JPWO2014141418A1 - Insulated sound absorbing material and heat insulating sound absorbing material molding - Google Patents

Abstract

An object of the present invention is to provide a heat-insulating and sound-absorbing material that is excellent in heat insulating properties and sound-absorbing properties, without increasing the thickness, and thus lightweight. A spread amount of a powdery adhesive having a mass average particle diameter of 80 to 500 μm, comprising a laminate of one or more layers of s / m fiber sheet 3 and one or more layers of breathable porous substrate 2. Alternatively, the heat insulating sound-absorbing material is obtained by providing the adhesive layer 4 with an application amount of 1 to 50 g / m 2 and joining the fiber sheet 3 and the breathable porous substrate 2 to each other with the adhesive layer 4. 1 is set to a range of 0.3 to 6.0 kPa · s / m.

Description

  The present invention relates to a heat insulating sound absorbing material used for, for example, a wall material of a house, a roof material, or an interior material or an exterior material of a vehicle, and a heat insulating sound absorbing material molded product obtained by forming the heat insulating sound absorbing material into a predetermined shape. .

A general heat insulating material has a function of preventing heat transfer from a high temperature to a low temperature or from a low temperature to a high temperature, and in order to perform the function, an air pocket (small room) exists in the material. In general, a porous material having a small thermal conductivity is selected so that heat transfer can be prevented. However, if the thermal conductivity is too small, there is an influence such as dew condensation and the generation of mold accompanying it. Therefore, as the porous material, a material such as a fiber-based material, a breathable plastic foam, or glass wool is used. Yes. From the viewpoint of the heat insulating effect, the heat insulating material is more effective as the thickness is larger.
In recent years, especially in the vehicle industry and the home building industry, considering the aspects of improving fuel efficiency, energy saving, quietness, environment, etc., it is a low-density and light-weight heat insulating material, but also has sound absorption. There is a need for a heat-absorbing sound-absorbing material. As a heat insulating sound-absorbing material satisfying such requirements, for example, a fiber sheet made of organic fiber or inorganic fiber, paper, foam, or a laminate formed by combining these materials is known. In addition, in order for the heat insulating sound absorbing material made of the laminate to exhibit excellent sound absorbing properties, it is necessary to provide appropriate air permeability. For that purpose, depending on the frequency of the sound to be absorbed, the fiber sheet or paper It is known that the density and thickness of the foam should be adjusted.

Conventionally, the thing of patent documents 1-3 is provided as a heat insulation sound-absorbing material which comprised the performance of both heat insulation and sound absorption.
Patent Document 1 provides a heat insulating sound-absorbing material that is a molded sheet using natural fibers and thermoplastic fibers as fiber materials and to which thermally foamable microcapsules are added, and is a molded article having good uniform expansion. However, since the thermally foamable microcapsules are used as the foam, it is difficult to control the air permeability necessary for sound absorption.
Patent Document 2 is a heat insulating sound absorbing plate made of a fiber material containing paper pulp and provided with a space between the fibers, and provides a heat insulating sound absorbing plate formed with a high surface density. It was difficult to adjust the air permeability by the high-density layer.
Patent Document 3 provides a heat insulating material excellent in heat insulating property and sound absorbing property in which a high density nonwoven fabric is laminated on a surface portion or an inner layer of a fiber assembly composed of two or more kinds of fibers. Due to the nonwoven fabric, the sound absorption performance is limited to a specific frequency.

JP 2012-136808 A JP 2002-339213 A JP 2002-339217 A

However, the above conventional heat insulating sound absorbing material requires that the molded product has an appropriate air permeability in order to exhibit sound absorbing properties, but the improvement of the heat insulating property uses a material with low thermal conductivity. Since a static air layer is present in the molded product, if the heat insulation is improved, the air flow is retained, and the sound absorption performance is not improved. .
Therefore, the conventional heat insulating sound absorbing material has increased the thickness and weight of the heat insulating sound absorbing material in order to solve the trade-off problem. However, the increase in the thickness and weight reduces the weight of the heat insulating sound absorbing material and saves space. In particular, when the heat-absorbing and sound-absorbing material is used as an automobile interior material, it adversely affects fuel consumption and installation space. Therefore, there is a demand for a heat insulating sound absorbing material made of a material having a low thermal conductivity, lightweight and excellent in moldability, and having an air layer in the molded product, but capable of controlling air permeability appropriately.

As a means for solving the problems of the conventional heat insulating sound absorbing material or heat insulating sound absorbing molded article, the present invention comprises one or more fiber sheets having a ventilation resistance of 0.1 to 5.0 kPa · s / m. , Comprising a laminate of one or two or more breathable porous substrates, and using the powdered adhesive having a mass average particle diameter of 80 to 500 μm, the fiber sheet and the breathable porous substrate. Adiabatic sound-absorbing sound that is adhered to each other and the overall airflow resistance is set in the range of 0.3 to 6.0 kPa · s / m with the application amount or application amount of the powdery adhesive set to 1 to 50 g / m ² Providing materials.
The powdery adhesive is preferably a hot melt adhesive powder.
The fiber sheet is preferably a fiber sheet having a thickness of 0.05 to 0.3 mm and a mass per unit area of 10 to 50 g / m ² and containing at least 60% by mass or more of pulp fibers.
The porous substrate is preferably a sheet of inorganic fibers to which a synthetic resin is added to give formability.
And the heat insulation sound-absorbing-material molded object shape | molds the said heat insulation sound-absorbing material in a predetermined shape.

[Action]
In the present invention, a fiber sheet having a ventilation resistance in the range of 0.1 to 5.0 kPa · s / m is used. The fiber sheet functions as a ventilation resistance adjusting layer for imparting a desired sound absorbing performance to the heat insulating sound absorbing material by adjusting the air resistance of the heat insulating sound absorbing material of the present invention without increasing the thickness. When one layer or two or more layers of the fiber sheet and one layer or two or more layers of the air-permeable porous substrate are bonded to each other and laminated, a powdery adhesive having a mass average particle diameter of 80 to 500 μm is used, If an adhesive layer obtained by applying 1-50 g / m ² of the powdered adhesive is applied, the fiber layer or the heat-absorbing sound absorbing The air permeability of the heat insulating sound-absorbing material is set to a range of 0.3 to 6.0 kPa · s / m, which is desirable for the heat-absorbing sound-absorbing property, by the fiber sheet as the air-flow resistance adjusting layer without impeding the air-permeable property of the material. I can do it.
In general, hot-melt adhesive powder is advantageously used as such a powdery adhesive.
In order to set the ventilation resistance of the fiber sheet in the range of 0.1 to 5.0 kPa · s / m, the fiber sheet has a thickness of 0.05 to 0.3 mm and a mass per unit area of 10 to 10. 50 g / m ² is preferable. Moreover, when 60 mass% or more of pulp fibers with good heat insulation are mixed, the heat insulation of the fiber sheet is improved.
Further, when an inorganic fiber sheet imparted with formability by adding synthetic fibers is used as the porous substrate, a heat-resistant sound absorbing material having high flame retardancy or non-flammability can be obtained.
The heat insulating sound-absorbing material is formed into a two-layer shape at an application site of an automobile or a building and used as a heat insulating sound-absorbing material molding.

〔effect〕
The present invention provides a heat-insulating and sound-absorbing material that is excellent in heat insulating properties and sound-absorbing properties and does not increase in thickness, and thus is lightweight.

Airflow resistance measurement explanatory drawing. The sectional side view of one Example of the heat insulation sound-absorbing material of this invention. Side sectional drawing of the other Example of the heat insulation sound-absorbing material of this invention. Side sectional drawing of the further another Example of the heat insulation sound-absorbing material of this invention. The sectional side view explaining the test box of heat insulation performance.

An embodiment embodying the present invention will be described in detail.
[Fiber sheet]
The fiber sheet used for the heat insulating sound-absorbing material of the present invention will be described.
Examples of fibers used for the fiber sheet material include pulp fibers, biodegradable fibers (polylactic acid fibers) made of starch extracted from plants such as corn and sugarcane, cotton, palm fibers, hemp fibers, bamboo fibers, kenaf Natural fiber such as fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, acrylic fiber, urethane fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, acetate fiber, polymetaphenylene isophthalamide fiber and poly-p-phenylene Aramid fiber such as terephthalamide fiber, polyarylate fiber, polyether ether ketone fiber, synthetic fiber such as polyphenylene sulfide fiber, inorganic fiber such as glass fiber, carbon fiber, ceramic fiber, asbestos fiber, or these fibers were used. Fiber Such regenerated fibers obtained by fibrillating product scrap and the like. These fibers may be used alone or in combination of two or more. Further, these fibers may be entangled by performing a needle punching treatment if desired.
As the fiber used for the material of the fiber sheet, a low melting thermoplastic fiber having a melting point of 180 ° C. or lower may be used together with the fiber or instead of the fiber. Examples of the low melting point thermoplastic fiber include polyolefin fibers such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, etc. having a melting point of 180 ° C. or less, polyvinyl chloride fibers, polyurethane fibers, polyester fibers. Polyester copolymer fibers, polyamide fibers, polyamide copolymer fibers, and the like. These low melting point thermoplastic fibers are used alone or in combination of two or more. The fineness of the low melting point thermoplastic fiber is preferably in the range of 0.1 to 60 dtex. As a desirable low melting point thermoplastic fiber used in the present invention, for example, a core having the above-mentioned normal fiber as a core part and a low melting point thermoplastic resin having a melting point of 100 to 180 ° C. which is a material resin of the low melting point thermoplastic fiber as a sheath. There is a sheath type composite fiber.
What is desirable as the fiber used for the material of the fiber sheet is pulp fiber. As the pulp fiber, usually, any of mechanical pulp, chemical pulp, and semi-chemical pulp made from softwood or hardwood chips can be used. By containing 60% by mass or more of the pulp fiber in the fiber sheet, good heat insulating properties can be imparted to the fiber sheet. When the content of pulp fibers is less than 60% by mass, the effect of imparting heat insulation by the pulp fibers becomes difficult to appear.
The fiber sheet may be provided as a nonwoven fabric by, for example, needle punching, fusion bonding, or the like, but may be provided as a paper sheet by preparing a slurry and making paper. Moreover, you may provide as a knitted fabric.

