JP2020056275A - Sound-proof wall - Google Patents

Abstract

To provide a sound-proof wall which is excellent in strength and can maintain high transparency when used outdoors for a long period of time.SOLUTION: A sound-proof wall comprises a photocurable resin layer containing glass fibers, and a fluororesin layer laminated on at least one surface side of the photocurable resin layer. The fluororesin layer has a transmittance of 380 nm at a wavelength of 30% or less measured by a spectrophotometer, and the sound-proof wall has a total light transmittance of 75% or more and a haze of 20% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to soundproofing walls, and more particularly to transparent soundproofing walls.

  2. Description of the Related Art As a soundproof wall installed on a railway, a highway, or the like, a soundproof wall made of transparent resin is known. By using a transparent resin soundproof wall, the scenery from drivers and passengers is protected.

  As a soundproof wall made of a transparent resin, for example, at least two or more transparent methacrylic resins are united or laminated with a room-temperature-curable polymerizable adhesive interposed therebetween, and are all light-transmitting. A transparent soundproof laminate having a ratio of 70 to 95%, a haze value of 0.1 to 20%, and a peak value of loss tangent (tan δ) at −20 to 70 ° C. of 0.2 to 1 is used as a material. A known soundproof wall is known (for example, see Patent Document 1). According to the document, the soundproof wall has high transparency and excellent visibility, exhibits excellent soundproof performance over a wide temperature range, and has improved weather resistance, impact resistance, penetration resistance, shatterproof performance, and the like. It is said that it is suitable as a material for a transparent soundproof wall for railways or roads because of its light weight.

JP-A-7-279128

  However, the present inventors have studied and found that the soundproof wall disclosed in Patent Literature 1 has a problem that it has insufficient strength and cannot maintain transparency when used outdoors for a long time. I learned.

  Therefore, an object of the present invention is to provide a soundproof wall which solves the above-mentioned problems, has excellent strength, and can maintain high transparency when used outdoors for a long time.

  The present inventors have studied in order to solve the above-described problems, and found that a glass fiber is used as a fiber for reinforcing a resin, and a resin having a refractive index similar to the refractive index of the glass fiber is used as a resin reinforced by the glass fiber. As a curable resin, this is photocured to form a glass fiber-containing photocurable resin layer so that the total light transmittance is 75% or more and the haze is 20% or less. It has been found that, for the first time, by laminating a resin layer, it is possible to achieve excellent strength and to maintain high transparency when used outdoors for a long time. The present invention is an invention that has been completed by intensive studies based on such knowledge.

That is, the present invention provides the following aspects of the invention.
Item 1. A photo-curable resin layer containing glass fibers, and a fluoro-resin layer laminated on at least one surface side of the photo-curable resin layer, a soundproof wall, wherein the fluoro-resin layer is a spectrophotometer A soundproof wall having a measured transmittance at a wavelength of 380 nm of 30% or less, a total light transmittance of the soundproof wall of 75% or more, and a haze of 20% or less.
Item 2. Item 2. The soundproof wall according to item 1, wherein the glass fiber is included as a glass fiber fabric, and the glass fiber fabric is included in the photocurable resin layer in 2 to 10 sheets.
Item 3. Item 3. The soundproof wall according to Item 2, wherein an aperture ratio of the glass fiber fabric is 15% or more and 30% or less.
Item 4. The fluororesin layer includes a PVDF-rich surface and an acrylic resin-rich surface, and a surface to be bonded to the photocurable resin layer is the acrylic resin-rich surface. The soundproof wall described in.
Item 5. Item 5. The soundproof wall according to any one of Items 1 to 4, having a tensile strength of 500 N / 25 mm or more.
Item 6. Item 6. The soundproof wall according to any one of Items 1 to 5, wherein the color difference ΔE * ab measured by the following method is 5 or less.
(Measuring method)
First, L * ₁ , a * _1, and b * ₁ of a sample in which the soundproof wall is cut into 7.5 cm × 15 cm are measured using a color difference meter “CR300” manufactured by Konica Minolta, Inc. Next, the sample was subjected to a 500-hour exposure test (black panel temperature: 63 ° C., humidity: 50%) using a sunshine weather meter (trade name: S80D, manufactured by Suga Test Instruments Co., Ltd.) as a device according to JIS K 7350-4. , Without water spray). Next, L * ₂ , a * ₂ , and b * ₂ of the exposed surface of the sample after the exposure test are measured using a color difference meter "CR300" manufactured by Konica Minolta, in the same manner as before the exposure test. Then, from the obtained L * ₁ , a * _1, and b * ₁ before the exposure test and L * ₂ , a * ₂ , b * ₂ after the exposure test, according to JIS Z 8730: 2009 7.1.1. ΔE * ab is calculated by the following equation.
ΔE * ab = [(L * ₁ -L * ₂ ) ² + (a * ₁ -a * ₂ ) ² + (b * ₁ -b * ₂ ) ² ] ^0.5
Item 7. Mass is 150~1000g / ^{m 2,} a thickness of 100～800Mm, soundproofing wall of any one of clauses 1-6.
Item 8. The soundproof wall according to any one of Items 1 to 7, which is installed outdoors.

  According to the soundproofing wall of the present invention, a lightproofing resin layer containing glass fibers, and a fluorine resin layer laminated on at least one surface side of the photocurable resin layer, the soundproofing wall, Since the fluororesin layer has a transmittance of 30% or less at a wavelength of 380 nm measured by a spectrophotometer, the total light transmittance of the soundproof wall is 75% or more, and the haze is 20% or less, the strength is low. It is possible to maintain excellent transparency when used outdoors for a long time.

It is a cross section schematic diagram explaining an example of the soundproof wall of the present invention.

  The soundproof wall of the present invention is a soundproof wall including: a photocurable resin layer containing glass fiber; and a fluororesin layer laminated on at least one surface side of the photocurable resin layer, The resin layer has a transmittance at a wavelength of 380 nm measured by a spectrophotometer of 30% or less, a total light transmittance of the soundproof wall of 75% or more, and a haze of 20% or less.

