch of warp threads, and the number of meshes in the weft direction refers to the number of meshes existing per inch of weft threads.

[2] In the net for building materials of the present invention, it is preferable that the number of meshes of the net base material is in the range of 24 mesh to 44 mesh in both the warp direction and the weft direction.

In the net for building materials of the present invention, the number of meshes of the net base material is within the range of 24 meshes to 44 meshes in both the warp direction and the weft direction, because the number of meshes of the net base material is larger than 24 meshes. If it is small, the mesh of the mesh substrate may be too coarse and insects may easily pass through the mesh, and if the number of meshes of the mesh substrate is larger than 44 mesh, the mesh of the mesh substrate is too fine. This is because sufficient air permeability and viewability may not be obtained. From these viewpoints, the number of meshes of the net base material is preferably larger than 26 meshes in both the warp direction and the weft direction, and even more preferably larger than 28 meshes. Further, the number of meshes of the net base material is preferably smaller than 42 meshes in both the warp direction and the weft direction, and even more preferably smaller than 40 meshes.

[3] In the net for building materials of the present invention, the net base material preferably has 28 meshes or more in at least one of the warp direction and the weft direction.

In the building material net of the present invention, the number of meshes of the net base material is 28 meshes or more in at least one of the warp direction and the weft direction because the number of meshes is 28 meshes in both the warp direction and the weft direction. If it is too small, the space between the mesh threads along at least one of the warp threads may become too wide and the nanofiber layer may strike through, making it impossible to realize a net for building materials with a stable mechanical structure. Because there is. From this point of view, the number of meshes of the net base material is preferably larger than 30 meshes in at least one of the warp direction and the weft direction, and even more preferably larger than 33 meshes.

[4] In the net for building materials of the present invention, the nanofibers are preferably made of a poorly hydrolyzable resin.

The net for building materials of the present invention is a net for building materials having excellent weather resistance because the nanofibers are made of a poorly hydrolyzable resin.

[5] In the net for building materials of the present invention, the nanofibers are preferably made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin.

In the building material net of the present invention, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin, the nanofibers are made of a poorly hydrolyzable resin, and the net for building materials has excellent weather resistance. .. Further, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin in this way, the nanofibers are made of a stretchable and flexible resin, and when assembling or using a net for building materials. It is a durable net for building materials where nanofibers are not easily broken. Further, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin in this way, the adhesive force between the net base material and the nanofibers becomes strong, which also causes the assembly of the building material net. It is a durable net for building materials whose nanofibers are not easily broken during use.

[6] In the net for building materials of the present invention, the nanofibers are preferably black nanofibers.

Since the nanofibers of the net for building materials of the present invention are black nanofibers, the nanofiber layer becomes inconspicuous, and the net for building materials has excellent visibility.

[7] In the net for building materials of the present invention, both the warp and the weft have a second resin having a melting point lower than that of the first resin around a core member made of the first resin having a predetermined melting point. It preferably has a core-sheath structure in which a fat-made sheath member is coated.

Since the building material net of the present invention has the core-sheath structure as described above, it is a building material net that can easily manufacture a building material net having a structure in which the intersections of the warp and the weft are welded. In this case, as the warp and weft, a net yarn having a core-sheath structure in which the first resin is a normal high melting point polypropylene and the second resin is a low melting point copolymerized polypropylene can be preferably used.

[8] In the building material net of the present invention, it is preferable that both the warp and the weft have a core-sheath structure in which a resin-made sheath member is coated around a glass fiber core member.

Since the building material net of the present invention has the core-sheath structure as described above, it is easy to obtain a building material net having a structure in which the intersections of the warp and weft are welded, as in the case of [7] above. It will be a manufacturable net for building materials.

The above-mentioned preferable features of the building material net of the present invention can be similarly applied to the following method for manufacturing a building material net.