The fiber sheet has a ventilation resistance set in a range of 0.1 to 5.0 kPa · s / m in order to ensure good sound absorption.
Here, the ventilation resistance (Pa · s / m) is a scale representing the degree of ventilation of the breathable material. This ventilation resistance is measured by a steady flow differential pressure measurement method. As shown in FIG. 1, a test piece T is arranged in a cylindrical air passage W, and the pressure in the air passage W on the start point side of the arrow in the figure in a state of a constant air flow V (the direction of the arrow in the figure). By measuring the pressure difference between P1 and the end point P2 of the arrow in the figure, the ventilation resistance R can be obtained from the following equation.
R = ΔP / V
Where ΔP (= P1−P2): pressure difference (Pa), V: air flow per unit area (m ³ /
m ² · s).
The ventilation resistance can be preliminarily measured by, for example, an air permeability tester (product name: KES-F8-AP1, manufactured by Kato Tech Co., Ltd., steady flow differential pressure measurement method).
In order to adjust the ventilation resistance of the fiber sheet, a means for adjusting the density of the fiber sheet is generally used.

The fiber sheet may be coated or impregnated with an appropriate amount of the following synthetic resin for adjusting the airflow resistance. Examples of the synthetic resin include thermoplastic resins and / or thermosetting resins.
Examples of the thermoplastic resin include acrylic ester resin, methacrylic ester resin, ionomer resin, ethylene-ethyl acrylate (EEA) resin, acrylonitrile / styrene / acrylic rubber copolymer (ASA) resin, and acrylonitrile / styrene copolymer ( AS) resin, acrylonitrile / chlorinated polyethylene / styrene copolymer (ACS) resin, ethylene side acid vinyl copolymer (EVA) resin, ethylene vinyl alcohol copolymer (EVOH) resin, methacrylic resin (PMMA), polybutadiene (BDR), Polystyrene (PS), polyethylene (PE), acrylonitrile-butadiene-styrene copolymer (ABS) resin, chlorinated polyethylene (CPE), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polypropylene ( PP), cellulose acetate (CA) resin, syndiotactic polystyrene (SPS), polyoxymethylene (= polyacetal) (POM), polyamide (PA), polyimide (PI), polyamideimide (PAI), poly Etherimide (PEI), polyarylate (PAR), thermoplastic polyurethane (TPU) elastomer, thermoplastic elastomer (TPE), liquid crystal polymer (LCP), polyetheretherketone (PEEK), polysulfone (PSF), polyethersulfone (PES), fluororesin, polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polycarbonate (PC), polyphenylene ether (PPE), modified PPE, polyphenylene sulfide (PPS) , Polybutylene terephthalate (PBT), polybenzimidazole (PBI), wholly aromatic polyester (POB), and the like. Two or more types of the above thermoplastic resins may be mixed and used, or one or two or more types of thermosetting resins may be mixed and used to such an extent that the thermoplastic resin of the thermoplastic sheet is not impaired.
Examples of the thermosetting resin include urethane resin, melamine resin, thermosetting acrylic resin, particularly thermosetting acrylic resin that cures by forming an ester bond by heating, urea resin, phenol resin, epoxy resin, thermosetting type Polyester or the like is used, but urethane resin prepolymer, urea resin prepolymer (initial condensate), phenol resin prepolymer (initial condensate), diallyl phthalate prepolymer, acrylic oligomer, polyisocyanate that produce the synthetic resin. Synthetic resin precursors such as prepolymers such as narate, methacrylic ester monomers and diallyl phthalate monomers, oligomers and monomers may be used. The thermosetting resin is preferably used in the form of an aqueous solution, an aqueous emulsion, or an aqueous dispersion because it is easy to handle, but may be used in the form of an organic solvent solution. Two or more of the above thermosetting resins or synthetic resin precursors may be used in combination.
Further, a phenolic resin is particularly desirable as the resin used in the present invention. The phenolic resin is obtained by condensing a phenolic compound with formaldehyde and / or a formaldehyde donor.
The phenolic compound used in the phenolic resin may be a monohydric phenol, a polyhydric phenol, or a mixture of a monohydric phenol and a polyhydric phenol. When only monohydric phenol is used, formaldehyde is easily released during and after curing. Therefore, polyhydric phenol or a mixture of monohydric phenol and polyhydric phenol is preferably used.

The fiber sheet may be added, coated, impregnated, or mixed with the following third component as desired.
As the third component, for example, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, alumina , Silica, colloidal silica, mica, diatomite, dolomite, gypsum, talc, clay, asbestos, mica, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, glass powder, stone powder, blast furnace slag, fly ash , Cement, zirconia powder and other inorganic fillers; natural rubber or derivatives thereof; styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, isoprene rubber, isoprene-iso Synthetic rubber such as tylene rubber; water-soluble polymers such as polyvinyl alcohol, sodium alginate, starch, starch derivatives, glue, gelatin, blood powder, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyacrylate, polyacrylamide, and natural gums; wood Organic fillers such as flour, walnut powder, coconut powder, wheat flour and rice flour; higher fatty acids such as stearic acid and palmitic acid; higher alcohols such as palmityl alcohol and stearyl alcohol; fatty acids such as butyryl stearate and glycerol monostearate Esters; fatty acid amides; natural waxes such as carnauba wax; synthetic waxes; mold release agents such as paraffins, paraffin oil, silicone oil, silicone resin, fluororesin, polyvinyl alcohol, and grease; azo Organic foaming agents such as carbonamide, dinitrosopentamethylenetetramine, P, P′-oxybis (benzenesulfonylhydrazide), azobis-2,2 ′-(2-methylgropionitrile); sodium bicarbonate, potassium bicarbonate, heavy Inorganic foaming agents such as ammonium carbonate; hollow particles such as shirasu balloon, perlite, glass balloon, foamed glass, hollow ceramics; plastic foams and foamed particles such as foamed polyethylene, foamed polystyrene, foamed polypropylene; pigments, dyes, antioxidants Agents, antistatic agents, crystallization accelerators, phosphorus compounds, nitrogen compounds, sulfur compounds, boron compounds, bromine compounds, guanidine compounds, phosphate compounds, phosphate ester compounds, amino resins, etc. Flame retardant, flame retardant, flame retardant, water repellent, oil repellent, insect repellent, antiseptic, wack S, surfactants, lubricants, antioxidants, ultraviolet absorbers, DBP, DOP, a plasticizer such as phthalic acid ester plasticizers and other tricresyl phosphate such as dicyclohexyl phthalate. Examples of the water / oil repellent include natural wax, synthetic wax, fluororesin, and silicon resin.

(Breathable porous substrate)
The breathable porous substrate used for the heat insulating sound absorbing material of the present invention will be described.
Examples of the material used for the breathable porous substrate include one or more of inorganic fibers, synthetic fibers, natural fibers, recycled fibers, low melting point thermoplastic fibers, and the like mentioned in the fiber sheet. Ventilation of fiber base materials made of fibers, or breathable polyurethane foam, breathable polyethylene foam, breathable polypropylene foam, breathable polystyrene foam, breathable phenolic resin foam, breathable melamine resin foam, etc. A porous plastic foam or a sintered body of the breathable plastic foam is used. The porous substrate may be coated or impregnated with a synthetic resin such as a thermoplastic resin or a thermosetting resin mentioned in the fiber sheet.
Among the materials listed above, those that are desirable as the material for the breathable porous material of the present invention are inorganic fibers because they have flame retardancy or incombustibility, and among them, glass fibers, ceramic fibers, and asbestos fibers are available. Is desirable because it is easy and has excellent heat insulation. The inorganic fibers may be entangled to form a breathable porous substrate, or may be bound with a synthetic resin to form a breathable porous substrate.
It said breathable porous substrate, typically a thickness of 5 to 50 mm, density is used. For ^{4kg / m 3 ~150kg / m 3} .

[Adhesive layer]
The adhesive layer used for the heat insulating sound absorbing material of the present invention will be described.
It is important that the adhesive layer has air permeability in order to ensure the sound absorbing property of the heat insulating sound absorbing material of the present invention. Examples of the adhesive used for the air-permeable adhesive layer include a powder adhesive, a spider web adhesive, and a porous sheet adhesive. Among these adhesives, a powdery adhesive is desirable in terms of easy adjustment of air permeability. In this embodiment, a hot-melt type powdered adhesive made of a polyamide resin or a polyester resin having a softening point of 110 to 160 ° C. Is used.
The powdery adhesive preferably has a mass average particle diameter of 80 to 500 μm, and the application amount or application amount is preferably 1 to 50 g / m ² . When the mass average particle diameter is less than 80 μm, or when the spraying amount or the coating amount is less than 1 g / m ² , there is a possibility that sufficient adhesive force for joining the fiber sheet and the breathable porous substrate cannot be obtained. There is sex. When the mass average particle diameter exceeds 500 μm, or when the application amount or application amount exceeds 50 g / m ² , the air permeability is impaired by filling the pores of the fiber sheet or the air-permeable porous substrate with the adhesive. There is a possibility that the sound absorbing performance required for the heat insulating sound absorbing material cannot be sufficiently exhibited.
The powdery adhesive is sprayed on the adhesive surface of the fiber sheet and / or the breathable porous substrate with a known spraying device such as a sieve or a spray roll, or the powdered adhesive is used. A dispersion liquid dispersed in water or a solvent is applied to the adhesive surface by a coating machine such as a roll coater or a knife coater.

