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WO2018159504A1 - Matériau de protection pour isolation acoustique et groupe moteur - Google Patents

Matériau de protection pour isolation acoustique et groupe moteur Download PDF

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Publication number
WO2018159504A1
WO2018159504A1 PCT/JP2018/006788 JP2018006788W WO2018159504A1 WO 2018159504 A1 WO2018159504 A1 WO 2018159504A1 JP 2018006788 W JP2018006788 W JP 2018006788W WO 2018159504 A1 WO2018159504 A1 WO 2018159504A1
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WO
WIPO (PCT)
Prior art keywords
porous body
covering material
soundproofing
elastic porous
soundproof
Prior art date
Application number
PCT/JP2018/006788
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English (en)
Japanese (ja)
Inventor
荒井　剛
生磨 藤澤
森　正
Original Assignee
ニチアス株式会社
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Filing date
Publication date
Application filed by ニチアス株式会社 filed Critical ニチアス株式会社
Publication of WO2018159504A1 publication Critical patent/WO2018159504A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation

Definitions

  • the present invention relates to a soundproofing covering material and an engine unit.
  • the noise of the automobile is generated from the engine room because it is not only the noise generated from the drive system engine room such as the engine, motor and transmission, but also the exhaust sound, wind noise, tire road noise and the like.
  • the noise of the automobile is generated from the engine room because it is not only the noise generated from the drive system engine room such as the engine, motor and transmission, but also the exhaust sound, wind noise, tire road noise and the like.
  • the conventionally proposed soundproof covers do not always have a sufficient noise suppression effect against the increasingly strict regulation level.
  • the entire engine which is a sound source
  • almost the entire engine that is, almost the entire engine wall, upper surface (bonnet) side, lower surface (underbody) side.
  • Covering with soundproofing material to suppress noise leakage outside the vehicle and at the same time reduce the noise level in the engine room by its sound absorption effect, (Near) engine encapsulation can be considered.
  • the thickness provided for the soundproofing material is about 10 to 20 mm even when encapsulating.
  • the effect obtained because the noise on the relatively low frequency side of 1 kHz or less depends on the thickness and mass of the soundproofing material. Is extremely limited.
  • the soundproofing material cannot exhibit sufficient sound absorption performance, a large reverberation sound will sound in the engine room, and if the sound insulation performance is not sufficient, the energy that cannot be attenuated will vibrate the wall, upper surface, and lower surface of the engine room, Further loud noise may be generated.
  • Helmholtz structure with a space (back air layer) between the inner side of the soundproof material, the engine wall surface, and the inner wall of the engine room facing the soundproof material surface as a means to obtain a soundproof effect at a relatively low frequency with a thin soundproof material thickness
  • the sound absorption peak exists in a relatively low frequency range
  • the engine room wall on the back side will vibrate greatly.
  • a part of the exhaust side wall surface and the upper surface of the engine can reach a temperature of about 300 ° C. What has predetermined heat resistance is calculated
  • an object of the present invention is to provide a novel soundproofing covering material having heat resistance and sufficient soundproofing performance even if the thickness is thin, and an engine unit having such a soundproofing covering material. It is what.
  • the first elastic porous body and a porous film having a porosity of 0.1 to 5% and a pore diameter of 50 to 500 ⁇ m It discovered that the said technical subject could be solved by the coating material for soundproofing laminated
  • the present invention (1) A first elastic porous body, a porous film having an opening ratio of 0.1 to 5% and an opening diameter of 50 to 500 ⁇ m, and a second elastic porous body are laminated in this order.
  • Soundproofing covering material characterized by being made
  • the soundproofing covering material according to (1), wherein the porous film has a ventilation resistance of 0.1 to 1.0 kPa ⁇ s / m
  • the present invention it is possible to provide a novel soundproofing covering material having heat resistance and sufficient soundproofing performance even if the thickness is thin, and an engine unit having such a soundproofing covering material.
  • the soundproofing covering material according to the present invention includes a first fibrous assembly, a porous film having an opening ratio of 0.1 to 5% and an opening diameter of 50 to 500 ⁇ m, and a second elastic porous body. Are stacked in this order.
  • the porous film has a porosity of 0.1 to 5% and a diameter of 50 to 500 ⁇ m.
  • the constituent material of the porous film is not particularly limited, and a material having a desired pore distribution may be appropriately selected.
  • the porous film has flexibility and is not sandwiched between a first elastic porous body and a second elastic porous body, which will be described later, and does not cause significant heat shrinkage in a use environment. preferable.
  • Examples of such a porous film include a polyethylene film, a 6-nylon film, a 6,6-nylon film, an 11-nylon film, a 12-nylon film, and the like, and a polyester.
  • a polyethylene film a polyethylene film
  • a 6-nylon film a 6,6-nylon film
  • an 11-nylon film a 12-nylon film
  • a polyester a polyester
  • organic films such as films, short fiber nonwoven fabrics, long fiber cloths and papermaking papers can be mentioned.
  • the porous film may be composed of a multilayer film, and examples of the multilayer film include a co-extruded multilayer film manufactured such that a low-pressure polyethylene adhesive layer is disposed on both sides of a polyamide (nylon) film. Can do.