[9] The method for producing a net for building materials of the present invention is a net base material composed of warp threads (warp threads) and weft threads (weft threads), and the intersections of the warp threads and the weft threads are welded to each other, and the fibers of the warp threads. One surface of the net base material is prepared by using a net base material preparation step of preparing a net base material having a diameter and a fiber diameter of the weft in the range of 0.10 mm to 0.30 mm and an electrospinning method. the average fiber diameter is from nanofibers that are within the scope of 300Nm～3000nm, basis weight nanofiber layer formed for forming a nanofiber layer in the range of 0.05g ^{/ m 2} ~0.5g ^/ m 2 In the net base material preparation step including the step, a net base material having a mesh number having a roughness so that the nanofibers do not strike through when the nanofibers are attached to the net base material is prepared. It is characterized by that.

According to the method for producing a net for building materials of the present invention, an adhesive is used because the nanofibers shrink and firmly bond with the net thread in the process of volatilizing after the solvent component adheres to the surface of the net thread during electrospinning. The nanofiber layer can be attached to the net base material without any problem, which is a method for producing a building material net suitable for producing the building material net of the present invention.

[10] The method for producing a net for building materials of the present invention preferably further includes a heat treatment step for increasing the adhesive force between the net base material and the nanofiber layer after the nanofiber layer forming step.

By adopting such a method, the surface of the net yarn and the surface of the nanofibers are once melted or softened, and the adhesive force between the net base material and the nanofiber layer can be increased, and the nanofibers can be increased. It is possible to manufacture a net for building materials whose layers are not easily peeled off.

[11] The method for producing a net for a building material of the present invention is a net base material composed of warp threads (warp threads) and weft threads (weft threads) in which the intersections of the warp threads and the weft threads are not welded, and the fibers of the warp threads. One surface of the net base material is prepared by using a net base material preparation step of preparing a net base material having a diameter and a fiber diameter of the weft in the range of 0.10 mm to 0.30 mm and an electrospinning method. the average fiber diameter is from nanofibers that are within the scope of 300Nm～3000nm, basis weight nanofiber layer formed for forming a nanofiber layer in the range of 0.05g ^{/ m 2} ~0.5g ^/ m 2 The step includes a heat treatment step for welding the intersection of the warp and the weft and increasing the adhesive force between the mesh base material and the nanofiber layer, and the net base material preparation step includes the step. It is characterized in that a net base material having a number of meshes having a roughness that does not allow the nanofibers to strike through when the nanofibers are attached to the net base material is prepared.

According to the method for producing a net for building materials of the present invention, an adhesive is used because the nanofibers shrink and firmly bond with the net thread in the process of volatilizing after the solvent component adheres to the surface of the net thread during electrospinning. The nanofiber layer can be attached to the net base material without any problem, which is a method for producing a building material net suitable for producing the building material net of the present invention. In addition, since the intersection of the warp and the weft can be welded and the adhesive force between the net base material and the nanofiber layer can be increased in one heat treatment step, it is possible to manufacture a net for building materials at a low manufacturing cost. Become.

It is an enlarged plan view of the main part of the net for building materials which concerns on Embodiment 1. It is a process drawing in the manufacturing method of the net for building materials which concerns on Embodiment 1. FIG. It is a figure which shows for demonstrating the net base material preparation process. It is a figure which shows for demonstrating the nanofiber layer formation process. It is a process drawing in the manufacturing method of the net for building materials which concerns on Embodiment 2. It is a figure which shows for demonstrating the nanofiber layer formation process. It is a process drawing in the manufacturing method of the net for building materials which concerns on Embodiment 3. It is a figure which shows for demonstrating the net base material preparation process. It is a figure which shows for demonstrating the nanofiber layer formation process. It is a chart which shows the specifications of each sample (samples 1-12) used in an Example. It is an enlarged plan view of the main part of samples 1 to 4 and 9. It is a figure which shows for demonstrating the pollen collection property test. It is a chart which shows the test result for each sample.

Hereinafter, the building material net of the present invention and the manufacturing method thereof will be described in detail using each embodiment shown in the figure. It should be noted that each embodiment described below does not limit the invention according to the claims. Moreover, not all of the elements and combinations thereof described in each embodiment are essential for the means for solving the present invention. In each embodiment, for components having the same basic configuration and features, the same reference numerals may be used across the respective embodiments, and the description may be omitted. The diagram displaying the components of the invention is a schematic diagram and does not necessarily accurately represent the actual dimensions and ratios.

