Sound insulation structure

Abstract

The present invention addresses the problem of providing a soundproofing structure that yields sufficient soundproofing effects even in a case where an adhesive layer is provided, and resists deviation in the frequency band produced by the soundproofing effects. This soundproofing structure: has a sheet-like sheet section and a plurality of projections provided on the sheet section, and at least has an adhesive layer provided on the surface, of the sheet section, on the side opposite that on which the projections are provided; and satisfies formula (1).　(1): E_glue / I_glue > 0.5 × (E_membrane / H) E_glue (MPa): Storage modulus of adhesive layer I_glue (mm): Average thickness of adhesive layer E_membrane (MPa): Storage modulus of sheet section and projections H (mm): Average height of sheet section and projections

Description

[Technical field]

[0001] The present invention relates to a sound insulation structure. [Background technology]

[0002] In buildings such as apartment buildings, office buildings, and hotels, quietness suitable for indoor use is required by blocking outdoor noise from automobiles, trains, airplanes, ships, etc., and equipment noise and human voices generated inside the building. In addition, in vehicles such as automobiles, trains, airplanes, and ships, it is necessary to reduce indoor noise in order to block wind noise and engine noise and provide a quiet and comfortable space for passengers. For this reason, research and development of means for blocking the transmission of noise and vibration from the outdoors to the indoors, or from the outside of the vehicle to the indoors, that is, vibration-damping and sound-insulating means, has been promoted. In recent years, lightweight vibration-damping and sound-insulating members are required in buildings due to the increase in height, and lightweight vibration-damping and sound-insulating members are also required in vehicles to improve energy efficiency. Furthermore, in order to improve the design freedom of buildings, vehicles, and their facilities, vibration-damping and sound-insulating members that can be used with complex shapes are required.

[0003] Generally, the characteristics of vibration-damping and sound-insulating materials follow the so-called mass law. In other words, the transmission loss, which is an index of the amount of noise reduction, is determined by the logarithm of the product of the mass of the vibration-damping and sound-insulating material and the frequency of the elastic wave or sound wave. Therefore, in order to increase the amount of noise reduction at a certain frequency, the mass of the vibration-damping and sound-insulating material must be increased. However, the method of increasing the mass of the vibration-damping and sound-insulating material places a limit on the amount of noise reduction due to the constraints of the mass of buildings, vehicles, etc.

[0004] In order to solve the problem of increased mass of vibration-damping and sound-proofing members, improvements have been made to the member structure. For example, a method of combining a plurality of rigid flat plate materials such as gypsum board, concrete, steel plate, glass plate, resin plate, etc., and a method of forming a hollow double-wall structure or a hollow triple-wall structure using gypsum board, etc. are known.

[0005] In recent years, in order to realize sound insulation performance that exceeds the mass law, a plate-type acoustic metamaterial sound insulation panel has been proposed that combines a high-rigidity flat plate material with a resonator. Specifically, a sound insulation panel in which multiple independent stump-shaped protrusions (resonators) made of silicone rubber and tungsten or multiple independent stump-shaped protrusions (resonators) made of rubber are provided on an aluminum substrate (see Non-Patent Documents 1 and 2), and a sound insulation panel in which multiple independent stump-shaped protrusions (resonators) made of silicone rubber or silicone rubber and a lead cap are provided on an epoxy substrate (see Non-Patent Document 3) have been proposed. Also, a sound-proof sheet member has been proposed that includes a sheet having viscoelasticity and a resonating portion that includes a base and a weight portion (Patent Document 1). Also, a structure in which vibration-damping and sound-proofing materials are laminated and bonded via an elastic adhesive has been disclosed (Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2017 / 135409 [Patent Document 2] Patent Publication No. 2001-303691 [Non-patent literature]

[0007] [Non-Patent Document 1] MB Assouar, M. Senesi, M. Oudich, M. Ruzzee and Z. Hou, Broadband plate-type acoustic metamaterial for low-frequency sound attenuation, Applied Physics Letters, 2012, volume 101, pp 173505. [Non-Patent Document 2] M. Oudich, B. Djafari-Rouhani, Y. Pennec, MB Assouar, andB. Bonello, Negative effective mass density of acoustic metamaterial plate decorated with low frequency resonant pillars, Journal of Applied Physics, 2014, volume 116, pp 184504. [Non-Patent Document 3] M. Oudich, Y. Li, MB Assouar, and Z. Hou, A sonic band gap based on the locally resonant phononic plates with stubs, New Journal of Physics, 2010, volume 12, pp 083049. Summary of the Invention [Problem to be solved by the invention]

[0008] The soundproof sheet described in Patent Document 1 is relatively lightweight yet has high soundproofing performance that exceeds the mass law, and is easy to manufacture and durable. However, the adhesion method, materials, and conditions are not fully examined in detail, with only a description that various methods are possible. That is, the installation method is not particularly limited, and examples thereof include a method of bonding separately molded parts by heating and pressurizing or by pressurizing them, a method of bonding them using various known adhesives, and a method of joining them by heat welding, ultrasonic welding, laser welding, etc. Examples of adhesives that have been mentioned include epoxy resin adhesives, acrylic resin adhesives, polyurethane resin adhesives, silicone resin adhesives, polyolefin resin adhesives, polyvinyl butyral resin adhesives, and mixtures of these adhesives, but these have not been particularly examined in detail. However, the applicant's research has revealed that depending on the state (film thickness, properties) of the adhesive layer formed by the adhesive, the sound insulation effect may be insufficient, or there may be a shift in the frequency band in which the sound insulation effect occurs.

[0009] The present invention has been made in view of the above background art. The object (object) of the present invention is to provide a sound insulation structure that can obtain a sufficient sound insulation effect even when an adhesive layer is provided, and that is less likely to cause a shift in the frequency band in which the sound insulation effect occurs.

[0010] In addition to the objectives stated here, the present invention can also be positioned as another objective of achieving effects that are derived from the various components shown in the description of the embodiments of the invention described below, and that cannot be obtained by conventional techniques. [Means for solving the problem]

[0011] The inventors have developed a sheet-like Department The inventors have found that the above-mentioned problems can be solved by using a sound-insulating structure having a plurality of convex portions provided on the sheet portion, in which the sheet is installed by an adhesive layer having specific mechanical properties and a specific shape, and have thus completed the present invention.

[0012] That is, the present invention provides various specific embodiments as shown below. [1] A sound-insulating structure having at least a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to the side on which the convex portions are provided, wherein the sound-insulating structure satisfies the following formula (1): E_glue / I_glue>0.5×(E_membrane / H) (1) E_glue (MPa): Storage modulus of adhesive layer I_glue(mm): Average thickness of adhesive layer E_membrane(MPa): Storage modulus of the sheet and protrusions H(mm): Average height of sheet and protrusions [2] A sound-proofing member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to the side on which the convex portions are provided, A sound-insulating structure having a normalized natural frequency shift amount satisfying the following formula of 0 to 30%. Normalized natural frequency shift (%) = ((design natural frequency) - (natural frequency)) ÷ (design natural frequency) Design natural frequency (Hz): Natural frequency calculated without adhesive layer Natural frequency (Hz): Natural frequency calculated with adhesive layer [3] A sound-insulating structure comprising: a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion; and an adhesive layer provided on a surface of the sheet portion opposite the side on which the convex portions are provided, wherein the adhesive layer has an elastic modulus of greater than 10 MPa. [4] The sound-insulating structure according to any one of [1] to [3], which has an adherend to which the sound-insulating member is adhered via the adhesive layer. [5] The sound insulation structure according to [4], which satisfies the following formulas (2) and (3): 7000≧E_glue / E_membrane≧0.5 (2) 50.0≧E_glue / E_adh≧0.00002 (3) E_glue (MPa): Storage modulus of adhesive layer E_membrane(MPa):Sheet Parts and protrusions Storage modulus of E_adh(MPa): Storage modulus of adherend [6] The sound insulation structure according to any one of [1] to [5], which satisfies the following formula (4): 1.0≧I_glue≧0.005 (4) I_glue(mm): Average thickness of adhesive layer [7] The sound insulation structure according to any one of [1] to [6], wherein the formula (1) satisfies the following formula (1)': E_glue / I_glue>β×(E_membrane / H) (1)' In the above formula (1)', E_glue, I_glue, E_membrane, and H represents E_glue, I_glue, E_membrane, and H in the above formula (1). Similarly, β=5 。 [8] The E_glue according to any one of [1] to [7], wherein the E_glue is greater than 10 MPa. Soundproofing structure. [9] The sound-proofing structure according to any one of [1] to [8], wherein the adhesive layer contains one or more resins selected from the group consisting of silicone-based resins, epoxy-based resins, and cyanoacrylate-based resins, and the total content of these resins in the adhesive layer is 10% by weight or more.

[10] The adhesive layer contains an inorganic filler, and the content of the inorganic filler in the adhesive layer The sound insulation structure according to any one of [1] to [9], wherein the proportion is 1% by weight or more.

[11] A method for manufacturing a sound-insulating structure having a sound-insulating member having a sheet-like sheet portion and a plurality of protrusions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to the side on which the protrusions are provided, comprising: A step of forming a sound-insulating member having a plurality of protrusions on one surface of a sheet portion; and providing an adhesive layer on the sound-insulating member; and A method for manufacturing a sound-proof structure, which satisfies the following formula (1): E_glue / I_glue>0.5×(E_membrane / H) Formula (1) E_glue (MPa): Storage modulus of adhesive layer I_glue(mm): Average thickness of adhesive layer E_membrane(MPa): Storage modulus of the sheet and protrusions H(mm): Average height of sheet and protrusions

[12] The method for manufacturing a sound-insulating structure according to

[11] , further comprising the step of providing an adherend to which the sound-insulating member is adhered via the adhesive layer. Effect of the Invention

[0013] According to the present invention, it is possible to provide a sound-insulating structure that can obtain a sufficient sound-insulating effect even when an adhesive layer is provided, and that is less likely to cause a shift in the frequency band in which the sound-insulating effect occurs. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view showing a sound insulation structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line II-II of FIG. [Diagram 3] 1 is a schematic perspective view showing a sound insulation structure according to an embodiment of the present invention. [Figure 4] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. [Diagram 5] 1 is a diagram showing a simplified model illustrating the operating principle of the sound insulation structure according to the present embodiment. FIG. [Figure 6] 1 is a diagram showing a simplified model illustrating the operating principle of the sound insulation structure according to the present embodiment. FIG. [Figure 7] 1 is a graph showing a load-displacement curve obtained by measurement with an indentation hardness tester. [Figure 8] 1 is a cross-sectional view of a sound insulation structure according to an embodiment of the present invention. [Figure 9] 1 is a schematic perspective view showing a sound insulation structure according to an embodiment of the present invention. [Figure 10] 10 is a cross-sectional view taken along line IV-IV of FIG. 9. [Figure 11] 1A is a schematic perspective view showing a resonator including a base and a weight having a through hole, and FIG. 1B is a schematic perspective view showing the weight having a through hole. [Figure 12] 1 is a schematic perspective view showing a sound insulation structure according to an embodiment of the present invention. [Figure 13] 1 is a schematic perspective view showing a sound insulation structure according to an embodiment of the present invention. [Figure 14] 1A to 1C are diagrams illustrating an example of a manufacturing process for a sound-insulating member. [Figure 15] 1A to 1C are diagrams illustrating an example of a manufacturing process for a sound-insulating member. [Figure 16] 1A to 1C are diagrams illustrating an example of a manufacturing process for a sound-insulating member. [Figure 17]1A to 1C are diagrams illustrating an example of a manufacturing process for a sound-insulating member. [Figure 18] FIG. 1 is a schematic diagram of a unit cell used in estimating the natural frequency. [Figure 19] FIG. 1 is a schematic diagram of a unit cell used in estimating the natural frequency. [Figure 20] FIG. 1 is a schematic diagram of a unit cell used in estimating the natural frequency. [Figure 21] FIG. 1 is a schematic diagram of a unit cell used in estimating the natural frequency. [Figure 22] FIG. 13 is a graph showing the relationship between the normalized natural frequency shift amount and β in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following describes in detail the embodiments of the present invention, but these descriptions are merely examples (representative examples) of the embodiments of the present invention, and the present invention is not limited to these contents as long as they do not depart from the gist of the present invention. In addition, in this specification, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. In addition, the dimensional ratio of the drawings is not limited to the illustrated ratio. In addition, in this specification, for example, the expression of a numerical range such as "1 to 100" includes both the lower limit value "1" and the upper limit value "100". The same applies to the expression of other numerical ranges. In addition, in this specification, "plurality" refers to two or more.