  FIG. 1 is a schematic cross-sectional view illustrating an example of the soundproof wall of the present invention. FIG. 1 illustrates a case where the glass fiber 2 is included as a glass fiber fabric which is a glass fiber cloth. As shown in FIG. 1, the soundproof wall 1 of the present invention is laminated on a glass fiber 2, a photocurable resin layer 3 containing the glass fiber 2, and at least one surface of the photocurable resin layer 3. It is a laminated structure including a fluororesin layer 4. In the soundproof wall 1 of the present invention, when the glass fiber 2 is included as a glass fiber cloth, at least one glass fiber cloth may be included, and a plurality of glass fiber cloths may be included. When the glass fiber 2 is included as a glass fiber cloth, the photocurable resin layer 3 is included in a state where the glass fiber cloth is impregnated. Specifically, the photocurable resin layer 3 fills the gap between the plurality of glass fibers 2 constituting the glass fiber cloth, and one surface side portion 31 of the photocurable resin layer 3 and the other side. It communicates with the front side portion 32 via the gap. When the glass fiber 2 is contained as a glass fiber cloth, it is preferable that the photocurable resin layer 3 portion where no glass fiber cloth is present is formed on both surfaces of the glass fiber cloth.

  Also, as shown in FIG. 1, the soundproof wall 1 of the present invention is laminated with the photocurable resin layer 3 and the fluororesin layer 4 in contact with each other (that is, the photocurable resin layer 3 and the fluororesin layer 4). 4 may be directly laminated), or another layer may be laminated between the photocurable resin layer 3 and the fluororesin layer 4. Further, as shown in FIG. 1, in the soundproof wall 1 of the present invention, the fluororesin layer 4 is preferably laminated on both sides of the photocurable resin layer 3.

Detail the composition of each layer constituting the sound barrier 1 of each layer of the composition present invention.

[Glass fiber 2]
The soundproof wall 1 of the present invention includes a glass fiber 2 in a photocurable resin layer 3. By using glass fiber as a component for reinforcing the resin layer, the soundproof wall 1 of the present invention can have excellent strength. The refractive index of the glass fiber 2 is set so as to be similar to the refractive index of the photo-curable resin layer 3 described below, whereby the sound-insulating wall 1 of the present invention described below has a total light transmittance of 75% or more and a haze. It can be 20% or less. In other words, the configuration in which the total light transmittance of the soundproof wall 1 of the present invention is 75% or more and the haze is 20% or less is that the refractive index of the glass fiber 2 and the refractive index of the photocurable resin layer 3 are at least equal to each other. This indicates that the difference is sufficiently close (for example, the difference between the refractive index of the glass fiber 2 and the refractive index of the photocurable resin layer 3 is 0.02 or less).

  In the present invention, examples of the form of the glass fiber 2 include a long fiber and a short fiber. Further, the glass fiber 2 is preferably present as a glass fiber cloth from the viewpoint of increasing the strength of the soundproof wall 1. Examples of the glass fiber cloth include a glass fiber cloth, a glass fiber knit, and a glass fiber nonwoven cloth. From the viewpoint of further increasing the transparency and strength of the soundproof wall 1, a glass fiber cloth is preferable. Examples of the structure of the glass fiber fabric include plain weave, satin weave, twill weave, slope weave, ridge weave, and the like. The weaving density of the glass fiber woven fabric is not particularly limited, but from the viewpoint of further achieving both transparency and strength, both the warp density and the weft density are preferably 20 to 100 yarns / 25 mm, and 25 to 70 yarns / 25 yarns. 25 mm is more preferable.

  The glass material of the glass fiber 2 is not particularly limited, and a known glass material can be used. Specific examples of glass materials include alkali-free glass (E glass), acid-resistant alkali-containing glass (C glass), high-strength and high-modulus glass (S glass, T glass, etc.), and alkali-resistant glass (AR Glass). Among these glass materials, preferably, alkali-free glass (E glass) having high versatility is used. The glass fiber 2 may be made of one type of glass material, or may be a combination of two or more types of glass fibers made of different glass materials.

  The single fiber diameter of the glass fiber 2 is, for example, 3 to 10 μm, and preferably 5 to 9 μm, more preferably 6 to 8 μm, from the viewpoint of further improving the transparency and strength of the soundproof wall 1. No. When the glass fiber 2 exists as a glass fiber woven fabric, the glass fiber 2 is preferably a glass fiber woven fabric using a glass yarn in which a plurality of single fibers that are long glass fibers are twisted together as a warp and a weft. The number of the single fibers in the glass yarn is, for example, 50 to 800, and preferably 200 to 800 from the viewpoint of further improving the transparency and strength of the soundproof wall 1. The count of the glass yarn is, for example, 4 to 200 tex, preferably 10 to 70 tex, and more preferably 17 to 30 dtex from the viewpoint of further improving the transparency and strength of the soundproof wall 1.

In the soundproof wall 1 of the present invention, the ratio of the mass (g / m ² ) of the glass fiber 2 to the total mass (g / m ² ) of the mass of the glass fiber 2 and the mass of the photocurable resin layer 3 described below (g / m ² ) The mass%) is preferably from 10 to 60 mass%, more preferably from 20 to 50 mass%, further preferably from 40 to 50 mass%, from the viewpoint of further improving the transparency and strength of the soundproof wall 1. Preferred are mentioned. The ratio (mass%) of the mass (g / m ² ) of the glass fiber 2 to the mass (g / m ² ) of the soundproof wall 1 of the present invention makes the soundproof wall 1 more compatible with transparency. From a viewpoint, 10 to 40 mass% is mentioned, and 20 to 35 mass% is more preferably mentioned. Moreover, as a mass (g / m ² ) of the glass fiber 2, from the viewpoint of further compensating the transparency and the strength of the soundproof wall 1, 20 to 500 g / m ² may be mentioned, and 50 to 300 g / m ² may be used. Preferred are mentioned. When the glass fiber 2 is present as a glass fiber cloth, the thickness per glass fiber cloth is not particularly limited, but for example, 20 to 500 μm, and the transparency and strength of the soundproof wall 1 are further improved. From the viewpoint of compatibility, 50 to 300 μm is preferably mentioned. When the glass fiber 2 is present as a glass fiber cloth, the mass (g / m ² ) per glass fiber cloth is not particularly limited, but for example, 20 to 500 g / m ² , and a soundproof wall. 20-150 g / m < ² > is mentioned preferably from a viewpoint of making the transparency and strength of 1 more compatible, 80-120 g / m < ² > is more preferable. When the glass fiber 2 is present as a glass fiber cloth, the number of the glass fiber cloths contained in the photo-curable resin layer 3 is not particularly limited. From the viewpoint of further achieving both transparency and strength, 2 to 5 sheets are preferred.