[Embodiment 1]
1. 1. Net for building materials FIG. 1 is an enlarged plan view of a main part of a net for building materials according to the first embodiment.
As shown in FIG. 1, the building material net 1 according to the first embodiment is composed of a warp 3 (warp) and a weft 4 (weft), and a net base material 2 in which the intersection 5 of the warp 3 and the weft 4 is welded. And the nanofiber layer 6 in which the nanofibers 7 are randomly or spider web-shaped attached to the net base material 2 without using an adhesive.

The mesh base material 2 has a number of meshes having a roughness that prevents the nanofibers from strike-through when the nanofibers are attached to the net base material, and has a warp fiber diameter and a weft fiber diameter. Both are in the range of 0.10 mm to 0.30 mm.

The mesh base material 2 has a mesh number of 24 meshes to 44 meshes in both the warp direction and the weft direction, and has a mesh number of 28 meshes or more in at least one of the warp direction and the weft direction. Some can be preferably used.

Both the warp threads 3 and the weft threads 4 have a core-sheath structure in which a sheath member made of a second resin having a melting point lower than that of the first resin is coated around a core member made of a first resin having a predetermined melting point. It is a thing. As the first resin, for example, high melting point polypropylene can be preferably used, and as the second resin, for example, low melting point copolymerized polypropylene can be preferably used.

Nanofiber layer 6 is in the range the average fiber diameter of the nanofibers 7 is 300Nm～3000nm, and basis weight is in the range of ^{0.05g / m 2 ~0.5g / m 2} .

The nanofiber 7 is made of a poorly hydrolyzable resin. The nanofiber 7 is made of, for example, a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin.

2. 2. Manufacturing Method of Building Material Net FIG. 2 is a process diagram in the building material net manufacturing method according to the first embodiment. FIG. 3 is a diagram shown for explaining the net base material preparation process. FIG. 3A is a plan view of the net base material 2, and FIG. 3B is a perspective view of the net base material 2 wound in a roll shape. FIG. 4 is a diagram shown for explaining the nanofiber layer forming step.

As shown in FIG. 2, the method for manufacturing a net for building materials according to the first embodiment includes a net base material preparation step S11 and a nanofiber layer forming step S12.

The net base material preparation step S11 is a net base material composed of warp threads (warp threads) and weft threads (weft threads) in which the intersections of the warp threads and the weft threads are welded, and when the nanofibers are attached to the net base material. A net group having a mesh number having a roughness that does not allow the nanofibers to strike through, and the fiber diameters of the warp threads and the weft threads are both in the range of 0.10 mm to 0.30 mm. This is a step of preparing a material (see FIG. 3). In the first embodiment, as the net base material, the number of meshes is in the range of 24 meshes to 44 meshes in both the warp direction and the weft direction, and the number of meshes is in at least one of the warp direction and the weft direction. 28 mesh or more can be preferably used.

The nanofiber layer forming step S12 is composed of nanofibers having an average fiber diameter in the range of 300 nm to 3000 nm on one surface of the net base material 2 by using an electrospinning method, and has a grain size of 0.05 g / m. ^This is a step of forming a nanofiber layer in the range of ^{2 to} 0.5 g / m ² (see FIG. 4). The formation of the nanofiber layer is performed, for example, randomly (or in a spider web). In FIG. 4, reference numeral 10 indicates an electrospinning device, reference numeral 11 indicates a tank, reference numeral 12 indicates a polymer solution, reference numeral 13 indicates a valve, reference numeral 14 indicates an electrospinning nozzle, and reference numeral 15 indicates a metal. A collector is indicated, reference numeral 16 indicates a pull-out roll, and reference numeral 17 indicates a take-up roll.

3. 3. Effect of the first embodiment Since the building material net 1 according to the first embodiment has the above-described configuration, the building material has excellent pollen collecting property and is more breathable and viewable than the conventional screen door. It becomes a net for.

Further, the building material net 1 according to the first embodiment is a building material net having excellent weather resistance because the nanofibers are made of a poorly hydrolyzable resin.
Further, in the building material net 1 according to the first embodiment, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin, the nanofibers are made of a poorly hydrolyzable resin and have excellent weather resistance. It will be a net for building materials. Further, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin in this way, the nanofibers are made of a stretchable and flexible resin, and when assembling or using a net for building materials. It is a durable net for building materials where nanofibers are not easily broken. Further, since the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin in this way, the adhesive force between the net base material and the nanofibers becomes strong, which also causes the assembly of the building material net. It is a durable net for building materials whose nanofibers are not easily broken during use.

