Composite sound-absorbing material

Abstract

A composite sound-absorbing material is provided. The composite sound-absorbing material according to an embodiment of the present invention includes a base material layer composed of at least one or more first fibers and a fiber sheet composed of at least one or more second fibers and disposed on at least one surface of the base material layer, and the base material layer and the fiber sheet are embodied to satisfy predetermined conditions. According to the present invention, it is possible to simultaneously exhibit an excellent heat insulation effect and an excellent sound absorption effect in the entire sound range. In addition, while exhibiting the heat insulation and sound absorption effects, there is an effect that it is possible to simultaneously exhibit excellent effects in terms of volume reduction and light weight.

Description

Technical Field

[0001] The present invention relates to a sound-absorbing material, and more particularly to a composite sound-absorbing material formed by combining two or more layers.

Background Art

[0002] A sound-absorbing material is a product having a function of absorbing sound, and is widely used in architecture, automobiles, and various industrial fields, mainly in the form of non-woven fabric.

[0003] A basic sound-absorbing material has a principle of receiving sound wave energy, converting it into other kinetic energy such as vibration, and then converting it into thermal energy to be absorbed by the atmosphere or the sound-absorbing material itself to attenuate the sound. Generally, the noise generated in the surroundings has various wavelengths such as a low frequency range of 300 Hz or less, a mid-frequency range of 300 to 2,000 Hz, and a high frequency range of 2,000 Hz or more by wavelength band. In order to convert it into kinetic energy such as vibration, various forms of sound-absorbing materials are required.

[0004] There are various noise sources such as automobiles, the noise of apartment stairs, lecture rooms, studios, concert halls, etc. In order to appropriately solve this, various forms and structures of sound insulation materials and sound absorption materials are also applied.

[0005] Recently, due to the change of the mobility paradigm of automobiles and the like from an internal combustion engine to an electric motor base, the number of parts has decreased by more than 30%, and the concept has changed from a transportation purpose to various living spaces. With the design centered on the expansion of the interior space of the vehicle, the drive system, safety module, convenience facilities, etc. of the automobile including the battery are concentrated in a narrow space, and the importance of sound absorption performance and multi-functional vehicle interior materials is increasing.

[0006] In addition to the noise generated from the engine, there are various noises such as the noise transmitted to audio equipment, tires, etc., and the wind noise generated during driving. Since electric vehicles do not have an engine sound, road noise, inflowing wind cutting noise, and high-frequency noise heard from the electric motor (with high noise sensitivity) are relatively major issues in various parts of the front. Compared to internal combustion engines, electric vehicles have a larger interior space, and noise is amplified by resonance phenomena. Also, since they use battery power to simultaneously operate the vehicle drive and the internal temperature control system, it affects the driving range. Therefore, the importance of built-in materials for internal temperature management is becoming even more prominent.

[0007] As a method for reducing noise in electric vehicles, the method of applying sound absorption and insulation materials to reduce noise is most commonly used. Most of the sound absorption and insulation materials use porous materials such as PET non-woven fabric, ultra-fine fibers, and urethane foam, and are applied thickly for heat insulation.

[0008] However, in the case of conventional noise reduction materials, it is impossible to reduce noise in the entire frequency range, and there are problems of large weight and volume. In this case, the reduction of fuel efficiency in electric vehicles causes various disadvantages such as an increase in production costs.

[0009] Therefore, it is necessary to develop a sound absorption material that exhibits excellent heat insulation effects and excellent sound absorption effects in the entire frequency range, while also exhibiting excellent effects in reducing volume and weight.

Summary of the Invention

Problems to be Solved by the Invention

[0010] The object of the present invention was devised in consideration of the above points, and it is to provide a composite sound absorption material that is composed of two or more layers and exhibits excellent heat insulation effects and excellent sound absorption effects in the entire frequency range.

[0011] Another object of the present invention is to provide a composite sound absorption material that exhibits excellent heat insulation effects and excellent sound absorption effects in the entire frequency range, while also exhibiting excellent effects in reducing volume and weight.

