JP6275982B2 - Soundproof material, soundproof structure and construction method thereof - Google Patents

Description

  The present invention relates to a soundproofing material (or soundproofing material) for insulating air-borne sound, in particular, a soundproofing material for a hollow double wall structure and a soundproofing structure (or soundproofing structure) that can effectively prevent resonance transmission, and a construction method thereof.

  There are various noise factors in buildings and buildings such as houses. For example, floor walking sounds, floor falling sounds, impact sounds, etc. are propagated downstairs to cause noise. These noises are mainly due to solid-borne sound. On the other hand, noise includes noise caused by air-propagating sound in which sound propagates through the air, and speech, TV, music, etc. tend to be a problem because noise propagates between adjacent rooms and between upper and lower floors.

  Conventionally, for the purpose of sound insulation, sound insulation materials used for structural members such as doors of buildings, walls, partitions, etc. have achieved a sound insulation effect by increasing their sound transmission loss. And it is widely known that the sound transmission loss follows the mass law. However, in a soundproofing material used for a wall, door, ceiling, etc. of a building having a light weight structure such as a wooden structure or a steel frame structure, there is a limit to increase the mass due to structural restrictions and economic restrictions.

As a lightweight wall structure with large sound transmission loss, it is difficult to improve the sound insulation effect with a single wall (single plate) structure, so a hollow double wall structure with surface materials located on both sides of the column is often used. Are known. However, even with a hollow double-wall structure, the coincidence effect due to forced bending vibration caused by the strength of sound waves incident in an oblique direction, or the air in the hollow layer acts as a spring, Transmission loss is reduced due to resonance transmission or the like in which vibration propagates to the other surface material on the transmission side and resonates. In particular, in a lightweight wall structure or door, the resonance transmission frequency (f _r ) of resonance transmission is low, and the transmission loss is significantly reduced in the low frequency range.

  In order to reduce such resonance transmission, for example, in the case of a wall, a method is known in which a sound insulating material is interposed between a column (or a column) and a surface material. However, in this method, since the thickness of the sound insulating material is reflected in the wall thickness, the total wall thickness is increased. Further, even when sound insulation is partially performed on one wall, a level difference is generated on the wall, so that a sound insulation material is required on the wall. Moreover, although the method of arrange | positioning pillars in a zigzag form and becoming independent is also known, the number of pillars will be nearly twice as much as a normal pillar, and construction will also become complicated.

  Japanese Patent Laid-Open No. 2001-3482 (Patent Document 1) discloses a required number of hollow sound-absorbing materials (open elongated tubes, etc.) having a specific resonance frequency in a hollow portion between a pair of wall surface elements in a double wall. ) And, if necessary, a porous sound absorbing material (glass wool, rock wool, etc.) to effectively absorb and block sound propagation and reduce resonance transmission in the low frequency range.

  However, since this sound insulating wall has a structure in which a large number of hollow sound absorbing materials are arranged, the structure of the sound insulating wall is complicated and the workability of the sound insulating wall is lowered.

JP 2010-229809 (Patent Document 2) includes wet heat adhesive fibers as a sound insulation panel suitable for a house wall or a partition panel, and the fibers are fixed by fusion of the wet heat adhesive fibers. A soundproof panel composed of a non-woven fiber structure and a face material, wherein the non-woven fiber structure has a fiber adhesion rate of 3 to 85% and an apparent density of 0.03 to 0.7 g / cm. ³ is disclosed. This document also discloses a sound insulation panel having a hollow double wall structure in which a crosspiece corresponding to a stud is formed of the nonwoven fiber structure.

  However, even with this panel, the sound insulation against air-borne sound is low, and resonance transmission cannot be reduced.

  Furthermore, as a floor structure, Japanese Patent Application Laid-Open No. 2012-77600 (Patent Document 3) includes a wet-heat-adhesive fiber, and is formed of a nonwoven fiber structure in which fibers are fixed by fusion of the wet-heat-adhesive fiber. In addition, a sound insulation floor structure including a laminated structure of a layer to be compressed and a floor sound insulation structure having a space and a vibration damping layer formed of a vibration damping material such as asphalt is disclosed. In this sound insulating floor structure, the laminated structure is disposed between the floor base material and the floor finish material.

  However, in the sound insulation floor structure, the purpose is to suppress the sound insulation against the floor impact sound centered on the solid propagation sound, and the space portion is also formed, but the ratio is small and resonance transmission does not occur in the audible range. . That is, in the sound insulation floor structure, it is not assumed that the air propagation sound is insulated. Further, in the sound insulation floor structure, in addition to the compressed layer and the vibration damping layer, a plurality of other layers such as a floor base material and a floor finishing material are laminated, and the structure is complicated. In the sound insulation floor structure, the laminated structure of the layer to be compressed and the damping layer is disposed on the floor base material, and the lower structure of the floor base material is not described, but depending on the floor structure, There is also a structure in which a floor base material and a ceiling material form a double wall structure. However, in the case of the floor structure, similarly to the wall, transmission loss is reduced by the coincidence effect and resonance transmission.

JP 2001-3482 A (claim, paragraph [0015], FIG. 1) JP 2010-229809 (Claim 1, paragraphs [0084] [0086] [0169], FIG. 2) JP 2012-77600 A (Claims, paragraphs [0085] to [0089], FIG. 3)

  Accordingly, an object of the present invention is to provide a soundproofing material capable of effectively absorbing or insulating air-propagating sound in spite of its light weight and simple structure, a soundproofing structure using this soundproofing material, and a construction method thereof. It is in.

  Another object of the present invention is to provide a soundproofing material capable of reducing resonance transmission without increasing the total thickness of a hollow double wall structure such as a wall or a floor, a soundproofing structure using this soundproofing material, and a method for constructing the same. There is.

  Still another object of the present invention is to provide a soundproofing material having high workability and capable of maintaining sound insulation even after long-term use, a soundproofing structure using this soundproofing material, and a method for its construction.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors set the density of the buffer layer formed of the buffer material within a specific range, and are two types having a density that is larger than the buffer layer and different in density. The present inventors have found that a soundproofing material capable of effectively absorbing or insulating air-propagating sound can be obtained in spite of the light weight and simple structure by including the mass layer.

That is, the soundproofing material of the present invention is a soundproofing material that can contact the inner wall of a hollow double-walled structure having an air layer inside and that blocks airborne sound, and is formed of a cushioning material. A buffer layer having a density of 0.03 to 0.7 g / cm ³ and a mass layer having a density higher than that of the buffer layer, and the mass layer is more than the first mass layer and the first mass layer; And a second mass layer having a small density. The density of the first mass layer may be 1 g / cm ³ or more, and the thickness ratio between the first mass layer and the second mass layer may be the former: the latter = 1: 1 to 1:10. Good. The soundproofing material of the present invention is a non-woven fiber structure in which the buffer material forming the buffer layer includes wet heat adhesive fibers, and the fibers are fixed by fusion of the wet heat adhesive fibers. The fiber structure may have a fiber adhesion rate of 3 to 85% and an apparent density of 0.05 to 0.2 g / cm ³ . The first mass layer may be formed of a vibration damping material including asphalt, and the second mass layer may be formed of a wood material.