Further, since the building material net 1 according to the first embodiment has the core-sheath structure as described above, it is for a building material that can easily manufacture a building material net having a structure in which the intersections of the warp and the weft are welded. Become a net.

According to the method for manufacturing a net for building materials according to the first embodiment, an adhesive is used because the nanofibers shrink and firmly bond with the net thread in the process of volatilizing after the solvent component adheres to the surface of the net thread during electrospinning. The nanofiber layer can be attached to the net base material without any need, which is a method for producing a building material net suitable for producing the building material net of the present invention.

[Embodiment 2]
FIG. 5 is a process diagram in the method for manufacturing a net for building materials according to the second embodiment. FIG. 6 is a diagram shown for explaining the nanofiber layer forming step.

The method for manufacturing a building material net according to the second embodiment basically includes the same steps as the method for manufacturing a building material net according to the first embodiment, but as shown in FIG. 5, the nanofiber layer forming step S12 Later, a heat treatment step S13 for increasing the adhesive force between the net base material and the nanofiber layer is further included.

In the heat treatment step S13, after the nanofiber layer is formed on one surface of the net base material 2 by the electrospinning method, the net base material on which the nanofiber layer is formed is formed from the upper and lower surfaces before being wound on a roll. It may be carried out simply by heating (see FIG. 6), or by pressurizing and heating the net base material on which the nanofiber layer is formed by passing it through a pair of upper and lower heating rollers (thermal calendar processing). You may.

According to the method for manufacturing a net for building materials according to the second embodiment, the surface of the net thread and the surface of the nanofibers are once melted or softened, and the adhesive force between the net base material and the nanofiber layer is increased. It is possible to manufacture a net for building materials in which the nanofiber layer is not easily peeled off.

[Embodiment 3]
FIG. 7 is a process diagram in the method for manufacturing a net for building materials according to the third embodiment. FIG. 8 is a diagram shown for explaining the net base material preparation process. FIG. 9 is a diagram shown for explaining the nanofiber layer forming step.

As shown in FIG. 7, the method for manufacturing the building material net according to the third embodiment basically includes the same steps as the method for manufacturing the building material net according to the second embodiment, but in the net base material preparation step S21. As a net base material to be prepared, as shown in FIG. 8, a net base material 2a in which the intersection 5 of the warp 3 and the weft 4 is not welded is prepared. Then, the heat treatment step S23 carried out after the nanofiber layer forming step S22 not only increases the adhesive force between the net base material 2a and the nanofiber layer 6, but also welds the intersection 5 of the warp 3 and the weft 4.

According to the method for manufacturing a net for building materials according to the third embodiment, an adhesive is used because the nanofibers shrink and firmly bond with the net thread in the process of volatilizing after the solvent component adheres to the surface of the net thread during electrospinning. The nanofiber layer can be attached to the net base material without any need, which is a method for producing a building material net suitable for producing the building material net of the present invention. In addition, since the intersection of the warp and the weft can be welded and the adhesive force between the net base material and the nanofiber layer can be increased in one heat treatment step, it is possible to manufacture a net for building materials at a low manufacturing cost. Become.

[Example]
FIG. 10 is a chart showing the specifications of each sample (samples 1 to 12) used in the examples. FIG. 11 is an enlarged plan view of a main part of Samples 1 to 4 and 9. FIG. 12 is a diagram shown for explaining the pollen collection test. FIG. 13 is a chart showing the test results for each sample.

(1) Preparation of sample (1-1) Sample 1
Using a net in which the intersections of the warp and weft threads of a 24 x 36 mesh made of threads having black polypropylene (PP) / copolymerized PP (core-sheath structure) with a fiber diameter of 0.15 mm are fused as a net base material. A net for building materials was produced by spinning polypropylene-based polyurethane nanofibers (nanofibers) having a fiber diameter of 800 nm directly onto a mesh substrate with a mesh size of 0.05 g / m ² by an electrospinning method. A yarn having polypropylene (PP) / copolymerized PP (core-sheath structure) was produced by a melt spinning method. After producing a net with a loom so as to have a mesh of 24 × 36, the intersections of the warp and weft were fused by heat treatment. The net base material fused with the intersections was taped to the metal collector of the electrospinning apparatus and spun. The polymer solution used for electrospinning was prepared by dissolving a polycarbonate polyurethane resin in dimethylacetamide (DMAc) at a concentration of 15 wt% (see FIG. 11 (a)). Sample 1 is an example (Example 1).