  • the porous film By using the porous film, adhesion to a first elastic porous body and a second elastic porous body described later can be easily improved.
  • the porous film may be obtained by appropriately applying a coating agent on the surface.
  • the porous film has a porosity of 0.1 to 5%, preferably 0.1 to 3%, preferably 0.15 to 3%. Is more preferable.
  • the porous film has a pore diameter of 50 to 500 ⁇ m, preferably 100 to 500 ⁇ m, more preferably 100 to 300 ⁇ m.
  • the porosity (%) of the porous film is determined by observing the surface of the porous film with a microscope (Keyence Corp., VHX-500) (total area of pores / porosity of the porous film).
  • (Area) x100 means the arithmetic average value at an arbitrary 50 positions of the opening ratio.
  • the total area of the hole means a value measured with a microscope.
  • the pore diameter of the porous film means an arithmetic average value of the maximum diameters of 50 holes when the surface of the porous film is observed with a microscope.
  • the porous film constituting the soundproofing covering material according to the present invention has a porous film having the above-described opening ratio and opening diameter, so that sound can be heard from the outside while exhibiting heat resistance.
  • By easily controlling the flow resistance when passing it is possible to easily reduce the sound pressure at a desired frequency, particularly in the vicinity of a frequency of 1600 to 2000 Hz, while exhibiting desired heat resistance. That is, it is considered that the sound absorption performance can be improved by adjusting the flow resistance of the entire soundproofing laminate by disposing the slightly breathable film material in the center of the covering material.
  • the opening portion of the porous film is formed by subjecting the film material constituting the porous film to an opening treatment such as a needle punching treatment or passing a thermal sword mountain roll.
  • an opening treatment such as a needle punching treatment or passing a thermal sword mountain roll.
  • the aperture ratio and the aperture diameter of the porous film can be easily controlled by controlling the processing conditions during the aperture processing.
  • the porous film preferably has a ventilation resistance of 0.1 to 1.0 kPa ⁇ s / m, preferably 0.1 to 0.5 kPa ⁇ s / m. Is more preferably 0.1 to 0.2 kPa ⁇ s / m, and still more preferably 0.1 to 0.16 kPa ⁇ s / m.
  • the airflow resistance of the porous film is measured by measuring the flow resistance at the inlet side and the outlet side when air is passed in the direction perpendicular to the main surface of the porous film at 0.5 m / s. It means the difference (differential pressure) between the two when measured with a container (manufactured by Nippon Acoustic Co., Ltd.)
  • the soundproofing covering material according to the present invention has a porous film having the above-mentioned ventilation resistance, so that the flow resistance when sound passes through the covering material from the outside can be easily controlled, and the desired frequency, particularly the frequency Sound pressure in the vicinity of 1600 to 2000 Hz can be easily reduced.
  • the Young's modulus of the porous film is preferably 0.1 GPa or less, more preferably 0.05 GPa or less, and further preferably 0.01 GPa or less.
  • the porous film has a desired flexibility, is excellent in flexibility, etc., and can easily provide a soundproofing coating material excellent in sound absorption. it can.
  • the Young's modulus of the porous film means a value measured in accordance with JIS K7127.
  • the thickness of the porous film is preferably 20 to 100 ⁇ m, more preferably 10 to 80 ⁇ m, and further preferably 30 to 70 ⁇ m.
  • the thickness of the porous film is within the above range, it is excellent in flexibility and can be easily reduced in thickness (compacted).
  • the density of the porous film is preferably 0.8 to 1.4 g / cm 3 , more preferably 1.0 to 1.3 g / cm 3 , More preferably, it is 1.1 to 1.2 g / cm 3 .
  • the density of the porous film is within the above range, it is possible to easily provide a soundproof coating material that is lightweight and excellent in flexibility.
  • the soundproofing covering material according to the present invention is characterized in that the first elastic porous body, the porous film, and the second elastic porous body are laminated in this order. .
  • the first elastic porous body and the second elastic porous body may be the same or different.
  • one or more selected from fiber assemblies and the like can be used as the elastic porous body constituting the first elastic porous body, and the elastic porous body constituting the second elastic porous body
  • the material include one or more selected from fiber assemblies, felts, and resin foams.
  • the assembly which consists of inorganic short fibers, such as glass wool (glass fiber), rock wool, a silica fiber, a silica alumina ceramic fiber, an alumina fiber, a mullite fiber, can be mentioned, for example.
  • the felt include one obtained by mixing one or more of the above-mentioned various short fibers by means such as a needle punch, and specifically, an inorganic fiber comprising inorganic short fibers that already form an assembly.
  • felt Made of felt (eg glass felt made of glass wool (glass fiber felt), polyester fiber felt such as polyethylene terephthalate felt, nylon fiber felt, polyethylene fiber felt, polypropylene fiber felt, acrylic fiber felt, aramid fiber felt, silica
  • resin felts obtained by processing alumina ceramic fiber felt, siri-force fiber felt, cotton, wool, wood wool, scrap fibers, etc. into a felt shape with a thermosetting resin.
  • an inorganic fiber felt is preferable, a density of 10 to 50 kg / m 3 is preferable, a density of 15 to 50 kg / m 3 is more preferable, and a density of 20 to 35 kg / m 3 is more preferable.