  When the glass fiber 2 is present as a glass fiber fabric, from the viewpoint of further improving the non-combustibility of the soundproof wall 1, the gap between adjacent warps in the glass fiber fabric is 0.5 mm or less and / or the glass It is preferable that the gap between adjacent wefts in the fiber woven fabric is 0.5 mm or less. The gap between adjacent warps and the gap between adjacent wefts in the glass fiber fabric are measured and calculated as follows.

<Method of measuring gap between adjacent warps and gap between adjacent wefts>
The glass fiber woven fabric is observed with a microscope from a plane direction, and the interval of the gap between adjacent warps is arbitrarily measured at 20 places. Then, the average value of the gaps between the adjacent warps at the 20 locations is defined as the gap (mm) between the gaps between the adjacent warps. The same applies to the gap between adjacent wefts, and the obtained average value is defined as the gap between adjacent wefts (mm).

  When the glass fiber 2 is made of a glass fiber fabric, the aperture ratio of the glass fiber fabric is not particularly limited, but may be, for example, 40% or less, so that the transparency and the nonflammability of the soundproof wall 1 can be more compatible. From a viewpoint, 3-30% is mentioned preferably. In addition, as described above, while including a plurality of glass fiber cloths, the opening ratio is set to 15% or more and 30% or less, more preferably more than 20% and 27% or less, so that the soundproof wall 1 is formed. And the improvement of strength can be more compatible with each other. In addition, the aperture ratio of the glass fiber fabric is calculated by the following equation (1).

  Opening ratio (%) = (Gap between adjacent warps (mm) × Gap between adjacent wefts (mm)) / [(25 ° warp density (number / 25 mm)) × (25 °) Weft density (book / 25mm)) x 100

  From the viewpoint of making the total light transmittance of the soundproof wall 1 of the present invention to be higher and lowering the haze to be described later, the absolute value of the difference between the refractive indices of the glass fiber 2 and the photocurable resin layer 3 to be described later. Is preferably 0.02 or less, more preferably 0.01 or less. Further, the refractive index of the glass fiber 2 is, for example, 1.52 to 1.58, and preferably 1.53 to 1.57.

  The measurement of the refractive index of the glass fiber 2 is performed according to the method B of JIS K7142: 2008. Specifically, first, the glass fiber 2 is ground to such an extent that a Becke line can be observed when the glass fiber 2 is observed at a magnification of 400 using an optical microscope. Then, using a halogen lamp provided with a D-line interference filter as a light source, observation and measurement were performed using an optical microscope under conditions of a magnification of 400 and a temperature of 23 ° C., and the average value of three tests was refracted. The value of the rate. The measurement of the refractive index of the photocurable resin layer 3 described later is performed according to the method B of JIS K7142: 2008. Specifically, the photocurable resin layer 3 is pulverized so that a Becke line can be observed when the photocurable resin layer 3 is observed with an optical microscope at 400 times magnification. Then, using a halogen lamp provided with a D-line interference filter as a light source, observation and measurement were performed using an optical microscope under conditions of a magnification of 400 and a temperature of 23 ° C., and the average value of three tests was refracted. The value of the rate.

[Photocurable resin layer 3]
The soundproof wall 1 of the present invention includes the photocurable resin layer 3 including the glass fiber 2 described above. As described above, the photocurable resin layer 3 is selected and adjusted so as to approximate the refractive index of the glass fiber 2, whereby the scattering of light on the surface of the glass fiber can be reduced, and the total light transmittance of 75% to be described later. As described above, the configuration can be such that the haze is 20% or less. Then, by using a photocurable resin as the resin containing the glass fiber 2, the photocurable resin can be obtained, and thereby the transparency can be further improved. That is, by light curing, the sound insulating wall 1 can have excellent surface smoothness, and can have excellent transparency.

  In the present invention, it is preferable that the photocurable resin layer 3 contains a photocurable resin that easily approximates the refractive index of the glass fiber 2. Examples of the photo-curable resin include resins that are cured by light such as ultraviolet light, and examples thereof include epoxy resins, unsaturated polyester resins, vinyl ester resins, urethane acrylate resins, fluorene acrylate resins, and acrylic resins (curable acrylic resins). ) And the like. Above all, it is preferable to use a curable acrylic resin from the viewpoint of improving the adhesiveness to the fluororesin layer 4 described later. Among the curable acrylic resins, those obtained by curing a resin composition containing an acrylic syrup are particularly preferable from the viewpoint of further improving the adhesiveness to the fluororesin layer 4. In the present invention, the acrylic syrup refers to a polymerizable liquid mixture obtained by dissolving a (meth) acrylate polymer such as polymethyl methacrylate (PMMA) in an acrylic monomer such as methyl methacrylate. Among the above acrylic syrups, one or more acrylate polymers selected from the group consisting of polymethyl methacrylate, methyl methacrylate / methyl acrylate copolymer, and methyl methacrylate / normal butyl acrylate copolymer are methacrylic. Acrylic syrup dissolved in a methyl acid monomer is particularly preferred.

  The photocurable resin layer 3 may further contain additives such as a flame retardant, a filler, and an antistatic agent, if necessary. Examples of the flame retardant include aluminum hydroxide, magnesium hydroxide, trichloroethyl phosphate, triallyl phosphate, ammonium polyphosphate, phosphate ester, and bromine-based flame retardants. Examples of the filler include calcium carbonate, silica, and talc. Examples of the antistatic agent include a surfactant and the like. Examples of the light diffusing agent include colloidal silica and transparent microspheres such as glass beads and acrylic beads. These additives may be used alone or in a combination of two or more.