(1-2) Sample 2
Sample 2 was prepared in the same manner as in Sample 1 except that spinning was performed directly on the mesh substrate with a basis weight of 0.10 g / m ² (see FIG. 11 (b)). Sample 2 is an example (Example 2).

(1-3) Sample 3
Sample 3 was prepared in the same manner as in Sample 1 except that spinning was performed directly on the net substrate with a basis weight of 0.15 g / m ² (see FIG. 11 (c)). Sample 3 is an example (Example 3).

(1-4) Sample 4
Sample 4 was prepared in the same manner as in Sample 1 except that spinning was performed directly on the net substrate with a basis weight of 0.20 g / m ² (see FIG. 11 (d)). Sample 4 is an example (Example 4).

(1-5) Sample 5
Sample 5 was prepared in the same manner as in Sample 4 except that a mesh substrate having a mesh number of 24 × 33 was used. Sample 5 is an example (Example 5).

(1-6) Sample 6
Sample 6 was prepared in the same manner as in Sample 4 except that the nanofiber layer was formed by the electrospinning method and then heat-treated by thermal calendar processing at 140 ° C. Sample 6 is an example (Example 6).

(1-7) Sample 7
Sample 7 was prepared in the same manner as in Sample 6 except that a net base material in which the intersections of the warp and weft were not welded was used as the net base material. Sample 7 is an example (Example 7).

(1-8) Sample 8
Sample 8 was prepared in the same manner as in Sample 4 except that a mesh base material having a mesh number of 24 × 24 was used. Sample 8 is a comparative example (comparative example 1).

(1-9) Sample 9
Sample 9 was prepared in which the nanofiber layer was not attached to the mesh substrate having a mesh number of 24 × 36 mesh (see FIG. 11 (e)). Sample 9 is a comparative example (comparative example 2).

(1-10) Sample 10
The net base material (black net and nanofiber layer not attached) used in a commercially available screen door was used as it was as sample 10. Sample 10 is a comparative example (comparative example 3).

(1-11) Sample 11
The net base material used for the commercially available screen door (cross cabin of Suminoe Textile Co., Ltd., cross cabin is a registered trademark of Teijin Frontier Co., Ltd.) was used as the sample 11 as it was. Sample 11 is a comparative example (comparative example 4).

(1-12) Sample 12
A polypropylene non-woven fabric (with a pollen collection efficiency of 99%) prepared by the melt blow method was used as sample 12. Sample 12 is a comparative example (comparative example 5).

(2) Performance test and its results Each of the above samples was subjected to the following performance test.

(2-1) Pollen Collectability Test A pollen collection property test was performed on Samples 1 to 4 and 9 by the following test method (see FIG. 12).

<Test method>
With the test system sucked at a constant air flow rate, the test powder (pollen substitute particles) sized by the sizing device is flowed from the upstream side of the filter unit at a constant speed. The mass of particles captured by the filter unit and the mass of particles that have passed through the filter unit are measured, and the collection (filtration) efficiency of pollen particles is calculated from the following formula (1). When the collection efficiency of the pollen particles is 80% or more, "◎: pollen collection property is very high", and when 50% or more and less than 80%, "○: pollen collection property is high", 50. If it is less than%, it is evaluated as "x: low pollen collection ability".

Pollen particle collection efficiency = B / A ... Equation (1)

However, A is "mass of particles captured by the filter unit (mg) + mass of particles that have passed through the filter unit (mg)", and B is "mass of particles captured by the filter unit (mg)". is there.

