WO2020179390A1

WO2020179390A1 - Netting for building material use and manufacturing method for same

Info

Publication number: WO2020179390A1
Application number: PCT/JP2020/005460
Authority: WO
Inventors: 圭渡邊; 道大澤; 淳子川久保; 晃造松本; 山田　司; 幸久高山
Original assignee: 株式会社ナフィアス
Priority date: 2019-03-01
Filing date: 2020-02-13
Publication date: 2020-09-10
Also published as: CN112154252A; JP2020139360A; JP7228187B2

Abstract

Provided is netting for building material use with excellent pollen capturing properties and with air permeability and view properties superior to conventional screens. The netting for building material use 1 comprises a screen substrate 2 that is made from warp threads 3 and weft threads 4 and for which the intersection point 5 of the warp threads 3 and weft threads 4 are bonded, and a nano fiber layer 6 in which nano fibers 7 adhere to the netting substrate 2 without an adhesive. The screen substrate 2 has a coarse mesh count that does not allow the nano fibers 7 to penetrate when depositing the nano fibers 7 on the screen substrate 2, and the fiber diameter of the warp threads 3 and the fiber diameter of the weft threads 4 are both within the range of 0.10 mm to 0.30 mm. The nano fibers 7 in the nano fiber layer 6 have an average fiber diameter within the range of 300 nm to 3000 nm and a basis weight in the range of 0.05 g/m² to 0.5 g/m².

Description

Building material net and its manufacturing method

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

Hay fever is now a national disease, and the pollinosis rate in the Tokyo metropolitan area is 47%. 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 take measures to prevent the opening of windows.

However, if you take a measure that "do not open the window", that is, "do not ventilate", the air will become dirty. As the airtightness of houses increases, air pollution by chemical substances is more likely to occur, and when the humidity is high, bacteria, molds 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 so as pollutants such as carbon, carbon dioxide and nitrogen oxides are released. 95% of people with hay fever develop from February to May. This time overlaps with the epidemic of colds and influenza, so ventilation is also very important. Is a problem. Therefore, a window (screen door) capable of ventilation while preventing the invasion of pollen into the room has been proposed and sold (for example, see 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.

JP, 2014-47474, A

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 in better breathability and viewability than conventional screen doors.

[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. A nanofiber layer in which nanofibers are attached to a material, and the mesh base material has a mesh number of roughness such that the nanofibers do not strike through when the nanofibers are adhered to the mesh 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 nanofiber layer may be too coarse to obtain a sufficiently high pollen collection rate. If the basis weight of the nanofiber layer is greater than 0.5 g/m ² , the This is because the fiber layer may be too fine to obtain sufficient breathability and viewability. From these viewpoints, the basis weight of the nanofiber layer is preferably greater than 0.08 g/m ^{2, and} more preferably greater than 0.10 g/m ² . The basis weight of the nanofiber layer is preferably smaller than 0.4 g/m ^{2, and} 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 mesh base material is a mesh base material having a mesh number of roughness such that the nanofibers strike through when the nanofibers are attached to the mesh base material, the nanofibers for the mesh base material 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 in the case of a net base material, sufficient mechanical strength may not be obtained, 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 net for building materials of the present invention, the average fiber diameter of nanofibers is set in the range of 300 nm to 3000 nm because when the average fiber diameter of 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, if 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 has excellent pollen trapping properties, and is more breathable and has a better view than conventional screen doors.

It should be noted that 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 in 1 inch of mesh. 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 material according to the present invention, the mesh base material preferably has a mesh number within a 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. In some cases, sufficient breathability and viewability may not be obtained. From these viewpoints, the mesh number of the mesh base material is preferably larger than 26 mesh in both the warp direction and the weft direction, and more preferably larger than 28 mesh. 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 material according to the present invention, the mesh base material preferably has a mesh number of 28 mesh 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 material according to the present invention, it is preferable that the nanofibers are made of a hardly hydrolyzable resin.

The building material net of the present invention is a building material net 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.