Means for Solving the Problems

[0012] In order to solve the above problems, the present invention provides a composite sound-absorbing material including a base material layer composed of at least one or more first fibers and a fiber sheet composed of at least one or more second fibers and disposed on at least one surface of the base material layer, and the base material layer and the fiber sheet satisfy the following condition (1).

[0013]

Number

[0014] At this time, a is the average diameter (μm) of the first fibers of the base material layer, and b is the thickness (μm) of the fiber sheet.

[0015] According to an embodiment of the present invention, the base material layer and the fiber sheet can satisfy the following condition (1).

[0016]

Number

[0017] At this time, a is the average diameter (μm) of the first fibers of the base material layer, and b is the thickness (μm) of the fiber sheet.

[0018] Further, the first fibers may have an average diameter of 0.5 to 10 μm, and the base material layer may have an average thickness of 10 to 3,000 mm.

[0019] Further, the second fibers may have an average diameter of 100 nm to less than 1,000 nm, and the fiber sheet may have an average thickness of 10 to 200 μm.

[0020] Further, at least a part of the fiber sheet may be fused and fixed to at least one surface of the base material layer.

[0021] Further, a binder layer interposed between the base material layer and the fiber sheet may be further included.

[0022] Further, the fiber sheet may be disposed on both sides of the base material layer.

[0023] Further, the first fiber may contain at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polylactic acid, polyurethane, and nylon 6,6, and the base material layer may contain any one or more of melt-blown nonwoven fabric and spunlace nonwoven fabric.

[0024] Further, the second fiber may contain at least one selected from the group consisting of polyvinylidene fluoride, nylon 6,6, polyacrylonitrile, polystyrene, polyurethane, polysulfone, polyvinyl alcohol, polyvinylidene fluoride, polyvinyl butyral, and polylactic acid, and the fiber sheet may be formed by accumulating predetermined fibers.

Advantages of the Invention

[0025] The composite sound-absorbing material according to the present invention can simultaneously exhibit an excellent heat insulation effect and an excellent sound absorption effect in the entire sound range. In addition, while exhibiting the heat insulation and sound absorption effects, there is an effect that it can simultaneously exhibit excellent effects in terms of volume reduction and light weight.

Brief Description of the Drawings

[0026] FIG. 1 is a schematic cross-sectional view of a composite sound-absorbing material according to an embodiment of the present invention.

[0027] FIG. 2 is a schematic cross-sectional view of a composite sound-absorbing material according to another embodiment of the present invention.

[0028] FIG. 3 is a scanning electron microscope (FE-SEM) photograph of a fiber sheet according to an embodiment of the present invention.

Best Mode for Carrying Out the Invention

[0029] Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. The present invention can be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly explain the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

[0030] As shown in FIG. 1, a composite sound-absorbing material 1000 according to an embodiment of the present invention includes a base material layer 200 composed of at least one or more first fibers, and a fiber sheet 100 composed of at least one or more second fibers and disposed on at least one surface of the base material layer 200.

[0031] Prior to describing each component included in the composite sound-absorbing material 1000 of the present invention, the reason why the base material layer 200 and the fiber sheet 100 included in the composite sound-absorbing material 1000 of the present invention must satisfy the following condition (1) will be described.

[0032] In the composite sound-absorbing material 1000, if the average diameter of the fibers constituting the base material layer 200 is too small, the sound-absorbing performance may decrease in the high-frequency region, and the lightness may decrease as the basis weight increases. If the average diameter of the fibers constituting the base material layer 200 is very large, the sound-absorbing performance may decrease in the high-frequency region. Also, if the average thickness of the fiber sheet 100 is too small, the heat insulation effect and the sound-absorbing performance in the mid-low frequency range may decrease. If the average thickness of the fiber sheet 100 is too large, the volume may increase and the lightness may decrease.