[0016] <Sound insulation structure> A sound-insulating structure (hereinafter also simply referred to as a "sound-insulating structure") that is one embodiment of the present invention is a sound-insulating structure that has at least a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite the side on which the convex portions are provided, and that satisfies the following formula (1). E_glue / I_glue>0.5×(E_membrane / H) (1) E_glue (MPa): Storage modulus of adhesive layer I_glue(mm): Average thickness of adhesive layer E_membrane(MPa): Storage modulus of the sheet and protrusions H(mm): Average height of sheet and protrusions Hereinafter, each embodiment of the present invention will be described with reference to the drawings. Note that each of the following embodiments is an example for explaining the present invention, and the present invention is not limited to only the embodiment. In addition, in this specification, a "protrusion" or a "resonating portion" refers to all of a plurality of protrusions or resonating portions, respectively, unless otherwise specified.

[0017] In addition to the above configuration, the sound insulation structure further has an adhesive layer to insulate the sound. Materials 1 and 2 respectively show the present invention. invention 1A and 1B are schematic perspective views and a cross-sectional view taken along the line II-II of FIG. 1A, showing an embodiment in which the sound insulation structure according to the first embodiment of the present invention is provided with the adherend (hereinafter also referred to as "sound insulation structure 1"). The sound insulation structure 1 includes a sound insulation member 12 having a sheet-like sheet portion 10 and a plurality of protrusions 11 provided on the sheet portion, an adherend 13, and an adhesive layer 14 for bonding the sound insulation member to the adherend 13. Note that the protrusions are in principle composed of resonating parts, but protrusions shown in FIGS. 12 and 13, which will be described later, are also included as components. In the following description, the protrusions are also referred to as resonating parts except in the description of the protrusions. Note that in FIGS. 12 and 13, the protrusions 11 and the protrusions 31 are separately described as resonating parts, but the protrusions are conceptually included in the protrusions. In this sound-proofing structure 1, when sound waves are incident from a noise source on the adherend 13 side, for example, resonance occurs in the sheet part 10 and / or the resonating part 11. At this time, a frequency range can exist in which the direction of the force acting on the adherend 13 is opposite to the direction of the acceleration occurring in the sheet part 10 and / or the resonating part 11, and a complete acoustic band gap occurs in which the vibration of a specific frequency is almost completely absent as a result of a partial or complete cancellation of the vibration of the specific frequency. Therefore, a partial or complete stop of the vibration occurs near the resonant frequency of the sheet part 10 and / or the resonating part 11, and as a result, a high sound-proofing performance that exceeds the mass law can be obtained while being relatively lightweight. A sound-proofing member that utilizes such a principle is called an acoustic metamaterial.

[0018] Also, the resonant frequency of the resonant portion 11 can be easily controlled by adjusting the spring constant by changing the shape, density distribution, or material (storage modulus, mass) of the resonant portion 11, or by changing the mass of the weight portion 22 shown in Fig. 3 described later. Furthermore, the frequency band (acoustic band gap width and frequency position) can also be controlled by the material, thickness, etc. of the sheet portion 10. Therefore, the above-mentioned sound-insulating structure 1 has a higher degree of freedom in selecting sound-insulating frequencies and a higher degree of freedom in design than conventional ones. Furthermore, because the sound-insulating member 12 has viscoelasticity, even if the adherend 13 has an uneven surface, such as a curved surface, the stretchable and flexible sheet portion 10 can follow the surface shape of the adherend 13, and as a result, the sheet portion 10 can be stably attached to the adherend 13. Therefore, the sound-insulating structure 1 according to this embodiment is easier to handle and more versatile than conventional ones.

[0019] Furthermore, when the sheet portion 10 and the resonating portion 11 are integrally formed, a plurality of resonating portions 11 (resonators) can be installed together, which significantly improves manufacturability and ease of handling. 12 and 13 described later, the protrusions are arranged with a maximum height higher than that of the resonating portion 11, so that even if the sound-insulating member 12 is wound into a sheet or multiple sheets are stacked in the manufacturing stage of the sound-insulating member 12, the protrusions function as spacers to prevent the resonating portion 11 from coming into contact with the rear surface of the sheet portion 10. This makes it easy to continuously produce and store the sound-insulating member 12 by so-called roll-to-roll without causing manufacturing troubles such as deformation, deviation, cracking, falling off, and breakage of the resonating portion 11, and improves the production speed, productivity, and economy compared to batch production by sheet. Furthermore, it is possible to mold the sheet portion and the resonating portion as a single unit, in which case there are no joint surfaces, and therefore it is possible to reduce the boundary surfaces that can become vulnerable to external forces such as vibration or changes in the external environment such as temperature and humidity, resulting in excellent durability.

[0020] Furthermore, by satisfying the following formula (1), the sound-insulating structure can achieve higher sound-insulating performance, specifically, the effect of preventing deviation from occurring in the frequency band in which the sound-insulating effect occurs. E_glue / I_glue>0.5×(E_membrane / H) (1) E_glue (MPa): Storage modulus of adhesive layer I_glue(mm): Average thickness of adhesive layer E_membrane(MPa): Storage modulus of the sheet and protrusions H(mm): Average height of sheet and protrusions

[0021] The sound insulation performance of the present invention can be described using a simple model consisting of a resonator with a spring portion as a unit as the operating principle as shown in Figure 5. The arrows in Figure 5 indicate the resonance direction. In Figure 5, the circles indicate weights that have the weight of the protrusions, the squares indicate adherends, the springs on the circle side indicate springs that correspond to the sheet portion and the protrusions, and the springs on the square side indicate adhesive. The spring constant of the sheet part and the protrusion part is K A , and the spring constant of the adhesive part is K BThe resonance phenomenon can be approximated by a series spring with the spring constant K A and glue layer The spring constant K B The combined spring constant K of the series springs ALL can be written as the following formula (S1). However, this formula is only for the case where the adhesive layer is sufficiently thin and its mass can be ignored. K ALL =1 / (1 / K A +1 / K B ) (S1)

[0022] The spring constant of the resin part in the seat component design is K A , the spring constant of the entire bonded structure is K ALL Therefore, |K A -K ALL A small | means that the deviation of the spring constant from the design is small. Furthermore, this value is used as the original spring constant, K A The value (normalized spring constant) divided by △K = |K A -K ALL | / K A Then, △K=1 / (1+(K B / K A )) and in order to reduce △K, A / K B It can be presumed that a preferable condition is that is greater than a certain value. In addition, if △K becomes smaller, the resonance frequency of the protrusion that directly corresponds to the sound insulation band becomes f=(K / m). 1 / 2 (m is the weight of the protruding part), so △f=(△K / m) 1 / 2 It can be seen that the deviation from the design frequency is also small.

[0023] In order to clarify the correspondence between the above simplified model, the convex shape, and the material properties, we assume that the protrusion is a rod-shaped spring with a constant cross-sectional area, such as a cylinder or a rectangular column, according to the model shown in Figure 6. In this case, the relationship between the load F and the extension L of the rod-shaped spring is expressed by the following formula (S2). The arrow in Figure 6 indicates the resonance direction. △F=(EA△L / L) (S2) E(MPa): Storage modulus A (mm 2 ): Cross-sectional area of ​​protrusion L(mm): Height of resin spring part △L(mm): Elongation when load F is applied In the above formula, the rod spring constant K is expressed as K=EA / L due to the relationship △F / △L=K. Therefore, K B / K A >β (β is a constant), then E B A B / L B >βE A A A / L A It can be written as follows.

[0024] Here, if the cross-sectional area of ​​the protrusion of the spring is constant, A A =A B Therefore, it can be deduced that it is preferable that the relationship between the storage modulus and the height or thickness of the resin part and the adhesive part ultimately satisfies the relationship represented by the following formula (S3). E B / L B >βE A / L A (S3)

[0025] The relationship of the above formula (S3) can be calculated and verified more precisely by calculation using the finite element method, and therefore, in the embodiment of the present invention, calculation using the finite element method is used. The inventors found that β≧0.5 is an important condition for suppressing the frequency deviation to 20% or less from the results of simulations using the finite element method. By using materials and adhesives and structures with shapes that satisfy this relationship, it is possible to provide high-quality products with small deviations from the sound insulation design frequency of the sheet portion.

[0026] When the above formula (1) is expressed as the following formula (1)', it is preferable that the above formula (1) satisfies formula (1)', and β in formula (1)' is not particularly limited as long as it is 0.5 or more, but from the viewpoint of suppressing a shift in the frequency band in which the sound insulation effect occurs, it is preferably 5, more preferably 50, and even more preferably 100, and while there is no particular upper limit required, it is usually 50,000 or less. E_glue / I_glue>β×(E_membrane / H) (1)' E_glue, I_glue, E_membrane, and H in the above formula (1)' are the same as E_glue, I_glue, E_membrane, and H in the above formula (1).

[0027] In this way, by making the storage modulus of the adhesive layer relative to its average thickness larger than the storage modulus of the sheet portion and the protrusions relative to their average heights by a certain amount, the vibration of the adherend is sufficiently transmitted to the sound-insulating material, and a sound-insulating effect can be obtained at the targeted frequency. When the storage modulus of the adhesive layer is small or the average thickness of the adhesive layer is large, i.e., when the left side of formula (1) is small, the movement of the adhesive layer due to the vibration of the adherend cannot be ignored, and as a result, it becomes difficult to obtain a sound-insulating effect at the targeted frequency. In addition, there are conventional techniques for using adhesives when installing sound insulation materials, such as those described in Patent Document 2, but the storage modulus of the adhesive layer is generally made small in order to cushion the impact. If the storage modulus of the adhesive layer is small, the left side of the equation becomes small, and it is generally difficult to obtain a sound insulation effect at a targeted frequency. Therefore, although it depends on the relationship with other values, when the storage modulus of the adhesive layer is greater than 10 MPa, it is easier to satisfy formula (1).

[0028] Each of the components, such as the sound insulation member, the adherend, and the adhesive layer, will be described in detail below. [Sound insulation materials] The sound-proofing member 12 has a sheet-like sheet portion 10 and a plurality of resonating portions 11 provided on one surface of the sheet portion. The sheet portion 10 and the resonator portion 11 may be made of the same material or different materials. They may be integrally formed, or may be combined after being formed separately.

[0029] (Storage modulus E_membrane) The storage elastic modulus (E_membrane) of the sheet portion 10 and the resonating portion 11 is not particularly limited as long as it satisfies the above-mentioned formula (1); however, from the viewpoint of obtaining high sound insulation performance, it is usually 0.5 MPa or more, preferably 1.0 MPa or more, more preferably 2.0 MPa or more, and even more preferably 3.0 MPa or more, and is usually 500 MPa or less, preferably 300 MPa or less, more preferably 200 MPa or less, and even more preferably 100 MPa or less.