  In the present invention, a plurality of horizontal members are interposed in parallel with a space between the first surface material and the second surface material, and an air layer is formed between the first surface material and the second surface material. A soundproof structure having a hollow double-walled structure, wherein the soundproof material is disposed on the inner wall of the first or second surface material in the air layer. The thickness ratio between the buffer layer and the air layer may be the former: the latter = 1: 500 to 1: 2. The buffer layer may be laminated on the inner wall of the first or second surface material. The soundproof structure of the present invention may be a floor structure in which the first or second surface material is a ceiling material and the soundproof material is laminated on the upper side of the ceiling material.

  Further, in the present invention, the soundproofing material is disposed on the inner wall of the first surface material, and the first surface material is fixed to one side of a plurality of horizontal members disposed in parallel at intervals. The construction method of the soundproof structure including the 1st surface material fixing process to perform and the 2nd surface material fixing process of fixing the 2nd surface material to the other side part side of an adjacent horizontal member is also included.

  In this specification, the hollow double wall structure means a hollow structure in which a horizontal member is interposed between two surface materials, and is a building wall or door (a partition plate or a field wall in the direction of gravity). ) And a floor (horizontal partition plate or boundary floor) structure, a partition structure installed in an oblique direction, and the like are also included.

  Further, the horizontal member is a frame of a hollow double wall structure, and is formed between the surface members in order to form an air layer (a space portion or a void portion) between the first surface material and the second surface material. This is a supporting material that is handed over, meaning a rod-shaped, block-shaped or plate-shaped supporting material. In a hollow double wall structure of a wall or door, a pillar (intermediate column) or a crosspiece corresponds to a horizontal member, and a hollow double floor In the wall structure, beams, joists, small beams, hanging trees, field ledges, field edges, etc. correspond to horizontal members.

In the present invention, the soundproofing material that can contact the inner wall of the hollow double-walled structure having an air layer therein and that blocks the air-borne sound has an apparent density of 0.03 to 0 formed of the cushioning material. .7 g / cm ³ buffer layer and two types of mass layers that are larger than the buffer layer and have different densities, so that air-borne sound is effective despite its light weight and simple structure. In particular, it is possible to absorb or block sound, and in particular, resonance transmission can be reduced without increasing the total thickness of a hollow double wall structure such as a wall or floor.

FIG. 1 is a partially cutaway schematic perspective view showing an example of a soundproof structure of the present invention. FIG. 2 is a schematic perspective view showing another example of the soundproof structure of the present invention.

[Soundproof material]
The soundproofing material of the present invention is a soundproofing material that can contact the inner wall of a hollow double wall structure having an air layer inside, and has an apparent density of 0.03 to 0.7 g / cm ³ formed of a cushioning material. The mass layer includes a buffer layer and a mass layer larger than the density of the buffer layer, and the mass layer includes a first mass layer and a second mass layer having a density smaller than the first mass layer.

(Buffer layer)
In the soundproofing material of the present invention, the buffer layer is configured to be combined with two kinds of mass layers having a density higher than that of the buffer layer and having different densities, so that the air propagation sound can be effectively absorbed or sound-insulated. .

It is important that the apparent density of the buffer layer in the present invention is 0.03 to 0.7 g / cm ³ . By adjusting the apparent density within this range, it is possible to express excellent sound absorption while being lightweight, and also maintain moldability and workability. The apparent density of the buffer layer is more preferably 0.04 to 0.5 g / cm ³ , still more preferably 0.05 to 0.2 g / cm ³ , but is appropriately selected according to the target frequency range It is also possible to do. If you want to improve the sound insulation of the low frequency range, the apparent density, for example, is preferably 0.03~0.1g / cm ^3, more preferably 0.04~0.09g / cm ³ More preferably, it is about 0.05 to 0.08 g / cm ³ . On the other hand, in order to improve the sound insulation of the high-frequency range, for example, it is preferably 0.1~0.7g / cm ^3, more preferably 0.12~0.3g / cm ^3, More preferably, it is about 0.15 to 0.2 g / cm ³ .

Examples of the buffer material having an apparent density of 0.03 to 0.7 g / cm ³ include, for example, plastic foam (for example, foamed styrene, foamed urethane, foamed polyolefin, etc.), rubber or elastomer, and fiber structure (woven / knitted fabric, non-woven fabric) Etc.) can be used. Of these, a fiber structure is preferable from the viewpoint of excellent sound insulation, including wet heat adhesive fibers from the viewpoint of excellent shape stability and workability, and high sound insulation, and by fusion of the wet heat adhesive fibers. Nonwoven fiber structures with fixed fibers are particularly preferred.

  The non-woven fiber structure to which the fibers are fixed by fusion of wet heat adhesive fibers is bonded evenly in the thickness direction in order to bond using high-temperature (superheated or heated) water vapor, and the fiber structure is maintained. However, it is also excellent in moldability and workability. Furthermore, this non-woven fiber structure can also control the frequency range of the air-propagating sound to be sound-insulated by adjusting the density (in some cases, the fiber structure may be referred to as apparent density), the fiber adhesion rate, and the like.

In this nonwoven fiber structure, the wet heat adhesive fiber is composed of at least a wet heat adhesive resin. The wet heat adhesive resin only needs to be able to flow or easily deform at a temperature that can be easily realized by high-temperature steam and to exhibit an adhesive function. Specifically, a thermoplastic resin that is softened with hot water (for example, about 80 to 120 ° C., particularly about 95 to 100 ° C.) and can be self-adhered or bonded to other fibers is used, such as ethylene and propylene. A vinyl alcohol polymer containing an α-C _2-10 olefin unit, particularly an ethylene-vinyl alcohol copolymer is preferably used.

  In the ethylene-vinyl alcohol copolymer, the ethylene unit content (copolymerization ratio) is, for example, preferably 5 to 65 mol%, more preferably 10 to 65 mol%, and more preferably 20 to 55 mol%. It is more preferable that it is mol%, and it is especially preferable that it is about 30-50 mol%. The saponification degree of the vinyl alcohol unit in the ethylene-vinyl alcohol copolymer is preferably, for example, about 90 to 99.99 mol%, more preferably 95 to 99.98 mol%, and 96 to More preferably, it is about 99.97 mol%. The viscosity average degree of polymerization of the ethylene-vinyl alcohol copolymer can be selected as necessary. For example, it is preferably 200 to 2500, more preferably 300 to 2000, and about 400 to 1500. More preferably.

  The cross-sectional shape (cross-sectional shape perpendicular to the longitudinal direction of the fiber) of wet heat adhesive fibers is limited to general solid cross-sectional shapes such as round cross-sections and irregular cross-sections (flat, elliptical, polygonal, etc.) It may not be a hollow cross section. The wet heat adhesive fiber may be a composite fiber composed of a plurality of resins including at least a wet heat adhesive resin. The composite fiber only needs to have a wet heat adhesive resin on at least a part of the fiber surface, but it is preferable to have a wet heat adhesive resin continuous in the length direction on the fiber surface from the viewpoint of adhesiveness. The coverage of the wet heat adhesive resin is, for example, preferably 50% or more, more preferably 80% or more, and still more preferably 90% or more.