[Insulated sound absorbing material]
The heat insulating sound-absorbing material of the present invention is composed of a laminate of one or more layers of the fiber sheet and one or more layers of the breathable porous substrate, and the fiber sheet and the breathable material. The porous porous substrate is bonded to each other through the adhesive layer. The heat insulating sound-absorbing material exhibits heat insulating performance by forming a static air layer with the breathable porous substrate, and adjusts air permeability with the fiber sheet, while suitably maintaining the heat insulating performance. It is configured so that it can exhibit excellent sound absorption performance. Further, the adhesive layer has a structure that does not hinder the air permeability between the fiber sheet and the air-permeable porous base material, so that the heat-insulating sound-absorbing material has the same heat-insulating performance and sound-absorbing performance. It functions so that it can be demonstrated.
The heat insulation sound absorbing material is set to a range of 0.3 to 6.0 kPa · s / m in overall ventilation resistance of the heat insulating sound absorbing material from the viewpoint of making both heat insulation performance and sound absorption performance suitable. The If the overall ventilation resistance of the heat insulating sound-absorbing material is less than 0.3 kPa · s / m, a still air layer cannot be maintained and good heat insulating performance cannot be obtained, and it is suitable at a predetermined frequency (4000 Hz or more). Sound absorption performance cannot be obtained. If the overall ventilation resistance of the heat insulating sound absorbing material exceeds 6.0 kPa · s / m, the heat absorbing performance can be obtained, but the sound absorbing performance cannot be obtained at a predetermined frequency (1000 Hz or more).
The structural example of the said heat insulation sound-absorbing material is shown below.
The heat insulating sound-absorbing material 1 having the configuration shown in FIG. 2 is provided with an adhesive layer 4 on one side (upper surface) of a single layer of breathable porous substrate 2, and one layer of the fiber sheet 3 passes through the adhesive layer 4. The porous porous substrate 2 is laminated on one side.
The heat insulating sound-absorbing material 1A having the structure shown in FIG. 3 is provided with adhesive layers 4 and 4 on both surfaces (upper surface and lower surface) of a single breathable porous base material 2 and two layers are interposed through the adhesive layers 4 and 4. Fiber sheets 3 and 3 are laminated on both sides of the breathable porous substrate 2.
4 is provided with adhesive layers 4 and 4 on both surfaces (upper surface and lower surface) of a single fiber sheet 3, and two layers of air-permeable porous materials are interposed through the adhesive layers 4 and 4. The base materials 2 and 2 are laminated on both surfaces of the fiber sheet 3.

[Molding]
When the heat insulating sound absorbing material 1, 1A, 1B is used for automobile interior materials, building wall materials, ceiling materials, etc., the heat insulating sound absorbing material 1, 1A, 1B is usually along the base surface to which the heat insulating sound absorbing material 1, 1A, 1B is applied. Molded into a shape. A general molding method of the heat insulating sound-absorbing materials 1, 1A, 1B is hot press molding. In the hot press molding, the molding temperature at the time of the hot press is about 150 ° C to 230 ° C.
When the synthetic resin is applied to or impregnated into the fiber sheet 3 or the porous substrate 2, the molding temperature at the time of hot pressing is a softening temperature or more if it is a thermoplastic resin, and a curing temperature if it is a thermosetting resin. The above temperatures are applied.

［通気性多孔質基材］
通気性多孔質基材２には、グラスフィラメントをフェノール樹脂で結着して得られたグラスウールを使用した。該グラスウールは、厚さが１０ｍｍ、密度が５０ｋｇ／ｍ^３であった。
［接着剤層］
接着剤層４に使用する接着剤には、ポリアミド樹脂からなるホットメルト型の粉末状接着剤を使用した。該粉末状接着剤は、質量平均粒子径が１００〜１５０μｍ、軟化点が１４０℃であった。
［断熱吸音材］
上記繊維シート３の片面に篩を使用して上記粉末状接着剤を、塗布量が５ｇ／ｍ^２となるように散布し、接着剤層４を形成した。該接着剤層４の表面上に上記通気性多孔質基材２を積層した後、型面温度を１８０〜２００℃とした加熱プレス機で使用して、繊維シート３と通気性多孔質基材２とを軽く圧着することで、通気性多孔質基材２の片面に繊維シート３を積層した構成の断熱吸音材のテストピースＡ〜Ｄを作成した。
さらに同様にして、通気性多孔質基材２の両面に繊維シート３を積層した構成の断熱吸音材のテストピースＥ〜Ｈを作成した。
上記断熱吸音材のテストピースＡ〜Ｄ及びＥ〜Ｈの通気抵抗を表３に示す。
なお、以下において通気抵抗は、フラジール型通気度試験器に準じ、通気性試験機（カトーテック社製 ＫＥＳ−Ｆ８−ＡＰ１）を用い、単位面積当たりの通気量を４ｃｃ／ｓ・ｃｍ^２として測定したものとする。[Example 1]
[Fiber sheet]
For the fiber sheet 3, paper sheets 1 to 4 having different masses per unit area were used by making a pulp fiber slurry with a normal paper machine. Table 1 shows various performances of the sheets 1 to 4 (however, “mass per unit area” is described as “weight per unit area” in the table).

[Breathable porous substrate]
As the breathable porous substrate 2, glass wool obtained by binding glass filaments with a phenol resin was used. The glass wool had a thickness of 10 mm and a density of 50 kg / m ³ .
[Adhesive layer]
As the adhesive used for the adhesive layer 4, a hot melt type powder adhesive made of polyamide resin was used. The powdery adhesive had a mass average particle diameter of 100 to 150 μm and a softening point of 140 ° C.
[Thermal insulation material]
Using a sieve on one side of the fiber sheet 3, the powder adhesive was sprayed so that the coating amount was 5 g / m ² to form an adhesive layer 4. After laminating the breathable porous substrate 2 on the surface of the adhesive layer 4, the fiber sheet 3 and the breathable porous substrate are used by using a hot press machine with a mold surface temperature of 180 to 200 ° C. The test pieces A to D of the heat insulating sound absorbing material having a configuration in which the fiber sheet 3 is laminated on one side of the breathable porous base material 2 were created.
Further, in the same manner, test pieces E to H of a heat insulating sound absorbing material having a configuration in which the fiber sheet 3 was laminated on both surfaces of the breathable porous substrate 2 were prepared.
Table 3 shows the airflow resistance of the test pieces A to D and E to H of the heat insulating sound absorbing material.
In the following, the airflow resistance is measured according to the Frazier type air permeability tester, using an air permeability tester (KES-F8-AP1 manufactured by Kato Tech Co., Ltd.) and the airflow per unit area is 4 cc / s · cm ^2. Shall be.

〔比較例２〕
グラスウールをフェノール樹脂で結着して得られた不織布を使用し、それぞれ表３に示す密度とした通気性多孔質基材２のみを単独で使用して断熱吸音材のテストピースＭ〜Ｏを作成した。
上記断熱吸音材のテストピースＭ〜Ｏの通気抵抗を表３に示す。[Comparative Example 1]
Test pieces I to L of heat insulating sound-absorbing material were prepared in the same manner as in Example 1 except that the paper sheets 5 and 6 whose performances are shown in Table 2 were used as the fiber sheets.
Table 3 shows ventilation resistance of the test pieces I to L of the heat insulating sound absorbing material.

[Comparative Example 2]
Using non-woven fabric obtained by binding glass wool with phenolic resin, using only the breathable porous base material 2 having the densities shown in Table 3 alone, the test pieces M to O of heat insulating sound absorbing materials are created. did.
Table 3 shows the airflow resistance of the test pieces M to O of the heat insulating sound absorbing material.

[Insulation performance test]
About the test pieces AO of the said heat insulation sound-absorbing material, the heat insulation performance test was done using the test box.
As shown in FIG. 5, the test box 10 includes two chambers: a heating chamber 11 having a size of W300 × H300 × D300 (mm) and a bass chamber 12 having a size of W300 × H400 × D300 (mm). . An upper lid 13 is detachably provided at the upper part of the low temperature chamber 12, an outside air inlet 14 having a diameter of 5 mm is provided in the heating chamber 11, and a heat insulating material 15 having a thickness of 50 mm is provided on the outer periphery of the test box 10. Is provided. In the test box 10, a test piece mounting frame 16 having a thickness of 15 mm is provided at the center which is the boundary between the heating chamber 11 and the bass chamber 12. A test piece TP measuring 100 × 100 × 10 mm in thickness is attached to the test piece mounting frame 16 so that air does not leak from the periphery of the test piece TP.
In the heat insulation performance test, the test piece TP is attached to the test piece mounting frame 16 and the heater H in the heating chamber 11 is operated. After the temperature in the heating chamber 11 reaches 80 ° C., the test piece TP is installed in the bass chamber 12. When the suction device 17 is activated, the temperature in the bass chamber 12 is measured every predetermined time (minutes) using the fact that the heated air in the heating chamber 11 is transmitted to the bass chamber 12 via the test piece TP. Is measured and the increase in temperature is observed. Fans 18 are provided in the heating chamber 11 and the bass chamber 12, respectively. During the test, the fans 18 are operated to maintain the temperature balance in each chamber.
The room temperature of the installation environment of the test box 10 is set to 20 ± 1 ° C., and the temperature in the heating chamber 11 is confirmed with the thermometer TM1 and kept at 80 ± 1 ° C. during the heat insulation performance test. The temperature in the bass chamber 12 was measured with a thermometer TM2.
Table 4 shows the results of the heat insulation performance test.