[0030] The sheet portion 10 and the resonating portion 11 storage The elastic modulus (E_membrane) is the elastic modulus of the sheet 0 and the spring constant of the resonating portion 11. A method for calculating the composite storage elastic modulus will be described below. The spring constant (K_membrane) of the sheet portion 10 and the resonating portion 11 is The spring constant of the resonating part 11 is K_res, and the spring constant of the sheet part is K_s. If the spring constant is K_sheet, the composite value for each resonator is calculated from the following equation (S4): The spring constant (K_membrane) can be calculated. K_membrane=1 / (1 / K_res+1 / K_sheet) (S4) In this case, the composite storage modulus (E'_membrane e) can be obtained from the relationship expressed by the following formula (S5). It is also possible to measure each parameter separately, and finally combine them to calculate from the following formula (S5). The method of calculating res and K_sheet will be described later. K_membrane=E'_membrane×(A / H_membrane) (S5) E'_membrane: Storage modulus of each sheet and protrusion (together with each sheet) (Composite storage modulus of the member consisting of the vibration part) A: Cross-sectional area of ​​the protrusion (resonating part) H_membrane: The combined height of the sheet and resonator (H_res+H_sheet ) The final composite storage modulus (E_membrane) is calculated by The synthetic storage modulus (E'_membrane) of It is.

[0031] If the entire sheet portion 10 of the sound-proofing material is made of a single homogeneous material and has a uniform thickness, and all of the resonating portions 11 are made of the same material and have the same thickness, there is no need to calculate the composite spring constant for each resonating portion as described above, and the E'_membrane calculated from the composite spring constant for one arbitrarily selected resonating portion can be used as E_membrane. Furthermore, when the sheet portion 10 and the resonating portion 11 are made of the same material, the composite spring constant of any portion of either the sheet portion 10 or the resonating portion 11 can be set to K_membrane. The various storage elastic moduli described above can be measured by the methods described later. They may be directly evaluated using a material sampled from the sound-insulating member, or may be indirectly evaluated by preparing a test piece manufactured under the same manufacturing conditions.

[0032] When the sound-insulating member 12 has a weight portion 22 described later, the calculation of K_membrane does not take into account the storage modulus of the weight portion 22. This is because the weight portion is basically a rigid body, and therefore only the portions that impart flexibility affect the resonance in the present invention, that is, the sheet portion 10 and the base portion 21 described later.

[0033] The storage modulus can be controlled by changing the molecular weight of the resin or the type of bond, or by adding a filler, and generally increases with an increase in molecular weight, an increase in bond strength, or the addition of a filler. Furthermore, for example, when a molded product is produced by blending a resin having a low storage modulus with a resin having a high storage modulus, the storage modulus of the molded product can be controlled by adjusting the blend ratio of these resins.

[0034] The spring constant K_res of the resonating portion and the spring constant K_sheet of the sheet portion can be calculated from the storage elastic moduli of the resonating portion and the sheet portion, respectively, based on the following formulas (S6) and (S7). K_res = E_res × A_res / L_res (S6) K_sheet=E_sheet×A_sheet / L_sheet (S7) In the above formula, K_res (K_sheet): spring constant of the resonating part (sheet part) (-), E_res (E_sheet): storage modulus of the resonating part (sheet part) (MPa), A_res (A_sheet): cross-sectional area of ​​the resonating part (sheet part) (mm 2 ), L_res(L_sheet): Height of the resonating part (sheet part) (mm).

[0035] The storage modulus E_res and E_sheet of the sheet portion and the resonating portion in the above formulas (S6) and (S7) can be measured using an indentation hardness tester according to the following method. The storage modulus in this specification is measured under conditions of a temperature of 23°C and a humidity of 50% RH in the measurement atmosphere. The storage modulus of the adhesive layer can be measured by the method using an indentation hardness tester described below, but it may also be evaluated directly using a material collected from the sound-insulating structure, or indirectly using a test piece manufactured under the same manufacturing conditions. Measurements using an indentation hardness tester are performed in accordance with the international standard ISO 14577-1. Evaluations can be performed using a Vickers indenter.

[0036] Measurements using the indentation hardness tester give a load-displacement curve as shown in Figure 7. The symbols in the figure are as follows: F max : Maximum test force h r : Intersection of the tangent of the unloading curve and the indentation depth h f : Permanent indentation depth after removing the test force h max :F max Maximum indentation depth at Here, F max The ratio of the maximum indentation depth hmax to the permanent indentation depth after the test force is removed h f / hmax can be used as an index of the residual strain energy. E IT To analyze, the slope S of the tangent line drawn to the unloading curve is used. The composite elastic modulus Er of the indenter and the sample is expressed by the following formula (L).

[0037]

number

[0038] In addition, the indentation elastic modulus of the measurement object (E_res or E_sheet) is E IT Then, it is expressed by the following equation (M).

[0039]

number

[0040] (Height H) The height H of the sheet portion 10 and the resonating portion 11 is not particularly limited as long as it satisfies the above formula (1), but from the viewpoint of obtaining high sound insulation performance in the audible range, it is usually 0.5 mm or more, preferably 1.0 mm or more, more preferably 2.0 mm or more, and even more preferably 3.0 mm or more, and is usually 50.0 mm or less, preferably 30.0 mm or less, more preferably 25.0 mm or less, and even more preferably 20.0 mm or less. The height H of the sheet portion and the resonating portion is the combined height of the sheet portion 10 and the resonating portion 11. Specifically, if the height of each resonating portion is H_res and the thickness of the sheet portion directly below it is H_sheet, the combined height H' for each resonating portion is calculated from the following formula (B), and the height H is the average value of these combined heights. H'=H_res+H_sheet (B) In addition, when there is variation in height within one resonating portion, the average value is used.

[0041] If the thickness of the entire sheet portion of the sound-proofing material 12 is uniform and the heights of all the resonating parts are the same, there is no need to calculate the total height for each resonating part as described above, and the total height for one arbitrarily selected resonating part can be taken as H.

[0042] When the sound-proofing member 12 has a weight portion 22 described later, the height of the tip side of the weight portion 22 is not taken into consideration in calculating H. In other words, when the sound-proofing member 12 does not have a weight portion 22, H is the height from the bottom of the sheet portion 10 to the top of the resonating portion 11, and when the sound-proofing member 12 has a weight portion 22, H is the height from the bottom of the sheet portion to the bottom of the weight portion 22. This is because when the sound-proofing member 12 has a weight portion 22, the weight portion is made of a very hard material such as metal or ceramics, and is a rigid body with almost no stretch near the sound-proofing frequency. Therefore, it is the parts that have moderate stretch or distortion near the design frequency that affect the resonance. In other words, this is because only the sheet portion 10 and the base portion 21 described later exist.

[0043] [Seat section] There are no particular limitations on the sheet portion 10 so long as it is sheet-like and has appropriate elongation and distortion near the designed sound insulation frequency, and it may have either a flat or curved surface. When it is provided on an adherend, it can be appropriately selected to suit the shape of the adherend. In this specification, the term "sheet portion" refers to a sheet-like member that holds a convex portion on one side, and may be composed of one layer or two or more layers as described later. The sheet portion refers to the entire portion having a sheet shape. For example, as shown in FIG. 8, when the sheet portion is composed of a plurality of layers, and layer 10(b) composed of an adhesive for bonding two layers (10(a) and 10(c) in FIG. 8) is present among the layers, the sheet-shaped portion composed of layers 10(a), 10(b), and 10(c) becomes the sheet portion, and layer 14, which is a layer composed of an adhesive adjacent to the surface opposite the convex portion among the two surfaces of layer 10(c), which is the surface opposite the convex portion, becomes the adhesive layer in formula (1). In other words, in the case of FIG. 8, layer 10(a) does not become the entire sheet portion, and layer 10(b) does not become the adhesive layer in formula (1). Generally, the sound insulation design frequency is in the audible frequency range, which is 20 to 20000 Hz. As a sheet material having a suitable degree of elongation and distortion in this frequency range, polymeric materials such as resin and rubber are preferable. The sheet portion can also function as an oscillator (resonator) that vibrates at a certain frequency when sound waves are incident on the sheet portion from a noise source. The material constituting the sheet portion 10 preferably contains at least one selected from the group consisting of a thermosetting or photocurable elastomer and a thermoplastic elastomer. When casting using a metal mold, etc., it is necessary to fill the cavity on the surface of the mold with elastomer. Photocurable elastomers are preferred because they can fill the cavity in a relatively low-viscosity liquid state before curing, thereby increasing the filling rate.

[0044] Specific examples of materials constituting the sheet portion 10 include vulcanized thermosetting resin elastomers such as chemically crosslinked natural rubber or synthetic rubber, urethane thermosetting resin elastomers, silicone thermosetting resin elastomers, fluorine thermosetting resin elastomers, and acrylic thermosetting resin elastomers; Photocurable elastomers such as acrylic photocurable elastomers, silicone photocurable elastomers, and epoxy photocurable elastomers; Examples of the thermoplastic elastomer include olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, urethane-based thermoplastic elastomers, ester-based thermoplastic elastomers, amide-based thermoplastic elastomers, silicone-based thermoplastic elastomers, and acrylic-based thermoplastic elastomers. Further specific examples of the heat- or light-curable elastomer and the thermoplastic elastomer include rubber. Specific examples include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof, but are not limited thereto. These may be used alone or in combination of two or more. Among these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, and silicone rubber, acrylic rubber, and modified products thereof are more preferred. By using these materials, there is a tendency for heat resistance and cold resistance to be excellent.

[0045] The sheet member 10 may contain various additives such as a flame retardant, an antioxidant, a plasticizer, a colorant, and the like. Flame retardants are additives that are blended to make flammable materials less flammable or to prevent them from catching fire. Specific examples of flame retardants include, but are not limited to, bromine compounds such as pentabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, tetrabromobisphenol A, hexabromocyclododecane, and hexabromobenzene, phosphorus compounds such as triphenyl phosphate, chlorine compounds such as chlorinated paraffin, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, and boron compounds such as sodium borate. The antioxidant is an additive that is blended to prevent oxidative deterioration. Specific examples thereof include, but are not limited to, phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. Furthermore, the plasticizer is an additive that is blended to improve flexibility and weather resistance, and specific examples thereof include, but are not limited to, phthalic acid esters, adipic acid esters, trimellitic acid esters, polyesters, phosphate esters, citrate esters, sebacic acid esters, azelaic acid esters, maleic acid esters, silicone oils, mineral oils, vegetable oils, and modified products thereof. Furthermore, examples of colorants include dyes and pigments. These may be used alone or in combination of two or more.

[0046] In Fig. 1, the sheet part 10 is formed in a square shape in a plan view, but the shape is not particularly limited to this. Any shape in a plan view can be adopted, such as a triangular shape, a rectangular shape, a rectangular shape, a trapezoidal shape, a diamond shape, a polygonal shape such as a pentagonal shape or a hexagonal shape, a circular shape, an elliptical shape, or an irregular shape not classified into the above. Note that the sheet part 10 may have cuts or punched holes at any position from the viewpoint of improving the stretching performance and reducing the weight, as long as the characteristics as an acoustic metamaterial are not lost.

[0047] The thickness (H_sheet) of the sheet portion 10 is not particularly limited as long as the height H of the sheet portion and the convex portion is within a range that satisfies the above formula (1). Since the frequency band (acoustic band gap width and frequency position) at which high sound insulation performance is exhibited can be controlled by the thickness of the sheet portion 10, the thickness of the sheet portion 10 can be appropriately set so that the acoustic band gap matches the desired sound insulation frequency range. If the sheet portion 10 is thick, the acoustic band gap width tends to be narrower and shifted to the lower frequency side. On the other hand, if the sheet portion 10 is thin, the acoustic band gap width tends to be wider and shifted to the higher frequency side. From the viewpoints of sound insulation performance, mechanical strength, flexibility, handling, etc., the thickness H_sheet of the sheet part 10 is preferably 10 μm or more, more preferably 50 μm or more, and even more preferably 100 μm or more. The thickness of the sheet part 10 is preferably 2 mm or less, more preferably 1 mm or less, and even more preferably 500 μm or less.