  • the resin foam one or more selected from resin foams such as polyurethane foam, polyethylene foam, polypropylene foam, phenol foam, melamine foam, nitrile butadiene rubber, chloroprene rubber, styrene rubber, silicone rubber, urethane rubber, ethylene -One or more types selected from open-cell bodies obtained by foaming propylene / diene rubber or the like in the form of open cells, or foamed by foaming after crushing or the like can be mentioned.
  • resin foams such as polyurethane foam, polyethylene foam, polypropylene foam, phenol foam, melamine foam, nitrile butadiene rubber, chloroprene rubber, styrene rubber, silicone rubber, urethane rubber, ethylene -One or more types selected from open-cell bodies obtained by foaming propylene / diene rubber or the like in the form of open cells, or foamed by foaming after crushing or the like can be mentioned.
  • the elastic porous body preferably includes inorganic fibers such as glass fibers or aramid fibers as constituent fibers, and more preferably includes inorganic fibers.
  • the soundproofing covering material according to the present invention is used for a soundproofing cover for an automobile engine, for example, the exhaust side wall surface and a part of the upper surface (near the exhaust manifold through which combustion exhaust gas passes) are at a high temperature. The material surface reaches a temperature of about 300 ° C., and under such temperature conditions, the film material is melted or significantly contracted.
  • the first elastic porous body or the second elastic porous body preferably includes a glass fiber as a constituent fiber, and the glass fiber preferably has a fiber diameter of 0.1 to 4 ⁇ m. More preferably, it is 1 to 4 ⁇ m, and further preferably 3 to 4 ⁇ m.
  • the glass fiber having the above fiber diameter can be produced by a centrifugal method or a flame method.
  • the fiber diameter of a glass fiber means the arithmetic mean value of the maximum diameter of 20 glass fibers measured with the microscope.
  • the first elastic porous body or the second elastic porous body contains glass fibers having the above-mentioned fiber diameter as constituent fibers, so that desired heat resistance and flame retardancy can be obtained. It can be exhibited more easily.
  • the first elastic porous body or the second elastic porous body contains glass fibers having the above fiber diameter as constituent fibers
  • the first elastic porous body is formed by fixing glass fibers with a binder made of a phenol resin selected from, for example, novolak, resol, benzylic ether, or the like, or a modified phenol resin such as urea modification.
  • a binder made of a phenol resin selected from, for example, novolak, resol, benzylic ether, or the like, or a modified phenol resin such as urea modification.
  • it may be produced by entanglement of glass fibers in the thickness direction by treatment such as needle punching.
  • the polyester fiber is preferably a flame-retardant polyester fiber.
  • Examples of the flame retardant polyester fiber include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene isophthalate (PEI), polycyclohexylenedimethylene terephthalate (PCHDT), polyethylene naphthalate (PEN), and the like. Can be mentioned.
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEI polyethylene isophthalate
  • PCHDT polycyclohexylenedimethylene terephthalate
  • PEN polyethylene naphthalate
  • Examples of the flame retardant polyester fiber include known ones, such as those described in JP-A-51-82392, JP-A-55-7888, JP-B-55-41610, and the like. Things can be mentioned.
  • the polyester fiber is a flame-retardant polyester and a thermal adhesive property. It may be a flame retardant composite fiber obtained by combining polyester.
  • examples of the flame retardant polyester include the same ones as those constituting the flame retardant polyester fiber described above.
  • the thermal adhesive polyester functions as a binder for the flame retardant polyester, has a melting point lower than the melting point of the flame retardant polyester, and the melting point of the flame retardant polyester. Those having a melting point which is at least 20 ° C. lower than that are preferred.
  • the difference between the melting points is less than 20 ° C.
  • high-temperature treatment is required during the production of the flame-retardant composite fiber, so the orientation of the flame-retardant polyester is likely to be reduced, and the reinforcing effect of the heat-adhesive polyester is reduced.
  • the durability of the flame-retardant-added fiber is likely to be lowered, and the physical properties of the flame-retardant polyester as a base material are likely to be lowered.
  • the thermal adhesive polyester preferably has a melting point of 110 ° C. to 220 ° C., more preferably 130 ° C. to 200 ° C. When the melting point of the heat-adhesive polyester is within the above range, the reinforcing effect is easily exhibited.
  • the melting point of the flame-retardant polyester and the melting point of the heat-adhesive polyester are the orientation when the fiberized product is arranged in a cross shape on the hot plate and heated from room temperature at 5 ° C./min. It means the temperature at which the striped pattern generated by
  • the thermal adhesive polyester is not particularly limited.
  • terephthalic acid isophthalic acid, phthalic acid, p-hydroxybenzoic acid, 5-sodium sulfoisophthalic acid, naphthalenedicarboxylic acid, oxalic acid, adipic acid, sebacic acid,
  • acid components selected from cyclohexylene dicarboxylic acid and the like, and one or more glycols selected from ethylene glycol, diethylene glycol, triethylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentyl glycol, polyethylene glycol, and the like
  • ester-bonding a component is mentioned.
  • the first elastic porous body or the second elastic porous body constitutes a flame-retardant composite fiber in which the flame-retardant polyester and the heat-adhesive polyester are combined.