  On the other hand, it is preferable that the photocurable resin layer 3 contains as little as possible an ultraviolet ray shielding agent (including an ultraviolet ray absorbent) for preventing the resin from discoloring or discoloring. That is, the present inventors examined the reason why the soundproof wall disclosed in Patent Literature 1 could not maintain transparency when used outdoors for a long period of time. They found that the material had deteriorated and transparency could not be maintained. Here, in general, in order to prevent deterioration such as discoloration of the resin, it is adopted to incorporate an ultraviolet shielding agent or the like into the resin. However, the present inventors have learned that, as described above, in order to obtain excellent transparency in a soundproof wall, it is necessary to use a photocurable resin as a resin containing glass fibers, and It has been found that if the photocurable resin contains an ultraviolet ray shielding agent in order to prevent discoloration or other deterioration, curing is inhibited, and the strength and transparency of the soundproof wall 1 may be poor. Therefore, in the soundproof wall 1 of the present invention, means for preventing the discoloration such as discoloration due to ultraviolet rays by incorporating an ultraviolet shielding agent into the resin is not adopted, and the photocurable resin layer 3 including the glass fiber 2 is replaced with a fluororesin layer described later. By laminating the photocurable resin layer 4 and having the ultraviolet ray shielding performance, the photocurable resin layer 3 is prevented from discoloration and the like due to ultraviolet rays, and the transparency is maintained when the photocurable resin layer 3 is used outdoors for a long time. is there. For this reason, it is preferable that the photocurable resin layer 3 does not contain an ultraviolet shielding agent as much as possible.

  Examples of the ultraviolet shielding agent include known agents having an action of converting light energy into heat energy, and may be, for example, any of an organic type and an inorganic type, and if the type is an organic type, for example, a benzophenone type. And benzotriazole-based, triazine-based, cyanoacrylate-based, oxalidide, salicylate-based, and acrylic-based ultraviolet shielding agents, and specifically, 2- (2'-hydroxy-5'-methyl-phenyl). ) Benzotriazole, 2- (2'-xanthencarboxy-5'-methylphenyl) benzotriazole, 2- (2'-o-nitrobenzyloxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy -3'-t-butyl5'-methyl-phenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy 3 ', 5'-di-t-butyl-phenyl) -5-chlorobenzotriazole, 2- (2'hydroxy-4'-n-octoxy-phenyl) benzotriazole, 2- (2'-hydroxy-5' -T-octyl-phenyl) benzotriazole, 2- {2'-hydroxy-3,5-di (1,1-dimethylbenzyl) phenyl} -2H-benzotriazole, 2- (3 ', 5'-di- t-butyl-2'-hydroxyphenyl) benzotriazole, 2- (3'-tert-butyl-5'-methyl-2'-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3 ', 5'- Di-t-amyl-2'-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-butylphenyl) benzotriazole, 2- (2'-4'-di Benzotriazole compounds such as (droxyphenyl) benzotriazole; 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy -4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, 2-hydroxy -4-dodecyloxybenzophenone, 2-xanthenecarboxy-4-dodecyloxybenzophenone, 2-o-nitrobenzyloxy-4-dodecyloxybenzophenone, 2-hydroxy-4-benzoxybenzophenone, 2-hydroxy-4 − Benzophenones such as methoxy-2'-carboxybenzophenone; benzophenones such as phenyl salicylate, p-octylphenyl salicylate and pt-butylphenyl salicylate; N- (2-ethoxyphenyl) -N '-(4-isododecyl) Oxalic acid anilide derivatives such as phenyl) ethanediamide and N- (2-ethoxyphenyl) -N '-(2-ethyl) ethanediamide; 2- [4-{(2-hydroxy-3-dodecyloxypropyl) oxy} -2 -Hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-{(2-hydroxy-3-tridecyloxypropyl) oxy} -2- Hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine Trioctane derivative; octyl 2-cyano-3,3'-diphenylacrylate, ethyl 2-cyano-3,3'-diphenylacrylate, 2-cyano-3-phenyl-3- (3,4-dimethylphenyl) Acrylic acid- (2-ethylhexyl), 2-cyano-3- (p-methoxyphenyl) -3- (3,4-dimethylphenyl) acrylic acid- (2-ethylhexyl), p-methoxy-α- (3, UV-screening agents containing unsaturated nitrile groups such as 4-xylyl) benzylidenemalononitrile. The content of these ultraviolet shielding agents in the photocurable resin layer 3 is 0 to 3% by mass, preferably 0 to 1% by mass, and 0% by mass (does not contain an ultraviolet shielding agent). Are more preferred.

In the soundproof wall 1 of the present invention, the content of the photocurable resin in the photocurable resin layer 3 is not particularly limited, but is, for example, 60 to 100% by mass, and preferably 80 to 100% by mass. Can be In the soundproof wall 1 of the present invention, the mass of the photocurable resin layer 3 (excluding the mass of the glass fiber 2) is preferably, for example, 30 to 500 g / m ^{2, and} is preferably 30 to 300 g / m ^2. Are more preferred. In the soundproof wall 1 of the present invention, the thickness of the photocurable resin layer 3 including the glass fiber 2 is not particularly limited, but is, for example, 30 to 500 μm, and more preferably 30 to 300 μm. Further, in the soundproof wall 1 of the present invention, the photocurable resin layer 3 may include one layer as shown in FIG. 1 or may include a plurality of layers.

  The refractive index of the photocurable resin layer 3 is, for example, 1.52 to 1.58, and preferably 1.53 to 1.57.

[Fluororesin layer 4]
The soundproof wall 1 of the present invention is laminated on at least one surface of the photocurable resin layer 3 described above. Further, as exemplified in FIG. 1, the fluororesin layer 4 is preferably laminated so as to be the outermost surface layer. The fluororesin layer 4 has a transmittance of 30% or less at a wavelength of 380 nm measured by a spectrophotometer. As described above, since the fluororesin layer 4 having the ultraviolet shielding performance is laminated, the photocurable resin layer 3 is prevented from being discolored or deteriorated by ultraviolet rays, and the light containing the glass fibers 2 when used outdoors for a long period of time. By setting the curable resin layer 3, high transparency that can be exhibited can be maintained.