[0048] Moreover, from the viewpoint of reducing the temperature dependency of sound insulation at low temperatures, the sheet part 10 preferably has a glass transition temperature of 0°C or lower. The lower the glass transition temperature of the sheet part 10, the higher the cold resistance is, and the smaller the temperature dependency of the storage modulus around 0°C tends to make the sound insulation performance less dependent on the environmental temperature. It is more preferably -10°C or lower, even more preferably -20°C or lower, and particularly preferably -30°C or lower. In this specification, the glass transition temperature of the sheet part 10 means the peak temperature of the loss tangent in the dynamic viscoelasticity measurement at a frequency of 10 Hz described above, particularly in the temperature dependency measurement.

[0049] The sheet portion may be composed of two or more layers, and the sheets may be bonded to each other by an adhesive layer. Between The adhesive layer formed in the sheet portion can be considered as one layer in the sheet portion. For example, if sheet portion X and sheet portion Y are formed with adhesive layer Z sandwiched between them, the composite spring constant of the entire sheet portion consisting of a total of three layers can be considered and expressed by the following formula. However, the following formula applies when each layer is sufficiently thin compared to the protrusion and its mass can be ignored. K Sheet =1 / (1 / K X +1 / (1 / K Z +1 / K Y )) L Sheet =L X +L Y +L Z In the above formula, K Sheet (-): Composite spring constant of the entire seat, K X , K Y (-): Spring constant of seat part X, Y, K Z (-): Spring constant of adhesive layer Z, L sheet (mm): Total seat height, L X , L Y (mm): Height of seat part X, seat part Y, L Z (mm): indicates the height of the adhesive layer Z. From the storage modulus and layer thickness of each of the three layers, the relationship between each parameter can be obtained in the same way as in the discussion of the composite spring constant of the protrusions and sheet portion. That is, the storage modulus of the entire sheet portion can be calculated based on the following formula. K Sheet =E Sheet x A / L Sheet In the above formula, A represents the cross-sectional area of ​​the entire sheet. Sheet Using these, we can calculate K_membrane and E_membrane for a member consisting of a sheet section and a resonator section. In general, the same applies to the case of four or more layers. In addition, when there are two or more layers, they may be combined by hardening a thermosetting elastomer, a photocurable elastomer, etc. on a separately prepared sheet section without using adhesive.

[0050] In this specification, when a sheet has two or more layers, the layer that is farthest from the convex portions, i.e., the layer opposite the layer having the convex portions, may be referred to as the "support." The above-mentioned support that supports the convex portion and other sheet portions is not particularly limited, but its material is preferably polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyvinyl chloride, polyvinylidene chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polystyrene, cyclic polyolefin, polynorbornene, polyethersulfone, polyetheretherketone, polyphenylene sulfide, polyarylate, polycarbonate, polyamide, polyimide, triacetyl cellulose, polystyrene, epoxy resin, acrylic resin, oxazine resin, and other organic materials, and composite materials containing metals such as aluminum, stainless steel, iron, copper, zinc, and brass, inorganic glass, inorganic particles, and fibers in these organic materials. Among these, from the viewpoints of sound insulation, rigidity, moldability, cost, and the like, the support is preferably at least one selected from the group consisting of a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, and an alloy plate. Here, the thickness of the support is not particularly limited, but from the viewpoints of sound insulation performance, rigidity, moldability, weight reduction, cost, etc., it is usually preferable that the thickness is 0.1 mm or more and 50 mm or less.

[0051] [Convex part (resonating part)] There are no particular limitations on the number of protrusions (resonating portions) 11 provided on one surface of the sheet portion 10, as long as the protrusions have appropriate elongation and distortion in the vicinity of the designed sound insulation frequency. The resonating portions 11 function as an oscillator (resonator) that vibrates at a certain frequency when sound waves are incident from a noise source. The arrangement, number of the resonating parts 11, size, etc. can be appropriately set according to the desired performance, and are not particularly limited. The resonating parts 11 are provided in contact with one sheet surface of the sheet part 10. For example, in FIG. 1, the multiple resonating parts 11 are arranged at equal intervals in a lattice shape, but the arrangement of the resonating parts 11 is not particularly limited to this. For example, the multiple resonating parts 11 may be arranged in a staggered shape or randomly. Since the sound insulation mechanism using the sound insulation member according to this embodiment does not use Bragg scattering like so-called phononic crystals, the resonating parts 11 do not necessarily have to be arranged at regular and periodic intervals.

[0052] The material constituting the resonator portion 11 is not particularly limited, and the conditions thereof are the same as the conditions for the material of the above-mentioned sheet portion 10. From the viewpoints of product cost and ease of manufacture, it is preferable that the material of the resonator portion 11 and the material of the sheet portion 10 are the same.

[0053] The number of resonating portions 11 provided per unit area is not particularly limited as long as the resonating portions 11 can be arranged so as not to come into contact with each other and thereby not to interfere with each other. The maximum number of resonating parts 11 per unit area varies depending on the shape of the resonating parts 11, but for example, if the resonating parts 11 are cylindrical, the height direction of the cylinder is parallel to the sheet normal direction, and the cross-sectional diameter of the cylinder is 1 cm, the maximum number of resonating parts 11 per unit area is 10 cm. 2 Preferably 100 or less per unit. The minimum number of resonating parts 11 per unit area is, for example, 10 cm when the resonating parts 11 are cylindrical, the height direction of the cylinder is parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm. 2 The number of resonating parts 11 is preferably 2 or more, more preferably 10 or more, and even more preferably 50 or more per unit area. When the number of resonating parts 11 is equal to or more than the above-mentioned preferable lower limit, higher sound insulation performance tends to be obtained. When the number is equal to or less than the above-mentioned preferable upper limit, it becomes easier to reduce the weight of the entire seat.

[0054] The height H_res of the resonating portion 11 in the normal direction of the sheet portion 10 is not particularly limited as long as the height H of the sheet portion and the convex portion is within a range that satisfies the above formula (1). From the viewpoint of ease of molding and improvement of productivity, the height H_res is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. Also, it is preferably 20 mm or less, more preferably 15 mm or less, even more preferably 10 mm or less, even more preferably 8 mm or less, still more preferably 5 mm or less, and particularly preferably 3 mm or less. By setting it within the above preferred numerical range, it becomes easy to wind up or stack the sheet portion 10 provided with the resonating portion 11 (i.e., the sound insulation member 12), so that the sound insulation member can be manufactured by so-called roll-to-roll and stored in a rolled form, which tends to improve productivity and economy. Furthermore, the height of the resonating parts 11 in the normal direction of the sheet part 10 does not have to be the same for all of the resonating parts, and may be different. Different heights of the resonating parts may have an effect of expanding the frequency range in which sound insulation performance is exhibited. In this case, the height H is the average value of the heights of the multiple resonating parts, as described above.

[0055] 3, the resonator 11 may be configured as a composite structure including a base 21 and a weight 22 supported by the base 21 and having a larger mass than the base 21. The resonator 11 is configured by a mass of the weight 22 acting as a weight and a base acting as a spring. 21 The base and the weight effectively function as a resonator having a resonance frequency determined by the spring constant of the base. The base and the weight will be described in detail below.

[0056] (base) A plurality of bases 21 are provided on the sheet surface of the sheet portion 10 in contact with each other. The external shape of the base 21 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical shape, an elliptical prism, a truncated pyramid shape, a truncated cone shape, a pyramid shape, a cone shape, a hollow cylinder shape, a branched shape, or an indefinite shape not classified among the above. The base 21 can also be formed into a cylindrical shape having a different cross-sectional area and / or cross-sectional shape depending on the height position. Furthermore, the shape and height of the multiple bases 21 provided in contact with the sheet surface may be the same or different.

[0057] The material of the base 21 is not particularly limited as long as it satisfies the above required characteristics. For example, it may be a resin material, and may be at least one selected from the group consisting of a thermosetting or photosetting elastomer, a thermoplastic elastomer, a thermosetting or photosetting resin, and a thermoplastic resin. As the conditions for the thermosetting or photosetting elastomer and the thermoplastic elastomer, the conditions exemplified in the explanation of the sheet portion 10 can be applied. From the standpoint of product cost and ease of manufacture, it is preferable that the material of the base portion 21 and the material of the sheet portion 10 are the same. Examples of the heat- or light-curable resin include acrylic thermosetting resin, urethane thermosetting resin, silicone thermosetting resin, epoxy thermosetting resin, etc. Examples of the thermoplastic resin include polyolefin thermoplastic resin, polyester thermoplastic resin, acrylic thermoplastic resin, urethane thermoplastic resin, polycarbonate thermoplastic resin, etc. Specific examples include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified versions thereof; and polymers such as polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, and oxazine resin, but are not limited thereto. These may be used alone or in combination of two or more. The base 21 may also be a porous body containing pores (gas such as air) in these resin materials. Furthermore, the base 21 may contain a liquid material such as mineral oil, vegetable oil, silicone oil, etc. When the base 21 contains a liquid material, it is desirable to seal the liquid material in the resin material from the viewpoint of preventing the liquid material from leaking out to the outside.

[0058] Among these, the material of the base 21 is preferably the same as that of the above-mentioned sheet portion 10, and elastomers are particularly preferred. If the sheet portion 10 and the base 21 contain the same elastomers, the sheet portion 10 and the base 21 can be easily molded integrally, and productivity can be dramatically improved. In other words, one particularly preferred embodiment is that the sheet portion 10 and the resonator portion 11 (base 21) are an integrally molded product that both contain at least one type selected from the group consisting of a thermo- or photo-curable elastomer and a thermoplastic elastomer. Specific examples of elastomers include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber and modified products thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, oxazine resin, and the like, but are not particularly limited thereto. Of these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, and from the viewpoint of excellent heat resistance and cold resistance, silicone rubber, acrylic rubber, and modified products thereof are more preferred.

[0059] The base 21 may be a two-color molded body or a multi-color molded body made of two or more kinds of resin materials. In this case, by using the same material as the sheet part 10 for the side of the base 21 that contacts the sheet part 10, the sheet part 10 and the base 21 can be easily molded together as one piece.

[0060] When a resonating portion 11 (base portion 21) having a circular cross section is provided, in a cross section parallel to the sheet surface of the sheet portion 10 at a height position of the resonating portion 11 (base portion 21) where the sum of the cross-sectional areas of the multiple resonating portions 11 (base portions 21) is maximum, the diameter of the circle with the largest diameter among the circles (circular cross sections) included in the cross section is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less. In addition, the diameter of the circle with the smallest diameter is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the number of resonating portions 11 (base portions 21) to be provided on the sheet surface of the sheet portion 10 within the above preferred numerical range, a predetermined number or more of resonating portions 11 (base portions 21) can be secured, better sound insulation performance can be obtained, and ease of molding and productivity tend to be further improved.

[0061] (weight) The weights 22 (also simply referred to as "weights") are not particularly limited as long as they are provided on the bases 21 and have a mass larger than that of the bases 21. The weights 22 may be provided on the bases 21 as shown in FIG. 3, but may be provided so that a part of them is embedded in the bases 21. From the viewpoint of preventing the weights 22 from falling during manufacturing, it is preferable that at least a part of the weights 22 is embedded in the bases 21, and in particular, it is preferable that the weights 22 are entirely embedded in the bases 21 as shown in FIG. 9. FIGS. 4 and 10 are cross-sectional views taken along the line III-III in FIG. 3 and the line IV-IV in FIG. 9, respectively. Furthermore, from the viewpoint of reducing the height and weight of the sound insulation member 12 or improving the sound insulation performance, it is preferable to arrange the bases 21 and the weights 22 so that the center of gravity (center of mass) of the resonator 11 is located at least closer to the tip side than the center of the resonator 11 in the height direction. Moreover, from the viewpoint of preventing weight portion 22 from falling during the manufacture of the sound-proofing member, it is preferable that a single weight portion 22 (weight portion 22 made of a single member) is provided for each base portion.