  • the composite ratio of the flame-retardant polyester and the heat-adhesive polyester is not particularly limited, but the flame-retardant polyester content is preferably 20 to 80% by mass, preferably 30 to 70% by mass. Some are more preferable, and 40 to 60% by mass is even more preferable.
  • the content ratio of the flame-retardant polyester constituting the flame-retardant composite fiber is within the above range, desired flame retardancy can be easily imparted to the flame-retardant composite fiber.
  • a seascore type in which the flame-retardant polyester is a core component and the heat-adhesive polyester is a sheath component, the flame-retardant polyester and the heat-adhesive polyester are arranged adjacent to each other.
  • a layered multilayer structure type or a side-by-side type can be used.
  • the thickness of the first elastic porous body or the second elastic porous body may be the same or different.
  • the thickness of the first elastic porous body or the second elastic porous body is preferably 0.5 to 20 mm, more preferably 1.5 to 15 mm, and further preferably 3 to 10 mm. preferable.
  • the sound resistance is excellent and the sound absorbing coating material is thinned (compact) and has sufficient sound absorption. It can be easily demonstrated.
  • the density of the first elastic porous body or the second elastic porous body may be the same or different.
  • the density of the first elastic porous body or the second elastic porous body is preferably 0.001 to 1.2 g / cm 3 , and is preferably 0.003 to 0. more preferably .5g / cm 3, more preferably from 0.006 ⁇ 0.1g / cm 3.
  • the density is appropriately selected from those having desired sound absorption properties according to the structure and thickness of the elastic porous body.
  • the basis weight of the first elastic porous body or the second elastic porous body is preferably 10 to 1000 g / m 2 , and more preferably 15 to 500 g / m 2. A range of 25 to 250 g / m 2 is more preferable.
  • the basis weight of the first elastic porous body or the second elastic porous body is within the above range, it is possible to easily provide a soundproofing covering material that is lightweight and has a desired shape.
  • the soundproofing covering material according to the present invention has the first elastic porous body or the second elastic porous body on the upper surface side and the lower surface side of the porous film, respectively. Sound absorption characteristics can be exhibited not only for sound passing from the lower surface side to the upper surface side but also for sound passing from the upper surface side to the lower surface side. For this reason, for example, when the soundproofing covering material according to the present invention is used as a soundproofing cover for an automobile engine, when the sound emitted from the automobile engine passes from the lower surface side to the upper surface side of the soundproofing covering material, An engine room that can convert the noise energy generated into vibration energy of the elastic porous body to exhibit a desired sound absorbing performance and accommodates the automobile engine and the soundproof covering material through the soundproof covering material.
  • the energy of the reflected noise is also converted into the vibration energy of the elastic porous material to further exhibit sound absorbing performance. can do.
  • a porous film having a predetermined aperture ratio and an aperture diameter exists between the first elastic porous body and the second elastic porous body, when passing through the soundproof coating material, as a result of the predetermined flow resistance, the sound generated from the automobile engine and passing through the porous film resonates with the sound reflected from the wall of the engine room to attenuate the energy, especially in the frequency band of 1600 Hz to 2000 Hz. It is considered that the pressure can be reduced.
  • the soundproofing covering material according to the present invention may further include a skin material on at least one of the outer surface side of the first elastic porous body and the outer surface side of the second elastic porous body.
  • the skin material is preferably provided on at least one of the outer surface side of the first elastic porous body and the outer surface side of the second elastic porous body. More preferably, it is provided.
  • both skin materials are the same. May be different.
  • the skin material at least one kind selected from inorganic long fiber cloth, inorganic fiber sheet, metal foil resin sheet subjected to opening treatment, etc., as long as no trouble such as melting or significant shrinkage occurs at a temperature of 300 ° C. Can be arranged.
  • one or more mixtures selected from inorganic fibers such as glass fiber, silica fiber, basalt fiber, silica alumina ceramic fiber, alumina fiber, and mullite fiber are knitted into a cross shape or integrated by means such as needle punching.
  • a sheet or a metal foil such as an aluminum foil in which fine apertures are provided on the surface to suppress reflection of sound can be preferably used from the viewpoints of design properties and prevention of fiber scattering due to vibration.
  • the airflow resistance of the skin material may be within a range that does not interfere with the effects of preventing fiber scattering, etc. in order to suppress the reflection of incident sound waves on the surface side, and is 1.0 kPa ⁇ s / m or less.
  • the ventilation resistance can be appropriately adjusted depending on how the fibers are knitted and the degree of opening of the metal foil.
  • the airflow resistance of the skin material is determined by measuring the pressure at the inlet side and the outlet side when air is passed at a rate of 0.5 mm / s in the direction perpendicular to the main surface of the skin material. It means the difference (differential pressure) between the two when measured by Nippon Acoustic Co., Ltd.
  • the inorganic fiber sheet examples include glass fiber felts containing glass fibers and resin binders, and the resin binders constituting the glass fiber felts include novolaks, resols, and the like, whose content is less than 5% by mass.
  • examples thereof include phenolic resins such as benzylic ethers, and modified phenolic resins such as urea modified with a content of 10 to 20% by mass.
  • the porosity is preferably 3% to 7%, more preferably 4% to 7%, More preferably, it is 5% to 7%.
