JP2022035812A - Complex - Google Patents

Abstract

To provide a complex having excellent sound absorbing characteristics and heat insulating performance.SOLUTION: In a complex 3, at least a portion of the surface of a member 31 having a generation source of heat and/or sound is covered by a high rigid resin foamed body 1 in which 10%-compression strength at 25°C-100°C is equal to or more than 0.1 MPa. An interval is prepared between the member and the high rigid resin foamed body, in at least the portion of a part covered by the high rigid resin foamed body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a complex.

Conventionally, the foam has been used as a material for absorbing impact and vibration (Patent Document 1).
Further, the conventional laminate containing the urethane resin foam is excellent in sound absorption and heat insulation, and is used as a cover material for covering the upper part and the surroundings of the engine (Patent Document 2). However, since the rigidity at high temperature decreases, it does not have self-supporting property when used as a covering material, and it is used by directly attaching it to the engine, or by attaching a urethane resin foam and a rigid resin material. There were restrictions on how to use it.

JP-A-2019-162816 Japanese Patent No. 6091782

In recent years, there has been a demand for weight reduction of products, and there has been a demand for weight reduction of parts in products. In many of these products that are required to be miniaturized and lightweight, a member having a source of sound or heat is incorporated. The use of a foam that is lighter than a solid resin product is being considered as a covering material for a member that has a source of these sounds and heat, and a highly rigid foam with excellent sound absorption and heat insulation is required. Has been done. The foam of Patent Document 1 is not sufficient in terms of rigidity and heat insulating properties, and no study has been made on sound absorption. Further, the laminated body presented in Patent Document 2 cannot be said to be sufficient from the viewpoint of the heat retention performance of the engine.

It has been found that it is effective to provide an air layer having a specific thickness between the object to be heat-retained and sound-absorbed in order to exhibit better heat insulating properties or sound-absorbing properties.
Therefore, an object of the present invention is to provide a complex having excellent sound absorption and heat insulating properties.

That is, the present invention is as follows.
[1]
At least a part of the surface of the member having a heat and / or sound source is covered with a high-rigidity resin foam having a 10% compressive strength of 0.1 MPa or more at 25 ° C to 100 ° C.
A space is provided between the member and the high-rigidity resin foam in at least a part of the portion covered with the high-rigidity resin foam.
A complex characterized by that.
[2]
The complex according to [1], wherein the high-rigidity resin foam is a hard resin foam containing a hard resin and has an independent cavity inside.
[3]
The complex according to [1] or [2], wherein the high-rigidity resin foam is a hard resin foam containing a hard resin and has an uneven shape on the surface.
[4]
The complex according to any one of claims 1 to 3, which is composed of a plurality of portions and has a movable portion in at least one of them.

Since the complex of the present invention has the above-mentioned structure, it is excellent in sound absorption and heat insulation.

It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment. (A) is a state in which the interval 32 communicates with the outside. (B) is a state in which the interval 32 is closed. It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment using a high-rigidity resin foam having an uneven shape 11. It is a schematic diagram (cross-sectional view) which shows an example of the composite of this embodiment which provided the breathable fiber layer 2 on one surface of a high-rigidity resin foam. It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment using a high-rigidity resin foam having an independent cavity part 12. It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment using a high-rigidity resin foam having an independent cavity part 12. It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment which duct 33 connected to the interval 32. It is a schematic diagram (cross-sectional view) which shows an example of the complex of this embodiment which duct 33 connected to the interval 32. It is a schematic diagram which shows an example of the shape of the preliminary foaming particle. (A) and (b) are examples of a shape in which a part of a hollow substantially circle is cut out and cross sections are overlapped, and (c) is an example of a shape in which a hollow circular cross section is overlapped. It is the schematic explaining the evaluation method of the independence of an Example. It is a figure explaining the shape of the heat sound member used in an Example.

Hereinafter, embodiments for carrying out the present invention (hereinafter, simply referred to as “the present embodiment”) will be described in detail. The following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. The present invention can be appropriately modified and carried out within the scope of the gist thereof.

The complex of the present embodiment contains at least a high-rigidity resin foam.
The composite of the present embodiment is a high-rigidity resin foam in which at least a part of the surface of a member having a heat and / or sound source has a 10% compression strength of 0.1 MPa or more at 25 ° C to 100 ° C. At least a part of the portion covered and covered with the high-rigidity resin foam is provided with a space between the member and the high-rigidity resin foam.

[High rigidity resin foam]
The high-rigidity resin foam has a 10% compressive strength of 0.1 MPa or more at 25 ° C to 100 ° C as measured by the method of JISK7220-2006. The rigidity is excellent because the 10% compressive strength at 25 ° C to 100 ° C is 0.1 MPa or more. Further, when the 10% compressive strength is within the above range, the foam itself has self-sustaining property, and an air layer having a specific thickness can be provided between the foam and the object to be heat-retained and sound-absorbed. It also has excellent sound absorption.
Above all, from the viewpoint of long-term durability, it is preferable that the 10% compressive strength at 150 ° C. is 0.1 MPa or more.

The high-rigidity resin foam is preferably a foam containing a hard resin, and more preferably a foam containing only a hard resin as a resin component.
The high-rigidity resin foam may further contain an additive in addition to the hard resin.

(Hard resin)
The hard resin refers to a resin having a flexural modulus of 1000 MPa or more measured by the method of measuring the flexural modulus by ISO1209 at 23 ° C. As the hard resin foam of the present embodiment, a foam having excellent sound absorption and heat insulating properties can be obtained by using the hard resin. The foam obtained by using the resin component having a high elastic modulus has low deformability of the resin component, the space between the resin component and the heat sound member is appropriately maintained, and the air permeability is ensured, so that the sound absorption property is increased. Further, when a surface pressure is applied to the foam in contact with the heat conductor, in the case of a hard resin, the compression on the surface is small, so that the low density is maintained, the heat conduction in the surface direction is low, and the heat insulating property is excellent. Further, even in a foam having an uneven surface, the surface is less deformed and the heat insulating property is maintained.
Above all, from the viewpoint of obtaining a member that stably exhibits more excellent sound absorption and heat insulating properties, the flexural modulus is preferably 1500 MPa or more, and more preferably 2000 MPa or more.