  Examples of the cross-sectional structure of the composite fiber in which the wet heat adhesive resin occupies the surface include a core-sheath type, a sea-island type, a side-by-side type, a multi-layer bonding type, a radial bonding type, and a random composite type. Among these cross-sectional structures, a core-sheath structure in which the wet heat adhesive resin covers the entire surface of the fiber (that is, the sheath portion is made of the wet heat adhesive resin because it is a structure with high adhesiveness. A core-sheath structure) is preferred. The core-sheath structure may be a fiber in which a wet heat adhesive resin is coated on the surface of a fiber composed of another fiber-forming polymer.

  In the case of a composite fiber, wet heat adhesive resins may be combined with each other, but may be combined with non-wet heat adhesive resins. Non-wet heat adhesive resins include water-insoluble or hydrophobic resins such as polyolefin resins, (meth) acrylic resins, vinyl chloride resins, styrene resins, polyester resins, polyamide resins, polycarbonate resins, Examples include polyurethane resins and thermoplastic elastomers. These non-wet heat adhesive resins can be used alone or in combination of two or more.

  Among these non-wet heat adhesive resins, from the viewpoint of heat resistance and dimensional stability, resins having a melting point higher than that of wet heat adhesive resins (particularly ethylene-vinyl alcohol copolymers), such as polypropylene resins and polyester resins. Resins and polyamide resins, particularly polyester resins and polyamide resins are preferred from the standpoint of excellent balance between heat resistance and fiber-forming properties.

  In the case of a composite fiber composed of a wet heat adhesive resin and a non-wet heat adhesive resin (fiber-forming polymer), the ratio (mass ratio) of both can be selected according to the structure (for example, core-sheath structure). The wet heat adhesive resin is not particularly limited as long as it exists on the surface. For example, wet heat adhesive resin: non-humid heat adhesive resin = 90: 10 to 10:90, preferably 80:20 to 15:85, more preferably It is about 60:40 to 20:80.

  The average fiber length of the wet heat adhesive fibers can be selected from a range of, for example, about 10 to 100 mm, preferably 20 to 80 mm, and more preferably about 25 to 75 mm.

  For example, the crimp rate of the wet heat adhesive fiber is preferably 1 to 50%, more preferably 3 to 40%, and still more preferably about 5 to 30%. The number of crimps is, for example, preferably 1 to 100 pieces / 25 mm, more preferably 5 to 50 pieces / 25 mm, and still more preferably about 10 to 30 pieces / 25 mm.

  The nonwoven fiber structure may further contain non-wet heat adhesive fibers in addition to the wet heat adhesive fibers. Examples of non-wet heat adhesive fibers include cellulosic fibers (for example, rayon fiber, acetate fiber, etc.) in addition to fibers made of the non-wet heat adhesive resin constituting the composite fiber. These non-wet heat adhesive fibers can be used alone or in combination of two or more. These non-wet heat adhesive fibers can be selected according to the target properties, and when combined with semi-synthetic fibers such as rayon, a fiber structure having relatively high density and high mechanical properties can be obtained.

  Although the ratio (mass ratio) of the wet heat adhesive fiber and the non-wet heat adhesive fiber can be selected according to the type and use of the panel, the former: the latter = 100: 0-20: 80 may be used, and 99: 1 to 20:80 is preferable, 100: 0 to 50:50 is more preferable, 95: 5 to 50:50 is further preferable, and about 100: 0 to 70:30 is preferable. Is particularly preferred.

  The fiber adhesion rate of the non-woven fiber structure containing wet heat adhesive fibers ranges from about 3 to 85% (for example, 5 to 60%) depending on the target frequency range (frequency range of air-borne sound to be sound-insulated). You can choose from. When improving the sound insulation in the low frequency range, the fiber adhesion rate is preferably 5 to 50%, more preferably 7 to 30%, and further preferably about 10 to 20%, for example. preferable. On the other hand, when improving the sound insulation in the high frequency range, the fiber adhesion rate is, for example, preferably 20 to 85%, more preferably 30 to 80%, and about 50 to 75%. Is more preferable. In this invention, since the fiber is adhere | attached in such a range, the freedom degree of each fiber is high and can express high sound insulation. The fiber adhesion rate can be measured by the method described in Examples described later, and indicates the ratio of the number of cross-sections of two or more fibers bonded to the number of cross-sections of all fibers in the non-woven fiber cross-section.

  The fibers constituting the non-woven fiber structure are bonded at the contact points of the respective fibers, and this adhesion point extends from the fiber structure surface to the inside (center) and the back surface along the thickness direction. A uniform distribution is preferred. That is, in the cross section in the thickness direction of the fiber structure, it is preferable that the fiber adhesion rate in each region divided into three equal parts in the thickness direction is in the above range. Furthermore, the ratio of the minimum value to the maximum value of the fiber adhesion rate in each region (minimum value / maximum value) (ratio of the minimum region to the region with the maximum fiber adhesion rate) may be, for example, 50% or more. 50 to 100%, preferably 55 to 99%, more preferably 60 to 98%, and particularly preferably about 70 to 97%.

  The average fineness of the fibers constituting the nonwoven fiber structure can be selected, for example, from the range of about 0.01 to 100 dtex, preferably 0.1 to 50 dtex, more preferably 0.5 to 30 dtex ( In particular, it is about 1 to 10 dtex).

Basis weight of the nonwoven fibrous structure, for example, be selected from 50~10000g / ^{m 2} in the range of about, is preferably 100~5000g / ^{m 2,} more preferably from 200~3000g / ^{m 2,} 300 More preferably, it is about ˜2000 g / m ² .

  Nonwoven fiber structures (or fibers) can be further added with conventional additives such as stabilizers (heat stabilizers such as copper compounds, UV absorbers, light stabilizers, antioxidants, etc.), dispersants, thickeners. Agents, fine particles, colorants, antistatic agents, flame retardants, plasticizers, lubricants, crystallization rate retarders, lubricants, antibacterial agents, insect and acaricides, fungicides, matting agents, heat storage agents, perfumes, fluorescent It may contain a brightening agent, a wetting agent, and the like.

  The non-woven fiber structure containing wet heat adhesive fibers is about 70 to 150 ° C. (especially 80 to 120 ° C.) with respect to a web (for example, semi-random web, parallel web, etc.) obtained using staple fibers. Is obtained by a method of injecting the high-temperature water vapor at a pressure of about 0.1 to 2 MPa (particularly preferably 0.2 to 1.5 MPa). The detailed production method is described in International Publication WO2007 / 116676. Manufacturing methods are available.

  The thickness of the buffer layer is, for example, preferably in the range of about 1 to 20 mm, more preferably 2 to 10 mm, and still more preferably about 2 to 8 mm.