The net for building materials of the present invention, in which the nanofibers are made of a polycarbonate-based polyurethane resin or a polyether-based polyurethane resin, the nanofibers are made of a hardly hydrolyzable resin, and the net for building materials has excellent weather resistance. .. In addition, 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, which can be used when assembling or using a net for building materials. It will be a strong net for building materials, in which nanofibers are not easily broken. Further, as described above, since the nanofibers are made of the polycarbonate-based polyurethane resin or the polyether-based polyurethane resin, the adhesive force between the net base material and the nanofibers becomes strong, which also makes it possible to assemble the net for building materials and It is a durable net for building materials in which nanofibers are not easily broken during use.

[6] In the net for building material according to the present invention, it is preferable that the nanofibers are black nanofibers.

The building material net of the present invention is a building material net with excellent visibility because the nanofibers are black, because the nanofibers are inconspicuous.

[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 is preferable that it has a core-sheath structure in which a fat-made sheath member is covered.

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 threads and the weft threads are welded. In this case, a mesh 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 copolymer polypropylene can be preferably used as the warp and the weft.

[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 the 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. Diameter and the diameter of the weft yarn are both within the range of 0.10 mm to 0.30 mm. A net base material preparing step of preparing a net base material, and one surface of the net base material using an electrospinning method. the average fiber diameter is from nanofibers in the range of 300 nm ~ 3000 nm, basis weight nanofiber layer formed for forming a nanofiber layer in the range of ^{^{0.05g / m 2 ~ 0.5g / m}} 2 In the mesh base material preparing step, a mesh base material having a mesh number of roughness such that the nanofibers do not strike through when the nanofibers are attached to the mesh base material is prepared in the mesh base material preparing step. It is characterized by

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 net for building materials suitable for producing the net for building materials 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 nanofiber are once melted or softened, and the adhesive force between the net base material and the nanofiber layer 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 building material according to the present invention is a net base material comprising warps (warps) and wefts (wefts), wherein the intersections of the warps and the wefts are not welded, and fibers of the warps. 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 in the range of 300 nm ~ 3000 nm, basis weight nanofiber layer formed for forming a nanofiber layer in the range of ^{^{0.05g / m 2 ~ 0.5g / m}} 2 And a heat treatment step for increasing the adhesion between the mesh base material and the nanofiber layer while welding the intersections of the warp and the weft, and in the mesh base material preparation 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 net for building materials suitable for producing the net for building materials 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 a principal part enlarged plan view of the net for building materials which concerns on Embodiment 1. FIG. 3 is a process drawing of the method for manufacturing a building material net according to the first embodiment. It is a figure which shows for demonstrating the net base material preparation process. It is a figure which shows for demonstrating the process of forming a nanofiber layer. FIG. 7 is a process drawing of the method for manufacturing a building material net according to the second embodiment. It is a figure shown in order to demonstrate a nanofiber layer formation process. FIG. 7 is a process drawing of the method for manufacturing a building material net according to the third embodiment. It is a figure which shows for demonstrating the net base material preparation process. It is a figure which shows for demonstrating the process of forming a nanofiber layer. 3 is a chart showing the specifications of each sample (Samples 1 to 12) used in the examples. FIG. 3 is an enlarged plan view of a main part of Samples 1 to 4 and 9. It is a figure shown in order to demonstrate a pollen collection property test. It is a chart which shows the test result for each sample.

The building material net of the present invention and a method for manufacturing the same will be described below in detail with reference to the embodiments shown in the drawings. 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 indispensable 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 diagrams showing the constituent elements of the invention are schematic diagrams, and do not necessarily represent the actual dimensions and ratios accurately.

[Embodiment 1]
1. Building Material Net FIG. 1 is an enlarged plan view of a main part of the building material net according to the first embodiment.
As shown in FIG. 1, the building material net 1 according to the first embodiment is composed of warp threads 3 (warp threads) and weft threads 4 (weft threads), and a net base material 2 in which the intersection 5 of the warp threads 3 and the weft threads 4 is welded. And the nanofiber layer 6 in which the nanofibers 7 are attached to the net base material 2 randomly or in a spider web shape without 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 300 nm ~ 3000 nm of the nanofiber 7, and a 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 nanofibers 7 are made of, for example, a polycarbonate polyurethane resin or a polyether polyurethane resin.