Examples of the hard resin include polyamide resin, polyamide resin, polyester resin, polyether resin, methacrylic resin, modified polyether resin (phenylene ether-polystyrene alloy resin), hard polyolefin resin, polystyrene resin, and hard polyurethane resin. , Hard polyvinyl chloride resin and the like. Among them, a polyamide resin, a hard polyolefin resin, and a modified polyether resin (phenylene ether-polystyrene alloy resin) are preferable from the viewpoint of further excellent sound absorption and heat insulating properties.
The hard resin may be used alone or in combination of two or more. When combining the resins, it is preferable that the mixed resin is also hard.

Examples of the polyamide-based resin include polyamide homopolymers, polyamide copolymers, and mixtures thereof.
Examples of the polyamide homopolymer include nylon 66, nylon 610, nylon 612, nylon 46, nylon 1212, etc. obtained by polycondensation of diamine and dicarboxylic acid, nylon 6, nylon 12 and the like obtained by ring-opening polymerization of lactam. Can be mentioned.
Examples of the polyamide copolymer include nylon 6/66, nylon 66/6, nylon 66/610, nylon 66/612, nylon 66 / 6T (T represents a terephthalic acid component), and nylon 66 / 6I (T). I represents an isophthalic acid component), nylon 6T / 6I, and the like.
Examples of the mixture of the polyamide homopolymer and / or the polyamide copolymer include a mixture of nylon 66 and nylon 6, a mixture of nylon 6/66 and nylon 6, and a mixture of nylon 6/66 and nylon 66. , Nylon 66 and Nylon 612, Nylon 66 and Nylon 610, Nylon 6 and Nylon 612, Nylon 6 and Nylon 610, Nylon 66 and Nylon 6I, Nylon 66 and Nylon Examples thereof include 6T, a mixture of nylon 6 and nylon 6I, a mixture of nylon 6 and nylon 6T, and the like.
Above all, from the viewpoint of the balance between physical properties such as sound absorption and heat insulation and foam molding processability, nylon 6, a mixture of nylon 66 and nylon 6, a mixture of nylon 6/66 and nylon 6, nylon 6/66 and nylon 66 A mixture with and is preferred.

Examples of the hard polyolefin resin include homopolymers or copolymers of olefinic monomers, and examples thereof include polypropylenes such as homotype polypropylene, random type polypropylene, and block type polypropylene, polybutene, and ethylene-propylene copolymers. Be done. Of these, a hard propylene homopolymer is preferable from the viewpoint of rigidity and impact resistance.

The mass ratio of the hard resin to 100 parts by mass of the foam is preferably 80 to 100 parts by mass from the viewpoint of further excellent balance between physical properties such as sound absorption and heat insulating properties and foam molding processability. It is preferably 85 to 95 parts by mass.
The mass ratio of the polyamide resin to 100 parts by mass of the foam is preferably 80 to 100 parts by mass from the viewpoint of the balance between physical properties such as sound absorption and heat insulating properties and foam molding processability. More preferably, it is 85 to 95 parts by mass.
The mass ratio of the rigid polyolefin resin to 100 parts by mass of the foam is 80 to 100 parts by mass from the viewpoint of further excellent balance between physical properties such as sound absorption and heat insulating properties and foam molding processability. Is preferable, and more preferably 85 to 95 parts by mass.

(Additive)
If necessary, ordinary compounding agents such as antioxidants, light stabilizers, ultraviolet absorbers, flame retardants, dyes, colorants such as pigments, plasticizers, lubricants, crystallization nucleating agents, talc, charcoal cal, etc. Inorganic fillers and the like may be contained depending on the purpose. In particular, it is possible to use an inorganic filler for the purpose of imparting rigidity at high temperatures.
As the flame retardant, a bromine-based or phosphorus-based flame retardant can be used, and as the antioxidant, a phenol-based, phosphorus-based, sulfur-based or other antioxidant can be used, and the above-mentioned light stability can be used. As the agent, a light stabilizer such as a hindered amine type or a benzophenone type can be used.
The above additives may be added as long as the object of the present invention is not impaired.

The mass ratio of the additive to 100 parts by mass of the foam is preferably more than 0 parts by mass and 30 parts by mass or less, more preferably 0.1 to 10 parts by mass, from the viewpoint that the effect of the additive is easily exhibited. Parts, more preferably 0.1 to 2 parts by mass.

(Manufacturing method of foam)
The foam can be produced by, for example, an extrusion foaming method, an injection foaming method, a bead foaming method (in-mold foaming method), a stretch foaming method, a solvent extraction foaming method, or the like.
In the extrusion foaming method, an organic or inorganic foaming agent is press-fitted into a molten resin using an extruder, and the pressure is released at the outlet of the extruder to have a plate-like, sheet-like, or columnar shape having a certain cross-sectional shape. It is a method of obtaining the foam of.
The injection foaming method is a method of obtaining a foam having pores by injection molding a resin having foamability and foaming it in a mold.
In the bead foaming method or the in-mold foaming method, foamed particles (preferably pre-foamed particles) are filled in the mold and heated with steam or the like to expand the foamed particles and at the same time heat-fuse the foamed particles to each other. It is a method of obtaining a foam.
The stretch foaming method is a method in which an additive such as a filler is kneaded in a resin in advance and the resin is stretched to generate microvoids to obtain a foam.
The solvent extraction foaming method is a method in which an additive that dissolves in a predetermined solvent is added to a resin, and a molded product is immersed in a predetermined solvent to extract the additive to obtain a foam.

The high-rigidity resin foam can be obtained by incorporating (impregnating) a foaming agent into a resin composition containing the hard resin and an optionally added additive to cause foaming. The method for incorporating (impregnating) the foaming agent in the resin composition is not particularly limited, and may be a generally used method.

Such methods include a method of using an aqueous medium in a suspension system such as water (suspension impregnation), a method of using a heat-decomposable foaming agent such as sodium bicarbonate (foaming agent decomposition), and a gas having a critical pressure or higher. There are methods such as a method of bringing the gas into a liquid phase state and bringing it into contact with the base resin (liquid phase impregnation), and a method of setting the gas to an atmosphere below the critical pressure and putting it in a gas phase state and bringing it into contact with the base resin (gas phase impregnation). Can be mentioned.