  In the present invention, the fluororesin is a polymer (a homopolymer or a copolymer) having a repeating unit derived from at least one type of fluorine-containing monomer, for example, polyvinylidene fluoride (PVDF), Vinyl fluoride (PVF), polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene / perfluoroalkyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP) ), Ethylene / tetrafluoroethylene copolymer (ETFE), ethylene / tetrafluoroethylene / hexafluoropropylene copolymer, vinylidene fluoride / tetrafluoroethylene copolymer, vinylidene fluoride / hexafluoropropylene copolymer, fluorine Plasticized vinyl Den / pentafluoropropylene copolymer, tetrafluoroethylene / hexafluoropropylene / vinylidene fluoride copolymer (THV), vinylidene fluoride / pentafluoropropylene / tetrafluoroethylene copolymer, vinylidene fluoride / perfluoroalkyl vinyl ether / Tetrafluoroethylene copolymer, ethylene / chlorotrifluoroethylene copolymer (ECTFE), and vinylidene fluoride / chlorotrifluoroethylene copolymer. These fluororesins may be used alone or in a combination of two or more. Among these fluororesins, from the viewpoint of providing the sheet 1 of the present invention with more excellent transparency, it may contain at least one compound selected from the group consisting of PCTFE, PFA, FEP, ETFE, and PVDF. ETFE and PVDF are more preferable from the viewpoint of weather resistance and flexibility.

  From the viewpoint of further improving the adhesiveness between the fluororesin layer 4 and the photocurable resin layer 3, the fluororesin layer 4 preferably contains PVDF and an acrylic resin. Examples of the acrylic resin include poly (methyl) acrylate (PMMA), ethyl poly (meth) acrylate, propyl poly (meth) acrylate, butyl poly (meth) acrylate, and methyl (meth) acrylate. (Meth) butyl acrylate copolymer, (meth) ethyl acrylate- (meth) butyl acrylate copolymer, ethylene- (meth) methyl acrylate copolymer, styrene- (meth) methyl acrylate copolymer And the like, and resins made of a homo- or copolymer containing a (meth) acrylate. Among them, PMMA is preferable from the viewpoint of further improving the adhesiveness with the photocurable resin layer 3.

  From the viewpoint of further exhibiting the weather resistance by PVDF and the adhesiveness of the acrylic resin to the photocurable resin layer 3, the fluororesin layer 4 has a PVDF-rich surface (that is, a PVDF content of 51% by mass or more). It is preferable that the surface containing an acrylic resin-rich surface (that is, the acrylic resin content is 51% by mass or more) and the surface to be bonded to the photocurable resin layer 3 is the acrylic resin-rich surface. The mass ratio (PVDF: acrylic resin) of PVDF to acrylic resin on the PVDF-rich surface is, for example, preferably 51:49 to 95: 5, and more preferably 60:40 to 90:10. Further, as the mass ratio of PVDF and acrylic resin (PVDF: acrylic resin) on the acrylic resin-rich surface, for example, 5:95 to 49:51 is preferable, and 10:90 to 40:60 is more preferable. . As described above, the fluororesin layer 4 includes a PVDF-rich surface (that is, a PVDF content of 51% by mass or more) and an acrylic resin-rich surface (that is, an acrylic resin content of 51% by mass or more). Is an alloy of PVDF and an acrylic resin, for example, a sheet A having a PVDF content of 51% by mass or more and a sheet B having an acrylic resin content of 51% by mass or more are prepared. There is a method of bonding the sheet A and the sheet B.

  The fluororesin layer 4 has a transmittance at a wavelength of 380 nm measured by a spectrophotometer of 30% or less, preferably 20% or less, more preferably 15% or less, and even more preferably 10% or less. This prevents deterioration of the photocurable resin layer 3 such as discoloration due to ultraviolet rays, and maintains high transparency that can be exhibited by using the photocurable resin layer 3 containing the glass fiber 2 when used outdoors for a long period of time. Can be achieved. Specifically, the transmittance is measured using a spectrophotometer U-4000 manufactured by Hitachi High-Tech Science Corporation.

  In order to make the fluororesin layer 4 have the above-mentioned transmittance, the resin composition constituting the fluororesin layer 4 may contain an ultraviolet shielding agent. The ultraviolet shielding agent also includes an ultraviolet absorber.

  As the ultraviolet ray shielding agent, in addition to the above-mentioned ultraviolet ray shielding agent, for example, a metal ultraviolet ray shielding agent, a metal oxide ultraviolet ray shielding agent, a benzotriazole ultraviolet ray shielding agent, a benzophenone ultraviolet ray shielding agent, a triazine ultraviolet ray shielding agent, malon Acid ester-based ultraviolet shielding agents, oxalic acid anilide-based ultraviolet shielding agents, benzoate-based ultraviolet shielding agents, and the like. From the viewpoint of further improving transparency, benzotriazole-based ultraviolet shielding agents, benzophenone-based ultraviolet shielding agents, and triazine-based ultraviolet shielding agents. Preferred are an ultraviolet shielding agent, a malonic ester ultraviolet shielding agent, an oxalic anilide ultraviolet shielding agent, and a benzoate ultraviolet shielding agent. The content (% by mass) of the ultraviolet shielding agent in the fluororesin layer 4 is not particularly limited, but is, for example, 1 to 10% by mass, and 3 to 8% by mass. These ultraviolet shielding agents may be kneaded into the fluororesin layer 4 or may be applied to the surface of the fluororesin layer 4.

The mass per one layer of the fluororesin layer 4 is not particularly limited, but is preferably, for example, 22 to 435 g / m ^{2, and} more preferably 22 to 200 g / m ² , from the viewpoint of achieving both transparency and strength. ² is more preferred. The thickness of one layer of the fluororesin layer 4 is not particularly limited, but is, for example, preferably 12.5 to 500 μm, and more preferably 12.5 to 250 μm.

  The total light transmittance of one layer of the fluororesin layer 4 is preferably 80% or more, more preferably 85 to 98%, further preferably 90 to 96%. The haze per layer of the fluororesin layer 4 is preferably 15% or less, more preferably 1 to 10%, and further preferably 2 to 8%. The total light transmittance of the fluororesin layer 4 is a value measured according to JIS K7361-1: 1997, and the haze is a value measured according to JIS K7136: 2000.