(Mass layer)
The soundproof material of the present invention includes a mass layer having a density higher than that of the buffer layer, and the mass layer includes a first mass layer and a second mass layer having a density lower than that of the first mass layer. This is very important. By combining these two types of mass layers with the buffer layer, it is possible to obtain a vibration damping effect that exceeds the mass rule, and to improve the soundproofing performance as a soundproofing material.

Although the density of a 1st mass layer should just be larger than the density of a 2nd mass layer, it is preferable that it is 1 g / cm < ³ > or more, and it is 1-4 g / cm < ³ > in terms of lightweight property and workability. Is more preferably 2 to 3.5 g / cm ³ , and particularly preferably 2.5 to ³ g / cm ³ . If the density is less than 1 g / cm ³ , sufficient vibration damping effect may not be obtained.

The density of the second mass layer may be larger than the density of the buffer layer and smaller than the density of the first mass layer, but is preferably 2 g / cm ³ or less, preferably 0.4 to 1.9 g / cm. ³ is more preferable, and 0.5 to 1.8 g / cm ³ is still more preferable.

  The density ratio of the first mass layer to the second mass layer is preferably the former: the latter = 10: 9 to 10: 1, more preferably 2: 1 to 9: 1, and 4: 1. More preferably, it is ˜8: 1.

  The material of the mass layer is not particularly limited as long as both the first mass layer and the second mass layer have a density higher than that of the buffer layer. For example, organic materials (synthetic resins such as thermoplastic resins and thermosetting resins, natural or Synthetic rubber, elastomers, bituminous materials, wood materials, etc.) and inorganic materials (aluminum, steel, steel, metal materials such as stainless steel, gypsum, glass, ceramics, etc.) may be used. The first mass layer may be formed of a conventional vibration damping material containing an organic material such as asphalt or olefin resin, although it may be a layer formed of a mixture of an organic material and an inorganic material. It is particularly preferable that the workability is high, the weight is large, and the effect of reducing the resonance transmission is large, so that it is particularly preferable that the second mass layer is a workability point. It is more preferably formed by Luo wood material.

  In the damping material including asphalt, the asphalt is not particularly limited, and general asphalt, for example, petroleum asphalt such as natural asphalt, straight asphalt, blown asphalt, and the like can be used. These asphalts can be used alone or in combination of two or more.

  The vibration damping material may further contain a soft resin or an elastomer component. Examples of the soft resin or elastomer component include polyolefin, vinyl polymer (polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate). Copolymer, ethylene-ethyl acrylate copolymer, etc.), polyamide, polyester, synthetic rubber (polybutadiene, polyisoprene, styrene-butadiene copolymer, etc.), natural rubber, rosin resin (natural rosin, modified rosin, etc.) Etc. These soft resins or elastomer components can be used alone or in combination of two or more. Of these soft resins or elastomer components, styrene-diene copolymers such as styrene-butadiene block copolymers are preferred.

  In the vibration damping material, the ratio of the soft resin or the elastomer component is preferably 0 to 100 parts by mass, more preferably 1 to 80 parts by mass with respect to 100 parts by mass of asphalt, More preferably, it is about 50 parts by mass.

  The vibration damping material may further contain a filler. The filler may be an organic filler, but is preferably an inorganic filler from the viewpoint of high specific gravity.

  Examples of the shape of the inorganic filler include a particle shape or a powder shape, an indefinite shape, and a fiber shape, but a particle shape or a powder shape is preferable. The average particle size of the inorganic filler is, for example, preferably 0.5 mm or less (for example, 0.01 to 0.5 mm), and about 0.2 mm or less (for example, 0.05 to 0.2 mm). Is more preferable. Use of such a finely divided inorganic filler improves molding processability when producing a vibration damping material and allows a large amount of inorganic filler to be uniformly dispersed and blended in the asphalt base material. The surface density and thermal stability of the vibration material can be improved.

  Examples of the inorganic filler include metal particles (powder) such as iron, copper, tin, zinc, nickel, and stainless steel, iron oxide, iron sesquioxide, iron tetroxide, ferrite, tin oxide, zinc oxide, zinc white, Metal oxide particles such as copper oxide, aluminum oxide, metal salt particles such as barium sulfate, calcium sulfate, aluminum sulfate, calcium sulfite, calcium carbonate, calcium bicarbonate, barium carbonate, magnesium hydroxide, steelmaking slag, mica, clay, Examples include mineral particles such as talc, wollastonite, diatomaceous earth, silica sand, and pumice powder.

  These inorganic fillers can be used alone or in combination of two or more. Among these inorganic fillers, iron particles, various iron oxide particles, steelmaking slag particles, (heavy) calcium carbonate particles and the like are preferable.

  Examples of the wood material include solid wood, plywood (laminated wood board), laminated wood, wood fiber board (medium density fiber board MDF, particle board, oriented strand board, insulation board, etc.). These are excellent in holding power of nails.

  The thickness of the first mass layer in the present invention is, for example, preferably 1 to 20 mm, more preferably 2 to 10 mm, further preferably 2.5 to 7 mm, and 3.5 to 6 mm. It is particularly preferred. The thickness of the second mass layer may be 1 to 30 mm, preferably 5 to 25 mm, more preferably 7 to 20 mm, and particularly preferably 10 to 15 mm.

  The total thickness of the first mass layer and the second mass layer may be, for example, 2 to 50 mm, preferably 5 to 40 mm, more preferably 7 to 30 mm, and 10 to 25. Is more preferable, and it is especially preferable that it is 12-20 mm. If the total thickness is within this range, an excellent vibration damping effect can be exhibited, and if it is too thick, the lightness as a soundproofing material decreases.

  As the soundproofing material, the vibration damping effect improves as the thickness of the first mass layer having a higher density increases. However, in the present invention, the density is increased by combining the buffer layer and at least two different mass layers. It is possible to reduce the thickness of the first mass layer.

  The ratio of the thickness of the first mass layer to the second mass layer may be, for example, the former: the latter = 1: 1 to 1:10, and is preferably 1: 2 to 1: 5. More preferably, it is 2.5 to 1: 3.5. When the ratio of the thicknesses of the two layers is within this range, it is possible to exhibit more excellent sound absorption as a soundproofing material while maintaining light weight.

  The soundproofing material of the present invention can contain other mass layers as long as the effects of the present invention are not impaired. The material of the other mass layers can be selected from the same materials as the above two types of mass layers.

(Relationship between buffer layer and mass layer)
The ratio between the thickness of the buffer layer and the total thickness of the first mass layer and the second mass layer can be selected from the range of the former: the latter = 1: 10 to 1: 1, for example, 1: 8 to 1: 2 is more preferable. If the thickness ratio of the mass layer is too large, the lightness as the soundproofing material is lowered, and if it is too small, the soundproofing effect may not be sufficiently exhibited.

  In the soundproofing material of the present invention, the buffer layer and the two kinds of mass layers may be laminated in direct contact with each other or may be laminated through other layers. The order of lamination of the layers is not particularly limited, and other layers may be interposed between the layers. However, the buffer layer and the first mass may be disposed on the inner walls of the first and second surface agents. The layers are preferably laminated so as to be in direct contact in the order of the layer and the second mass layer. Further, these layers may be bonded with nails or the like, or fixed and disposed on other fixed objects.