The foaming agent is not particularly limited, and examples thereof include compounds that can be used as air or gas.
Examples of compounds that can be gas include inorganic compounds such as carbon dioxide, nitrogen, oxygen, hydrogen, argon, helium, and neon; trichlorofluoromethane (R11), dichlorodifluoromethane (R12), chlorodifluoromethane (R22), tetra. Fluorocarbons such as chlorodifluoroethane (R112) dichlorofluoroethane (R141b) chlorodifluoroethane (R142b), difluoroethane (R152a), HFC-245fa, HFC-236ea, HFC-245ca, HFC-225ca; HFO-1234y, HFO-1234ze (E). ) And the like; saturated hydrocarbons such as propane, n-butane, i-butane, n-pentane, i-pentane, neopentane; dimethyl ether, diethyl ether, methyl ethyl ether, isopropyl ether, n-butyl ether, diisopropyl ether. , Ethers such as furan, furfural, 2-methylfuran, tetrahydrofuran, tetrahydropyran; chlorinated hydrocarbons such as methyl chloride and ethyl chloride; alcohols such as methanol and ethanol; and the like.
These compounds that can be used as air or gas may be used alone or in combination of two or more.

The foaming agent is preferably one that has little impact on the environment and is not flammable or supportive, and from the viewpoint of safety during handling, a non-flammable inorganic compound is more preferable, and a cured resin (preferably polyamide). Carbon dioxide gas (carbon dioxide gas) is particularly preferable from the viewpoint of solubility in (based resin) and ease of handling.

The method for causing foaming in the resin composition containing (impregnated) the foaming agent is not particularly limited, but for example, by bringing the resin composition impregnated with the foaming agent from a high pressure atmosphere to a low pressure atmosphere at once. , A method of expanding the gas as a foaming agent dissolved in the resin composition to cause foaming, or by heating with pressure steam or the like, the gas in the resin composition is expanded and foamed. And the like.

If it is necessary to adjust the average bubble diameter of the resin foamed particles, a bubble adjusting agent may be added. As the bubble adjusting agent, the inorganic nucleating agent includes talc, silica, calcium silicate, calcium carbonate, aluminum oxide, titanium oxide, diatomaceous earth, clay, baking soda, alumina, barium sulfate, aluminum oxide, bentonite and the like. Usually, 0.005 to 2 parts by mass is added to the total amount of the raw material of the resin foam particles.

[Shape of preliminary foam particles]
The pre-foamed particles (preferably polyamide pre-foamed particles) can be given an arbitrary three-dimensional shape. Due to this three-dimensional shape, a communication void can be generated in the foam molded body to impart sound absorption performance. The orthophoto image of the preliminary resin foamed particles can take any shape, but the general solid bead shape is a substantially spherical one in which the orthophoto image has a circular or elliptical shape. means.
Having a hollow portion means that the orthophoto image of the preliminary foamed particles has a hollow region inside and an outer peripheral region surrounding the hollow circular region, and the orthophoto image having such a hollow region and the outer peripheral region It means that there is a direction to be obtained.
Further, having a concave outer shape means that the shape of the resin foamed particles is selected so that the concave outer shape satisfies the conditions of the recess and / or the condition of the through hole. This makes it possible to satisfactorily form communication voids (continuous voids, communicating voids) of the foamed molded product after fusion molding.

The concave outer shape portion of the pre-foamed particles may be a through hole or not a through hole, but it is particularly preferable that the pre-foamed particles have a shape having a recess. By taking a shape with recesses, a filled state that was not found in conventional pre-foamed particles can be obtained, and the structure of the communication voids of the foamed molded product obtained after molding has a particularly excellent balance in both sound absorption performance and mechanical strength. It can be realized.

A particularly excellent shape having the recesses is a structure in which the pre-foamed particles are provided with groove-shaped recesses, and the pre-foamed particles are adjacent to each other when the pre-foamed particles are heat-sealed during the production of the foamed molded product. By joining the foamed particles in a partially meshed filled state, a foamed molded product having a large bonding area between the preliminary foamed particles and having high strength is formed, and at the same time, the grooves of the adjacent preliminary foamed particles are connected. When joined, voids across the foam molding body, that is, communication voids, are formed.

The groove-shaped recesses include, for example, a shape (FIGS. 8A and 8B) in which cross sections of a shape (C shape, U shape, etc.) obtained by cutting out a part of a hollow substantially circle are overlapped, and a substantially large number of hollow portions. Examples thereof include a shape in which a cross section obtained by cutting out a part of a polygon (triangle, quadrangle, etc.) is overlapped. Here, the hollow in the hollow substantially circle and the hollow substantially polygon may be a substantially circle or a substantially polygon, but is preferably the same shape as the shape surrounding the hollow. .. Further, a shape in which the center of the hollow shape and the center of the shape surrounding the hollow overlap (for example, an O shape of concentric circles) is preferable.
Examples of the hollow portion include a shape in which hollow circles (circles, ellipses) are stacked (FIG. 8 (c)).
It can be confirmed that the pre-foamed particles have a hollow portion or a concave outer shape portion by observing and determining the transmission image of the pre-foamed particles while changing the observation direction of the particles with an optical microscope.

(shape)
The average thickness of the hard resin foam is preferably 5 to 80 mm, more preferably 8 to 50 mm, from the viewpoint of sound absorption performance, rigidity, strength and lightness.

The hard resin foam preferably has an uneven shape on at least a part of the surface (FIG. 2). The uneven shape may be formed on only one surface of the hard resin foam, or may be formed on both sides. Further, the uneven shape may be provided on the entire surface or may be provided on a part of the surface. The uneven shape preferably occupies 30 to 100% with respect to 100% of the total area (total surface area) of one surface, and more preferably 40 to 95%. The area where the uneven shape is provided may be the same or different on one surface and the other surface.