From Table 4, in Example 1, the test pieces A to D obtained by laminating the fiber sheet on one side of the breathable porous base material have a smaller temperature rise as the ventilation resistance increases, and the temperature of the low temperature chamber after 10 minutes. Was about 39 ° C to 43.5 ° C. Test pieces E to H in which fiber sheets are laminated on both sides of a breathable porous base material have slightly improved heat insulation properties compared to test pieces A to D, but the temperature of the low temperature chamber after 10 minutes is 38 ° C. to 43 ° C. The temperature was about 5 ° C., almost the same as the test pieces A to D.
In Comparative Example 1, the test piece I in which the fiber sheet is laminated on one side of the breathable porous substrate has a small ventilation resistance of 0.02 kPa · s / m (less than 0.1 kPa · s / m). The ventilation resistance of the whole heat-insulating sound-absorbing material is also as small as 0.23 kPa · s / m (less than 0.3 kPa · s / m), the static air layer cannot be maintained, the temperature rises quickly, and the temperature of the cold room after 10 minutes Rose to 46.5 ° C. On the other hand, the test piece J has a large ventilation resistance of 6.2 kPa · s / m (over 5.0 kPa · s / m), and the ventilation resistance of the entire heat insulating sound absorbing material is 6.4 kPa · s / m. It was large (over 6.0 kPa · s / m), a still air layer could be maintained, the temperature rise was small, and the temperature of the low temperature chamber after 10 minutes was 37.5 ° C. The test piece K in which the fiber sheet is laminated on both sides of the breathable porous substrate is the same as the test piece I at the temperature of the low temperature chamber of 46.5 ° C. after 10 minutes, and the test piece L is 10 minutes later. The temperature of the low greenhouse was 37.0 ° C., which was the same as that of test piece J.
From the test results of Example 1 and Comparative Example 1, it was found that the temperature rise in the low temperature room, that is, the heat insulation performance, can be adjusted by the ventilation resistance of the fiber sheet.
In Comparative Example 2, the test piece M relates to a conventional heat insulating sound-absorbing material not provided with a fiber sheet, and has a small ventilation resistance of 0.23 kPa · s / m (less than 0.3 kPa · s / m) and is stationary. The air layer could not be maintained and the temperature rose rapidly, and the temperature in the low temperature chamber after 10 minutes had risen to 47.5 ° C. As compared with Example 1 in which the density of the breathable porous substrate was also 50 kg / m ² , the temperature rise was clearly large.
The test piece N has a ventilation resistance of 1.03 kPa · s / m, substantially the same ventilation resistance as the test piece B of Example 1, and the temperature of the low temperature chamber after 10 minutes is also substantially the same as 43.5 ° C. is there.
The test piece O has a ventilation resistance of 2.67 kPa · s / m, which is similar to the test piece D of Example 1, and the temperature of the low temperature chamber after 10 minutes is substantially the same as 39.0 ° C. is there.
Therefore, although the heat insulation performance can be made substantially the same by increasing the density and making the ventilation resistance substantially the same as in Comparative Example 2, use a fiber sheet with an appropriate ventilation resistance as in Example 1. Thus, it was shown that a low density, that is, light weight, can exhibit the same degree of heat insulation performance.

[Sound absorption performance test]
With respect to the test pieces A to H of Example 1 and the test pieces I to O of Comparative Examples 1 and 2, the normal incident sound absorption coefficient (%) having a thickness of 10 mm was measured according to JIS-A1405. The results are shown in Table 5.
In addition, the test piece in which the fiber sheet was laminated only on one side of the breathable porous base material was arranged so that the fiber sheet faced the sound source side.

From Table 5, although test piece AD which laminated | stacked the fiber sheet in Example 1 on the single side | surface of the air permeable porous base material has some differences with the air flow rate of a fiber sheet, the whole ventilation resistance of a heat insulation sound-absorbing material. Is in the range of 0.3 to 6.0 kpa · s / m, and the sound absorption rate (%) is approximately 70% or higher at approximately 2000 Hz or higher, and the sound absorption performance is good. Further, the test pieces E to H in which the fiber sheets are laminated on both sides of the breathable porous base material have a larger ventilation resistance than the test pieces A to D, but the ventilation resistance is still 0.3 to 6.0 kpa · s. The sound absorption performance is almost the same as that of the test cases A to D, and no extreme difference is observed.
In Comparative Example 1, the test piece I in which the fiber sheet is laminated on one side of the breathable porous base material has a small ventilation resistance of 0.24 kpa · s / m as a whole (0.3 kpa · s / m). Less), and the sound absorption coefficient is as bad as 58% at 4000 Hz. In addition, the test piece J has a large ventilation resistance of 6.40 kpa · s / m (over 6.0 kpa · s / m), and the sound absorption coefficient is as high as 64% at 800 Hz, but 1000 Hz or more. It gets worse. The test piece K in which the fiber sheet is laminated on both surfaces of the breathable porous substrate shows the same tendency as the test piece I, and the test piece L shows the same tendency as the test piece J. Therefore, it can be seen that the test pieces J and L have good heat insulation performance, but have a low sound absorption rate, and do not have both heat insulation performance and sound absorption performance.
In Comparative Example 2, the test piece M, like J, has a low ventilation coefficient of 0.23 kpa · s / m (less than 0.3 kpa · s / m) and a poor sound absorption coefficient, as in the case of J. The test piece N has a ventilation resistance of 1.03 kpa · s / m as a sound absorbing material, which is almost the same as the test piece B of Example 1, and the sound absorbing performance is almost the same, but the density is large and the weight is large. It can be seen that the test piece O has a ventilation resistance of 2.67 kpa · s / m, which is almost the same as the test piece D of Example 1 and substantially the same sound absorption performance, but the density is tripled and becomes very heavy. .
That is, it was found that the test pieces A to H of Example 1 satisfy both the heat insulation performance and the sound absorption performance and are lightweight.

[Example 2]
Pulp fiber: Polyester fiber, 95: 5, a mixed fiber sheet having a mass per unit area of 22 g / m ² , a thickness of 0.12 mm, and a ventilation resistance of 0.98 kPa · s / m is used as a fiber layer. On one side, as a reinforcing layer, a non-woven fabric by a spunbond method having a mass per unit area of 15 g / m ² is used, and a hot-melt type powder adhesive made of polyester (particle size: 100 to 150 μm, melting point: 110 ° C.) is used. A fiber sheet in which a reinforcing layer is laminated on the fiber layer was prepared by laminating and bonding via an adhesive layer formed so as to be applied in an amount of 5 g / m ² .
The obtained fiber sheet was laminated on both surfaces of a breathable porous substrate having a density of 50 kg / m ³ and a thickness of 20 mm made of glass wool, with the fiber layer side of the fiber sheet contacting the breathable porous substrate. In the same manner, using the above hot melt type powder adhesive, spray coating adhesion lamination was similarly performed so that the coating amount was 5 g / m ^2, and a heat insulating sound absorbing material having a ventilation resistance of 1.50 kPa · s / m was obtained. Obtained. This material is lightweight, has excellent heat insulation properties, and good sound absorption properties, and is useful as a heat insulation sound absorbing material for houses.

Example 3
Hot melt adhesive powder made of polyamide (particle size: 150 to 200 μm, melting point: 130 ° C.) is applied at a coating amount of 2 g / m ² on the surface of the fiber sheet side of the fiber sheet obtained in Example 2, 140 to Heating was performed in a heating furnace at 150 ° C., and the hot melt adhesive powder was fused to the fiber sheet to form an adhesive layer.
Next, an initial condensate (20% aqueous solution) of phenol-alkylresorcin-formaldehyde as a synthetic resin is impregnated so as to have a coating amount of 15% by mass with respect to the reinforcing fiber sheet, and then heated and dried at 100 to 120 ° C. By pre-curing the synthetic resin, a reinforcing fiber sheet coated with the B-state synthetic resin was obtained. Further, the obtained reinforcing fiber sheet is made of a polyester fiber mixed with 20% by mass of a low melting point polyester fiber, and laminated on one side of a breathable porous substrate having a thickness of 40 mm and a density of 25 kg / m ³ , The molded product was molded into a predetermined shape with a heat compression molding machine whose mold temperature was adjusted to 200 ° C. to obtain a heat-insulated sound-absorbing material molded product.
The obtained heat-insulating sound-absorbing material molded product has a difference depending on the molding part, but has an average density of 30 kg / m ³ and a ventilation resistance of 1.02 to 1.8 kPa · s / m. As an interior / exterior part of an automobile, it has excellent heat insulation and sound absorption.

  The heat insulating sound-absorbing material of the present invention is excellent in heat insulating properties and sound absorbing properties, and does not increase in thickness, and is therefore lightweight, and thus can be used industrially.

DESCRIPTION OF SYMBOLS 1 Heat insulation sound-absorbing material 2 Breathable porous base material 3 Fiber sheet 4 Adhesive layer

  The present invention relates to a heat insulating sound absorbing material used for, for example, a wall material of a house, a roof material, or an interior material or an exterior material of a vehicle, and a heat insulating sound absorbing material molded product obtained by forming the heat insulating sound absorbing material into a predetermined shape. .