[0033] Accordingly, the base material layer 200 and the fiber sheet 100 included in the composite sound-absorbing material 1000 should be composed of fibers having an appropriate average fiber diameter and should exhibit an appropriate thickness. The composite sound-absorbing material 1000 according to the present invention satisfies the following condition (1) in order to solve such problems.

[0034] JPEG2025517762000004.jpg12169

[0035] At this time, the a is the average diameter (μm) of the first fiber of the base material layer 200, and the b is the thickness (μm) of the fiber sheet 100.

[0036] JPEG2025517762000005.jpg30169

[0037]

[0038] Hereinafter, each component included in the composite sound absorbing material 1000 will be specifically described.

[0039] First, the base material layer 200 will be described.

[0040] The base material layer 200 serves as the base material of the composite sound absorbing material 1000 and performs functions such as sound absorption in the high-frequency region, lightweight property of the composite sound absorbing material 1000, and volume reduction function.

[0041] As described above, the base material layer 200 is composed of the first fiber, and preferably, it may be a porous member composed of the first fiber. As an example, the base material layer 200 may be a non-woven fabric, a woven fabric, or a cloth.

[0042] The woven fabric means that the fibers contained in the woven fabric have vertical and horizontal directions, and the specific weave may be plain weave, twill weave, etc., and the densities of the warp and weft are not particularly limited. In addition, the knitted fabric may be a known knitting structure, such as weft knitting or warp knitting. As an example, it may be a tricot in which the raw yarn is weft knitted. Also, as shown in FIG. 1, the base material layer 200 may be a non-woven fabric without vertical and horizontal directions in the first fiber, and may be a dry non-woven fabric such as a chemical bonding non-woven fabric, a thermal bonding non-woven fabric, an air-laid non-woven fabric, or a wet non-woven fabric, a spunlace non-woven fabric, a needle-punched non-woven fabric, or a melt-blown non-woven fabric manufactured by various methods, preferably any one or more of a spunlace non-woven fabric, a needle-punched non-woven fabric, and a melt-blown non-woven fabric, more preferably any one or more of a spunlace non-woven fabric and a melt-blown non-woven fabric, and even more preferably a melt-blown non-woven fabric.

[0043] The base material layer 200 serves as a base material and may have an average thickness of 10 to 3,000 mm, preferably 10 to 1,000 mm, in order to perform functions such as sound absorption in the high-frequency region, lightweight property of the composite sound-absorbing material 1000, and volume reduction function. When the average thickness of the base material layer 200 is less than 10 mm, the sound absorption performance in the high-frequency region may decrease. When the average thickness of the base material layer 200 exceeds 3,000 mm, the lightweight property may significantly decrease and the volume may significantly increase.

[0044] Also, the first fiber may have an average diameter of 0.5 to 10 μm, preferably 0.5 to 3 μm, so as to satisfy the above-described condition (1). If the average diameter of the first fiber is less than 0.5 μm, the sound absorption performance in the high-frequency region may decrease and the lightweight property may decrease. If the average diameter of the first fiber exceeds 10 μm, the lightweight property and the sound absorption performance in the high-frequency region may decrease.

[0045] The first fiber is usually a material that can form fibers and can form a base material layer including the fibers, and there is no limitation on the material. Preferably, it may include at least one or more selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polylactic acid, polyurethane, and nylon 6,6, and preferably may include polypropylene.

[0046] Note that the base material layer 200 may contain a low melting point component in order to be bound to the fiber sheet described later even without a separate adhesive or adhesive layer. When the base material layer 200 is a fabric such as a non-woven fabric, the first fiber may be made of a first composite fiber containing a low melting point component. The first composite fiber may include a support component and a low melting point component, and at least a part of the low melting point component may be arranged so as to be exposed on the outer surface. As an example, it may be a sheath-core type composite fiber in which the support component forms a core part and the low melting point component forms a sheath part surrounding the core part, or a side-by-side composite fiber in which the low melting point component is arranged on one side of the support component. The low melting point component and the support component may be polyolefin-based. As an example, the support component may be polypropylene and the low melting point component may be polyethylene. The melting point of the low melting point component may be 60 to 180°C.