The test conditions are as follows.
・ Test powder (pollen particles): Matsuko Ishi (APPIE standard powder)
・ Test flow rate: 28.3L / min
・ Test powder amount: 75 ± 5 mg
・ Test powder rate: 20 ± 5 mg / min
・ Temperature and humidity of the test room: 20 ± 5 ℃, 50 ± 10% RH
[General Incorporated Association Japan Sanitary Materials Industry Association National Mask Industry Association Regulation Test Method Applicable]

<Test result>
As a result of the above pollen collection test, the collection efficiency of pollen particles was 59.7% (evaluation result ○) for sample 1 and 82.0% (evaluation result ◎) for sample 2. Sample 3 was 91.0% (evaluation result ⊚), sample 4 was 95.2% (evaluation result ⊚), and sample 9 was 25.4% (evaluation result ×). Since it was originally known that the pollen collection performance of sample 10 was low, no test was conducted, but the evaluation result was set to "x". Further, since it was originally known that the sample 11 and the sample 12 had high pollen collection performance, the test was not conducted, but the evaluation result was “⊚”. The result is shown in FIG.

(2-2) Air permeability test Samples 1 to 4, 9 and 10 were subjected to an air permeability test by the following test method.

<Test method>
JIS L 1096 (general woven fabric test) A breathability test was conducted by a method compliant with the Frazier form method. The pressure difference at that time was 12 Pa (wind that allows the twigs to move (3.4 to 5.4 m / s)).

The test procedure is as follows.
1. 1. Adjust 5 test pieces of about 200 mm × 200 mm and attach them to the Frazier type tester.
2. 2. Obtain the amount of air (cm3 / cm2 · s) that passes when the pressure difference is 12 Pa.
3. 3. When this amount of air is 50% or more of the amount of air obtained for the sample 10, "⊚: very high air permeability", and when 30% or more and less than 50%, "○: high air permeability", 30 If it is less than%, it is evaluated as "x: low air permeability".

<Test result>
As a result of the above air permeability test, the amount of air passing through when the pressure difference is 12 Pa is 388.2 cc / cm / sec (evaluation result ◎) for sample 1 and 277.4 cc / cm / sec for sample 2. (Evaluation result ◎), 183.4 cc / cm / sec for sample 3 (evaluation result ◎), 153.6 cc / cm / sec for sample 4 (evaluation result ○), and sample 9 It was 523.6 cc / cm / sec (evaluation result ⊚), and for sample 10, it was 472.9 cc / cm / sec (evaluation result ⊚). Since it was known that the samples 11 and 12 had low air permeability, the test was not conducted, but the evaluation result was “x”. The result is shown in FIG.

(2-3) Viewability test The viewability test was performed on the samples 1 to 4 and 9 to 11 by the following test method.

<Test method>
A test piece cut into a 15 cm square was taped to the window glass, and the viewability of the test piece area when the outdoor was viewed in the daytime in fine weather from a room 2 m away from the window was evaluated on a 4-point scale.
×: It is difficult to understand the state of the outside △: The state of the outside is blurred ○: The state of the outside is understood ◎: The state of the outside is well understood

<Test result>
As a result of the above viewability test, the viewability is "◎" for sample 1, "◎" for sample 2, "◎" for sample 3, and "○" for sample 4. Yes, sample 9 was "⊚", sample 10 was "◎", sample 11 was "Δ", and sample 12 was "x". The result is shown in FIG.

(2-4) Test for confirming the presence or absence of strike-through phenomenon in the nanofiber layer For Samples 4, 7 and 8, a "test for confirming the presence or absence of strike-through phenomenon in the nanofiber layer" was performed by the following test method.

<Test method>
In the "test for confirming the presence or absence of strike-through phenomenon of the nanofiber layer", specifically, the net base material is attached to the metal collector with tape, and the nanofibers are sprayed on the net base material by the electrospinning method. When the net base material was removed from the metal collector, it was confirmed whether or not the nanofibers passed through the mesh of the net base material and adhered to the metal collector. As a result, when the nanofibers are not attached to the metal collector, a rating of "○ as not strike-through" is given, and when the nanofibers are attached to the metal collector, "x is assumed to be strike-through". Gave the rating.

<Test result>
As a result of the above test, the samples 4 and 7 were "○", and the sample 8 was "x". The result is shown in FIG.

(2-5) Adhesion Test of Nanofiber Layer to Net Substrate The "adhesion test of nanofiber to net substrate" was performed on Samples 4, 7 and 8 by the following test method.