[Characteristics of soundproof wall 1]
<Total light transmittance, haze>
The soundproof wall of the present invention has a total light transmittance of 75% or more and a haze of 20% or less. As described above, the configuration in which the total light transmittance of the soundproof wall 1 of the present invention is 75% or more and the haze is 20% or less is at least the refractive index of the glass fiber 2 and the refractive index of the photocurable resin layer 3. (For example, the difference between the refractive index of the glass fiber 2 and the refractive index of the photocurable resin layer 3 is 0.02 or less). The total light transmittance is preferably 80% or more, more preferably 85% or more, and further preferably 88% or more. The haze is preferably 15% or less, more preferably 10% or less, and further preferably 6% or less. In the present invention, the total light transmittance of the soundproof wall 1 is a value measured according to JIS K7361-1: 1997, and the haze is a value measured according to JIS K7136: 2000.

<Evaluation of strength>
The soundproof wall 1 of the present invention has excellent strength because the photocurable resin layer 3 contains the glass fiber 2. Examples of preferable strength of the soundproof wall 1 of the present invention include a tensile strength of 500 N / 25 mm or more, preferably 800 N / 25 mm or more, more preferably 1000 N / 25 mm or more. The tensile strength is a value measured according to JIS R3420: 2013 7.4 using Tensilon RTC-1310A manufactured by A & D Corporation as a test device. The upper limit is not particularly limited, but may be, for example, 3000 N / 25 mm or less, and may be 2000 N / 25 mm or less.

<Color difference ΔE * ab of smoke barrier before and after exposure test using sunshine weather meter>
In the soundproof wall 1 of the present invention, since the fluororesin layer 4 has a transmittance of 30% or less at a wavelength of 380 nm measured by a spectrophotometer, deterioration such as discoloration of the photocurable resin layer 3 due to ultraviolet rays does not easily occur. Therefore, it is possible to maintain high transparency even when used outdoors for a long time. As a preferred embodiment of the performance of maintaining transparency when the soundproof wall 1 of the present invention is used outdoors for a long period of time, for example, a color difference ΔE * ab measured by the following method is preferably 5 or less, more preferably 5 or less. Is 3 or less.
(Measuring method)
First, L * ₁ , a * _1, and b * ₁ of a sample in which the soundproof wall is cut into 7.5 cm × 15 cm are measured using a color difference meter “CR300” manufactured by Konica Minolta, Inc. Next, the sample was subjected to a 500-hour exposure test (black panel temperature: 63 ° C., humidity: 50%) using a sunshine weather meter (trade name: S80D, manufactured by Suga Test Instruments Co., Ltd.) as a device according to JIS K 7350-4. , Without water spray). Next, L * ₂ , a * ₂ , and b * ₂ of the exposed surface of the sample after the exposure test are measured using a color difference meter "CR300" manufactured by Konica Minolta, in the same manner as before the exposure test. Then, from the obtained L * ₁ , a * _1, and b * ₁ before the exposure test and L * ₂ , a * ₂ , b * ₂ after the exposure test, according to JIS Z 8730: 2009 7.1.1. ΔE * ab is calculated by the following equation.
ΔE * ab = [(L * ₁ -L * ₂ ) ² + (a * ₁ -a * ₂ ) ² + (b * ₁ -b * ₂ ) ² ] ^0.5

The mass sound barrier 1 of the present invention (g / ^{m 2),} is not particularly limited, for example, 150~1000g / ^{m 2} can be mentioned, 300 to 600 g / ^{m 2} may be preferably mentioned. The thickness (mm) of the soundproof wall 1 of the present invention is, for example, 100 to 800 mm, and preferably 250 to 500 mm.

[Use of soundproof wall 1]
The soundproof wall of the present invention can be used, for example, as a soundproof wall used outdoors, more specifically, as a soundproof wall on a highway, a railway, a construction site, or a construction site.

[Manufacturing method of soundproof wall 1]
The method for manufacturing the soundproof wall 1 of the present invention is not particularly limited. For example, the following manufacturing method can be mentioned. First, a glass fiber cloth composed of the glass fiber 2 and an uncured photocurable resin composition constituting the photocurable resin layer 3 are prepared. The photocurable resin composition is applied to a transparent PET film as a process film, and a glass fiber cloth as a glass fiber 2 is placed on the photocurable resin composition, and the photocurable resin composition is applied to the glass fiber 2. , And another transparent PET film to be a process film is placed on a glass fiber cloth, which is another glass fiber 2, and pressure is applied from the surface of each of the two process films to form a photocurable resin composition on the glass fiber 2. The photocurable resin composition is further impregnated and cured by heating or light irradiation. Thereafter, the two PET films used as the above process films are peeled off, and a fluororesin film as the fluororesin layer 4 is laminated on both surfaces of the photocurable resin layer 3 including the glass fibers 2, and heated with a heating press machine. The soundproof wall 1 of the present invention, which is a laminated structure of the fluororesin layer 4 / the photocurable resin layer 3 containing the glass fibers 2 / the fluororesin layer 4, can be obtained by bonding by pressing.

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

As the photocurable resin composition constituting the photocurable resin layer 3, an acrylic syrup (trade name “Acrysirap XD-8005” manufactured by Ryo Akira Co., Ltd. (refractive index 1. 550) and “Acrysirup XD-8006” (refractive index 1.570) mixed at a mass ratio of 1: 1) and a photopolymerization initiator (Omnirad 184 manufactured by IGM). Got ready. Examples of the fluororesin layer 4 include a sheet containing PVDF and an acrylic resin (sheet A, which is an alloy of PVDF and PMMA and has a PVDF content of 80% by mass and a PMMA content of 20% by mass); (“DENKA DX film DX-14S100”, manufactured by Denka Corporation, trade name “Denka DX Film DX-14S100”, thickness: 100 μm, mass: 136 g) containing 20 mass% of PMMA and 80 mass% of PMMA / M ² , transmittance at a wavelength of 380 nm 10%)).