  • the metal foil has a hole diameter of 1 ⁇ m or more, preferably 5 ⁇ m or more, and preferably 10 ⁇ m or more, within a range in which a liquid-stopping property can be secured. More preferred.
  • the hole area ratio and the hole diameter of the skin material can be measured by the same measurement method as the method for measuring the hole area ratio and the hole diameter of the porous film described above.
  • the thickness of the skin material is preferably 9 to 1000 ⁇ m, more preferably 9 to 500 ⁇ m, and further preferably 10 to 300 ⁇ m.
  • the thickness of the skin is within the above range, it is possible to easily exhibit sufficient sound absorption properties while being excellent in flexibility and thinning (compacting) the soundproofing covering material.
  • the covering material for soundproofing according to the present invention has a skin material, it becomes easy to ensure shape stability and design properties, and it is possible to suppress scattering of fibers constituting the covering material at the time of use, It can easily exhibit water repellency.
  • the soundproofing covering material according to the present invention preferably has a ventilation resistance of 1.0 to 4.0 kPa ⁇ s / m, more preferably 1.0 to 3.0 kPa ⁇ s / m or less. More preferably, the viscosity is 0.0 to 2.0 kPa ⁇ s / m or less.
  • the airflow resistance is measured by measuring the air pressure at the inlet side and the outlet side when air is passed at a rate of 0.5 mm / s in the direction perpendicular to the main surface of the soundproof coating material, respectively. It means the difference (difference pressure) between the two when measured by (Sound Co., Ltd.).
  • the soundproofing covering material according to the present invention is suitably 5 to 20 mm in thickness, more suitably 10 to 20 mm, and even more suitably 15 to 20 mm.
  • the soundproofing covering material according to the present invention can exhibit sufficient soundproofing performance even when the thickness is thin.
  • the soundproofing covering material according to the present invention has the above airflow resistance, it is possible to easily control the flow resistance and easily reduce the sound pressure at a desired frequency, particularly in the vicinity of the frequency of 1600 to 2000 Hz.
  • the soundproofing covering material according to the present invention can be produced, for example, by hot pressing into a predetermined shape in a state where all of the forming materials corresponding to the constituent members of the soundproofing covering material to be obtained are sequentially laminated.
  • the soundproofing covering material according to the present invention is, for example, one formed by hot pressing into a predetermined shape in a state where only a part of all the forming materials corresponding to the constituent members of the soundproofing covering material to be obtained is sequentially laminated.
  • other forming materials corresponding to the constituent members of the covering material for soundproofing to be obtained can be prepared by fixing them by hot pressing to a predetermined shape in a state of being sequentially laminated with an adhesive or the like as appropriate. .
  • the soundproofing covering material for example, (1) a first elastic porous body, (2) a porous film, and (3) a second elastic porous body are sequentially arranged in this order.
  • a laminated soundproofing covering material it can be produced by hot-pressure forming into a predetermined shape in a state in which the forming materials for forming these are sequentially laminated in this order.
  • a first skin material, (2) a first elastic porous body, (3) a porous film, and (4) a second elastic porous body are sequentially laminated in this order.
  • the covering material can be manufactured by hot pressing into a predetermined shape in a state where the forming materials for forming the covering materials are sequentially laminated in this order. Furthermore, (1) the first skin material, (2) the first elastic porous body, (3) the porous film, (4) the second elastic porous body, and (5) the second skin material are In the case of forming a soundproof covering material that is sequentially laminated in order, it can be produced, for example, by hot-pressing a forming material for forming each of them into a predetermined shape in a state of being sequentially laminated in this order.
  • the soundproof covering material according to the present invention can be suitably used, for example, as a soundproof cover for an automobile engine.
  • the soundproofing covering material according to the present invention is used as a soundproofing cover for an automobile engine, for example, by arranging it on at least a part of the exhaust side wall surface and the upper surface of the engine, suitable sound absorption characteristics can be easily exhibited. .
  • An engine unit according to the present invention includes an automobile engine, a soundproof coating material according to the present invention that covers at least a part of the vehicle engine, and an engine room that houses the automobile engine and the soundproof coating material.
  • the details of the soundproofing covering material according to the present invention are as described above. Moreover, in the engine unit according to the present invention, a well-known one can be appropriately employed as the automobile engine and the engine room.
  • the distance between the soundproofing covering material and the engine room is 0.1 to 30 mm, from the viewpoint of space saving. Is preferably 5 to 20 mm, and more preferably 5 to 15 mm.
  • the first elastic porous body and the second elastic porous body constituting the soundproofing covering material are provided with a porous film having a predetermined aperture ratio and an aperture diameter.
  • Example 1 In a molding die provided with a molding surface corresponding to the target shape to be obtained, (1) as a first elastic porous body forming material, glass fiber felt (manufactured by Nippon Inorganic Co., Ltd. Filatomica 30MY (glass fiber Of fiber diameter 3.5 ⁇ m, density 30 kg / m 3 , weight per unit area 300 g / m 2 , thickness 10 mm)), and (2) 6-nylon as a porous film forming material By passing the film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modulus 10 kPa) through a hot sword mountain roll, the opening part (opening ratio 2.5%, A film having an opening diameter of 200 ⁇ m and a ventilation resistance of 0.11 kPa ⁇ s / m; and (3) glass fiber felt (Filatomector 30 manufactured by Nippon Inorganic Co., Ltd.) as the second elastic porous body
  • Y fiber diameter 3.5 ⁇ m glass fiber, density 30kg / m 3, a basis weight 300 g / m 2, thickness 10 mm
  • Y fiber diameter 3.5 ⁇ m glass fiber, density 30kg / m 3, a basis weight 300 g / m 2, thickness 10 mm
  • a soundproof cover for an automobile engine having a maximum thickness of 10 mm having a ventilation resistance of 2.3 kPa ⁇ s / m, in which the four sides of the end portion made of the laminate of the two elastic porous bodies are compressed and welded and sealed.