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

As shown in FIG. 2, the method for manufacturing a building material net according to the first embodiment includes a net base material preparing 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 nanofiber layer is formed, for example, randomly (or in a spider web shape). In FIG. 4, reference numeral 10 represents an electrospinning apparatus, reference numeral 11 represents a tank, reference numeral 12 represents a polymer solution, reference numeral 13 represents a valve, reference numeral 14 represents an electrospinning nozzle, and reference numeral 15 represents a metal. Reference numeral 16 denotes a collector, reference numeral 16 denotes a pulling roll, and reference numeral 17 denotes a winding roll.

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 hardly 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 becomes a net for building materials. In addition, 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/flexible resin, which can be used when assembling or using a net for building materials. It is a durable net for building materials, in which nanofibers are not easily broken. Further, as described above, since the nanofibers are made of the polycarbonate-based polyurethane resin or the polyether-based polyurethane resin, the adhesive force between the net base material and the nanofibers becomes strong. It is a durable net for building materials in which 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. It becomes the 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 yarn in the process of volatilizing after the solvent component adheres to the surface of the net yarn 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 drawing of the method for manufacturing a building material net according to the second embodiment. FIG. 6 is a diagram for explaining the nanofiber layer forming step.

The method for manufacturing the building material net according to the second embodiment basically includes the same steps as the method for manufacturing the building material net according to the first embodiment, but as shown in FIG. 5, the nanofiber layer forming step S12 After that, 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 by passing a net base material on which a nanofiber layer is formed through a pair of upper and lower heating rollers (thermal calendar processing). May be.

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. Therefore, it is possible to manufacture a net for building material in which the nanofiber layer is not easily peeled off.

[Third Embodiment]
7A to 7C are process diagrams in the method for manufacturing a building material net according to the third embodiment. FIG. 8: is a figure shown in order to demonstrate a net base material preparation process. FIG. 9: is a figure shown in order to demonstrate a nanofiber layer formation process.

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 yarn in the process of volatilizing after the solvent component adheres to the surface of the net yarn 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 essential parts of Samples 1 to 4 and 9. FIG. 12: is a figure shown in order to demonstrate a pollen collection property test. FIG. 13 is a chart showing the test results for each sample.

(1) Preparation of sample (1-1) Sample 1
A net having a 24×36 mesh warp and a weft intersecting at a fusion point made of a thread having a black polypropylene (PP)/copolymerized PP (core-sheath structure) having a fiber diameter of 0.15 mm is used as a net base material. A building material net was produced by directly spinning a polycarbonate-based polyurethane nanofiber (nanofiber) having a fiber diameter of 800 nm at a basis weight of 0.05 g/m ² onto a net base material by an electrospinning method. A yarn having polypropylene (PP)/copolymerized PP (core-sheath structure) was produced by a melt spinning method. A net was prepared by a loom so as to have a size of 24×36 mesh, and the intersections of the warp and the weft were fused by heat treatment. The mesh base material having the fused 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-based polyurethane resin in dimethylacetamide (DMAc) to a concentration of 15 wt% (see FIG. 11A). 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 the net weight was directly spun at 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 the net weight was directly spun at 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 the net weight was directly spun at 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 the net base material having a mesh number of 24×33 mesh was used. Sample 5 is an example (Example 5).

(1-6) Sample 6
Sample 6 was prepared in the same manner as Sample 4 except that the nanofiber layer was formed by the electrospinning method and then heat treatment was performed by thermal calendering 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 the mesh base material in which the intersections of the warp and the weft were not welded was used as the mesh 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 the mesh base material used had a mesh number of 24×24 mesh. Sample 8 is a comparative example (Comparative Example 1).