[Soundproof structure]
In the soundproof structure of the present invention, a plurality of horizontal members are interposed in parallel between the first surface material and the second surface material, and an air layer is interposed between the first surface material and the second surface material. A soundproof structure having a hollow double wall structure in which the soundproof material is laminated on the inner wall of the first or second surface material in the air layer. In the present invention, since the soundproof structure has an air layer inside, it is excellent in sound insulation, and since the soundproofing material includes a buffer layer and a mass layer, resonance transmission in the air-borne sound can be reduced, so in a wide frequency range. Sound insulation can be improved.

  FIG. 1 is a schematic perspective view showing an example of a soundproof structure of the present invention. This soundproof structure is a hollow double wall structure mainly in a wall or a door. In this example, the soundproof structure 1 having a hollow double wall structure includes a plurality of horizontal members 4 (columns or studs) in parallel with a space between the first surface material 2 and the second surface material 3. The air layer 5 is formed between the adjacent horizontal members. In the air layer 5 of the soundproof structure 1, a part of the inner wall of the first surface material 2 has a buffer layer 6a and a mass layer 6b having a density larger than that of the buffer layer 6a (the first mass layer 6b1 and the first mass layer 6b). The soundproofing material 6 formed by 2) includes a 2 mass layer 6b2. As shown in this example, in the present invention, a soundproof material in which a buffer layer and a mass layer are combined is disposed inside a hollow double wall structure. In particular, since the soundproofing material is disposed as a part of the inner wall of the surface material without being disposed as a surface material, the soundproofing performance can be improved without increasing the total thickness of the soundproofing structure. it can.

  FIG. 2 is a schematic perspective view showing another example of the soundproof structure of the present invention. This soundproof structure is a floor structure useful for reducing air-borne sound between upper and lower floors in a multi-storey building (multi-storey building). In this example, the soundproof structure 11 having a hollow double-wall structure includes a plurality of horizontal members 14 combined between a first surface material 12 and a second surface material 13, and the first surface material An air layer 15 surrounded by the wall 17 is formed between the first surface material and the second surface material.

  The first surface material is a laminate of a floor finishing material 12a formed of flooring and a floor base material 12b formed of plywood board. The horizontal member 14 is formed by combining a beam 14a, a small beam 14b, a suspended tree 14c, a field edge receiver 14d, and a field edge 14e, each of which is a rod-shaped member (elongate member) having a rectangular cross section (rectangular shape). ing. In particular, the beam has a larger cross-sectional size as the main horizontal member than other horizontal members, and the height of the beam (long side of the cross-sectional shape) occupies most of the thickness direction of the air layer. The second surface material 13 is a ceiling material formed of gypsum board, and in this floor structure, in order to firmly fix the ceiling material to the beam, a small beam and a suspended tree are provided between the beam and the ceiling material. A combination of a field ledge and a field rim is interposed.

  Also in this example, the soundproof material 16 is formed in a band shape (rectangular shape) extending in the length direction of the field edge on the second surface material 13 (substantially the central part between the adjacent field edges 14e). The soundproof material 16 has the same laminated structure as the soundproof material 6 of the soundproof structure 1 shown in FIG. 1, for example, a hollow double wall structure formed between a floor base material and a ceiling material. A soundproofing material in which the buffer layer and the mass layer are combined is disposed inside (air layer). Even in this floor structure (soundproof structure), the soundproofing material is disposed on a part of the air layer under the flooring material without being laminated on the flooring material, so that the total thickness of the floor structure is reduced. The soundproof performance can be improved without increasing the size.

In soundproof structure according to the present invention, soundproof material, have been provided on the entire inner wall surface of the hollow double-walled structure formed by the first or second surface material (one of the inner wall surface acoustic insulation is laminated) However, it may be arranged (stacked) in part. The area ratio occupied by the soundproofing material with respect to the entire inner wall surface may be, for example, 10 to 90%, preferably 20 to 80% from the viewpoint of balance with lightness, and 30 to 70. % Is more preferable, and 40 to 60% is particularly preferable. If the area ratio occupied by the soundproofing material is too small, the sound insulation may be lowered.

  The shape of the soundproofing material is not limited to the band shape (rectangular shape) as long as it is arranged in such an area ratio, and may be other shapes such as a square shape. Further, a plurality of soundproofing materials may be formed on the inner wall. For example, a plurality of band-shaped soundproofing materials may be arranged at intervals in the gravity direction or the horizontal direction, and the square soundproofing material may be arranged in the gravity direction and / or Alternatively, they may be arranged at intervals in the horizontal direction. In the case where a single soundproofing material is provided, it is preferable that the soundproofing effect can be expressed uniformly in the air layer. It is preferable to arrange by.

  In the soundproof structure of the present invention, it is preferable that the buffer layer of the soundproof material is disposed on the inner wall side of the first or second surface material. The reason why the soundproofing performance (particularly the effect of reducing the resonance effect) is improved by such a laminated structure is not clear, but can be estimated as follows. That is, a laminated structure in which the buffer layer is sandwiched between the surface material and the mass layer is formed by being disposed on the inner wall side of the surface material on which the buffer layer is laminated. For this reason, when the soundproofing material is disposed on the surface material on the sound source side, the mass layer acts as a weight with respect to the buffer layer sandwiched between the surface material and the mass layer, and the air layer spring in resonance transmission It can be estimated that this is because the effect can be absorbed and reduced by the buffer layer. In addition, when the soundproofing material is disposed on the surface material on the sound receiving side, the buffer layer absorbs the air-borne sound, and in combination with the mass layer, the vibration of the surface material itself is suppressed, thereby resonating. It can be estimated that the transmission can be reduced.

  Furthermore, the soundproofing material may be laminated on any inner wall of the first and second surface materials, but when arranged on the floor structure, from the viewpoint of workability, the inner wall on the ceiling material side (upper side of the ceiling material) It is preferable to arrange in the above.

  The soundproofing material is usually disposed between adjacent horizontal members on the inner wall of the first or second surface material, and is disposed between adjacent columns in the wall or door (door) structure. Preferably, when arranged on the upper side of the ceiling material of the floor structure, it is preferably arranged between adjacent field edges.

  As the surface material, a conventional inorganic surface material or organic surface material can be used.

  The surface material is disposed across at least two horizontal members, and is limited to a mode in which the surface material is disposed across three or five horizontal members as shown in FIGS. 1 and 2. Instead, it may be an aspect in which it is disposed across two horizontal members, an aspect in which it is disposed across four or six or more horizontal members, and the like.