The uneven shape may be one or a plurality (FIG. 2).
The number of uneven shapes provided on one surface of the hard resin foam is preferably 100 to 1,000,000 pieces / m ² , and more preferably 1,000 to 10,000 pieces / m ² .
The area of one uneven shape is preferably 30 to 1000 mm ² , more preferably 50 to 500 mm ² . Here, the area of the uneven shape is the plan-viewing area of the portion bulging and the portion dented from the flat portion surface formed in parallel on the front and back of the hard resin foam. When the flat portion surface does not exist, it means the respective plan-viewing areas of the individual convex portions and concave portions formed in the surface shape.

The outer boundary shape of the above-mentioned uneven shape in a plan view is not particularly limited, and may be a circular shape, a polygonal shape, or a shape in which these are combined. Further, when there are a plurality of uneven shapes, each uneven shape may be the same or different.

For each of the uneven shapes, the absolute value of the displacement of the thickness of the uneven shape from the average thickness of the hard resin foam is preferably 3 mm or more, more preferably 7 to 20 mm, still more preferably 8 to 10 mm. Is. Here, the absolute value of the displacement of the thickness of each uneven shape is defined by the difference between the thickness of the upper 5% point and the thickness of the lower 5% point of the thickness distribution measured for the points on the surface of each uneven shape.
Further, for all the uneven shapes provided on the surface of the hard resin foam, the average value of the absolute value of the displacement of the thickness of the uneven shape from the average of the thickness of the hard resin foam is more excellent in sound absorption. From the viewpoint, it is preferably 5 mm or more, more preferably 7 to 20 mm, still more preferably 8 to 10 mm.
The upper limit of the above-mentioned average value of the absolute value of the displacement of the thickness of the uneven shape may be the ratio of the length of the average value of the absolute value of the displacement to the average thickness of 100% described later.

For each of the above-mentioned uneven shapes, the ratio of the absolute value of the displacement of the thickness of the uneven shape to the average thickness of 100% of the hard resin foam is preferably 80% or less, more preferably 0.1 to 50%, and further. It is preferably 1 to 20%.
Further, all the uneven shapes provided on the surface of the hard resin foam are the absolute value of the deviation of the thickness of the uneven shape from the average thickness of the hard resin foam with respect to the average thickness of 100% of the hard resin foam. The ratio of the average value is preferably 80% or less, more preferably 0.1 to 50%, still more preferably 1.0 to 20%, from the viewpoint of further excellent sound absorption and heat insulating properties.
The uneven shape can be formed, for example, by forming a flat plate and then cutting it.

The average characteristic length of the uneven shape is the length of a line segment connecting the centers of gravity included in each adjacent Voronoi polygon by arranging points at the position of the center of gravity of the outer shape of each uneven shape and dividing the surface into Voronoi. A value defined as the average of the values. In particular, when the concavo-convex structure forms a periodic arrangement, it coincides with the period, and even in the case of an aperiodic arrangement, it is used to define the concavo-convex shape as a numerical value that characterizes the distance in the plane direction between the concavo-convex structures.
In the uneven shape, the average characteristic length of the unevenness is preferably 5 to 200 mm, more preferably 15 to 150 mm, still more preferably 20 to 80 mm from the viewpoint of being able to control the frequency range of the sound absorption coefficient.
The average characteristic length of the unevenness is measured by manual drawing from a photograph of the surface shape in the case of a simple shape, and image analysis is performed from the surface profile data by three-dimensional shape measurement in the case of a complicated shape. It can be measured by such means.

From the viewpoint of further excellent heat insulating properties and light weight, the hard resin foam preferably has an independent cavity portion that does not communicate with the outside other than the cavity formed by the voids between the foam particles inside the foam (FIG. 3). ). The independent cavity includes a cavity that communicates with the outside through a small gap (FIG. 4).
The cavity may be one or a plurality. With respect to 100% of the volume (total volume including foamed bubbles and independent cavities) surrounded by the outer shape of the hard resin foam, from the viewpoint of achieving both excellent heat insulation and lightness and the mechanical strength of the foam. The ratio of the total volume occupied by the independent cavity is preferably 5 to 70%, more preferably 10 to 60%.
The independent cavity is formed inside the foam by means of providing a bubble containing a gas that causes a pressurized portion inside in the foaming process, for example, the whole after putting the foam in the mold. A method of expanding and deforming a foam by inserting a hollow needle into the foam and injecting gas while heating it to a temperature higher than the softening temperature, and then cooling it. It is possible to sublimate the solid substance later, or to disperse the solid substance soluble in the solvent before foam molding, place it, and infiltrate the solid substance into the solvent after molding to dissolve, extract and remove it to form a cavity. Is. Further, the cavity is not formed in a single foam body, but can be formed by a method such as forming a plurality of foams and then fusing them by fusion or adhesion to assemble a void foam.
The independent cavity portion refers to a cavity having a volume of 10 mm ³ or more, and preferably 100 to 100,000 mm ³ . The volume of the independent cavity is measured by using the volume additiveness from the bulk density of the molded body including the cavity and the bulk density of a sample obtained by separately cutting out the portion of the molded body not including the cavity. can do.
As a cavity that communicates with the outside through a slight void, when the foam is viewed from one surface side in a plan view, the area of the cavity that communicates with the outside is 100%, and the cavity communicates with the outside. The area ratio is preferably 10% or less, more preferably 5% or less, still more preferably 3% or less. By communicating the hollow portion with the outside through a slight gap portion, it is possible to improve the sound insulation performance and the heat insulating property when laminated.

(Characteristic)
(10% compressive strength)
From the viewpoint of independence, the high-rigidity resin foam has a 10% compressive strength at 25 to 100 ° C. of 0.1 MPa or more, preferably 0.5 to 100 MPa, and more preferably 1.0 to 100 MPa. It is 50 MPa.
From the viewpoint of long-term durability, the high-rigidity resin foam preferably has a 10% compressive strength at 150 ° C. of 0.1 MPa or more, more preferably 0.5 to 100 MP.
The above 10% compressive strength can be measured by the method of JISK7220-2006.
The 10% compressive strength can be adjusted, for example, by using the above-mentioned suitable hard resin and setting the mass ratio of the resin in the foam to the above-mentioned suitable range.