[0047]

[0048] Next, the fiber sheet 100 disposed on at least one surface of the base material layer 200 will be described.

[0049] The fiber sheet 100 performs functions such as heat insulation, sound absorption in the medium and low frequency regions, lightweight of the composite sound absorber 1000, and volume reduction.

[0050] As described above, the fiber sheet 100 is composed of the second fiber, preferably, it may be a porous member composed of the second fiber, and more preferably, the fiber sheet 100 may be a member having a three-dimensional network structure formed by randomly three-dimensionally laminating a fabric, a woven fabric, or spun fibers.

[0051] In order for the fiber sheet 100 to perform functions such as heat insulation, sound absorption in the medium and low frequency regions, lightweight property of the composite sound absorption material 1000, and volume reduction, the second fiber may have an average diameter of 100 nm to less than 1,000 nm, preferably 100 to 800 nm, more preferably 100 to 500 nm. If the average diameter of the second fiber is less than 100 nm, the lightweight property of the composite sound absorption material may decrease, and if it is 1,000 nm or more, the heat insulation and sound absorption performance in the medium and low frequency regions may decrease due to an increase in voids.

[0052] The fiber sheet 100 may have an average thickness of 10 to 200 μm, preferably an average thickness of 10 to 150 μm, so as to satisfy the above-described condition (1). When the average thickness of the fiber sheet 100 is less than 10 μm, the heat insulation effect and the sound absorption performance in the medium and low bass regions may decrease, and when the average thickness exceeds 200 μm, the volume may increase and the lightweight property may decrease.

[0053] The second fiber can usually form fibers, and there is no limitation on the material in the case of a material that can form the fiber sheet 100 including the fiber. However, for the purpose of the present invention, preferably, it may contain at least one selected from the group consisting of polyvinylidene fluoride, nylon 6,6, polyacrylonitrile, polystyrene, polyurethane, polysulfone, polyvinyl alcohol, polyvinylidene fluoride, polyvinyl butyral, and polylactic acid, and more preferably, it may contain polyvinylidene fluoride (PVDF). As an example, the PVDF may have a weight average molecular weight of 300,000 to 500,000, which is advantageous for achieving the object of the present invention through this.

[0054] As shown in FIG. 2, the fiber sheet 100 may be disposed on both sides of the base material layer 200. In this case, the heat insulation and sound absorption effects of the composite sound absorption material 1000 are even more excellent in the whole sound range.

[0055] Note that the fiber sheet 100 may contain a low melting point component in order to bind to the fiber sheet 100 described later, even without a separate adhesive or adhesive layer. When the fiber sheet 100 is a member having a three-dimensional network structure formed by randomly three-dimensionally laminating spun fibers, the second fiber may be made of a second composite fiber containing a low melting point component. The second composite fiber may include a support component and a low melting point component, and at least a part of the low melting point component may be arranged so as to be exposed on the outer surface. As an example, it may be a sheath-core type composite fiber in which the support component forms a core part and the low melting point component forms a sheath part surrounding the core part, or a side-by-side composite fiber in which the low melting point component is arranged on one side of the support component. The low melting point component may be a polyolefin-based material. As an example, the low melting point component may be polyethylene. The melting point of the low melting point component may be 60 to 180°C.

[0056]

[0057] Note that the composite sound absorbing material 1000 according to an embodiment of the present invention may further include a binder layer interposed between the base material layer 200 and the fiber sheet 100.

[0058] The binder layer functions to fix between the base material layer 200 and the fiber sheet 100. The binder layer can usually be used without limitation as long as it is a substance capable of functioning to fix between two layers composed of fibers in the art. Preferably, it may contain one or more selected from the group consisting of polyvinyl butyral (PVB), polyvinyl alcohol-based (PVA), and low melting point PET, and more preferably, it may contain polyvinyl butyral (PVB).