A general heat insulating material has a function of preventing heat transfer from a high temperature to a low temperature or from a low temperature to a high temperature, and in order to perform the function, an air pocket (small room) exists in the material. In general, a porous material having a small thermal conductivity is selected so that heat transfer can be prevented. However, if the thermal conductivity is too small, there is an influence such as dew condensation and the generation of mold accompanying it. Therefore, as the porous material, a material such as a fiber-based material, a breathable plastic foam, or glass wool is used. Yes. From the viewpoint of the heat insulating effect, the heat insulating material is more effective as the thickness is larger.
In recent years, especially in the vehicle industry and the home building industry, considering the aspects of improving fuel efficiency, energy saving, quietness, environment, etc., it is a low-density and light-weight heat insulating material, but also has sound absorption. There is a need for a heat-absorbing sound-absorbing material. As a heat insulating sound-absorbing material satisfying such requirements, for example, a fiber sheet made of organic fiber or inorganic fiber, paper, foam, or a laminate formed by combining these materials is known. In addition, in order for the heat insulating sound absorbing material made of the laminate to exhibit excellent sound absorbing properties, it is necessary to provide appropriate air permeability. For that purpose, depending on the frequency of the sound to be absorbed, the fiber sheet or paper It is known that the density and thickness of the foam should be adjusted.

Conventionally, the thing of patent documents 1-3 is provided as a heat insulation sound-absorbing material which comprised the performance of both heat insulation and sound absorption.
Patent Document 1 provides a heat insulating sound-absorbing material that is a molded sheet using natural fibers and thermoplastic fibers as fiber materials and to which thermally foamable microcapsules are added, and is a molded article having good uniform expansion. However, since the thermally foamable microcapsules are used as the foam, it is difficult to control the air permeability necessary for sound absorption.
Patent Document 2 is a heat insulating sound absorbing plate made of a fiber material containing paper pulp and provided with a space between the fibers, and provides a heat insulating sound absorbing plate formed with a high surface density. It was difficult to adjust the air permeability by the high-density layer.
Patent Document 3 provides a heat insulating material excellent in heat insulating property and sound absorbing property in which a high density nonwoven fabric is laminated on a surface portion or an inner layer of a fiber assembly composed of two or more kinds of fibers. Due to the nonwoven fabric, the sound absorption performance is limited to a specific frequency.

JP 2012-136808 A JP 2002-339213 A JP 2002-339217 A

However, the above conventional heat insulating sound absorbing material requires that the molded product has an appropriate air permeability in order to exhibit sound absorbing properties, but the improvement of the heat insulating property uses a material with low thermal conductivity. Since a static air layer is present in the molded product, if the heat insulation is improved, the air flow is retained, and the sound absorption performance is not improved. .
Therefore, the conventional heat insulating sound absorbing material has increased the thickness and weight of the heat insulating sound absorbing material in order to solve the trade-off problem. However, the increase in the thickness and weight reduces the weight of the heat insulating sound absorbing material and saves space. In particular, when the heat-absorbing and sound-absorbing material is used as an automobile interior material, it adversely affects fuel consumption and installation space. Therefore, there is a demand for a heat insulating sound absorbing material made of a material having a low thermal conductivity, lightweight and excellent in moldability, and having an air layer in the molded product, but capable of controlling air permeability appropriately.

As a means for solving the problems of the conventional heat insulating sound absorbing material or heat insulating sound absorbing molded article, the present invention comprises one or more fiber sheets having a ventilation resistance of 0.1 to 5.0 kPa · s / m. , Comprising a laminate of one or two or more breathable porous substrates, and using the powdered adhesive having a mass average particle diameter of 80 to 500 μm, the fiber sheet and the breathable porous substrate. Adiabatic sound-absorbing sound that is adhered to each other and the overall airflow resistance is set in the range of 0.3 to 6.0 kPa · s / m with the application amount or application amount of the powdery adhesive set to 1 to 50 g / m ² Providing materials.
The powdery adhesive is preferably a hot melt adhesive powder.
The fiber sheet is preferably a fiber sheet having a thickness of 0.05 to 0.3 mm and a mass per unit area of 10 to 50 g / m ² and containing at least 60% by mass or more of pulp fibers.
The porous substrate is preferably a sheet of inorganic fibers to which a synthetic resin is added to give formability.
And the heat insulation sound-absorbing-material molded object shape | molds the said heat insulation sound-absorbing material in a predetermined shape.

[Action]
In the present invention, a fiber sheet having a ventilation resistance in the range of 0.1 to 5.0 kPa · s / m is used. The fiber sheet functions as a ventilation resistance adjusting layer for imparting a desired sound absorbing performance to the heat insulating sound absorbing material by adjusting the air resistance of the heat insulating sound absorbing material of the present invention without increasing the thickness. When one layer or two or more layers of the fiber sheet and one layer or two or more layers of the air-permeable porous substrate are bonded to each other and laminated, a powdery adhesive having a mass average particle diameter of 80 to 500 μm is used, If an adhesive layer obtained by applying 1-50 g / m ² of the powdered adhesive is applied, the fiber layer or the heat-absorbing sound absorbing The air permeability of the heat insulating sound-absorbing material is set to a range of 0.3 to 6.0 kPa · s / m, which is desirable for the heat-absorbing sound-absorbing property, by the fiber sheet as the air-flow resistance adjusting layer without impeding the air-permeable property of the material. I can do it.
In general, hot-melt adhesive powder is advantageously used as such a powdery adhesive.
In order to set the ventilation resistance of the fiber sheet in the range of 0.1 to 5.0 kPa · s / m, the fiber sheet has a thickness of 0.05 to 0.3 mm and a mass per unit area of 10 to 10. 50 g / m ² is preferable. Moreover, when 60 mass% or more of pulp fibers with good heat insulation are mixed, the heat insulation of the fiber sheet is improved.
Further, when an inorganic fiber sheet imparted with formability by adding synthetic fibers is used as the porous substrate, a heat-resistant sound absorbing material having high flame retardancy or non-flammability can be obtained.
The said heat insulation sound-absorbing material is shape | molded in the shape in alignment with the application location of a motor vehicle or a building, and is used as a heat insulation sound-absorbing material molding.

〔effect〕
The present invention provides a heat-insulating and sound-absorbing material that is excellent in heat insulating properties and sound-absorbing properties and does not increase in thickness, and thus is lightweight.

Airflow resistance measurement explanatory drawing. The sectional side view of one Example of the heat insulation sound-absorbing material of this invention. Side sectional drawing of the other Example of the heat insulation sound-absorbing material of this invention. Side sectional drawing of the further another Example of the heat insulation sound-absorbing material of this invention. The sectional side view explaining the test box of heat insulation performance.

An embodiment embodying the present invention will be described in detail.
[Fiber sheet]
The fiber sheet used for the heat insulating sound-absorbing material of the present invention will be described.
Examples of fibers used for the fiber sheet material include pulp fibers, biodegradable fibers (polylactic acid fibers) made of starch extracted from plants such as corn and sugarcane, cotton, palm fibers, hemp fibers, bamboo fibers, kenaf Natural fiber such as fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, acrylic fiber, urethane fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, acetate fiber, polymetaphenylene isophthalamide fiber and poly-p-phenylene Aramid fiber such as terephthalamide fiber, polyarylate fiber, polyether ether ketone fiber, synthetic fiber such as polyphenylene sulfide fiber, inorganic fiber such as glass fiber, carbon fiber, ceramic fiber, asbestos fiber, or these fibers were used. Fiber Such regenerated fibers obtained by fibrillating product scrap and the like. These fibers may be used alone or in combination of two or more. Further, these fibers may be entangled by performing a needle punching treatment if desired.
As the fiber used for the material of the fiber sheet, a low melting thermoplastic fiber having a melting point of 180 ° C. or lower may be used together with the fiber or instead of the fiber. Examples of the low melting point thermoplastic fiber include polyolefin fibers such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, etc. having a melting point of 180 ° C. or less, polyvinyl chloride fibers, polyurethane fibers, polyester fibers. Polyester copolymer fibers, polyamide fibers, polyamide copolymer fibers, and the like. These low melting point thermoplastic fibers are used alone or in combination of two or more. The fineness of the low melting point thermoplastic fiber is preferably in the range of 0.1 to 60 dtex. As a desirable low melting point thermoplastic fiber used in the present invention, for example, a core having the above-mentioned normal fiber as a core part and a low melting point thermoplastic resin having a melting point of 100 to 180 ° C. which is a material resin of the low melting point thermoplastic fiber as a sheath. There is a sheath type composite fiber.
What is desirable as the fiber used for the material of the fiber sheet is pulp fiber. As the pulp fiber, usually, any of mechanical pulp, chemical pulp, and semi-chemical pulp made from softwood or hardwood chips can be used. By containing 60% by mass or more of the pulp fiber in the fiber sheet, good heat insulating properties can be imparted to the fiber sheet. When the content of pulp fibers is less than 60% by mass, the effect of imparting heat insulation by the pulp fibers becomes difficult to appear.
The fiber sheet may be provided as a nonwoven fabric by, for example, needle punching, fusion bonding, or the like, but may be provided as a paper sheet by preparing a slurry and making paper. Moreover, you may provide as a knitted fabric.