(Example 1)
Unitica Glass Fiber Co., Ltd. product name “E225 1/01 1Z” (average filament diameter 7 μm, average number of filaments 200, number of twists 1Z) is used as the warp and weft, and the warp density is 60 threads. / 25 mm, and a plain weave glass fiber fabric having a weft density of 57 yarns / 25 mm was obtained. Next, the spinning sizing agent and the weaving sizing agent attached to the obtained glass fiber fabric were removed by heating at 400 ° C. for 30 hours. Thereafter, a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) Chisso Corporation) as a surface treatment agent was adjusted to a concentration of 15 g / L and squeezed with a padder roll. After that, drying and curing were performed at 120 ° C. for 1 minute. Then, the glass fiber fabric was subjected to a widening process by a water flow process at a pressure of 1.5 MPa while the tension of the glass fiber fabric was set to 100 N / m in the longitudinal direction, to obtain a glass fiber fabric as the glass fiber 2. The obtained glass fiber fabric had a warp density of 60 threads / 25 mm, a weft density of 57 threads / 25 mm, a thickness of 90 μm, a mass of 105 g / m ² , and a refractive index of 1.561. Two glass fiber fabrics were prepared.

The photocurable resin composition described in Table 1 as the photocurable resin layer 3 was applied on the PET film as the process film. Next, on the photocurable resin composition, two pieces of the glass fiber woven fabric composed of the obtained glass fibers 2 are placed, and left for 1 minute, and the above-described photocurable The resin composition was impregnated. Next, another PET film as a process film was placed on the photocurable resin composition, and pressure was applied by a roller so that the weight of the photocurable resin composition layer 3 became 250 g / m ² . Thereafter, light irradiation (light irradiation conditions) was performed using a black light fluorescent lamp (trade name: FL15BLB manufactured by Toshiba Corporation) on the photocurable resin composition to be formed into the photocurable resin layer 3 through a PET film as a process film. : Integrated light amount 200 mJ / cm ² ) to cure the photocurable resin composition, and peel off the two process films to form a photocurable resin composition layer 3 containing glass fibers 2. The space between the glass fibers of the glass fiber cloth is impregnated with the photocurable resin layer 3 (cured product of the resin composition), and the photocurable resin layers 3 are formed on both surfaces of the glass fiber cloth layer. It had been.

Next, the obtained photocurable resin composition layer 3 containing the glass fiber 2 was bonded to two sheets containing the above-mentioned PVDF and acrylic resin, and both of the sheets were bonded to the photocurable resin composition layer 3. The sheet is sandwiched such that the surface to be coated is on the sheet B side (that is, the acrylic resin-rich surface), and is pressed by a heating press at a temperature of 160 ° C. under a pressure of 10 kgf / cm ^{2 for} a time of 5 minutes. By bonding the curable resin composition layer 3 and a sheet containing PVDF and an acrylic resin, a laminate structure of a fluororesin layer 4 / a photocurable resin layer 3 containing glass fibers 2 / a fluororesin layer 4 is formed. A certain soundproof wall 1 of the present invention was obtained.

(Example 2)
Unitica Glass Fiber Co., Ltd. trade name “D450 1/01 1Z” (average filament diameter 5 μm, average number of filaments 200, number of twists 1Z) is used as the warp and weft, and weaving is performed with an air jet loom, and the warp density is 59. / 25 mm and a plain weave glass fiber woven fabric having a weft density of 47 yarns / 25 mm were obtained. Next, the spinning sizing agent and the weaving sizing agent attached to the obtained glass fiber fabric were removed by heating at 400 ° C. for 30 hours. Thereafter, a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) Chisso Corporation) as a surface treatment agent was adjusted to a concentration of 15 g / L and squeezed with a padder roll. After that, drying and curing were performed at 120 ° C. for 1 minute to obtain a glass fiber fabric as glass fiber 2. The obtained glass fiber fabric had a thickness of 60 μm, a mass of 50 g / m ² , and a refractive index of 1.561. Four glass fiber fabrics were prepared.

The photocurable resin composition described in Table 1 as the photocurable resin layer 3 was applied on the PET film as the process film. Next, on the photo-curable resin composition, four glass fiber fabrics composed of the glass fibers 2 obtained above are placed, and left for 1 minute to leave the photo-curable resin in the gaps between the glass fibers 2. The resin composition was impregnated. Next, another PET film as a process film was placed on the photocurable resin composition, and pressure was applied by a roller so that the weight of the photocurable resin composition layer 3 became 250 g / m ² . Thereafter, light irradiation (light irradiation conditions) was performed using a black light fluorescent lamp (trade name: FL15BLB manufactured by Toshiba Corporation) on the photocurable resin composition to be formed into the photocurable resin layer 3 through a PET film as a process film. : Integrated light amount 200 mJ / cm ² ) to cure the photocurable resin composition, and peel off the two process films to form a photocurable resin composition layer 3 containing glass fibers 2. The space between the glass fibers of the glass fiber cloth is impregnated with the photocurable resin layer 3 (cured product of the resin composition), and the photocurable resin layers 3 are formed on both surfaces of the glass fiber cloth layer. It had been.

Next, the obtained photocurable resin composition layer 3 containing the glass fiber 2 was bonded to two sheets containing the above-mentioned PVDF and acrylic resin, and both of the sheets were bonded to the photocurable resin composition layer 3. The sheet is sandwiched such that the surface to be coated is on the sheet B side (that is, the acrylic resin-rich surface), and is pressed by a heating press at a temperature of 160 ° C. under a pressure of 10 kgf / cm ^{2 for} a time of 5 minutes. By bonding the curable resin composition layer 3 and a sheet containing PVDF and an acrylic resin, a laminate structure of a fluororesin layer 4 / a photocurable resin layer 3 containing glass fibers 2 / a fluororesin layer 4 is formed. A certain soundproof wall 1 of the present invention was obtained.

(Comparative Example 1)
Unitica Glass Fiber Co., Ltd. product name “E225 1/01 1Z” (average filament diameter 7 μm, average number of filaments 200, number of twists 1Z) is used as the warp and weft, and the warp density is 60 threads. / 25 mm, and a plain weave glass fiber fabric having a weft density of 57 yarns / 25 mm was obtained. Next, the spinning sizing agent and the weaving sizing agent attached to the obtained glass fiber fabric were removed by heating at 400 ° C. for 30 hours. Thereafter, a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) Chisso Corporation) as a surface treatment agent was adjusted to a concentration of 15 g / L and squeezed with a padder roll. After that, drying and curing were performed at 120 ° C. for 1 minute. Then, the glass fiber fabric was subjected to a widening process by a water flow process at a pressure of 1.5 MPa while the tension of the glass fiber fabric was set to 100 N / m in the longitudinal direction, to obtain a glass fiber fabric as the glass fiber 2. The obtained glass fiber fabric had a warp density of 60 threads / 25 mm, a weft density of 57 threads / 25 mm, a thickness of 90 μm, a mass of 105 g / m ² , and a refractive index of 1.561. Two glass fiber fabrics were prepared.