  The horizontal member may be various members constituting the building depending on the type of the soundproof structure. For example, in the case of a wall or door structure, it may be a pillar (intermediate pillar) or a bar, In the case of a structure, it may be a beam, joist, small beam, hanging tree, field edge receiver, field edge, or the like. In the wall or door structure, as shown in FIG. 1, there are usually many structures in which the first and second surface materials are bonded together via a pillar and the thickness of the pillar is the thickness of the air layer of the hollow double wall structure. On the other hand, in the floor structure, as shown in FIG. 2, a hollow double wall structure is often formed by combining a plurality of types of horizontal members. In addition, the combination of horizontal members is not limited to the combination of FIG. 2, For example, the aspect (combination of a beam, a suspension tree, a field edge receiver, and a field edge) which arrange | positioned the suspension tree directly to the beam may be sufficient. . Furthermore, the floor structure may also be a structure in which a floor base material and a ceiling material are bonded to each other through a beam, similarly to the wall structure shown in FIG.

  The horizontal member may be formed of either an inorganic material or an organic material.

In the soundproof structure of the present invention, the hollow double wall structure is a structure in which an air layer is formed between the first surface material and the second surface material. The air layer normally forms a space portion (space room) closed between the first surface material and the second surface material by a pillar, a wall, or the like on the four sides. In a wall or door structure, a space is usually formed between adjacent pillars or crosspieces, and a space divided into a plurality of three or more pillars is formed as an air layer as shown in FIG. Also good. In the floor structure as well as the wall or door structure, the air layer may be formed with a plurality of spaces defined by adjacent beams and joists, and surrounded by four walls as shown in FIG. one space may be formed with. The soundproof structure of the present invention may be a wall or door structure installed in parallel to the weight direction, a floor installed in parallel to the horizontal direction, as long as the soundproof material is laminated on the inner wall of the surface material of the hollow double wall structure It is not limited to a structure, For example, the partition structure etc. which are installed in the diagonal direction may be sufficient.

  The thickness of the air layer (distance between the inner wall of the first surface material and the inner wall of the second surface material) can be selected from a range of about 10 to 500 mm, for example, 30 to 300 mm, preferably 40 to 200 mm, more preferably 50 to 50 mm. It is about 150 mm (especially 80-120 mm). If the thickness of the air layer is too large, the space of the room will be small, and if it is too small, the sound insulation will be reduced.

  The ratio of the thickness of the buffer layer and the air layer may be, for example, the former: the latter = 1: 500 to 1: 2, preferably 1: 100 to 1: 5, and 1:60 to 1:10. It is more preferable that

  The soundproof structure of the present invention exhibits a soundproofing effect over a wide frequency range, for example, 50 to 5000 Hz, preferably 70 to 2500 Hz, more preferably 80 to 2000 Hz, still more preferably 90 to 1000 Hz, and particularly preferably 100. It is effective for a sound having a frequency of about ~ 300.

[Construction method of soundproof structure]
In the construction method of the soundproof structure of the present invention, the soundproofing material is disposed on the inner wall of the first surface material, and the first surface is disposed on one side of a plurality of horizontal members disposed in parallel at intervals. A first surface material fixing step of fixing the material, and a second surface material fixing step of fixing the second surface material to the other side portion side of the adjacent horizontal member.

  In the first surface material fixing step, the order of the placement of the soundproof material on the inner wall of the hollow double wall structure and the fixing of the first surface material to the side portion of the horizontal member is not particularly limited, and the first surface material is After fixing to the side of the column, the soundproofing material may be disposed on the inner wall of the first surface material, and after the soundproofing material is disposed on the inner wall of the first surface material, the first surface material is disposed on the side of the column. It may be fixed to.

  The soundproofing material may be disposed on the inner wall of the first surface material, and may not be fixed when disposed on the upper side of the ceiling material of the floor structure, but is disposed on the wall or door structure. When provided, it is usually fixed to the inner wall of the first surface material. Moreover, even when it is arranged on the upper side of the ceiling material of the floor structure, even if the soundproofing material is fixed to the inner wall of the first surface material (upper surface of the ceiling material) from the viewpoint of preventing workability and positional displacement of the soundproofing material Good.

  As a method of fixing the soundproof material to the inner wall of the first surface material, any of conventional methods, for example, a method using an adhesive or an adhesive, or a method using a fixture such as nails, an adhesive tape, a hook-and-loop fastener, etc. Or a combination of these methods. Of these methods, a method using nails is preferable because of its large fixing force and excellent workability.

  The nails may be any needle-like or rod-like body that can be fixed by penetrating the surface material and the soundproofing material. Examples thereof include nails, nails, screws, staples, screws, and needles. The nails may be driven from either the surface material side or the soundproof material side or from both sides. The arrangement position of the nails is not particularly limited, but is usually arranged at the end and the center. For example, in the band-shaped soundproof material as shown in FIG. 1, the upper end, the center, and the lower end in the length direction, A plurality of nails may be provided for each. Fixing with nails improves workability and also ensures that the soundproofing material can be securely fixed to the first surface material over a long period of time compared to the soundproofing structure secured with an adhesive or adhesive. Can maintain sex. The length of the nails is preferably a length that does not penetrate to the opposite side in order to prevent sound from being transmitted through the nails. For example, when nails are driven from the first surface material side, A length that reaches the middle of the outermost layer is preferable. When nails are driven from the soundproof material side, a length that reaches the middle of the first surface material is preferable.

  As shown in FIG. 1, the second surface material may be directly fixed to the other side of the plurality of horizontal members arranged in parallel at intervals, as shown in FIG. 2, Another horizontal member may be further interposed between the plurality of horizontal members and the second surface material, and the second surface material may be fixed to another horizontal member (such as a field edge).

  The fixing method of the first or second surface material and the horizontal member and the fixing method of the horizontal members are not particularly limited, and the above-described conventional methods can be used.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. Each physical property value in the examples was measured by the following method. In the examples, “parts” and “%” are based on mass unless otherwise specified.

(1) Weight per unit (g / m ² )
The measurement was performed according to JIS L 1913 “General Short Fiber Nonwoven Fabric Test Method”.

(2) Thickness (mm), apparent density (g / cm ³ )
The thickness was measured according to JIS L 1913 “General Short Fiber Nonwoven Fabric Test Method”, and the apparent density was calculated from this value and the basis weight value.

(3) Fiber Adhesion Rate Using a scanning electron microscope (SEM), a photograph in which the cross section of the structure was magnified 100 times was taken. The photograph of the cross section in the thickness direction of the photographed structure is divided into three equal parts in the thickness direction, and the number of fiber cut surfaces (fiber end faces) that can be found in each of the three divided areas (front surface, inside (center), back surface) On the other hand, the ratio of the number of cut surfaces where the fibers are bonded to each other was determined. Of the total number of fiber cross sections that can be found in each region, the ratio of the number of cross sections in a state where two or more fibers are bonded is expressed as a percentage based on the following formula. In addition, in the part which fibers contact, there exists a part which is simply contacting, without melt | fusion, and a part which has adhere | attached by melt | fusion. However, by cutting the structure for microscopic photography, the fibers in contact with each other are separated from each other by the stress of each fiber on the cut surface of the structure. Therefore, in the cross-sectional photograph, it can be determined that the contacting fibers are bonded to each other.