(Reverberation room method sound absorption coefficient)
The reverberation room method sound absorption coefficient in the 400 to 2000 Hz range measured when the thickness of the hard resin foam is 20 mm is preferably 3% or more and 95% or less, more preferably 5 to 90%, still more preferably. It is 10 to 85%. The reverberation room method sound absorption coefficient in the 400 to 2000 Hz range is, for example, the flat thickness of the foam and the uneven structure shape of the surface, in which the mass ratio of the resin in the foam is within the above-mentioned suitable range using the above-mentioned suitable hard resin. It can be adjusted by adjusting.
Further, the hard resin foam preferably has an average value of the reverberation room method sound absorption coefficient of 800 to 1600 Hz of 40% or more and 92% or less, more preferably 50 to 90%, still more preferably 60 to 80%. Is. The average value of the reverberation room method sound absorption coefficient of 800 to 1600 Hz can be adjusted, for example, by using the above-mentioned suitable hard resin and setting the mass ratio of the resin in the foam to the above-mentioned suitable range.
The reverberation room method sound absorption coefficient is a value measured in accordance with JIS A1409.

(density)
The density of the hard resin foam is preferably 0.01 to 0.60 g / cm ³ , more preferably 0.05 to 0.50 g / cm ³ , and even more preferably 0.10 to 0.40 g / cm ³ . Is.

In the composite of the present embodiment, the hard resin foam may be used by laminating with other materials. Examples of the other materials include a skin material, a metal base material, a third layer, and the like, which will be described later.

[Skin material]
The skin material has a function of ensuring the rigidity of the molded product with the skin material, and is a relatively hard member. These can be formed by ordinary molding methods such as injection molding and press molding using ordinary materials such as resin and metal. The rigidity of this substrate is determined by the type of material and the wall thickness of the formed substrate, but considering the weight reduction of the molded product with the skin material and the reduction of the material cost, it is expected to show high rigidity even with a thin wall thickness. It is preferable to use various materials.

The thickness of the skin material (for example, a sheet for skin material) is not particularly limited, but is preferably 3 μm to 3 mm, more preferably 10 μm to 2 mm.

In order to manufacture the skin material sheet, a molding method such as inflation molding, T-die molding, calender molding, or roll molding can be adopted. The skin material sheet is another suitable skin material sheet, for example, isotactic or syndiotactic polypropylene, high density polyethylene, low density polyethylene (LDPE, or LLDPE), polystyrene, for the purpose of improving physical properties. , Polyethylene terephthalate, ethylene-vinyl acetate copolymer (EVA) and the like can be multi-layered, and the multi-layered sheet is also included in the above-mentioned skin material sheet.

Specific examples of the resin constituting such a skin layer (resin sheet) include polypropylene (PP), ethylene vinyl acetate (EVA), polyethylene (PE, high-density polyethylene (HDPE), etc.), and polyacetal (POM). ), Polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene ether (PPE) polyphenylene sulfide (PPS), polyamide (PA, nylon 6, nylon 6, 6, etc.), polyetheretherketone (PEEK), etc. Sex resins such as acrylonitrile-butadiene-styrene copolymer (ABS), polystyrene (PS), acrylonitrile-styrene copolymer (AS), polycarbonate (PC), polyvinyl chloride (PVC), polymethacrylic acid methyl ester ( Examples thereof include amorphous resins such as PMMA).
The resins constituting these skin materials can be used alone or in combination of two or more.

[Metal base material]
The metal base material is not particularly limited and may be appropriately selected depending on the intended use. For example, when weight reduction is emphasized, as the material of the metal base material, for example, an aluminum plate, an aluminum alloy plate, a magnesium plate, a magnesium alloy plate, or the like is preferable. When mechanical strength is important, the metal base material 4 is preferably iron, steel, stainless steel, copper, copper alloy, manganese, manganese alloy, titanium, titanium alloy, or the like. When vibration damping is important, the metal base material is preferably magnesium, a magnesium alloy, an iron-based alloy, a copper alloy, a manganese alloy, or the like.
Further, the skin material may be provided with a design decorated by printing, painting or the like.

[Third layer]
The third layer is a material for joining the skin material and the foam layer, and is, for example, an adhesive layer. At the time of molding, the adhesive layer is melted and polymerized to form a solidified bonding layer. Further, when the resin is attached to one surface side of the skin material, if the resin melts at the time of molding, the resin is melted and then solidified, and the skin material and the foam layer are more firmly bonded.

The method of joining the skin material to the foam layer via the adhesive layer is not particularly limited. For example, the foam layer and the surface provided with the adhesive layer of the skin material may be opposed to each other and interposed between the molding dies of the heat press machine, heated and pressurized, and then cooled to be joined. ..

Since the high-rigidity resin foam has excellent sound absorption and heat insulating properties, it can be suitably used for sound absorbing materials and automobile members, particularly sound absorbing materials and automobile members used under high temperature conditions, and specifically, insulators and automobile members. It can be suitably used for an engine cover, other cover-shaped parts, and the like.
Since the high-rigidity resin foam has excellent sound absorption and heat insulating properties, it can be suitably used as a covering material for heat and / or sound sources. For example, it is difficult for heat from a heat source to escape to the outside, and the heat of the heat source can be maintained for a long period of time even after the power of the heat source is turned off, improving the efficiency at the time of restarting the operation and up to the steady operation state after the restart. can do. At that time, the sound is less likely to leak to the outside. In addition, since it is rigid, it is easy to design with excellent sound insulation and heat insulation by providing a gap between the heat source and the sound source as self-sustaining.

[Complex]
The composite of the present embodiment includes a member having a heat and / or sound source (sometimes referred to as a "heat sound member" in the present specification) and the above-mentioned high-rigidity resin foam.
In the composite of the present embodiment, the number of the heat sound members may be one or a plurality. Further, the number of the high-rigidity resin foams may be one or a plurality.

(Covered part)
In the complex, it is preferable that at least a part of the surface of the thermal noise member is covered with the high-rigidity resin foam. The entire surface of the thermal noise member may be covered with the high-rigidity resin foam, or a part of the thermal noise member may be covered with the high-rigidity resin foam.
The number of high-rigidity resin foams covering the surface of the thermal sound member may be one or a plurality.