The photocurable resin composition described in Table 1 as the photocurable resin layer 3 was applied on the PET film as the process film. Next, on the photocurable resin composition, two pieces of the glass fiber woven fabric composed of the obtained glass fibers 2 are placed, and left for 1 minute, and the above-described photocurable The resin composition was impregnated. Next, another PET film as a process film was placed on the photocurable resin composition, and pressure was applied by a roller so that the weight of the photocurable resin composition layer 3 became 250 g / m ² . Thereafter, light irradiation (light irradiation conditions) was performed using a black light fluorescent lamp (trade name: FL15BLB manufactured by Toshiba Corporation) on the photocurable resin composition to be formed into the photocurable resin layer 3 through a PET film as a process film. : Integrated light amount 200 mJ / cm ² ) to cure the photocurable resin composition, peel off two process films, and form a photocurable resin composition layer 3 containing glass fibers 2, Comparative Example 1 Soundproof wall. The space between the glass fibers of the glass fiber cloth is impregnated with the photocurable resin layer 3 (cured product of the resin composition), and the photocurable resin layers 3 are formed on both surfaces of the glass fiber cloth layer. It had been.

  In Examples 1 and 2, and Comparative Example 1, the weaving density of the glass fiber fabric was measured and calculated according to JIS R 3420 2013 7.9. The thickness of the glass fiber fabric was measured and calculated according to JIS R 3420 2013 7.10.1A method. The mass of the glass fiber fabric was measured and calculated according to JIS R 3420 2013 7.2. The aperture ratio of the glass fiber fabric was measured and calculated by the method described above. The refractive indices of the photocurable resin layer 3 and the glass fiber 2 were measured and calculated by the method described above. The transmittance at a wavelength of 380 nm of the fluororesin layer 4 was measured by the method described above. The following evaluation was performed after the soundproof wall 1 was manufactured and left indoors for one week.

(Total light transmittance and haze)
It was measured by the method described above.

<Color difference ΔE * ab of smoke barrier before and after exposure test using sunshine weather meter>
The color difference ΔE * ab of the smoke barrier before and after the exposure test using the sunshine weather meter was measured and evaluated by the method described above. ΔE * ab was 5 or less.

  The strength was measured by the method described above. 500N / 25mm or more was regarded as a pass.

  Table 1 shows the evaluation results.

  As shown in Table 1, the soundproof walls of Examples 1 and 2 each include a photocurable resin layer containing glass fibers and a fluororesin layer laminated on at least one surface of the photocurable resin layer. Wherein the fluororesin layer has a transmittance at a wavelength of 380 nm measured by a spectrophotometer of 30% or less, a total light transmittance of the sound insulation wall of 75% or more, and a haze of 20%. From the following, it was excellent in strength, and it was possible to maintain high transparency when used outdoors for a long time.

  On the other hand, Comparative Example 1 did not include a fluororesin layer having a transmittance of 30% or less at a wavelength of 380 nm measured by a spectrophotometer on at least one side of the photocurable resin layer. However, it has been difficult to maintain high transparency when used outdoors for a long period of time.

DESCRIPTION OF SYMBOLS 1 ... Soundproof wall 2 ... Glass fiber 3 ... Photocurable resin layers 31, 32 ... Surface part of photocurable resin layer 4 ... Fluororesin layer

Claims (8)

A photo-curable resin layer containing glass fibers, and a fluorine-containing resin layer laminated on at least one surface side of the photo-curable resin layer, a soundproof wall,
The fluororesin layer has a transmittance at a wavelength of 380 nm measured by a spectrophotometer of 30% or less,
The soundproof wall, wherein the total light transmittance of the soundproof wall is 75% or more and the haze is 20% or less.   The soundproof wall according to claim 1, wherein the glass fiber is included as a glass fiber fabric, and 2 to 10 glass fiber fabrics are included in the photocurable resin layer.   The soundproof wall according to claim 2, wherein the aperture ratio of the glass fiber fabric is 15% or more and 30% or less.   The fluororesin layer includes a PVDF-rich surface and an acrylic resin-rich surface, and a surface to be bonded to the photocurable resin layer is the acrylic resin-rich surface. The soundproof wall described in.   The soundproof wall according to any one of claims 1 to 4, wherein the tensile strength is 500 N / 25 mm or more. The soundproof wall according to any one of claims 1 to 5, wherein a color difference ΔE * ab measured by the following method is 5 or less.
(Measuring method)
First, L * ₁ , a * _1, and b * ₁ of a sample in which the soundproof wall is cut into 7.5 cm × 15 cm are measured using a color difference meter “CR300” manufactured by Konica Minolta, Inc. Next, the sample was subjected to a 500-hour exposure test (black panel temperature: 63 ° C., humidity: 50%) using a sunshine weather meter (trade name: S80D, manufactured by Suga Test Instruments Co., Ltd.) as a device according to JIS K 7350-4. , Without water spray). Next, L * ₂ , a * ₂ , and b * ₂ of the exposed surface of the sample after the exposure test are measured using a color difference meter "CR300" manufactured by Konica Minolta, in the same manner as before the exposure test. Then, from the obtained L * ₁ , a * _1, and b * ₁ before the exposure test and L * ₂ , a * ₂ , b * ₂ after the exposure test, according to JIS Z 8730: 2009 7.1.1. ΔE * ab is calculated by the following equation.
ΔE * ab = [(L * ₁ -L * ₂ ) ² + (a * ₁ -a * ₂ ) ² + (b * ₁ -b * ₂ ) ² ] ^0.5 Mass is 150~1000g / ^{m 2,} a thickness of 100～800Mm, soundproof walls according to any one of claims 1-6. The soundproof wall according to any one of claims 1 to 7, which is installed outdoors.