Fiber adhesion rate (%) = (number of cross sections of fibers bonded two or more) / (total number of cross sections of fibers) × 100
However, for each photograph, all the fibers with visible cross sections were counted, and when the number of fiber cross sections was 100 or less, a photograph to be observed was added so that the total fiber cross section number exceeded 100. In addition, the fiber adhesion rate was calculated | required about each area | region divided into three equally, and the ratio (minimum value / maximum value) of the minimum value with respect to the maximum value was also calculated | required together.

(4) Sound transmission loss The quasi-sound transmission loss was measured in the type II test room of JIS A1416: 2000 “Method for measuring air sound blocking performance of building members in the laboratory”. A sound source was installed in the room on the first surface material side, and the air sound blocking performance in the 125 Hz band affected by resonance transmission was evaluated in the wall structures of the example and the comparative example.

[Production Example 1 of Buffer Layer]
As a wet heat adhesive fiber, a core-sheath type composite staple fiber having a core component of polyethylene terephthalate and a sheath component of ethylene-vinyl alcohol copolymer (ethylene content 44 mol%, saponification degree 98.4 mol%) ) "Sophista", fineness 3dtex, fiber length 51mm, core-sheath mass ratio = 50: 50, number of crimps 21 / 25mm, crimp rate 13.5%) was prepared.

Using this core-sheath type composite staple fiber, a card web having a weight per unit area of about 50 g / m ² was prepared by a card method, and four webs were stacked to form a card web having a total per unit area of about 200 g / m ² .

  The card web was transferred to a belt conveyor equipped with a 50 mesh, 500 mm wide stainless steel endless net. In addition, the belt conveyor which has the same metal mesh is equipped in the upper part of the metal mesh of this belt conveyor, and it rotated in the same direction at the same speed, respectively, and used the belt conveyor which can adjust the space | interval of these metal meshes arbitrarily. .

  Next, the steam web is introduced into the steam spraying device provided in the lower conveyor, and steam treatment is performed by ejecting high-temperature steam of 0.2 MPa from the device so as to pass in the thickness direction of the card web (perpendicularly). As a result, a molded body having a non-woven fiber structure was obtained. In this steam spraying device, a nozzle is installed in the lower conveyor so as to spray high-temperature steam toward the web via a conveyor net, and a suction device is installed in the upper conveyor. Further, another jetting device, which is a combination of the arrangement of the nozzle and the suction device reversed, is installed on the downstream side in the web traveling direction of the jetting device, and steam treatment is performed on both the front and back sides of the web. did.

  In addition, the hole diameter of the water vapor | steam injection nozzle was 0.3 mm, and the vapor | steam injection apparatus with which the nozzle was arranged in 1 row at 1 mm pitch along the width direction of the conveyor was used. The processing speed was 3 m / min, and the interval (distance) between the upper and lower conveyor belts on the nozzle side and the suction side was adjusted so that a structure with a thickness of 4 mm was obtained. The nozzles were arranged on the back side of the conveyor belt so as to be almost in contact with the belt.

The obtained non-woven fiber structure (molded body) had a board-like form. The apparent density was 0.05 g / cm ³ . Furthermore, the fiber adhesion rate was 11% on the front surface side, 10% on the center portion, and 10% on the back surface side. This nonwoven fiber structure (buffer material 1) was cut and used as a buffer layer.

[Manufacture example 2 of buffer layer]
A structure having a thickness of 8 mm between the upper and lower conveyor belts on the nozzle side and the suction side using a card web having a total web weight of about 400 g / m ^{2 in} the buffer layer production example 1 To obtain a non-woven fiber structure. The apparent density of the obtained non-woven fiber structure was 0.05 g / cm ³ . Further, the fiber adhesion rate was 11% on the front surface side, 10% on the center portion, and 11% on the back surface side. The nonwoven fiber structure (buffer material 2) was cut and used as a buffer layer.

[Manufacture example 3 of buffer layer]
A structure having a thickness of 2 mm between the upper and lower conveyor belts on the nozzle side and the suction side using a card web having a total web weight of about 100 g / m ^{2 in} the buffer layer production example 1 To obtain a non-woven fiber structure. The apparent density of the obtained non-woven fiber structure was 0.05 g / cm ³ . Further, the fiber adhesion rate was 11% on the front surface side, 10% on the center portion, and 11% on the back surface side. This non-woven fiber structure (buffer material 3) was cut and used as a buffer layer.

[Manufacture example 4 of buffer layer]
In the production example 1 of the buffer layer, a non-woven fibrous structure having a thickness of 4 mm is obtained by adjusting the distance between the upper and lower conveyor belts by using a card web having a total number of webs of about 600 g / m ² , with 12 webs laminated. Manufactured. The apparent density was 0.15 g / cm ³ . Further, the fiber adhesion rate was 56% on the front surface side, 53% on the central portion, and 55% on the back surface side. This nonwoven fiber structure (buffer material 4) was cut and used as a buffer layer.

[Manufacture example 5 of buffer layer]
In the production example 1 of the buffer layer, a non-woven fibrous structure having a thickness of 4 mm is obtained by using a card web having a total number of webs of about 1000 g / m ² and adjusting the distance between the upper and lower conveyor belts. Manufactured. The apparent density was 0.25 g / cm ³ . Further, the fiber adhesion rate was 74% on the front surface side, 71% on the center portion, and 73% on the back surface side. This nonwoven fiber structure (buffer material 5) was cut and used as a buffer layer.

Example 1
As shown in FIG. 1, three pillars having a height of 2,000 mm arranged at intervals of 455 mm (width of the inner wall of the surface material) (the cross-sectional shape perpendicular to the length direction is long side 105 mm × short side 30 mm) , 12 mm-thick plywood board (made by Nissin Co., Ltd.) as the first surface material with respect to the side (short side) of the side (short side) of the column whose long side is arranged in a direction perpendicular to the surface material Structural plywood ”, width 910 mm × height 1820 mm) and 12.5 mm thick gypsum board (“ Tiger Board ”manufactured by Yoshino Gypsum Co., Ltd., width 910 mm × height 1820 mm). They were laminated in the contact order, and fixed at 150 mm intervals using gypsum board screws.

A buffer material 1 having a thickness of 4 mm (width 210 mm × height 2000 mm) is first arranged as a buffer layer in the center between the columns of the plywood board (inner wall) in the first surface material, and then laminated on the buffer material 1. Thus, as the first mass layer, asphalt-containing damping material having a thickness of 4 mm (sheet having a density of 2.8 g / cm ³ formed by heating and mixing asphalt and iron-based inorganic powder, and having a width of 210 mm × high A 12mm-thick plywood board (Nisshin) as a second mass layer so as to be laminated to an asphalt-containing vibration-damping material. “Structural plywood” manufactured by Corporation, width 210 mm × height 2000 mm, density 0.55 g / cm ³ ) was laminated. From the 2nd mass layer side, it fixed with the screw of length 32mm. Furthermore, as the second surface material, a gypsum board having a thickness of 12.5 mm (“Tiger board” manufactured by Yoshino Gypsum Co., Ltd., width 910 mm × height 1820 mm) is a column opposite to the side on which the first surface material is fixed. A soundproof wall in which a soundproof material was laminated on the inner wall of the first surface material was constructed on the side portion of the first surface material using a gypsum board screw fixed at an interval of 150 mm. In the length direction of the column, there are three fixed positions (upper left and right ends and center), two central positions (left and right ends), and lower three positions (left and right ends and center). ) And 8 places in total. The area of the soundproof material occupying the entire inner wall of the first surface material was 50%, and the ratio of the thickness of the buffer layer to the air layer was 4: 105.