The fiber sheet has a ventilation resistance set in a range of 0.1 to 5.0 kPa · s / m in order to ensure good sound absorption.
Here, the ventilation resistance (Pa · s / m) is a scale representing the degree of ventilation of the breathable material. This ventilation resistance is measured by a steady flow differential pressure measurement method. As shown in FIG. 1, a test piece T is arranged in a cylindrical air passage W, and the pressure in the air passage W on the start point side of the arrow in the figure in a state of a constant air flow V (the direction of the arrow in the figure). By measuring the pressure difference between P1 and the end point P2 of the arrow in the figure, the ventilation resistance R can be obtained from the following equation.
R = ΔP / V
Where ΔP (= P1−P2): pressure difference (Pa), V: air flow per unit area (m ³ /
m ² · s).
The ventilation resistance can be preliminarily measured by, for example, an air permeability tester (product name: KES-F8-AP1, manufactured by Kato Tech Co., Ltd., steady flow differential pressure measurement method).
In order to adjust the ventilation resistance of the fiber sheet, a means for adjusting the density of the fiber sheet is generally used.

The fiber sheet may be coated or impregnated with an appropriate amount of the following synthetic resin for adjusting the airflow resistance. Examples of the synthetic resin include thermoplastic resins and / or thermosetting resins.
Examples of the thermoplastic resin include acrylic ester resin, methacrylic ester resin, ionomer resin, ethylene-ethyl acrylate (EEA) resin, acrylonitrile / styrene / acrylic rubber copolymer (ASA) resin, and acrylonitrile / styrene copolymer ( AS) resin, acrylonitrile / chlorinated polyethylene / styrene copolymer (ACS) resin, ethylene side acid vinyl copolymer (EVA) resin, ethylene vinyl alcohol copolymer (EVOH) resin, methacrylic resin (PMMA), polybutadiene (BDR), Polystyrene (PS), polyethylene (PE), acrylonitrile-butadiene-styrene copolymer (ABS) resin, chlorinated polyethylene (CPE), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polypropylene ( PP), cellulose acetate (CA) resin, syndiotactic polystyrene (SPS), polyoxymethylene (= polyacetal) (POM), polyamide (PA), polyimide (PI), polyamideimide (PAI), poly Etherimide (PEI), polyarylate (PAR), thermoplastic polyurethane (TPU) elastomer, thermoplastic elastomer (TPE), liquid crystal polymer (LCP), polyetheretherketone (PEEK), polysulfone (PSF), polyethersulfone (PES), fluororesin, polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polycarbonate (PC), polyphenylene ether (PPE), modified PPE, polyphenylene sulfide (PPS) , Polybutylene terephthalate (PBT), polybenzimidazole (PBI), wholly aromatic polyester (POB), and the like. Two or more of the above thermoplastic resins may be mixed and used, or one or two or more of the thermosetting resins may be mixed and used to such an extent that the thermoplasticity of the fiber sheet is not impaired.
Examples of the thermosetting resin include urethane resin, melamine resin, thermosetting acrylic resin, particularly thermosetting acrylic resin that cures by forming an ester bond by heating, urea resin, phenol resin, epoxy resin, thermosetting type Polyester or the like is used, but urethane resin prepolymer, urea resin prepolymer (initial condensate), phenol resin prepolymer (initial condensate), diallyl phthalate prepolymer, acrylic oligomer, polyisocyanate that produce the synthetic resin. Synthetic resin precursors such as prepolymers such as narate, methacrylic ester monomers and diallyl phthalate monomers, oligomers and monomers may be used. The thermosetting resin is preferably used in the form of an aqueous solution, an aqueous emulsion, or an aqueous dispersion because it is easy to handle, but may be used in the form of an organic solvent solution. Two or more of the above thermosetting resins or synthetic resin precursors may be used in combination.
Further, a phenolic resin is particularly desirable as the resin used in the present invention. The phenolic resin is obtained by condensing a phenolic compound with formaldehyde and / or a formaldehyde donor.
The phenolic compound used in the phenolic resin may be a monohydric phenol, a polyhydric phenol, or a mixture of a monohydric phenol and a polyhydric phenol. When only monohydric phenol is used, formaldehyde is easily released during and after curing. Therefore, polyhydric phenol or a mixture of monohydric phenol and polyhydric phenol is preferably used.

The fiber sheet may be added, coated, impregnated, or mixed with the following third component as desired.
As the third component, for example, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, alumina , Silica, colloidal silica, mica, diatomite, dolomite, gypsum, talc, clay, asbestos, mica, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, glass powder, stone powder, blast furnace slag, fly ash , Cement, zirconia powder and other inorganic fillers; natural rubber or derivatives thereof; styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, isoprene rubber, isoprene-iso Synthetic rubber such as tylene rubber; water-soluble polymers such as polyvinyl alcohol, sodium alginate, starch, starch derivatives, glue, gelatin, blood powder, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyacrylate, polyacrylamide, and natural gums; wood Organic fillers such as flour, walnut powder, coconut powder, wheat flour and rice flour; higher fatty acids such as stearic acid and palmitic acid; higher alcohols such as palmityl alcohol and stearyl alcohol; fatty acids such as butyryl stearate and glycerin monostearate Esters; fatty acid amides; natural waxes such as carnauba wax; synthetic waxes; mold release agents such as paraffins, paraffin oil, silicone oil, silicone resin, fluororesin, polyvinyl alcohol, and grease; azo Organic foaming agents such as carbonamide, dinitrosopentamethylenetetramine, P, P′-oxybis (benzenesulfonylhydrazide), azobis-2,2 ′-(2-methylgropionitrile); sodium bicarbonate, potassium bicarbonate, heavy Inorganic foaming agents such as ammonium carbonate; hollow particles such as shirasu balloon, perlite, glass balloon, foamed glass, hollow ceramics; plastic foams and foamed particles such as foamed polyethylene, foamed polystyrene, foamed polypropylene; pigments, dyes, antioxidants Agents, antistatic agents, crystallization accelerators, phosphorus compounds, nitrogen compounds, sulfur compounds, boron compounds, bromine compounds, guanidine compounds, phosphate compounds, phosphate ester compounds, amino resins, etc. Flame retardant, flame retardant, flame retardant, water repellent, oil repellent, insect repellent, antiseptic, wack S, surfactants, lubricants, antioxidants, ultraviolet absorbers, DBP, DOP, a plasticizer such as phthalic acid ester plasticizers and other tricresyl phosphate such as dicyclohexyl phthalate. Examples of the water / oil repellent include natural wax, synthetic wax, fluororesin, and silicon resin.

(Breathable porous substrate)
The breathable porous substrate used for the heat insulating sound absorbing material of the present invention will be described.
Examples of the material used for the breathable porous substrate include one or more of inorganic fibers, synthetic fibers, natural fibers, recycled fibers, low melting point thermoplastic fibers, and the like mentioned in the fiber sheet. Ventilation of fiber base materials made of fibers, or breathable polyurethane foam, breathable polyethylene foam, breathable polypropylene foam, breathable polystyrene foam, breathable phenolic resin foam, breathable melamine resin foam, etc. A porous plastic foam or a sintered body of the breathable plastic foam is used. The porous substrate may be coated or impregnated with a synthetic resin such as a thermoplastic resin or a thermosetting resin mentioned in the fiber sheet.
Among the materials listed above, those that are desirable as the material for the breathable porous material of the present invention are inorganic fibers because they have flame retardancy or incombustibility, and among them, glass fibers, ceramic fibers, and asbestos fibers are available. Is desirable because it is easy and has excellent heat insulation. The inorganic fibers may be entangled to form a breathable porous substrate, or may be bound with a synthetic resin to form a breathable porous substrate.
It said breathable porous substrate, typically a thickness of 5 to 50 mm, density is used. For ^{4kg / m 3 ~150kg / m 3} .

[Adhesive layer]
The adhesive layer used for the heat insulating sound absorbing material of the present invention will be described.
It is important that the adhesive layer has air permeability in order to ensure the sound absorbing property of the heat insulating sound absorbing material of the present invention. Examples of the adhesive used for the air-permeable adhesive layer include a powder adhesive, a spider web adhesive, and a porous sheet adhesive. Among these adhesives, a powdery adhesive is desirable in terms of easy adjustment of air permeability. In this embodiment, a hot-melt type powdered adhesive made of a polyamide resin or a polyester resin having a softening point of 110 to 160 ° C. Is used.
The powdery adhesive preferably has a mass average particle diameter of 80 to 500 μm, and the application amount or application amount is preferably 1 to 50 g / m ² . When the mass average particle diameter is less than 80 μm, or when the spraying amount or the coating amount is less than 1 g / m ² , there is a possibility that sufficient adhesive force for joining the fiber sheet and the breathable porous substrate cannot be obtained. There is sex. When the mass average particle diameter exceeds 500 μm, or when the application amount or application amount exceeds 50 g / m ² , the air permeability is impaired by filling the pores of the fiber sheet or the air-permeable porous substrate with the adhesive. There is a possibility that the sound absorbing performance required for the heat insulating sound absorbing material cannot be sufficiently exhibited.
The powdery adhesive is sprayed on the adhesive surface of the fiber sheet and / or the breathable porous substrate with a known spraying device such as a sieve or a spray roll, or the powdered adhesive is used. A dispersion liquid dispersed in water or a solvent is applied to the adhesive surface by a coating machine such as a roll coater or a knife coater.