The ratio of the surface area of the heat sound member covered by the high-rigidity resin foam is preferably 50% or more with respect to 100% of the surface area of the heat sound member from the viewpoint of further excellent sound absorption and heat insulation. It is preferably 60% or more, more preferably 70% or more. Further, from the viewpoint of cost, it is preferably less than 100%, more preferably 90% or less.
In the present specification, the portion of the thermal sound member covered with the high-rigidity resin foam may be referred to as a “covered portion”.

(interval)
In the covering portion, it is preferable that a gap 32 is provided between the heat sound member 31 and the high-rigidity resin foam 1 at least in part (FIGS. 1 to 7).
It is preferable that the covering portion is provided with a space except for the connection portion 35 between the thermal noise member and the high-rigidity resin foam. The ratio of the area where the interval is provided in the covering portion is preferably 80% or more, more preferably 90% or more, with respect to 100% of the surface area of the thermal sound member of the covering portion.

The above-mentioned interval refers to the distance of the space portion between the thermal sound member and the high-rigidity resin foam.
In the covering portion, the interval may be constant or may differ depending on the position (FIGS. 1 to 7). For example, when a plurality of high-rigidity resin foams are included, the above intervals may be different depending on each high-rigidity resin foam (FIGS. 1 to 7).

The interval is preferably 0.2 to 50 mm, more preferably 0., From the viewpoint that the covering material does not occupy an excessive space and it is easy to maintain the temperature at the time of operation after the operation of the thermal heating member is stopped. It is 2 to 30 mm.
In the complex of the present embodiment, when there are places where the intervals are different, it is preferable that the above range is satisfied at any place. For example, when the surface of the high-rigidity resin foam is provided with a concavo-convex shape, it is preferable that the above range is satisfied at any of the locations farthest from the concavo-convex shape thermal sound member and the location closest to the concavo-convex shape.

The location closest to the above interval is preferably 0.1 to 10 mm from the viewpoint of suppressing natural convection of air existing in the gap and reducing the heat transfer count from the heat temperature member to the air layer. , More preferably 0.2 to 5 mm, still more preferably 0.5 to 2 mm.

(Connection part)
The connection portion 35 is a portion for fixing the high-rigidity resin foam on the thermal sound member. The connection portion may be made of the same material as the high-rigidity resin foam (FIGS. 1 to 7), or may be made of a different material. The connection portion 35 may be a member having elasticity such as a spring from the viewpoint of making it difficult to transmit an external impact to the heat sound member.

(movable part)
The complex of the present embodiment preferably has a movable portion capable of changing the length of the interval (FIGS. 1 (a) and 1 (b), the movable portion is not shown). In the movable portion, the spacing of the entire covering portion may be changed, or the spacing of a part of the covering portion may be changed (FIGS. 1A and 1B).
The movable portion changes the length of the interval into a state in which the interval communicates with the outside (FIG. 1 (a)) and a state in which the interval is closed (FIG. 1 (b)). It is preferable to have a switching function. For example, when the heat sound member is in operation and heat is generated, the heat of the heat sound member is released to the outside by communicating the interval with the outside, and the heat of the heat sound member is generated after the heat sound member is stopped. If you want to keep the above constant, you may close the above interval. From the viewpoint of adjusting the temperature of the heat sound member to a target range, the interval may be closed during the operation of the heat sound member.

In the composite of the present embodiment, when the surface of the high-rigidity resin foam is provided with an uneven shape, it is preferable that the surface of the high-rigidity resin foam is provided with an uneven shape on the surface of the thermal noise member side. (Fig. 2).
Further, when the high-rigidity resin foam is provided with a cavity that communicates with the outside through a slight gap, the void may be provided on the surface of the high-rigidity resin foam on the thermal sound member side. Preferred (Fig. 5).

(Other layers)
The composite of the present embodiment has another layer such as a breathable fiber layer 2 between the high-rigidity resin foam and the thermal sound member from the viewpoint of further excellent sound absorption and heat insulation. It may be good (Fig. 3).
Examples of the breathable fiber layer include synthetic fiber non-woven fabrics such as polyester non-woven fabrics (polyethylene terephthalate non-woven fabrics and the like), polyamide non-woven fabrics (nylon non-woven fabrics and the like), glass fiber non-woven fabrics, glass fiber papers and the like.
The breathable fiber layer is preferably highly breathable. The breathable fiber layer preferably has an oxygen permeability of 4.5 cm 3/24 hm ² or more as measured in accordance with ASTM ^D3985-95 .

The breathable fiber layer is preferably provided on the surface of the high-rigidity resin foam (FIG. 3). When another layer such as a breathable fiber layer is provided on the surface of the high-rigidity resin foam, the interval may be the interval between the other layer and the thermal noise member.

(Duct, silencer mechanism)
The complex of the present embodiment may include a duct 33 (FIG. 6).
The duct 33 is preferably connected to the interval 32 (FIG. 6). For example, when the heat sound member is operated, the duct may be operated to release the heat of the interval 32 to the outside, and when it is desired to keep the heat of the heat sound member constant after the heat sound member is stopped, the duct may be stopped. ..
The duct may be provided with a muffling mechanism 34 from the viewpoint of making it difficult for the sound generated from the duct or the heat sound member to leak to the outside.