[0059]

[0060] The above-mentioned composite sound-absorbing material 1000 can be manufactured by the manufacturing method described later, but is not limited thereto.

[0061] First, when the fiber sheet 100 is a member having a three-dimensional network structure formed by randomly three-dimensionally laminating spun fibers, or in the case of a method of forming a fiber web having a three-dimensional network shape by including fibers, it can be used without limitation. As an example, the spinning can be carried out by electrospinning. While adding air in the same direction as the spinning direction of the spinning nozzle adjacent to the outer periphery of the spinning nozzle, a spinning solution containing a fiber-forming component is discharged from the spinning nozzle, and the fiber sheet 100 can be manufactured through the manufacturing stage.

[0062] The spinning solution may contain a fiber-forming component and a solvent. The fiber-forming component is preferably contained in the spinning solution at 5 to 30% by weight, preferably 8 to 20% by weight. When the fiber-forming component is less than 5% by weight, it is difficult to form into fibers, and it is not spun in a fibrous form during spinning, but is sprayed in a droplet state to form a film, or even if spinning is carried out, many beads are formed, the volatilization of the solvent does not go well, and the phenomenon of pore clogging may occur in the calendar process described later. Also, when the fiber-forming component exceeds 30% by weight, the viscosity increases, solidification occurs on the surface of the solution, spinning becomes difficult for a long time, the diameter of the fiber increases, and it is impossible to form a fiber shape with a size of less than micrometers.

[0063] The solvent can be used without limitation as long as it dissolves the fiber-forming component without generating precipitates and does not affect the spinnability of the fibers described later. Preferably, it may contain any one or more selected from the group consisting of γ-butyrolactone, cyclohexanone, 3-hexanone, 3-heptanone, 3-octanone, N-methylpyrrolidone, dimethylacetamide, acetone, dimethyl sulfoxide, and dimethylformamide. As an example, the solvent may be a mixed solvent of dimethylacetamide and acetone. When the solvent contains acetone and dimethylacetamide, the dimethylacetamide and acetone may be contained in a weight ratio of 1:0.1 to 0.4, preferably in a weight ratio of 1:0.15 to 0.35.

[0064] The above-mentioned spinning solution may be electrospun using a conventional known electrospinning apparatus. As an example, the electrospinning apparatus may be an electrospinning apparatus equipped with a single spinning pack with one spinning nozzle, or for mass production, may be equipped with a plurality of single spinning packs, or may use an electrospinning apparatus equipped with a plurality of spinning packs. In addition, in the electrospinning method, dry spinning or wet spinning with an external coagulation bath can also be used, and there is no limitation by the method.

[0065] Note that, in order to achieve the object of the present invention, the electrospinning is preferably carried out under the conditions of an applied voltage of 10 to 30 kV, a distance between the spinning nozzle and the current collector of 10 to 30 cm, a discharge amount per minute of 0.02 to 0.08 cc / ghole, a temperature of 10 to 50 °C, and a relative humidity of 40 to 80%, and more preferably under the conditions of an applied voltage of 15 to 25 kV, a distance between the spinning nozzle and the current collector of 15 to 25 cm, a discharge amount per minute of 0.03 to 0.07 cc / ghole, a temperature of 15 to 45 °C, and a relative humidity of 45 to 75%.

[0066] Thereafter, the second fibers formed through the spinning can be thermally fused to form a fiber aggregate. The second fibers spun and formed through the electrospinning accumulate to form a three-dimensional network structure, and in order to have the desired thickness and the like, heat and / or pressure may be applied to the accumulated second fibers. The heat and / or pressure can be used without limitation as long as it is a method capable of thermally fusing polymer-derived fibers commonly used in the industry, and preferably can be carried out through a calender via a heated roller. At this time, the temperature of the heat applied through the calender may be 70 to 190 °C, preferably 120 to 180 °C.