[Insulated sound absorbing material]
The heat insulating sound-absorbing material of the present invention is composed of a laminate of one or more layers of the fiber sheet and one or more layers of the breathable porous substrate, and the fiber sheet and the breathable material. The porous porous substrate is bonded to each other through the adhesive layer. The heat insulating sound-absorbing material exhibits heat insulating performance by forming a static air layer with the breathable porous substrate, and adjusts air permeability with the fiber sheet, while suitably maintaining the heat insulating performance. It is configured so that it can exhibit excellent sound absorption performance. Further, the adhesive layer has a structure that does not hinder the air permeability between the fiber sheet and the air-permeable porous base material, so that the heat-insulating sound-absorbing material has the same heat-insulating performance and sound-absorbing performance. It functions so that it can be demonstrated.
The heat insulation sound absorbing material is set to a range of 0.3 to 6.0 kPa · s / m in overall ventilation resistance of the heat insulating sound absorbing material from the viewpoint of making both heat insulation performance and sound absorption performance suitable. The If the overall ventilation resistance of the heat insulating sound-absorbing material is less than 0.3 kPa · s / m, a still air layer cannot be maintained and good heat insulating performance cannot be obtained, and it is suitable at a predetermined frequency (4000 Hz or more). Sound absorption performance cannot be obtained. If the overall ventilation resistance of the heat insulating sound absorbing material exceeds 6.0 kPa · s / m, the heat absorbing performance can be obtained, but the sound absorbing performance cannot be obtained at a predetermined frequency (1000 Hz or more).
The structural example of the said heat insulation sound-absorbing material is shown below.
The heat insulating sound-absorbing material 1 having the configuration shown in FIG. 2 is provided with an adhesive layer 4 on one side (upper surface) of a single layer of breathable porous substrate 2, and one layer of the fiber sheet 3 passes through the adhesive layer 4. The porous porous substrate 2 is laminated on one side.
The heat insulating sound-absorbing material 1A having the structure shown in FIG. 3 is provided with adhesive layers 4 and 4 on both surfaces (upper surface and lower surface) of a single breathable porous base material 2 and two layers are interposed through the adhesive layers 4 and 4. Fiber sheets 3 and 3 are laminated on both sides of the breathable porous substrate 2.
4 is provided with adhesive layers 4 and 4 on both surfaces (upper surface and lower surface) of a single fiber sheet 3, and two layers of air-permeable porous materials are interposed through the adhesive layers 4 and 4. The base materials 2 and 2 are laminated on both surfaces of the fiber sheet 3.

[Molding]
When the heat insulating sound absorbing material 1, 1A, 1B is used for automobile interior materials, building wall materials, ceiling materials, etc., the heat insulating sound absorbing material 1, 1A, 1B is usually along the base surface to which the heat insulating sound absorbing material 1, 1A, 1B is applied. Molded into a shape. A general molding method of the heat insulating sound-absorbing materials 1, 1A, 1B is hot press molding. In the hot press molding, the molding temperature at the time of the hot press is about 150 ° C to 230 ° C.
When the synthetic resin is applied to or impregnated into the fiber sheet 3 or the porous substrate 2, the molding temperature at the time of hot pressing is a softening temperature or more if a thermoplastic resin, and a curing temperature if it is a thermosetting resin. The above temperatures are applied.

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通気性多孔質基材２には、グラスフィラメントをフェノール樹脂で結着して得られたグラスウールを使用した。該グラスウールは、厚さが１０ｍｍ、密度が５０ｋｇ／ｍ^３であった。
［接着剤層］
接着剤層４に使用する接着剤には、ポリアミド樹脂からなるホットメルト型の粉末状接着剤を使用した。該粉末状接着剤は、質量平均粒子径が１００〜１５０μｍ、軟化点が１４０℃であった。
［断熱吸音材］
上記繊維シート３の片面に篩を使用して上記粉末状接着剤を、塗布量が５ｇ／ｍ^２となるように散布し、接着剤層４を形成した。該接着剤層４の表面上に上記通気性多孔質基材２を積層した後、型面温度を１８０〜２００℃とした加熱プレス機で使用して、繊維シート３と通気性多孔質基材２とを軽く圧着することで、通気性多孔質基材２の片面に繊維シート３を積層した構成の断熱吸音材のテストピースＡ〜Ｄを作成した。
さらに同様にして、通気性多孔質基材２の両面に繊維シート３を積層した構成の断熱吸音材のテストピースＥ〜Ｈを作成した。
上記断熱吸音材のテストピースＡ〜Ｄ及びＥ〜Ｈの通気抵抗を表３に示す。
なお、以下において通気抵抗は、フラジール型通気度試験器に準じ、通気性試験機（カトーテック社製 ＫＥＳ−Ｆ８−ＡＰ１）を用い、単位面積当たりの通気量を４ｃｃ／ｓ・ｃｍ^２として測定したものとする。 [Example 1]
[Fiber sheet]
For the fiber sheet 3, paper sheets 1 to 4 having different masses per unit area were used by making a pulp fiber slurry with a normal paper machine. Table 1 shows various performances of the sheets 1 to 4 (however, “mass per unit area” is described as “weight per unit area” in the table).

[Breathable porous substrate]
As the breathable porous substrate 2, glass wool obtained by binding glass filaments with a phenol resin was used. The glass wool had a thickness of 10 mm and a density of 50 kg / m ³ .
[Adhesive layer]
As the adhesive used for the adhesive layer 4, a hot melt type powder adhesive made of polyamide resin was used. The powdery adhesive had a mass average particle diameter of 100 to 150 μm and a softening point of 140 ° C.
[Thermal insulation material]
Using a sieve on one side of the fiber sheet 3, the powder adhesive was sprayed so that the coating amount was 5 g / m ² to form an adhesive layer 4. After laminating the breathable porous substrate 2 on the surface of the adhesive layer 4, the fiber sheet 3 and the breathable porous substrate are used by using a hot press machine with a mold surface temperature of 180 to 200 ° C. The test pieces A to D of the heat insulating sound absorbing material having a configuration in which the fiber sheet 3 is laminated on one side of the breathable porous base material 2 were created.
Further, in the same manner, test pieces E to H of a heat insulating sound absorbing material having a configuration in which the fiber sheet 3 was laminated on both surfaces of the breathable porous substrate 2 were prepared.
Table 3 shows the airflow resistance of the test pieces A to D and E to H of the heat insulating sound absorbing material.
In the following, the airflow resistance is measured according to the Frazier type air permeability tester, using an air permeability tester (KES-F8-AP1 manufactured by Kato Tech Co., Ltd.) and the airflow per unit area is 4 cc / s · cm ^2. Shall be.

〔比較例２〕
グラスウールをフェノール樹脂で結着して得られた不織布を使用し、それぞれ表３に示す密度とした通気性多孔質基材２のみを単独で使用して断熱吸音材のテストピースＭ〜Ｏを作成した。
上記断熱吸音材のテストピースＭ〜Ｏの通気抵抗を表３に示す。 [Comparative Example 1]
Test pieces I to L of heat insulating sound-absorbing material were prepared in the same manner as in Example 1 except that the paper sheets 5 and 6 whose performances are shown in Table 2 were used as the fiber sheets.
Table 2 shows the ventilation resistance of the test pieces I to L of the heat insulating sound absorbing material.

[Comparative Example 2]
Using non-woven fabric obtained by binding glass wool with phenolic resin, using only the breathable porous base material 2 having the densities shown in Table 3 alone, the test pieces M to O of heat insulating sound absorbing materials are created. did.
Table 3 shows the airflow resistance of the test pieces M to O of the heat insulating sound absorbing material.

[Insulation performance test]
About the test pieces AO of the said heat insulation sound-absorbing material, the heat insulation performance test was done using the test box.
As shown in FIG. 5, the test box 10 includes a heating chamber 11 in which the dimensions of W300 × H300 × D300 (mm), the two rooms of W300 × H400 × D300 low temperature chamber 12 which is the size of (mm) Become. An upper lid 13 is detachably provided at the upper part of the low temperature chamber 12, an outside air inlet 14 having a diameter of 5 mm is provided in the heating chamber 11, and a heat insulating material 15 having a thickness of 50 mm is provided on the outer periphery of the test box 10. Is provided. In the test box 10, in the center of the boundary of the heating chamber 11 and the low temperature chamber 12, the test piece mounting frame 16 having a thickness of 15mm is provided. A test piece TP measuring 100 × 100 × 10 mm in thickness is attached to the test piece mounting frame 16 so that air does not leak from the periphery of the test piece TP.
Thermal insulation performance test, attaching the test piece TP to the test piece mounting frame 16, by operating the heater H of the heating chamber 11, after the temperature of the heating chamber 11 reaches 80 ° C., placed in a low temperature chamber 12 operating the suction device 17, which is, via a heated air test piece TP of the heating chamber 11 by utilizing the fact that transmitted to the low temperature chamber 12, the low-temperature chamber at predetermined time (minutes) 12 This is done by measuring the temperature inside and observing the increase in temperature. The respective inside of the heating chamber 11 and the low temperature chamber 12 and the fan 18 is provided, equilibrium temperature of each chamber is maintained respectively by during the test they fan 18 is operated.
The room temperature of the installation environment of the test box 10 is set to 20 ± 1 ° C., and the temperature in the heating chamber 11 is confirmed with the thermometer TM1 and kept at 80 ± 1 ° C. during the heat insulation performance test. temperature of the low temperature chamber 12 is measured by thermometer TM2.
Table 4 shows the results of the heat insulation performance test.