[0062] The material constituting the weight portion 22 may be appropriately selected in consideration of mass, cost, etc., and the type is not particularly limited. From the viewpoint of miniaturizing the sound insulation member 12 and improving the sound insulation performance, the material constituting the weight portion 22 is preferably a material with a high specific gravity. Specific examples include, but are not limited to, metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, brass, etc.; inorganic glasses such as soda glass, quartz glass, lead glass, etc.; and composites containing powders of these metals or alloys or these inorganic glasses in the resin material of the base 21. The material, mass, and specific gravity of the weight 22 may be determined so that the acoustic band gap of the sound-insulating member 12 matches the desired sound-insulating frequency range. Among these, at least one selected from the group consisting of metals, alloys, and inorganic glass is preferred from the viewpoints of low cost, high specific gravity, etc. The specific gravity means the ratio of the mass of the material to the mass of the same volume of pure water at 4°C under a pressure of 1013.25 hPa, and in this specification, the value measured according to JIS K 0061 "Method of measuring density and specific gravity of chemical products" is used.

[0063] The storage modulus of the weight is usually 1000 MPa or more from the viewpoint of improving sound insulation performance, and 200 0M The storage modulus of the weight portion is preferably 1,000,000 MPa or more, more preferably 5,000 MPa or more, and even more preferably 10,000 MPa or more, and is usually 1,000,000 MPa or less, preferably 800,000 MPa or less, more preferably 600,000 MPa or less, and even more preferably 500,000 MPa or less. The storage modulus of the weight portion can be measured by the same method as the method for measuring the storage modulus of the sheet portion and the protrusions described above.

[0064] The volume ratio of the weight portion in the resonator portion 11 is not particularly limited, but from the viewpoint of improving sound insulation performance, it is usually 1 volume % or more, preferably 5 volume % or more, more preferably 10 volume % or more, and even more preferably 20 volume % or more, relative to 100 volume % of the resonator portion, and is usually 90 volume % or less, preferably 80 volume % or less, more preferably 70 volume % or less, and even more preferably 50 volume % or less.

[0065] Weight portion 22 may have a through hole. Weight portion 22 having a through hole will be described with reference to the drawings. Fig. 11(a) shows a resonating portion including base portion 21 and weight portion 22, and Fig. 11(b) shows weight portion 22. In the present invention, a weight having a through hole refers to one having a through hole as shown in Fig. 11(b), for example, and examples of the shape include a donut shape, a washer shape, and a nut shape. The shape of the weight portion 22 is not particularly limited, but a plate-like weight is preferable from the viewpoint of adjusting the sound insulation performance and making the weight portion 22 thinner. By making the weight portion 22 plate-like, the center of gravity of the weight portion 22 can be located farther from the sheet portion 10 than when the weight portion 22 is a sphere or the like, and the vibration moment of the resonator 11 tends to be larger. For example, when the acoustic band gap width is constant, the plate-like weight portion 22 can be made thinner than when the weight portion 22 is a sphere or the like. On the other hand, when the height of the weight portion 22 is constant, the plate-like weight can obtain a wider band gap width than when the weight portion 22 is a sphere or the like.

[0066] In Fig. 11(a), the weight 22 is formed in a substantially circular shape with an outer diameter smaller than that of the base 21, and is embedded in the base 21 at the tip side of the resonator 11. Since the weight 22, which acts as a weight of the resonator, is supported by the base 21, which determines the spring constant, the resonant frequency of the resonator 11 can be easily controlled, for example, by adjusting the spring constant by changing the shape or material (storage modulus, mass) of the base 21 or by changing the mass of the weight 22. In general, when the storage modulus of the base 21 decreases, the acoustic band gap tends to shift to the lower frequency side. Also, when the mass of the weight 22 increases, the acoustic band gap tends to shift to the lower frequency side.

[0067] In FIG. 11(b), hx represents the height of the weight, r1 represents the outer diameter of the weight, and r2 represents the diameter (inner diameter) of the through hole. The height (hx) of weight portion 22 is not particularly limited, but when the height of resonator portion 11 is taken as 1, it is preferably 0.95 or less, and more preferably 0.9 or less. Also, it is preferably 0.2 or more, and more preferably 0.3 or more. By keeping it within these ranges, it tends to be possible to obtain a wide sound insulation bandwidth while suppressing the height of the sound insulation sheet member. The outer diameter (r1) of the weight portion 22 is not particularly limited. When the base portion 21 has a circular cross section, a diameter of the circular cross section tends to provide excellent sound insulation performance. Although not particularly limited, the maximum value of r1 is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less. The minimum value of r1 is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By keeping the value within the above preferred numerical range, good sound insulation performance can be obtained, and the ease of molding and productivity also tend to be further improved. Plummet 22 may be embedded or exposed in base 21. In weight 22 having a through hole, the through hole of weight 22 is filled with a resin material or the like, and this portion also serves as a fixed end to base 21. Therefore, even if exposed, falling off or breaking of weight 22 can be suppressed.

[0068] The inner diameter (r2) of the weight portion 22 is not particularly limited. As long as it is smaller than the outer diameter (r1), there is no particular limitation, but the maximum value of r2 is preferably 90 mm or less, more preferably 40 mm or less, even more preferably 20 mm or less, and particularly preferably 10 mm or less. The minimum value of r2 is preferably 2 μm or more, more preferably 50 μm or more, and even more preferably 80 μm or more. By keeping it within the above preferred numerical range, it tends to be easier to fill the through-hole with a resin material or the like. Furthermore, the ratio of the outer diameter to the inner diameter of weight portion 22 is not particularly limited.

[0069] The surface of the weight portion 22 (including the through hole) is provided with a suitable sex In order to increase the strength of the member, a surface treatment may be applied. For example, chemical treatment with a solvent or the like to improve adhesion to the base 21, or physical treatment to increase the strength of the member by providing irregularities on the surface, are possible. The treatment method is not particularly limited.

[0070] [Protrusion] The sound-proofing member 12 may have other protrusions on one surface of the sheet portion (the surface on which the convex portion is provided) in addition to the resonator 11. For example, the sound-proofing member 12 may have rib-shaped protrusions 31 shown in Fig. 12 or columnar protrusions such as cylindrical protrusions 32 shown in Fig. 13. As described above, the protrusions are included in the concept of convex portions, and therefore, in order to clearly indicate this, the protrusions are represented as "31(11)" and "32(11)" in Figs. 12 and 13. The shape and installation position of the protrusion are not particularly limited as long as they are installed so as not to interfere with the resonating unit 11 that functions as a resonator. For example, the external shape of the protrusion is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical prism, an elliptical prism, a truncated pyramid, a truncated cone, a pyramid, a cone, a hollow cylinder, or an indefinite shape not classified as above. In addition, the protrusion can be formed into a columnar shape having a different cross-sectional area and / or cross-sectional shape depending on the height position. In addition, the maximum length of the protrusion in the length direction of the sheet part 10 is not particularly limited as long as it is equal to or less than the maximum length of the sheet in the MD direction.

[0071] The shape of the protrusions is not particularly limited, and when they function as a spacer, they may be higher than the maximum height H_res of the resonator 11. When they function as a vibrator, the positions, number and height of the protrusions can be adjusted according to the frequency range to be adjusted. The maximum height H_rib of the protrusions is not particularly limited as long as it is greater than the maximum height H_res of the resonator section 11. From the viewpoints of ease of molding and improvement of productivity, the maximum height H_rib is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. The maximum height H_rib is preferably 20 mm or less, more preferably 15 mm or less, even more preferably 10 mm or less, even more preferably 5 mm or less, and particularly preferably 3 mm or less.

[0072] The rib-shaped protrusions 31 will be described below, but protrusions of other shapes, such as cylindrical protrusions 32, can also be designed in the same way within the applicable range. The rib-shaped protrusions 31 are each formed into a generally plate-like shape so as to extend in the length direction (sheet flow direction, MD) of the sheet part 10. The rib-shaped protrusions 31 are provided on the sheet surface of the sheet part 10, more specifically, at two locations on the edge of the sheet part 10 in the width direction (direction perpendicular to the sheet flow direction, TD).

[0073] The rib-shaped protrusions 31 have a maximum height H_rib that is higher than the maximum height H_res of the resonating portion 11 in the normal direction of the sheet portion 10. As a result, even if the sound-insulating member 12 is wound into a sheet or multiple sheets are stacked together during production, the rib-shaped protrusions 31 function as spacers, so that the contact of the resonating portion 11 with the rear surface of the sheet portion 10 is suppressed. Therefore, the provision of the rib-shaped protrusions 31 makes it easy to produce and store the sound-insulating member 12 by a so-called roll-to-roll method without causing production troubles such as deformation, deviation, cracking, falling off, and breakage of the resonating portion 11. The rib-shaped protrusions 31 can also function as an oscillator (resonator) that vibrates at a certain frequency when sound waves are incident from a noise source.

[0074] 12 employs a pair of rib-like protrusions 31 extending in the longitudinal direction of the sheet portion 10, but multiple rib-like protrusions 31 having a shorter maximum length may be spaced apart along the longitudinal direction of the sheet portion 10. In this case, the spacing between each of the rib-like protrusions 31 may be periodic or random. When multiple rib-like protrusions 31 are spaced apart in this manner, the distance between each of the rib-like protrusions 31 is not particularly limited, but is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less.

[0075] The material constituting the rib-shaped protrusions 31 is not particularly limited, but is preferably the same resin material as the sheet portion 10 and / or the resonating portion 11 (base portion 21), and more preferably the same elastomers as the sheet portion 10 and the resonating portion 11 (base portion 21). If the same resin material as the sheet portion 10 and / or the base portion 21 is used, it becomes easy to integrally mold the sheet portion 10 and / or the resonating portion 11 (base portion 21), and productivity is dramatically improved.

[0076] The protrusion 31 is a protrusion like the resonator, and therefore acts in the same manner as the resonator. In this case, when calculating E_membrane in the above formula (1), conversion is performed by replacing E_res with the storage elastic modulus E_rib of the protrusion 31 and H_res with H_rib, etc., to obtain the above-mentioned The combined storage modulus (E') for each protrusion 31 is calculated using the formulas (S4) to (S6) and the like. The weighted average of the storage elastic modulus of all the protrusions on the sheet surface is calculated using the number of protrusions as a weight together with the multiple resonating parts 11, and this average is called E_membr Let's call it ane. In addition, when calculating the height H of the sheet portion and the protrusion, the protrusion is considered as a collection of multiple protrusions and H_membrane is calculated. However, when a rib-shaped protrusion as shown in FIG. 12 is used, the resonance Since the areas of the bottom surfaces (surfaces where the convex parts contact the sheet part) of the protrusions and the rib-shaped protrusions are different, first replace H_res with H_rib and use the above formula (B) to find the total height (H') for each protrusion 31. Next, a weighted average is calculated for all protrusions present on the sheet surface, including the above-mentioned multiple resonating parts 11, with the area of ​​the protrusion bottom surface being used as the weight, and this weighted average is designated as H_membrane. The method of calculating the height when a component is present is similarly applied to the case where there are multiple types of resonating parts. Similarly, in the case of using a cylindrical protrusion having the same area as the resonating portion and the bottom surface as shown in FIG. 13, H_res is replaced with H_rib, and the total height (H') for each protrusion 31 is calculated using the above formula (B), and then the weighted average of the total height for the multiple resonating portions 11 is calculated using the area of ​​the bottom surface of each protrusion as a weight. value The weighted average value is defined as H_membrane.