Example 2
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer material 2 having a thickness of 8 mm was used as the buffer layer. The thickness ratio of the buffer layer to the air layer was 8: 105.

Example 3
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer material 4 having an apparent density of 0.15 g / cm ³ was used as the buffer layer.

Example 4
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer material 5 having an apparent density of 0.25 g / cm ³ was used as the buffer layer.

Example 5
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer material 3 having a thickness of 2 mm was used as the buffer layer. The thickness ratio of the buffer layer to the air layer was 2: 105.

Example 6
A soundproof structure was constructed in the same manner as in Example 1 except that an asphalt-containing damping material having a thickness of 3 mm was used as the first mass layer.

Example 7
A soundproof structure was constructed in the same manner as in Example 1 except that an asphalt-containing damping material having a thickness of 2 mm was used as the first mass layer.

Example 8
A soundproof structure was constructed in the same manner as in Example 1 except that a plywood board having a thickness of 9 mm was used as the second mass layer.

Example 9
A soundproof structure was constructed in the same manner as in Example 1 except that a plywood board having a thickness of 5.5 mm was used as the second mass layer.

Example 10
A soundproof structure was constructed in the same manner as in Example 1 except that four olefin-based damping materials (“HK-100” manufactured by Nanao Industry Co., Ltd.) having a thickness of 1 mm were used as the first mass layer. .

Comparative Example 1
In Example 1, the soundproof structure was constructed without laminating the soundproof material on the inner wall of the first surface material.

Comparative Example 2
A soundproof structure was constructed in the same manner as in Example 1 except that the first mass layer and the second mass layer were fixed to the inner wall of the first surface material without laminating the buffer layer.

Comparative Example 3
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer layer and the first mass layer were fixed to the inner wall of the first surface material without laminating the second mass layer.

Comparative Example 4
A soundproof structure was constructed in the same manner as in Example 1 except that the buffer layer and the second mass layer were fixed to the inner wall of the first surface material without laminating the first mass layer.

Reference Example A soundproof structure was constructed in the same manner as in Example 1 except that only the asphalt-containing damping material having a thickness of 8 mm was fixed to the first surface material without laminating the buffer layer and the second mass layer.

  Table 1 shows the evaluation results of the soundproof structures obtained in Examples 1 to 10, Comparative Examples 1 to 4, and Reference Example.

  As is clear from the results in Table 1, the soundproof structure of the example exhibited superior sound absorption (sound transmission loss) compared to the soundproof structure of the comparative example.

  In particular, when Example 1 is compared with Comparative Examples 2 to 4, the sound transmission loss of the soundproof structure of Example 1 is 25 dB, which is 2 dB or more higher than the sound transmission loss of the soundproof structure of Comparative Examples 2 to 4. It showed a remarkable effect.

  Since the soundproofing material of the present invention has high soundproofing properties, the soundproofing of buildings (for example, houses, factory houses and facilities, buildings, hospitals, schools, gymnasiums, cultural halls, public halls, concert halls, highways) It can be effectively used as a soundproofing material used for soundproofing walls or doors (partitions), floors, etc. such as walls) and vehicles (for example, vehicles such as automobiles, airplanes, etc.). In particular, since it has high sound insulation even in a low frequency range, it is also suitable for soundproof walls or doors that require advanced acoustic equipment such as concert halls, and soundproof floors.

DESCRIPTION OF SYMBOLS 1,11 ... Soundproof structure 2,12 ... 1st surface material 2a ... Gypsum board 2b ... Plywood board 3,13 ... 2nd surface material 4,14 ... Horizontal member 5,15 ... Air layer 6,16 ... Soundproofing material 6a ... Buffer layer 6b ... Mass layer 6b1 ... First mass layer 6b2 ... Second mass layer 12a ... Floor finishing material 12b ... Floor base material 14a ... Beam 14b ... Small beam 14c ... Suspended tree 14d ... Field edge receiver 14e ... Field edge 17 ... Wall

Claims (11)

A soundproofing material capable of contacting an inner wall of a hollow double-walled structure having an air layer inside and for isolating air-borne sound,
A buffer layer having an apparent density of 0.03 to 0.7 g / cm ³ formed of the buffer material, and a mass layer having a density higher than the buffer layer ;
Before SL mass layer, viewed contains a first mass layer, and a second mass layer having a density less than the first mass layer,
The density ratio of the first mass layer to the second mass layer is the former: the latter = 10: 9 to 10: 1, and
The soundproofing material in which the ratio of the thickness of the first mass layer to the second mass layer is the former: the latter = 1: 1 to 1:10 . Soundproofing material according to claim 1, wherein the density of the first mass layer is 1 g / cm ³ or more. Buffer layer, the first mass layer, according to claim 1 or 2 soundproofing material according that are laminated in this order in the second mass layer. The buffer material forming the buffer layer is a non-woven fiber structure including wet heat adhesive fibers, and the fibers are fixed by fusion of the wet heat adhesive fibers, and the non-woven fiber structure has a fiber adhesion rate. The soundproof material according to any one of claims 1 to ³ , which has a density of ³ to 85% and an apparent density of 0.05 to 0.2 g / cm3.   The soundproofing material according to any one of claims 1 to 4, wherein the first mass layer is formed of a vibration damping material containing asphalt.   The soundproof material according to any one of claims 1 to 5, wherein the second mass layer is formed of a wood material.   A hollow duplex in which a plurality of horizontal members are interposed in parallel with a space between the first surface material and the second surface material, and an air layer is formed between the first surface material and the second surface material. It is a soundproof structure which has a wall structure, Comprising: The soundproof structure by which the soundproof material in any one of Claims 1-6 is arrange | positioned in the inner wall of the 1st or 2nd surface material in the said air layer.   The soundproof structure according to claim 7, wherein the ratio of the thickness of the buffer layer to the air layer is the former: the latter = 1: 500 to 1: 2.   The soundproof structure according to claim 7 or 8, wherein a buffer layer of the soundproof material is laminated on an inner wall of the first or second surface material.   The soundproof structure according to any one of claims 7 to 9, which has a floor structure in which the first or second surface material is a ceiling material and a soundproof material is laminated on the upper side of the ceiling material.   The soundproof material according to any one of claims 1 to 6 is disposed on the inner wall of the first surface material, and the first surface is disposed on one side of a plurality of horizontal members disposed in parallel at intervals. The construction method of a soundproof structure including the 1st surface material fixing process which fixes a material, and the 2nd surface material fixing process which fixes a 2nd surface material to the other side part side of an adjacent horizontal member.

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