[0067]

[0068] Next, the step of positioning and laminating the fiber sheet 100 on at least one surface of the base material layer 200 can be performed.

[0069] The lamination can be performed by applying one or more of heat and pressure, and a specific method of applying one or more of the heat and pressure can adopt a known method. As a non-limiting example, a normal calendar process can be used, and the temperature of the heat applied at this time may be 70 to 190°C. Also, when performing the calendar process, it can also be performed in several divided steps and multiple times. For example, after the first calendar, the second calendar can also be performed. At this time, the degree of heat and / or pressure applied in each calendar process may be the same or different. Through the lamination step, binding through heat fusion can occur between the fiber sheet 100 and the base material layer 200, and there is an advantage that a separate adhesive or adhesive layer can be omitted.

Embodiments for Carrying out the Invention

[0070] The present invention will be described more specifically based on the following examples, but the following examples do not limit the scope of the present invention, and this should be understood as being for the purpose of assisting in the understanding of the present invention.

[0071] <Example 1>

[0072] First, polyvinylidene fluoride (PVDF) as a fiber-forming component was dissolved in a mixed solvent of 80% by weight of dimethylacetamide and 20% by weight of acetone as a solvent so as to be 15% by weight based on the total weight of the spinning solution, and a spinning solution was produced.

[0073] The prepared spinning solution was transferred to a spinning nozzle pack, and electrospinning was carried out in a spinning atmosphere with an applied voltage of 20 kV, a distance of 20 cm between the spinning nozzle and the current collector, a discharge rate of 0.05 cc / g / hole per minute, a temperature of 30 °C, and a relative humidity of 60%, to obtain second fibers with an average fiber diameter of 300 nm (Figure 3). Then, a calendar process was performed using a roller heated to 150 °C on the accumulated second fibers to produce a fiber sheet with an average thickness of 20 μm and a basis weight of 40 g / m 2 in which the second fibers were thermally fused.

[0074] Thereafter, a meltblown nonwoven fabric with an average diameter of 3 μm and made of the first fibers which were polypropylene as the base material layer 200, with an average thickness of 10 cm and a basis weight of 150 g / m 2 was prepared. The produced fiber sheet 100 and the base material layer 200 were mutually fixed by hot air using a non-load binder roll to produce a composite sound-absorbing material 1000 as shown in Figure 1. At this time, the binder was polyvinyl butyral (PVB), and the hot air temperature was 100 °C.

[0075]

[0076] <Examples 2 to 9 and Comparative Examples 1 to 4>

[0077] Although manufactured in the same manner as in Example 1, as shown in Tables 1 and 2 below, the average diameter of the first fibers of the base material layer 200 (the thickness was fixed), the thickness of the fiber sheet 100 (the basis weight per thickness was fixed), the presence or absence of inclusion of the base material layer 200 and the fiber sheet 100, etc. were changed to manufacture sound-absorbing materials.

[0078]

[0079] <Experimental Example>

[0080] The following physical properties of the sound-absorbing materials manufactured according to the examples and comparative examples were evaluated and shown in Tables 1 and 2 respectively.

[0081] 1. Evaluation of heat insulation

[0082] For each of the sound-absorbing materials manufactured in the examples and comparative examples, after measuring the reflectance in the near-infrared (780 - 2500 nm) region using UV-Vis-NIR Spectroscopy, heat insulation was evaluated by measuring the average blocking rate in the near-infrared (780 - 2500 nm) region.

[0083] 2. Evaluation of Sound Absorption Characteristics by Frequency

[0084] For each of the sound-absorbing materials manufactured in the examples and comparative examples, the sound absorption coefficient was calculated by the following formula at frequencies of 200 Hz, 1000 Hz, 2000 Hz, 8000 Hz, and 10000 Hz according to the KS F 2814 method, and the sound absorption characteristics by frequency were evaluated.