[0077] [Adhesive layer] There are no particular limitations on the adhesive layer, so long as it is provided on the surface of the sheet portion opposite the side on which the convex portion is provided. In particular, it is preferable for the adhesive layer to adhere the above-mentioned sound-proofing member to an adherend (such as a product or part to be sound-proofed) described below. layer The method of adhering the sound-proofing member to the adherend via the adhesive is not particularly limited, and examples thereof include a method of heating and pressing or pressing each separately molded part to bond them together, a method of bonding using various known adhesives, and a method of joining them by heat welding, ultrasonic welding, laser welding, etc. However, in the method of heating and pressing the sheet or pressing the sheet to bond them together during bonding, since the sound-proofing member has unevenness on its surface, it is difficult to obtain a uniform and sufficient adhesive strength on the bonding surface. In addition, in the method of heat welding or ultrasonic welding, the sheet melts and deforms, and this deformation during bonding is likely to cause deviation from the originally designed sound insulation / vibration damping frequency. Therefore, it is particularly effective to use an adhesive to bond and install the sound-proofing member. In addition, the sound-insulating structure according to this embodiment includes a configuration in which an adhesive layer is provided all over the space between the adherend and the sheet portion, as well as a configuration in which no adhesive layer is provided in a portion between the adherend and the sheet portion.

[0078] In order to achieve sufficient sound insulation performance, adhesive layer Thinner film thickness and adhesive layer It is preferable to control the storage elastic modulus of the sheet portion and the protrusions so that the ratio of the storage elastic modulus of the sheet portion and the protrusions falls within a certain range as shown in the following formulas (2) and (3). 7000≧E_glue / E_membrane≧0.5 (2) 50.0≧E_glue / E_adh≧0.00002 (3) E_glue (MPa): Storage modulus of adhesive layer E_membrane(MPa):Sheet Parts and protrusions Storage modulus of E_adh(MPa): Storage modulus of adherend

[0079] The above formula (2) indicates that the storage modulus of the sheet portion, which is the layer adjacent to the adhesive layer, is within a certain ratio to the storage modulus of the adhesive layer. When this value is within the range, reflection of elastic waves at the interface is unlikely to occur, and vibration energy is easily transmitted to the resonating portion, which tends to improve sound insulation performance. In particular, when E_glue / E_membrane=1, there is no reflection of elastic waves at the interface, so there is no energy loss. In addition, there is a low possibility of peeling at the interface due to differences in the amount of elongation and distortion during vibration caused by differences in the storage modulus of the adjacent layers, which is also favorable for the durability of the product. Similarly, the above formula (3) indicates that the storage modulus of the adherend, which is the layer adjacent to the adhesive layer, is within a certain ratio to the storage modulus of the adhesive layer, and when this value is within the range, reflection of elastic waves at the interface is unlikely to occur, and vibration energy is easily transmitted to the resonating part, so sound insulation performance tends to improve. In particular, when E_glue / E_adh=1, there is no reflection of elastic waves at the interface, so there is no energy loss. In addition, the difference in the storage modulus of the adjacent layers reduces the possibility of peeling at the interface due to differences in the amount of elongation and strain during vibration, which is also favorable for the durability of the product.

[0080] The average film thickness I_glue of the adhesive layer is not particularly limited, but is preferably thinner from the viewpoints of vibration energy transmission and material costs, and preferably satisfies the following formula (4). 1.0≧I_glue≧0.005 (4) Furthermore, I_glue is more preferably 0.01 mm or more, even more preferably 0.02 mm or more, and particularly preferably 0.05 mm or more, and is preferably 0.8 mm or less, more preferably 0.5 mm or less, even more preferably 0.3 mm or less, and particularly preferably 0.25 mm or less.

[0081] The storage modulus of the adhesive layer is not particularly limited, but is usually 0.1 MPa or more, preferably 1 MPa or more, more preferably 10 MPa or more, and even more preferably 50 MPa or more. Also, it is usually 10000 MPa or less, preferably 5000 MPa or less, more preferably 3000 MPa or less, and even more preferably 1000 MPa or less. If it exceeds the above range, the brittleness increases, and the adhesive layer is prone to cracking and peeling, and if it is below the above range, the adhesive strength and peel strength themselves are reduced. Therefore, it is preferable to set it to a range of more than 10 MPa and 10000 MPa or less. The storage modulus of the adhesive layer can be measured by the same method as the method for measuring the storage modulus of the sheet part and the protrusions described above.

[0082] The sound insulation structure according to another embodiment of the present invention satisfies the requirement of formula (1) in the sound insulation structure described above by using the above adhesive. layer Specifically, the sound-insulating structure has a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion, and an adhesive layer, and the elastic modulus of the adhesive layer is greater than 10 MPa. However, it is preferable that this sound insulation structure satisfies the requirement of the above formula (1), and the conditions other than the above formula (1) can be the same as those for the above-mentioned sound insulation structure.

[0083] Controlling the mechanical properties of adhesives, including the storage modulus, can be considered to be similar to controlling the mechanical properties of polymeric materials, since adhesives are also a type of polymer. In other words, the mechanical properties of polymeric materials, including adhesives, depend on the chemical structure of the polymer chain, the molecular weight and molecular weight distribution of the polymer chain, the crosslinking structure and crosslinking density between the polymer chains, and the added filler. In particular, the storage modulus of resins can be adjusted by adjusting the crystallinity of the polymer. Common methods for increasing the degree of crystallinity include introducing a conjugated structure into the main chain structure to increase the rigidity of the molecule, controlling the polymerization reaction by reaction conditions and catalysts to reduce branching of the polymer chain, introducing heteroatoms or hydrogen bond sites into the polymer chain to strengthen intermolecular interactions, and slowing down the rate of precipitation from the polymer solution. In addition to adjusting the degree of crystallinity, the introduction of additives is also effective in adjusting the storage modulus of resins. For example, it is possible to lower the storage modulus by introducing a plasticizer to weaken the intermolecular interactions, and it is possible to increase the storage modulus by compounding glass fibers, carbon fibers, layered clay minerals, metal oxides, metals, etc., which have high storage modulus. In addition, the storage modulus of crosslinked polymers such as elastomers can be adjusted by adjusting the crosslinking density by adjusting the amount of crosslinking agent or reaction rate. In general, lowering the crosslinking density lengthens the molecular chain between crosslinking points, making it easier to extend, thereby lowering the storage modulus, while increasing the crosslinking density shortens the molecular chain between crosslinking points, making it harder to extend, thereby raising the storage modulus. In addition, it is also possible to adjust the storage modulus by compounding fine particles made of a material with a high storage modulus, such as carbon black, silica, or carbon nanotubes, as a filler and adjusting the size, amount, dispersibility, etc. of the filler.

[0084] There are no particular restrictions on the loss modulus of the resin part or the residual strain under load, but since the resonance of the resonating part is utilized, it is preferable that the loss modulus of elasticity and the residual strain are small. That is, in this measurement method, the maximum indentation depth h of the sound-insulating material forming the sheet part and the resonating part using an indentation type microhardness tester is max , and the displacement at unloading h f For 0.5 ≧ h f / h max It is preferred that it is ≧0.0.

[0085] The material of the adhesive layer is not particularly limited as long as it satisfies the above formula (1), but it is preferable to select it within the range that satisfies the above formulas (2) and (3). For example, silicone-based resin, epoxy-based resin, cyanoacrylate-based resin, vinyl acetate-based resin, polyvinyl acetal-based resin, ethylene vinyl acetate-based resin, vinyl chloride-based resin, acrylic-based resin, polyamide-based resin, cellulose-based resin, olefin-based resin, polyvinyl butyral-based resin, urea-based resin, melamine-based resin, phenol-based resin, resorcinol-based resin, epoxy-based resin, polyester-based resin, polyurethane-based resin, polyaromatic-based resin, chloroprene-based rubber, nitrile-based rubber, styrene butadiene-based rubber, polysulfide-based rubber, butyl-based rubber, silicone-based rubber, acrylic-based rubber, modified silicone-based rubber, urethane-based rubber, silylated urethane-based resin, telechelic polyacrylate-based adhesive, and mixtures thereof can be mentioned. Among these, from the viewpoint of achieving a balance between adhesion, peel durability, impact resistance, heat resistance, and chemical resistance, it is preferable to use one or more resins selected from the group consisting of silicone-based resins, epoxy-based resins, cyanoacrylate-based resins, acrylic-based resins, and urethane-based resins, and it is particularly preferable to use one or more resins selected from the group consisting of silicone-based resins, epoxy-based resins, and cyanoacrylate-based resins. The total content of the above materials in the adhesive layer is not particularly limited, but from the viewpoints of appropriate application viscosity and appropriate curing speed, it is usually 10% by weight or more, preferably 20% by weight or more, more preferably 25% by weight or more, and even more preferably 30% by weight or more, and although there is no particularly preferred upper limit, it is usually 90% by weight or less.

[0086] Specific examples of adhesives that can be used in the adhesive layer include, as acrylic resin-based adhesives, OP-1030M manufactured by Denka Co., Ltd., OP-1505 manufactured by Denka Co., Ltd., OP-3010P manufactured by Denka Co., Ltd., the composition described in WO2011 / 046120, which is a known composition, and the composition described in JP2013-112766, which is a known composition, and as epoxy resin-based adhesives, AY-5302 manufactured by Alteco Co., Ltd., AY-5231 manufactured by Alteco Co., Ltd., AY-5274 manufactured by Alteco Co., Ltd., AY-5011 manufactured by Alteco Co., Ltd., AY-5012 manufactured by Alteco Co., Ltd., AY-5158 manufactured by Alteco Co., Ltd., AY-5158 manufactured by Alteco Co., Ltd., AY-5218C manufactured by Alteco Co., Ltd., AY-5218D manufactured by Alteco Co., Ltd., AY-5259 manufactured by Alteco Co., Ltd. Examples of the adhesive include AY-5321, a known composition described in JP-A-2006-169446, and the like. Examples of the silicone resin adhesive include KER-6020-F manufactured by Shin-Etsu Chemical Co., Ltd., KER-6020-F1 manufactured by Shin-Etsu Chemical Co., Ltd., KER-6020-F2 manufactured by Shin-Etsu Chemical Co., Ltd., and the like. Examples of the polyolefin resin adhesive include MX02D manufactured by Tosoh Corporation, MX06 manufactured by Tosoh Corporation, MX07 manufactured by Tosoh Corporation, MX11 manufactured by Tosoh Corporation, MX15 manufactured by Tosoh Corporation, MX23 manufactured by Tosoh Corporation, MX28 manufactured by Tosoh Corporation, MX37 manufactured by Tosoh Corporation, MX53C manufactured by Tosoh Corporation, MZ14A manufactured by Tosoh Corporation, and JS01 manufactured by Tosoh Corporation, but are not limited thereto. These may be used alone or in combination of two or more types, as long as the blending does not cause disadvantages such as curing inhibition.

[0087] The adhesive layer may contain inorganic fillers or fibers, examples of which include silica particles, alumina particles, metal oxides such as titanium oxide, carbon particles, carbon black, graphite, and fibers thereof. The content of the above-mentioned inorganic material (particularly, inorganic filler) in the adhesive layer is not particularly limited, but from the viewpoint of hardness adjustment and coating solution viscosity, it is usually 1 wt % or more, preferably 10 wt % or more, more preferably 20 wt % or more, and even more preferably 25 wt % or more, and is usually 80 wt % or less, preferably 70 wt % or less, more preferably 50 wt % or less, and even more preferably 40 wt % or less.

[0088] [Adherend] There are no particular limitations on the shape, material, etc. of the adherend 13, so long as the sound-proofing member can be adhered to it via the adhesive layer 14. In this specification, the adherend refers to an object that holds the sheet portion (sound-insulating member) with the adhesive layer sandwiched therebetween, and more specifically, refers to a product or part that is to be sound-insulated.

[0089] The storage modulus E_adh of the adherend is not particularly limited, but it is prone to generating noise due to vibration. Therefore, the storage modulus is often high, usually 500 MPa or more, preferably 1000 MPa or more, and more preferably 2000 MPa or more, and although there is no preferred upper limit, it is usually 300,000 MPa or less. The storage modulus E_adh of the adherend is the adhesive layer The storage modulus was measured in the same manner as in It can be measured by the method. In this specification, the storage modulus E_adh of the adherend is the modulus of elasticity of the part in contact with the adhesive layer. When the part of the adherend that comes into contact with the adhesive layer is composed of two or more components, the multiple components are treated individually and each is evaluated for whether it satisfies the requirements of this embodiment. In other words, the conditions of the above formula (1) and the like are applied to one of the multiple components in relation to the sound insulation material and adhesive layer that are located directly above that component. Regarding the storage modulus E_adh of the adherend, the part where the adherend does not come into contact with the adhesive layer is When it is divided into two or more components, it is not necessary to consider the storage modulus of the components in the non-contacting portions.