  • the first elastic porous body is arranged to be on the heat source side, and is placed on a hot plate heated to 300 ° C. so that the second elastic porous body side is Heat resistance was evaluated by allowing the porous film to stand at an ambient temperature of 24 ° C. and measuring the temperature of the porous film with a CA thermocouple until the temperature became steady.
  • the temperature of the porous film disposed in the center portion remains at 128 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is the temperature of the softening point temperature of 6-nylon, which is the film substrate, of 140 ° C. or less. So it was not damaged.
  • Example 2 In a molding die provided with a molding surface corresponding to the target shape to be obtained, (1) as a first elastic porous body forming material, glass fiber felt (manufactured by Nippon Inorganic Co., Ltd. Filatomica 30MY (glass fiber Of fiber diameter 3.5 ⁇ m, density 30 kg / m 3 , weight per unit area 300 g / m 2 , thickness 10 mm)), and (2) 6-nylon as a porous film forming material By passing the film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modulus 10 kPa) through a hot sword mountain roll, the opening part (opening ratio 2.5%, (3) Polyester fiber felt (S250-HSGY manufactured by Takayasu Co., Ltd.) as a forming material for the second elastic porous body, and a film having a ventilation resistance of 0.11 kPa ⁇ s / m provided with
  • the temperature of the porous film disposed in the center portion remains at 128 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is the temperature of the softening point temperature of 6-nylon, which is the film substrate, of 140 ° C. or less. So it was not damaged.
  • the soundproof property of the obtained soundproof cover was evaluated in the same manner as in Example 1. As shown in Table 1 and FIG. 1, the obtained soundproof cover exhibited good sound absorption on both the engine side and the outer surface side during installation.
  • Example 3 In a molding die provided with a molding surface corresponding to the target shape to be obtained, (1) glass fiber felt (Firatomica FM-24 manufactured by Nippon Inorganic Co., Ltd.) as a first elastic porous body forming material Glass fiber diameter 3.5 ⁇ m, density 24 kg / m 3 , basis weight 120 g / m 2 , thickness 5 mm)), and (2) 6- A nylon film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modulus 10 kPa) is passed through a thermal sword mountain roll to open a hole (opening ratio 2.5).
  • glass fiber felt Fiber diameter 3.5 ⁇ m, density 24 kg / m 3 , basis weight 120 g / m 2 , thickness 5 mm
  • 6- A nylon film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modul
  • a film airflow resistance having a pore size 200 [mu] m) is 0.11 kPa ⁇ s / m, Nippon Muki Co. Firatomikuta FM-24 (glass fiber fiber diameter 3.5 [mu] m, density 24 kg / m 3, Eye The amount 120 g / m 2, sequentially arranged thickness 5 mm)) in this order under 5MPa in pressure by 30 seconds heat pressure molding at 185 ° C., the maximum thickness of the first elastic porous body 5 mm, 4 sides of the end portion consisting of a laminate of a porous film having a maximum thickness of 0.07 mm and an aperture diameter of 2.5% and an aperture diameter of 200 ⁇ m and a second elastic porous body having a maximum thickness of 5 mm are compressed, A soundproof cover for an automobile engine having a maximum thickness of 10 mm having a ventilation resistance of 2.0 kPa ⁇ s / m, which was welded and sealed, was obtained.
  • ⁇ Heat resistance evaluation> Using the obtained soundproof cover for an automobile engine, the first elastic porous body was placed on the heat source side, and the heat resistance was evaluated in the same manner as in Example 1. As a result, the temperature of the porous film disposed in the center portion remains at 131 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is the temperature of the softening point temperature of 6-nylon, which is the base material of the film, of 140 ° C. or less. So it was not damaged. ⁇ Soundproof evaluation> The soundproof property of the obtained soundproof cover was evaluated in the same manner as in Example 1. As shown in Table 1 and FIG. 1, the obtained soundproof cover exhibited good sound absorption on both the engine side and the outer surface side during installation.
  • Example 4 In a molding die provided with a molding surface corresponding to the target shape to be obtained, (1) glass fiber felt (Firatomica FM-24 manufactured by Nippon Inorganic Co., Ltd.) as a first elastic porous body forming material Glass fiber diameter 3.5 ⁇ m, density 24 kg / m 3 , basis weight 120 g / m 2 , thickness 5 mm)), and (2) 6- A nylon film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modulus 10 kPa) is passed through a thermal sword mountain roll to open a hole (opening ratio 2.5).