[0085] [Calculation formula]

[0086] Sound absorption coefficient = (Intensity of incident sound - Intensity of reflected sound) / Intensity of incident sound

[0087] 3. Evaluation of Light Weight

[0088] For each of the sound-absorbing materials manufactured in the examples and comparative examples, after measuring the weight of each sound-absorbing material, the light weight was evaluated by measuring the weights of the sound-absorbing materials of the remaining examples and comparative examples with the weight of the sound-absorbing material of Example 1 as a reference of 100.

[0089] [Table 1]

[0090] [Table 2]

[0091] As can be seen from Table 1 and Table 2 above, Examples 1 to 5 that satisfy all of the average diameter of the first fiber of the base material layer, the thickness of the fiber sheet, the presence or absence of inclusion of the base material layer and the fiber sheet, etc. according to the present invention are Examples 6 to 9 and Comparative Examples 1 to 4 that do not satisfy even one of them. It was found that they are excellent in heat insulation and sound absorption performance, and at the same time, they are excellent in light weight.

[0092]

[0093] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the examples presented in this specification. Those skilled in the art who understand the present invention can easily propose other examples by adding, changing, deleting, adding, etc. of components within the same range, and this can also be said to be within the scope of the present invention.

[0094]

[0095] [National Research and Development Project that Supported the Present Invention]

[0096] [Problem Specific Number] 1425159097

[0097] [Problem Number] S2841718

[0098] [Department Name] Small and Medium Venture Business Department

[0099] [Name of the Organization in Charge of Problem Management (Specialty)] Small and Medium Enterprise Technology Information Promotion Agency

[0100] [Research Project Name] Small and Medium Enterprise Technology Innovation and Development Project (Market Expansion Type)

[0101] [Research Problem Name] Development of Smart Mask Technology with Facial Forced Circulation Type Filter

[0102] [Contribution Rate] 1 / 1

[0103] [Name of the Organization that Completed the Problem] Amo Green Tech Co., Ltd.

[0104] [Research Period] June 1, 2020 to May 31, 2022

Claims

1. A base material layer composed of at least one or more first fibers, and a fiber sheet composed of at least one or more second fibers and disposed on at least one surface of the base material layer, The base material layer and the fiber sheet satisfy the following condition (1), a composite sound absorbing material. 【Number 1】 At this time, the a is the average diameter (μm) of the first fibers of the base material layer, and the b is the thickness (μm) of the fiber sheet.

2. The base material layer and the fiber sheet satisfy the following condition (1), the composite sound absorbing material according to claim 1. 【Number 2】 At this time, the a is the average diameter (μm) of the first fibers of the base material layer, and the b is the thickness (μm) of the fiber sheet.

3. The first fibers have an average diameter of 0.5 to 10 μm, The base material layer has an average thickness of 10 to 3,000 mm, the composite sound absorbing material according to claim 1.

4. The second fibers have an average diameter of 100 nm to less than 1,000 nm, The fiber sheet has an average thickness of 10 to 200 μm, the composite sound absorbing material according to claim 1.

5. At least a part of the fiber sheet is fused and fixed to at least one surface of the base material layer, the composite sound absorbing material according to claim 1.

6. A binder layer interposed between the base material layer and the fiber sheet; further included, the composite sound absorbing material according to claim 1.

7. The fiber sheet is disposed on both surfaces of the base material layer, the composite sound absorbing material according to claim 1.

8. The first fibers include at least one or more selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polylactic acid, polyurethane, and nylon 6,6, The base material layer includes one or more of melt-blown nonwoven fabric and spunlace nonwoven fabric, the composite sound absorbing material according to claim 1.

9. The second fibers include at least one or more selected from the group consisting of polyvinylidene fluoride, nylon 6,6, polyacrylonitrile, polystyrene, polyurethane, polysulfone, polyvinyl alcohol, polyvinylidene fluoride, polyvinyl butyral, and polylactic acid, The fiber sheet is formed by accumulating predetermined fibers, the composite sound absorbing material according to claim 1.

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