[0090] The thickness of the adherend is not particularly limited, but from the viewpoint of more effectively exerting sound insulation performance, it is usually 0.5 mm or more, preferably 1 mm or more, more preferably 2 mm or more, and even more preferably 3 mm or more, and there is no preferred upper limit, but it is usually 300 mm or less. In this case, the thickness of the adherend means, for example, the thickness of the plate when the adherend is plate-shaped, the height of the cube when the adherend is a dense cube and the above-mentioned sound insulation member is laminated on the top surface of the cube via an adhesive layer, and the thickness of the plate constituting the top surface of the cube when the adherend is a hollow cube composed of six plates and the above-mentioned sound insulation member is laminated on the top surface of the cube via an adhesive layer.

[0091] The material of the adherend is not particularly limited, and examples thereof include engineering plastics, metal plates, alloy plates, etc. Examples of engineering plastics include polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polybutylene terephthalate (PBT), ultra-high molecular weight polyethylene (UHPE), syndiotactic polystyrene (SPS), amorphous polyarylate (PAR, Polyarylate), polysulfone (PSF, Polysulfone), polyethersulfone (PES, Polyethersulfone), polyphenylene sulfide (PPS, Polyphenylene sulfide), polyetheretherketone (PEEK, Polyether ketone), polyimide (PI, Polyimide), polyetherimide (PEI), fluorocarbon polymers, liquid crystal polymer (LCP, Liquid crystal polymer), etc. These may also contain resin reinforcements to increase hardness, such as glass fiber (GF) reinforced polyethylene terephthalate (GF-PET) and glass fiber reinforced polyamide (GF-PA). Examples of the metal adherend include general-purpose metals such as aluminum, iron, and stainless steel, and alloys. Also, the adherend may be a laminate of the above-mentioned resins and metals.

[0092] [Natural frequency of sound insulation structure] In a sound-insulating structure, the normalized natural frequency shift amount represented by the formula below is not particularly limited, but since it is preferable that the shift in the frequency band in which the sound-insulating effect occurs is small, it is preferably 30% or less, more preferably 25% or less, even more preferably 20% or less, particularly preferably 15% or less, even more particularly preferably 10% or less, and most preferably 5% or less, and there is no particular preferred lower limit, but it is usually 0% or more, may be 0.05% or more, or may be 0.1% or more. Normalized natural frequency shift (%) = ((design natural frequency) - (natural frequency)) ÷ (design natural frequency) Design natural frequency (Hz): Natural frequency calculated without adhesive layer Natural frequency (Hz): Natural frequency calculated with adhesive layer

[0093] A sound-insulating structure according to another embodiment of the present invention is an embodiment in which the requirement of formula (1) in the above-described sound-insulating structure is changed to the requirement of the above-described natural frequency, and specifically, the sound-insulating structure comprises a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to the side on which the convex portions are provided, and The sound insulation structure has a normalized natural frequency shift amount that satisfies the following formula and is in the range of 0 to 30%. Normalized natural frequency shift (%) = ((design natural frequency) - (natural frequency)) ÷ (design natural frequency) Design natural frequency (Hz): Natural frequency calculated without adhesive layer Natural frequency (Hz): Natural frequency calculated with adhesive layer However, it is preferable that this sound insulation structure satisfies the requirement of the above formula (1), and the conditions other than the above formula (1) can be the same as those for the above-mentioned sound insulation structure.

[0094] [Method of manufacturing sound insulation structure] The method for manufacturing the sound-insulating structure is not particularly limited, and may be, for example, a method having a step of forming a sound-insulating member having a plurality of convex portions on one side of a sheet portion, and a step of providing an adhesive layer on the sound-insulating member (on the side of the sheet portion opposite the side on which the convex portions are provided), and further, in the case of having an adherend to which the sound-insulating member is adhered via an adhesive layer, may have a step of providing an adherend to which the sound-insulating member is adhered via an adhesive layer.

[0095] In the process of forming a sound insulation member having a plurality of protrusions, the method of forming the plurality of protrusions is not particularly limited, and examples thereof include a method of preparing a mold having a plurality of cavities, pouring a resin, rubber, or a precursor thereof into the cavities, and hardening the resin, rubber, or precursor thereof. When a thermoplastic raw material is used, examples of the hardening method include a method of pouring a raw material that has been heated and melted into the cavities and then cooling the raw material to harden the raw material, and when a thermosetting or photosetting raw material is used, examples of the hardening method include a method of pouring the raw material into the cavity and then hardening the raw material by heating or light. In these cases, the heating and light conditions can be appropriately designed according to the raw material.

[0096] In the step of providing an adhesive layer on a sound insulation member, the method of providing the adhesive layer is not particularly limited, and for example, a method of applying a material for the adhesive layer to the sound insulation member manufactured in the step of forming the sound insulation member having a plurality of convex portions described above can be mentioned. In the case of application, the conditions and the like of a known method can be applied.

[0097] In the step of providing an adherend to which the sound-insulating member is adhered via an adhesive layer, the method of adhering the adherend is not particularly limited, and examples thereof include a method in which the adhesive is melted by heating or the like, the adherend is brought into contact with the molten adhesive, and then the adhesive is cooled to harden the adhesive.

[0098] Specific examples of the manufacturing method when an adherend is included include manufacturing methods 1 to 4 shown below. The shape of the cavity used in each manufacturing method is not particularly limited, but the shape of the bottom can be appropriately selected from hemispherical, flat, convex, concave, etc. Manufacturing methods 3, 4, etc. can be based on the manufacturing methods described in International Publication No. WO 2010 / 3080794, etc.

[0099] (Manufacturing method 1) The production method 1 may include the following steps (1) to (3). (1) A process in which a mold with multiple cavities is prepared and resin material is poured into the cavities. (2) The process of hardening the poured resin material. (3) A step of peeling the obtained cured product from the mold. In the production method 1, after the step (2) or (3), a step is provided in which an adhesive is applied to the obtained cured product (or adherend) to adhere the cured product to the adherend.

[0100] (Manufacturing method 2) The production method 2 may include the following steps (4) to (7). (4) A step of preparing a mold having a plurality of cavities and placing weights in the plurality of cavities formed in the mold. (5) The process of pouring resin material into the cavity. (6) The process of hardening the poured resin material. (7) A step of peeling the obtained cured product from the mold. In the production method 2, after the step (6) or (7), a step is provided in which an adhesive is applied to the obtained cured product (or adherend) and an adherend is provided on the cured product.

[0101] (Manufacturing method 3) The production method 3 may include the following steps (8) to (13). (8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having multiple cavities. (9) A step of laminating a support on the elastomer precursor or resin precursor that has been planarized on the mold. (10) A step of filling the cavity of the laminate of the support and the mold with the elastomer precursor or resin precursor from the support side using a pressure roll. (11) A process in which the elastomer precursor or resin precursor to which the cavity shape of the mold has been transferred is cured by irradiating light from the support side, and the cured product of the elastomer precursor or resin precursor is polymerized and bonded to the support. (12) A step of peeling off the bonded product of the elastomer precursor or the cured product of the resin precursor and the support from the mold. (13) A step of adhering the support to the adherend with an adhesive.

[0102] (Manufacturing method 4) The production method 4 may include the following steps (14) to (17). (14) A process of rotating a roll mold having an outer peripheral surface on which a plurality of cavities are arranged, applying a photocurable elastomer precursor or a photocurable resin precursor to the outer peripheral surface of the roll mold while running a support coated with an adhesive in the rotation direction of the roll mold along the outer peripheral surface of the roll mold, and filling the cavities with the elastomer precursor or the resin precursor. Note that in this process, since the photocurable resin and the support are bonded by hardening, no adhesive is required, and from the viewpoint of improving productivity, an embodiment in which no adhesive is used is preferable. (15) A step of irradiating the region between the outer circumferential surface of the roll mold and the support with light while the elastomer precursor or resin precursor is sandwiched between the outer circumferential surface of the roll mold and the support. (16) A step of peeling off the bonded product of the elastomer precursor or resin precursor and the support obtained in the step (15) from the roll mold. (17) A step of adhering the support to the adherend with an adhesive.

[0103] The method of providing the resonator 11 and the protrusions 31 on the sheet 10 may be, as described above, a method of integrally molding the resonator 11 and the protrusions 31 using a mold, a method of pressing each separately molded part by heating or pressing it, or a method of bonding the parts using various known adhesives, such as a method of bonding them by heat welding, ultrasonic welding, laser welding, etc. Examples of the adhesive include, but are not limited to, epoxy resin adhesives, acrylic resin adhesives, polyurethane resin adhesives, silicone resin adhesives, polyolefin resin adhesives, polyvinyl butyral resin adhesives, and mixtures thereof. Note that a part or the whole of the resonator 11 and the protrusions 31 can also be formed by punching out a rubber plate obtained by the above molding method. In addition, when a part of the resonator 11 is made of a metal or an alloy, it can be formed by cutting the metal or alloy. Another example is a manufacturing method using a 3D printer, etc.

[0104] From the viewpoint of improving productivity and economy, it is preferable to integrally mold the sound insulation member 12 by molding with a mold or casting, etc. As an example, a mold or casting having a cavity corresponding to the integrally molded product of the sheet portion 10 and the resonator portion 11 is used. , S Examples of such integral molding methods include a method of molding the core part 10 and the resonator part 11 into an integrally molded product. As such integral molding methods, various known methods are known, such as press molding, compression molding, cast molding, extrusion molding, and injection molding, and the type is not particularly limited. If the raw material of each part is, for example, a resin material having viscoelasticity, it can be poured into the cavity in the form of a liquid precursor or a heated melt. If it is a metal, an alloy, or inorganic glass, it can be placed (inserted) in advance at a predetermined position in the cavity. The resin material is not particularly limited, and examples thereof include the materials exemplified above for the sound insulation member and their raw materials and intermediates.

[0105] 14 to 17 are diagrams showing an example of a manufacturing process of the sound insulation member 12. Here, a mold 61 having a cavity 61a having a shape corresponding to the resonating portion 11 described above is used (see FIG. 14), and the weight portion 22 is placed in the cavity 61a of the mold 61 (see FIG. 15). Then, a resin material having viscoelasticity is poured into the cavity 61a, and after heating or pressurization as necessary (see FIG. 16), the integrally molded product of the sheet portion 10 and the resonating portion 11 is released from the mold to obtain the sound insulation member 12. According to such an integral molding method, not only can the productivity and economy be improved, but also a complex shape can be easily molded, and the adhesion between the parts is increased, so that the sound insulation member 12 having excellent mechanical strength tends to be easily obtained. From these viewpoints as well, it is preferable that the sheet portion 10 and the resonating portion 11 are integrally molded products containing a thermosetting elastomer or a thermoplastic elastomer.

[0106] The above-mentioned sound-proof structure has a plurality of resonating parts in contact with the sheet surface of the sheet part 10. 11Therefore, when sound waves are incident from a noise source, a high sound insulation performance exceeding the mass law can be obtained. In addition, the resonant frequency of the resonant portion 11 can be easily controlled by adjusting the spring constant by changing the shape, density distribution, or material (storage modulus, mass) of the resonant portion 11 and the base portion 21, or by changing the mass of the weight portion 22. Furthermore, the frequency band (acoustic band gap width and frequency position) can be controlled by the material, thickness, etc. of the sheet portion 10. Therefore, the sound insulation structure 1 according to this embodiment has a higher degree of freedom in selecting sound insulation frequencies and a higher degree of freedom in design than conventional ones. The above-mentioned sound-proof structure can be used not only as a structure intended for sound insulation, but also as a structure intended for vibration control.