  • glass fiber felt Fiber diameter 3.5 ⁇ m, density 24 kg / m 3 , basis weight 120 g / m 2 , thickness 5 mm
  • 6- A nylon film (Supele 35N-LL, manufactured by Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modul
  • ⁇ Heat resistance evaluation> Using the obtained soundproof cover for an automobile engine, the first elastic porous body was placed on the heat source side, and the heat resistance was evaluated in the same manner as in Example 1.
  • the temperature of the porous film disposed in the center portion remains at 131 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is the temperature of the softening point temperature of 6-nylon, which is the base material of the film, of 140 ° C. or less. So it was not damaged.
  • the soundproof property of the obtained soundproof cover was evaluated in the same manner as in Example 1. As shown in Table 1 and FIG. 1, the obtained soundproof cover exhibited good sound absorption on both the engine side and the outer surface side during installation.
  • Example 5 In a mold provided with a molding surface corresponding to the target shape to be obtained, (1) Silica cloth (silicas cloth 700 manufactured by Nichias Co., Ltd., fiber diameter 7 ⁇ m, density 1053 kg / m 3 , basis weight 569 g / m 2 , thickness 0.54 mm), (2) glass fiber felt (Firatomica 600-1-KS (glass) manufactured by Nippon Mining Co., Ltd.) as the first elastic porous body forming material Fiber diameter 1.0 ⁇ m, density 19 kg / m 3 , weight per unit area 95 g / m 2 , thickness 5 mm)), and (3) 6-nylon as a porous film forming material A hole-opening part (opening ratio of 2.5) is passed through a thermal sword mountain roll through a film-made film (Supele 35N-LL, Ube Film Co., Ltd., density 70 kg / m 3 , thickness 0.07 mm, Young's modulus 10 kPa) %, A film having an
  • a first skin material having a maximum thickness of 0.5 mm, a first elastic porous body having a maximum thickness of 4.5 mm, a porosity of 2.5%, and a pore diameter of 200 ⁇ m Porous with a maximum thickness of 0.07mm 4 sides of the laminate consisting of a laminate of a film, a second elastic porous body having a maximum thickness of 4.5 mm, and a first skin material having a maximum thickness of 0.5 ⁇ m are compressed and welded to provide a sealed air resistance.
  • ⁇ Heat resistance evaluation> Using the obtained soundproof cover for an automobile engine, the first elastic porous body was placed on the heat source side, and the heat resistance was evaluated in the same manner as in Example 1. As a result, the temperature of the porous film disposed in the center portion remains at 126 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is a softening point temperature of 140 ° C. or lower of 6-nylon, which is the film substrate. So it was not damaged. ⁇ Soundproof evaluation> The soundproofness of the obtained soundproof cover was evaluated in the same manner as in Example 1. As shown in Table 1 and FIG. 1, the obtained soundproof cover exhibited good sound absorption on both the engine side and the outer surface side during installation.
  • Example 6 In a mold provided with a molding surface corresponding to the target shape to be obtained, (1) Silica cloth (silicas cloth 700 manufactured by Nichias Co., Ltd., fiber diameter 7 ⁇ m, density 1053 kg / m 3 , basis weight 569 g / m 2 , thickness 0.54 mm), (2) glass fiber felt (Firatomica 600-1-KS (glass) manufactured by Nippon Mining Co., Ltd.) as the first elastic porous body forming material Fiber diameter 1.0 ⁇ m, density 19 kg / m 3 , weight per unit area 95 g / m 2 , thickness 5 mm)), and (3) 6-nylon as a porous film forming material Opening part (opening ratio of 2.5%) by passing a film (Ube Film Co., Ltd.
  • Polyester fiber felt (S250-HSGYN, manufactured by Takayasu Co., Ltd.) as a forming material for the second elastic porous body, and a film having a ventilation resistance of 0.11 kPa ⁇ s / m provided with a pore diameter of 200 ⁇ m)
  • the average fiber diameter of the fiber is 10 ⁇ m
  • the density is 25 kg / m 3
  • the weight per unit area is 250 g / m 2
  • the thickness is 10 mm) in this order, and hot pressing is performed at 185 ° C.
  • a first skin material having a maximum thickness of 0.5 mm
  • a first elastic porous body having a maximum thickness of 4.5 mm, a maximum thickness of 0.2% and an opening diameter of 200 ⁇ m.
  • Car engine with a length of 10mm To give the emissions for the soundproof cover.
  • ⁇ Heat resistance evaluation> Using the obtained soundproof cover for an automobile engine, the first elastic porous body was placed on the heat source side, and the heat resistance was evaluated in the same manner as in Example 1. As a result, the temperature of the porous film disposed in the center portion remains at 126 ° C. with respect to the heat source side surface exposure temperature (300 ° C.), and is a softening point temperature of 140 ° C. or lower of 6-nylon, which is the film substrate. So it was not damaged. ⁇ Soundproof evaluation> The soundproof property of the obtained soundproof cover was evaluated in the same manner as in Example 1. As shown in Table 1 and FIG. 1, the obtained soundproof cover exhibited good sound absorption on both the engine side and the outer surface side during installation.
  • the soundproofing covering material according to the present invention has heat resistance and sufficient soundproofing performance even when the thickness is small.