From Table 4, in Example 1, the test pieces A to D obtained by laminating the fiber sheet on one side of the breathable porous base material have a smaller temperature rise as the ventilation resistance increases, and the temperature of the low temperature chamber after 10 minutes. Was about 39 ° C to 43.5 ° C. Test pieces E to H in which fiber sheets are laminated on both sides of a breathable porous base material have slightly improved heat insulation properties compared to test pieces A to D, but the temperature of the low temperature chamber after 10 minutes is 38 ° C. to 43 ° C. The temperature was about 5 ° C., almost the same as the test pieces A to D.
In Comparative Example 1, the test piece I in which the fiber sheet is laminated on one side of the breathable porous substrate has a small ventilation resistance of 0.02 kPa · s / m (less than 0.1 kPa · s / m). The ventilation resistance of the whole heat-insulating sound-absorbing material is also as small as 0.23 kPa · s / m (less than 0.3 kPa · s / m), the static air layer cannot be maintained, the temperature rises quickly, and the temperature of the cold room after 10 minutes Rose to 46.5 ° C. On the other hand, the test piece J has a large ventilation resistance of 6.2 kPa · s / m (over 5.0 kPa · s / m), and the ventilation resistance of the entire heat insulating sound absorbing material is 6.4 kPa · s / m. It was large (over 6.0 kPa · s / m), a still air layer could be maintained, the temperature rise was small, and the temperature of the low temperature chamber after 10 minutes was 37.5 ° C. The test piece K in which the fiber sheet is laminated on both sides of the breathable porous substrate is the same as the test piece I at the temperature of the low temperature chamber of 46.5 ° C. after 10 minutes, and the test piece L is 10 minutes later. The temperature of the low greenhouse was 37.0 ° C., which was the same as that of test piece J.
From the test results of Example 1 and Comparative Example 1, it was found that the temperature rise in the low temperature room, that is, the heat insulation performance, can be adjusted by the ventilation resistance of the fiber sheet.
In Comparative Example 2, the test piece M relates to a conventional heat insulating sound-absorbing material not provided with a fiber sheet, and has a small ventilation resistance of 0.23 kPa · s / m (less than 0.3 kPa · s / m) and is stationary. The air layer could not be maintained and the temperature rose rapidly, and the temperature in the low temperature chamber after 10 minutes had risen to 47.5 ° C. As compared with Example 1 in which the density of the breathable porous substrate was also 50 kg / m ² , the temperature rise was clearly large.
The test piece N has a ventilation resistance of 1.03 kPa · s / m, substantially the same ventilation resistance as the test piece B of Example 1, and the temperature of the low temperature chamber after 10 minutes is also substantially the same as 43.5 ° C. is there.
The test piece O has a ventilation resistance of 2.67 kPa · s / m, which is similar to the test piece D of Example 1, and the temperature of the low temperature chamber after 10 minutes is substantially the same as 39.0 ° C. is there.
Therefore, although the heat insulation performance can be made substantially the same by increasing the density and making the ventilation resistance substantially the same as in Comparative Example 2, use a fiber sheet with an appropriate ventilation resistance as in Example 1. Thus, it was shown that a low density, that is, light weight, can exhibit the same degree of heat insulation performance.

[Sound absorption performance test]
With respect to the test pieces A to H of Example 1 and the test pieces I to O of Comparative Examples 1 and 2, the normal incident sound absorption coefficient (%) having a thickness of 10 mm was measured according to JIS-A1405. The results are shown in Table 5.
In addition, the test piece in which the fiber sheet was laminated only on one side of the breathable porous base material was arranged so that the fiber sheet faced the sound source side.

From Table 5, although test piece AD which laminated | stacked the fiber sheet in Example 1 on the single side | surface of the air permeable porous base material has some differences with the air flow rate of a fiber sheet, the whole ventilation resistance of a heat insulation sound-absorbing material. Is in the range of 0.3 to 6.0 kpa · s / m, and the sound absorption rate (%) is approximately 70% or higher at approximately 2000 Hz or higher, and the sound absorption performance is good. Further, the test pieces E to H in which the fiber sheets are laminated on both sides of the breathable porous base material have a larger ventilation resistance than the test pieces A to D, but the ventilation resistance is still 0.3 to 6.0 kpa · s. The sound absorption performance is almost the same as that of the test cases A to D, and no extreme difference is observed.
In Comparative Example 1, the test piece I in which the fiber sheet is laminated on one side of the breathable porous base material has a small ventilation resistance of 0.24 kpa · s / m as a whole (0.3 kpa · s / m). Less), and the sound absorption coefficient is as bad as 58% at 4000 Hz. In addition, the test piece J has a large ventilation resistance of 6.40 kpa · s / m (over 6.0 kpa · s / m), and the sound absorption coefficient is as high as 64% at 800 Hz, but 1000 Hz or more. It gets worse. The test piece K in which the fiber sheet is laminated on both surfaces of the breathable porous substrate shows the same tendency as the test piece I, and the test piece L shows the same tendency as the test piece J. Therefore, it can be seen that the test pieces J and L have good heat insulation performance, but have a low sound absorption rate, and do not have both heat insulation performance and sound absorption performance.
In Comparative Example 2, the test piece M, like J, has a low ventilation coefficient of 0.23 kpa · s / m (less than 0.3 kpa · s / m) and a poor sound absorption coefficient, as in the case of J. The test piece N has a ventilation resistance of 1.03 kpa · s / m as a sound absorbing material, which is almost the same as the test piece B of Example 1, and the sound absorbing performance is almost the same, but the density is large and the weight is large. It can be seen that the test piece O has a ventilation resistance of 2.67 kpa · s / m, which is almost the same as the test piece D of Example 1 and substantially the same sound absorption performance, but the density is tripled and becomes very heavy. .
That is, it was found that the test pieces A to H of Example 1 satisfy both the heat insulation performance and the sound absorption performance and are lightweight.

[Example 2]
Pulp fiber: Polyester fiber, 95: 5, a mixed fiber sheet having a mass per unit area of 22 g / m ² , a thickness of 0.12 mm, and a ventilation resistance of 0.98 kPa · s / m is used as a fiber layer. On one side, as a reinforcing layer, a non-woven fabric by a spunbond method having a mass per unit area of 15 g / m ² is used, and a hot-melt type powder adhesive made of polyester (particle size: 100 to 150 μm, melting point: 110 ° C.) is used. A fiber sheet in which a reinforcing layer is laminated on the fiber layer was prepared by laminating and bonding via an adhesive layer formed so as to be applied in an amount of 5 g / m ² .
The obtained fiber sheet was laminated on both surfaces of a breathable porous substrate having a density of 50 kg / m ³ and a thickness of 20 mm made of glass wool, with the fiber layer side of the fiber sheet contacting the breathable porous substrate. In the same manner, using the above hot melt type powder adhesive, spray coating adhesion lamination was similarly performed so that the coating amount was 5 g / m ^2, and a heat insulating sound absorbing material having a ventilation resistance of 1.50 kPa · s / m was obtained. Obtained. This material is lightweight, has excellent heat insulation properties, and good sound absorption properties, and is useful as a heat insulation sound absorbing material for houses.

Example 3
Hot melt adhesive powder made of polyamide (particle size: 150 to 200 μm, melting point: 130 ° C.) is applied at a coating amount of 2 g / m ² on the surface of the fiber sheet side of the fiber sheet obtained in Example 2, 140 to Heating was performed in a heating furnace at 150 ° C., and the hot melt adhesive powder was fused to the fiber sheet to form an adhesive layer.
Next, an initial condensate (20% aqueous solution) of phenol-alkylresorcin-formaldehyde as a synthetic resin is impregnated so as to have a coating amount of 15% by mass with respect to the reinforcing fiber sheet, and then heated and dried at 100 to 120 ° C. By pre-curing the synthetic resin, a reinforcing fiber sheet coated with the B-state synthetic resin was obtained. Further, the obtained reinforcing fiber sheet is made of a polyester fiber mixed with 20% by mass of a low melting point polyester fiber, and laminated on one side of a breathable porous substrate having a thickness of 40 mm and a density of 25 kg / m ³ , The molded product was molded into a predetermined shape with a heat compression molding machine whose mold temperature was adjusted to 200 ° C. to obtain a heat-insulated sound-absorbing material molded product.
The obtained heat-insulating sound-absorbing material molded product has a difference depending on the molding part, but has an average density of 30 kg / m ³ and a ventilation resistance of 1.02 to 1.8 kPa · s / m. As an interior / exterior part of an automobile, it has excellent heat insulation and sound absorption.

  The heat insulating sound-absorbing material of the present invention is excellent in heat insulating properties and sound absorbing properties, and does not increase in thickness, and is therefore lightweight, and thus can be used industrially.

DESCRIPTION OF SYMBOLS 1 Heat insulation sound-absorbing material 2 Breathable porous base material 3 Fiber sheet 4 Adhesive layer

Claims (5)

It consists of a laminate of one or more layers of fiber sheets having a ventilation resistance of 0.1 to 5.0 kPa · s / m and one or more layers of a breathable porous substrate,
The fiber sheet and the breathable porous substrate are bonded to each other using a powdery adhesive having a mass average particle diameter of 80 to 500 μm, and the amount of the powdered adhesive applied or the amount of application is 1 to As 50 g / m ²
The heat insulation sound-absorbing material, wherein the entire ventilation resistance is set in a range of 0.3 to 6.0 kPa · s / m.   The heat insulating sound-absorbing material according to claim 1, wherein the powdery adhesive is a hot-melt adhesive powder. The fiber sheet is a fiber sheet having a thickness of 0.05 to 0.3 mm, a mass of 10 to 50 g / m ² per unit area, and containing at least 60% by mass or more of pulp fibers. The heat insulation sound-absorbing material described.   The heat insulating sound-absorbing material according to any one of claims 1 to 3, wherein the porous base material is a sheet of inorganic fibers to which a synthetic resin is added to impart formability. A heat insulating sound absorbing material molded article, wherein the heat insulating sound absorbing material according to any one of claims 1 to 4 is formed into a predetermined shape.

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