<Test method>
The "adhesion test of nanofibers to the net substrate" was performed by suction with a vacuum cleaner. The vacuum cleaner used was IC-C100-W Cyclone Cleaner Compact, made by Iris Ohyama. The test piece was cut into 15 cm squares. The test piece was fixed to a metal plate, the floor head of the vacuum cleaner was removed, and suction was performed with a pipe. The suction port of the pipe was fixed at a distance of 10 mm from the test piece. It was confirmed whether or not the nanofiber layer was peeled from the net base material. If the nanofiber layer is not peeled off from the net base material, a rating of "○" is given as "high adhesion", and if the nanofiber layer is peeled off from the net base material, "x" is given as "low adhesion". Gave a rating.

<Test result>
As a result of the above test, the samples 4 and 7 were "○", and the sample 8 was "x". The result is shown in FIG.

(3) Comprehensive Evaluation As a result, among the samples, Samples 1 to 7 (building material nets within the scope of claim 1, Examples 1 to 7) have pollen collection property, air permeability, viewability, and do not show through. It was found that the net was excellent in all performances and adhesiveness for building materials.

In Sample 8, a strike-through phenomenon of nanofibers was observed, and it was confirmed that the adhesion of nanofibers to the net base material was low, but even when the same net base material as in Sample 8 was used. By forming the nanofiber layer into a nanofiber layer made of nanofibers (for example, 3000 μm) having a fiber diameter larger than that of sample 8, there is no strike-through phenomenon of the nanofibers, and the nanofibers adhere to the net substrate. It has been confirmed that it is possible to manufacture nets for building materials with high properties.

Although the building material net of the present invention and the manufacturing method thereof have been described above based on the above-described embodiment, the present invention is not limited to this, and can be carried out within a range that does not deviate from the gist thereof. For example, the following modifications are also possible.

(1) The dimensions, shapes, and materials of each element shown in each of the above embodiments are examples, and the present invention is not limited thereto. It can be arbitrarily determined without departing from the gist of the present invention.

(2) In each of the above embodiments, a normal nanofiber layer that is not particularly colored is used as the nanofiber layer, but the present invention is not limited thereto. For example, black nanofibers can be used as the nanofibers. When black nanofibers are used as the nanofibers, the nanofiber layer becomes inconspicuous, and the net becomes a building material net with even better visibility. In this case, as a method for producing black nanofibers, a method of adding a black pigment to a nanofiber pigment-containing solution for producing nanofibers, a method of dyeing nanofibers with a black solution, and a monomer constituting the nanofibers. A method of introducing a black coloring group or the like can be preferably used.

(3) In each of the above embodiments, as the warp and weft, a sheath member made of a second resin having a melting point lower than that of the first resin is coated around a core member made of the first resin having a predetermined melting point. Although the one having a core-sheath structure is used, the present invention is not limited to this. For example, as the warp and weft, those having a core-sheath structure in which a resin-made sheath member is coated around a glass fiber core member can also be used.

(4) In the above embodiment, as the net base material, net base materials (24 mesh × 36 mesh, 24 mesh × 33 mesh) having different numbers of meshes in the warp direction and the weft direction were used. The purpose of this is to ensure the adhesion of nanofibers to the mesh substrate on the side with a large number of meshes (fine mesh) and to ensure breathability and viewability on the side with a small number of meshes (coarse mesh). Is. However, the present invention is not limited to this. For example, as the net base material, a net base material having the same number of meshes in the warp direction and the weft direction (for example, 30 mesh × 30 mesh, 33 mesh × 33 mesh, 36 mesh × 36 mesh, etc.) is used. You can also do it. By doing so, it is possible to secure the adhesiveness, air permeability and viewability of the nanofibers to the net base material.

(5) In the present invention, whichever of the number of meshes in the warp direction and the weft direction may be larger (mesh mesh is coarser).

(6) In the above embodiment, it has been explained that the building material net of the present invention is excellent in pollen collecting property, but the building material net of the present invention is also excellent in volcanic ash collecting property. Further, by increasing the basis weight of the nanofiber layer, it is possible to obtain a net for building materials having a high collection property against dust, dust, or environmental pollutants such as PM2.5.