[0107] [Simulation of resonance frequency] In the examples described later, the resonance frequency of the structure was calculated using COMSOL Multiphysics (COMSOL), which is a physical simulation software using the finite element method. The conditions of the physical simulation will be described in detail below. The above method is a numerical analysis method for approximately solving differential equations that cannot be analytically solved by the finite element method with high accuracy, and is a method for dividing a complex object to be analyzed into simple small parts (elements) and approximately calculating the behavior of the whole. The protrusion resonance frequency in the examples described later was calculated using the following procedure. For each of the portions i to v of the sound insulation structure in Figs. 18 to 21, the physical properties (specific gravity, storage modulus (Young's modulus), and Poisson's ratio) shown in Tables 1 to 7 and the material dimensions (r1, r2, h i ~h v , a, and b were substituted into the equations of the solid mechanics module of COMSOL Multiphysics (COMSOL), and the natural vibration mode was calculated under the condition that the bottom surface of the sheet part v was completely fixed, and the resonant frequency under various conditions was calculated. Note that Figure 18 shows an embodiment using a perforated disk, Figure 19 shows an embodiment using a perforated nut (hexagonal plate) as the weight part, Figure 20 shows an embodiment without a weight part, and Figure 21 shows an embodiment without a weight part and employing a laminated structure of rubber layers and PET layers as the sheet part. Next, the resonance frequency f0 was defined as the ideal state in which the material was completely fixed to the adherend without any adhesive, and the resonance frequency f was compared when adhesives of various physical properties were used. In the examples described later, a small dF=(f-f0) / f0×100[%] was adopted as a good installation and adhesion condition. In other words, a small dF, which is the deviation from the design frequency of the sheet, is a good adhesion condition. dF is preferably as small as possible, preferably 20% or less, more preferably 10% or less, and even more preferably 5% or less. EXAMPLES

[0108] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. Various conditions can be adopted in the present invention as long as they do not deviate from the gist of the present invention and the object of the present invention is achieved.

[0109] [Calculation of natural frequency] For each of the portions i to v of the sound insulation material, the physical properties (specific gravity, Young's modulus, Poisson's ratio) and material dimensions r1, r2, h i ~h v The natural frequency of the protrusion when it vibrates in a stretching manner was calculated by substituting a, b, and a into the equations of the solid mechanics module of the multiphysics analysis software COMSOL Multiphysics (COMSOL) and using the finite element method. Note that H in the following table is H=h ii +h iii -h i This is the value calculated as follows. In order to compare the magnitude of the shift in the natural frequency, the normalized shift in the natural frequency is defined as follows: The design natural frequency below is the natural frequency when the same sheet and projection shape does not include an adhesive layer. Normalized natural frequency shift (%) = ((design natural frequency) - (natural frequency)) ÷ (design natural frequency) Moreover, a graph showing the relationship between the normalized natural frequency shift amount obtained by the above calculation and β is shown in Fig. 22. β is the ratio of (E_glue / I_glue) / (E_membrane / H).

[0110] <Aspect in which a holed disk is used as the weight part> [Example 1] Example 1 is a unit cell including the sound insulation sheet member shown in Fig. 18. The size, material, and physical properties of the constituent members of the unit cell are shown in Table 1. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. As a result of the calculation, in Example 1, the natural frequency is 4353 Hz and the normalized natural frequency shift amount is 13.4 % It was confirmed that the frequency deviation was sufficiently small and the frequency was as designed.

[0111] [Comparative Example 1] Comparative Example 1 is also a unit cell including the sound insulation sheet member shown in Fig. 18. The size, material, and physical properties of the constituent members of the unit cell are shown in Table 1. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. As a result of the calculation, comparison In Example 1, the natural frequency is 3626 Hz and the normalized natural frequency shift is 27.8 % It was confirmed that the frequency deviation was large and that the frequency was significantly different from the design frequency due to the influence of the adhesive layer.

[0112] [Reference example 1] Reference Example 1 is also a unit cell including the sound insulation sheet member shown in Fig. 18. The size, material, and physical properties of the constituent members of the unit cell are shown in Table 1. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. This reference example is an embodiment in which no adhesive is used. As a result of the calculation, in Reference Example 1, the natural frequency was 5025 Hz and the normalized natural frequency shift amount was 0%.

[0113] [Table 1]

[0114] <An embodiment using a perforated nut (hexagonal column) as the weight part> [Examples 2 to 7] Examples 2 to 7 are unit cells including the sound-proof sheet member shown in Fig. 19. The size, material and physical properties of the constituent members of the unit cells are shown in Table 2. The natural frequency of the stretching vibration of the protrusions in the unit cells was calculated based on the above calculation method. As a result of the calculation, in Examples 2 to 7, the natural frequencies were 3545 to 5024 Hz and the normalized natural frequency shift amounts were 0.0 to 13.4%, confirming that the frequency deviations were sufficiently small and the frequencies were as designed.

[0115] [Comparative Examples 2 to 5] Comparative Examples 2 to 5 are also unit cells including the sound insulation sheet member shown in Fig. 19. The size, material and physical properties of the constituent members of the unit cell are shown in Table 3. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. As a result of the calculation, in Comparative Examples 2 to 5, the natural frequencies were 1962 to 3626 Hz and the normalized natural frequency shift amounts were 27.8 to 61.0%, confirming that the frequency deviation was large and that the frequency was significantly different from the design frequency due to the influence of the adhesive layer.

[0116] [Table 2]

[0117] [Table 3]

[0118] <Without weight part> [Examples 8 to 14] Examples 8 to 14 are unit cells including the sound-proof sheet member shown in Fig. 20. The size, material, and physical properties of the constituent members of the unit cells are shown in Table 4. The natural frequency of the stretching vibration of the protrusions in the unit cells was calculated based on the above calculation method. As a result of the calculation, in Examples 8 to 14, the natural frequencies were 3759 to 5319 Hz and the normalized natural frequency shift amounts were 0.0 to 11.4%, confirming that the frequency deviations were sufficiently small and the frequencies were as designed.

[0119] [Comparative Examples 6 to 8] Comparative Examples 6 to 8 are also unit cells including the sound insulation sheet member shown in Fig. 20. The size, material and physical properties of the constituent members of the unit cell are shown in Table 5. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. As a result of the calculation, in Comparative Examples 6 to 8, the natural frequency was 3155 to 3156 Hz and the normalized natural frequency shift amount was 40.7%, and it was confirmed that the frequency deviation was large and significantly different from the design frequency due to the influence of the adhesive layer.

[0120] [Table 4]

[0121] [Table 5]

[0122] <An embodiment in which there is no weight portion and a laminated structure of a rubber layer and a PET layer is used as the sheet portion> [Examples 15 to 21] Examples 15 to 21 are unit cells including the sound-proof sheet member shown in Fig. 21. The size, material, and physical properties of the constituent members of the unit cells are shown in Table 6. The natural frequency of the stretching vibration of the protrusions in the unit cells was calculated based on the above calculation method. As a result of the calculation, in Examples 15 to 21, the natural frequencies were 3942 to 5577 Hz and the normalized natural frequency shift amounts were 0.0 to 3.4%, confirming that the frequency deviations were sufficiently small and the frequencies were as designed.

[0123] [Comparative Examples 9 to 11] Comparative Examples 9 to 11 are also unit cells including the sound insulation sheet member shown in Fig. 21. The size, material and physical properties of the constituent members of the unit cell are shown in Table 7. The natural frequency of the stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method. As a result of the calculation, in Comparative Examples 9 to 11, the natural frequency was 3822 to 3824 Hz and the normalized natural frequency shift amount was 31.4 to 31.5%, and it was confirmed that the frequency deviation was large and significantly different from the design frequency due to the influence of the adhesive layer.

[0124] [Table 6]

[0125] [Table 7]

[0126] From Tables 1 to 7 and Fig. 22, it was found that when β is 0.5 or more, the frequency band where the sound insulation effect occurs is less likely to shift, specifically, the normalized natural frequency shift amount is 20% or less. Furthermore, it was found that when β is 100 or more, there is no frequency shift. [Explanation of symbols]

[0127] 1. Sound insulation structure 10 Seat section 10(a) Layer (forming the sheet portion) 10(b) Layer (constituting the sheet portion) 10(c) Layer (Constituting the Sheet Part) 11 Resonance section 12 Sound insulation materials 13 Adherent 14 Adhesive layer 21 Base 22 Weight 31 Rib-like protrusion 32 Cylindrical protrusion 61 Mold 61a Cavity H Height of the seat and resonator (convex) H_sheet Part height H_res Height of the resonator I_glue Average thickness of adhesive layer r1 Radius of the weight r2 Radius of the hole in the weight h Height h_sheet height h_res Height h_glue film thickness a Sheet length i Weight ii base iii Seat section iii-1 Seat part 1 iii-2 Seat part 2 iv adhesive layer v Adherent

Claims

1. A sound-insulating structure comprising at least a sound-insulating member having a sheet-like sheet portion and a plurality of convex portions provided on one surface of the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to the side on which the convex portions are provided, wherein the sound-insulating structure satisfies the following formula (1): E_glue / I_glue>0.5×(E_membrane / H) (1) E_glue (MPa): storage modulus of adhesive layer I_glue (mm): Average thickness of adhesive layer E_membrane (MPa): storage modulus of the sheet portion and the protrusions H (mm): Average height of the sheet portion and the protrusions

2. The sound-insulating structure according to claim 1 , further comprising an adherend to which the sound-insulating member is adhered via the adhesive layer.

3. The sound insulation structure according to claim 2 , which satisfies the following formulas (2) and (3). 7000≧E_glue / E_membrane≧0.5 (2) 50.0≧E_glue / E_adh≧0.00002 (3) E_glue (MPa): storage modulus of adhesive layer E_membrane (MPa): storage modulus of the sheet portion and the protrusions E_adh (MPa): Storage modulus of adherend

4. The sound insulation structure according to any one of claims 1 to 3, which satisfies the following formula (4): 1.0 ≧ I_glue ≧ 0.005 (4) I_glue (mm): Average thickness of adhesive layer

5. The sound insulation structure according to any one of claims 1 to 4, wherein the formula (1) satisfies the following formula (1)': E_glue / I_glue>β×(E_membrane / H) (1)' In the above formula (1)′, E_glue, I_glue, E_membrane, and H are the same as E_glue, I_glue, E_membrane, and H in the above formula (1), and β=5.

6. The sound insulation structure according to any one of claims 1 to 5, wherein the E_glue is greater than 10 MPa.

7. 7. The sound-insulating structure according to claim 1, wherein the adhesive layer contains one or more resins selected from the group consisting of silicone-based resins, epoxy-based resins, and cyanoacrylate-based resins, and the total content of these resins in the adhesive layer is 10% by weight or more.

8. 8. The sound insulation structure according to claim 1, wherein the adhesive layer contains an inorganic filler, and the content of the inorganic filler in the adhesive layer is 1% by weight or more.

9. A method for manufacturing a sound-insulating structure having a sound-insulating member having a sheet-like sheet portion and a plurality of protrusions provided on the sheet portion, and an adhesive layer provided on a surface of the sheet portion opposite to a side on which the protrusions are provided, comprising: A step of forming a sound-insulating member having a plurality of protrusions on one surface of a sheet portion; and providing an adhesive layer on the sound-insulating member; and A method for manufacturing a sound insulation structure, which satisfies the following formula (1): E_glue / I_glue>0.5×(E_membrane / H) Formula (1) E_glue (MPa): storage modulus of adhesive layer I_glue (mm): Average thickness of adhesive layer E_membrane (MPa): storage modulus of the sheet portion and the protrusions H (mm): Average height of the sheet portion and the protrusions

10. The method for manufacturing a sound-insulating structure according to claim 9 , further comprising the step of providing an adherend to which the sound-insulating member is adhered via the adhesive layer.

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