(Heat sound member)
The heat sound member is not particularly limited as long as it is a member having a heat and / or sound source, and a member having a heat and sound source is preferable. Among them, vehicle drive sources such as engines and drive motors, transmission gears and the like can be mentioned.
In the composite of the present embodiment, the heat generated during the operation of the heat sound member can be easily retained in the composite body even after the heat sound member is stopped, and the burden on the heat sound member at the time of restarting is reduced. In addition, since the temperature inside the composite body quickly returns to the temperature at the time of steady operation of the thermal noise member after restarting, the operating efficiency after restarting is improved. In addition, sound is less likely to leak to the outside during operation.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[High rigidity resin foam]
(Manufacturing Example 1)
Polyamide 6/66 resin (2430A, manufactured by DSM Co., Ltd., flexural modulus of 2600 MPa by ISO1209 at 23 ° C., surface tension of 46 mN / m at 20 ° C., indicated as "PA" in the table), talc 0.8%. The strands melted using an extruder and discharged from the extrusion die were pelletized under water to obtain pellets having an average particle diameter of 1.4 mm. The melting point of this pellet was 193 ° C. The obtained pellets were immersed in a constant temperature water bath heated to 50 ° C. for 30 minutes, then put into a pressure cooker at 10 ° C., and 4 MPa of carbon dioxide gas was blown into them to absorb them for 12 hours. Then, the carbon dioxide impregnated pellets were transferred to a foaming apparatus, and air at 200 ° C. was blown for 20 seconds to obtain an aggregate of polyamide foamed particles. The obtained polyamide pre-foamed particles had a foaming ratio of 4.2 times that of a solid spherical cross-sectional shape, an average particle diameter of 2.3 mm, and an average diameter of closed cells of 0.15 mm. ..

By encapsulating the obtained polyamide prefoamed particles in an autoclave, compressed air was introduced over 1 hour until the pressure in the autoclave reached 0.9 MPa, and then the pressure was maintained at 0.9 MPa for 24 hours. , Polyamide prefoamed particles were pressure treated.
The pressure-treated polyamide prefoamed particles were filled in the cavity of the in-mold molding die (cavity dimensions: length: 300 mm, width: 300 mm, height: 20 mm), and then the mold was compacted. Then, the saturated steam at 115 ° C. is supplied into the cavity for 10 seconds, and then the saturated water vapor at 122 ° C. is supplied into the cavity for 10 seconds to foam and heat-fuse the polyamide prefoamed particles. Pre-foamed particles were molded into foam. The obtained foam was cooled by supplying cooling water into the cavity of the mold, and then the mold was opened to take out the polyamide foam molded product. The specific volume of this polyamide foam molded product after drying was 6.0 (cc / g).

(Manufacturing Example 2)
A hard polypropylene foam (trade name "Peblock", manufactured by JSP, density 0.03 kg / L) was used.

(Manufacturing Example 3)
An uneven shape was provided on one surface of the flat plate-shaped high-rigidity resin foam of Production Example 1 by cutting. As the uneven shape, a truncated cone-shaped recess having an area of 120 mm ² on the front side surface, 35 mm on the front side surface, a diameter of 20 mm on the bottom side, and a depth of 15 mm was provided in a square arrangement with a period of 40 mm in length and 40 mm in width. The number of uneven shapes per unit area was 625 pieces / m ² .

(Manufacturing Example 4)
Inside the flat plate-shaped hard resin foam of Production Example 1, an independent cavity portion that does not communicate with the outside is provided by a method in which two flat plates are symmetrically shaped and then the two plates are adhered to each other. The number of independent cavities was 400 / m ² , and the ratio of the volume occupied by the independent cavities to 100% of the volume surrounded by the outer shape of the hard resin foam was 30%.
It should be noted that the independent cavity portion does not have a slight void portion.

(Manufacturing Example 5)
Polyamide 6/66 resin (2430A, manufactured by DSM Co., Ltd., surface tension of 46 mN / m at 20 ° C., indicated as "PA" in the table) and 0.8% of talc are melted using an extruder and extruded into a deformed shape. The strands discharged from the die were pelletized under water to obtain pellets having an average particle diameter of 1.4 mm. The melting point of this pellet was 193 ° C. The obtained pellets were immersed in a constant temperature water bath heated to 50 ° C. for 30 minutes, then put into a pressure cooker at 10 ° C., and 4 MPa of carbon dioxide gas was blown into them to absorb them for 12 hours. Then, the carbon dioxide impregnated pellets were transferred to a foaming apparatus, and air at 200 ° C. was blown for 20 seconds to obtain an aggregate of polyamide foamed particles. The obtained polyamide pre-foamed particles have a foaming magnification of 4.0 times the cross-sectional shape shown in FIG. 8C, an average particle diameter of 2.5 mm, and an average diameter of closed cells of 0.15 mm. there were.
By encapsulating the obtained polyamide prefoamed particles in an autoclave, compressed air was introduced over 1 hour until the pressure in the autoclave reached 0.9 MPa, and then the pressure was maintained at 0.9 MPa for 24 hours. , Polyamide prefoamed particles were pressure treated.
The pressure-treated polyamide prefoamed particles were filled in the cavity of the in-mold molding die (cavity dimensions: length: 300 mm, width: 300 mm, height: 20 mm), and then the mold was compacted. Then, the saturated steam at 115 ° C. is supplied into the cavity for 10 seconds, and then the saturated water vapor at 122 ° C. is supplied into the cavity for 10 seconds to foam and heat-fuse the polyamide prefoamed particles. Pre-foamed particles were molded into foam. The obtained foam was cooled by supplying cooling water into the cavity of the mold, and then the mold was opened to take out the polyamide foam molded product. The specific volume of this polyamide foam molded product after drying was 5.5 (cc / g).

(Manufacturing Example 6)
Instead of the hard resin, a soft urethane sponge (Inoac Calmflex F-2, flexural modulus 0.2 MPa by ISO1209 at 23 ° C., indicated as "PU" in the table) was used as the soft resin foam. A characteristic evaluation was carried out.

<Evaluation>
The following measurements were performed on the foams obtained in Production Examples 1 to 6.

(Elastic modulus)
The elastic modulus of the resin used in Production Examples 1, 2, 5 and 6 was measured by the following method, and a hard resin or a soft resin was determined. In the case of producing a foam, the flexural modulus of the resin was measured according to ISO1209, and 1000 MPa or more was determined to be a hard resin, and less than 1000 MPa was determined to be a soft resin.
As a comparative example, when a foam, which is an industrial product that is substantially a single resin type, is used, it is difficult to measure the resin component, but the flexural modulus is measured assuming volume buildability. The value calculated by Mρ / ρ0 from the value M, the density ρ of the foam, and the measured value of the density ρ0 of the resin portion can be determined as the flexural modulus of the resin.