(1-9) Sample 9
Sample 9 was one in which the nanofiber layer was not attached to the net base material having a mesh number of 24×36 mesh (see FIG. 11E). Sample 9 is a comparative example (Comparative Example 2).

(1-10) Sample 10
A mesh base material (black net, no nanofiber layer is attached) used for a commercially available screen door was used as Sample 10 as it was. Sample 10 is a comparative example (Comparative Example 3).

(1-11) Sample 11
A net base material (a cross-cabin manufactured by Sumie Textile Co., Ltd., the cross-cabin is a registered trademark of Teijin Frontier Co., Ltd.) used for a commercially available screen door was used as Sample 11. Sample 11 is a comparative example (Comparative Example 4).

(1-12) Sample 12
Sample 12 was a polypropylene non-woven fabric (having a pollen collection efficiency of 99%) produced by the melt blow method. 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 Collecting Test A pollen collecting 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) that has been sized by the sizing device is caused to flow from the upstream side of the filter section at a constant speed. The mass of particles captured by the filter part and the mass of particles passing through the filter part 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. When it is less than %, it is evaluated as “×: Poor pollen collecting property”.

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): Ishimatsu (APPIE standard powder)
・Test flow rate: 28.3 L/min
・Test powder amount: 75±5mg
・Test powder speed: 20±5mg/min
・Temperature and humidity of test room: 20±5℃, 50±10%RH
[General Incorporated Association of Japan Sanitary Materials Industry Association, National Mask Industry Association, prescribed test method]

<Test results>
As a result of the pollen collecting test, the pollen particle collecting efficiency 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 ×). The sample 10 was not tested because the pollen collection performance was originally known to be low, but the evaluation result was “x”. Moreover, 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 set to “⊚”. The result is shown in FIG.

(2-2) Breathability test Samples 1 to 4, 9 and 10 were subjected to a breathability test by the following test method.

<Test method>
JIS L 1096 (General woven fabric test) Method A A breathability test was carried out according to the Frazier method. The pressure difference at that time was 12 Pa (wind (3.4 to 5.4 m/s) enough to move the twigs).

The test procedure is as follows.
1. Five test pieces of about 200 mm×200 mm are adjusted and attached to a Frazier type tester.
2. When the pressure difference is 12 Pa, the amount of air passing through (cm3/cm2·s) is calculated.
3. Then, when this air amount is 50% or more of the air amount obtained for the sample 10, "∘: very high air permeability", and when 30% or more and less than 50%, "○: high air permeability", 30 When it is less than %, it is evaluated as "x: low air permeability".

<Test results>
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 (evaluation result ◎) for sample 3, 153.6 cc / cm / sec (evaluation result ◯) for sample 4, and sample 9 523.6 cc/cm/sec (evaluation result ⊚), and sample 10 was 472.9 cc/cm/sec (evaluation result ⊚). In addition, since it was known that the sample 11 and the sample 12 had low air permeability, the test was not conducted, but the evaluation result was set to "x". The result is shown in FIG.

(2-3) Viewability test Samples 1 to 4 and 9 to 11 were subjected to a viewability test 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 outdoor situation △: The outdoor situation is blurred ○: The outdoor situation is visible ◎: The outdoor situation is well understood

<Test results>
As a result of the above-mentioned viewability test, the viewability is “◎” for sample 1, “◎” for sample 2, “◎” for sample 3, and “○” for sample 4. Yes, Sample 9 was “A”, Sample 10 was “A”, Sample 11 was “A”, and Sample 12 was “X”. The result is shown in FIG.

(2-4) Test for Confirming Presence or Absence of Strikethrough in Nanofiber Layer “

Samples

4, 7 and 8 were subjected to “test for confirming presence or absence of strikethrough in nanofiber layer” by the following test method.

<Test method>
The test to confirm the presence or absence of the strike-through phenomenon of the nanofiber layer is specifically, affixing the mesh base material to the metal collector with a tape and spraying the nanofibers on the mesh base material by the electrospinning method, When the mesh base material was removed from the metal collector, it was confirmed whether the nanofibers passed through the mesh of the mesh base material and adhered to the metal collector. As a result, when the nanofibers were not attached to the metal collector, a rating of “no strike-through was given” was given, and when the nanofibers were attached to the metal collector, “no strike-through was given x”. Gave a rating.