(7) In each of the above embodiments, the building material net of the present invention has been described using the building material net used for the screen of the screen door, but the present invention is not limited thereto. For example, the building material net of the present invention can also be used as a vent.

1 ... Building material net, 2 ... Net base material, 3 ... Warp, 4 ... Weft, 5 ... Intersection, 6 ... Nanofiber layer, 7 ... Nanofiber, 10,10a, 10b ... Electrospinning device, 11 ... Tank, 12 Polymer solution, 13 ... valve, 14 ... electrospinning nozzle, 15 ... metal collector, 16 ... drawer roll, 17 ... take-up roll, 18, 19 ... heating device

Claims (11)

A net base material composed of warp threads (warp threads) and weft threads (weft threads) at which the intersections of the warp threads and the weft threads are welded.
It is provided with a nanofiber layer in which nanofibers are attached to the net base material without using an adhesive.
The mesh base material has a mesh number having a roughness that prevents the nanofibers from strike-through when the nanofibers are attached to the net base material, and has a fiber diameter of the warp yarn and a fiber of the weft yarn. All diameters are in the range of 0.10 mm to 0.30 mm.
The nanofiber layer has a feature that the average fiber diameter of the nanofibers in the range of 300Nm～3000nm, and basis weight is in the range of 0.05g ^{/ m 2} ~0.5g ^/ m 2 Net for building materials. The net for building materials according to claim 1, wherein the net base material has a number of meshes in the range of 24 meshes to 44 meshes in both the warp direction and the weft direction. The net for building materials according to claim 1 or 2, wherein the net base material has 28 meshes or more in at least one of the direction and the weft direction. The net for building materials according to any one of claims 1 to 3, wherein the nanofiber is made of a poorly hydrolyzable resin. The net for building materials according to any one of claims 1 to 3, wherein the nanofiber is made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin. The net for building materials according to any one of claims 1 to 5, wherein the nanofibers are black nanofibers. Both the warp and the weft have a core-sheath structure in which a core member made of a first resin having a predetermined melting point is coated with a sheath member made of a second resin fat having a melting point lower than that of the first resin. The building material net according to any one of claims 1 to 6, wherein the net has. The invention according to any one of claims 1 to 6, wherein both the warp and the weft have a core-sheath structure in which a resin-made sheath member is coated around a glass fiber core member. Net for building materials. A net base material composed of warp threads (warp threads) and weft threads (weft threads) in which the intersections of the warp threads and the weft threads are welded, and the fiber diameters of the warp threads and the weft threads are both 0.10 mm or more. A net base material preparation step for preparing a net base material within a range of 0.30 mm, and
Using electrospinning method, on one surface of the network substrate, the average fiber diameter is from nanofibers that are within the scope of 300Nm～3000nm, basis weight 0.05g ^{/ m 2} ~0.5g ^/ m 2 Including a nanofiber layer forming step of forming a nanofiber layer within the range of
The net base material preparation step is characterized in that a net base material having a number of meshes having a roughness that does not allow the nanofibers to strike through when the nanofibers are attached to the net base material is prepared. Manufacturing method of net for building materials. The method for producing a net for building materials according to claim 8, further comprising a heat treatment step for increasing the adhesive force between the net base material and the nanofiber layer after the nanofiber layer forming step. A net base material composed of warp threads (warp threads) and weft threads (weft threads) in which the intersections of the warp threads and the weft threads are not welded, and the fiber diameters of the warp threads and the weft threads are both 0.10 mm or more. A net base material preparation step for preparing a net base material within a range of 0.30 mm, and
Using electrospinning method, on one surface of the network substrate, the average fiber diameter is from nanofibers that are within the scope of 300Nm～3000nm, basis weight 0.05g ^{/ m 2} ~0.5g ^/ m 2 The nanofiber layer forming step of forming the nanofiber layer within the range of
It includes a heat treatment step for welding the intersection of the warp and the weft and increasing the adhesive force between the net base material and the nanofiber layer.
The net base material preparation step is characterized in that a net base material having a number of meshes having a roughness that does not allow the nanofibers to strike through when the nanofibers are attached to the net base material is prepared. Manufacturing method of net for building materials.