(10% compressive strength)
The 10% compressive strength of the resin foams used in Examples and Comparative Examples was measured by the following method.
The 10% compressive strength (MPa) of the effervescent molded product (20 mm × 20 mm × 20 mm) that had been vacuum dried at 40 ° C. for 24 hours or more after molding was measured in accordance with JIS K7220. This was performed using an autograph (AG-5000D) type manufactured by Shimadzu Corporation. The compressive strength was measured under the conditions of heating to 100 ° C. and 150 ° C. using a dedicated high temperature measuring cell.
Further, the 10% compressive strength of the resin foams of Examples and Comparative Examples was measured at 25 ° C to 100 ° C. The 10% compressive strength from 25 ° C. to 100 ° C. was measured at a temperature in increments of 15 ° C., and the minimum value was obtained.
Further, the 10% compressive strength at 150 ° C. was measured by the same method.

(Autonomy)
The foam was processed to a width of 10 mm, a thickness of 5 mm, and a length of 150 mm, and the foam was allowed to stand so that the distance between the fulcrums (the fulcrum of R15 mm) was 100 mm, and the amount of deflection due to its own weight at this time was measured (FIG. 8). ..
When the amount of deflection at 100 ° C. or 150 ° C. was 1 mm or less, it was evaluated as ⊚ (excellent), when it was more than 1 mm and less than 2 mm, it was evaluated as 〇 (good), and when it was 2 mm or more, it was evaluated as × (defective).

(Surface uneven shape)
The surface of the resin foam was measured with a three-dimensional shape measuring device product name "Quick Vision PRO" manufactured by Mitutoyo, and the displacement of the thickness of the uneven shape was measured. The length of the absolute value of the displacement (mm) and the ratio (%) of the length of the absolute value of the displacement to the average thickness of 100% of the resin foam were calculated.
In addition, using the image analysis software "A Image-kun" and Asahi Kasei Engineering Co., Ltd., the uneven region is extracted and the position of the center of gravity is calculated by binarizing the image, and the average value of the distance between the centers of gravity is calculated by dividing the boronoi. The average characteristic length of.

(Thermal insulation properties)
For the heat insulating property of the foam, the thermal conductivity ([W / (m · K)]) by the steady AC method based on ISO22007-6 was measured. The reference substances were air (0.0262 [W / (m · K)]) and water (0.610 [W / (m · K)]).

[Complex]
(Example 1)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 1 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the heat sound member covered with the high-rigidity resin foam was set to 80%.
As the heat sound member, an internal cavity (FIG. 9) having an outer shape (A6061) of aluminum, 600 mm (W) × 400 mm (L) × 600 mm (H), and a wall thickness of 34.5 mm was used.

(Example 2)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 2 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the heat sound member covered with the high-rigidity resin foam was set to 80%.
Aluminum (A6061) of 600 mm × 500 mm was used as the heat sound member.

(Example 3)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 3 processed to a thickness of 20 mm to obtain a composite. The average characteristic length of the unevenness of the uneven shape was 44 mm.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the heat sound member covered with the high-rigidity resin foam was set to 80%.

(Example 4)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 4 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the heat sound member covered with the high-rigidity resin foam was set to 80%.

(Example 5)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 5 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the heat sound member covered with the high-rigidity resin foam was set to 80%.

(Example 6)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 1 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the thermal sound member covered by the high-rigidity resin foam was set to 60%.

(Example 7)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 1 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat-sounding member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat-sounding member and set to 2 mm. The ratio of the surface area of the thermal sound member covered by the high-rigidity resin foam was set to 80%.

(Example 8)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 1 processed to a thickness of 10 mm to obtain a composite.
The distance between the heat-sounding member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat-sounding member and set to 2 mm. The ratio of the surface area of the thermal sound member covered by the high-rigidity resin foam was set to 80%.

(Comparative Example 1)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 1 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat-sounding member and the high-rigidity resin foam in the coated portion was set to 0 mm, which was constant on the entire surface of the heat-sounding member. The ratio of the surface area of the thermal sound member covered by the high-rigidity resin foam was set to 60%.

(Comparative Example 2)
The thermal noise member was coated with the high-rigidity resin foam of Production Example 6 processed to a thickness of 20 mm to obtain a composite.
The distance between the heat sound member and the high-rigidity resin foam in the covering portion was set to be constant on the entire surface of the heat sound member and was set to 10 mm. The ratio of the surface area of the thermal sound member covered by the high-rigidity resin foam was set to 60%.

<Evaluation>
(Thermal insulation properties)
The temperature of the inner cavity of aluminum was allowed to stand in a constant temperature room, and it was confirmed that the temperature reached 120 ° C. Then, the temperature inside the cavity was measured after the composite of the heat sound member of the cavity and the resin foam was left in an environment of 15 ° C. for 8 hours.
The temperature of the cavity was the average value of the temperatures of any five points of the internal cavity.
Table 1 shows the difference between the temperature before the start of the test and the temperature after the 8-hour standing test.

(Sound absorption)
Five evaluators listened to the sound of the speaker sound source installed in the aluminum internal cavity at a distance of 1 m from the composite of the heat sound member of the cavity and the resin foam, and covered the resin foam. The degree to which the volume was lowered was evaluated as compared with the volume heard without doing. The case where all five evaluators evaluated that the volume was lowered was evaluated as excellent (〇), and the case where any one of the evaluators was not evaluated as decreased was evaluated as inferior (×).

1 High-rigidity resin foam 11 Concavo-convex shape 12 Independent cavity 2 Breathable fiber layer 3 Composite 31 Thermal sound member 32 Spacing 33 Duct 34 Silent mechanism

Claims (4)

At least a part of the surface of the member having a heat and / or sound source is covered with a high-rigidity resin foam having a 10% compressive strength of 0.1 MPa or more at 25 ° C to 100 ° C.
A space is provided between the member and the high-rigidity resin foam in at least a part of the portion covered with the high-rigidity resin foam.
A complex characterized by that. The composite according to claim 1, wherein the high-rigidity resin foam is a hard resin foam containing a hard resin and has an independent cavity inside. The complex according to claim 1 or 2, wherein the high-rigidity resin foam is a hard resin foam containing a hard resin and has an uneven shape on the surface. The complex according to any one of claims 1 to 3, which is composed of a plurality of parts and has a movable part in at least one of them.

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