<Test results>
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

Base Material Samples

4, 7 and 8 were subjected to “adhesion test of nanofiber to net base material” by the following test method.

<Test method>
The “adhesion test of nanofibers on the mesh 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 a 15 cm square. 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 10 mm away from the test piece. It was confirmed whether the nanofiber layer was peeled from the mesh base material. When the nanofiber layer is not peeled from the net base material, a rating of “Excellent adhesiveness is given” is given, and when the nanofiber layer is peeled from the net base material, “As low adhesiveness is x” is given. Gave a rating.

<Test results>
As a result of the above test, the

samples

(3) Comprehensive evaluation As a result, among the samples, Samples 1 to 7 (building material nets falling within the scope of claim 1 and Examples 1 to 7) have pollen trapping properties, air permeability, viewability, and strikethrough. It was found that it is a net for building materials, which is excellent in all of the performance and the adhesiveness.

In Sample 8, the 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 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 a net for building materials with high properties.

The net for building materials of the present invention and the method for producing the same have been described above based on the above-described embodiment, but the present invention is not limited to this, and can be carried out without departing 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 spirit 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 to this. 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 having 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 color-forming group 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. However, 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 examples, as the net base material, net base materials (24 mesh×36 mesh, 24 mesh×33 mesh) having different mesh numbers 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, a mesh base material having the same number of meshes in the warp and weft directions (for example, 30 mesh×30 mesh, 33 mesh×33 mesh, 36 mesh×36 mesh, etc.) is used. You can also This also makes it 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, the building material net of the present invention has been described as being excellent in pollen trapping ability, but the building material net of the present invention is also excellent in volcanic ash trapping ability. In addition, by increasing the basis weight of the nanofiber layer, it is possible to make a net for building materials having a high ability to collect dust and dirt 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 to this. For example, the net for building material of the present invention can 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

A net base material composed of a warp (warp) and a weft (weft), in which an intersection of the warp and the weft is welded;
A nanofiber layer in which nanofibers are attached to the net base material without an adhesive,
The mesh base material has a mesh number of roughness such that the nano fiber does not strike through when the nano fiber is attached to the mesh base material, and the fiber diameter of the warp and the fiber of the weft. All the 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 300 nm ~ 3000 nm, and a basis weight is in the range of 0.05g / m 2 ~ 0.5g / m 2 Net for building materials.
The construction material net according to claim 1, wherein the mesh base material has a mesh number within a range of 24 mesh to 44 mesh in both the warp direction and the weft direction.
The construction material net according to claim 1 or 2, wherein the mesh base material has a mesh number of 28 mesh or more in at least one of a direction and a 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, characterized in that
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 preparing step of preparing a net base material within a range of 0.30 mm,
Using electrospinning method, on one surface of the network substrate, the average fiber diameter is from nanofibers in the range of 300 nm ~ 3000 nm, weight per unit area 0.05g / m 2 ~ 0.5g / m 2 A nanofiber layer forming step of forming a nanofiber layer within the range of
In the mesh base material preparing step, when the nanofibers are attached to the mesh base material, a mesh base material having a mesh number of roughness such that the nanofibers do not strike through 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 preparing step of preparing a net base material within a range of 0.30 mm,
Using electrospinning method, on one surface of the network substrate, the average fiber diameter is from nanofibers in the range of 300 nm ~ 3000 nm, weight per unit area 0.05g / m 2 ~ 0.5g / m 2 A nanofiber layer forming step of forming a nanofiber layer within the range of
A heat treatment step for increasing the adhesive force between the mesh base material and the nanofiber layer while welding the intersection points of the warp threads and the weft threads,
In the mesh base material preparing step, when the nanofibers are attached to the mesh base material, a mesh base material having a mesh number of roughness such that the nanofibers do not strike through is prepared. Manufacturing method of net for building materials.