  • polyester fiber felt (125H manufactured by Maeda Kosen Co., Ltd., fiber diameter 10 ⁇ m, density 125 kg / m 3 , weight per unit area 125 g / m 2 , thickness 1 mm)
  • polyester fiber felt (S250-HSGYN manufactured by Takayasu Co., Ltd.), average fiber diameter of polyester fiber 10 ⁇ m as the first elastic porous body forming material , Density 25 kg / m 3 , weight per unit area 250 g / m 2 , thickness 10 mm)
  • 6-nylon film Ube Film Co., Ltd.
  • the opening ratio is 1.19%
  • the opening diameter is 73 ⁇ m
  • the ventilation resistance is 0.45 kPa ⁇ s / m
  • Example 8 Each having an aperture ratio of 2.66%, an aperture diameter of 46 ⁇ m, and a ventilation resistance of 0.17 Pa ⁇ s / m was used.
  • the maximum thickness of 12 is 4 kPa / s / m.
  • the air resistance is 3.8 kPa ⁇ s / m in which the four sides of the elastic porous body and the laminate of the first skin material having the maximum thickness of 1 ⁇ m are compressed and welded.
  • a soundproof cover for a 5 mm automobile engine was obtained.
  • the aperture ratio was 1.19%
  • the aperture diameter was 73 ⁇ m
  • the ventilation resistance was 0.45 kPa ⁇ s / m
  • Example 8 The aperture ratio was 2.66%
  • the aperture diameter was 46 ⁇ m
  • the ventilation resistance was 0.17 Pa ⁇ s / m.
  • the airflow resistance of the automobile engine soundproof cover obtained by the above hot press molding was 1.26 kPa ⁇ s / m in Example 7 and 3.32 kPa ⁇ s / m in Example 8. .
  • the soundproof property of the obtained soundproof cover was evaluated in the same manner as in Example 1. The results are shown in FIGS. 7 and 8, respectively. As shown in FIGS. 7 and 8, the obtained soundproof cover exhibited good sound absorption on either the engine side or the outer surface side during installation.
  • the soundproof covers for automobile engines obtained in Examples 7 to 8 have excellent soundproof performance particularly in a frequency region of 2000 Hz or less.
  • the automobile engine soundproof cover without the porous film obtained in Comparative Example 1 has a sound absorption coefficient peak of about 4000 Hz and a sound absorption coefficient in a frequency band of 2000 Hz or less. Since it is low, it is difficult to exhibit the desired sound absorption characteristics, and the soundproof cover for automobile engines using the porous film having no apertures obtained in Comparative Example 2 has a low sound absorption coefficient in the entire frequency range. I understand that.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un nouveau matériau de protection pour isolation acoustique qui possède une résistance à la chaleur et qui, même s'il est mince, présente une performance d'isolation acoustique suffisante. Le matériau de protection pour isolation acoustique est caractérisé en ce qu'un premier corps élastique poreux, un film poreux présentant un rapport de trous ouverts de 0,1 à 5 % et un diamètre de trou ouvert de 50 à 500 µm, et un second corps élastique poreux sont stratifiés dans cet ordre ; un matériau de surface est de préférence également appliqué sur la surface externe du premier corps élastique poreux et/ou la surface externe du second corps élastique poreux.
PCT/JP2018/006788 2017-02-28 2018-02-23 Matériau de protection pour isolation acoustique et groupe moteur WO2018159504A1 (fr)

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JP2020090909A (ja) * 2018-12-03 2020-06-11 ニチアス株式会社 防音カバーおよびエンジンユニット

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006137160A (ja) * 2004-11-15 2006-06-01 Howa Seni Kogyo Kk 車両用吸音材
JP2009090845A (ja) * 2007-10-10 2009-04-30 Kasai Kogyo Co Ltd 車両用防音材
JP2011064167A (ja) * 2009-09-18 2011-03-31 Nichias Corp 防音カバー及びその製造方法
JP2014031087A (ja) * 2012-08-02 2014-02-20 Toyo Tire & Rubber Co Ltd 空気入りタイヤとリムとの組立体

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Publication number Priority date Publication date Assignee Title
JP2956441B2 (ja) * 1993-09-16 1999-10-04 トヨタ車体株式会社 防音材
JP2005001403A (ja) * 2003-06-09 2005-01-06 Hayashi Gijutsu Kenkyusho:Kk 自動車用フロア敷設材
JP4394638B2 (ja) * 2005-12-15 2010-01-06 株式会社林技術研究所 自動車用成形敷設内装材
JP2010234991A (ja) * 2009-03-31 2010-10-21 Kasai Kogyo Co Ltd 車両用防音材
EP3081435A1 (fr) * 2015-04-15 2016-10-19 Autoneum Management AG Garniture léger de moteur
JP6585383B2 (ja) * 2015-05-27 2019-10-02 株式会社オーツカ 不織布積層体及びこれに使用される孔あきフィルム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006137160A (ja) * 2004-11-15 2006-06-01 Howa Seni Kogyo Kk 車両用吸音材
JP2009090845A (ja) * 2007-10-10 2009-04-30 Kasai Kogyo Co Ltd 車両用防音材
JP2011064167A (ja) * 2009-09-18 2011-03-31 Nichias Corp 防音カバー及びその製造方法
JP2014031087A (ja) * 2012-08-02 2014-02-20 Toyo Tire & Rubber Co Ltd 空気入りタイヤとリムとの組立体

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